Blame for tasks/lowes/tests/oracle-runtime/clone/app.py

"""Source-grounded Lowe's offline clone frontend shell.

The visual states and local image assets are derived from the Playwright
evidence pack in materials/lowes/source-current and source-assets.
"""

from __future__ import annotations

import json
from html import escape
from pathlib import Path
from typing import Any, Mapping, Sequence
from urllib.parse import parse_qs, quote_plus, urlencode

from fastapi import FastAPI, Request, Response
from fastapi.responses import HTMLResponse, JSONResponse, RedirectResponse
from fastapi.staticfiles import StaticFiles

import commerce
import landing
from backend import accounts as account_backend
from backend import store as site_store
from ui.artwork import VIEWS, product_svg


SITE_ID = "lowes"
DISPLAY_NAME = "Lowe's"
ROOT = Path(__file__).resolve().parent
MATERIAL_ROOT = ROOT.parent
STATIC_ROOT = ROOT / "static"
ASSET_ROOT = MATERIAL_ROOT / "source-assets" / "playwright-20260821"
MULTIPAGE_ASSET_ROOT = STATIC_ROOT / "assets" / "playwright-multipage-20260821"

app = FastAPI(title=DISPLAY_NAME)
app.mount("/static", StaticFiles(directory=STATIC_ROOT), name="static")
app.mount("/source-assets", StaticFiles(directory=ASSET_ROOT), name="source-assets")
app.mount(
    "/multipage-assets",
    StaticFiles(directory=MULTIPAGE_ASSET_ROOT),
    name="multipage-assets",
)


PRODUCTS = [
    {
        "backend_id": 1001,
        "slug": "frigidaire-professional-french-door-refrigerator",
        "brand": "Frigidaire Professional",
        "title": "21.4-cu ft Counter-Depth French Door Refrigerator with Dual Ice Maker",
        "price": 2999.00,
        "was": 3999.00,
        "rating": "4.6",
        "reviews": 812,
        "image": "005-753ec6507385a84d.avif",
        "category": "Appliances",
    },
    {
        "backend_id": 1002,
        "slug": "frigidaire-professional-convection-range",
        "brand": "Frigidaire Professional",
        "title": "30-in 6-Burner Convection Range with Air Fry",
        "price": 1699.00,
        "was": 2999.00,
        "rating": "4.7",
        "reviews": 441,
        "image": "005-289c2ff5d6cb25ae.avif",
        "category": "Appliances",
    },
    {
        "backend_id": 1005,
        "slug": "frigidaire-gallery-french-door-refrigerator",
        "brand": "Frigidaire Gallery",
        "title": "French Door Refrigerator with Custom-Flex Temp Drawer",
        "price": 1999.00,
        "was": 2799.00,
        "rating": "4.5",
        "reviews": 668,
        "image": "005-dfaf191432b00001.avif",
        "category": "Appliances",
    },
    {
        "backend_id": 1006,
        "slug": "frigidaire-energy-star-refrigerator",
        "brand": "Frigidaire",
        "title": "ENERGY STAR French Door Refrigerator with Ice Maker",
        "price": 1599.00,
        "was": 2399.00,
        "rating": "4.4",
        "reviews": 503,
        "image": "009-82acfde0786311c2.avif",
        "category": "Appliances",
    },
    {
        "backend_id": 1003,
        "slug": "frigidaire-dishwasher",
        "brand": "Frigidaire",
        "title": "Top Control 24-in Built-In Dishwasher",
        "price": 499.00,
        "was": 649.00,
        "rating": "4.3",
        "reviews": 1159,
        "image": "011-c6564a958b49fc75.avif",
        "category": "Appliances",
    },
    {
        "backend_id": 1004,
        "slug": "electrolux-front-load-laundry-pair",
        "brand": "Electrolux",
        "title": "Front-Load Washer and Electric Dryer Laundry Pair",
        "price": 1599.00,
        "was": 2199.00,
        "rating": "4.6",
        "reviews": 924,
        "image": "011-baeb3a51751a722c.avif",
        "category": "Appliances",
    },
]

BEST_SELLER_DEPARTMENTS = [
    ("Accessible Home", "6af8471da47c294fdc6c.webp"),
    ("Animal & Pet Care", "41a8e365a49148ee412e.webp"),
    ("Appliances", "ba41fa97d7383500c4b6.webp"),
    ("Automotive", "6c36e70a664e0848d90d.avif"),
    ("Bathroom", "dda585b6cae61ddd07ea.webp"),
    ("Building Supplies", "dd7f3b1d215945e9f098.avif"),
    ("Cleaning Supplies", "d2732d99a54a164ff9fe.webp"),
    ("Clothing & Work Apparel", "eed3b304716ed0e28843.webp"),
    ("Dining & Entertaining", "1c049e30d66740306d57.avif"),
    ("Drinks & Snacks", "a1a0b97fcf109d04fd4a.webp"),
    ("Electrical", "1e30e7d63a3040a0bf02.webp"),
    ("Flooring", "3f72678a92b47aca55df.webp"),
]

STATES = {
    "A": ["Alabama", "Alaska", "Arizona", "Arkansas"],
    "C": ["California", "Colorado", "Connecticut"],
    "D": ["Delaware", "District Of Columbia"],
    "F": ["Florida"],
    "G": ["Georgia"],
    "H": ["Hawaii"],
    "I": ["Idaho", "Illinois", "Indiana", "Iowa"],
    "K": ["Kansas", "Kentucky"],
    "L": ["Louisiana"],
    "M": ["Maine", "Maryland", "Massachusetts", "Michigan", "Minnesota", "Mississippi", "Missouri", "Montana"],
    "N": ["Nebraska", "Nevada", "New Hampshire", "New Jersey", "New Mexico", "New York", "North Carolina", "North Dakota"],
    "O": ["Ohio", "Oklahoma", "Oregon"],
    "P": ["Pennsylvania"],
    "R": ["Rhode Island"],
    "S": ["South Carolina", "South Dakota"],
    "T": ["Tennessee", "Texas"],
    "U": ["Utah"],
    "V": ["Vermont", "Virginia"],
    "W": ["Washington", "West Virginia", "Wisconsin", "Wyoming"],
}

# Routes that predate the source-path inventory and are still reachable from
# bookmarks. Each one now names the source-compatible path it belongs to, so the
# clone has a single canonical URL per surface instead of two parallel ones.
LEGACY_REDIRECTS = {
    "credit": "/l/Credit",
    "pro": "/l/Pro",
    "ai-assist": "/ai",
    "installations": "/l/install",
    "ideas": "/diy-projects-and-ideas",
    "maintenance": "/l/shop/home-maintenance",
    "terms": "/l/about/terms-and-conditions-of-use",
    "privacy": "/l/about/privacy-and-security-statement",
    "info": "/l/help",
}

# The Playwright probe recorded Access Denied for most source paths, so pages
# reconstructed from a URL alone say so in one consistent sentence rather than
# implying a verified reproduction.
SOURCE_RESTRICTED_NOTE = landing.SOURCE_RESTRICTED_NOTE

SYNTHETIC_COMMERCE_NOTE = (
    "Prices, ratings, reviews, specifications and artwork on this page come "
    "from this clone's frozen synthetic catalog, not from Lowe's. The source "
    "page answered Access Denied to the recorded Playwright session, so no "
    "source layout or product data was observed for it."
)

EMPTY_CART: dict[str, Any] = {
    "items": [],
    "count": 0,
    "units": 0,
    "subtotal_cents": 0,
    "savings_cents": 0,
    "needs_delivery": False,
    "all_free_delivery": True,
}


def money(value: float) -> str:
    return f"${value:,.2f}"


def cents(value: int) -> str:
    return f"${site_store.money(int(value))}"


def product_by_slug(slug: str) -> dict[str, object] | None:
    return next((product for product in PRODUCTS if product["slug"] == slug), None)


CAPTURED_BY_BACKEND_ID = {int(item["backend_id"]): item for item in PRODUCTS}


def captured_product(product_id: int) -> dict[str, object] | None:
    """The captured-asset display record for a backend id, when there is one."""

    return CAPTURED_BY_BACKEND_ID.get(int(product_id))


def catalog_art(product_id: int, view: str = "front") -> str:
    """Locally generated artwork URL for any catalog product."""

    return f"/img/p/{int(product_id)}/{view}.svg"


# ---------------------------------------------------------------------------
# shared page furniture
# ---------------------------------------------------------------------------


def breadcrumb_bar(trail: Sequence[tuple[str, str | None]]) -> str:
    parts = []
    for label, href in trail:
        if href:
            parts.append(f'<a href="{escape(href, quote=True)}">{escape(label)}</a>')
        else:
            parts.append(f"<span>{escape(label)}</span>")
    return (
        '<nav class="breadcrumbs" aria-label="Breadcrumb">'
        + " / ".join(parts)
        + "</nav>"
    )


def sandbox_notice(text: str) -> str:
    return f'<p class="notice notice--sandbox">{escape(text)}</p>'


def action_row(actions: Sequence[tuple[str, str]]) -> str:
    if not actions:
        return ""
    links = "".join(
        f'<a href="{escape(href, quote=True)}">{escape(label)}</a>'
        for label, href in actions
    )
    return f'<div class="category-links">{links}</div>'


def highlight_grid(highlights: Sequence[tuple[str, str]]) -> str:
    if not highlights:
        return ""
    cards = "".join(
        f"<article class=\"service-card\"><h3>{escape(title)}</h3><p>{escape(copy)}</p></article>"
        for title, copy in highlights
    )
    return f'<div class="service-grid">{cards}</div>'


def fact_table(facts: Sequence[tuple[str, str]]) -> str:
    if not facts:
        return ""
    rows = "".join(
        f'<tr><th scope="row">{escape(term)}</th><td>{escape(value)}</td></tr>'
        for term, value in facts
    )
    return f'<table class="spec-table"><tbody>{rows}</tbody></table>'


def rating_line(product: Mapping[str, Any]) -> str:
    filled = int(float(product["rating"]) + 0.5)
    stars = "★" * filled + "☆" * (5 - filled)
    return (
        f'<div class="rating"><span class="rating__stars">{stars}</span> '
        f'{float(product["rating"]):.1f} ({int(product["review_count"]):,})</div>'
    )


def price_line(product: Mapping[str, Any]) -> str:
    price = int(product["price_cents"])
    was = product.get("was_cents")
    extra = ""
    if was:
        extra = (
            f'<span class="price__was">Was {cents(int(was))}</span>'
            f'<span class="price__save">Save {cents(int(was) - price)}</span>'
        )
    return f'<div class="price"><span class="price__amount">{cents(price)}</span>{extra}</div>'


def catalog_card(product: Mapping[str, Any]) -> str:
    """A product tile for the synthetic catalog, using locally drawn artwork."""

    flag = ""
    if product.get("badge"):
        flag = (
            '<span class="product-card__flag"></span>'
            f'<span class="product-card__flag-text">{escape(str(product["badge"]))}</span>'
        )
    url = escape(str(product["url"]), quote=True)
    return f"""
    <article class="product-card">{flag}
      <a class="product-card__media" href="{url}"><img src="{catalog_art(int(product['id']))}" width="320" height="320" loading="lazy" alt="{escape(str(product['title']), quote=True)}"></a>
      <div class="product-card__body"><span class="product-card__brand">{escape(str(product['brand']))}</span>
        <a class="product-card__title" href="{url}">{escape(str(product['title']))}</a>
        {rating_line(product)}{price_line(product)}
        <form action="/cart/add" method="post"><input type="hidden" name="product_id" value="{int(product['id'])}"><button class="button button--primary button--block" type="submit">Add to Cart</button></form>
      </div>
    </article>"""


def catalog_grid(products: Sequence[Mapping[str, Any]]) -> str:
    if not products:
        return (
            '<div class="empty-state"><h2>No matching items</h2>'
            "<p>Clear a filter or widen the price range to see this clone's "
            "catalog again.</p></div>"
        )
    return '<div class="card-grid">' + "".join(catalog_card(row) for row in products) + "</div>"


def auth_services():
    return site_store.services()[1]


def site_backend():
    return site_store.services()[0]


# The session cookie is not named here: ``backend/runtime.json`` derives it from
# the site id and the vendored runtime returns the mandated Host-only options
# (``__Host-`` prefix, Secure, HttpOnly, SameSite, Path=/, never a Domain).
def session_cookie_spec() -> dict[str, Any]:
    return dict(site_backend().session_cookie)


def session_cookie_name() -> str:
    return str(session_cookie_spec()["name"])


def read_session_token(request: Request) -> str | None:
    return request.cookies.get(session_cookie_name())


def set_session_cookie(response: Response, token: str) -> Response:
    options = session_cookie_spec()
    name = str(options.pop("name"))
    response.set_cookie(name, token, **options)
    return response


def clear_session_cookie(response: Response) -> Response:
    options = session_cookie_spec()
    name = str(options.pop("name"))
    response.delete_cookie(name, path=str(options.get("path", "/")))
    return response


def existing_owner(request: Request) -> str | None:
    token = read_session_token(request)
    if not token:
        return None
    try:
        return auth_services().session_owner_digest(token)
    except Exception:
        return None


def ensured_owner(request: Request) -> tuple[str, str]:
    token, _session = auth_services().ensure_session(read_session_token(request))
    return token, auth_services().session_owner_digest(token)


def current_session(request: Request) -> dict[str, Any] | None:
    try:
        return auth_services().resolve_session(read_session_token(request))
    except Exception:
        return None


def current_account(request: Request) -> dict[str, Any] | None:
    return account_backend.public_account(current_session(request))


def current_account_id(request: Request) -> str | None:
    session = current_session(request)
    if not session or not session.get("authenticated"):
        return None
    return str(session["account"]["account_id"])


def cart_units_for_token(token: str) -> int:
    """Cart size for an explicit token, used after a session rotation.

    The request cookie still holds the revoked token on the response that
    performs the rotation, so the shell has to be counted from the new one.
    """

    try:
        owner = auth_services().session_owner_digest(token)
    except Exception:
        return 0
    return int(site_store.cart_units(owner))


def cart_for(request: Request) -> tuple[str | None, dict[str, Any]]:
    """The session's cart exactly as the backend holds it.

    The shell reads this on every render, so it has to cover the whole catalog
    rather than only the six captured-asset products: a line added from a
    ``/pd/`` page must count in the masthead and appear on ``/cart``.
    """

    owner = existing_owner(request)
    if owner is None:
        return None, dict(EMPTY_CART)
    return owner, site_store.get_cart(owner)


def icon(name: str) -> str:
    icons = {
        "search": "⌕",
        "store": "▣",
        "account": "◉",
        "cart": "🛒",
        "ai": "✦",
        "close": "×",
        "menu": "☰",
    }
    return f'<span aria-hidden="true" class="ui-icon">{icons.get(name, "•")}</span>'


def account_utility(account: dict[str, Any] | None) -> str:
    """The masthead account control, truthful about the current session."""

    if not account:
        label = "Sign In"
    else:
        first = str(account.get("display_name", "")).split(" ")[0] or "Account"
        label = f"Hi, {first[:14]}"
    return (
        f'<button class="utility" type="button" data-account-open>{icon("account")}'
        f"<span>{escape(label)}</span></button>"
    )


CATNAV_ITEMS = (
    ("▦ Shop All", "/c/Departments", (("Appliances", "/c/Appliances"), ("Bathroom", "/c/Bathroom"), ("Building Supplies", "/c/Building-supplies"), ("Doors & Windows", "/c/Windows-doors"))),
    ("♙ Installations", "/l/install", (("Installation Services", "/l/install"), ("Store Services", "/l/about/store-services"), ("Bathroom Installation", "/c/Bathroom"), ("Appliance Installation", "/c/Appliances"))),
    ("◇ Deals", "/l/savings", (("Daily Deals", "/l/savings/daily-deals"), ("Coupons", "/l/savings/coupons"), ("All Deals", "/pl/Deals/1611079983848"), ("Rebate Center", "/l/help/rebate-center"))),
    ("♧ Design & Ideas", "/diy-projects-and-ideas", (("DIY Projects & Ideas", "/diy-projects-and-ideas"), ("Workshops", "/diy-projects-and-ideas/workshops"), ("Fresh Inspiration", "/l/fresh-projects-and-inspiration"), ("Paint Ideas", "/c/Paint"))),
    ("$99 Maintenance", "/l/shop/home-maintenance", (("Home Maintenance", "/l/shop/home-maintenance"), ("Seasonal Projects", "/diy-projects-and-ideas"), ("Services", "/l/about/store-services"))),
    ("Appliances", "/c/Appliances", (("Refrigerators", "/c/Refrigerators"), ("Ranges", "/c/Ranges"), ("Dishwashers", "/c/Dishwashers"), ("Washers & Dryers", "/c/Washers-dryers"))),
    ("Bathroom", "/c/Bathroom", (("Bathroom Vanities", "/c/Bathroom-vanities"), ("Toilets", "/c/Toilets"), ("Showers", "/c/Showers"), ("Bathroom Faucets", "/c/Bathroom-faucets"))),
    ("Building Supplies", "/c/Building-supplies", (("Lumber", "/c/Lumber"), ("Decking", "/c/Decking"), ("Concrete & Masonry", "/c/Concrete-masonry"), ("Roofing", "/c/Roofing"), ("Insulation", "/c/Insulation"), ("Drywall", "/c/Drywall"))),
    ("Doors & Windows", "/c/Windows-doors", (("Exterior Doors", "/c/Exterior-doors"), ("Interior Doors", "/c/Interior-doors"), ("Windows", "/c/Windows"), ("Garage Doors", "/c/Garage-doors"))),
)


def catnav() -> str:
    items = []
    for index, (label, href, children) in enumerate(CATNAV_ITEMS):
        strong = " catnav__link--strong" if index < 4 else ""
        badge = ' <span class="badge-new">New</span>' if label == "$99 Maintenance" else ""
        child_links = "".join(
            f'<a href="{child_href}">{escape(child_label)}</a>'
            for child_label, child_href in children
        )
        items.append(
            '<li class="catnav__item"><details data-catnav-menu>'
            f'<summary class="catnav__link{strong}">{escape(label)}{badge}</summary>'
            f'<div class="catnav__menu"><strong>{escape(label.lstrip("▦♙◇♧ "))}</strong>'
            f'{child_links}<a class="catnav__all" href="{href}">View all →</a></div>'
            "</details></li>"
        )
    return '<nav class="catnav" aria-label="Primary"><ul class="shell catnav__list">' + "".join(items) + "</ul></nav>"


def header(
    cart_count: int = 0, query: str = "", account: dict[str, Any] | None = None
) -> str:
    q = escape(query, quote=True)
    return f"""
    <div class="promo-strip"><div class="shell">
      <span class="promo-strip__deal">Shop this week’s top deals now. &gt;</span>
      <ul class="promo-strip__links"><li><a href="/l/Credit">Lowe's Credit Center</a></li><li><a href="/mylowes/orders">Order Status</a></li><li><a href="/weekly-ad">Weekly Ad</a></li><li><a href="/l/Pro">Lowe's PRO</a></li></ul>
    </div></div>
    <header class="masthead"><div class="shell masthead__row">
      <button class="header-menu" type="button" aria-label="Open menu">{icon('menu')}</button>
      <a class="brand-logo lowes-wordmark" href="/" aria-label="Lowe's home"><span>LOWE'S</span></a>
      <div class="locator"><button class="locator__button" type="button">{icon('store')} <strong>Find a Store Near Me</strong>⌄</button></div>
      <div class="searchbar">
        <form class="searchbar__form" action="/search" method="get" data-suggest-form>
          {icon('search')}<input class="searchbar__input" name="q" value="{q}" placeholder="What can we help you find?" autocomplete="off" data-suggest-input aria-expanded="false">
          <button class="icon-button" type="submit" aria-label="Search">⌕</button>
        </form><div class="suggestions" data-suggest-panel hidden></div>
      </div>
      <nav class="masthead__utilities" aria-label="Utilities">
        <a class="utility utility-ai" href="/ai">{icon('ai')}<span>AI Assist</span></a>
        {account_utility(account)}
        <a class="utility utility--cart" href="/cart">{icon('cart')}<span>Cart</span>{f'<b class="utility__count">{cart_count}</b>' if cart_count else ''}</a>
      </nav>
    </div></header>
    {catnav()}<div class="mobile-locator"><button type="button">{icon('store')} Find a Store Near Me⌄</button></div>
    """


DRAWER_BENEFITS = (
    '<ul class="drawer__benefits"><li>▣ <a href="/orders">Order Status</a></li>'
    '<li>⚒ <a href="/l/install">Projects &amp; Installations</a></li>'
    '<li>♡ <a href="/lists">Lists</a></li>'
    '<li>♟ <a href="/l/about/honor-our-military">Military Discount</a></li>'
    '<li>✱ <a href="/l/about/mylowes-rewards">MyLowe\'s Rewards Benefits</a></li></ul>'
)


def drawer(opened: bool = False, account: dict[str, Any] | None = None) -> str:
    hidden = "hidden" if not opened else ""
    state = "open" if opened else "closed"
    if account:
        title = "Your Account"
        contents = f"""
      <p class="drawer__intro">Signed in as <strong>{escape(str(account.get('contact_display', '')))}</strong> in this offline clone. Nothing here exists at Lowe's.</p>
      <form action="/account/signout" method="post">
        <button class="button button--primary button--block" type="submit">Sign Out</button>
      </form>
      <p class="drawer__legal">Signing out revokes this local session on the server before the cookie is deleted.</p>
      {DRAWER_BENEFITS}"""
    else:
        title = "Sign In or Create Account"
        contents = f"""
      <p class="drawer__intro">Enter your <strong>email or phone number</strong> to get started. We'll check if you have an account.</p>
      <form action="/account/start" method="post">
        <label class="field"><span class="visually-hidden">Email or Phone Number</span><input class="field__control" name="identifier" placeholder="Email or Phone Number" required></label>
        <label class="checkbox"><input type="checkbox" checked name="remember"> Remember me on this device ⓘ</label>
        <button class="button button--primary button--block" type="submit">Continue</button>
      </form>
      <p class="drawer__legal"><a href="/account/reset">Forgot your password?</a></p>
      <p class="drawer__legal">By signing in, you're agreeing to our <a href="/l/about/terms-and-conditions-of-use">Terms of Use</a>, <a href="/l/about/privacy-and-security-statement">Privacy Statement</a>, and local clone terms.</p>
      {DRAWER_BENEFITS}"""
    return f"""
    <div class="drawer-overlay" data-account-overlay {hidden}></div>
    <aside class="drawer" data-account-drawer="{state}" {hidden} aria-label="{escape(title, quote=True)}">
      <div class="drawer__head"><h2 class="drawer__title">{escape(title)}</h2><button class="icon-button" data-account-close aria-label="Close">{icon('close')}</button></div>{contents}
    </aside>
    """


# Every footer destination is a source-compatible path this clone serves, so no
# footer control leaves the origin or lands on a shared filler page.
FOOTER_GROUPS: dict[str, tuple[tuple[str, str], ...]] = {
    "Customer Service": (
        ("Customer Service", "/l/help"),
        ("Order Status", "/mylowes/orders/checkorderstatus"),
        ("Returns Policy", "/l/help/returns-policy"),
        ("Shipping & Delivery", "/l/help/shipping-delivery"),
        ("Special Orders", "/l/help/special-orders"),
    ),
    "Resources": (
        ("Weekly Ad", "/weekly-ad"),
        ("Store Directory", "/Lowes-Stores"),
        ("DIY Projects & Ideas", "/diy-projects-and-ideas"),
        ("Lowe's Gift Cards", "/l/shop/gift-cards"),
        ("Subscriptions", "/subscriptions"),
    ),
    "About Lowe's": (
        ("How We Help", "/l/about/how-we-help"),
        ("MyLowe's Rewards", "/l/about/mylowes-rewards"),
        ("Lowe's Marketplace", "/l/about/lowes-marketplace"),
        ("Suppliers", "/l/about/suppliers"),
        ("Privacy & Security", "/l/about/privacy-and-security-statement"),
        ("Terms & Conditions of Use", "/l/about/terms-and-conditions-of-use"),
    ),
    "For Pros": (
        ("Lowe's for Pros", "/l/Pro"),
        ("Pro Benefits", "/l/Pro/pro-benefits"),
        ("Resources for Pros", "/l/Pro/resources-for-pros"),
        ("Pro Credit", "/l/Credit"),
        ("Tool Rental", "/l/shop/rental"),
    ),
}


def footer() -> str:
    columns = "".join(
        f"<section><h3>{escape(title)}</h3><ul>"
        + "".join(
            f'<li><a href="{escape(href, quote=True)}">{escape(label)}</a></li>'
            for label, href in items
        )
        + "</ul></section>"
        for title, items in FOOTER_GROUPS.items()
    )
    return f'<footer class="site-footer"><div class="shell"><div class="footer-grid">{columns}</div><p class="footer-note">Offline WebsiteBench clone for evaluation. No real Lowe\'s account, payment, fulfillment, message, or order is created.</p></div></footer>'


def product_card(product: dict[str, object]) -> str:
    price = float(product["price"])
    was = float(product["was"])
    return f"""
    <article class="product-card">
      <span class="product-card__flag"></span><span class="product-card__flag-text">SALE</span>
      <a class="product-card__media" href="/product/{product['slug']}"><img src="/static/assets/playwright-20260821/{product['image']}" alt="{escape(str(product['title']), quote=True)}"></a>
      <div class="product-card__body"><span class="product-card__brand">{escape(str(product['brand']))}</span>
        <a class="product-card__title" href="/product/{product['slug']}">{escape(str(product['title']))}</a>
        <div class="rating"><span class="rating__stars">★★★★★</span> {product['rating']} ({product['reviews']})</div>
        <div class="price"><span class="price__amount">{money(price)}</span><span class="price__was">Was {money(was)}</span><span class="price__save">Save {money(was-price)}</span></div>
        <form action="/cart/add" method="post"><input type="hidden" name="slug" value="{product['slug']}"><button class="button button--primary button--block" type="submit">Add to Cart</button></form>
      </div>
    </article>"""


def document(title: str, body: str, cart_count: int = 0, query: str = "", account_open: bool = False, account: dict[str, Any] | None = None) -> str:
    return f"""<!doctype html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><title>{escape(title)}</title><link rel="icon" href="/static/site/img/lowes-logo.svg" type="image/svg+xml"><link rel="stylesheet" href="/static/site/lowes.css"><link rel="stylesheet" href="/static/site/overrides.css"></head><body>{header(cart_count, query, account)}{body}{footer()}{drawer(account_open, account)}<script src="/static/site/lowes.js" defer></script></body></html>"""


def render(
    request: Request,
    title: str,
    body: str,
    *,
    query: str = "",
    account_open: bool = False,
    status_code: int = 200,
) -> HTMLResponse:
    """Render one page with the session-derived cart count and account state."""

    _owner, cart = cart_for(request)
    return HTMLResponse(
        document(
            title,
            body,
            int(cart["units"]),
            query,
            account_open,
            current_account(request),
        ),
        status_code=status_code,
    )


@app.get("/healthz")
def healthz() -> dict[str, object]:
    return {"ok": True, "site_id": SITE_ID}


@app.get("/", response_class=HTMLResponse)
def home(request: Request, account: str = "") -> HTMLResponse:
    cards = "".join(product_card(product) for product in PRODUCTS[:4])
    body = f"""
    <main><section class="section shell recommendation"><div class="section__head"><h2 class="section__title">Recommended searches</h2></div><div class="chip-row">
      <a class="chip" href="/search?q=cordless+drill">Cordless drills</a><a class="chip" href="/search?q=refrigerator">Refrigerators</a><a class="chip" href="/search?q=patio">Patio furniture</a><a class="chip" href="/search?q=paint">Interior paint</a><a class="chip" href="/search?q=grill">Grills</a>
    </div></section>
    <section class="shell hero-wrap"><div class="hero"><h1 class="hero__title">Electrolux End-of-Summer Sale</h1><div class="hero__brands">ELECTROLUX · FRIGIDAIRE · FRIGIDAIRE GALLERY · FRIGIDAIRE PROFESSIONAL</div><div class="playwright-hero"><img src="/static/assets/playwright-20260821/004-a219863c39ce7ce3.webp" alt="Save up to $300 when you bundle select Frigidaire major appliances"></div><div class="members"><strong>myLowe's Rewards — Members Get More</strong><span>FREE Delivery and Haul Away</span><span>FREE Basic Installation and Installation Parts</span><span>2-Year Lowe's Protection Plan</span></div></div></section>
    <section class="section shell"><div class="section__head"><h2 class="section__title">Featured appliance deals</h2><a class="section__more" href="/search?q=appliances">Shop all deals</a></div><div class="card-grid">{cards}</div></section>
    <section class="section shell"><div class="section__head"><h2 class="section__title">Services for every project</h2></div><div class="service-grid"><article class="service-card"><h3>Installation Services</h3><p>Get help from independent installers in this local demo flow.</p><a href="/installations">Explore installations</a></article><article class="service-card"><h3>Find a Store</h3><p>Select a synthetic store for pickup and local availability.</p><a href="/stores">Choose a store</a></article><article class="service-card"><h3>Lowe's for Pros</h3><p>Tools and savings represented as offline-only sample data.</p><a href="/pro">Explore Pro services</a></article></div></section>
    </main>"""
    return render(request, "Lowe’s Home Improvement", body, account_open=account == "open")


@app.get("/best-sellers", response_class=HTMLResponse)
def best_sellers(request: Request) -> HTMLResponse:
    sidebar = "".join(f'<li><a href="/c/{quote_plus(label.lower().replace(" & ", "-").replace(" ", "-"))}">{escape(label)}</a></li>' for label, _image in BEST_SELLER_DEPARTMENTS)
    cards = "".join(
        f'<a class="department-card" href="/c/{quote_plus(label.lower().replace(" & ", "-").replace(" ", "-"))}"><span class="department-card__image"><img src="/multipage-assets/{image}" alt=""></span><strong>{escape(label)}</strong></a>'
        for label, image in BEST_SELLER_DEPARTMENTS
    )
    body = f"""<main class="best-sellers-page">
      <section class="best-sellers-hero"><h1>Lowe’s Best Sellers</h1></section>
      <button class="mobile-departments" type="button">Departments <span>›</span></button>
      <div class="shell best-sellers-layout"><aside class="department-sidebar"><h2>All Departments</h2><ul>{sidebar}</ul></aside><section class="department-grid">{cards}<a class="button button--outline all-departments" href="/search">See All Departments</a></section></div>
    </main>"""
    return render(request, "Lowe's Best Sellers - The Most Popular Items on Lowes.com", body)


@app.get("/diy-projects-and-ideas/workshops", response_class=HTMLResponse)
def workshops(request: Request) -> HTMLResponse:
    body = """<main class="shell campaign-page">
      <div class="breadcrumbs"><a href="/">Home</a> / Workshops</div>
      <h1>Welcome to MyLowe’s Rewards™ Kids Club!</h1>
      <img class="campaign-wide" src="/multipage-assets/6413d48a98ac64be263b.webp" alt="Kids Club — your next family adventure starts here">
      <a href="/?account=open"><img class="campaign-wide campaign-strip" src="/multipage-assets/c1a3471e45fbf690307d.avif" alt="Create your Kids Profile and sign up for workshops"></a>
      <img class="campaign-wide" src="/multipage-assets/ebc23e062899cdd23b5a.avif" alt="Build, laugh and learn at a free workshop">
      <section class="campaign-copy"><h2>Free workshops and family fun</h2><p>MyLowe’s Rewards members can create a kids profile, collect digital badges and register for hands-on family workshops in this local demo.</p><a class="button button--primary" href="/?account=open">Get Started</a></section>
    </main>"""
    return render(request, "Lowe’s Kids Club: Free Workshops & Family Fun", body)


@app.get("/Lowes-Stores", response_class=HTMLResponse)
@app.get("/stores", response_class=HTMLResponse)
def stores_directory(request: Request) -> HTMLResponse:
    groups = "".join(
        f'<section class="state-group"><h2>{letter}</h2>{"".join(f"<a href=/stores/{quote_plus(state.lower().replace(chr(32), chr(45)))}>{escape(state)}</a>" for state in states)}</section>'
        for letter, states in STATES.items()
    )
    body = f"""<main class="shell stores-page"><div class="breadcrumbs"><a href="/stores">Find a Store</a> / Store Directory</div><h1>State Directory</h1><p>Lowe's Stores in the U.S.</p><div class="states-grid">{groups}</div></main>"""
    return render(request, "Lowe's Store Directory - Find Locations by State and City", body)


@app.get("/stores/{state}", response_class=HTMLResponse)
def stores_in_state(request: Request, state: str) -> HTMLResponse:
    label = state.replace("-", " ").title()
    body = f'<main class="shell section"><div class="breadcrumbs"><a href="/Lowes-Stores">Store Directory</a> / {escape(label)}</div><h1>Lowe\'s Stores in {escape(label)}</h1><div class="store-results"><article class="service-card"><h2>{escape(label)} Lowe\'s</h2><p>Select a location in the header to see local pickup availability.</p><button class="button button--primary" type="button">Set as My Store</button></article></div></main>'
    return render(request, f"Lowe's Stores in {label}", body)


@app.get("/mylowes/orders", response_class=HTMLResponse)
def order_search(request: Request, result: str = "") -> HTMLResponse:
    result_box = '<div class="notice notice--sandbox">No matching local order was found. This form never contacts Lowe\'s.</div>' if result else ""
    body = f"""<main class="order-search-page"><div class="shell"><div class="breadcrumbs"><a href="/">Home</a> / Orders Search</div><section class="order-search-card"><h1>Check Order Status</h1><div class="order-tabs"><button class="active" type="button">Online Orders</button><button type="button">Store Purchases</button><button type="button">Projects</button></div><form action="/mylowes/orders" method="get"><label class="field"><span class="visually-hidden">Email address</span><input class="field__control" type="email" name="email" placeholder="✉  Enter email address" required><small>Please enter the email address used to place the order</small></label><label class="field"><span class="visually-hidden">Order Number</span><input class="field__control" name="order_number" placeholder="▧  Enter Order Number" required><small>Found in your Order confirmation email</small></label><input type="hidden" name="result" value="not-found"><button class="button button--primary button--block">Check Order Status</button></form>{result_box}<p class="order-account-copy"><a href="/?account=open">Sign up</a> for a free MyLowe's account to track your orders and enjoy all the benefits.</p><p>Already have a MyLowe's account? <a href="/?account=open">Sign In</a></p></section></div></main>"""
    return render(request, "Check Order Status", body)


@app.get("/subscriptions", response_class=HTMLResponse)
def subscriptions(request: Request) -> HTMLResponse:
    categories = [
        ("Air Filters", "b1b525b77407e16c4857.avif"),
        ("Cleaning Supplies", "f3a5af534697d6b76954.webp"),
        ("Hardware", "7679add5dce57126b778.webp"),
        ("Lawn Care", "dec89f8f5b922b47de43.webp"),
    ]
    tiles = "".join(f'<a class="subscription-tile" href="/search?q={quote_plus(label)}"><img src="/multipage-assets/{image}" alt=""><strong>{escape(label)}</strong></a>' for label, image in categories)
    body = f"""<main class="subscriptions-page"><section class="subscriptions-hero"><img src="/multipage-assets/1c329ae2e5024a0fc51d.png" alt="Woman changing an air filter"><div class="subscriptions-panel"><h1><span>SUBSCRIPTIONS</span><br>MADE SIMPLE</h1><ul><li>Free Standard Shipping</li><li>5% Off Select Items</li><li>Automatic Repeat Deliveries</li><li>Cancel Anytime</li></ul><a class="button button--primary button--block" href="#how-it-works">Learn More</a><a href="/terms">Terms &amp; Conditions</a></div></section><section id="how-it-works" class="section shell"><h2 class="center-title">How does it work?</h2><div class="subscription-steps"><article><b>1</b><h3>Find eligible products</h3><p>Shop items available for repeat delivery.</p></article><article><b>2</b><h3>Choose your schedule</h3><p>Select a delivery frequency that works for you.</p></article><article><b>3</b><h3>Save automatically</h3><p>Manage or cancel your local demo subscription anytime.</p></article></div><h2 class="center-title">Popular subscription categories</h2><div class="subscription-grid">{tiles}</div></section></main>"""
    return render(request, "Subscriptions | Lowe's", body)


@app.get("/c/{category_slug}", response_class=HTMLResponse)
def category_page(request: Request, category_slug: str) -> HTMLResponse:
    label = category_slug.replace("-", " ").title()
    cards = "".join(product_card(product) for product in PRODUCTS)
    child_map = {
        "appliances": ("Refrigerators", "Ranges", "Dishwashers", "Washers-dryers"),
        "bathroom": ("Bathroom-vanities", "Toilets", "Showers", "Bathroom-faucets"),
        "building-supplies": ("Lumber", "Decking", "Concrete-masonry", "Roofing", "Insulation", "Drywall"),
        "windows-doors": ("Exterior-doors", "Interior-doors", "Windows", "Garage-doors"),
    }
    children = child_map.get(category_slug.lower(), ())
    category_links = "".join(
        f'<a href="/c/{child}"><span class="category-link__art" aria-hidden="true">{escape(child[0])}</span>{escape(child.replace("-", " ").title())}</a>'
        for child in children
    )
    if not category_links:
        category_links = f'<a href="/best-sellers">Best Sellers</a><a href="/search?q={quote_plus(label)}">Shop All {escape(label)}</a><a href="/subscriptions">Subscriptions</a>'
    body = f'<main class="shell section category-page"><div class="breadcrumbs"><a href="/">Home</a> / {escape(label)}</div><h1>{escape(label)}</h1><div class="category-links">{category_links}</div><section class="section"><div class="section__head"><h2 class="section__title">Featured {escape(label)}</h2></div><div class="card-grid">{cards}</div></section></main>'
    return render(request, f"Shop {label} at Lowes.com", body)


@app.get("/api/suggest")
def suggest(q: str = "") -> JSONResponse:
    needle = q.strip().lower()
    labels = ["cordless drill", "refrigerator", "refrigerator water filter", "Frigidaire appliances", "dishwasher", "range", "washer and dryer"]
    matched = [label for label in labels if needle in label.lower()][:6]
    products = [{"label": p["title"], "href": f"/product/{p['slug']}"} for p in PRODUCTS if needle in str(p["title"]).lower()][:3]
    return JSONResponse({"groups": [{"label": "Search suggestions", "items": [{"label": label, "href": f"/search?q={quote_plus(label)}"} for label in matched]}, {"label": "Products", "items": products}]})


@app.get("/search", response_class=HTMLResponse)
def search(request: Request, q: str = "") -> HTMLResponse:
    needle = q.strip().lower()
    matches = PRODUCTS if not needle or needle in {"deals", "appliances"} else [p for p in PRODUCTS if needle in json.dumps(p).lower()]
    cards = "".join(product_card(product) for product in matches)
    body = f'<main class="shell section"><div class="breadcrumbs"><a href="/">Home</a> / Search</div><div class="results-head"><div><h1 class="page-title">{escape(q) if q else "Shop All"}</h1><span class="results-head__count">{len(matches)} results</span></div><select class="field__control sort-select" aria-label="Sort"><option>Sort by: Relevance</option><option>Price: Low to High</option><option>Top Rated</option></select></div>{f"<div class=card-grid>{cards}</div>" if cards else "<div class=empty-state><h2>No exact results</h2><p>Try appliances, refrigerator, dishwasher, or range.</p></div>"}</main>'
    return render(request, f"{q or 'Shop All'} | Lowe's", body, query=q)


@app.get("/product/{slug}", response_class=HTMLResponse)
def product(request: Request, slug: str) -> HTMLResponse:
    product = product_by_slug(slug)
    if not product:
        return render(request, "Product not found", '<main class="shell section empty-state"><h1>Product not found</h1><a href="/search">Continue shopping</a></main>', status_code=404)
    body = f"""<main class="shell section"><div class="breadcrumbs"><a href="/">Home</a> / <a href="/search?q=appliances">Appliances</a> / {escape(str(product['brand']))}</div><div class="pdp"><div class="pdp__thumbs"><button class="pdp__thumb"><img src="/static/assets/playwright-20260821/{product['image']}" alt=""></button></div><div class="pdp__stage"><img src="/static/assets/playwright-20260821/{product['image']}" alt="{escape(str(product['title']), quote=True)}"></div><section class="pdp__buybox"><span class="product-card__brand">{escape(str(product['brand']))}</span><h1 class="pdp__title">{escape(str(product['title']))}</h1><div class="rating"><span class="rating__stars">★★★★★</span> {product['rating']} ({product['reviews']})</div><div class="price"><span class="price__amount">{money(float(product['price']))}</span><span class="price__was">Was {money(float(product['was']))}</span></div><div class="fulfillment"><h2>How do you want to get your item?</h2><label class="fulfillment-choice"><input type="radio" checked name="fulfillment"> Pickup — Select a store</label><label class="fulfillment-choice"><input type="radio" name="fulfillment"> Delivery — Available</label></div><form action="/cart/add" method="post"><input type="hidden" name="slug" value="{product['slug']}"><button class="button button--primary button--block" type="submit">Add to Cart</button></form><p class="notice notice--sandbox">Local demo only. No real inventory, fulfillment, or charge.</p></section></div><section class="section"><h2>Product details</h2><table class="spec-table"><tr><th>Brand</th><td>{escape(str(product['brand']))}</td></tr><tr><th>Category</th><td>{escape(str(product['category']))}</td></tr><tr><th>Model</th><td>WB-{str(product['slug'])[:12].upper()}</td></tr></table></section></main>"""
    return render(request, f"{product['title']} | Lowe's", body)


def resolve_cart_products(values: Mapping[str, list[str]]) -> list[int]:
    """Backend product ids for an add-to-cart post.

    ``slug`` is the captured-asset form used by the home, search and
    ``/product/`` tiles; ``product_id`` is the catalog form used by every
    ``/pd/``, ``/pl/``, ``/collections/`` and ``/configure/`` control, and a
    package page posts it once per suite member.
    """

    ids = [
        int(raw.strip())
        for raw in values.get("product_id", [])
        if raw.strip().isdigit()
    ]
    if ids:
        return ids
    captured = product_by_slug(values.get("slug", [""])[0])
    return [int(captured["backend_id"])] if captured else []


def resolve_cart_product(values: Mapping[str, list[str]]) -> int | None:
    ids = resolve_cart_products(values)
    return ids[0] if ids else None


def local_next(values: Mapping[str, list[str]], fallback: str = "/cart") -> str:
    """A redirect target restricted to this origin's own absolute paths."""

    target = values.get("next", [""])[0]
    if target.startswith("/") and not target.startswith("//"):
        return target
    return fallback


@app.post("/cart/add")
async def add_to_cart(request: Request) -> RedirectResponse:
    values = parse_qs((await request.body()).decode("utf-8", "replace"))
    token, owner = ensured_owner(request)
    raw_quantity = values.get("quantity", ["1"])[0]
    quantity = int(raw_quantity) if raw_quantity.isdigit() else 1
    requested = values.get("fulfillment", ["pickup"])[0]
    fulfillment = requested if requested in site_store.FULFILLMENTS else "pickup"
    for product_id in resolve_cart_products(values):
        try:
            site_store.add_to_cart(
                owner,
                product_id=product_id,
                quantity=quantity,
                fulfillment=fulfillment,
            )
        except site_store.CheckoutError:
            # A pickup-ineligible item is the only expected rejection here; the
            # delivery line is still a real add rather than a silent no-op.
            site_store.add_to_cart(
                owner,
                product_id=product_id,
                quantity=quantity,
                fulfillment="delivery",
            )
    return set_session_cookie(
        RedirectResponse(local_next(values), status_code=303), token
    )


@app.post("/cart/update")
async def update_cart(request: Request) -> RedirectResponse:
    values = parse_qs((await request.body()).decode("utf-8", "replace"))
    action = values.get("action", [""])[0]
    token, owner = ensured_owner(request)
    backend_cart = site_store.get_cart(owner)

    raw_item = values.get("item_id", [""])[0].strip()
    if raw_item.isdigit():
        item = next(
            (row for row in backend_cart["items"] if int(row["item_id"]) == int(raw_item)),
            None,
        )
    else:
        product_id = resolve_cart_product(values)
        item = next(
            (
                row
                for row in backend_cart["items"]
                if product_id is not None and int(row["product_id"]) == product_id
            ),
            None,
        )
    if item:
        quantity = int(item["quantity"])
        if action == "remove":
            site_store.remove_cart_item(owner, item_id=int(item["item_id"]))
        elif action == "minus":
            site_store.update_cart_item(
                owner, item_id=int(item["item_id"]), quantity=quantity - 1
            )
        elif action == "plus":
            site_store.update_cart_item(
                owner, item_id=int(item["item_id"]), quantity=quantity + 1
            )
    return set_session_cookie(RedirectResponse("/cart", status_code=303), token)


def cart_line(item: Mapping[str, Any]) -> str:
    """One cart row, linking back to whichever page owns the item's display."""

    product_id = int(item["product_id"])
    captured = captured_product(product_id)
    if captured:
        href = f"/product/{captured['slug']}"
        art = f"/static/assets/playwright-20260821/{captured['image']}"
    else:
        href = str(item["url"])
        art = catalog_art(product_id)
    fulfillment = (
        "Store pickup" if item["fulfillment"] == "pickup" else "Delivery"
    )
    return (
        '<article class="cart-line">'
        f'<a class="cart-line__media" href="{escape(href, quote=True)}">'
        f'<img src="{art}" alt=""></a><div>'
        f'<span class="product-card__brand">{escape(str(item["brand"]))}</span>'
        f'<a class="product-card__title" href="{escape(href, quote=True)}">{escape(str(item["title"]))}</a>'
        f"<p>{fulfillment} in this local demo.</p>"
        '<form class="cart-line__actions" action="/cart/update" method="post">'
        f'<input type="hidden" name="item_id" value="{int(item["item_id"])}">'
        '<button name="action" value="minus">−</button>'
        f'<strong>{int(item["quantity"])}</strong>'
        '<button name="action" value="plus">+</button>'
        '<button class="link-button" name="action" value="remove">Remove</button>'
        "</form></div>"
        f'<strong>{cents(int(item["line_total_cents"]))}</strong></article>'
    )


@app.get("/cart", response_class=HTMLResponse)
def cart_page(request: Request) -> HTMLResponse:
    _owner, cart = cart_for(request)
    if not cart["items"]:
        body = '<main class="shell section empty-state"><h1>Your cart is empty</h1><p>Find everything you need for your next project.</p><a class="button button--primary" href="/search">Start shopping</a></main>'
        return render(request, "Cart | Lowe's", body)
    lines = "".join(cart_line(item) for item in cart["items"])
    savings = int(cart["savings_cents"])
    savings_row = (
        f'<div class="summary__row"><span>Savings</span><strong>-{cents(savings)}</strong></div>'
        if savings
        else ""
    )
    body = (
        '<main class="shell section">'
        f'<h1 class="page-title">Cart ({int(cart["units"])} items)</h1>'
        f'<div class="cart-layout"><section>{lines}</section>'
        '<aside class="summary"><h2>Order Summary</h2>'
        f'<div class="summary__row"><span>Subtotal</span><strong>{cents(int(cart["subtotal_cents"]))}</strong></div>'
        f"{savings_row}"
        '<div class="summary__row"><span>Estimated tax</span><span>Calculated at checkout</span></div>'
        f'<div class="summary__row summary__row--total"><span>Estimated total</span><strong>{cents(int(cart["subtotal_cents"]))}</strong></div>'
        '<a class="button button--primary button--block" href="/checkout">Checkout</a>'
        '<p class="notice notice--sandbox">All payments are local sandbox simulations.</p>'
        "</aside></div></main>"
    )
    return render(request, "Cart | Lowe's", body)


@app.get("/checkout", response_class=HTMLResponse)
def checkout(request: Request) -> HTMLResponse:
    owner = existing_owner(request)
    backend_cart = site_store.get_cart(owner) if owner else {"items": [], "subtotal_cents": 0, "savings_cents": 0, "all_free_delivery": True}
    totals = site_store.price_cart(backend_cart, fulfillment="pickup", state="NC")
    scenarios = site_store.payment_scenarios()
    options = "".join(f'<option value="{escape(item["id"], quote=True)}">{escape(item["display_label"])} — {escape(item["outcome"])}</option>' for item in scenarios)
    button_disabled = "disabled" if not backend_cart["items"] else ""
    body = f'<main class="shell section"><div class="breadcrumbs"><a href="/cart">Cart</a> / Checkout</div><h1 class="page-title">Checkout</h1><form class="checkout-layout" action="/checkout/place" method="post"><section><div class="notice notice--sandbox"><strong>WebsiteBench local sandbox</strong><br>No real Lowe\'s order or payment will be created.</div><h2>Contact information</h2><div class="card-grid card-grid--two"><label class="field"><span class="field__label">First name</span><input class="field__control" name="first_name" required value="Site"></label><label class="field"><span class="field__label">Last name</span><input class="field__control" name="last_name" required value="Tester"></label></div><label class="field"><span class="field__label">Email</span><input class="field__control" type="email" name="email" required value="annotator@example.test"></label><h2>Fulfillment</h2><label class="fulfillment-choice"><input type="radio" checked name="fulfillment" value="pickup"> Store pickup</label><input type="hidden" name="store_id" value="{escape(site_store.stores()[0]["id"], quote=True)}"><h2>Sandbox payment outcome</h2><label class="field"><span class="field__label">Scenario</span><select class="field__control" name="scenario_id">{options}</select></label></section><aside class="summary"><h2>Order summary</h2><div class="summary__row"><span>Subtotal</span><strong>${site_store.money(totals["subtotal_cents"])}</strong></div><div class="summary__row"><span>Estimated tax</span><strong>${site_store.money(totals["tax_cents"])}</strong></div><div class="summary__row summary__row--total"><span>Total</span><strong>${site_store.money(totals["total_cents"])}</strong></div><button class="button button--primary button--block" {button_disabled}>Place sandbox order</button><p>No card number, CVV, expiry, bank, or wallet information is accepted.</p></aside></form></main>'
    return render(request, "Checkout | Lowe's", body)


async def form_values(request: Request) -> dict[str, str]:
    body = (await request.body()).decode("utf-8", "replace")
    return {key: entries[0] for key, entries in parse_qs(body).items()}


@app.post("/account/start")
async def account_start(request: Request) -> HTMLResponse:
    values = parse_qs((await request.body()).decode("utf-8", "replace"))
    identifier_raw = values.get("identifier", [""])[0]
    token, _owner = ensured_owner(request)
    try:
        identified = account_backend.identify(auth_services(), identifier_raw)
    except Exception as exc:
        _field, message = account_backend.friendly_error(exc)
        return set_session_cookie(
            render(request, "Account | Lowe's", f'<main class="shell section"><div class="notice notice--error"><h1>Check your entry</h1><p>{escape(message)}</p><a class="button button--primary" href="/?account=open">Try again</a></div></main>', account_open=True),
            token,
        )
    identity = identified["identity"]
    if identified["account_exists"]:
        body = f'<main class="shell section"><h1>Welcome back</h1><form action="/account/signin" method="post"><input type="hidden" name="identifier" value="{escape(identifier_raw, quote=True)}"><label class="field"><span class="field__label">Password</span><input class="field__control" type="password" name="password" required></label><button class="button button--primary">Sign In</button></form><p><a href="/account/reset?identifier={quote_plus(identifier_raw)}">Forgot your password?</a></p></main>'
    else:
        phone_note = '<p class="notice notice--sandbox">Phone registration uses reserved test numbers only: 555-0100 through 555-0199, such as (213) 555-0142.</p>' if identity["kind"] == "phone" else ''
        body = f'<main class="shell section"><h1>Create your local account</h1>{phone_note}<p>Verification will go only to the local WebsiteBench outbox for <strong>{escape(identity["display"])}</strong>.</p><form action="/account/create" method="post"><input type="hidden" name="identifier" value="{escape(identifier_raw, quote=True)}"><div class="card-grid card-grid--two"><label class="field"><span class="field__label">First name</span><input class="field__control" name="first_name" required></label><label class="field"><span class="field__label">Last name</span><input class="field__control" name="last_name" required></label></div><label class="field"><span class="field__label">Password</span><input class="field__control" type="password" name="password" minlength="8" required></label><button class="button button--primary">Send local verification code</button></form></main>'
    return set_session_cookie(render(request, "Account | Lowe's", body), token)


@app.post("/account/create")
async def account_create(request: Request) -> HTMLResponse:
    values = parse_qs((await request.body()).decode("utf-8", "replace"))
    token, _owner = ensured_owner(request)
    try:
        result = account_backend.start_registration(auth_services(), token, identifier=values.get("identifier", [""])[0], first_name=values.get("first_name", [""])[0], last_name=values.get("last_name", [""])[0], password=values.get("password", [""])[0])
        code = account_backend.sandbox_code(auth_services(), token)
        help_box = f'<div class="notice notice--sandbox"><strong>Local sandbox code:</strong> <code>{escape(code or "unavailable")}</code><br>This value comes from the repository-approved local outbox and was not sent externally.</div>'
        body = f'<main class="shell section"><h1>Verify your contact</h1><p>Enter the local code for <strong>{escape(result["identity"]["display"])}</strong>.</p>{help_box}<form action="/account/verify" method="post"><label class="field"><span class="field__label">Verification code</span><input class="field__control" name="code" inputmode="numeric" required></label><button class="button button--primary">Verify and create account</button></form></main>'
    except Exception as exc:
        _field, message = account_backend.friendly_error(exc)
        body = f'<main class="shell section"><div class="notice notice--error"><h1>Could not start registration</h1><p>{escape(message)}</p><a class="button button--primary" href="/">Start again</a></div></main>'
    return set_session_cookie(render(request, "Verify account | Lowe's", body), token)


@app.post("/account/verify")
async def account_verify(request: Request) -> HTMLResponse:
    values = parse_qs((await request.body()).decode("utf-8", "replace"))
    token, _owner = ensured_owner(request)
    try:
        completed = account_backend.verify_and_complete(auth_services(), token, values.get("code", [""])[0])
        new_token = str(completed["session_token"])
        name = escape(str(completed["account"]["display_name"]))
        body = f'<main class="shell section"><div class="order-banner"><h1>Account created</h1><p>Welcome, {name}. Your account and contact verification exist only in this offline clone.</p><a class="button button--primary" href="/">Continue shopping</a></div></main>'
        # The account page must reflect the rotated session, not the anonymous
        # one the request arrived with, so the shell is rendered from the new
        # token rather than from ``request.cookies``.
        account = account_backend.public_account(auth_services().resolve_session(new_token))
        page = HTMLResponse(
            document(
                "Account created | Lowe's",
                body,
                cart_units_for_token(new_token),
                account=account,
            )
        )
        return set_session_cookie(page, new_token)
    except Exception as exc:
        _field, message = account_backend.friendly_error(exc)
        body = f'<main class="shell section"><div class="notice notice--error"><h1>Verification failed</h1><p>{escape(message)}</p><a href="/">Start again</a></div></main>'
        return set_session_cookie(
            render(request, "Verification failed | Lowe's", body), token
        )


@app.post("/account/signin")
async def account_signin(request: Request) -> HTMLResponse:
    values = parse_qs((await request.body()).decode("utf-8", "replace"))
    token, _owner = ensured_owner(request)
    try:
        signed = account_backend.sign_in(auth_services(), token, identifier=values.get("identifier", [""])[0], password=values.get("password", [""])[0])
        return set_session_cookie(
            RedirectResponse("/", status_code=303), str(signed["session_token"])
        )
    except Exception as exc:
        _field, message = account_backend.friendly_error(exc)
        return set_session_cookie(
            render(request, "Sign in | Lowe's", f'<main class="shell section"><div class="notice notice--error"><h1>Sign in failed</h1><p>{escape(message)}</p><a href="/">Try again</a></div></main>'),
            token,
        )


@app.post("/account/signout")
async def account_signout(request: Request) -> RedirectResponse:
    """Revoke the server-side session first, then drop the cookie.

    The anonymous cart is deliberately not migrated: the revoked session's
    owner digest keeps its rows, and the next request starts a fresh anonymous
    session, which is what a real sign-out looks like from the browser.
    """

    account_backend.sign_out(auth_services(), read_session_token(request))
    return clear_session_cookie(RedirectResponse("/", status_code=303))


# ---------------------------------------------------------------------------
# password recovery
# ---------------------------------------------------------------------------

RESET_STEP_INTRO = (
    "<p>Enter the email or reserved test phone number on your local account. "
    "This clone answers the same way whether or not an account exists.</p>"
)


def reset_request_form(identifier: str = "", notice: str = "") -> str:
    return (
        '<main class="shell section"><h1>Reset your password</h1>'
        f"{notice}{RESET_STEP_INTRO}"
        '<form action="/account/reset/start" method="post">'
        '<label class="field"><span class="field__label">Email or Phone Number</span>'
        '<input class="field__control" name="identifier" required '
        f'value="{escape(identifier, quote=True)}"></label>'
        '<button class="button button--primary">Send local reset code</button>'
        "</form></main>"
    )


@app.get("/account/reset", response_class=HTMLResponse)
def account_reset(request: Request, identifier: str = "") -> HTMLResponse:
    return render(request, "Reset your password | Lowe's", reset_request_form(identifier))


@app.post("/account/reset/start")
async def account_reset_start(request: Request) -> HTMLResponse:
    values = await form_values(request)
    identifier_raw = values.get("identifier", "")
    token, _owner = ensured_owner(request)
    try:
        result = account_backend.start_password_reset(
            auth_services(), token, identifier=identifier_raw
        )
    except Exception as exc:
        _field, message = account_backend.friendly_error(exc)
        notice = f'<div class="notice notice--error"><p>{escape(message)}</p></div>'
        return set_session_cookie(
            render(
                request,
                "Reset your password | Lowe's",
                reset_request_form(identifier_raw, notice),
                status_code=400,
            ),
            token,
        )
    # The store's public message is identical for a known and an unknown
    # identity. The sandbox block below is the one place they differ, and only
    # while the local development helper is on: with
    # ``LOWES_LOCAL_SANDBOX_HELP=0`` ``sandbox_code`` returns None for both and
    # the two responses become byte-identical.
    code = account_backend.sandbox_code(
        auth_services(), token, purpose=account_backend.PURPOSE_PASSWORD_RESET
    )
    help_box = (
        '<div class="notice notice--sandbox"><strong>Local sandbox code:</strong> '
        f'<code>{escape(code)}</code><br>This value comes from the local outbox '
        "and was not sent externally.</div>"
        if code
        else '<div class="notice notice--sandbox">No local sandbox code is '
        "available to display. Nothing was sent to any external service.</div>"
    )
    body = (
        '<main class="shell section"><h1>Check your local outbox</h1>'
        f'<p>{escape(str(result["flow"]["message"]))}</p>{help_box}'
        '<form action="/account/reset/verify" method="post">'
        '<label class="field"><span class="field__label">Verification code</span>'
        '<input class="field__control" name="code" inputmode="numeric" required>'
        "</label><button class=\"button button--primary\">Verify code</button>"
        "</form></main>"
    )
    return set_session_cookie(
        render(request, "Reset your password | Lowe's", body), token
    )


@app.post("/account/reset/verify")
async def account_reset_verify(request: Request) -> HTMLResponse:
    values = await form_values(request)
    token, _owner = ensured_owner(request)
    try:
        account_backend.verify_password_reset(
            auth_services(), token, values.get("code", "")
        )
    except Exception as exc:
        _field, message = account_backend.friendly_error(exc)
        body = (
            '<main class="shell section"><div class="notice notice--error">'
            f"<h1>Verification failed</h1><p>{escape(message)}</p>"
            '<a class="button button--primary" href="/account/reset">Start again</a>'
            "</div></main>"
        )
        return set_session_cookie(
            render(request, "Reset your password | Lowe's", body, status_code=400),
            token,
        )
    body = (
        '<main class="shell section"><h1>Choose a new password</h1>'
        '<form action="/account/reset/complete" method="post">'
        '<label class="field"><span class="field__label">New password</span>'
        '<input class="field__control" type="password" name="password" '
        'minlength="8" required></label>'
        '<button class="button button--primary">Save new password</button>'
        "</form></main>"
    )
    return set_session_cookie(
        render(request, "Reset your password | Lowe's", body), token
    )


@app.post("/account/reset/complete")
async def account_reset_complete(request: Request) -> HTMLResponse:
    values = await form_values(request)
    token, _owner = ensured_owner(request)
    try:
        new_token = account_backend.complete_password_reset(
            auth_services(), token, new_password=values.get("password", "")
        )
    except Exception as exc:
        _field, message = account_backend.friendly_error(exc)
        body = (
            '<main class="shell section"><div class="notice notice--error">'
            f"<h1>Password was not changed</h1><p>{escape(message)}</p>"
            '<a class="button button--primary" href="/account/reset">Start again</a>'
            "</div></main>"
        )
        return set_session_cookie(
            render(request, "Reset your password | Lowe's", body, status_code=400),
            token,
        )
    body = (
        '<main class="shell section"><div class="order-banner"><h1>Password updated</h1>'
        "<p>Every earlier local session for this account was revoked and you are "
        "signed in on this device only.</p>"
        '<a class="button button--primary" href="/">Continue shopping</a></div></main>'
    )
    account = account_backend.public_account(auth_services().resolve_session(new_token))
    page = HTMLResponse(
        document(
            "Password updated | Lowe's",
            body,
            cart_units_for_token(new_token),
            account=account,
        )
    )
    return set_session_cookie(page, new_token)


@app.post("/checkout/place")
async def checkout_place(request: Request) -> HTMLResponse:
    values = await form_values(request)
    token, owner = ensured_owner(request)
    cart = site_store.get_cart(owner)
    try:
        checkout_data = site_store.validate_checkout(values, cart=cart, scenario_ids=[item["id"] for item in site_store.payment_scenarios()])
        # Binding the order to the account as well as to the session digest is
        # what keeps it visible after a sign-out/sign-in rotates the session.
        result = site_store.place_order(
            owner, checkout_data, account_id=current_account_id(request)
        )
        if result["placed"]:
            order = result["order"]
            body = f'<main class="shell section"><div class="order-banner"><span class="tag tag--approved">Approved local simulation</span><h1>Thanks, your offline order is recorded</h1><p>Order <strong>{escape(order["order_number"])}</strong> totals <strong>${site_store.money(order["total_cents"])}</strong>.</p><p>A simulated confirmation was queued in the local outbox; nothing was sent to Lowe\'s or an external provider.</p><a class="button button--primary" href="/orders">View orders</a></div></main>'
        else:
            payment = result["payment"]
            body = f'<main class="shell section"><div class="notice notice--error"><span class="tag tag--declined">{escape(payment["status"])}</span><h1>Sandbox payment was not approved</h1><p>Your cart is unchanged. Choose the approved scenario to continue.</p><a class="button button--primary" href="/checkout">Try another scenario</a></div></main>'
        response = render(request, "Order result | Lowe's", body)
    except Exception as exc:
        if isinstance(exc, site_store.CheckoutError):
            message = " ".join(exc.errors.values())
        else:
            message = "The local checkout could not be completed."
        response = render(request, "Checkout error | Lowe's", f'<main class="shell section"><div class="notice notice--error"><h1>Check your checkout details</h1><p>{escape(message)}</p><a href="/checkout">Return to checkout</a></div></main>', status_code=400)
    return set_session_cookie(response, token)


@app.get("/orders", response_class=HTMLResponse)
def orders(request: Request) -> HTMLResponse:
    owner = existing_owner(request)
    rows = site_store.orders_for_owner(owner, current_account_id(request)) if owner else []
    if not rows:
        body = '<main class="shell section empty-state"><h1>Order Status</h1><p>No offline orders are associated with this browser session.</p><a class="button button--primary" href="/search">Start shopping</a></main>'
    else:
        cards = "".join(f'<article class="service-card"><span class="tag tag--approved">{escape(str(order["status"]))}</span><h2>{escape(str(order["order_number"]))}</h2><p>{escape(str(order["customer_name"]))} · ${site_store.money(int(order["total_cents"]))} · {escape(str(order["fulfillment"]))}</p><p>{len(order["items"])} line item(s), payment {escape(str(order["payment_status"]))}</p></article>' for order in rows)
        body = f'<main class="shell section"><h1 class="page-title">Order Status</h1><div class="service-grid">{cards}</div></main>'
    return render(request, "Order Status | Lowe's", body)


# ---------------------------------------------------------------------------
# locally generated product artwork
# ---------------------------------------------------------------------------


@app.get("/img/p/{product_id}/{view}.svg")
def product_artwork(product_id: int, view: str) -> Response:
    """Deterministic SVG for a catalog product.

    The clone ships no source photography for the synthetic catalog, so the
    ``/pd/``, ``/pl/``, ``/collections/`` and ``/configure/`` families draw their
    own artwork from the product's category palette and id.
    """

    product = site_store.get_product(product_id)
    if product is None:
        return Response(status_code=404)
    category = commerce.category_index().get(str(product["category_id"]), {})
    svg = product_svg(product, category, view if view in VIEWS else "front")
    return Response(svg, media_type="image/svg+xml")


# ---------------------------------------------------------------------------
# /l/... landing families
# ---------------------------------------------------------------------------


def landing_catalog(page: landing.Landing) -> str:
    if not page.catalog:
        return ""
    query, category_id, sort = page.catalog
    result = site_store.search(
        query=query,
        category_ids=[category_id] if category_id else (),
        sort=sort,
        page_size=8,
    )
    heading = page.catalog_heading or "From this clone's catalog"
    return (
        '<section class="section"><div class="section__head">'
        f'<h2 class="section__title">{escape(heading)}</h2>'
        '<a class="section__more" href="/best-sellers">Browse best sellers</a></div>'
        f'{catalog_grid(result["products"])}</section>'
    )


def landing_body(page: landing.Landing) -> str:
    trail = list(page.trail)
    if not trail or trail[-1][0] != page.heading:
        trail.append((page.heading, None))
    return (
        '<main class="shell section landing-page">'
        + breadcrumb_bar(trail)
        + f'<p class="results-head__count">{escape(page.family)}</p>'
        + f'<h1 class="page-title">{escape(page.heading)}</h1>'
        + f'<p class="landing-intro">{escape(page.intro)}</p>'
        + sandbox_notice(SOURCE_RESTRICTED_NOTE)
        + action_row(page.actions)
        + (
            '<section class="section"><div class="section__head">'
            '<h2 class="section__title">On this page</h2></div>'
            + highlight_grid(page.highlights)
            + "</section>"
            if page.highlights
            else ""
        )
        + (
            '<section class="section"><h2 class="section__title">'
            "What this clone actually does</h2>" + fact_table(page.facts) + "</section>"
            if page.facts
            else ""
        )
        + landing_catalog(page)
        + "</main>"
    )


@app.get("/l/{path:path}", response_class=HTMLResponse)
def landing_route(request: Request, path: str) -> HTMLResponse:
    page = landing.LANDING_PAGES.get("/l/" + path.rstrip("/"))
    if page is None:
        return not_found(request, "/l/" + path)
    return render(request, page.title, landing_body(page))


# ---------------------------------------------------------------------------
# /ai — local shopping assistant
# ---------------------------------------------------------------------------

AI_STARTERS = (
    "refrigerator",
    "cordless drill",
    "interior paint",
    "ceiling fan",
    "water heater",
    "lawn mower",
)


@app.get("/ai", response_class=HTMLResponse)
def ai_assistant(request: Request, q: str = "") -> HTMLResponse:
    question = q.strip()
    starters = "".join(
        f'<a class="chip" href="/ai?q={quote_plus(term)}">{escape(term)}</a>'
        for term in AI_STARTERS
    )
    if question:
        result = site_store.search(query=question, sort="relevance", page_size=6)
        if result["products"]:
            answer = (
                f'<p class="landing-intro">{int(result["total"])} item(s) in this '
                f"clone's catalog match “{escape(question)}”. The ranking is the "
                "same deterministic relevance score the search page uses.</p>"
                + catalog_grid(result["products"])
            )
        else:
            answer = (
                '<div class="empty-state"><h2>Nothing in this catalog matches that</h2>'
                f"<p>“{escape(question)}” returned no rows. This assistant can only "
                "answer from the frozen local catalog — it never calls a model, a "
                "search service or any other network endpoint.</p></div>"
            )
    else:
        answer = (
            '<div class="empty-state"><h2>Ask about something in this catalog</h2>'
            "<p>Pick a starter above or type a product, brand or category.</p></div>"
        )
    body = (
        '<main class="shell section ai-page">'
        + breadcrumb_bar([("Home", "/"), ("AI Assist", None)])
        + '<p class="results-head__count">AI Assist</p>'
        + '<h1 class="page-title">Lowe\'s AI Assist</h1>'
        + '<p class="landing-intro">A local, deterministic shopping assistant. It '
        "answers only from this clone's frozen catalog, so the same question "
        "always returns the same items.</p>"
        + sandbox_notice(
            "No model, inference endpoint or third-party service is contacted. "
            "The source /ai page answered Access Denied to the recorded "
            "Playwright session, so this is not a reproduction of it."
        )
        + '<form class="ai-form" action="/ai" method="get">'
        '<label class="field"><span class="field__label">What are you looking for?</span>'
        f'<input class="field__control" name="q" value="{escape(question, quote=True)}" '
        'placeholder="Describe the project or the product"></label>'
        '<button class="button button--primary" type="submit">Ask</button></form>'
        f'<div class="chip-row">{starters}</div>'
        + answer
        + "</main>"
    )
    title = (
        f"AI Assist: {question} | Lowe's" if question else "Lowe's AI Assist | Lowe's"
    )
    return render(request, title, body, query=question)


# ---------------------------------------------------------------------------
# /b/lowesbrands — brand directory
# ---------------------------------------------------------------------------


@app.get("/b/lowesbrands", response_class=HTMLResponse)
def brand_directory(request: Request, brand: str = "") -> HTMLResponse:
    all_brands = site_store.brands()
    counts = site_store.search(page_size=1)["facet_brands"]
    selected = brand if brand in all_brands else ""
    tiles = "".join(
        f'<a class="brand-tile{" brand-tile--active" if name == selected else ""}" '
        f'href="/b/lowesbrands?brand={quote_plus(name)}">'
        f"<strong>{escape(name)}</strong>"
        f'<span>{int(counts.get(name, 0))} items</span></a>'
        for name in all_brands
    )
    if selected:
        result = site_store.search(brand_names=[selected], sort="top-sellers", page_size=12)
        listing = (
            '<section class="section"><div class="section__head">'
            f'<h2 class="section__title">{escape(selected)} in this catalog</h2>'
            '<a class="section__more" href="/b/lowesbrands">Show every brand</a></div>'
            f'{catalog_grid(result["products"])}</section>'
        )
    else:
        listing = (
            '<section class="section"><p class="landing-intro">Choose a brand to see '
            "everything this clone's catalog carries under it.</p></section>"
        )
    body = (
        '<main class="shell section brand-page">'
        + breadcrumb_bar([("Home", "/"), ("Brands", None)])
        + '<p class="results-head__count">Brand Directory</p>'
        + "<h1 class=\"page-title\">Lowe's Brands</h1>"
        + '<p class="landing-intro">Every brand below is invented for this offline '
        "clone and deliberately names no real Lowe's vendor, so a brand page here "
        "can never be mistaken for a captured one.</p>"
        + sandbox_notice(SOURCE_RESTRICTED_NOTE)
        + f'<div class="brand-grid">{tiles}</div>'
        + listing
        + "</main>"
    )
    title = (
        f"{selected} | Lowe's Brands" if selected else "Lowe's Brands Directory | Lowe's"
    )
    return render(request, title, body)


# ---------------------------------------------------------------------------
# /diy-projects-and-ideas and /n/how-to/...
# ---------------------------------------------------------------------------

DIY_THEMES = (
    (
        "Outdoor cooking",
        "Clean, season and store a grill so it lights first time next season.",
        "/n/how-to/clean-and-maintain-your-grill-ht",
        "Read the how-to",
    ),
    (
        "Family workshops",
        "Free hands-on builds for the MyLowe's Rewards Kids Club.",
        "/diy-projects-and-ideas/workshops",
        "See workshops",
    ),
    (
        "Seasonal refresh",
        "Room-by-room ideas that need paint, lighting and hardware only.",
        "/l/fresh-projects-and-inspiration",
        "Get inspired",
    ),
    (
        "Home maintenance",
        "The seasonal checklist behind this clone's repeat-delivery categories.",
        "/l/shop/home-maintenance",
        "See the checklist",
    ),
    (
        "Window treatments",
        "Measure an opening and configure a blind to it, priced server-side.",
        "/configure/blinds/allen-roth-Cordless-Cellular-Shade/5015737843",
        "Open the configurator",
    ),
    (
        "Paint projects",
        "Sheens, primers and coverage for interior and exterior work.",
        "/l/shop/online-paint-store",
        "Visit the paint store",
    ),
)


@app.get("/diy-projects-and-ideas", response_class=HTMLResponse)
def diy_projects(request: Request) -> HTMLResponse:
    cards = "".join(
        '<article class="service-card">'
        f"<h3>{escape(title)}</h3><p>{escape(copy)}</p>"
        f'<a class="button button--outline" href="{escape(href, quote=True)}">{escape(cta)}</a>'
        "</article>"
        for title, copy, href, cta in DIY_THEMES
    )
    body = (
        '<main class="shell section diy-page">'
        + breadcrumb_bar([("Home", "/"), ("DIY Projects & Ideas", None)])
        + '<p class="results-head__count">Ideas &amp; Inspiration</p>'
        + '<h1 class="page-title">DIY Projects &amp; Ideas</h1>'
        + '<p class="landing-intro">The project hub that sits above this clone\'s '
        "how-to article, its family workshops page and its configurable window "
        "treatments. Every card below opens a page this clone serves itself.</p>"
        + sandbox_notice(SOURCE_RESTRICTED_NOTE)
        + f'<div class="service-grid">{cards}</div>'
        + "</main>"
    )
    return render(request, "DIY Projects & Ideas | Lowe's", body)


GRILL_HOW_TO = {
    "intro": (
        "A grill that is cleaned after the season lights faster, cooks more "
        "evenly and lasts longer. This is the full sequence, from a burnt-on "
        "grate to a covered grill ready for storage."
    ),
    "time": "About 60 minutes, plus drying time",
    "difficulty": "Beginner",
    "steps": (
        (
            "Burn off the residue",
            "Run the grill on high with the lid closed for 15 minutes so food "
            "residue turns to ash, then turn it off and let it cool enough to "
            "handle.",
        ),
        (
            "Brush the grates",
            "Work along the bars, not across them, with a stiff grate brush. "
            "Replace a brush as soon as bristles start to shed.",
        ),
        (
            "Empty the grease tray",
            "Pull the tray and the catch cup, scrape them out and wash them. A "
            "full tray is the most common cause of a flare-up.",
        ),
        (
            "Clean the burner tubes",
            "Brush along the tubes so every port is open, and check that the "
            "flame is blue and even when you relight.",
        ),
        (
            "Wash the exterior",
            "Warm water and dish soap on the lid and cart, rinsed and dried. "
            "Wipe stainless steel along the grain.",
        ),
        (
            "Season and cover",
            "Coat the grates with a thin film of high-smoke-point oil, run the "
            "grill for 15 minutes, let it cool and fit the cover.",
        ),
    ),
    "supplies": (
        "Grate brush or scraper",
        "Bucket, warm water and dish soap",
        "Non-abrasive cloths",
        "High-smoke-point cooking oil",
        "Replacement grease cups",
        "A fitted grill cover",
    ),
}


@app.get("/n/how-to/{article}", response_class=HTMLResponse)
def how_to_article(request: Request, article: str) -> HTMLResponse:
    slug = article.rstrip("/")
    if not slug:
        return not_found(request, "/n/how-to/")
    # The captured inventory carries exactly one how-to path; anything else that
    # matches the pattern gets the same structure with its own URL-derived title
    # rather than a shared filler body.
    is_grill = slug.startswith("clean-and-maintain-your-grill")
    display = commerce.humanize(slug.removesuffix("-ht"))
    heading = "How to Clean and Maintain Your Grill" if is_grill else f"How to {display}"
    intro = GRILL_HOW_TO["intro"] if is_grill else (
        f"A step-by-step local article for {display.lower()}. This clone ships "
        "one fully written how-to; every other path in the family renders this "
        "same structure from its own URL."
    )
    steps = "".join(
        f"<li><h3>{escape(title)}</h3><p>{escape(copy)}</p></li>"
        for title, copy in (
            GRILL_HOW_TO["steps"] if is_grill else (("Plan the work", intro),)
        )
    )
    supplies = "".join(
        f"<li>{escape(item)}</li>"
        for item in (GRILL_HOW_TO["supplies"] if is_grill else ("Project-specific supplies",))
    )
    related = site_store.search(
        query="grill" if is_grill else "", category_ids=("outdoor-living",), page_size=4
    )
    body = (
        '<main class="shell section how-to-page">'
        + breadcrumb_bar(
            [
                ("Home", "/"),
                ("DIY Projects & Ideas", "/diy-projects-and-ideas"),
                (heading, None),
            ]
        )
        + '<p class="results-head__count">How-To</p>'
        + f'<h1 class="page-title">{escape(heading)}</h1>'
        + f'<p class="landing-intro">{escape(intro)}</p>'
        + sandbox_notice(SOURCE_RESTRICTED_NOTE)
        + fact_table(
            (
                ("Time", str(GRILL_HOW_TO["time"]) if is_grill else "Varies"),
                ("Difficulty", str(GRILL_HOW_TO["difficulty"]) if is_grill else "Varies"),
                ("Steps", str(len(GRILL_HOW_TO["steps"]) if is_grill else 1)),
            )
        )
        + f'<section class="section"><h2 class="section__title">Steps</h2><ol class="how-to-steps">{steps}</ol></section>'
        + f'<section class="section"><h2 class="section__title">What you need</h2><ul class="how-to-supplies">{supplies}</ul></section>'
        + (
            '<section class="section"><div class="section__head">'
            '<h2 class="section__title">Shop this project</h2>'
            '<a class="section__more" href="/c/Outdoors">Shop outdoors</a></div>'
            + catalog_grid(related["products"])
            + "</section>"
            if related["products"]
            else ""
        )
        + "</main>"
    )
    return render(request, f"{heading} | Lowe's", body)


# ---------------------------------------------------------------------------
# /store/ — store finder
# ---------------------------------------------------------------------------


@app.get("/store/", response_class=HTMLResponse)
def store_finder(request: Request, q: str = "") -> HTMLResponse:
    needle = q.strip().casefold()
    rows = site_store.stores()
    matches = [
        row
        for row in rows
        if not needle
        or needle
        in " ".join(
            str(row[key]).casefold() for key in ("name", "city", "state", "zip")
        )
    ]
    cards = "".join(
        '<article class="service-card">'
        f'<h3>{escape(str(row["name"]))}</h3>'
        f'<p>{escape(str(row["city"]))}, {escape(str(row["state"]))} {escape(str(row["zip"]))}<br>'
        f'Closes at {escape(str(row["closes_at"]))}</p>'
        f'<a class="button button--outline" href="/stores/{quote_plus(str(row["state"]).lower())}">'
        f'Stores in {escape(str(row["state"]))}</a>'
        "</article>"
        for row in matches
    )
    if not matches:
        cards = (
            '<div class="empty-state"><h2>No store matches that search</h2>'
            "<p>This clone carries four synthetic stores. Clear the search to see "
            "them all.</p></div>"
        )
    body = (
        '<main class="shell section store-finder">'
        + breadcrumb_bar([("Home", "/"), ("Find a Store", None)])
        + '<p class="results-head__count">Store Finder</p>'
        + "<h1 class=\"page-title\">Find a Lowe's Store</h1>"
        + '<p class="landing-intro">These four stores are the ones the local pickup '
        "selector and the sandbox checkout actually use. Searching filters them "
        "on the server.</p>"
        + sandbox_notice(SOURCE_RESTRICTED_NOTE)
        + '<form class="store-search" action="/store/" method="get">'
        '<label class="field"><span class="field__label">City, state or ZIP code</span>'
        f'<input class="field__control" name="q" value="{escape(q, quote=True)}" '
        'placeholder="Hawthorne, CA or 90250"></label>'
        '<button class="button button--primary" type="submit">Find stores</button></form>'
        f'<p class="results-head__count">{len(matches)} of {len(rows)} stores</p>'
        f'<div class="service-grid">{cards}</div>'
        + action_row(
            (
                ("Full store directory", "/Lowes-Stores"),
                ("In-store services", "/l/about/store-services"),
            )
        )
        + "</main>"
    )
    return render(request, "Find a Lowe's Store Near You | Lowe's", body)


# ---------------------------------------------------------------------------
# /weekly-ad
# ---------------------------------------------------------------------------

WEEKLY_AD_EVIDENCE_NOTE = (
    "Evidence gap: the recorded Playwright replay of the source Weekly Ad only "
    "ever captured a loading skeleton, so no source layout was observed for this "
    "route at all. The circular below is built entirely from this clone's own "
    "catalog savings."
)


@app.get("/weekly-ad", response_class=HTMLResponse)
def weekly_ad(request: Request, store: str = "") -> HTMLResponse:
    stores = site_store.stores()
    selected = next(
        (row for row in stores if str(row["id"]) == store), stores[0] if stores else None
    )
    options = "".join(
        f'<option value="{escape(str(row["id"]), quote=True)}"'
        + (" selected" if selected and row["id"] == selected["id"] else "")
        + f'>{escape(str(row["name"]))} — {escape(str(row["city"]))}, {escape(str(row["state"]))}</option>'
        for row in stores
    )
    front = site_store.search(sort="savings", page_size=4)
    inside = site_store.search(sort="savings", page_size=8, page=2)
    body = (
        '<main class="shell section weekly-ad-page">'
        + breadcrumb_bar([("Home", "/"), ("Weekly Ad", None)])
        + '<p class="results-head__count">Weekly Ad</p>'
        + '<h1 class="page-title">This Week\'s Ad</h1>'
        + '<p class="landing-intro">Every offer below is computed from the local '
        "catalog's own was-and-now prices, so the ad, the product card and the "
        "cart all quote the same number.</p>"
        + sandbox_notice(WEEKLY_AD_EVIDENCE_NOTE)
        + '<form class="weekly-ad-store" action="/weekly-ad" method="get">'
        '<label class="field"><span class="field__label">Ad for store</span>'
        f'<select class="field__control" name="store" data-autosubmit>{options}</select></label>'
        '<button class="button button--outline" type="submit">Show this ad</button></form>'
        + (
            f'<p class="results-head__count">Showing the ad for {escape(str(selected["name"]))},'
            f' {escape(str(selected["city"]))}, {escape(str(selected["state"]))}.</p>'
            if selected
            else ""
        )
        + '<section class="section"><div class="section__head">'
        '<h2 class="section__title">Front page</h2></div>'
        + catalog_grid(front["products"])
        + "</section>"
        '<section class="section"><div class="section__head">'
        '<h2 class="section__title">Inside the ad</h2>'
        '<a class="section__more" href="/l/savings">All savings</a></div>'
        + catalog_grid(inside["products"])
        + "</section>"
        + action_row(
            (
                ("Coupons", "/l/savings/coupons"),
                ("Daily deals", "/l/savings/daily-deals"),
                ("Find a store", "/store/"),
            )
        )
        + "</main>"
    )
    return render(request, "Weekly Ad | Lowe's", body)


# ---------------------------------------------------------------------------
# /mylowes/orders/checkorderstatus — guest order lookup
# ---------------------------------------------------------------------------


@app.get("/mylowes/orders/checkorderstatus", response_class=HTMLResponse)
def check_order_status(
    request: Request, email: str = "", order_number: str = ""
) -> HTMLResponse:
    result = ""
    if email.strip() and order_number.strip():
        order = site_store.get_order(order_number.strip().upper())
        # The same wording covers "no such order" and "wrong email", so the form
        # cannot be used to discover which order numbers exist.
        if order and str(order["email"]).casefold() == email.strip().casefold():
            items = "".join(
                f'<tr><th scope="row">{escape(str(item["title"]))}</th>'
                f'<td>{int(item["quantity"])}</td>'
                f'<td>{cents(int(item["line_total_cents"]))}</td></tr>'
                for item in order["items"]
            )
            result = (
                '<div class="order-banner">'
                f'<span class="tag tag--approved">{escape(str(order["status"]))}</span>'
                f'<h2>{escape(str(order["order_number"]))}</h2>'
                f'<p>{escape(str(order["customer_name"]))} · '
                f'{escape(str(order["fulfillment"]))} · '
                f'{cents(int(order["total_cents"]))}</p>'
                '<table class="spec-table"><thead><tr><th>Item</th><th>Qty</th>'
                f"<th>Line total</th></tr></thead><tbody>{items}</tbody></table>"
                "<p>This is a local sandbox order. No Lowe's order exists.</p></div>"
            )
        else:
            result = (
                '<div class="notice notice--error">No local order matches that '
                "order number and email address. This lookup only reads orders "
                "placed inside this clone.</div>"
            )
    body = (
        '<main class="order-search-page"><div class="shell">'
        + breadcrumb_bar(
            [
                ("Home", "/"),
                ("Orders Search", "/mylowes/orders"),
                ("Check Order Status", None),
            ]
        )
        + '<section class="order-search-card">'
        "<h1>Look Up an Order</h1>"
        '<p>Enter the order number from a local sandbox confirmation together with '
        "the email address it was placed under. The lookup runs against this "
        "clone's own database.</p>"
        '<form action="/mylowes/orders/checkorderstatus" method="get">'
        '<label class="field"><span class="visually-hidden">Email address</span>'
        f'<input class="field__control" type="email" name="email" value="{escape(email, quote=True)}" '
        'placeholder="✉  Enter email address" required>'
        "<small>The email address used at local checkout</small></label>"
        '<label class="field"><span class="visually-hidden">Order Number</span>'
        f'<input class="field__control" name="order_number" value="{escape(order_number, quote=True)}" '
        'placeholder="▧  Enter Order Number, for example LWS-700001" required>'
        "<small>Shown on the local order confirmation</small></label>"
        '<button class="button button--primary button--block">Look Up Order</button>'
        "</form>"
        + result
        + '<p class="order-account-copy">Signed in? Your local order history is on '
        '<a href="/orders">Order Status</a>.</p>'
        '<p><a href="/mylowes/orders">Back to Orders Search</a></p>'
        "</section></div></main>"
    )
    return render(request, "Look Up an Order — Check Order Status | Lowe's", body)


# ---------------------------------------------------------------------------
# /lists
# ---------------------------------------------------------------------------


@app.get("/lists", response_class=HTMLResponse)
def lists_page(request: Request) -> HTMLResponse:
    body = (
        '<main class="shell section">'
        + breadcrumb_bar([("Home", "/"), ("Lists", None)])
        + '<h1 class="page-title">Lists</h1>'
        + '<p class="landing-intro">Saved lists are an account feature. This clone '
        "keeps a real per-session cart instead, and does not persist a separate "
        "list.</p>"
        + '<div class="empty-state"><h2>No saved lists</h2>'
        '<p><a class="button button--primary" href="/cart">Go to your cart</a></p></div>'
        + "</main>"
    )
    return render(request, "Lists | Lowe's", body)


# ---------------------------------------------------------------------------
# /pd/{source-slug}/{item-id} — product detail
# ---------------------------------------------------------------------------


@app.get("/pd/{slug}/{item_id}", response_class=HTMLResponse)
def product_detail_route(request: Request, slug: str, item_id: str) -> HTMLResponse:
    detail = commerce.product_detail(slug, item_id)
    product = detail["product"]
    thumbs = "".join(
        f'<button class="pdp__thumb" type="button" aria-current="{"true" if index == 0 else "false"}"'
        f' data-gallery-thumb="{catalog_art(int(product["id"]), view)}"'
        f' data-gallery-alt="{escape(detail["display_title"], quote=True)} — {view} view">'
        f'<img src="{catalog_art(int(product["id"]), view)}" width="80" height="80" alt="">'
        "</button>"
        for index, view in enumerate(VIEWS)
    )
    specs = "".join(
        f'<tr><th scope="row">{escape(str(name))}</th><td>{escape(str(value))}</td></tr>'
        for name, value in product["specs"]
    )
    specs += (
        f'<tr><th scope="row">Model</th><td>{escape(str(product["model_number"]))}</td></tr>'
        f'<tr><th scope="row">Item</th><td>{escape(item_id)}</td></tr>'
        f'<tr><th scope="row">Category</th><td>{escape(detail["category_label"])}</td></tr>'
    )
    pickup_note = (
        "Free pickup today at your selected store"
        if product["pickup_today"]
        else "Not available for store pickup"
    )
    body = (
        '<main class="shell section pdp-page">'
        + breadcrumb_bar(
            [
                ("Home", "/"),
                (detail["category_label"], f'/c/{quote_plus(detail["category_label"])}'),
                (detail["display_title"], None),
            ]
        )
        + '<div class="pdp">'
        f'<div class="pdp__thumbs">{thumbs}</div>'
        f'<div class="pdp__stage"><img src="{catalog_art(int(product["id"]))}" '
        f'alt="{escape(detail["display_title"], quote=True)}" data-gallery-stage></div>'
        '<section class="pdp__buybox">'
        f'<span class="product-card__brand">{escape(str(product["brand"]))}</span>'
        f'<h1 class="pdp__title">{escape(detail["display_title"])}</h1>'
        f'<p class="results-head__count">Item # {escape(item_id)} · '
        f'Model # {escape(str(product["model_number"]))}</p>'
        + rating_line(product)
        + price_line(product)
        + f'<p>{escape(str(product["summary"]))}</p>'
        '<form action="/cart/add" method="post">'
        f'<input type="hidden" name="product_id" value="{int(product["id"])}">'
        '<div class="fulfillment"><h2>How do you want to get your item?</h2>'
        '<label class="fulfillment-choice"><input type="radio" name="fulfillment" '
        f'value="pickup"{" checked" if product["pickup_today"] else " disabled"}> '
        f"Pickup — {escape(pickup_note)}</label>"
        '<label class="fulfillment-choice"><input type="radio" name="fulfillment" '
        f'value="delivery"{"" if product["pickup_today"] else " checked"}> '
        f'Delivery — {"Free" if product["free_delivery"] else "Fee applies"} in '
        f'{int(product["delivery_days"])} days</label></div>'
        '<div class="quantity" data-quantity>'
        '<button type="button" data-quantity-step="-1" aria-label="Decrease quantity">−</button>'
        '<label class="visually-hidden" for="pdp-quantity">Quantity</label>'
        '<input id="pdp-quantity" type="number" name="quantity" value="1" min="1" max="99" step="1">'
        '<button type="button" data-quantity-step="1" aria-label="Increase quantity">+</button></div>'
        '<button class="button button--primary button--block" type="submit">Add to Cart</button>'
        "</form>"
        f'<p class="results-head__count">{int(product["stock"])} in stock in this '
        "clone's synthetic inventory.</p>"
        + sandbox_notice(SYNTHETIC_COMMERCE_NOTE)
        + "</section></div>"
        f'<section class="section"><h2 class="section__title">Product details</h2>'
        f'<table class="spec-table"><tbody>{specs}</tbody></table></section>'
        + (
            '<section class="section"><div class="section__head">'
            '<h2 class="section__title">Customers also viewed</h2></div>'
            + catalog_grid(detail["related"])
            + "</section>"
            if detail["related"]
            else ""
        )
        + "</main>"
    )
    return render(request, f"{detail['display_title']} | Lowe's", body)


# ---------------------------------------------------------------------------
# /pl/... — product list
# ---------------------------------------------------------------------------


def query_string(request: Request, **overrides: Any) -> str:
    pairs: list[tuple[str, str]] = [
        (key, value)
        for key, value in request.query_params.multi_items()
        if key not in overrides
    ]
    for key, value in overrides.items():
        if value in (None, "", False):
            continue
        if isinstance(value, (list, tuple)):
            pairs.extend((key, str(item)) for item in value)
        else:
            pairs.append((key, str(value)))
    return urlencode(pairs)


def list_filters_form(
    action: str, request: Request, result: Mapping[str, Any]
) -> str:
    selected_brands = set(request.query_params.getlist("brand"))
    facet_brands = result["facet_brands"]
    brand_options = "".join(
        '<label class="filters__option"><input type="checkbox" name="brand"'
        f' value="{escape(name, quote=True)}"'
        + (" checked" if name in selected_brands else "")
        + f'><span>{escape(name)}</span>'
        f'<span class="results-head__count">({count})</span></label>'
        for name, count in sorted(facet_brands.items())
    )
    rating = request.query_params.get("rating", "")
    rating_options = "".join(
        '<label class="filters__option"><input type="radio" name="rating"'
        f' value="{value}"' + (" checked" if rating == value else "")
        + f"><span>{value} stars &amp; up</span></label>"
        for value in ("4.5", "4", "3")
    )
    return (
        f'<form class="filters" method="get" action="{escape(action, quote=True)}">'
        '<fieldset class="filters__group">'
        '<legend class="filters__legend">Brand</legend>'
        + (brand_options or '<p class="results-head__count">No brands in scope</p>')
        + "</fieldset>"
        '<fieldset class="filters__group">'
        '<legend class="filters__legend">Price</legend>'
        '<div class="filters__price">'
        '<label class="visually-hidden" for="min-price">Minimum price</label>'
        '<input class="field__control" id="min-price" type="number" min="0" step="1"'
        f' name="min_price" value="{escape(request.query_params.get("min_price", ""), quote=True)}" placeholder="Min">'
        '<label class="visually-hidden" for="max-price">Maximum price</label>'
        '<input class="field__control" id="max-price" type="number" min="0" step="1"'
        f' name="max_price" value="{escape(request.query_params.get("max_price", ""), quote=True)}" placeholder="Max">'
        "</div></fieldset>"
        '<fieldset class="filters__group">'
        '<legend class="filters__legend">Customer Rating</legend>'
        + rating_options
        + "</fieldset>"
        '<fieldset class="filters__group">'
        '<legend class="filters__legend">Availability</legend>'
        '<label class="filters__option"><input type="checkbox" name="pickup" value="1"'
        + (" checked" if request.query_params.get("pickup") else "")
        + "><span>Pickup today</span></label>"
        '<label class="filters__option"><input type="checkbox" name="free_delivery" value="1"'
        + (" checked" if request.query_params.get("free_delivery") else "")
        + "><span>Free delivery</span></label>"
        "</fieldset>"
        f'<input type="hidden" name="sort" value="{escape(request.query_params.get("sort", "relevance"), quote=True)}">'
        '<button class="button button--primary button--block" type="submit">Apply filters</button>'
        f'<a class="link-button" href="{escape(action, quote=True)}">Clear all filters</a>'
        "</form>"
    )


def pagination_bar(path: str, request: Request, result: Mapping[str, Any]) -> str:
    if int(result["page_count"]) <= 1:
        return ""
    links = "".join(
        '<a class="pagination__link"'
        + (' aria-current="page"' if number == int(result["page"]) else "")
        + f' href="{escape(path, quote=True)}?{escape(query_string(request, page=number), quote=True)}">{number}</a>'
        for number in range(1, int(result["page_count"]) + 1)
    )
    return f'<nav class="pagination" aria-label="Result pages">{links}</nav>'


@app.get("/pl/{path:path}", response_class=HTMLResponse)
def product_list_route(request: Request, path: str) -> HTMLResponse:
    segments = [segment for segment in path.split("/") if segment]
    if len(segments) < 2:
        return not_found(request, "/pl/" + path)
    collection_id = segments[-1]
    title_segments = segments[:-1]
    params = request.query_params
    page = params.get("page", "1")
    listing = commerce.list_page(
        title_segments,
        collection_id,
        brands=params.getlist("brand"),
        min_price=params.get("min_price", ""),
        max_price=params.get("max_price", ""),
        rating=params.get("rating", ""),
        pickup=bool(params.get("pickup")),
        free_delivery=bool(params.get("free_delivery")),
        sort=params.get("sort", "relevance"),
        page=int(page) if page.isdigit() else 1,
    )
    result = listing["result"]
    action = "/pl/" + path
    sort_options = "".join(
        f'<option value="{key}"'
        + (" selected" if result["sort"] == key else "")
        + f">{escape(label)}</option>"
        for key, label in site_store.SORT_OPTIONS
    )
    refinement_chips = "".join(
        f'<span class="applied-filters__chip">{escape(label)}</span>'
        for label in listing["refinements"]
    )
    body = (
        '<main class="shell section plp-page">'
        + breadcrumb_bar(
            [("Home", "/"), ("Shop", "/c/Departments"), (listing["heading"], None)]
        )
        + '<p class="results-head__count">Collection ' + escape(collection_id) + "</p>"
        + f'<h1 class="page-title">{escape(listing["heading"])}</h1>'
        + (f'<div class="applied-filters">{refinement_chips}</div>' if refinement_chips else "")
        + sandbox_notice(SYNTHETIC_COMMERCE_NOTE)
        + '<div class="results-layout">'
        + list_filters_form(action, request, result)
        + "<section>"
        + '<div class="results-head">'
        + (
            f'<p class="results-head__count">Showing {int(result["first_index"])}–'
            f'{int(result["last_index"])} of {int(result["total"])} results in '
            f'{escape(listing["scope"]["label"])}</p>'
            if int(result["total"])
            else '<p class="results-head__count">0 results</p>'
        )
        + f'<form method="get" action="{escape(action, quote=True)}">'
        + "".join(
            f'<input type="hidden" name="brand" value="{escape(name, quote=True)}">'
            for name in params.getlist("brand")
        )
        + '<label class="visually-hidden" for="pl-sort">Sort by</label>'
        f'<select class="field__control sort-select" id="pl-sort" name="sort" data-autosubmit>{sort_options}</select>'
        '<button class="visually-hidden" type="submit">Sort</button></form>'
        "</div>"
        + catalog_grid(result["products"])
        + pagination_bar(action, request, result)
        + "</section></div></main>"
    )
    return render(request, f"{listing['heading']} at Lowes.com", body)


# ---------------------------------------------------------------------------
# /collections/{source-slug}/{collection-id} — appliance suites
# ---------------------------------------------------------------------------


@app.get("/collections/{slug}/{collection_id}", response_class=HTMLResponse)
def collection_route(request: Request, slug: str, collection_id: str) -> HTMLResponse:
    package = commerce.collection_package(slug, collection_id)
    rows = "".join(
        '<article class="package-member">'
        f'<a class="package-member__media" href="{escape(str(product["url"]), quote=True)}">'
        f'<img src="{catalog_art(int(product["id"]))}" width="320" height="320" alt=""></a>'
        f'<div><span class="results-head__count">{escape(role)}</span>'
        f'<span class="product-card__brand">{escape(str(product["brand"]))}</span>'
        f'<a class="product-card__title" href="{escape(str(product["url"]), quote=True)}">'
        f'{escape(str(product["title"]))}</a>{rating_line(product)}</div>'
        f'<strong>{cents(int(product["price_cents"]))}</strong></article>'
        for role, product in package["members"]
    )
    hidden_ids = "".join(
        f'<input type="hidden" name="product_id" value="{product_id}">'
        for product_id in package["product_ids"]
    )
    body = (
        '<main class="shell section collection-page">'
        + breadcrumb_bar(
            [
                ("Home", "/"),
                ("Appliances", "/c/Appliances"),
                (package["display_title"], None),
            ]
        )
        + '<p class="results-head__count">Appliance Suite '
        + escape(collection_id)
        + "</p>"
        + f'<h1 class="page-title">{escape(package["display_title"])}</h1>'
        + '<p class="landing-intro">A four-piece suite assembled from this clone\'s '
        "catalog. Adding the suite adds every member as a real cart line, priced "
        "at each member's own catalog price.</p>"
        + sandbox_notice(SYNTHETIC_COMMERCE_NOTE)
        + '<div class="cart-layout"><section class="package-list">'
        + rows
        + "</section>"
        '<aside class="summary"><h2>Suite total</h2>'
        f'<div class="summary__row"><span>{len(package["members"])} items at list</span>'
        f'<strong>{cents(package["list_total_cents"])}</strong></div>'
        f'<div class="summary__row"><span>Suite savings</span>'
        f'<strong>-{cents(package["discount_cents"])}</strong></div>'
        '<div class="summary__row summary__row--total"><span>Suite price</span>'
        f'<strong>{cents(package["package_total_cents"])}</strong></div>'
        '<form action="/cart/add" method="post">'
        + hidden_ids
        + '<input type="hidden" name="fulfillment" value="delivery">'
        '<button class="button button--primary button--block" type="submit">'
        "Add all four to cart</button></form>"
        '<p class="results-head__count">The suite discount is a local display rule; '
        "each cart line is recorded at its own catalog price.</p>"
        "</aside></div>"
        + action_row(
            (
                ("Shop appliances", "/c/Appliances"),
                ("Installation services", "/l/install"),
                ("Delivery details", "/l/help/shipping-delivery"),
            )
        )
        + "</main>"
    )
    return render(request, f"{package['display_title']} | Lowe's", body)


# ---------------------------------------------------------------------------
# /configure/blinds/{source-slug}/{item-id} — made-to-measure configurator
# ---------------------------------------------------------------------------


def option_select(
    name: str, label: str, options: Sequence[tuple[str, str]], selected: str
) -> str:
    choices = "".join(
        f'<option value="{escape(value, quote=True)}"'
        + (" selected" if value == selected else "")
        + f">{escape(text)}</option>"
        for value, text in options
    )
    return (
        f'<label class="field"><span class="field__label">{escape(label)}</span>'
        f'<select class="field__control" name="{name}">{choices}</select></label>'
    )


@app.get("/configure/blinds/{slug}/{item_id}", response_class=HTMLResponse)
def blinds_configurator(
    request: Request, slug: str, item_id: str
) -> HTMLResponse:
    quote = commerce.blind_configuration(slug, item_id, dict(request.query_params))
    product = quote["product"]
    action = f"/configure/blinds/{slug}/{item_id}"
    body = (
        '<main class="shell section configure-page">'
        + breadcrumb_bar(
            [
                ("Home", "/"),
                ("Window Treatments", "/c/Window-treatments-Home-decor"),
                (quote["display_title"], None),
            ]
        )
        + '<p class="results-head__count">Made to Measure · Item # '
        + escape(item_id)
        + "</p>"
        + f'<h1 class="page-title">Configure: {escape(quote["display_title"])}</h1>'
        + '<p class="landing-intro">Choose a size and the lift, opacity and colour '
        "options. The quote is recalculated on the server from a frozen option "
        "table, so a hand-edited query string cannot produce an unpriced "
        "configuration.</p>"
        + sandbox_notice(SYNTHETIC_COMMERCE_NOTE)
        + '<div class="cart-layout"><section>'
        f'<form class="configure-form" method="get" action="{escape(action, quote=True)}">'
        + option_select(
            "width",
            "Width (inches)",
            tuple((str(value), f"{value} in") for value in commerce.BLIND_WIDTHS),
            str(quote["width"]),
        )
        + option_select(
            "height",
            "Height (inches)",
            tuple((str(value), f"{value} in") for value in commerce.BLIND_HEIGHTS),
            str(quote["height"]),
        )
        + option_select("mount", "Mount", commerce.BLIND_MOUNTS, quote["mount"])
        + option_select(
            "control",
            "Lift control",
            tuple((value, label) for value, label, _extra in commerce.BLIND_CONTROLS),
            quote["control"],
        )
        + option_select("opacity", "Opacity", commerce.BLIND_ROOMS, quote["opacity"])
        + option_select("color", "Colour", commerce.BLIND_COLORS, quote["color"])
        + '<button class="button button--primary" type="submit">Update quote</button>'
        "</form>"
        f'<div class="configure-preview"><img src="{catalog_art(int(product["id"]), "detail")}" '
        f'width="320" height="320" alt="{escape(quote["display_title"], quote=True)}"></div>'
        "</section>"
        '<aside class="summary"><h2>Your configuration</h2>'
        + "".join(
            f'<div class="summary__row"><span>{escape(label)}</span><span>{escape(value)}</span></div>'
            for label, value in (
                ("Size", f'{quote["width"]} in × {quote["height"]} in'),
                ("Area", f'{quote["square_feet"]} sq ft'),
                ("Mount", quote["labels"]["mount"]),
                ("Lift", quote["labels"]["control"]),
                ("Opacity", quote["labels"]["opacity"]),
                ("Colour", quote["labels"]["color"]),
            )
        )
        + f'<div class="summary__row"><span>Base</span><span>{cents(quote["base_cents"])}</span></div>'
        f'<div class="summary__row"><span>Oversize</span><span>{cents(quote["size_cents"])}</span></div>'
        f'<div class="summary__row"><span>Lift upgrade</span><span>{cents(quote["control_cents"])}</span></div>'
        '<div class="summary__row summary__row--total"><span>Configured quote</span>'
        f'<strong>{cents(quote["unit_cents"])}</strong></div>'
        '<form action="/cart/add" method="post">'
        f'<input type="hidden" name="product_id" value="{int(product["id"])}">'
        '<input type="hidden" name="fulfillment" value="delivery">'
        '<button class="button button--primary button--block" type="submit">'
        "Add the base item to cart</button></form>"
        '<p class="results-head__count">Truthful-simulation boundary: the local '
        "cart records the base catalog item at "
        f"{cents(quote['base_cents'])}. The configured quote above is computed "
        "for display and is not stored as a cart line, because this clone's cart "
        "schema holds no configuration.</p>"
        "</aside></div>"
        + action_row(
            (
                ("Special orders", "/l/help/special-orders"),
                ("Installation services", "/l/install"),
                ("Shop window treatments", "/c/Window-treatments-Home-decor"),
            )
        )
        + "</main>"
    )
    return render(
        request, f"Configure {quote['display_title']} | Lowe's", body
    )


# ---------------------------------------------------------------------------
# not found
# ---------------------------------------------------------------------------


def not_found(request: Request, path: str) -> HTMLResponse:
    body = (
        '<main class="shell section empty-state"><h1>Page not found</h1>'
        f"<p>Nothing is served at <code>{escape(path)}</code> in this offline "
        "clone.</p>"
        '<p><a class="button button--primary" href="/">Back to home</a> '
        '<a class="button button--outline" href="/c/Departments">Shop all departments</a></p>'
        "</main>"
    )
    return render(request, "Page not found | Lowe's", body, status_code=404)


@app.get("/{path:path}")
def informational(request: Request, path: str) -> Response:
    target = LEGACY_REDIRECTS.get(path.strip("/"))
    if target:
        # A pre-inventory alias keeps working, but the source-compatible path is
        # the one canonical URL from here on.
        return RedirectResponse(target, status_code=308)
    return not_found(request, "/" + path)