"""Catalog fixture access and cart/favorite persistence for the Article clone.

The catalog is a read-only fixture derived from source-observed evidence.
Mutable state (cart, favorites, orders) lives in this site's bound SQLite
database, opened only through the generated backend integration seam.
"""

from __future__ import annotations

import json
import pathlib
import time
from typing import Any

from backend.site_backend_integration import open_site_services

DATA = pathlib.Path(__file__).resolve().parent / "data"
_catalog: dict[str, Any] | None = None
_services: tuple[Any, Any] | None = None


def catalog() -> dict[str, Any]:
    global _catalog
    if _catalog is None:
        _catalog = json.loads((DATA / "catalog.json").read_text(encoding="utf-8"))
        _catalog["by_id"] = {p["product_id"]: p for p in _catalog["products"]}
        _catalog["by_slug"] = {p["slug"]: p for p in _catalog["products"]}
    return _catalog


def services() -> tuple[Any, Any]:
    """Open the bound backend once and make the synthetic demo account usable.

    Seeding is idempotent, so a reset database always comes back with the same
    deterministic reviewer credentials.
    """

    global _services
    if _services is None:
        _services = open_site_services()
        from site_schema import SYNTHETIC_ACCOUNTS

        for account in SYNTHETIC_ACCOUNTS:
            try:
                _services[1].seed_account(**account)
            except Exception:  # a pre-seeded database is not an error
                pass
    return _services


def backend():
    return services()[0]


def auth():
    return services()[1]


def connect():
    return auth().connect()


def product(product_id: str) -> dict[str, Any] | None:
    return catalog()["by_id"].get(product_id)


def collection(collection_id: str) -> list[dict[str, Any]]:
    ids = catalog()["collections"].get(collection_id, [])
    return [catalog()["by_id"][i] for i in ids if i in catalog()["by_id"]]


_subcategories: dict[str, Any] | None = None


def subcategories(browse_id: str) -> list[dict[str, Any]]:
    """Source-observed subcategory tiles, narrowed to products this clone holds."""

    global _subcategories
    if _subcategories is None:
        path = DATA / "subcategories.json"
        _subcategories = json.loads(path.read_text(encoding="utf-8")) if path.exists() else {}
    entries = []
    for entry in _subcategories.get(browse_id, []):
        local = [pid for pid in entry["member_product_ids"] if pid in catalog()["by_id"]]
        if not local:
            continue  # never render a tile that would open an empty result
        entries.append({**entry, "local_product_ids": local})
    return entries


_content: dict[str, Any] | None = None


def _content_pages() -> dict[str, Any]:
    global _content
    if _content is None:
        path = DATA / "content.json"
        _content = json.loads(path.read_text(encoding="utf-8")) if path.exists() else {}
    return _content


def content_routes() -> list[str]:
    return sorted(_content_pages())


def content_page(route: str) -> dict[str, Any] | None:
    return _content_pages().get(route)


def cart_recommendations(limit: int = 6) -> list[dict[str, Any]]:
    """The order the source's empty cart renders under Browse popular products."""

    path = DATA / "cart-recommendations.json"
    ids = json.loads(path.read_text(encoding="utf-8"))["product_ids"] if path.exists() else []
    picked = [product(i) for i in ids]
    picked = [p for p in picked if p]
    if len(picked) < limit:
        for extra in collection("living-furniture"):
            if extra not in picked:
                picked.append(extra)
            if len(picked) >= limit:
                break
    return picked[:limit]


_menu_routes: dict[str, Any] | None = None


def menu_routes() -> dict[str, Any]:
    global _menu_routes
    if _menu_routes is None:
        path = DATA / "menu-routes.json"
        _menu_routes = json.loads(path.read_text(encoding="utf-8")) if path.exists() else {}
    return _menu_routes


def menu_route(path: str) -> dict[str, Any] | None:
    """A mega-menu destination with its source-observed membership narrowed to
    the products this clone holds."""

    entry = menu_routes().get(path)
    if entry is None:
        return None
    products = [catalog()["by_id"][i] for i in entry["product_ids"]
                if i in catalog()["by_id"]]
    return {**entry, "products": products}


_megamenu: dict[str, Any] | None = None


def mega_menu(label: str) -> dict[str, Any] | None:
    """The captured dropdown for one nav item, narrowed to destinations this
    clone serves so a menu control never opens a dead route."""

    global _megamenu
    if _megamenu is None:
        path = DATA / "megamenu.json"
        _megamenu = json.loads(path.read_text(encoding="utf-8")) if path.exists() else {}
    return _megamenu.get(label)


_facets: dict[str, Any] | None = None


def facet_groups(browse_id: str) -> list[dict[str, Any]]:
    """Source-observed filter groups for a collection, with each option's count
    recomputed against the products this clone actually holds."""

    global _facets
    if _facets is None:
        path = DATA / "facets.json"
        _facets = json.loads(path.read_text(encoding="utf-8")) if path.exists() else {}
    entry = _facets.get(browse_id)
    return entry["groups"] if entry else []


def facet_local_count(products: list[dict[str, Any]], label: str) -> int:
    """How many of these products the option's label matches by name."""

    needle = label.lower()
    return sum(1 for p in products if needle in p["name"].lower())


_room_tiles: list[dict[str, Any]] | None = None

# Display titles as the source renders them beneath each All Rooms tile; the CMS
# alt text ("Shop By Bedroom") differs from the visible label.
ROOM_TITLES = {
    "/browse/224/living-furniture": "Living Room",
    "/browse/222/dining-furniture": "Dining Room & Kitchen",
    "/browse/225/bedroom-furniture": "Bedroom",
    "/browse/223/home-office-furniture": "Home Office",
    "/browse/58/outdoor": "Outdoor",
    "/browse/345/entryway-furniture": "Entryway",
}


def room_tiles() -> list[dict[str, Any]]:
    """Only tiles whose destination this clone actually serves are rendered."""

    global _room_tiles
    if _room_tiles is None:
        path = DATA / "room-tiles.json"
        raw = json.loads(path.read_text(encoding="utf-8")) if path.exists() else []
        _room_tiles = [
            {**t, "title": ROOM_TITLES[t["href"]]}
            for t in raw if t.get("href") in ROOM_TITLES and t.get("image")
        ]
    return _room_tiles


def subcategory_by_tc(browse_id: str, tc: str) -> dict[str, Any] | None:
    for entry in subcategories(browse_id):
        if entry["tc"] == tc:
            return entry
    return None


def variants_for(prod: dict[str, Any]) -> list[dict[str, Any]]:
    """Colour siblings this clone actually serves; a dropped product must never
    remain linked from a swatch."""

    return [v for v in (prod.get("variants") or []) if v["product_id"] in catalog()["by_id"]]


def all_products() -> list[dict[str, Any]]:
    return catalog()["products"]


COLLECTION_ROUTES = {
    "living-furniture": ("/browse/224/living-furniture", "Living Room"),
    "dining-furniture": ("/browse/222/dining-furniture", "Dining & Kitchen"),
    "bedroom-furniture": ("/browse/225/bedroom-furniture", "All Bedroom"),
    "outdoor": ("/browse/58/outdoor", "Outdoor"),
    "decor": ("/browse/48/decor", "Accessories & Decor"),
    "home-office": ("/browse/223/home-office-furniture", "Home Office"),
    "entryway": ("/browse/345/entryway-furniture", "Entryway"),
    "new-arrivals": ("/browse/100/new", "New Arrivals"),
    "all-rooms": ("/c/all-rooms", "All Rooms"),
}


def primary_collection(product_id: str) -> tuple[str, str]:
    """The collection whose breadcrumb the source shows for this product."""

    for name in COLLECTION_ROUTES:
        if product_id in catalog()["collections"].get(name, []):
            return name, COLLECTION_ROUTES[name][1]
    return "all-rooms", COLLECTION_ROUTES["all-rooms"][1]


def collection_href(name: str) -> str:
    return COLLECTION_ROUTES.get(name, COLLECTION_ROUTES["all-rooms"])[0]


def search(query: str) -> list[dict[str, Any]]:
    q = query.strip().lower()
    if not q:
        return []
    return [p for p in all_products() if q in p["name"].lower()]


# --- mutable state -------------------------------------------------------

def owner_key(session_token: str, session: dict[str, Any]) -> str:
    """Scope cart state to the account when signed in, else to the session."""

    account = session.get("account") if session else None
    if account:
        return f"account:{account['account_id']}"
    return f"session:{auth().session_owner_digest(session_token)}"


def cart_items(owner: str) -> list[dict[str, Any]]:
    with connect() as connection:
        rows = connection.execute(
            "SELECT product_id, quantity FROM article_cart_items"
            " WHERE owner_key=? ORDER BY cart_item_id",
            (owner,),
        ).fetchall()
    items = []
    for row in rows:
        prod = product(str(row["product_id"]))
        if prod is None:
            continue
        items.append({
            "product": prod,
            "quantity": int(row["quantity"]),
            "line_cents": prod["price_cents"] * int(row["quantity"]),
        })
    return items


def cart_count(owner: str) -> int:
    with connect() as connection:
        row = connection.execute(
            "SELECT COALESCE(SUM(quantity), 0) AS n FROM article_cart_items WHERE owner_key=?",
            (owner,),
        ).fetchone()
    return int(row["n"]) if row else 0


def cart_subtotal(owner: str) -> int:
    return sum(i["line_cents"] for i in cart_items(owner))


# Deterministic local checkout arithmetic. The source's USD shipping and tax
# figures were not captured (the checkout capture ran on a CAD-region egress),
# so these are this clone's own fixed sandbox rules, not source-observed values.
SHIPPING_FLAT_CENTS = 4900
FREE_SHIPPING_THRESHOLD_CENTS = 99900
TAX_RATE_BASIS_POINTS = 875  # 8.75%


def shipping_cents(subtotal: int) -> int:
    if subtotal == 0 or subtotal >= FREE_SHIPPING_THRESHOLD_CENTS:
        return 0
    return SHIPPING_FLAT_CENTS


def tax_cents(subtotal: int) -> int:
    return (subtotal * TAX_RATE_BASIS_POINTS + 5000) // 10000


def add_to_cart(owner: str, product_id: str, quantity: int = 1) -> None:
    if product(product_id) is None:
        raise KeyError(product_id)
    now = int(time.time())
    with connect() as connection:
        connection.execute(
            "INSERT INTO article_cart_items(owner_key, product_id, quantity, created_at)"
            " VALUES (?,?,?,?)"
            " ON CONFLICT(owner_key, product_id)"
            " DO UPDATE SET quantity = quantity + excluded.quantity",
            (owner, product_id, quantity, now),
        )
        connection.commit()


def set_quantity(owner: str, product_id: str, quantity: int) -> None:
    with connect() as connection:
        if quantity <= 0:
            connection.execute(
                "DELETE FROM article_cart_items WHERE owner_key=? AND product_id=?",
                (owner, product_id),
            )
        else:
            connection.execute(
                "UPDATE article_cart_items SET quantity=? WHERE owner_key=? AND product_id=?",
                (quantity, owner, product_id),
            )
        connection.commit()


def remove_from_cart(owner: str, product_id: str) -> None:
    set_quantity(owner, product_id, 0)


def favorites(owner: str) -> list[dict[str, Any]]:
    with connect() as connection:
        rows = connection.execute(
            "SELECT product_id FROM article_favorites WHERE owner_key=? ORDER BY favorite_id",
            (owner,),
        ).fetchall()
    return [p for p in (product(str(r["product_id"])) for r in rows) if p]


def toggle_favorite(owner: str, product_id: str) -> bool:
    """Return True when the product ends up favorited."""

    now = int(time.time())
    with connect() as connection:
        existing = connection.execute(
            "SELECT 1 FROM article_favorites WHERE owner_key=? AND product_id=?",
            (owner, product_id),
        ).fetchone()
        if existing:
            connection.execute(
                "DELETE FROM article_favorites WHERE owner_key=? AND product_id=?",
                (owner, product_id),
            )
            connection.commit()
            return False
        connection.execute(
            "INSERT INTO article_favorites(owner_key, product_id, created_at) VALUES (?,?,?)",
            (owner, product_id, now),
        )
        connection.commit()
        return True


def migrate_owner(old_owner: str, new_owner: str) -> None:
    """Carry an anonymous cart across a sign-in session rotation."""

    if old_owner == new_owner:
        return
    with connect() as connection:
        connection.execute(
            "UPDATE OR IGNORE article_cart_items SET owner_key=? WHERE owner_key=?",
            (new_owner, old_owner),
        )
        connection.execute("DELETE FROM article_cart_items WHERE owner_key=?", (old_owner,))
        connection.commit()