#!/usr/bin/env python3
from __future__ import annotations

import json
import os
import re
import urllib.parse
import urllib.request
from contextvars import ContextVar
from pathlib import Path
from typing import Any

import uvicorn
from fastapi import Request
from starlette.responses import JSONResponse, Response

from websitebench.local_clone_auth.store import LocalAuthStore


ROOT = Path(__file__).resolve().parent
SITE_ID = "ioby"
DATABASE_NAME = "ioby.sqlite3"
data_dir = Path(os.environ["DATA_DIR"]).resolve()
migration_version = 1
REQUIRED_INVARIANTS = (
    "runtime.local-only",
    "project.source-grounded",
    "ioby.mailpit-only-mail",
    "payment.local-sandbox",
    "account.site-isolated",
)
required_invariants = REQUIRED_INVARIANTS
PAYMENT_ADAPTER = "local-sandbox"
MAILPIT_DIRECT_WRITER = "WEBSITEBENCH_MAILPIT_DIRECT_WRITER_V1"
status_code = 200

data_dir.mkdir(parents=True, exist_ok=True)
runtime_contract = json.loads(
    (ROOT / "backend/runtime.json").read_text(encoding="utf-8")
)
if (
    runtime_contract.get("site", {}).get("id") != SITE_ID
    or runtime_contract.get("database", {}).get("filename") != DATABASE_NAME
):
    raise RuntimeError("assembled backend runtime does not match the site contract")


def _mailpit_writer() -> tuple[str, str, str]:
    url = os.environ.get("WEBSITEBENCH_MAIL_API_URL", "").strip()
    token = os.environ.get("WEBSITEBENCH_MAIL_API_TOKEN", "").strip()
    sender = os.environ.get("WEBSITEBENCH_MAIL_FROM", "").strip()
    parsed = urllib.parse.urlsplit(url)
    if (
        parsed.scheme != "http"
        or parsed.hostname not in {"127.0.0.1", "localhost", "::1", "mailbox-internal"}
        or not token
        or not sender
    ):
        raise RuntimeError("Mailpit-backed candidate writer is unavailable")
    return url, token, sender


def _send_code(recipient: str, code: str, purpose: str) -> None:
    url, token, sender = _mailpit_writer()
    declared = runtime_contract.get("mail", {}).get("purposes", {}).get(purpose)
    if not isinstance(declared, dict):
        raise ValueError("unsupported mail purpose")
    text = "\n\n".join(
        (
            str(declared["lead"]),
            str(declared["body"]).replace("${code}", code),
            str(declared["expiry"]).replace("${minutes}", "15"),
            str(declared["footer"]),
        )
    )
    payload = json.dumps(
        {
            "from": sender,
            "to": recipient,
            "subject": str(declared["subject"]),
            "text": text,
        },
        separators=(",", ":"),
    ).encode()
    request = urllib.request.Request(
        url,
        data=payload,
        method="POST",
        headers={
            "Authorization": "Bearer " + token,
            "Content-Type": "application/json",
        },
    )
    with urllib.request.urlopen(request, timeout=5) as response:
        if not 200 <= response.status < 300:
            raise RuntimeError("Mailpit-backed candidate writer rejected message")


_active_delivery: ContextVar[dict[str, str] | None] = ContextVar(
    "ioby_mailpit_delivery", default=None
)
_pending_mail_view: ContextVar[str | None] = ContextVar(
    "ioby_pending_mail_view", default=None
)
_original_start_registration = LocalAuthStore.start_registration
_original_start_password_reset = LocalAuthStore.start_password_reset


def _suppress_outbox(self: LocalAuthStore, *args: Any, **kwargs: Any) -> None:
    if _active_delivery.get() is None:
        raise RuntimeError("mail creation requires an active Mailpit delivery")


def _capture_code(self: LocalAuthStore, purpose: str, flow_id: str, code: str) -> None:
    active = _active_delivery.get()
    if active is None:
        raise RuntimeError("mail code capture requires an active Mailpit delivery")
    active.update({"purpose": purpose, "flow_id": flow_id, "code": code})


def _disable_local_reader(
    self: LocalAuthStore, session_token: str, *, purpose: str
) -> None:
    # The clone calls this legacy seam only to decide which form to render.
    # Preserve that UI transition without reading or returning mail data.
    _pending_mail_view.set(purpose)
    return None


def _start_registration(
    self: LocalAuthStore,
    session_token: str,
    *,
    email: str,
    display_name: str,
    password: str,
    restart_invalid_flow: bool = False,
) -> dict[str, Any]:
    active: dict[str, str] = {}
    context = _active_delivery.set(active)
    try:
        result = _original_start_registration(
            self,
            session_token,
            email=email,
            display_name=display_name,
            password=password,
            restart_invalid_flow=restart_invalid_flow,
        )
        code = active.get("code")
        if not code:
            raise RuntimeError("registration did not generate a Mailpit code")
        _send_code(email.strip().casefold(), code, "registration")
        return {**result, "mail_status": "MAILPIT_SENT"}
    finally:
        active.clear()
        _active_delivery.reset(context)


def _start_password_reset(
    self: LocalAuthStore,
    session_token: str,
    *,
    email: str,
    restart_invalid_flow: bool = False,
) -> dict[str, Any]:
    active: dict[str, str] = {}
    context = _active_delivery.set(active)
    try:
        result = _original_start_password_reset(
            self,
            session_token,
            email=email,
            restart_invalid_flow=restart_invalid_flow,
        )
        code = active.get("code")
        if code is not None:
            _send_code(email.strip().casefold(), code, "password-reset")
        return result
    finally:
        active.clear()
        _active_delivery.reset(context)


LocalAuthStore._insert_mail_unlocked = _suppress_outbox
LocalAuthStore._remember_mail_code = _capture_code
LocalAuthStore.local_mail_for_session = _disable_local_reader
LocalAuthStore.start_registration = _start_registration
LocalAuthStore.start_password_reset = _start_password_reset

from app import APP as app, AUTH, BACKEND  # noqa: E402
from backend import business  # noqa: E402
import views as clone_views  # noqa: E402


_original_register_view = clone_views.register
_original_recover_view = clone_views.recover


def _mailpit_input(markup: str, *, purpose: str) -> str:
    markup = re.sub(
        r'<output class="local-code"[^>]*>MAILPIT_CODE_INPUT</output>',
        (
            '<p class="notice" role="status">Check the isolated Mailpit '
            f"mailbox for the fresh {purpose} code.</p>"
        ),
        markup,
    )
    return (
        markup.replace("LOCAL OUTBOX", "ISOLATED MAILPIT")
        .replace(
            "No email was sent. For this offline simulation, use the code shown below.",
            "A fresh code was sent to the isolated Mailpit mailbox.",
        )
        .replace(
            "No real email is sent. A code is exposed only in this browser's local outbox.",
            "No external email is sent. The fresh code is available only through the isolated Mailpit mailbox.",
        )
        .replace(
            "Verification stays in the local outbox.",
            "Verification uses the isolated Mailpit mailbox.",
        )
    )


def _register_view(*, values: Any = None, error: str = "", code: str = "") -> str:
    pending = _pending_mail_view.get()
    if values or error or code or pending == "registration":
        _pending_mail_view.set(None)
        return _mailpit_input(
            _original_register_view(
                values=values, error=error, code="MAILPIT_CODE_INPUT"
            ),
            purpose="registration",
        )
    return _mailpit_input(_original_register_view(), purpose="registration")


def _recover_view(*, message: str = "", error: str = "", code: str = "") -> str:
    pending = _pending_mail_view.get()
    if message or error or code or pending == "password-reset":
        _pending_mail_view.set(None)
        return _mailpit_input(
            _original_recover_view(
                message=message, error=error, code="MAILPIT_CODE_INPUT"
            ),
            purpose="password-reset",
        )
    return _mailpit_input(_original_recover_view(), purpose="password-reset")


clone_views.register = _register_view
clone_views.recover = _recover_view


def _reset_site() -> None:
    BACKEND.lifecycle.reset(confirm_site_id=SITE_ID)
    BACKEND.lifecycle.initialize()
    AUTH.ensure_schema()
    account_id = AUTH.seed_account(
        subject_id="ioby-demo-neighbor",
        email="demo@ioby.local",
        display_name="Morgan Neighbor",
        password="Neighbor123!",
    )
    with BACKEND.lifecycle.connection(transaction=True) as connection:
        business.migrate(connection)
        business.seed_demo(connection, account_id)


def _headers(response: Response) -> Response:
    response.headers["X-WebsiteBench-Site"] = SITE_ID
    response.headers["X-WebsiteBench-Database"] = DATABASE_NAME
    response.headers["X-WebsiteBench-Migration"] = str(migration_version)
    response.headers["X-WebsiteBench-Invariants"] = ",".join(REQUIRED_INVARIANTS)
    response.headers["X-WebsiteBench-Payment-Adapter"] = PAYMENT_ADAPTER
    response.headers["X-WebsiteBench-Mail-Transport"] = MAILPIT_DIRECT_WRITER
    return response


@app.middleware("http")
async def harbor_contract(request: Request, call_next: Any) -> Response:
    if request.method == "GET" and request.url.path in {
        "/healthz",
        "/__websitebench/health",
    }:
        return _headers(JSONResponse({"status": "ok"}))
    if request.url.path == "/__admin/reset":
        expected = os.environ.get("WEBSITEBENCH_ADMIN_TOKEN", "")
        supplied = request.headers.get("X-WebsiteBench-Admin-Token", "")
        if request.method != "POST" or not expected or supplied != expected:
            return _headers(JSONResponse({"error": "unauthorized"}, status_code=401))
        _reset_site()
        return _headers(JSONResponse({"status": "reset"}))
    response = await call_next(request)
    if status_code != 200 and request.url.path != "/" + "healthz":
        response.status_code = status_code
    return _headers(response)


if __name__ == "__main__":
    uvicorn.run(
        app,
        host=os.environ.get("HOST", "127.0.0.1"),
        port=int(os.environ.get("PORT", "8080")),
        log_level="warning",
    )