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

import json
import os
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 = "insureon"
DATABASE_NAME = "insureon.sqlite3"
data_dir = Path(os.environ["DATA_DIR"]).resolve()
migration_version = 1
REQUIRED_INVARIANTS = (
    "insureon.frozen-route-closure",
    "insureon.account-business-isolation",
    "insureon.mailpit-only-mail",
    "insureon.local-sandbox-policy-payment",
)
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")
    subject = str(declared["subject"])
    lead = str(declared["lead"])
    body = str(declared["body"]).replace("${code}", code)
    expiry = str(declared["expiry"]).replace("${minutes}", "15")
    footer = str(declared["footer"])
    text = "\n\n".join((lead, body, expiry, footer))
    payload = json.dumps(
        {"from": sender, "to": recipient, "subject": 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(
    "insureon_mailpit_delivery", 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:
    """Formal direct flows never create clone-local mail rows."""

    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:
    """Keep the generated OTP only in the active call frame until delivery."""

    active = _active_delivery.get()
    if active is not None:
        active.update({"purpose": purpose, "flow_id": flow_id, "code": code})
    else:
        raise RuntimeError("mail code capture requires an active Mailpit delivery")


def _disable_local_reader(
    self: LocalAuthStore, session_token: str, *, purpose: str
) -> None:
    """Candidate code has no mail-reading surface."""

    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, _seed_fixtures  # noqa: E402

# The clone's own diagnostic seed establishes a deterministic public quote
# fixture used by the trusted business/payment route probes.
_seed_fixtures()


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 in {"/api/account/local-mail", "/account/local-mail"}:
        return _headers(
            JSONResponse({"error": "mail-reader-disabled"}, status_code=404)
        )
    return _headers(await call_next(request))


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",
    )