#!/usr/bin/env python3
"""Single-process Harbor adapter for the frozen Curology clone.

Registration and password-recovery mail is written only to the trial-scoped
Mailpit SMTP writer injected by the harness. The candidate receives write
coordinates alone; the verifier reads the message through ``mailbox_code``.
"""

from __future__ import annotations

import hmac
import os
import random
import sys
import time
from pathlib import Path

import secrets
import smtplib
from email.message import EmailMessage


ROOT = Path(__file__).resolve().parent
SITE_ID = "curology"
DATABASE_NAME = "curology.sqlite3"
DISPLAY_NAME = "Curology"
MAIL_TRANSPORT_CONTRACT = "WEBSITEBENCH_MAILPIT_DIRECT_WRITER_V1"
health_contract = "/healthz"
migration_version = 1
required_invariants = ('frozen-route-closure', 'loopback-runtime', 'local-mail')
PAYMENT_ADAPTER = "local-sandbox"
payment_profile = "local-sandbox"

for _name in ("HOST", "PORT", "DATA_DIR", "SEED", "TZ"):
    if not os.environ.get(_name):
        raise SystemExit(f"{_name} is required")
data_dir = Path(os.environ["DATA_DIR"])
if not data_dir.is_absolute():
    raise SystemExit("DATA_DIR must be absolute")
data_dir.mkdir(parents=True, exist_ok=True)
try:
    random.seed(int(os.environ["SEED"]))
except ValueError:
    raise SystemExit("SEED must be an integer") from None
if hasattr(time, "tzset"):
    time.tzset()

os.environ["WEBSITEBENCH_SITE_BACKEND_DATABASE"] = str(data_dir / DATABASE_NAME)
os.environ["WEBSITEBENCH_SITE_BACKEND_RUNTIME"] = str(ROOT / "backend" / "runtime.json")
os.environ["WEBSITEBENCH_DEPLOYMENT_PROFILE"] = "offline-harbor"
os.environ["WEBSITEBENCH_PAYMENT_PROFILE"] = PAYMENT_ADAPTER
os.environ["WEBSITEBENCH_LOCAL_HTTP_COOKIE"] = "1"
os.environ["WEBSITEBENCH_HARBOR_MIGRATION_VERSION"] = str(migration_version)
os.environ["PYTHONDONTWRITEBYTECODE"] = "1"
for _name in (
    "STRIPE_SECRET_KEY",
    "STRIPE_WEBHOOK_SECRET",
    "STRIPE_TEST_SECRET_KEY",
    "STRIPE_TEST_WEBHOOK_SECRET",
):
    os.environ.pop(_name, None)

sys.dont_write_bytecode = True
sys.path.insert(0, str(ROOT / "vendor"))
sys.path.insert(0, str(ROOT / "clone"))
# The frozen clone resolves its own static mounts relative to the process
# working directory, so the adapter enters the clone tree rather than
# rewriting a pinned path.
os.chdir(ROOT / "clone")

import websitebench.local_clone_auth as auth_package  # noqa: E402
from websitebench.local_clone_auth import store as auth_store  # noqa: E402
from websitebench.local_clone_auth import (  # noqa: E402
    MAIL_SMTP_PENDING,
    AuthError,
)

_BASE_AUTH_STORE = auth_store.LocalAuthStore
_MAIL_WORKER_TOKEN = secrets.token_urlsafe(48)


class MailpitAuthStore(_BASE_AUTH_STORE):
    """Deliver auth challenges only through the injected Mailpit SMTP writer."""

    def __init__(self, database_path, **kwargs):
        kwargs["mail_mode"] = MAIL_SMTP_PENDING
        kwargs["mail_worker_token"] = _MAIL_WORKER_TOKEN
        super().__init__(database_path, **kwargs)

    def _smtp_coordinates(self) -> tuple[str, int, str] | None:
        host = os.environ.get("WEBSITEBENCH_SMTP_HOST", "")
        raw_port = os.environ.get("WEBSITEBENCH_SMTP_PORT", "")
        sender = os.environ.get("WEBSITEBENCH_SMTP_FROM", "")
        if not host and not raw_port and not sender:
            # No trial mailbox writer is advertised at all. That is a
            # deployment without a Mailpit sidecar, not a rejected account:
            # the public registration transition still has to succeed and the
            # challenge simply stays pending until a writer appears.
            return None
        if host not in {"127.0.0.1", "localhost"}:
            raise AuthError("trial mailbox SMTP writer is unavailable")
        try:
            port = int(raw_port)
        except ValueError as error:
            raise AuthError("trial mailbox SMTP writer is unavailable") from error
        if not 1 <= port <= 65535 or not sender.endswith(
            "@candidate.websitebench.local"
        ):
            raise AuthError("trial mailbox SMTP writer is unavailable")
        return host, port, sender

    def _deliver_mailpit(
        self, session_token: str, *, purpose: str, subject: str
    ) -> None:
        coordinates = self._smtp_coordinates()
        if coordinates is None:
            return
        host, port, sender = coordinates
        claim = self.claim_pending_mail_for_session(
            session_token,
            purpose=purpose,
            worker_token=_MAIL_WORKER_TOKEN,
        )
        # Password reset stays non-enumerating: an unknown account produces no
        # message but follows the same browser transition.
        if claim is None:
            return
        mail_id = int(claim["mail_id"])
        claim_token = str(claim["claim_token"])
        self.reserve_mail_target_request(
            mail_id, claim_token, worker_token=_MAIL_WORKER_TOKEN
        )
        message = EmailMessage()
        message["From"] = sender
        message["To"] = str(claim["recipient"])
        message["Subject"] = subject
        message.set_content(
            f"Your {DISPLAY_NAME} {purpose} code is {claim['verification_code']}."
        )
        try:
            with smtplib.SMTP(host, port, timeout=10) as smtp:
                refused = smtp.send_message(message)
            if refused:
                raise OSError("Mailpit rejected a trial recipient")
        except (OSError, smtplib.SMTPException) as error:
            self.finish_mail_claim(
                mail_id,
                claim_token,
                sent=False,
                target_request_count=1,
                accepted_request_count=0,
                error="network",
                worker_token=_MAIL_WORKER_TOKEN,
            )
            raise AuthError("trial mailbox delivery was deferred") from error
        self.finish_mail_claim(
            mail_id,
            claim_token,
            sent=True,
            target_request_count=1,
            accepted_request_count=1,
            worker_token=_MAIL_WORKER_TOKEN,
        )

    def start_registration(self, session_token: str, **kwargs):
        result = super().start_registration(session_token, **kwargs)
        self._deliver_mailpit(
            session_token,
            purpose="registration",
            subject="Verify your Curology account",
        )
        return result

    def start_password_reset(self, session_token: str, **kwargs):
        result = super().start_password_reset(session_token, **kwargs)
        self._deliver_mailpit(
            session_token,
            purpose="password-reset",
            subject="Reset your Curology password",
        )
        return result


# The clone reaches its store through ``open_site_services``, which binds
# ``LocalAuthStore`` by name at import time. Rebinding both the module and the
# package export before the clone is imported redirects every construction
# path without touching a frozen byte.
auth_store.LocalAuthStore = MailpitAuthStore
auth_package.LocalAuthStore = MailpitAuthStore

from app import app as app  # noqa: E402
from backend.site_backend_integration import (  # noqa: E402
    open_site_services,
)


def _reset_site_state() -> None:
    """Reset exactly the rows the vendored backend and auth own."""

    backend, auth = open_site_services()

    def _site_reset(connection) -> None:
        backend.lifecycle.reset_embedded(
            connection, confirm_site_id=SITE_ID
        )

    auth.reset_site_state(site_reset=_site_reset, seed_accounts=[])


from fastapi import Request  # noqa: E402
from fastapi.responses import JSONResponse, PlainTextResponse  # noqa: E402

import uvicorn  # noqa: E402


@app.middleware("http")
async def harbor_site_header(request: Request, call_next):
    if request.method == "GET" and request.url.path in {
        "/healthz",
        "/__websitebench/health",
    }:
        response = JSONResponse({"status": "ok"})
    else:
        response = await call_next(request)
    response.headers["X-WebsiteBench-Site"] = SITE_ID
    return response


@app.get("/__websitebench/health", include_in_schema=False)
async def harbor_lifecycle_health() -> JSONResponse:
    """Expose the exact lifecycle body while preserving clone `/healthz`."""

    return JSONResponse({"status": "ok"})


_health_routes = [
    route
    for route in app.router.routes
    if getattr(route, "endpoint", None) is harbor_lifecycle_health
]
for route in _health_routes:
    app.router.routes.remove(route)
app.router.routes[:0] = _health_routes


_ADMIN_TOKEN = os.environ.get("WEBSITEBENCH_ADMIN_TOKEN", "")
_RESET_PATH = "/__admin/reset"


def _declared_routes(router):
    """Yield (path, methods) including lazily included sub-routers.

    FastAPI defers ``include_router`` into an ``_IncludedRouter`` placeholder
    that carries no path until the first request, so a plain scan of
    ``app.router.routes`` reports a clone as owning far fewer routes than it
    does. Follow ``original_router`` so detection sees the real table.
    """

    for route in getattr(router, "routes", ()):
        included = getattr(route, "original_router", None)
        if included is not None:
            yield from _declared_routes(included)
            continue
        path = getattr(route, "path", None)
        if isinstance(path, str):
            yield path, set(getattr(route, "methods", None) or ())


_clone_owns_reset = any(
    path == _RESET_PATH and "POST" in methods
    for path, methods in _declared_routes(app.router)
)

if not _clone_owns_reset:

    @app.post(_RESET_PATH, include_in_schema=False)
    async def harbor_reset(request: Request) -> JSONResponse:
        """Deterministic reset, admin-token guarded like the paired clones.

        Reset authority is never granted to an unauthenticated caller; the
        trial harness isolates state with a fresh ``DATA_DIR`` instead.
        """

        supplied = request.headers.get("X-WebsiteBench-Admin-Token", "")
        if not _ADMIN_TOKEN or not hmac.compare_digest(supplied, _ADMIN_TOKEN):
            return JSONResponse({"error": "forbidden"}, status_code=403)
        _reset_site_state()
        return JSONResponse({"reset": True, "site_id": SITE_ID})

    @app.get(_RESET_PATH, include_in_schema=False)
    async def harbor_reset_get() -> PlainTextResponse:
        return PlainTextResponse("Page not found", status_code=404)

    # A frozen catch-all would otherwise shadow the harness ABI. Move only the
    # two adapter routes to the front; reordering the whole table would also
    # move the clone's own routes relative to each other.
    _added = [
        route
        for route in app.router.routes
        if getattr(route, "path", None) == _RESET_PATH
    ]
    for route in _added:
        app.router.routes.remove(route)
    app.router.routes[:0] = _added

if __name__ == "__main__":
    # The frozen clone builds its service singleton (schema, demo seed, KDF
    # work) lazily on the first page hit, which takes tens of seconds cold.
    # Warm it before serving so the first real request answers promptly.
    import app as _clone_app_module  # noqa: E402

    _clone_app_module.services()
    uvicorn.run(
        app,
        host=os.environ["HOST"],
        port=int(os.environ["PORT"]),
        log_level="warning",
    )