"""
Shared fixtures for the baton backend test suite.

IMPORTANT: Environment variables and the aiosqlite monkey-patch must be
applied before any backend module is imported.  This module is loaded first
by pytest and all assignments happen at module-level.

Python 3.14 incompatibility with aiosqlite <= 0.22.1:
  Connection.__await__ unconditionally calls self._thread.start().
  When 'async with await conn' is used, the thread is already running by
  the time __aenter__ tries to start it again → RuntimeError.
  The monkey-patch below guards the start so threads are only started once.
"""
from __future__ import annotations

import os

# ── 1. Env vars — must precede all backend imports ──────────────────────────
os.environ.setdefault("BOT_TOKEN", "test-bot-token")
os.environ.setdefault("CHAT_ID", "-1001234567890")
os.environ.setdefault("WEBHOOK_SECRET", "test-webhook-secret")
os.environ.setdefault("WEBHOOK_URL", "https://example.com/api/webhook/telegram")
os.environ.setdefault("FRONTEND_ORIGIN", "http://localhost:3000")
os.environ.setdefault("ADMIN_TOKEN", "test-admin-token")

# ── 2. aiosqlite monkey-patch ────────────────────────────────────────────────
import aiosqlite

def _safe_aiosqlite_await(self):          # type: ignore[override]
    """Start the worker thread only if it has not been started yet."""
    if not self._thread._started.is_set():
        self._thread.start()
    return self._connect().__await__()

aiosqlite.core.Connection.__await__ = _safe_aiosqlite_await  # type: ignore[method-assign]

# ── 3. Normal imports ────────────────────────────────────────────────────────
import tempfile
import contextlib
from typing import AsyncGenerator

import httpx
import pytest
import pytest_asyncio
import respx
from httpx import AsyncClient, ASGITransport

from backend import config


# ── 4. DB-path helper ────────────────────────────────────────────────────────

@contextlib.contextmanager
def temp_db():
    """Context manager that sets config.DB_PATH to a temp file and cleans up."""
    path = tempfile.mktemp(suffix=".db")
    original = config.DB_PATH
    config.DB_PATH = path
    try:
        yield path
    finally:
        config.DB_PATH = original
        for ext in ("", "-wal", "-shm"):
            try:
                os.unlink(path + ext)
            except FileNotFoundError:
                pass


# ── 5. App client factory ────────────────────────────────────────────────────

def make_app_client():
    """
    Async context manager that:
    1. Assigns a fresh temp-file DB path
    2. Mocks Telegram setWebhook and sendMessage
    3. Runs the FastAPI lifespan (startup → test → shutdown)
    4. Yields an httpx.AsyncClient wired to the app
    """
    tg_set_url = f"https://api.telegram.org/bot{config.BOT_TOKEN}/setWebhook"
    send_url = f"https://api.telegram.org/bot{config.BOT_TOKEN}/sendMessage"

    @contextlib.asynccontextmanager
    async def _ctx():
        with temp_db():
            from backend.main import app

            mock_router = respx.mock(assert_all_called=False)
            mock_router.post(tg_set_url).mock(
                return_value=httpx.Response(200, json={"ok": True, "result": True})
            )
            mock_router.post(send_url).mock(
                return_value=httpx.Response(200, json={"ok": True})
            )

            with mock_router:
                async with app.router.lifespan_context(app):
                    transport = ASGITransport(app=app)
                    async with AsyncClient(
                        transport=transport, base_url="http://testserver"
                    ) as client:
                        yield client

    return _ctx()