"""
Tests for BATON-FIX-013: CORS allow_methods — добавить GET для /health эндпоинтов.

Acceptance criteria:
1. CORSMiddleware в main.py содержит "GET" в allow_methods.
2. OPTIONS preflight /health с Origin и Access-Control-Request-Method: GET
   возвращает 200/204 и содержит GET в Access-Control-Allow-Methods.
3. OPTIONS preflight /api/health — аналогично.
4. GET /health возвращает 200 (regression guard vs. allow_methods=['POST'] only).
"""
from __future__ import annotations

import os

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")
os.environ.setdefault("ADMIN_CHAT_ID", "5694335584")

import pytest

from tests.conftest import make_app_client

_ORIGIN = "http://localhost:3000"
# allow_headers = ["Content-Type", "Authorization"] — X-Custom-Header не разрешён,
# поэтому preflight с X-Custom-Header вернёт 400. Используем Content-Type.
_PREFLIGHT_HEADER = "Content-Type"


# ---------------------------------------------------------------------------
# Criterion 1 — Static: CORSMiddleware.allow_methods must contain "GET"
# ---------------------------------------------------------------------------


def test_cors_middleware_allow_methods_contains_get() -> None:
    """app.user_middleware CORSMiddleware должен содержать 'GET' в allow_methods."""
    from fastapi.middleware.cors import CORSMiddleware

    from backend.main import app

    cors_mw = next(
        (m for m in app.user_middleware if m.cls is CORSMiddleware), None
    )
    assert cors_mw is not None, "CORSMiddleware не найден в app.user_middleware"
    allow_methods = cors_mw.kwargs.get("allow_methods", [])
    assert "GET" in allow_methods, (
        f"CORSMiddleware.allow_methods={allow_methods!r} не содержит 'GET'"
    )


def test_cors_middleware_allow_methods_contains_head() -> None:
    """allow_methods должен содержать 'HEAD' для корректной работы preflight."""
    from fastapi.middleware.cors import CORSMiddleware

    from backend.main import app

    cors_mw = next(
        (m for m in app.user_middleware if m.cls is CORSMiddleware), None
    )
    assert cors_mw is not None
    allow_methods = cors_mw.kwargs.get("allow_methods", [])
    assert "HEAD" in allow_methods, (
        f"CORSMiddleware.allow_methods={allow_methods!r} не содержит 'HEAD'"
    )


def test_cors_middleware_allow_methods_contains_options() -> None:
    """allow_methods должен содержать 'OPTIONS' для корректной обработки preflight."""
    from fastapi.middleware.cors import CORSMiddleware

    from backend.main import app

    cors_mw = next(
        (m for m in app.user_middleware if m.cls is CORSMiddleware), None
    )
    assert cors_mw is not None
    allow_methods = cors_mw.kwargs.get("allow_methods", [])
    assert "OPTIONS" in allow_methods, (
        f"CORSMiddleware.allow_methods={allow_methods!r} не содержит 'OPTIONS'"
    )


# ---------------------------------------------------------------------------
# Criterion 2 — Preflight OPTIONS /health includes GET in Allow-Methods
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_health_preflight_options_returns_success_status() -> None:
    """OPTIONS preflight /health должен вернуть 200 или 204."""
    async with make_app_client() as client:
        response = await client.options(
            "/health",
            headers={
                "Origin": _ORIGIN,
                "Access-Control-Request-Method": "GET",
                "Access-Control-Request-Headers": _PREFLIGHT_HEADER,
            },
        )
    assert response.status_code in (200, 204), (
        f"OPTIONS /health вернул {response.status_code}, ожидался 200 или 204"
    )


@pytest.mark.asyncio
async def test_health_preflight_options_allow_methods_contains_get() -> None:
    """OPTIONS preflight /health: Access-Control-Allow-Methods должен содержать GET."""
    async with make_app_client() as client:
        response = await client.options(
            "/health",
            headers={
                "Origin": _ORIGIN,
                "Access-Control-Request-Method": "GET",
                "Access-Control-Request-Headers": _PREFLIGHT_HEADER,
            },
        )
    allow_methods_header = response.headers.get("access-control-allow-methods", "")
    assert "GET" in allow_methods_header, (
        f"Access-Control-Allow-Methods={allow_methods_header!r} не содержит 'GET'"
    )


# ---------------------------------------------------------------------------
# Criterion 3 — Preflight OPTIONS /api/health includes GET in Allow-Methods
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_api_health_preflight_options_returns_success_status() -> None:
    """OPTIONS preflight /api/health должен вернуть 200 или 204."""
    async with make_app_client() as client:
        response = await client.options(
            "/api/health",
            headers={
                "Origin": _ORIGIN,
                "Access-Control-Request-Method": "GET",
                "Access-Control-Request-Headers": _PREFLIGHT_HEADER,
            },
        )
    assert response.status_code in (200, 204), (
        f"OPTIONS /api/health вернул {response.status_code}, ожидался 200 или 204"
    )


@pytest.mark.asyncio
async def test_api_health_preflight_options_allow_methods_contains_get() -> None:
    """OPTIONS preflight /api/health: Access-Control-Allow-Methods должен содержать GET."""
    async with make_app_client() as client:
        response = await client.options(
            "/api/health",
            headers={
                "Origin": _ORIGIN,
                "Access-Control-Request-Method": "GET",
                "Access-Control-Request-Headers": _PREFLIGHT_HEADER,
            },
        )
    allow_methods_header = response.headers.get("access-control-allow-methods", "")
    assert "GET" in allow_methods_header, (
        f"Access-Control-Allow-Methods={allow_methods_header!r} не содержит 'GET'"
    )


# ---------------------------------------------------------------------------
# Criterion 4 — GET /health returns 200 (regression guard)
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_health_get_returns_200_regression_guard() -> None:
    """GET /health должен вернуть 200 — regression guard против allow_methods=['POST'] only."""
    async with make_app_client() as client:
        response = await client.get(
            "/health",
            headers={"Origin": _ORIGIN},
        )
    assert response.status_code == 200, (
        f"GET /health вернул {response.status_code}, ожидался 200"
    )


@pytest.mark.asyncio
async def test_api_health_get_returns_200_regression_guard() -> None:
    """GET /api/health должен вернуть 200 — regression guard против allow_methods=['POST'] only."""
    async with make_app_client() as client:
        response = await client.get(
            "/api/health",
            headers={"Origin": _ORIGIN},
        )
    assert response.status_code == 200, (
        f"GET /api/health вернул {response.status_code}, ожидался 200"
    )