"""Integration tests for the CORS configuration in :mod:`tavolo.app`.

The mixin under test is kaya-cors' :class:`~kaya.cors.CorsMixin`; these
tests only verify that :func:`tavolo.app.cors_mixin_from_settings` maps the
environment-driven :class:`~tavolo.config.Settings` onto it correctly. A
minimal ``KayaApp`` is used instead of the global ``app`` so the tests do
not depend on the environment the suite was imported with.
"""
from __future__ import annotations

import os
import unittest
from unittest.mock import patch

from httpx import ASGITransport, AsyncClient
from kaya.core import HttpContext, KayaApp
from pwo import async_test

from tavolo.app import cors_mixin_from_settings
from tavolo.config import Settings

ORIGIN = "https://cards.example"


def _settings(env: dict) -> Settings:
    with patch.dict(os.environ, env, clear=True):
        return Settings.from_env()


def _app(settings: Settings) -> KayaApp:
    mixin = cors_mixin_from_settings(settings)
    assert mixin is not None
    app = KayaApp(mixins=[mixin])

    @app.GET("/api/health")
    async def health(ctx: HttpContext) -> None:
        await ctx.send_str(200, "ok")

    return app


class CorsMixinFromSettingsTests(unittest.TestCase):
    def test_disabled_when_unconfigured(self):
        self.assertIsNone(cors_mixin_from_settings(_settings({})))

    def test_enabled_by_allow_origins(self):
        self.assertIsNotNone(cors_mixin_from_settings(
            _settings({"CORS_ALLOW_ORIGINS": ORIGIN})))

    def test_enabled_by_allow_origin_regex_alone(self):
        self.assertIsNotNone(cors_mixin_from_settings(
            _settings({"CORS_ALLOW_ORIGIN_REGEX": r"https://.*\.example\.com"})))


class CorsBehaviorTests(unittest.TestCase):
    @async_test
    async def test_request_without_origin_is_untouched(self) -> None:
        app = _app(_settings({"CORS_ALLOW_ORIGINS": ORIGIN}))
        async with AsyncClient(transport=ASGITransport(app=app),
                               base_url="http://127.0.0.1") as client:
            response = await client.get("/api/health")
            self.assertEqual(200, response.status_code)
            self.assertNotIn("access-control-allow-origin", response.headers)

    @async_test
    async def test_simple_request_with_allowed_origin(self) -> None:
        app = _app(_settings({"CORS_ALLOW_ORIGINS": ORIGIN}))
        async with AsyncClient(transport=ASGITransport(app=app),
                               base_url="http://127.0.0.1") as client:
            response = await client.get("/api/health", headers={"Origin": ORIGIN})
            self.assertEqual(200, response.status_code)
            self.assertEqual(ORIGIN, response.headers["access-control-allow-origin"])

    @async_test
    async def test_simple_request_with_disallowed_origin(self) -> None:
        app = _app(_settings({"CORS_ALLOW_ORIGINS": ORIGIN}))
        async with AsyncClient(transport=ASGITransport(app=app),
                               base_url="http://127.0.0.1") as client:
            response = await client.get(
                "/api/health", headers={"Origin": "https://mallory.example"})
            self.assertEqual(200, response.status_code)
            self.assertNotIn("access-control-allow-origin", response.headers)

    @async_test
    async def test_preflight_allowed(self) -> None:
        app = _app(_settings({
            "CORS_ALLOW_ORIGINS": ORIGIN,
            "CORS_ALLOW_METHODS": "GET,POST",
            "CORS_MAX_AGE": "3600",
        }))
        async with AsyncClient(transport=ASGITransport(app=app),
                               base_url="http://127.0.0.1") as client:
            response = await client.options("/api/health", headers={
                "Origin": ORIGIN,
                "Access-Control-Request-Method": "POST",
            })
            self.assertEqual(200, response.status_code)
            self.assertEqual(ORIGIN, response.headers["access-control-allow-origin"])
            self.assertEqual("GET, POST", response.headers["access-control-allow-methods"])
            self.assertEqual("3600", response.headers["access-control-max-age"])

    @async_test
    async def test_preflight_disallowed_origin(self) -> None:
        app = _app(_settings({"CORS_ALLOW_ORIGINS": ORIGIN}))
        async with AsyncClient(transport=ASGITransport(app=app),
                               base_url="http://127.0.0.1") as client:
            response = await client.options("/api/health", headers={
                "Origin": "https://mallory.example",
                "Access-Control-Request-Method": "GET",
            })
            self.assertEqual(400, response.status_code)
            self.assertIn("Disallowed CORS", response.text)

    @async_test
    async def test_credentials_echo_origin_and_set_flag(self) -> None:
        app = _app(_settings({
            "CORS_ALLOW_ORIGINS": "*",
            "CORS_ALLOW_CREDENTIALS": "true",
        }))
        async with AsyncClient(transport=ASGITransport(app=app),
                               base_url="http://127.0.0.1") as client:
            response = await client.get("/api/health", headers={"Origin": ORIGIN})
            self.assertEqual(200, response.status_code)
            self.assertEqual(ORIGIN, response.headers["access-control-allow-origin"])
            self.assertEqual("true", response.headers["access-control-allow-credentials"])


if __name__ == "__main__":
    unittest.main()