"""provider OAuth(PKCE) 서비스 단위 테스트 — 실제 네트워크 호출 없음."""

import unittest
from types import SimpleNamespace
from unittest.mock import patch

from app.services import provider_oauth as svc


class _FakeResponse:
    def __init__(self, payload, status_code=200):
        self._payload = payload
        self.status_code = status_code

    def raise_for_status(self):
        if self.status_code >= 400:
            import httpx

            raise httpx.HTTPStatusError("err", request=None, response=None)

    def json(self):
        return self._payload


class _FakeAsyncClient:
    def __init__(self, payload):
        self._payload = payload
        self.captured = {}

    async def __aenter__(self):
        return self

    async def __aexit__(self, *exc):
        return None

    async def post(self, url, **kwargs):
        self.captured = {"url": url, **kwargs}
        return _FakeResponse(self._payload)


class StartOAuthTest(unittest.TestCase):
    def setUp(self):
        svc._PENDING.clear()

    def tearDown(self):
        svc._PENDING.clear()

    def test_unsupported_provider_rejected(self):
        with self.assertRaises(svc.ProviderCredentialError):
            svc.start_oauth("codex", "admin@example.com")

    def test_claude_authorize_url_contains_pkce_and_state(self):
        result = svc.start_oauth("claude", "admin@example.com")
        self.assertIn("https://claude.ai/oauth/authorize", result["authorize_url"])
        self.assertIn("code_challenge_method=S256", result["authorize_url"])
        self.assertIn(f"&state={result['state']}", result["authorize_url"])
        self.assertIn("user%3Ainference", result["authorize_url"])
        self.assertIn(result["state"], svc._PENDING)

    def test_openrouter_authorize_url_is_headless(self):
        result = svc.start_oauth("openrouter", "admin@example.com")
        self.assertIn("https://openrouter.ai/auth?", result["authorize_url"])
        self.assertIn("code_challenge_method=S256", result["authorize_url"])
        self.assertNotIn("callback_url", result["authorize_url"])

    def test_pending_expires(self):
        import time

        result = svc.start_oauth("claude", "admin@example.com")
        attempt = svc._PENDING[result["state"]]
        stale = svc._PendingOAuth(
            provider=attempt.provider,
            code_verifier=attempt.code_verifier,
            created_by=attempt.created_by,
            created_at=time.time() - svc.OAUTH_PENDING_TTL_SECONDS - 1,
        )
        svc._PENDING[result["state"]] = stale
        with self.assertRaises(svc.ProviderCredentialError):
            svc._pop_pending("claude", result["state"])


class FinishOAuthTest(unittest.IsolatedAsyncioTestCase):
    def setUp(self):
        svc._PENDING.clear()

    def tearDown(self):
        svc._PENDING.clear()

    async def test_claude_code_state_exchange_and_save(self):
        start = svc.start_oauth("claude", "admin@example.com")
        fake = _FakeAsyncClient({"access_token": "sk-ant-oat-token-abc", "expires_in": 31536000})
        with patch.object(svc.httpx, "AsyncClient", return_value=fake), patch.object(
            svc, "save_credential"
        ) as save, patch.object(svc, "push_credentials_to_gateway") as push:
            save.return_value = SimpleNamespace(
                provider="claude", token_hint="…oat", auth_kind="oauth_token",
                updated_by="admin@example.com", updated_at=1.0,
            )
            push.return_value = {"synced": True}
            result = await svc.finish_oauth(
                "claude", f"auth-code-123#{start['state']}", start["state"], "admin@example.com"
            )
        self.assertEqual(result["stored"].auth_kind, "oauth_token")
        sent = fake.captured["json"]
        self.assertEqual(sent["grant_type"], "authorization_code")
        self.assertEqual(sent["code"], "auth-code-123")
        self.assertIn("code_verifier", sent)
        self.assertEqual(fake.captured["url"], svc._CLAUDE_OAUTH["token_url"])

    async def test_state_mismatch_rejected(self):
        start = svc.start_oauth("claude", "admin@example.com")
        with self.assertRaises(svc.ProviderCredentialError):
            await svc.finish_oauth("claude", "code#other-state", start["state"], "a@b.com")

    async def test_openrouter_code_exchange_returns_api_key(self):
        start = svc.start_oauth("openrouter", "admin@example.com")
        fake = _FakeAsyncClient({"key": "sk-or-v1-oauth-key"})
        with patch.object(svc.httpx, "AsyncClient", return_value=fake), patch.object(
            svc, "save_credential"
        ) as save, patch.object(svc, "push_credentials_to_gateway") as push:
            save.return_value = SimpleNamespace(
                provider="openrouter", token_hint="…key", auth_kind="api_key",
                updated_by="admin@example.com", updated_at=1.0,
            )
            push.return_value = {"synced": True}
            result = await svc.finish_oauth(
                "openrouter", "or-code-xyz", start["state"], "admin@example.com"
            )
        self.assertEqual(result["stored"].auth_kind, "api_key")
        self.assertEqual(fake.captured["url"], svc._OPENROUTER_OAUTH["exchange_url"])
        self.assertEqual(fake.captured["json"]["code"], "or-code-xyz")
        self.assertEqual(fake.captured["json"]["code_challenge_method"], "S256")


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