"""OpenRouter 어댑터와 provider 인증 헤더 판정 테스트."""

import os
import unittest
from unittest.mock import AsyncMock, patch

from app.contracts.engine_gateway import GenerateRequest, EngineMessage
from engine_gateway import provider_registry


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

    def raise_for_status(self):
        return 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 get(self, url, **kwargs):
        self.captured = {"method": "get", "url": url, **kwargs}
        return _FakeResponse(self._payload)

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


class AnthropicHeaderTest(unittest.TestCase):
    def tearDown(self):
        provider_registry._PROVIDER_AUTH_KINDS.clear()

    def test_api_key_uses_x_api_key(self):
        headers = provider_registry._anthropic_headers("sk-ant-api03-x")
        self.assertEqual(headers["x-api-key"], "sk-ant-api03-x")
        self.assertNotIn("Authorization", headers)

    def test_oauth_token_uses_bearer(self):
        provider_registry.set_provider_auth_kind("claude", "oauth_token")
        headers = provider_registry._anthropic_headers("oauth-token")
        self.assertEqual(headers["Authorization"], "Bearer oauth-token")
        self.assertNotIn("x-api-key", headers)


class DiscoverOpenRouterTest(unittest.IsolatedAsyncioTestCase):
    async def test_live_models_without_allowlist(self):
        fake = _FakeAsyncClient(
            {
                "data": [
                    {
                        "id": "anthropic/claude-sonnet-4.5",
                        "name": "Claude Sonnet 4.5",
                        "pricing": {"prompt": "0.000003", "completion": "0.000015"},
                    },
                    {
                        "id": "meta-llama/free-8b",
                        "name": "Free 8B",
                        "pricing": {"prompt": "0", "completion": "0"},
                    },
                ]
            }
        )
        with patch.dict(os.environ, {"OPENROUTER_API_KEY": "sk-or-key"}, clear=False):
            with patch.object(provider_registry.httpx, "AsyncClient", return_value=fake):
                result = await provider_registry._discover_openrouter()
        self.assertTrue(result.available)
        self.assertEqual(result.provider, "openrouter")
        self.assertEqual(result.source, "live_api")
        self.assertEqual(result.default_model, "anthropic/claude-sonnet-4.5")
        self.assertIn("Bearer sk-or-key", fake.captured["headers"]["Authorization"])
        free = next(m for m in result.models if m.id == "meta-llama/free-8b")
        self.assertIn("무료", free.description)

    async def test_missing_key_is_unavailable(self):
        with patch.dict(os.environ, {"OPENROUTER_API_KEY": ""}, clear=False):
            result = await provider_registry._discover_openrouter()
        self.assertFalse(result.available)

    async def test_allowlist_must_use_vendor_slash_model(self):
        with patch.dict(
            os.environ,
            {"OPENROUTER_API_KEY": "sk-or-key", "OPENROUTER_ENGINE_MODELS": "gpt-4o"},
            clear=False,
        ):
            result = await provider_registry._discover_openrouter()
        self.assertFalse(result.available)
        self.assertIn("vendor/model", result.detail)


class GenerateOpenRouterTest(unittest.IsolatedAsyncioTestCase):
    async def test_chat_completions_roundtrip(self):
        fake = _FakeAsyncClient(
            {
                "model": "anthropic/claude-sonnet-4.5",
                "choices": [
                    {"message": {"role": "assistant", "content": "안녕하세요."}}
                ],
                "usage": {"prompt_tokens": 12, "completion_tokens": 5},
            }
        )
        req = GenerateRequest(
            ai_role="client",
            messages=[EngineMessage(role="user", content="hi")],
            provider="openrouter",
            model="anthropic/claude-sonnet-4.5",
        )
        with patch.dict(os.environ, {"OPENROUTER_API_KEY": "sk-or-key"}, clear=False):
            with patch.object(provider_registry.httpx, "AsyncClient", return_value=fake):
                with patch.object(
                    provider_registry,
                    "_resolve_selection",
                    AsyncMock(return_value=("anthropic/claude-sonnet-4.5", None)),
                ):
                    result = await provider_registry.generate_with_provider(
                        req, system_prompt="sys", user_payload="사용자 입력"
                    )
        self.assertEqual(result.provider, "openrouter")
        self.assertEqual(result.text, "안녕하세요.")
        self.assertEqual(result.tokens_in, 12)
        self.assertEqual(result.tokens_out, 5)
        self.assertTrue(fake.captured["url"].endswith("/chat/completions"))
        payload = fake.captured["json"]
        self.assertEqual(payload["messages"][0]["role"], "system")
        self.assertEqual(payload["messages"][1]["content"], "사용자 입력")


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