import asyncio
import unittest
from unittest.mock import patch

from models.ai_client import AIClient, ProviderConfig, ProviderUnavailableError


class _FailingCompletions:
    def create(self, **_kwargs):
        raise RuntimeError("quota exhausted")


class _FailingChat:
    completions = _FailingCompletions()


class _FailingClient:
    chat = _FailingChat()


class _ClientWithFailingProviders(AIClient):
    def __init__(self):
        self.providers = [
            ProviderConfig(name="primary", api_key="x", base_url="https://example.invalid", default_model="model-a"),
            ProviderConfig(name="fallback", api_key="y", base_url="https://example.invalid", default_model="model-b"),
        ]
        self._client_cache = {}
        self._rr_indices = {}
        # Stato minimo richiesto dai percorsi chat/stream dopo l’introduzione
        # del circuit breaker per profilo. Non chiama AIClient.__init__ e non
        # carica provider o segreti dall’ambiente.
        self._breaker = {}
        self._breaker_threshold = 2
        self._breaker_cooldown_s = 60.0

    def _client_for(self, _provider):
        return _FailingClient()


class ProviderUnavailableTests(unittest.IsolatedAsyncioTestCase):
    async def test_chat_raises_structured_error_when_every_provider_fails(self):
        client = _ClientWithFailingProviders()

        with self.assertRaises(ProviderUnavailableError) as raised:
            await client.chat([{"role": "user", "content": "hello"}], max_tokens=8)

        self.assertCountEqual(raised.exception.providers, ("primary", "fallback"))
        self.assertNotIn("api_key", str(raised.exception).lower())

    async def test_stream_chat_raises_structured_error_when_every_provider_fails(self):
        client = _ClientWithFailingProviders()

        with self.assertRaises(ProviderUnavailableError) as raised:
            async for _ in client.stream_chat([{"role": "user", "content": "hello"}], max_tokens=8):
                pass

        self.assertCountEqual(raised.exception.providers, ("primary", "fallback"))
        self.assertNotIn("api_key", str(raised.exception).lower())

    async def test_stream_chat_expands_a_role_specific_provider_pool(self):
        client = _ClientWithFailingProviders()
        client.providers = [
            ProviderConfig(name="gemini-role", api_key="x", base_url="https://example.invalid", default_model="gemini")
        ]
        runtime_fallback = ProviderConfig(
            name="nvidia", api_key="y", base_url="https://fallback.invalid", default_model="nemotron"
        )

        with patch.object(client, "_load_providers", return_value=[runtime_fallback]):
            with self.assertRaises(ProviderUnavailableError) as raised:
                async for _ in client.stream_chat([{"role": "user", "content": "hello"}], max_tokens=8):
                    pass

        self.assertCountEqual(raised.exception.providers, ("gemini-role", "nvidia"))


class RuntimeModelOverrideTests(unittest.TestCase):
    def test_groq_runtime_model_overrides_database_model(self):
        row = {
            "base_url": "https://api.groq.com/openai/v1",
            "default_model": "llama-3.3-70b-versatile",
        }
        with patch.dict("os.environ", {"GROQ_MODEL": "openai/gpt-oss-120b"}, clear=False):
            self.assertEqual(
                AIClient._runtime_model_override(row),
                "openai/gpt-oss-120b",
            )

    def test_unknown_provider_keeps_database_model(self):
        row = {"base_url": "https://example.invalid/v1", "default_model": "custom-model"}
        self.assertEqual(AIClient._runtime_model_override(row), "custom-model")


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