"""
Unit tests for AI client components
"""
from unittest import async_case
import pytest
from unittest.mock import Mock, AsyncMock, patch
from mcp_template.llm_client.base_client import BaseAIClient
from mcp_template.llm_client.openai_client import OpenAIClient
from mcp_template.llm_client.client_factory import AIClientFactory


class TestBaseAIClient:
    """Test base AI client functionality"""

    def test_base_client_creation(self):
        """Test creating a base client"""
        # Create a concrete implementation for testing
        class TestAIClient(BaseAIClient):
            async def chat_completion(self, messages, tools=None, **kwargs):
                return {"choices": [{"message": {"content": "test response"}}]}
            
            async def _initialize_client(self):
                pass

        client = TestAIClient(
            model_name="test-model",
            provider="test",
            api_key="test-key"
        )

        assert client.model_name == "test-model"
        assert client._api_key == "test-key"
        assert not client._initialized

    def test_abstract_class_cannot_be_instantiated(self):
        """Test that abstract BaseAIClient cannot be instantiated directly"""
        with pytest.raises(TypeError, match="Can't instantiate abstract class"):
            BaseAIClient(
                model_name="test-model",
                provider="test",
                api_key="test-key"
            )


class TestOpenAIClient:
    """Test OpenAI client implementation"""

    def test_openai_client_creation(self):
        """Test creating an OpenAI client"""
        client = OpenAIClient(
            model_name="gpt-4o",
            api_key="test-key",
            temperature=0.5,
            max_tokens=500
        )

        assert client.model_name == "gpt-4o"
        assert client._temperature == 0.5
        assert client._max_tokens == 500

    def test_openai_client_defaults(self):
        """Test OpenAI client default values"""
        client = OpenAIClient(
            model_name="gpt-4o",
            api_key="test-key"
        )

        assert client._temperature == 0.7
        assert client._max_tokens == 1000

    @patch('mcp_template.llm_client.openai_client.AsyncOpenAI')
    @pytest.mark.asyncio
    async def test_openai_initialization(self, mock_openai_class):
        """Test OpenAI client initialization"""
        mock_client = Mock()
        mock_openai_class.return_value = mock_client

        client = OpenAIClient("gpt-4o", "test-key")
        await client._initialize_client()

        mock_openai_class.assert_called_once_with(api_key="test-key")
        assert client._client == mock_client

    @patch('mcp_template.llm_client.openai_client.AsyncOpenAI')
    @pytest.mark.asyncio
    async def test_openai_chat_completion(self, mock_openai_class):
        """Test OpenAI chat completion"""
        # Mock the OpenAI client and response
        mock_client = Mock()
        mock_response = Mock()
        mock_choice = Mock()
        mock_message = Mock()

        mock_message.role = "assistant"
        mock_message.content = "Test response"
        mock_message.tool_calls = None

        mock_choice.message = mock_message
        mock_response.choices = [mock_choice]

        mock_client.chat.completions.create = AsyncMock(return_value=mock_response)
        mock_openai_class.return_value = mock_client

        client = OpenAIClient("gpt-4o", "test-key")
        await client.initialize()

        messages = [{"role": "user", "content": "Hello"}]
        result = await client.chat_completion(messages)

        # Verify the call was made correctly
        mock_client.chat.completions.create.assert_called_once()
        call_args = mock_client.chat.completions.create.call_args[1]

        assert call_args["model"] == "gpt-4o"
        assert call_args["messages"] == messages
        assert call_args["temperature"] == 0.7
        assert call_args["max_tokens"] == 1000

        # Verify response format
        assert "choices" in result
        assert len(result["choices"]) == 1
        assert result["choices"][0]["message"]["content"] == "Test response"

    def test_openai_tool_formatting(self):
        """Test OpenAI tool formatting"""
        client = OpenAIClient("gpt-4o", "test-key")

        tools = [
            {
                "name": "add",
                "description": "Add two numbers",
                "inputSchema": {
                    "type": "object",
                    "properties": {
                        "a": {"type": "number"},
                        "b": {"type": "number"}
                    },
                    "required": ["a", "b"]
                }
            }
        ]

        formatted = client._format_tools_for_provider(tools)

        assert len(formatted) == 1
        assert formatted[0]["type"] == "function"
        assert formatted[0]["function"]["name"] == "add"
        assert formatted[0]["function"]["description"] == "Add two numbers"
        assert "parameters" in formatted[0]["function"]


class TestAIClientFactory:
    """Test AI client factory"""

    def test_create_openai_client(self):
        """Test creating OpenAI client via factory"""
        client = AIClientFactory.create_openai_client(
            model_name="gpt-4o",
            api_key="test-key"
        )

        assert isinstance(client, OpenAIClient)
        assert client.model_name == "gpt-4o"

    def test_create_client_by_provider(self):
        """Test creating client by provider name"""
        client = AIClientFactory.create_client(
            provider="openai",
            model_name="gpt-4o",
            api_key="test-key"
        )

        assert isinstance(client, OpenAIClient)
        assert client.model_name == "gpt-4o"

    def test_invalid_provider(self):
        """Test creating client with invalid provider"""
        with pytest.raises(ValueError, match="Unsupported AI provider"):
            AIClientFactory.create_client("invalid", "model", "key")

    @patch('mcp_template.llm_client.client_factory.CONFIG_AVAILABLE', True)
    @patch('mcp_template.llm_client.client_factory.Config')
    def test_missing_api_key(self, mock_config):
        """Test creating client without API key"""
        # Mock config to return None for API key
        mock_config.OPENAI_API_KEY = None
        
        with pytest.raises(ValueError, match="API key not provided and could not be loaded from config for provider: openai"):
            AIClientFactory.create_client("openai", "gpt-4o")

    def test_available_providers(self):
        """Test getting available providers"""
        providers = AIClientFactory.get_available_providers()
        assert "openai" in providers
        assert "claude" in providers
        assert "grok" in providers

    def test_validate_provider(self):
        """Test provider validation"""
        assert AIClientFactory.validate_provider("openai") is True
        assert AIClientFactory.validate_provider("claude") is True
        assert AIClientFactory.validate_provider("invalid") is False