"""
LangSwarm V2 Custom Provider Template

Template for creating custom provider implementations for V2 agents.
This serves as a reference and starting point for community contributions
and specialized provider implementations.

Usage:
    1. Copy this file and rename it to your provider name (e.g., 'myprovider.py')
    2. Replace 'Custom' with your provider name throughout the file
    3. Implement the abstract methods according to your provider's API
    4. Add your provider to the providers/__init__.py file
    5. Update the AgentBuilder to support your provider
"""

import asyncio
import json
import logging
from typing import Dict, List, Optional, Any, AsyncGenerator
from datetime import datetime

from ..interfaces import (
    IAgentProvider, IAgentSession, AgentMessage, IAgentResponse, 
    AgentUsage, IAgentConfiguration, ProviderType, AgentCapability
)
from ..base import BaseAgent

# Optional imports for your provider's SDK
try:
    # Replace with your provider's client library
    # from your_provider_sdk import YourProviderClient, YourProviderAsyncClient
    CUSTOM_PROVIDER_AVAILABLE = True
except ImportError:
    CUSTOM_PROVIDER_AVAILABLE = False


class CustomProvider(IAgentProvider):
    """
    Custom provider implementation template for V2 agents.
    
    Replace this class name and implementation with your specific provider.
    This template provides a complete structure for implementing a new provider.
    """
    
    def __init__(self, **kwargs):
        """
        Initialize Custom provider
        
        Args:
            **kwargs: Provider-specific initialization parameters
        """
        # Initialize your provider's client here
        self.client = None
        self._sessions: Dict[str, 'CustomSession'] = {}
        
        # Store provider-specific configuration
        self.provider_config = kwargs
        
        if not CUSTOM_PROVIDER_AVAILABLE:
            logging.warning("Custom provider SDK not available. Install with: pip install your-provider-sdk")
    
    def supported_models(self) -> List[str]:
        """
        Get list of supported models for your provider
        
        Returns:
            List of model names/identifiers supported by your provider
        """
        return [
            # Replace with your provider's actual model names
            "custom-model-small",
            "custom-model-medium", 
            "custom-model-large",
            "custom-model-instruct",
            "custom-model-code",
            "custom-model-chat"
        ]
    
    def supported_capabilities(self) -> List[AgentCapability]:
        """
        Get list of capabilities supported by your provider
        
        Returns:
            List of AgentCapability enums that your provider supports
        """
        return [
            # Replace with capabilities your provider actually supports
            AgentCapability.TEXT_GENERATION,
            AgentCapability.CONVERSATION,
            AgentCapability.STREAMING,
            AgentCapability.FUNCTION_CALLING,  # If your provider supports tools
            AgentCapability.CODE_GENERATION,   # If your provider supports code
            AgentCapability.JSON_MODE,         # If your provider supports structured output
            AgentCapability.EMBEDDINGS,        # If your provider supports embeddings
            # Add other capabilities as supported
        ]
    
    def validate_configuration(self, config: IAgentConfiguration) -> Dict[str, Any]:
        """
        Validate provider-specific configuration
        
        Args:
            config: Agent configuration to validate
            
        Returns:
            Dict with validation results including 'valid', 'issues', and 'warnings'
        """
        issues = []
        warnings = []
        
        # Check API key/authentication (if required)
        if not config.api_key:
            issues.append("Custom provider API key is required")
        
        # Check model availability
        if config.model not in self.supported_models():
            warnings.append(f"Model '{config.model}' not in known custom provider models")
        
        # Validate provider-specific parameters
        if config.temperature is not None and (config.temperature < 0 or config.temperature > 1):
            issues.append("Temperature must be between 0 and 1 for custom provider")
        
        if config.max_tokens is not None and config.max_tokens > 8192:
            warnings.append("Max tokens > 8192 may not be supported by all custom models")
        
        # Add your provider-specific validations here
        # Example:
        # if hasattr(config, 'custom_parameter') and config.custom_parameter not in valid_values:
        #     issues.append(f"Invalid custom_parameter: {config.custom_parameter}")
        
        return {
            "valid": len(issues) == 0,
            "issues": issues,
            "warnings": warnings
        }
    
    async def create_session(self, config: IAgentConfiguration) -> IAgentSession:
        """
        Create new agent session for your provider
        
        Args:
            config: Agent configuration
            
        Returns:
            IAgentSession instance for your provider
        """
        if not CUSTOM_PROVIDER_AVAILABLE:
            raise RuntimeError("Custom provider SDK not available")
        
        # Initialize your provider's client if needed
        if not self.client:
            # Replace with your provider's client initialization
            # self.client = YourProviderAsyncClient(api_key=config.api_key)
            pass
        
        session = CustomSession(self, config)
        self._sessions[session.session_id] = session
        return session
    
    async def send_message(self, session: IAgentSession, messages: List[AgentMessage], 
                          tools: Optional[List[Dict[str, Any]]] = None,
                          **kwargs) -> IAgentResponse:
        """
        Send message to your provider's API
        
        Args:
            session: Agent session
            messages: List of conversation messages
            tools: Optional list of available tools
            **kwargs: Additional parameters
            
        Returns:
            IAgentResponse with the provider's response
        """
        if not isinstance(session, CustomSession):
            raise ValueError("Session must be CustomSession for Custom provider")
        
        return await session.send_message(messages, tools, **kwargs)
    
    async def stream_message(self, session: IAgentSession, messages: List[AgentMessage],
                           tools: Optional[List[Dict[str, Any]]] = None,
                           **kwargs) -> AsyncGenerator[str, None]:
        """
        Stream message response from your provider's API
        
        Args:
            session: Agent session
            messages: List of conversation messages
            tools: Optional list of available tools
            **kwargs: Additional parameters
            
        Yields:
            str: Chunks of the streaming response
        """
        if not isinstance(session, CustomSession):
            raise ValueError("Session must be CustomSession for Custom provider")
        
        async for chunk in session.stream_message(messages, tools, **kwargs):
            yield chunk
    
    async def call_tool(self, session: IAgentSession, tool_name: str, 
                       parameters: Dict[str, Any]) -> Dict[str, Any]:
        """
        Execute tool call through your provider (if supported)
        
        Args:
            session: Agent session
            tool_name: Name of the tool to call
            parameters: Tool parameters
            
        Returns:
            Dict with tool execution results
        """
        # Implement tool calling if your provider supports it
        return {
            "tool_name": tool_name,
            "parameters": parameters,
            "result": "Tool execution implementation depends on provider capabilities",
            "provider": "custom"
        }
    
    def _convert_messages(self, messages: List[AgentMessage]) -> Any:
        """
        Convert internal messages to your provider's format
        
        Args:
            messages: List of internal AgentMessage objects
            
        Returns:
            Messages in your provider's expected format
        """
        # Convert to your provider's message format
        # Example for OpenAI-like format:
        converted_messages = []
        for msg in messages:
            converted_messages.append({
                "role": msg.role,
                "content": msg.content
                # Add any provider-specific fields
            })
        
        return converted_messages
    
    def _convert_tools(self, tools: Optional[List[Dict[str, Any]]]) -> Optional[Any]:
        """
        Convert tools to your provider's format (if supported)
        
        Args:
            tools: List of tool definitions
            
        Returns:
            Tools in your provider's expected format
        """
        if not tools:
            return None
        
        # Convert tools to your provider's format
        # This is highly provider-specific
        converted_tools = []
        for tool in tools:
            # Example conversion
            converted_tool = {
                "name": tool.get("name"),
                "description": tool.get("description"),
                "parameters": tool.get("parameters", {})
                # Add provider-specific tool format
            }
            converted_tools.append(converted_tool)
        
        return converted_tools
    
    def _estimate_cost(self, model: str, input_tokens: int, output_tokens: int) -> float:
        """
        Estimate cost for your provider's API usage
        
        Args:
            model: Model name
            input_tokens: Number of input tokens
            output_tokens: Number of output tokens
            
        Returns:
            Estimated cost in USD
        """
        # Replace with your provider's actual pricing
        pricing = {
            "custom-model-small": {"input": 0.0001, "output": 0.0002},
            "custom-model-medium": {"input": 0.0005, "output": 0.001},
            "custom-model-large": {"input": 0.001, "output": 0.002},
            # Add pricing for all your models
        }
        
        model_pricing = pricing.get(model, {"input": 0.001, "output": 0.002})
        
        input_cost = (input_tokens / 1000) * model_pricing["input"]
        output_cost = (output_tokens / 1000) * model_pricing["output"]
        
        return input_cost + output_cost
    
    async def get_health(self) -> Dict[str, Any]:
        """
        Get provider health status
        
        Returns:
            Dict with health status information
        """
        try:
            if not CUSTOM_PROVIDER_AVAILABLE:
                return {
                    "status": "unavailable",
                    "error": "Custom provider SDK not installed"
                }
            
            if not self.client:
                return {
                    "status": "not_initialized",
                    "message": "Client not initialized"
                }
            
            # Try a simple API call to check connectivity
            try:
                # Replace with an appropriate health check for your provider
                # response = await self.client.get_models()
                return {
                    "status": "healthy",
                    "provider": "custom",
                    "timestamp": datetime.utcnow().isoformat()
                }
            except Exception as e:
                return {
                    "status": "api_error",
                    "error": str(e),
                    "timestamp": datetime.utcnow().isoformat()
                }
                
        except Exception as e:
            return {
                "status": "error",
                "error": str(e),
                "timestamp": datetime.utcnow().isoformat()
            }


class CustomSession(IAgentSession):
    """Custom provider agent session implementation"""
    
    def __init__(self, provider: CustomProvider, config: IAgentConfiguration):
        """
        Initialize Custom session
        
        Args:
            provider: CustomProvider instance
            config: Agent configuration
        """
        self.provider = provider
        self.config = config
        self.session_id = f"custom_session_{datetime.utcnow().strftime('%Y%m%d_%H%M%S_%f')}"
        self.created_at = datetime.utcnow()
        self.last_activity = datetime.utcnow()
        self.message_count = 0
        self.total_tokens = 0
        self.total_cost = 0.0
        self.conversation_history: List[AgentMessage] = []
    
    async def send_message(self, messages: List[AgentMessage], 
                          tools: Optional[List[Dict[str, Any]]] = None,
                          **kwargs) -> IAgentResponse:
        """
        Send message to your provider's API
        
        Args:
            messages: List of conversation messages
            tools: Optional list of available tools
            **kwargs: Additional parameters
            
        Returns:
            IAgentResponse with the response
        """
        try:
            self.last_activity = datetime.utcnow()
            
            # Convert messages to your provider's format
            provider_messages = self.provider._convert_messages(messages)
            provider_tools = self.provider._convert_tools(tools)
            
            # Prepare request parameters for your provider
            request_params = {
                "model": self.config.model,
                "messages": provider_messages,
                "temperature": self.config.temperature or 0.7,
                "max_tokens": self.config.max_tokens or 1000,
                # Add other parameters your provider supports
            }
            
            # Add tools if provided and supported
            if provider_tools:
                request_params["tools"] = provider_tools
            
            # Add additional provider-specific parameters
            if self.config.top_p is not None:
                request_params["top_p"] = self.config.top_p
            
            # Make API call to your provider
            # Replace with actual API call to your provider
            # response = await self.provider.client.chat_completion(**request_params)
            
            # For template purposes, create a mock response
            mock_content = "This is a mock response from the custom provider template."
            mock_input_tokens = 50
            mock_output_tokens = 20
            mock_total_tokens = 70
            
            # Update session statistics
            self.message_count += 1
            self.total_tokens += mock_total_tokens
            cost = self.provider._estimate_cost(self.config.model, mock_input_tokens, mock_output_tokens)
            self.total_cost += cost
            
            # Create usage object
            usage = AgentUsage(
                input_tokens=mock_input_tokens,
                output_tokens=mock_output_tokens,
                total_tokens=mock_total_tokens,
                estimated_cost=cost
            )
            
            # Parse tool calls if present
            tool_calls = []
            # If your provider supports tool calling, extract tool calls here
            # tool_calls = self._parse_tool_calls(response)
            
            # Create response
            agent_response = IAgentResponse(
                content=mock_content,
                usage=usage,
                finish_reason="stop",  # or extract from your provider's response
                tool_calls=tool_calls,
                metadata={
                    "model": self.config.model,
                    "provider": "custom",
                    "session_id": self.session_id,
                    "message_count": self.message_count,
                    # Add any provider-specific metadata
                }
            )
            
            return agent_response
            
        except Exception as e:
            logging.error(f"Custom provider API error: {e}")
            # Return error response
            return IAgentResponse(
                content=f"Error: {str(e)}",
                usage=AgentUsage(0, 0, 0, 0.0),
                finish_reason="error",
                tool_calls=[],
                metadata={
                    "error": str(e),
                    "provider": "custom",
                    "session_id": self.session_id
                }
            )
    
    async def stream_message(self, messages: List[AgentMessage],
                           tools: Optional[List[Dict[str, Any]]] = None,
                           **kwargs) -> AsyncGenerator[str, None]:
        """
        Stream message response from your provider's API
        
        Args:
            messages: List of conversation messages
            tools: Optional list of available tools
            **kwargs: Additional parameters
            
        Yields:
            str: Chunks of the streaming response
        """
        try:
            self.last_activity = datetime.utcnow()
            
            # Convert messages and prepare request
            provider_messages = self.provider._convert_messages(messages)
            provider_tools = self.provider._convert_tools(tools)
            
            # Prepare streaming request parameters
            request_params = {
                "model": self.config.model,
                "messages": provider_messages,
                "temperature": self.config.temperature or 0.7,
                "max_tokens": self.config.max_tokens or 1000,
                "stream": True,  # Enable streaming
                # Add other parameters
            }
            
            if provider_tools:
                request_params["tools"] = provider_tools
            
            # Stream the response from your provider
            # Replace with actual streaming API call
            # async for chunk in self.provider.client.stream_chat_completion(**request_params):
            #     content = self._extract_chunk_content(chunk)
            #     if content:
            #         yield content
            
            # For template purposes, yield mock streaming chunks
            mock_response = "This is a mock streaming response from the custom provider template."
            words = mock_response.split()
            for word in words:
                yield word + " "
                await asyncio.sleep(0.05)  # Simulate streaming delay
            
            # Update session statistics
            self.message_count += 1
            
        except Exception as e:
            logging.error(f"Custom provider streaming error: {e}")
            yield f"Error: {str(e)}"
    
    def _extract_chunk_content(self, chunk: Any) -> Optional[str]:
        """
        Extract content from streaming chunk based on your provider's format
        
        Args:
            chunk: Streaming chunk from your provider
            
        Returns:
            Content string or None
        """
        # Extract content from your provider's streaming format
        # This is highly provider-specific
        # Example for OpenAI-like format:
        # if hasattr(chunk, 'choices') and chunk.choices:
        #     delta = chunk.choices[0].delta
        #     if hasattr(delta, 'content') and delta.content:
        #         return delta.content
        
        return None
    
    def _parse_tool_calls(self, response: Any) -> List[Dict[str, Any]]:
        """
        Parse tool calls from your provider's response
        
        Args:
            response: Response from your provider
            
        Returns:
            List of tool call dictionaries
        """
        tool_calls = []
        
        # Parse tool calls from your provider's response format
        # This is highly provider-specific
        # Example:
        # if hasattr(response, 'tool_calls') and response.tool_calls:
        #     for tool_call in response.tool_calls:
        #         tool_calls.append({
        #             "id": tool_call.id,
        #             "name": tool_call.function.name,
        #             "arguments": json.loads(tool_call.function.arguments)
        #         })
        
        return tool_calls
    
    def get_session_info(self) -> Dict[str, Any]:
        """Get session information"""
        return {
            "session_id": self.session_id,
            "provider": "custom",
            "model": self.config.model,
            "created_at": self.created_at.isoformat(),
            "last_activity": self.last_activity.isoformat(),
            "message_count": self.message_count,
            "total_tokens": self.total_tokens,
            "total_cost": self.total_cost,
            "conversation_length": len(self.conversation_history)
        }


class CustomAgent(BaseAgent):
    """Custom provider-specific agent implementation"""
    
    def __init__(self, config: IAgentConfiguration, **provider_kwargs):
        """
        Initialize Custom agent
        
        Args:
            config: Agent configuration
            **provider_kwargs: Provider-specific initialization parameters
        """
        provider = CustomProvider(**provider_kwargs)
        super().__init__(config, provider)


# Example usage and documentation
"""
Example Usage:

# 1. Basic usage
from langswarm.core.agents.providers.custom_template import CustomAgent
from langswarm.core.agents import IAgentConfiguration, ProviderType

config = IAgentConfiguration(
    name="my-custom-agent",
    provider=ProviderType.CUSTOM,  # You'll need to add this to the enum
    model="custom-model-large",
    api_key="your-api-key"
)

agent = CustomAgent(config)

# 2. Using with AgentBuilder (after adding to builder)
from langswarm.core.agents import AgentBuilder

agent = (AgentBuilder("my-agent")
         .custom(api_key="your-key")
         .model("custom-model-large")
         .temperature(0.7)
         .build())

# 3. Advanced usage with provider-specific parameters
agent = CustomAgent(
    config,
    custom_parameter="value",
    another_parameter=42
)

Implementation Checklist:
□ Replace all 'Custom' references with your provider name
□ Implement actual API calls in send_message and stream_message
□ Add your provider's SDK imports and error handling
□ Update supported_models() with actual model names
□ Update supported_capabilities() with actual capabilities
□ Implement provider-specific message and tool conversion
□ Add accurate pricing information in _estimate_cost()
□ Implement proper health checking in get_health()
□ Add provider-specific configuration validation
□ Update metadata and session information
□ Add comprehensive error handling and logging
□ Write unit tests for your provider
□ Add documentation and examples
□ Register your provider in the main providers module
□ Add your provider to the AgentBuilder class
"""
