"""Slack API integration."""

import os
from typing import Any, Dict, List, Optional, Union

try:
    from slack_sdk import WebClient
    from slack_sdk.errors import SlackApiError
    HAS_SLACK = True
except ImportError:
    HAS_SLACK = False

from .base import CommunicationProvider


class SlackProvider(CommunicationProvider):
    """Slack API integration for messaging."""

    def __init__(
        self,
        bot_token: Optional[str] = None,
        credentials_path: Optional[str] = None,
    ):
        """Initialize the Slack provider.
        
        Args:
            bot_token: Slack Bot User OAuth Token
            credentials_path: Path to a JSON file containing credentials
        """
        if not HAS_SLACK:
            raise ImportError(
                "The 'slack-sdk' package is required for Slack integration. "
                "Install it with 'pip install slack-sdk'."
            )
            
        # Read credentials from environment variables if not provided
        self.bot_token = bot_token or os.environ.get("SLACK_BOT_TOKEN")
        
        if credentials_path:
            # TODO: Implement loading credentials from file
            pass
            
        if not self.bot_token:
            raise ValueError(
                "Missing Slack bot token. "
                "Provide bot_token or set SLACK_BOT_TOKEN environment variable."
            )
            
        # Initialize the Slack client
        self.client = WebClient(token=self.bot_token)
        
    def send_message(
        self, 
        content: str, 
        recipient: str,
        **kwargs
    ) -> Dict[str, Any]:
        """Send a message to a Slack channel or user.
        
        Args:
            content: Message text
            recipient: Channel ID or user ID to send the message to
            **kwargs: Additional parameters (blocks, attachments, etc.)
            
        Returns:
            Dict containing the sent message details
        """
        try:
            # TODO: Implement message sending using Slack API
            # Handle different message types (text, blocks, attachments)
            raise NotImplementedError("Method not yet implemented")
        except SlackApiError as e:
            # Handle Slack API errors
            raise ValueError(f"Error sending message to Slack: {str(e)}")
    
    def list_channels(
        self, 
        **kwargs
    ) -> List[Dict[str, Any]]:
        """List available Slack channels.
        
        Args:
            **kwargs: Filtering parameters
            
        Returns:
            List of channels
        """
        try:
            # TODO: Implement channel listing using Slack API
            # Convert Slack API response to consistent dict format
            raise NotImplementedError("Method not yet implemented")
        except SlackApiError as e:
            # Handle Slack API errors
            raise ValueError(f"Error listing Slack channels: {str(e)}")
            
    def upload_file(
        self,
        file_path: str,
        channel: str,
        title: Optional[str] = None,
        **kwargs
    ) -> Dict[str, Any]:
        """Upload a file to a Slack channel.
        
        Args:
            file_path: Path to the file to upload
            channel: Channel ID to upload the file to
            title: Optional title for the file
            **kwargs: Additional parameters
            
        Returns:
            Dict containing the upload details
        """
        try:
            # TODO: Implement file upload using Slack API
            raise NotImplementedError("Method not yet implemented")
        except SlackApiError as e:
            # Handle Slack API errors
            raise ValueError(f"Error uploading file to Slack: {str(e)}")
            
    def get_channel_history(
        self,
        channel: str,
        limit: int = 100,
        **kwargs
    ) -> List[Dict[str, Any]]:
        """Get message history from a Slack channel.
        
        Args:
            channel: Channel ID to get history from
            limit: Maximum number of messages to retrieve
            **kwargs: Additional parameters (oldest, latest, etc.)
            
        Returns:
            List of messages
        """
        try:
            # TODO: Implement channel history retrieval using Slack API
            raise NotImplementedError("Method not yet implemented")
        except SlackApiError as e:
            # Handle Slack API errors
            raise ValueError(f"Error getting channel history from Slack: {str(e)}") 