"""Todoist API integration."""

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

try:
    from todoist_api_python.api import TodoistAPI
    HAS_TODOIST = True
except ImportError:
    HAS_TODOIST = False

from .base import TaskProvider


class TodoistProvider(TaskProvider):
    """Todoist API integration for task management."""

    def __init__(
        self,
        api_token: Optional[str] = None,
        credentials_path: Optional[str] = None,
    ):
        """Initialize the Todoist provider.
        
        Args:
            api_token: Todoist API token
            credentials_path: Path to a JSON file containing credentials
        """
        if not HAS_TODOIST:
            raise ImportError(
                "The 'todoist-api-python' package is required for Todoist integration. "
                "Install it with 'pip install todoist-api-python'."
            )
            
        # Read credentials from environment variables if not provided
        self.api_token = api_token or os.environ.get("TODOIST_API_TOKEN")
        
        if credentials_path:
            # TODO: Implement loading credentials from file
            pass
            
        if not self.api_token:
            raise ValueError(
                "Missing Todoist API token. "
                "Provide api_token or set TODOIST_API_TOKEN environment variable."
            )
            
        # Initialize the Todoist client
        self.api = TodoistAPI(self.api_token)
        
    def create_task(
        self, 
        title: str, 
        **kwargs
    ) -> Dict[str, Any]:
        """Create a Todoist task.
        
        Args:
            title: Task title
            **kwargs: Additional parameters (description, due_date, project_id, etc.)
            
        Returns:
            Dict containing the created task details
        """
        # TODO: Implement task creation using Todoist API
        # The Todoist Python SDK requires handling project IDs, labels, etc.
        raise NotImplementedError("Method not yet implemented")
    
    def list_tasks(
        self, 
        max_results: int = 10, 
        **kwargs
    ) -> List[Dict[str, Any]]:
        """List Todoist tasks with optional filtering.
        
        Args:
            max_results: Maximum number of tasks to return
            **kwargs: Additional parameters for filtering (project_id, etc.)
            
        Returns:
            List of tasks matching the criteria
        """
        # TODO: Implement task listing using Todoist API
        # Convert SDK objects to dicts for consistent output
        raise NotImplementedError("Method not yet implemented")
    
    def get_task(self, task_id: str, **kwargs) -> Dict[str, Any]:
        """Get a specific Todoist task by ID.
        
        Args:
            task_id: ID of the task to retrieve
            **kwargs: Additional parameters
            
        Returns:
            Dict containing the task details
        """
        # TODO: Implement task retrieval using Todoist API
        raise NotImplementedError("Method not yet implemented")
    
    def update_task(
        self, 
        task_id: str, 
        **kwargs
    ) -> Dict[str, Any]:
        """Update an existing Todoist task.
        
        Args:
            task_id: ID of the task to update
            **kwargs: Fields to update (title, description, due_date, etc.)
            
        Returns:
            Dict containing the updated task details
        """
        # TODO: Implement task update using Todoist API
        raise NotImplementedError("Method not yet implemented")
    
    def delete_task(self, task_id: str, **kwargs) -> bool:
        """Delete a Todoist task.
        
        Args:
            task_id: ID of the task to delete
            **kwargs: Additional parameters
            
        Returns:
            True if deletion was successful, False otherwise
        """
        # TODO: Implement task deletion using Todoist API
        raise NotImplementedError("Method not yet implemented")
    
    def complete_task(self, task_id: str, **kwargs) -> Dict[str, Any]:
        """Mark a Todoist task as complete.
        
        Args:
            task_id: ID of the task to mark as complete
            **kwargs: Additional parameters
            
        Returns:
            Dict containing the task details
        """
        # TODO: Implement task completion using Todoist API
        raise NotImplementedError("Method not yet implemented")
        
    def list_projects(self, **kwargs) -> List[Dict[str, Any]]:
        """List Todoist projects.
        
        Args:
            **kwargs: Filtering parameters
            
        Returns:
            List of projects available to the user
        """
        # TODO: Implement project listing using Todoist API
        raise NotImplementedError("Method not yet implemented") 