"""
User Context and Authentication Module
Handles Stytch authentication and user permission checks
"""

from typing import Optional, Dict, Any
import os
from stytch import Client

# Initialize Stytch client
stytch_client = None
if os.getenv('STYTCH_PROJECT_ID') and os.getenv('STYTCH_SECRET'):
    try:
        stytch_client = Client(
            project_id=os.getenv('STYTCH_PROJECT_ID'),
            secret=os.getenv('STYTCH_SECRET')
        )
        print(f"Stytch client initialized with project: {os.getenv('STYTCH_PROJECT_ID')[:20]}...")
    except Exception as e:
        print(f"Warning: Stytch client initialization failed: {e}")


def verify_token(token: str) -> Optional[Dict[str, Any]]:
    """
    Verify authentication token and return user info

    Args:
        token: Bearer token from Authorization header

    Returns:
        User info dict with user_id, email, scopes
        None if token is invalid
    """
    # Development mode: Skip authentication
    if os.getenv('ENVIRONMENT') == 'development' and os.getenv('SKIP_AUTH') == 'true':
        return {
            'user_id': 'dev-user',
            'email': 'dev@fleetmind.local',
            'scopes': ['admin'],
            'name': 'Development User'
        }

    if not stytch_client:
        print("Error: Stytch client not initialized")
        return None

    if not token:
        return None

    try:
        # Verify session token with Stytch
        result = stytch_client.sessions.authenticate(session_token=token)

        # Extract user information
        user_info = {
            'user_id': result.user.user_id,
            'email': result.user.emails[0].email if result.user.emails else 'unknown',
            'scopes': result.session.custom_claims.get('scopes', ['orders:read', 'drivers:read']),
            'name': result.user.name if hasattr(result.user, 'name') else 'Unknown User'
        }

        return user_info

    except Exception as e:
        print(f"Token validation failed: {e}")
        return None


def check_permission(user_scopes: list, required_scope: str) -> bool:
    """
    Check if user has required permission

    Args:
        user_scopes: List of scopes user has
        required_scope: Scope needed for this operation

    Returns:
        True if user has permission
    """
    # Admin has all permissions
    if 'admin' in user_scopes:
        return True

    # Check specific scope
    return required_scope in user_scopes


# Scope requirements for each tool
SCOPE_REQUIREMENTS = {
    # Order operations
    'create_order': 'orders:write',
    'fetch_orders': 'orders:read',
    'update_order': 'orders:write',
    'delete_order': 'orders:write',
    'search_orders': 'orders:read',
    'get_order_details': 'orders:read',
    'count_orders': 'orders:read',
    'get_incomplete_orders': 'orders:read',

    # Driver operations
    'create_driver': 'drivers:write',
    'fetch_drivers': 'drivers:read',
    'update_driver': 'drivers:write',
    'delete_driver': 'drivers:write',
    'search_drivers': 'drivers:read',
    'get_driver_details': 'drivers:read',
    'count_drivers': 'drivers:read',
    'get_available_drivers': 'drivers:read',

    # Assignment operations
    'create_assignment': 'assignments:manage',
    'auto_assign_order': 'assignments:manage',
    'intelligent_assign_order': 'assignments:manage',
    'get_assignment_details': 'assignments:manage',
    'update_assignment': 'assignments:manage',
    'unassign_order': 'assignments:manage',
    'complete_delivery': 'assignments:manage',
    'fail_delivery': 'assignments:manage',

    # Routing (public - no scope required)
    'geocode_address': None,
    'calculate_route': None,
    'calculate_intelligent_route': None,

    # Dangerous operations (admin only)
    'delete_all_orders': 'admin',
    'delete_all_drivers': 'admin',
}


def get_required_scope(tool_name: str) -> Optional[str]:
    """
    Get the scope required for a tool

    Args:
        tool_name: Name of the tool

    Returns:
        Required scope or None if tool is public
    """
    return SCOPE_REQUIREMENTS.get(tool_name, 'admin')