from flask_login import current_user
from models import RoomMemberPermission
from datetime import datetime, timezone

def user_has_permission(room, perm_name):
    """
    Check if the current user has a specific permission in a room.
    
    Args:
        room: Room object
        perm_name: Name of the permission to check (e.g., 'can_view', 'can_upload')
    
    Returns:
        bool: True if user has permission, False otherwise
    """
    # Admin users have all permissions
    if current_user.is_admin:
        return True
    
    # Check if user is a member of the room
    if current_user not in room.members:
        return False
    
    # Get user's permissions for this room
    permission = RoomMemberPermission.query.filter_by(
        room_id=room.id,
        user_id=current_user.id
    ).first()
    
    # If no specific permissions are set, user only has view access
    if not permission:
        return perm_name == 'can_view'
    
    # Check the specific permission
    return getattr(permission, perm_name, False)