"""
Telegram Mini App authentication middleware
"""
from typing import Optional
from fastapi import Request, HTTPException, status
from database import users_collection
from utils.telegram_initdata import validate_init_data, normalize_telegram_user
from config import settings


async def authenticate_telegram_moderation(request: Request) -> Optional[dict]:
    """
    Authenticate user via Telegram Mini App initData
    
    Returns:
        User dict if authenticated, None otherwise
    
    Raises:
        HTTPException: If authentication fails
    """
    # Get initData from headers
    auth_header = request.headers.get('authorization', '')
    init_data_raw = None
    
    if auth_header.startswith('tma '):
        init_data_raw = auth_header[4:].strip()
    
    if not init_data_raw:
        init_data_raw = request.headers.get('x-telegram-init-data')
        if init_data_raw:
            init_data_raw = init_data_raw.strip()
    
    if not init_data_raw:
        print('[TelegramAuth] No initData found in headers')
        return None
    
    try:
        # Validate initData
        payload = validate_init_data(init_data_raw, settings.MODERATION_BOT_TOKEN)
        
        telegram_user = payload.get('user')
        if not telegram_user:
            print('[TelegramAuth] No user data in initData')
            raise HTTPException(
                status_code=status.HTTP_401_UNAUTHORIZED,
                detail='Отсутствуют данные пользователя в initData'
            )
        
        # Normalize user data
        normalized_user = normalize_telegram_user(telegram_user)
        telegram_id = normalized_user.get('id')
        
        if not telegram_id:
            raise HTTPException(
                status_code=status.HTTP_401_UNAUTHORIZED,
                detail='Неверный ID пользователя'
            )
        
        print(f'[TelegramAuth] Validated initData for telegramId={telegram_id}')
        
        # Find or create user
        from bson import ObjectId
        user = await users_collection().find_one({'telegramId': telegram_id})
        
        if not user:
            # Create new user
            from datetime import datetime
            user_doc = {
                'telegramId': telegram_id,
                'username': normalized_user.get('username') or normalized_user.get('firstName') or 'user',
                'firstName': normalized_user.get('firstName'),
                'lastName': normalized_user.get('lastName'),
                'photoUrl': normalized_user.get('photoUrl'),
                'role': 'user',
                'createdAt': datetime.utcnow()
            }
            result = await users_collection().insert_one(user_doc)
            user = await users_collection().find_one({'_id': result.inserted_id})
            print(f'[TelegramAuth] Created new user: {telegram_id}')
        else:
            # Update user data if needed
            update_fields = {}
            if normalized_user.get('username') and not user.get('username'):
                update_fields['username'] = normalized_user.get('username')
            if normalized_user.get('firstName') and not user.get('firstName'):
                update_fields['firstName'] = normalized_user.get('firstName')
            if normalized_user.get('lastName') is not None:
                update_fields['lastName'] = normalized_user.get('lastName')
            if normalized_user.get('photoUrl') and not user.get('photoUrl'):
                update_fields['photoUrl'] = normalized_user.get('photoUrl')
            
            if update_fields:
                from datetime import datetime
                update_fields['lastActiveAt'] = datetime.utcnow()
                await users_collection().update_one(
                    {'_id': user['_id']},
                    {'$set': update_fields}
                )
                user.update(update_fields)
        
        if user.get('banned'):
            raise HTTPException(
                status_code=status.HTTP_403_FORBIDDEN,
                detail='Пользователь заблокирован'
            )
        
        return user
        
    except HTTPException:
        raise
    except ValueError as e:
        print(f'[TelegramAuth] Validation error: {e}')
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail=f'{str(e)}. Используйте официальный клиент.'
        )
    except Exception as e:
        print(f'[TelegramAuth] Error: {type(e).__name__}: {e}')
        import traceback
        traceback.print_exc()
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail='Ошибка авторизации. Используйте официальный клиент.'
        )