from quart import Blueprint, request, jsonify
from app.auth.quart_jwt import create_access_token, jwt_required, get_jwt_identity
from app.models.user import User
from app.services.msal_service import MSALService

auth_bp = Blueprint('auth', __name__)

@auth_bp.route('/register', methods=['POST'])
async def register():
    data = await request.get_json()
    
    if not data or not data.get('username') or not data.get('email') or not data.get('password'):
        return jsonify({"message": "Missing required fields"}), 400
    
    username = data.get('username')
    email = data.get('email')
    password = data.get('password')
    
    # Check if user already exists
    if await User.find_by_username(username):
        return jsonify({"message": "Username already taken"}), 409
    if await User.find_by_email(email):
        return jsonify({"message": "Email already registered"}), 409
    
    # Create new user
    hashed_password = User.hash_password(password)
    new_user = User(username=username, email=email, password_hash=hashed_password)
    user_id = await new_user.save()
    
    # Generate access token
    access_token = create_access_token(identity=str(user_id))
    
    return jsonify({
        "message": "User registered successfully",
        "access_token": access_token,
        "user": new_user.to_dict()
    }), 201

@auth_bp.route('/login', methods=['POST'])
async def login():
    try:
        data = await request.get_json()
        
        if not data or not data.get('username') or not data.get('password'):
            return jsonify({"message": "Missing username or password"}), 400
        
        username = data.get('username')
        password = data.get('password')
        
        # Default credentials for development/testing
        if username == "user" and password == "pass":
            # Create a mock user with a valid ObjectId
            from bson import ObjectId
            default_id = str(ObjectId())
            
            user_mock = {
                "_id": default_id,
                "username": "user",
                "email": "user@example.com",
                "role": "admin"
            }
            
            # Generate access token
            access_token = create_access_token(identity=default_id)
            
            return jsonify({
                "message": "Login successful (default user)",
                "access_token": access_token,
                "user": {
                    "username": user_mock['username'],
                    "email": user_mock['email'],
                    "role": user_mock['role']
                }
            }), 200
        
        # Try to find user in database
        try:
            # Find user by username
            user_data = await User.find_by_username(username)
            if not user_data:
                return jsonify({"message": "Invalid username or password"}), 401
            
            # Check password
            if not User.check_password(user_data['password_hash'], password):
                return jsonify({"message": "Invalid username or password"}), 401
            
            # Generate access token
            access_token = create_access_token(identity=str(user_data['_id']))
            
            return jsonify({
                "message": "Login successful",
                "access_token": access_token,
                "user": {
                    "username": user_data['username'],
                    "email": user_data['email'],
                    "role": user_data.get('role', 'user')
                }
            }), 200
        except Exception as e:
            print(f"Database error during login: {e}")
            # If we can't access the database but it's the default user, still allow login
            if username == "user" and password == "pass":
                # This was handled above
                pass
            else:
                return jsonify({"message": "Database error, please try again later"}), 500
            
    except Exception as e:
        print(f"Unexpected error in login route: {e}")
        return jsonify({"message": "Internal server error"}), 500

@auth_bp.route('/me', methods=['GET'])
@jwt_required()
async def get_profile():
    user_id = get_jwt_identity()
    
    # Handle the default_id case specially
    if user_id == "default_id":
        # Return mock user data for default_id
        return jsonify({
            "username": "user",
            "email": "user@example.com",
            "role": "admin"
        }), 200
    
    try:
        user_data = await User.find_by_id(user_id)
        
        if not user_data:
            return jsonify({"message": "User not found"}), 404
        
        return jsonify({
            "username": user_data['username'],
            "email": user_data['email'],
            "role": user_data.get('role', 'user')
        }), 200
    except Exception as e:
        print(f"Error in get_profile: {e}")
        # If there's an error, still return default user data
        return jsonify({
            "username": "user",
            "email": "user@example.com",
            "role": "user"
        }), 200

@auth_bp.route('/microsoft', methods=['POST'])
async def microsoft_login():
    """Handle Microsoft OAuth authentication."""
    try:
        data = await request.get_json()
        
        if not data or not data.get('id_token'):
            return jsonify({"message": "Missing Microsoft ID token"}), 400
        
        id_token = data.get('id_token')
        
        # Initialize MSAL service and validate the token
        msal_service = MSALService()
        microsoft_user_info = msal_service.validate_token(id_token)
        
        if not microsoft_user_info:
            return jsonify({"message": "Invalid Microsoft ID token"}), 401
        
        microsoft_id = microsoft_user_info.get('microsoft_id')
        email = microsoft_user_info.get('email')
        
        if not microsoft_id or not email:
            return jsonify({"message": "Unable to retrieve user information from Microsoft"}), 400
        
        # Try to find existing user by Microsoft ID or email
        existing_user = None
        try:
            # First try to find by Microsoft ID
            existing_user = await User.find_by_microsoft_id(microsoft_id)
            
            # If not found by Microsoft ID, try by email
            if not existing_user:
                existing_user = await User.find_by_email(email)
                
                # If found by email but no Microsoft ID, update the user to link Microsoft account
                if existing_user and not existing_user.get('microsoft_id'):
                    await User.update_microsoft_id(existing_user['_id'], microsoft_id)
                    existing_user['microsoft_id'] = microsoft_id
                    existing_user['auth_type'] = 'microsoft'
                    
        except Exception as e:
            print(f"Database error during Microsoft user lookup: {e}")
            # Continue to create new user if lookup fails
        
        # Create new user if not found
        if not existing_user:
            try:
                user_data = msal_service.create_user_data(microsoft_user_info)
                new_user = User(**user_data)
                user_id = await new_user.save()
                
                existing_user = {
                    "_id": user_id,
                    "username": user_data['username'],
                    "email": user_data['email'],
                    "role": user_data['role'],
                    "auth_type": user_data['auth_type'],
                    "microsoft_id": user_data['microsoft_id']
                }
                
                print(f"Created new Microsoft user: {email}")
                
            except Exception as e:
                print(f"Error creating Microsoft user: {e}")
                return jsonify({"message": "Failed to create user account"}), 500
        
        # Generate our backend JWT access token
        access_token = create_access_token(identity=str(existing_user['_id']))
        
        # Return response in same format as local login
        return jsonify({
            "message": "Microsoft login successful",
            "access_token": access_token,
            "user": {
                "username": existing_user['username'],
                "email": existing_user['email'],
                "role": existing_user.get('role', 'user'),
                "authType": "microsoft"
            }
        }), 200
        
    except Exception as e:
        print(f"Unexpected error in Microsoft login route: {e}")
        return jsonify({"message": "Internal server error"}), 500


@auth_bp.route('/refresh-token', methods=['POST'])
async def refresh_token():
    """Generate a new token for testing during JWT system migration."""
    try:
        data = (await request.get_json()) or {}
        user_id = data.get('user_id', 'default_user')
        
        # Create a new token with our Quart-JWT system
        access_token = create_access_token(user_id)
        
        return jsonify({
            "message": "Token refreshed successfully",
            "access_token": access_token,
            "user_id": user_id,
            "system": "quart-jwt"
        }), 200
        
    except Exception as e:
        return jsonify({"message": f"Token refresh failed: {str(e)}"}), 500