from typing import List

from flask import g

from services.permissions.exceptions import (
    UserNotFound,
    UserHasNoAccessToLabel,
    LabelNotFound,
    UsersValidationError
)
from services.users_repository import UsersRepository
from utils.exceptions import Forbidden
from utils.list_utils import diff


class UsersValidator:
    users_repository = UsersRepository()

    def validate_request_user_admin(self):
        if not g.is_admin:
            raise Forbidden()

    def validate_user_exist(self, user_id: int):
        if not self.users_repository.is_user_exists(user_id):
            raise UserNotFound()

    def validate_users_exists_and_from_label(self, label_id: int, users_ids: List[int]):
        users = self.users_repository.get_users_with_label(label_id, users_ids)
        unmatched_users = diff(users_ids, [user.id for user in users])
        if unmatched_users:
            raise UsersValidationError(f"Users with id {unmatched_users} not found or not have label {label_id}")

    def validate_user_has_label(self, user_id: int, label_id: int):
        if not self.users_repository.is_user_has_label(user_id, label_id):
            raise UserHasNoAccessToLabel()

    def validate_label_exist(self, label_id: int):
        if not self.users_repository.is_label_exists(label_id):
            raise LabelNotFound()