import { Injectable } from "@nestjs/common";
import { Model } from 'mongoose';
import { User, UserDocument } from '../schemas/user.schema';
import { InjectModel } from '@nestjs/mongoose';
import { ValidationArguments, ValidatorConstraint, ValidatorConstraintInterface } from "class-validator";


@ValidatorConstraint({ name: 'UserExists', async: true })
@Injectable()
export class UserExistsRule implements ValidatorConstraintInterface {
  constructor(    
      @InjectModel(User.name) private readonly userModel: Model<UserDocument>,
  ) {}

  async validate(value: string) {
    try {
      await this.userModel.find({email: value});
    } catch (e) {
      return false;
    }

    return true;
  }

  defaultMessage(args: ValidationArguments) {
    return `User doesn't exist`;
  }
}