src/validators/user.validator.ts

import { checkSchema } from 'express-validator';
import User from '../models/users';
import Role from '../models/roles';
import { Op } from 'sequelize';

const validateUser = checkSchema({
  name: {
    notEmpty: {
      errorMessage: 'Name is required',
    },
  },
  email: {
    notEmpty: {
      errorMessage: 'Email is required',
    },
    isEmail: {
      errorMessage: 'Invalid email address',
    },
    custom: {
      options: async (value) => {
        const ifUserExists = await User.findOne({ where: { email: value } });
        if (ifUserExists) {
          return Promise.reject('User already exists'); 
        }
      },
    },
  },
  password: { 
    notEmpty: {
      errorMessage: 'Password is required',
    },
    isLength: {
      options: { min: 8 }, 
      errorMessage: 'Password must be at least 8 characters long',
    },
  },
  status: {
    notEmpty: {
      errorMessage: 'Status is required',
    },
  },
  role_id: {
    notEmpty: {
      errorMessage: 'Role ID is required',
    },
    custom: {
      options: async (value) => {
        const role = await Role.findByPk(value);
        if (!role) {
          return Promise.reject('Role ID is invalid'); 
        }
      },
    },
  },
});

const validateUserUpdate = checkSchema({
  email: {
    optional: true,
    isEmail: {
      errorMessage: 'Invalid email address',
    },
    custom: {
      options: async (value, { req }: { req: any}) => {
        const id = req.params.id;
        const ifUserExists = await User.findOne({ 
          where: { 
            email: value, 
            id: { [Op.ne]: id } 
          } 
        });
        if (ifUserExists) {
          return Promise.reject('User already exists');
        }
      },
    },
  },
  role_id: {
    optional: true,
    custom: {
      options: async (value) => {
        const role = await Role.findByPk(value);
        if (!role) {
          return Promise.reject('Role ID is invalid'); 
        }
      },
    },
  },
  password: { 
    optional: true,
    isLength: {
      options: { min: 8 }, 
      errorMessage: 'Password must be at least 8 characters long',
    },
  },
});

export { validateUser, validateUserUpdate };