'use strict';

module.exports = {
  up: async (queryInterface) => {
    const count = 1000000;
    const chunkSize = 10000;

    for (let i = 0; i < count; i += chunkSize) {
      const users = Array.from(
        { length: Math.min(chunkSize, count - i) },
        () => ({
          firstName:
            'Firstname_' +
            (Math.floor(Math.random() * 9_000_000_000) + 1_000_000_000),
          lastName:
            'Lastname_' +
            (Math.floor(Math.random() * 9_000_000_000) + 1_000_000_000),
          birthday: '2006-11-19 19:00:00.000 +00:00',
          sex: Math.floor(Math.random() * 2) + 1,
          problems: Math.random() < 0.5,
          createdAt: '2006-11-19 19:00:00.000 +00:00',
          updatedAt: '2006-11-19 19:00:00.000 +00:00',
        }),
      );

      await queryInterface.bulkInsert('user', users, {});
    }
  },

  down: async (queryInterface) => {
    await queryInterface.bulkDelete('user', null, {});
  },
};