'use strict';

/**
 * 迁移文件：创建管理员表（admins）
 * 存储后台管理员账号信息
 */

module.exports = {
  /**
   * 执行迁移：创建 admins 表
   * @param {import('sequelize').QueryInterface} queryInterface
   * @param {import('sequelize').Sequelize} Sequelize
   */
  up: async (queryInterface, Sequelize) => {
    const { INTEGER, STRING, DATE } = Sequelize;

    await queryInterface.createTable('admins', {
      id: {
        type: INTEGER,
        primaryKey: true,
        autoIncrement: true,
        allowNull: false,
        comment: '管理员唯一标识',
      },
      username: {
        type: STRING(50),
        allowNull: false,
        unique: true,
        comment: '管理员用户名',
      },
      password: {
        type: STRING(100),
        allowNull: false,
        comment: '管理员密码',
      },
      created_at: {
        type: DATE,
        allowNull: false,
        comment: '创建时间',
      },
      updated_at: {
        type: DATE,
        allowNull: false,
        comment: '更新时间',
      },
    });

    await queryInterface.addIndex('admins', ['username'], {
      unique: true,
      name: 'idx_admins_username',
    });
  },

  /**
   * 回滚迁移：删除 admins 表
   * @param {import('sequelize').QueryInterface} queryInterface
   */
  down: async (queryInterface) => {
    await queryInterface.dropTable('admins');
  },
};