const { DataTypes } = require('sequelize');
const sequelize = require('../config/db');

const Coupon = sequelize.define('Coupon', {
  id: {
    type: DataTypes.INTEGER,
    primaryKey: true,
    autoIncrement: true,
    comment: '优惠券ID'
  },
  code: {
    type: DataTypes.STRING(50),
    allowNull: false,
    unique: true,
    comment: '优惠券代码'
  },
  name: {
    type: DataTypes.STRING(100),
    allowNull: false,
    comment: '优惠券名称'
  },
  description: {
    type: DataTypes.TEXT,
    allowNull: true,
    comment: '描述'
  },
  discountType: {
    type: DataTypes.ENUM('percentage', 'fixed'),
    defaultValue: 'percentage',
    comment: '折扣类型：percentage-百分比，fixed-固定金额'
  },
  discountValue: {
    type: DataTypes.DECIMAL(10, 2),
    allowNull: false,
    comment: '折扣值'
  },
  minOrderAmount: {
    type: DataTypes.DECIMAL(10, 2),
    defaultValue: 0,
    comment: '最低订单金额'
  },
  maxDiscountAmount: {
    type: DataTypes.DECIMAL(10, 2),
    allowNull: true,
    comment: '最大折扣金额'
  },
  applicablePlans: {
    type: DataTypes.JSON,
    allowNull: true,
    comment: '适用套餐ID列表'
  },
  usageLimit: {
    type: DataTypes.INTEGER,
    defaultValue: 0,
    comment: '使用次数限制'
  },
  usageCount: {
    type: DataTypes.INTEGER,
    defaultValue: 0,
    comment: '已使用次数'
  },
  validStart: {
    type: DataTypes.DATE,
    allowNull: false,
    comment: '有效期开始'
  },
  validEnd: {
    type: DataTypes.DATE,
    allowNull: false,
    comment: '有效期结束'
  },
  status: {
    type: DataTypes.ENUM('active', 'inactive', 'expired'),
    defaultValue: 'active',
    comment: '状态'
  },
  isDeleted: {
    type: DataTypes.TINYINT(1),
    defaultValue: 0,
    comment: '删除状态'
  },
  createTime: {
    type: DataTypes.DATE,
    allowNull: false,
    defaultValue: DataTypes.NOW,
    comment: '创建时间'
  },
  updateTime: {
    type: DataTypes.DATE,
    allowNull: false,
    defaultValue: DataTypes.NOW,
    comment: '更新时间'
  }
}, {
  tableName: 'coupons',
  timestamps: false,
  indexes: [
    { fields: ['code'] },
    { fields: ['status'] },
    { fields: ['validStart', 'validEnd'] }
  ],
  comment: '优惠券表'
});

module.exports = Coupon;