ai_dianshang/miniprogram/pages/coupon/coupon-center/index.js

import { request } from '../../../services/_utils/request';

Page({
  data: {
    availableCoupons: [], // 可领取的优惠券列表
    loading: false,
    refreshing: false,
  },

  onLoad() {
    this.fetchAvailableCoupons();
  },

  onShow() {
    // 页面显示时刷新数据，以防用户已领取某些优惠券
    this.fetchAvailableCoupons();
  },

  // 刷新数据
  onRefresh() {
    this.setData({ refreshing: true });
    this.fetchAvailableCoupons().finally(() => {
      this.setData({ refreshing: false });
    });
  },

  // 获取可领取优惠券列表
  async fetchAvailableCoupons() {
    try {
      this.setData({ loading: true });
      
      const response = await request({
        url: '/coupons',
        method: 'GET'
      });

      const coupons = response.data || [];
      const formattedCoupons = this.formatCoupons(coupons);
      this.setData({ 
        availableCoupons: formattedCoupons,
        loading: false 
      });
    } catch (error) {
      console.error('获取可领取优惠券失败:', error);
      this.setData({ loading: false });
      wx.showToast({
        title: '获取优惠券失败',
        icon: 'none'
      });
    }
  },

  // 格式化优惠券数据
  formatCoupons(coupons) {
    return coupons.map(coupon => {
      return {
        id: coupon.id,
        name: coupon.name,
        type: coupon.type,
        value: coupon.value,
        minAmount: coupon.min_amount,
        desc: this.getCouponDesc(coupon),
        timeLimit: this.formatTimeLimit(coupon.start_time, coupon.end_time),
        status: 'default', // 可领取状态
        totalCount: coupon.total_count,
        usedCount: coupon.used_count,
        remainingCount: coupon.total_count > 0 ? coupon.total_count - coupon.used_count : -1,
        isReceived: coupon.is_received || false // 是否已领取
      };
    });
  },

  // 获取优惠券描述
  getCouponDesc(coupon) {
    if (coupon.type === 1) { // 满减券
      if (coupon.min_amount > 0) {
        return `满${(coupon.min_amount / 100).toFixed(0)}元减${(coupon.value / 100).toFixed(0)}元`;
      }
      return `立减${(coupon.value / 100).toFixed(0)}元`;
    } else if (coupon.type === 2) { // 折扣券
      return `${coupon.value / 10}折`;
    } else if (coupon.type === 3) { // 免邮券
      return '免运费';
    }
    return coupon.description || '优惠券';
  },

  // 格式化时间限制
  formatTimeLimit(startTime, endTime) {
    const start = new Date(startTime);
    const end = new Date(endTime);
    const formatDate = (date) => {
      const year = date.getFullYear();
      const month = String(date.getMonth() + 1).padStart(2, '0');
      const day = String(date.getDate()).padStart(2, '0');
      return `${year}.${month}.${day}`;
    };
    return `${formatDate(start)} - ${formatDate(end)}`;
  },

  // 领取优惠券
  async receiveCoupon(e) {
    const { couponid } = e.currentTarget.dataset;
    if (!couponid) return;

    // 检查优惠券是否还有库存
    const coupon = this.data.availableCoupons.find(c => c.id == couponid);
    if (!coupon || coupon.remainingCount === 0) {
      wx.showToast({
        title: '优惠券已抢完',
        icon: 'none'
      });
      return;
    }

    // 检查是否已领取
    if (coupon.isReceived) {
      wx.showToast({
        title: '您已领取过该优惠券',
        icon: 'none'
      });
      return;
    }

    try {
      wx.showLoading({ title: '领取中...' });
      
      const response = await request({
        url: `/coupons/${couponid}/receive`,
        method: 'POST'
      });

      wx.hideLoading();

      wx.showToast({
        title: '领取成功',
        icon: 'success'
      });
      
      // 设置刷新标识，确保返回其他页面时能刷新优惠券数据
      wx.setStorageSync('shouldRefreshCoupons', true);
      
      // 重新获取优惠券列表
      this.fetchAvailableCoupons();
    } catch (error) {
      wx.hideLoading();
      console.error('领取优惠券失败:', error);
      wx.showToast({
        title: error.message || '领取失败，请重试',
        icon: 'none'
      });
    }
  },

  // 下拉刷新
  onPullDownRefresh() {
    this.setData({ refreshing: true });
    this.fetchAvailableCoupons().finally(() => {
      this.setData({ refreshing: false });
      wx.stopPullDownRefresh();
    });
  },

  // 查看优惠券详情
  viewCouponDetail(e) {
    const { couponid } = e.currentTarget.dataset;
    wx.navigateTo({
      url: `/pages/coupon/coupon-detail/index?id=${couponid}`
    });
  },


});