server/app/service/util/orderDetail.js

'use strict';
const { CrudService } = require('naf-framework-mongoose-free/lib/service');
const { BusinessError, ErrorCode } = require('naf-core').Error;
const _ = require('lodash');
const assert = require('assert');

//
class OrderDetailService extends CrudService {
  constructor(ctx) {
    super(ctx, 'orderdetail');
    this.orderDetailModel = this.ctx.model.Trade.OrderDetail;
  }
  /**
   * 计算订单详情实际支付金额
   * @param {Object} data 订单详情数据
   * @return {Number} 实际支付金额
   */
  computedRealPay(data) {
    let priceKey;
    if (_.get(data, 'type', '0') === '1') priceKey = 'ggrp';
    else priceKey = 'grp';
    let detail = this.moneyDetail(data);
    detail = Object.values(detail);
    const realPay = detail.reduce((p, n) => this.ctx.plus(p, _.get(n, priceKey, 0)), 0);
    return realPay;
  }
  /**
   * 按商品计算该订单详情的价格明细
   * @param {Object} data 订单详情数据
   * @return {Object} 返回{
   *  规格id:{
   *    sm: 规格正常销售价格(sell_money),
   *    f: 规格运费(freight),
   *    bn: 购买数量(buy_num),
   *    st: 规格正常销售总价(sell_total: sm * bn)
   *    ft: 规格运费总价(freight_total: f * bn)
   *    gt: 商品支付原价(goods_total: st + ft)
   *    dd: {
   *      key:优惠券id,
   *      value:优惠价格
   *    },
   *    dt: 优惠总价(d_detail的value之和)
   *    grp:商品实际支付价格(goods_real_pay: gt - dt)
   *    gsm:规格团购销售价格(group_sell_money)
   *    gst: 规格团购销售总价(group_sell_total: gsm * bn)
   *    ggt: 商品团购支付原价(goods_group_total: gst + ft)
   *    ggrp: 商品团购实际支付价格(goods_group_real_pay: ggt - dt)
   *
   *  }
   * }
   */
  moneyDetail(data) {
    if (!data) throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '未找到订单信息');
    // 优惠部分
    const ddt = _.get(data, 'total_detail.discount_detail', {});
    const goods = _.get(data, 'goods', []);
    const result = {};
    for (const g of goods) {
      const { sell_money: sm, freight: f, buy_num: bn, group_config, _id } = g;
      const st = this.ctx.multiply(sm, bn);
      const ft = this.ctx.multiply(f, bn);
      const gt = this.ctx.plus(st, ft);
      const dd = {};
      for (const uc_id in ddt) {
        const detail = _.get(ddt, uc_id, {});
        const value = detail[_id];
        if (value) dd[uc_id] = value;
      }
      const dt = Object.values(dd).reduce((p, n) => this.ctx.plus(p, n), 0);
      const grp = this.ctx.minus(gt, dt);
      let obj = { sm, f, bn, st, ft, gt, dd, dt, grp };
      const gsm = _.get(group_config, 'money');
      if (gsm) {
        const gst = this.ctx.multiply(gsm, bn);
        const ggt = this.ctx.plus(gst, ft);
        const ggrp = this.ctx.minus(ggt, dt);
        obj = { ...obj, gsm, gst, ggt, ggrp };
      }
      result[_id] = obj;
    }
    return result;
  }
}

module.exports = OrderDetailService;