'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');
const { ObjectId } = require('mongoose').Types;
//
class OrderDetailService extends CrudService {
  constructor(ctx) {
    super(ctx, 'orderdetail');
    this.model = this.ctx.model.Trade.OrderDetail;
    this.orderModel = this.ctx.model.Trade.Order;
  }

  /**
   * 创建:用户支付完成后的订单
   * @param {Object} body 请求参数体
   * @param body.order_id 下单的id
   * @param {Transaction} tran 数据库事务实例
   */
  async create({ order_id }, tran) {
    assert(order_id, '缺少支付订单信息');
    // if (!tran) throw new BusinessError(ErrorCode.DATA_INVALID, '支付成功添加积分:缺少事务参数');
    const order = await this.orderModel.findById(order_id);
    if (!order) throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '未找到支付订单的数据');
    const { customer, address, goods, no, status, buy_time, pay, total_detail: otd } = order;
    if (status === '0') throw new BusinessError(ErrorCode.DATA_INVALID, '订单未支付');
    const orderDetailData = { customer, address, order: order_id, buy_time, pay_time: _.get(pay, 'pay_time'), status };
    // 补全 shop, goods, total_detail;
    // const arr = [];
    // 分订单计数器
    let noTimes = 1;
    for (const s of goods) {
      const shop = _.get(s, 'shop');
      const goodsList = _.get(s, 'goods', []);
      const detailNo = `${no}-${noTimes}`;
      const total_detail = this.getTotalDetail(goodsList);
      // 优惠部分分割
      if (_.get(otd, 'discount_detail')) {
        // 如果有优惠部分,那就得找,优惠里面有没有对应的商品规格
        const discount_detail = this.getGoodsListDiscountDetail(goodsList, _.get(otd, 'discount_detail'));
        total_detail.discount_detail = discount_detail;
      }
      noTimes++;
      const obj = { ...orderDetailData, shop, goods: goodsList, no: detailNo, total_detail };
      tran.insert('OrderDetail', obj);
      // arr.push(obj);
    }
    // await this.model.insertMany(arr);
  }

  /**
   * 将商品规格列表中,优惠的部分提取出来,分单用
   * @param {Array} goodsList 某店的商品列表
   * @param {Object} odd discount_detail 支付订单的优惠券设置
   */
  getGoodsListDiscountDetail(goodsList, odd) {
    const result = {};
    for (const uc_id in odd) {
      const detail = odd[uc_id];
      const obj = {};
      for (const g of goodsList) {
        const { _id } = g;
        const gdd = detail[_id];
        if (gdd) obj[_id] = gdd;
      }
      result[uc_id] = obj;
    }
    return result;
  }

  /**
   * 计算某店铺的金额总计
   * @param {Array} goodsList 商品规格列表
   */
  getTotalDetail(goodsList) {
    const goods_total = goodsList.reduce((p, n) => this.ctx.plus(p, this.ctx.multiply(n.sell_money, n.buy_num)), 0);
    const freight_total = goodsList.reduce((p, n) => this.ctx.plus(p, this.ctx.multiply(n.freight, n.buy_num)), 0);
    return { goods_total, freight_total };
  }

  async fetch(filter) {
    assert(filter);
    filter = await this.beforeFetch(filter);
    const { _id, id } = filter;
    if (_id || id) filter = { _id: ObjectId(_id || id) };
    const { populate } = this.getRefMods();
    let res = await this.model.findOne(filter).populate(populate).exec();
    res = await this.afterFetch(filter, res);
    return res;
  }
}

module.exports = OrderDetailService;