'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 GoodsService extends CrudService {
  constructor(ctx) {
    super(ctx, 'goods');
    this.goodsModel = this.ctx.model.Shop.Goods;
    this.goodsSpecModel = this.ctx.model.Shop.GoodsSpec;
  }
  /**
   *
   * @param {Object} query 查询条件
   * @param query.id 商品数据id
   */
  async goodsDetail({ id }) {
    const { populate } = this.ctx.service.shop.goods.getRefMods();
    let goods = await this.goodsModel.findById(id, { file: 1, tags: 1, name: 1, shot_brief: 1, brief: 1, send_time: 1, shop: 1, view_num: 1 }).populate(populate);
    if (!goods) throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '未找到商品数据');
    goods = JSON.parse(JSON.stringify(goods));
    let specs = await this.goodsSpecModel.find({ goods: id, status: '0' }, { sell_money: 1, flow_money: 1, freight: 1, name: 1, num: 1 });
    specs = JSON.parse(JSON.stringify(specs));
    goods = _.omit(goods, [ 'meta', '__v' ]);
    const shop = _.pick(goods.shop, [ 'logo', 'name', 'person', 'phone', '_id' ]);
    delete goods.shop;

    // goods: 商品信息; specs:商品规格信息; shop:店铺信息
    const returnData = { goods, specs, shop };

    // 添加浏览次数
    await this.goodsModel.updateOne({ _id: id }, { view_num: (goods.view_num || 0) + 1 });
    return returnData;
  }

  async indexGoodsList(condition, { skip = 0, limit = 20 } = {}) {
    condition = this.dealFilter(condition);
    const pipline = [{ $match: { status: { $ne: '0' } } }];
    const { view_num, sell_num, sell_money, name } = condition;
    const sort = {};
    if (view_num) sort.view_num = view_num;
    if (sell_num) sort.sell_num = sell_num;
    if (sell_money) sort.sell_money = sell_money;
    if (name) pipline.push({ $match: { name } });

    pipline.push({ $addFields: { goods_id: { $toString: '$_id' } } });
    // 表关联
    pipline.push({
      $lookup: {
        from: 'goodsSpec',
        localField: 'goods_id',
        foreignField: 'goods',
        as: 'specs',
      },
    });
    // 按照规格平铺数据
    pipline.push({ $unwind: '$specs' });
    // 格式化平铺后的数据
    pipline.push({ $project: { name: 1, view_num: 1, sell_num: 1, file: 1, sell_money: { $toDouble: '$specs.sell_money' } } });
    pipline.push({
      $group: {
        _id: '$_id',
        name: { $first: '$name' },
        view_num: { $first: '$view_num' },
        sell_num: { $first: '$sell_num' },
        sell_money: { $min: '$sell_money' },
        file: { $first: '$file' },
      },
    });
    // 排序处理
    if (view_num) pipline.push({ $sort: { view_num } });
    if (sell_num) pipline.push({ $sort: { sell_num } });
    if (sell_money) pipline.push({ $sort: { sell_money } });
    // 分页处理
    if (parseInt(skip)) pipline.push({ $skip: parseInt(skip) });
    if (parseInt(limit)) pipline.push({ $limit: parseInt(limit) });
    const list = await this.goodsModel.aggregate(pipline);
    return list;
  }
}

module.exports = GoodsService;