'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 moment = require('moment');
const { ObjectId } = require('mongoose').Types;

//
class StoreGoodsService extends CrudService {
  constructor(ctx) {
    super(ctx, 'storegoods');
    this.model = this.ctx.model.User.StoreGoods;
    this.goodsModel = this.ctx.model.Shop.Goods;
  }
  async create({ goods }) {
    assert(goods, '缺少商品信息');
    const customer = _.get(this.ctx, 'user._id');
    assert(customer, '缺少用户信息');
    let data = await this.model.findOne({ customer, goods });
    if (data) {
      await this.model.deleteOne({ customer, goods });
      return { msg: '取消收藏', result: false };
    }
    data = await this.model.create({ customer, goods, time: moment().format('YYYY-MM-DD HH:mm:ss') });
    return { msg: '收藏成功', result: true };
  }
  // 检查是否收藏商品
  async check({ goods, customer }) {
    const num = await this.model.count({ goods, customer });
    return num > 0;
  }

  // 用户查看收藏商品
  async userView(query = {}, { skip, limit } = {}) {
    const customer = _.get(this.ctx, 'user._id');
    assert(customer, '缺少用户信息');
    const { view_num, sell_num, sell_money, name, shop, time } = query;
    const searchPips = [];
    if (name) searchPips.push({ $match: { name: new RegExp(name) } });
    if (shop) searchPips.push({ $match: { shop } });
    const pipline = [{ $match: { customer } }];
    // 联表-商品
    pipline.push({ $addFields: { goods_id: { $toObjectId: '$goods' } } });
    pipline.push({
      $lookup: {
        from: 'goods',
        localField: 'goods_id',
        foreignField: '_id',
        as: 'gi',
      },
    });
    // 平铺
    pipline.push({ $unwind: '$gi' });
    // 格式化数据
    pipline.push({
      $project: {
        _id: '$gi._id',
        shop: '$gi.shop',
        time: 1,
        name: '$gi.name',
        file: '$gi.file',
        view_num: '$gi.view_num',
        status: '$gi.status',
      },
    });
    // 商品条件查询
    if (searchPips.length > 0) pipline.push(...searchPips);
    // 联表-规格
    pipline.push({ $addFields: { goods_id: { $toString: '$_id' } } });
    pipline.push({
      $lookup: {
        from: 'goodsSpec',
        localField: 'goods_id',
        foreignField: 'goods',
        as: 'specs',
      },
    });
    // 平铺
    pipline.push({ $unwind: '$specs' });
    // 格式化
    pipline.push({
      $project: {
        time: 1,
        _id: 1,
        shop: 1,
        name: 1,
        file: 1,
        view_num: 1,
        status: 1,
        sell_money: '$specs.sell_money',
      },
    });
    // 分组取最低价
    pipline.push({
      $group: {
        _id: '$_id',
        name: { $first: '$name' },
        view_num: { $first: '$view_num' },
        sell_money: { $min: '$sell_money' },
        file: { $first: '$file' },
        time: { $first: '$time' },
      },
    });
    const qPipline = _.cloneDeep(pipline);
    // 排序处理
    const sort = { };
    if (view_num) sort.view_num = parseInt(view_num);
    if (sell_num) sort.sell_num = parseInt(sell_num);
    if (sell_money) sort.sell_money = parseInt(sell_money);
    sort.time = parseInt(time) || -1;
    qPipline.push({ $sort: sort });
    if (parseInt(skip)) qPipline.push({ $skip: parseInt(skip) });
    if (parseInt(limit)) qPipline.push({ $limit: parseInt(limit) });
    const list = await this.model.aggregate(qPipline);
    const tPipline = _.cloneDeep(pipline);
    tPipline.push({ $count: 'total' });
    const total = await this.model.aggregate(tPipline);
    return { list, total: _.get(_.head(total), 'total', 0) };
  }

}

module.exports = StoreGoodsService;