'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 OrderService extends CrudService {
  constructor(ctx) {
    super(ctx, 'order');
    this.orderModel = this.ctx.model.Trade.Order;
  }

  async allOrder(query = {}) {
    const { skip, limit } = query;
    const pipeline = [];
    const step1 = [
      { $addFields: { order_id: { $toString: '$_id' } } },
      {
        $lookup: {
          from: 'orderDetail',
          localField: 'order_id',
          foreignField: 'order',
          as: 'orderDetails',
        },
      },
    ];
    pipeline.push(...step1);
    const step2 = [
      {
        $project: {
          data: {
            $cond: {
              if: { $gt: [{ $size: '$orderDetails' }, 0 ] },
              then: '$orderDetails',
              else: '$$CURRENT',
            },
          },
        },
      },
    ];
    pipeline.push(...step2);
    pipeline.push({ $unwind: '$data' });
    pipeline.push({ $replaceRoot: { newRoot: '$data' } });
    const qp = _.cloneDeep(pipeline);
    qp.push({ $sort: { 'meta.createdAt': -1 } });
    if (skip && limit) qp.push({ $skip: parseInt(skip) }, { $limit: parseInt(limit) });
    const data = await this.orderModel.aggregate(qp);
    const tr = await this.orderModel.aggregate([ ...pipeline, { $count: 'total' }]);
    for (const i of data) {
      const { pay, goods } = i;
      if (pay) {
        // 这个是order表的数据,需要用order的计算方式
        const buy_num_total = goods.reduce(
          (p, n) =>
            this.ctx.plus(
              p,
              n.goods.reduce((np, ng) => this.ctx.plus(np, ng.buy_num), 0)
            ),
          0
        );
        i.buy_num_total = buy_num_total;
        i.real_pay = _.get(i, 'pay.pay_money');
      } else {
        // 是orderDetail表的数据,需要用orderDetail的计算方式
        const real_pay = this.ctx.service.util.orderDetail.computedRealPay(i);
        i.real_pay = real_pay;
        i.buy_num_total = goods.reduce((p, n) => this.ctx.plus(p, n.buy_num), 0);
      }
    }
    const total = _.get(_.head(tr), 'total', 0);
    return { data, total };
  }
}

module.exports = OrderService;