'use strict';

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

class OrderService extends CrudService {
  constructor(ctx) {
    super(ctx, 'order');
    this.model = this.ctx.model.Order;
  }
  /**
   * 新添订单
   * @param {Object} data 订单数据
   */
  async create(data) {
    const res = await this.model.create(data);
    // 复制进split中
    if (!res) throw new BusinessError(ErrorCode.SERVICE_FAULT, '订单创建失败');
    await this.copyToSplit(res._id);
    try {
      this.record(res._id, { method: 'create' });
    } catch (error) {
      this.logger.error(`订单id:${res.id}记录创建失败:${error.toString()}`);
    }
    return res;
  }

  /**
   * 修改订单
   * @param {Object} { id, ...data } 要修改的订单数据
   */
  async update({ id, ...data }) {
    const res = await this.model.findById(id);
    const { goods: newGoods, ...info } = data;
    let { goods: oldGoods, split } = res;
    if (oldGoods) oldGoods = JSON.parse(JSON.stringify(oldGoods));
    if (split) split = JSON.parse(JSON.stringify(split));
    // 找到删除项
    // oldGoods中有,但是newGoods中却没有的数据,就是要删除的;且需要检验被删除的数据有没有被拆分
    oldGoods = oldGoods.map(og => {
      const need_delete = newGoods.find(f => ObjectId(f._id).equals(og._id));
      if (!need_delete) {
        const sobj = split.find(f => ObjectId(f.pid).equals(og._id));
        if (sobj) {
          // 查找其有没有被拆分
          const r = split.find(f => ObjectId(f.pid).equals(sobj._id));
          if (r) throw new BusinessError(ErrorCode.DATA_INVALID, '无法删除已被拆分过的货物');
          const s_index = split.findIndex(f => ObjectId(f.pid).equals(og._id));
          split.splice(s_index, 1);
        }
        return undefined;
      }
      return og;
    });
    oldGoods = _.compact(oldGoods);
    // 判断是否有修改项
    const updateRes = await this.goodsUpdate(oldGoods, newGoods, split);
    if (updateRes) {
      const { oldGoods: ogs, split: splist } = updateRes;
      if (ogs) oldGoods = ogs;
      if (splist) split = splist;
    }
    // 判断有没有新添的数据
    const addGoods = newGoods.filter(f => !f._id);
    if (addGoods.length > 0) {
      // 有新增货物项
      // TODO,复制到split中和oldGoods中
      for (const ng of addGoods) {
        oldGoods.push(ng);
      }
    }
    res.goods = oldGoods;
    res.split = split;
    // console.group('oldGoods');
    // console.log(oldGoods);
    // console.groupEnd();
    // console.group('split');
    // console.log(split);
    // console.groupEnd();
    await this.model.update({ _id: ObjectId(id) }, info);
    await res.save();
    this.copyToSplit(id);
    try {
      this.record(res._id, { method: 'update' });
    } catch (error) {
      this.logger.error(`订单id:${res.id}记录创建失败:${error.toString()}`);
    }
    return;
  }

  /**
   * 检查并处理有修改的货物:拆分就不允许修改了
   * @param {Array} oldGoods 查出修改前的货物列表
   * @param {Array} newGoods 修改后的货物列表
   * @param {Array} split 原拆分货物列表,用来检查是否可以修改
   */
  async goodsUpdate(oldGoods, newGoods, split) {
    oldGoods = oldGoods.map(og => {
      const is_split = split.find(f => ObjectId(f.pid).equals(og._id) && f.type === '1');
      if (is_split) return og;
      // 没有拆分,可以直接更换
      const ng = newGoods.find(f => ObjectId(f._id).equals(og._id));
      if (ng) return { ...ng, update: true };
      return og;
    });
    // 修改拆分货物列表
    const toUpdateSplit = oldGoods.filter(f => f.update);
    split = split.map(i => {
      const res = toUpdateSplit.find(f => ObjectId(f._id).equals(i.pid));
      if (res) {
        const obj = this.goodsCopy(res);
        return obj;
      }
      return i;
    });
    // 将oldGoods的update摘出去
    oldGoods = oldGoods.map(i => _.omit(i, [ 'update' ]));
    return { oldGoods, split };
  }

  /**
   * 将货物复制成拆分货物的数据并返回
   * @param {Object} data 货物列表的每项
   * @return split
   */
  goodsCopy(data) {
    const split = _.pick(data, [
      'name',
      'number',
      'weight',
      'volume',
      'transport_type',
      'remark',
    ]);
    split.pid = data._id;
    return split;
  }
  /**
   * 根据订单id,复制货物 到 拆分货物,只是复制,其他操作在各自的方法中,这里只是复制
   * @param {String} id 订单id
   */
  async copyToSplit(id) {
    const order = await this.model.findById(id);
    if (!order) throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '未找到订单');
    const { goods, split } = order;
    for (const g of goods) {
      const has = split.find(f => ObjectId(f.pid).equals(g._id));
      if (!has) {
        order.split.push(this.goodsCopy(g));
      }
    }
    await order.save();

  }


  /**
   * 订单操作记录
   * @param {String} id 订单id
   * @param {Object} {method:方法} 参数
   */
  async record(id, { method }) {
    const order = await this.model.findById(id);
    if (!order) throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '未找到订单');
    const { authorization } = this.ctx.request.header;
    let user = decodeURI(authorization);
    if (!user) { throw new BusinessError(ErrorCode.USER_NOT_EXIST, '未找到操作人'); }
    user = JSON.parse(user);
    const { id: userid, name: username } = user;
    const record = { opera: username, operaid: userid };
    // 创建记录
    if (method === 'create') record.message = `${username}创建订单`;
    else if (method === 'update') record.message = `${username}修改订单`;
    else if (method === 'in') record.message = `${username}修改收入`;
    else if (method === 'out') record.message = `${username}修改支出`;
    else if (method === 'split') record.message = `${username}拆分货物`;
    order.record.push(record);
    await order.save();
  }
}

module.exports = OrderService;