'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 LessonService extends CrudService {
  constructor(ctx) {
    super(ctx, 'lesson');
    this.model = this.ctx.model.Business.Lesson;
    this.lessonCoachModel = this.ctx.model.Business.LessonCoach;
    this.lessonStudentModel = this.ctx.model.Business.LessonStudent;
    this.coachInBillService = this.ctx.service.business.coachInBill;
  }

  /**
   * 处理下课的课程进行结算
   * @param {Object} filter 修改条件
   * @param {Object} body 修改内容
   * @param {Object} data 修改后的结果
   * @return {Object} 返回整理后的内容
   */
  async afterUpdate(filter, body, data) {
    const { _id: lesson_id, type, status, school_id } = data;
    if (status !== '4') return data;
    const arr = [];

    if (type === '0') {
      // 公开课,每个教师都带着自己的金额. 按 人头数 * 单价 算钱
      const lessonCoachList = await this.lessonCoachModel.find({ lesson_id });
      // 这节课付了款的学生总数
      const studentNum = await this.lessonStudentModel.count({ lesson_id, is_pay: '1' });
      const obj = { lesson_id, type, school_id };
      for (const c of lessonCoachList) {
        const { coach_id, money } = c;
        const total = money * studentNum;
        arr.push({ ...obj, coach_id, money: total });
      }
    } else {
      // 私教课, 按学生实际缴费
      const lessonCoach = await this.lessonCoachModel.findOne({ lesson_id });
      const studentList = await this.lessonStudentModel.find({ lesson_id });
      const obj = { lesson_id, type, school_id };
      obj.coach_id = lessonCoach.coach_id;
      const total = studentList.reduce((p, n) => p + (n.money || 0), 0);
      obj.money = total;
      arr.push(obj);
    }

    // 创建,如果有该学校,这节课的这个教练已经有数据了,就不需要生成了
    for (const i of arr) {
      try {
        await this.coachInBillService.create(i);
      } catch (error) {
        // 不是数据有问题,就是有数据了,要不一般不会出错
      }
    }

    return data;
  }
}

module.exports = LessonService;