'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 TryLessonApplyService extends CrudService {
  constructor(ctx) {
    super(ctx, 'trylessonapply');
    this.model = this.ctx.model.Apply.TryLessonApply;
    this.lessonStudentService = this.ctx.service.business.lessonStudent;
  }
  // 检查该学员是否可以报该节课
  async checkCanUse({ school_id, lesson_id, student_id }) {
    // 先检查是否用过试听机会
    let num = await this.model.count({ school_id, student_id, result: '1' });
    if (num > 0) throw new BusinessError(ErrorCode.DATA_EXISTED, '您已试听过课程,无法再次申请');
    // 该学校,该节课,这名学员. 申请试听的申请状态为 未审核或审核通过时
    num = await this.model.count({ school_id, lesson_id, student_id, result: '0' });
    if (num > 0) throw new BusinessError(ErrorCode.DATA_EXISTED, '本节课的试听申请在审核中,无法重复申请');
    num = await this.model.count({ school_id, lesson_id, student_id, result: '1' });
    if (num > 0) throw new BusinessError(ErrorCode.DATA_EXISTED, '本节课的试听申请已通过,无法重复申请');
    return true;
  }


  async beforeCreate(body) {
    const { school_id, lesson_id, student_id } = body;
    await this.checkCanUse({ school_id, lesson_id, student_id });
    return body;
  }

  async beforeUpdate(filter, update) {
    // 不是 审核通过的情况就不需要继续检查是否使用过试听名额了
    if (update.result !== '1') return { filter, update };
    const data = await this.model.findById(filter.id);
    if (!data) throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '未找到数据');
    const { school_id, student_id } = data;
    const num = await this.model.count({ school_id, student_id, result: '1' });
    if (num > 0) throw new BusinessError(ErrorCode.DATA_EXISTED, '该学员已经在本校试听过课程,无法重复申请');
    return { filter, update };
  }


  // 处理审核成功的情况
  async afterUpdate(filter, body, data) {
    const { result } = data;
    // 审核不通过, 不处理
    if (result !== '1') return data;
    // 通过,则需要在 lessonStudent中添加数据
    const obj = _.pick(data, [ 'school_id', 'lesson_id', 'student_id' ]);
    obj.is_try = '1';
    obj.is_pay = '1';
    await this.lessonStudentService.create(obj);
    return data;
  }
}

module.exports = TryLessonApplyService;