'use strict';


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

class LessonService extends CrudService {
  constructor(ctx) {
    super(ctx, 'lesson');
    this.model = this.ctx.model.Lesson;
    this.tmodel = this.ctx.model.Trainplan;
    this.clamodel = this.ctx.model.Class;
    this.lmodel = this.ctx.model.Lessonmode;
  }

  // 自动排课私有方法
  async autolesson({ id }) {
    // 首先将课程表清空
    const res = await this.tmodel.findById(id);
    if (!res) {
      throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '全年计划信息不存在');
    }
    // 取得课程模板信息
    const _lessonmode = await this.lmodel.findOne({ type: '0' });
    if (!_lessonmode) {
      throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '课程模板信息不存在');
    }
    // 取得模板内容并转化成json
    const lessonmode = JSON.parse(_lessonmode.lessons);
    const terms = res.termnum;
    // 循环取得所有期
    for (const elm of terms) {
      // 根据期id清空课程表
      await this.model.deleteMany({ termid: elm.id });
      // 清空成功后，循环取得当前期下所有批次信息
      const batchs = elm.batchnum;
      for (const batch of batchs) {
        // 取得当前批次开始结束日期，并根据日期取得所有天数
        const sedays = await this.getAllDays(batch.startdate, batch.enddate);
        // 根据批次取得当前批次下所有班级
        const _classs = await this.clamodel.find({ planid: id, termid: elm.id, batchid: batch.id });
        // 循环班级
        for (const cla of _classs) {
          // 记录天数
          let i = 1;
          // 循环天数
          const newlesson = [];
          for (const day of sedays) {
            // 循环课程模板，将模板信息排入班级课程表中
            for (const lessm of lessonmode) {
              // 循环插入模板信息
              if (lessm['day' + i] !== '--') {
                let _subid = '';
                if (lessm['day' + i + 'type'] === '课程') {
                  _subid = lessm['day' + i + 'subid'];
                } else {
                  _subid = '';
                }
                let allday = 0;
                if (i === 6) {
                  allday = _lessonmode.allday;
                }
                const data = { subid: _subid, subname: lessm['day' + i], date: day, time: lessm.time, day: allday };
                newlesson.push(data);
              }
            }
            i = i + 1;
          }
          const newdata = { termid: elm.id, batchid: batch.id, classid: cla.id, lessons: newlesson };
          // 将课程信息填入课程表
          await this.model.create(newdata);
        }


      }
    }
  }

  // 取得日期间所有日期
  async getAllDays(begin_date, end_date) {
    const errArr = [],
      resultArr = [],
      dateReg = /^[2]\d{3}-[01]\d-[0123]\d$/;

    if (typeof begin_date !== 'string' || begin_date === '' || !dateReg.test(begin_date)) {
      return errArr;
    }

    if (typeof end_date !== 'string' || end_date === '' || !dateReg.test(end_date)) {
      return errArr;
    }

    try {
      const beginTimestamp = Date.parse(new Date(begin_date)),
        endTimestamp = Date.parse(new Date(end_date));

      // 开始日期小于结束日期
      if (beginTimestamp > endTimestamp) {
        return errArr;
      }

      // 开始日期等于结束日期
      if (beginTimestamp === endTimestamp) {
        resultArr.push(begin_date);
        return resultArr;
      }

      let tempTimestamp = beginTimestamp,
        tempDate = begin_date;


      // 新增日期是否和结束日期相等， 相等跳出循环
      while (tempTimestamp !== endTimestamp) {
        resultArr.push(tempDate);

        // 增加一天
        tempDate = moment(tempTimestamp)
          .add(1, 'd')
          .format('YYYY-MM-DD');

        // 将增加时间变为时间戳
        tempTimestamp = Date.parse(new Date(tempDate));
      }

      // 将最后一天放入数组
      resultArr.push(end_date);
      return resultArr;

    } catch (err) {
      return errArr;
    }
  }

}

module.exports = LessonService;