// pages/classroom/classroom.js
const AV = require("../../lib/av-live-query-weapp-min")
const { jsonify } = require('../../utils/leancloudutils');
const bind = require("../../lib/live-query-binding")

Page({
  /**
   页面的初始数据
   students: 该课程所有的学生
    元素student
      student.objectId  该学生的主键，唯一
      student.username 学生的用户名，是唯一，就像微信号一样
      student.name  学生的姓名
      student.present 是否出席
      student.isasking :0:没有提问,1:提问,2:请回答
   */
  presence: null,
  origin_presences: [],
  students: [],
  class: null,
  presences : [],
  class_id: null,
  asking_presence: null,
  my_presence: null,
  data: {
    //以下数据的同步由该代码文件实现，数据的呈现由classroom.wxml实现
    students: [],  // 该课程所有的学生,  元素类型见上文中的student
    current_user: null, //目前登陆的用户,类型为对象，属性有objectId，username, name
    teacher: null, 
    //该课程教员,类型为对象
    //请在进入界面时判断用户是否为教员以给与权限或更改界面
    //属性如下：objectId, username, name
    class_name: "", //课程名称
    class_id: "", //该课程的主键（编号)
  },
  sco1: function () {
    //打1分的函数
  },
  sco2: function () {
    //打2分的函数
  },
  sco3: function () {
    //打3分的函数
  },
  ask: function (event) {
    //学生提问的函数
    console.log(event);
    set_asking()
  },
  rep: function (event) {
    console.log(event);
    //点这个学生要回答他问题的函数
  },
  set_asking: function(userid, status){
    this.asking_present = this.presents.filter(present=>present.get("user").id==userid)[0];
    this.asking_present.isasking = status;
    this.asking_present.save();
  },
  add_mark: function(mark){
    if(this.asking_present==null){
      console.warn("没有选择学生");
    }else{
      user = this.asking_present.get("user");
      studentClassMap = this.studentClassMaps.filter(studentClassMap=>studentClassMap.get("user"))
    }
  },

  pull_presence: function(){
    var query = new AV.Query("Presence");
    //console.log(this.class);
    query.equalTo("class", this.class);
    query.include("user");
    set_presence = this.set_presence.bind(this);
    return AV.Promise.all([query.find().then(set_presence), query.subscribe()]).then(([presents, subscription])=>{
      this.PresentSubscription = subscription;
      if(this.presentUnbind) this.presentUnbind();
      this.presentUnbind = bind(subscription, presents, set_presence);
    }).catch(error=> console.error(error.message));
  },
  set_presence: function(presences){
    console.log("set_presence");
    console.log(presences);
    this.presences = presences;
    students = this.presences.map((presence)=>{
      student = presence.get("user");
      if(student.get("username")==null){
        students = this.students.filter(stu=>stu.id==student.id)
        if(students.length==1){
          student = students[0];
        }else{
          student.fetch();
        }
      }
      student.set("ispresent", presence.get("present"));
      student.set("isasking",presence.get("isasking"));
      student.set("mark", presence.get("mark"))
      if(student.id==AV.User.current().id){
        this.my_presence = presence;
      }
      return student;
    });
    this.students = students;
    console.log(students);
    this.setData(jsonify({students}));
    return presences;
  },

  fetch_class: function(class_id){
    this.class = AV.Object.createWithoutData("Class_", class_id);
    //this.class.include("teacher");
    return this.class.fetch().then((class_) => {
      //console.log(this.class);
      teacher = this.class.get("teacher");
      console.log("fetch_class");
      //console.log(teacher);
      if(typeof teacher.toJson == "function"){
        teacher = teacher.toJson()
      }
      this.setData({
        class_name: this.class.get("name"),
        class_id: this.class.get("objectId"),
        teacher: teacher
      });
    }).catch(error=>console.error(error.message))
  },

  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function (options) {
    this.setData({current_user: AV.User.current()});
    this.class_id = options.class_id;
    this.fetch_class.bind(this)(this.class_id).then(this.pull_presence.bind(this)).then((presences)=>{this.origin_presences=presences, this.my_presence.enter()});
    console.log("onLoad");
  },

  /**
   * 生命周期函数--监听页面初次渲染完成
   */
  onReady: function () {
    console.log("onReady");
  },

  /**
   * 生命周期函数--监听页面显示
   */
  onShow: function () {
    console.log("onShow");
    console.log("enter class when onShow");
    console.log(AV.User.current());
    if(this.my_presence){
      this.my_presence.enter();
    }
  },

  /**
   * 生命周期函数--监听页面隐藏
   */
  onHide: function () {
    this.my_presence.leave();
    console.log("onHide");
  },

  /**
   * 生命周期函数--监听页面卸载
   */
  onUnload: function () {
    this.my_presence.leave();
    console.log("onUnload");
    this.PresentSubscription.unsubscribe();
    this.presentUnbind();
  },

  /**
   * 页面相关事件处理函数--监听用户下拉动作
   */
  onPullDownRefresh: function () {
      this.pull_presence.bind(this)();
  },

  /**
   * 页面上拉触底事件的处理函数
   */
  onReachBottom: function () {

  },

  /**
   * 用户点击右上角分享
   */
  onShareAppMessage: function () {
    console.log("onShareAppMessage");
  }
})