// 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")
const Message = require("../../model/message")

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
   */
  class:null,
  students: [],
  presences: [],
  my_presence: null,
  asking_presence: null,
  idStudentMap: {},
  data: {
    loading: true,
    students: [],  // 该课程所有的学生,  元素类型见上文中的student
    student_num: 0,
    current_user: null, //目前登陆的用户,类型为对象，属性有objectId，username, name
    teacher: null, 
    select_stu_id: '',
    //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)
    message_text: "",
    messages: [],
    show_conversation: true
  },
  pull_messages: function(){
    query = new AV.Query("Message");
    query.equalTo("class", this.class);
    query.include("sender");
    set_messages = this.set_messages.bind(this);
    return AV.Promise.all([query.find().then(set_messages), query.subscribe()]).then(([messages, subscription]) => {
      this.messageSubscription = subscription;
      if (this.messageUnbind) this.messageUnbind();
      this.messageUnbind = bind(subscription, messages, set_messages);
    }).catch(error => console.error(error.message));
  },
  set_messages: function(messages){
      console.log("set_messages");
      messages = messages.map(message=>{
        sender = message.get("sender");
		console.log(this.idStudentMap);
		console.log(sender.id);
        console.log(!sender.get("name") && sender.id in this.idStudentMap)
        if(!sender.get("name")&&sender.id in this.idStudentMap){
          sender = this.idStudentMap[sender.id];
        }
        message.set("sender_name", sender.get("name"));
        message.set("sender_username", sender.get("username"));
        return message;
      })
    console.log(jsonify({ messages }));
      this.setData(jsonify({messages}));
      return messages;
  },
  send_message:function(event){
    let {message_text} = this.data;
	if(message_text.trim()==""){return;}
    message = new Message({
      text: message_text,
      class: this.class,
      sender: AV.User.current()
    })
    message.save().then(()=>{
      this.setData({message_text: ""});
      console.log("send_message")
    }).catch(console.error);
  },
  close_conversation: function(event){
    console.log("close conversation");
    console.log(event);
    this.setData({show_conversation: false});
    this.messageSubscription.unsubscribe();
    this.messageUnbind();
  },
  update_message:function({detail:{value}}){
    this.setData({message_text: value});
  },
  enter_setting: function(event){
    wx.navigateTo({
      url: '../classsetting/classsetting?class_id='+this.data.class_id+"&teacher_id="+this.data.teacher.objectId+"&classname="+this.data.class_name,
    })
  },

  enter_detail: function(event){
    wx.navigateTo({
      url: '../classdetail/classdetail?class_id='+this.data.class_id,
    })
  },
  select_stu: function(event){
    id = event.currentTarget.dataset.id;
    if(id=='none'){
      id="";
      }
    this.setData({select_stu_id: id});
  },

  set_isasking: function(event){
    userid = event.currentTarget.dataset.id;
    status = event.currentTarget.dataset.status;
    console.log("set_isasking");
    this.asking_presence = this.presences.filter(presence=>presence.get("user").id==userid)[0];
    console.log(this.asking_presence);
    this.asking_presence.isasking = status;
    wx.showLoading({
      title: '请稍候',
    })
    this.asking_presence.save().then(()=>{
      wx.hideLoading();
    }, ()=>{
      wx.hideLoading();
      wx.showToast({
        title: '操作失败',
        icon: "none"
      })
    });
  },
  add_mark: function(event){
    console.log("add_mark");
    id = event.currentTarget.dataset.id;
    mark = event.currentTarget.dataset.mark;
    console.log(this.presences);
    presence = this.presences.filter(presence => presence.get("user").id == id)[0];
    if(presence==null){
      console.warn("没有选择学生");
    }
    presence.increment("mark", mark).save().then(()=>{
      wx.showToast({
        title: '操作成功',
        icon:"none"
      })
    }).catch(error=>console.error(error.message));
  },

  pull_presence: function(){
    var query = new AV.Query("Presence");
    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(([presences, subscription])=>{
      this.presenceSubscription = subscription;
      if(this.presenceUnbind) this.presenceUnbind();
      console.log("shwo set_presence");
      console.log(presences);
      console.log(set_presence);
      this.presenceUnbind = bind(subscription, presences, set_presence);
    }).catch(error=> console.error(error.message));
  },
  set_presence: function(presences){
    console.log("set_presence");
    console.log(presences);
    pull_presence = this.pull_presence.bind(this);
    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{
          console.warn("pull_presence because new student join");
          pull_presence();
          return;
        }
      }
	  this.idStudentMap[student.id]=student;
      student.set("present", 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;
        this.setData({current_user:student.toJSON()});
      }
      return student;
    });
    this.students = students;
    this.setData(jsonify({students}));
    this.setData({loading:false})
    return presences;
  },

  pull_class: function(class_id){
    query = new AV.Query("Class_");
    query.equalTo("objectId", class_id);
    query.include("teacher");
    return query.find().then((classes) => {
      this.class = classes[0];
      teacher = this.class.get("teacher");
      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) {
    wx.showLoading({
      title: '加载中'
    })
    this.setData({current_user: AV.User.current().toJSON()});
    this.class_id = options.class_id;
    this.class = AV.Object.createWithoutData("Class_", this.class_id);
    this.pull_presence.bind(this)().then((presences) => { 
      this.my_presence.enter(); 
      });
    this.pull_class.bind(this)(this.class_id)
      .then(() => {
        wx.setNavigationBarTitle({
          title: this.data.class_name,
        })
        wx.hideLoading();//better place??
      });
    this.pull_messages.bind(this)();
    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");
    if(this.my_presence){
      console.log("enter class when onShow");
      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.presenceSubscription.unsubscribe();
    this.presenceUnbind();
    this.messageSubscription.unsubscribe();
    this.messageUnbind();
  },

  /**
   * 页面相关事件处理函数--监听用户下拉动作
   */
  onPullDownRefresh: function () {
      console.log(this.idStudentMap);
      this.pull_presence.bind(this)();
      this.pull_class.bind(this)(this.class_id)
        .then(() => {
          wx.setNavigationBarTitle({
            title: this.data.class_name,
          })
        }
        );
  },

  /**
   * 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");
  }
})