// 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");
const Grade = require("../../model/grade");
const Presence = require("../../model/presence");
const app = getApp();

Page({
  students: [],
  presences: [],
  my_presence: null,
  data: {
    course: null,
    loading: true,
    students: [], 
    select_stu_login:"",
    message_text: "",
    messages: [],
    show_conversation: true
  },
  enter_mark_detail({currentTarget:{dataset}}){
    wx.navigateTo({
      url: '../mark_detail/mark_detail?course_id='+this.course_id,
    })
  },
  pull_messages: function(){
    let query = new AV.Query("Message");
    query.equalTo("edu_course_id", this.course_id);
    const 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=>{
        let sender_login = message.edu_account_login;
        let senders_ = this.students.filter(student=>student.login==sender_login)
        if(senders_.length==1){
          message.set("sender_name", senders_[0]["name"]);
        }
        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;}
    let message = new Message({
      text: message_text,
      edu_account_login: this.current_user.login,
      edu_course_id: this.course_id,
      sender_name: this.current_user.real_name||"未命名",
    });
    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});
  },
  select_stu: function(event){
    let login = event.currentTarget.dataset.login;
    console.log(event);
    this.setData({select_stu_login: login});
    console.log(this.data.select_stu_login);
  },
  set_isasking: function(event){
    let login = event.currentTarget.dataset.login;
    let status = event.currentTarget.dataset.status;
    console.log("set_isasking");
    console.log(this.presences);
    let asking_presence = this.presences.filter(presence=>presence.get("edu_account_login")==login)[0];
    console.log(asking_presence);
    asking_presence.isasking = status;
    wx.showLoading({
      title: '请稍候',
    });
    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");
    let login = event.currentTarget.dataset.login;
    let mark = event.currentTarget.dataset.mark;
    console.log(this.presences);
    let presence = this.presences.filter(presence => presence.get("edu_account_login") == login)[0];
    if(presence==null){
      console.warn("没有学生Presence");
      presence = new Presence({
        edu_account_login: login,
        edu_course_id: this.course_id,
        present: false,
        mark: 0
      })
    }
    presence.increment("mark", mark);
    var grade = new Grade();
    console.log(grade);
    grade.edu_account_login = login;
    grade.edu_course_id = this.course_id;
    grade.mark = mark;
    presence.save().then(()=>{grade.save()}).then(()=>{
      wx.showToast({
        title: '操作成功',
        icon:"none"
      })
    }
    ).catch(console.error);
  },

  pull_presence: function(){
    let query = new AV.Query("Presence");
    query.equalTo("edu_course_id", this.course_id);
    const 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("show set_presence");
      console.log(presences);
      console.log(set_presence);
      this.presenceUnbind = bind(subscription, presences, set_presence);
    })
  },
  set_presence: function(presences){
    this.presences = presences;
    console.log("set_presence");
    console.log(presences);
    //console.log("Set_presence");
    //console.log(this);
    let students = this.students.concat().map(student=>{
      student["mark"]=0;
      student["isasking"]=0;
      student["present"]=false;
      return student;
    });//拷贝
    for(var presence of presences){
      let student_login = presence.get("edu_account_login");
      if(presence.edu_account_login==this.current_user.login){
        this.my_presence = presence;
      }
      for(var i=0;i<students.length;i++){
        if(students[i].login==student_login){
          students[i]["present"] = presence.present;
          students[i]["isasking"] = presence.isasking;
          students[i]["mark"] = presence.mark;
          break;
        }
      }
    }
    console.log(students);
    let stus = students.filter(student => student.login == app.client.current_user.login);
    if(stus.length==1){
      this.setData({current_user: stus[0]});
    }
    this.setData({students: students});
	  return presences;
  },

/**new api below: */
  pull_course: function(){
    return app.client.get_course_info({course_id: this.course_id})
    .then(res=>{
      this.setData({course: res.data});
      wx.setNavigationBarTitle({
        title: this.data.course.name
      })
    }).catch(console.error);
  },
  pull_students: function(){
    return app.client.get_course_students({course_id: this.course_id})
    .then(res=>{
      this.students = res.data.students;
    }).catch(console.error);
  },

  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function (options) {
    this.course_id = options.id;
    this.current_user = app.client.current_user;
    wx.showLoading({
      title: '加载中',
    });
    this.pull_course();
    this.pull_students()
    .then(()=>{
      this.pull_presence()
        .then(() => {
          if (this.my_presence == null) {
            this.my_presence = new Presence({
              edu_account_login: this.current_user.login,
              edu_course_id: this.course_id,
              present: true
            });
            this.my_presence.save();
          }else{
            this.my_presence.enter();
          }
        })
        .then(() => {
          wx.hideLoading();
          this.setData({ loading: false });
        })
        .catch(error => {
          console.error(error);
          wx.hideLoading();
          wx.showToast({
            title: '加载失败，请刷新重试',
            icon: "none"
          })
        });
    });
    
    this.pull_messages();
  },

  /**
   * 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 () {
    this.pull_course();
    this.pull_students()
      .then(()=>{
        this.pull_presence().then(() => {
          if (this.my_presence == null) {
            this.my_presence = new Presence({
              edu_account_login: this.current_user.login,
              edu_course_id: this.course_id,
              present: true
            });
            this.my_presence.save();
          } else {
            this.my_presence.enter();
          }
        }).then(()=>{
        this.setData({loading: false});
      }).catch(error => {
          console.error(error);
          wx.showToast({
            title: '加载失败，请刷新重试',
            icon: "none"
          })
          });
    });
    this.pull_messages();
  },

  /**
   * 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");
  }
});