const app = getApp()

Page({
  allnavData: [
    {
      text: "全部",
      exercise_status: "all",
      course_identities: [2, 5, 6]
    },
    {
      text: "未发布",
      exercise_status: 1,
      course_identities: [2]
    },
    {
      text: '提交中',
      exercise_status: 2,
      course_identities: [2, 5, 6]
    },
    {
      text: '已截止',
      exercise_status: 3,
      course_identities: [2, 5, 6]
    },
  ],
  data: {
    loading: true,
    require_login: false,
    page_status: 0,  // 0=>loading 1=>success 2=>fail
    exercises: [],
    navData: [
      {
        text: "全部",
        exercise_status: "all",
        course_identities: [2, 5, 6]
      },
      {
        text: '提交中',
        exercise_status: 2,
        course_identities: [2, 5, 6]
      },
      {
        text: '已截止',
        exercise_status: 3,
        course_identities: [2, 5, 6]
      },
      {
        text: "未发布",
        exercise_status: 1,
        course_identities: [2]
      },
    ],
    currentTab: 0,
    navScrollLeft: 0
  },
  exercise_result: function ({ currentTarget: { dataset } }){
    wx.navigateTo({
      url: `../exercise_result/exercise_result?exercise_id=${dataset.exercise_id}`,
    })
  },
  see_grade: function({currentTarget:{dataset}}){
    wx.navigateTo({
      url: `../exercise_grade/exercise_grade?exercise_id=${dataset.exercise_id}`,
    })
  },
  edit_exercise: function({currentTarget:{dataset}}){
    wx.navigateTo({
      url: `../exercise_setting/exercise_setting?course_id=${this.course_id}&exercise_id=${dataset.exercise_id}`,
    })
  },
  create_exercise: function(){
    wx.navigateTo({
      url: `../exercise_setting/exercise_setting?course_id=${this.course_id}`,
    })
  },
  pull_exercise: function(){
    app.api("courses.exercises")({ course_id: this.course_id })
    .then(res => {
      console.log("pull_exercise");
      console.log(res); 
      if(res.exercises){
        this.setData({exercises: res.exercises, loading: false});
      }else if(res.status==401){
        this.setData({require_login: true});
        wx.showToast({
            title: '请登陆后重试',
            icon: "none"
          });
      }
      console.log(this.data)
    })
    .catch(e=>{
      console.error(e);
      app.showError(e)
    });
  },
  see_exercise: function ({ currentTarget: { dataset } }){
    wx.navigateTo({
      url: '../exercise/exercise?exercise_id=' + dataset.exercise_id,
    });
  },
  enter_exercise: function({currentTarget:{dataset}}){
    wx.showModal({
      title: '确认',
      content: '开始作答吗？',
      success: res=>{
        if(res.confirm){
          wx.navigateTo({
            url: '../exercise/exercise?exercise_id='+dataset.exercise_id,
          });
        }
      }
    });
  },
  //事件处理函数
  onLoad: function (options) {
    this.course_id = options.id;
    app.api("courses.top_banner")({course_id: this.course_id})
    .then(res=>{
      this.setData({course:res})
      console.log(res)
    })
  },
  onShow: function(){
    this.setData({require_login: false});
    this.pull_exercise();
  },
  switchNav(event) {
    var cur = event.currentTarget.dataset.current;
    //每个tab选项宽度占1/5
    var singleNavWidth = this.data.windowWidth / 3;
    //tab选项居中                            
    this.setData({
      navScrollLeft: (cur - 1) * singleNavWidth
    })
    if (this.data.currentTab == cur) {
      return false;
    } else {
      this.setData({
        currentTab: cur
      })
    }
  },
  switchTab(event) {
    var cur = event.detail.current;
    var singleNavWidth = this.data.windowWidth / 5;
    this.setData({
      currentTab: cur,
      navScrollLeft: (cur - 1) * singleNavWidth
    });
  },
  onPullDownRefresh: function(){
    this.pull_exercise();
  },
  onShareAppMessage:function(){

  }
})