$(document).ready(function(){
  // Set variables used for API calls:
  var url1="https://wind-bow.gomix.me/twitch-api/streams/freecodecamp?callback=?";
  var twitchApiUrl = "https://api.twitch.tv/kraken"
  var clientID = "gdlz2qp4towqgesit6f8qxk2s89ap5";
  // Set starting list of streamers:
  var streamers = ['freecodecamp', 'bmkibler', 'Savjz', 'WowHobbs']
  // Initialize variables used in other functions:
  var followersListing = {};
  var channelName = "";
  var channelStatus = "";
  var channelLogo = "";
  
  // function called to create a row for each streamer displayed.
  // It first sets placeholder values for Logo and Status values and places two buttons.
  function createRow(streamer, following){
    $('#followerInfo').append("<div id = '" + streamer + "row' class = 'row channelRow'><div class='col-xs-2 logodiv'>Logo Goes Here</div><div class='col-xs-2 textCol'>" + streamer + "</div><div class='col-xs-2 statusColumn textCol'>Status Goes Here</div><div class='col-xs-2 textCol'>" + following + "</div><div class='col-xs-2 textCol'><button class='addFollowedChannels'>Add 5 Followed Channels</button><button class='hideChannel'>Hide Channel</button></div>");
  }
  
  //function called to update status information for each Streamer row.  It is called by the checkOnlineStatus function.
  function updateStreamerStatus(streamer, status, game, viewers){
    if(status==="offline"){
      $("#" + streamer + "row div:nth-child(3)").html("<a href='https://www.twitch.tv/"+streamer+"'rel='noopener noreferrer' target='_blank'>"+status+"</a>");
    } else {
      $("#" + streamer + "row div:nth-child(3)").html("<a href='https://www.twitch.tv/"+streamer+"'rel='noopener noreferrer' target='_blank'>"+status+"</a> <p>game:" +game+" </p><p>viewers: "+viewers+"</p>");
    }
  }
  
  // function called to add the streamer's logo to the Streamer row.  It is called by the getChannelInfo function.
  function addStreamerLogo(streamer, logo){
    $("#" + streamer + "row div:nth-child(1)").html("<img src='" + logo + "' class='logo'>");
  }
  
  // function called to add the streamer's display name to the Streamer row.  It is called by the getChannelInfo function.
  function addStreamerDisplayName(streamer, displayName){
    $("#" + streamer + "row div:nth-child(2)").html(displayName);
  }
  
  // function called to add an array of followers to the object that tracks followers needing to be added to the page.
  function addFollowersToListing(streamer, followers){
    followersListing[streamer] = followers;
  }
  
  // function that makes a call to the Twitch API to check a streamer's status.  If the streamer is online, the function collects information about the game played and the number of viewers.  It then uses this information to call the updateStreamerStatus function.  It is called by the addStreamerInfo function.
  function checkOnlineStatus(streamer){
    var checkOnlineUrl = twitchApiUrl + "/streams/" + streamer;
    var status = "";
    var game = "";
    var viewers = null;
    $.ajax({
      type:"GET",
      url:checkOnlineUrl,
      headers:{
      'Client-ID': clientID
      },
      success: function(streamData){
        console.log(streamData);
        if(streamData.stream===null){
          status = "offline";
        } else {
          status = "online";
          game = streamData.stream.game;
          viewers = streamData.stream.viewers;
        }
        updateStreamerStatus(streamer, status, game, viewers);
      }
    })
  }
  
  // function that gets logo and display_name information for each streamer.  It is called by the addStreamerInfo function.
  function getChannelInfo(streamer) {
    var channelInfoUrl = twitchApiUrl + "/channels/" + streamer;
    $.ajax({
      type:"GET",
      url:channelInfoUrl,
      headers:{
        'Client-ID': clientID
      },  
      success: function(channelData) {
        addStreamerLogo(streamer, channelData.logo);
        addStreamerDisplayName(streamer, channelData.display_name);
      }
    })
  }
  
  // master function that calls other functions for each streamer to be added - first createRow to create a row for the streamer; then checkOnlineStatus to collect additional information if the stremaer is online; then getChannelInfo to collect logo and display_name information.  It is called by the document.ready() function as well as by the addFiveFollowers function.
  function addStreamerInfo(streamer, followedBy){
    createRow(streamer, followedBy);
    checkOnlineStatus(streamer);
    getChannelInfo(streamer);
  }
  
  // function that adds streamer information for five of the followers in the array of followers associated with a particular streamer.  It is called by the getListOfFollowers function.
  function addFiveFollowers(streamer){
    for(var i=0; i<5; i++){
      addStreamerInfo(followersListing[streamer].pop(), streamer);
    }
  }
  
  // function that makes a call to the Twitch API to get the list of followers for a particular streamer.  If the call is successful, it checks to see if the list of followers has already been added to the followersListing object for that streamer.  If it has, then it calls addFiveFollowers for that streamer.  If it has not, then it adds all followers for that streamer to the followersListing object.  It is called by the Add 5 Followed Channels button.
  function getListOfFollowers(streamer){
    var getFollowersUrl = twitchApiUrl + "/users/" + streamer + "/follows/channels/";
    $.ajax({
      type:"GET",
      url:getFollowersUrl,
      headers:{
      'Client-ID': clientID
      },
      success: function(followersData){
        if(followersListing.hasOwnProperty(streamer)){
          console.log("We already have a list here");
          addFiveFollowers(streamer);
        } else {
          var followersList = [];
          for(var i=0;i<followersData.follows.length;i++){
            followersList.push(followersData.follows[i].channel.display_name);
          }
          addFollowersToListing(streamer, followersList);
          console.log(followersListing);
          addFiveFollowers(streamer);
        }        
      }
    })
  }
  
  // Initializes the page by calling addStreamerInfo for the starting list of streamers.
  for(var i = 0; i<streamers.length; i++){
    addStreamerInfo(streamers[i], "N/A");
  }
  
  $("body").on("click", ".addFollowedChannels", function(){
    var displayName = $(this).parent().prev().prev().prev().text();
    getListOfFollowers(displayName);
  });
  
    $('body').on("click", ".hideChannel", function(){
    $(this).parent().parent().hide();    
  });
});