Google App Script Code

var messageArray  = []

function chartToImage()
{
  var slides        = SlidesApp.create("temp");
  var slideDeleted  = false;

  var startTime     = new Date().getTime();
  var today         = new Date();
  var todayString   = today.getDate() + "-" + today.getMonth()

  var creationDate  = new Date('August 15, 2016 GMT+10:00');
  var creationString= creationDate.getDate() + "-" + creationDate.getMonth()

  var anniversary   = ""

  Logger.log(Duration(startTime)[0] + "Today's date is " + (today.getDate() + "-" + today.getMonth()))
  Logger.log(Duration(startTime)[0] + "Creation date is " + (creationDate.getDate() + "-" + creationDate.getMonth()))

  if(todayString == creationString || todayString == "31-11")
  {
    if(todayString == "31-12")
    {
      Logger.log(Duration(startTime)[0] + "It's A New Year!")
      var anniversary = "\n***HAPPY NEW YEARS!***"
    }
    else if(todayString == creationString)
    {
      var year        = getNumberWithOrdinal(Math.floor(((today / 86400000) - (creationDate / 86400000)) / 365))
      Logger.log(Duration(startTime)[0] + "It's our " + year + " anniversary!")
      var anniversary = "\n***HAPPY " + year + " ANNIVERSARY!***"
    }
  }

  var properties    = PropertiesService.getScriptProperties()
  var discordUrl    = "REMOVED";
  var urlQueries    = "?thread_id=905517563616849950&wait=true";

  var files         = DriveApp.getFolderById("1GDylzA3ibQVRHuqx7VpLs_BY1UVlD9_v").getFiles()
  var spreadsheets  = []
  var images        = []

  try
  {
    while(files.hasNext())
    {
      var file      = files.next()
      Logger.log(Duration(startTime)[0] + "Fetching File ID")
      var fileID    = file.getId()
      Logger.log(Duration(startTime)[0] + "File ID Fetched")

      Logger.log(Duration(startTime)[0] + "Opening " + file.getName())
      spreadsheets.push(SpreadsheetApp.openById(fileID))
      Logger.log(Duration(startTime)[0] + file.getName() + " Opened")
      if (Duration(startTime)[1] >= 120)
      {
        throw("Opening spreadsheet has taken too long! Restarting")
      }
    }

    spreadsheets.sort((a, b) => a.getId() > b.getId() && 1 || -1)
    Logger.log(Duration(startTime)[0] + "Spreadsheets Sorted")

    for (var i = 0; i < spreadsheets.length;)
    {
      Logger.log(Duration(startTime)[0] + "Grabbing Charts From " + spreadsheets[i].getName())
      var charts      = spreadsheets[i].getSheets()[0].getCharts()
      Logger.log(Duration(startTime)[0] + spreadsheets[i].getName() +": Charts Fetched")
      charts.sort((a, b) => a.getContainerInfo().getAnchorRow() > b.getContainerInfo().getAnchorRow() && 1 || -1)
      Logger.log(Duration(startTime)[0] + spreadsheets[i].getName() +": Sorted Charts")

      for (var j = 0; j < charts.length;)
      {
        charts.push(slides.getSlides()[0].insertSheetsChartAsImage(charts.shift()).getAs("image/png"))
        Logger.log(Duration(startTime)[0] + spreadsheets[i].getName() + ": Chart Pushed, " + (charts.length - j) + " Remaining")
        j++
      }

      images.push(charts)
      i++
    }
    DriveApp.getFileById(slides.getId()).setTrashed(true);
    var slideDeleted  = true;
    Logger.log(Duration(startTime)[0] + "Chart Cache Deleted")

    if(properties.getProperty("messageIDArray") != null)
    {
      Logger.log(Duration(startTime)[0] + "Deleting Messages")
      deleteMessages(JSON.parse(properties.getProperty("messageIDArray")), discordUrl, "?wait=true&thread_id=905517563616849950")
      Logger.log(Duration(startTime)[0] + "Messages Deleted")
    }

    sendMessage("***__Server Statistics, <t:" + Math.floor((new Date().getTime()/1000)).toString() + ":F>__***" + anniversary, discordUrl, urlQueries, false, false)
    Logger.log(Duration(startTime)[0] + "Starting Message Sent")
    for (var i = 0; i < spreadsheets.length;)
    {
      var messageId   = sendMessage("***" + spreadsheets[i].getName() + "***", discordUrl, urlQueries, images[i], false, startTime)
      i++
    }
    var endMessage    = "You can view the server data here: https://drive.google.com/drive/folders/19n_9hC4Odc-q4aoSIB4IbwivSviMVaDt \nGive me some feedback here!: https://forms.gle/WzuYpaJ22VRSvJY38 \nCreated by <@221459835315683330>"
    sendMessage(endMessage, discordUrl, urlQueries, false, false)

    Logger.log(Duration(startTime)[0] + "All Messages Sent")
    properties.setProperty("messageIDArray", JSON.stringify(messageArray))
    //ScriptApp.newTrigger("channelChartToImage").timeBased().at(new Date(new Date().getTime() + 60000)).create()
  }
  catch(error)
  {
    Logger.log(Duration(startTime)[0] + "This Script Will Restart Due To An Error In A Minute")
    Logger.log(Duration(startTime)[0] + "Error: " + error)
    ScriptApp.newTrigger("chartToImage").timeBased().at(new Date(new Date().getTime() + 60000)).create()
    if(!slideDeleted)
    {
      DriveApp.getFileById(slides.getId()).setTrashed(true);
    }
  }
}

function sendMessage(message, webhookURL, queries, images, thread_name, startTime)
{
  var payload                   = {}
  var params                    = {}

  if(thread_name)
  {
    payload.thread_name      = thread_name;
  }

  if(images)
  {
    var attachmentsLimit        = 10;
    var iterationsNeeded        = Math.floor((images.length - 1) / attachmentsLimit) + 1

    Logger.log(Duration(startTime)[0] + "Image Exists")
    Logger.log(Duration(startTime)[0] + "Starting length is: " + images.length)
    for (var p = 0; p < iterationsNeeded;)
    {
      var payload               = {}
      var params                = {}

      Logger.log(Duration(startTime)[0] + "Iteration" + (p + 1))
      if(message && p < 1)
      {
        Logger.log(Duration(startTime)[0] + "Message Exists and P < 1")
        payload.content         = message;
      }
      for (var k = 0 + (p * 10); k < Math.min(images.length, attachmentsLimit * (p + 1));)
      {
        images[k].setName("Chart" + k + ".png")

        payload[k - (p * 10)]   = images[k]
        k++
        Logger.log(Duration(startTime)[0] + "Image length remaining is: " + (images.length - k))
        Logger.log(Duration(startTime)[0] + payload)
      }
      if(thread_name)
      {
        payload.thread_name      = thread_name;
      }
      params.payload            = payload;
      params.muteHttpExceptions = true;
      params.method             = "POST";
      Logger.log(Duration(startTime)[0]+ params)
      while(true)
      {
        var response            = UrlFetchApp.fetch(webhookURL + queries, params);
        var responseCode        = response.getResponseCode()
        if(responseCode == 429 || responseCode == 429.0)
        {
          var seconds           = Math.ceil((JSON.parse(response.getContentText()).retry_after) * 1000) / 1000
          Logger.log(Duration(startTime)[0] + "Got throttled on sending message, waiting " + seconds + " seconds")
          Utilities.sleep(seconds * 1000)
        }
        else
        {
          break;
        }
      }
      Logger.log(Duration(startTime)[0] + "Message Sent")
      messageArray.push(JSON.parse(response.getContentText()).id)
      p++
    }
  }
  else
  {
    payload.content             = message;
    params.payload              = payload;

    params.muteHttpExceptions   = true;
    params.method               = "POST";

    var response = UrlFetchApp.fetch(webhookURL + queries, params).getContentText();
    messageArray.push(JSON.parse(response).id)
  }
  return JSON.parse(response).id;
}