class Message {
  constructor(user, txt, starNode, replyID) {
    this.replyID = replyID;
    this.user = user;
    this.txt = txt;
    this.starNode = starNode;
  }
  star() {
    this.starNode.click();
  }
  toMarkdown() {

  }

}

class Bot {
  constructor(name, owner, ignoreOwn, reqPing) {
    this.name = name;
    this.owner = owner;
    this.reqPing = reqPing;
    this.ignoreOwn = ignoreOwn;
    this.modules = new Set();
  }
  chat(msg) {
    document.getElementById('input').value = msg.replace(/<\/?i>/g, "*");
    document.getElementById("sayit-button").click();
  }

  getMessage(number) {
      var containers = document.getElementsByClassName("monologue");
      var container = containers[containers.length - number];
      var message = new Message(
        container.getElementsByClassName("username")[0].innerHTML,
        container.getElementsByClassName("content")[0].innerHTML,
        container.getElementsByClassName("stars")[0].children[0],
        ":" + container.getElementsByClassName("message")[0].id.split("-").pop()
      );
      return message;
    }

  loop() {
    while (this.run) {
      var message = this.getMessage(1);
      var prevMessage = this.getMessage(2);

      if (message.user == this.name && this.ignoreOwn) {
        return;
      }
      var messageL = message.txt.toLowerCase();

      if (this.reqPing && messageL.includes("@" +
          this.name.toLowerCase()) != true)
        return;
      if (message.txt == prevMessage.txt)
        return;
      for (let module of this.modules) module(this, message);
    }
  }

  stop() {
    this.run = false;
  }
  start() {
    this.run = true;
    this.loop();
  }
  addModule(callback) {
    this.modules.add(callback);
  }


}

function xkcd(bot, input) {

  if (input.txt.includes("xkcd")) {
    var split = input.txt.split(" ");
    var num = Number(split[split.indexOf("xkcd") + 1]);
    var url = "http://www.xkcd.com/" + num;
    if (url != "http://www.xkcd.com/NaN") {
      bot.chat(url);
    } else {
      bot.chat("Invalid input " + input.replyID); //thnx to downgoat on PPCG chat
    }
  }
}
var bot = new Bot("epicTCK", "epicTCK", false, true);
bot.addModule(xkcd);