// export default {
var CommandBot = function() {
  var keyword = "robot";
  var commands = [];
  var noCommandRecognisedCallback = null;
  var languageRecognition = "en-US";

  //Keyword handling
  var rKeyword = new webkitSpeechRecognition();
  rKeyword.continuous = true;
  rKeyword.interimResults = true;

  var rCommand = new webkitSpeechRecognition();
  rCommand.continuous = false;
  rCommand.interimResults = true;

  //Speech synthesis
  var synth = window.speechSynthesis;
  var languageSynthesisDefault = "en-US";
  var languageSynthesis = "en-US";
  var voices = [];

  window.speechSynthesis.onvoiceschanged = function() {
    voices = synth.getVoices();
  };

  //Callback setup

  rKeyword.onresult = function(event) {
    for (var i = event.resultIndex; i < event.results.length; ++i) {
      var array = transcriptToArray(event.results[i][0].transcript);

      if (array.indexOf(keyword.toLowerCase()) != -1) {
        stopListeningKeyword();
        startListeningCommand();
      }

      document.getElementById("speech-result").innerHTML =
        "I heard: " + event.results[i][0].transcript;
    }
  };

  rCommand.onresult = function(event) {
    for (var i = event.resultIndex; i < event.results.length; ++i) {
      if (event.results[i].isFinal) {
        //Final results

        var commandFound = false;
        for (var j = 0; j < commands.length; j++) {
          commandFound =
            commandFound ||
            commands[j].tryCommand(event.results[i][0].transcript);
        }

        if (!commandFound && noCommandRecognisedCallback != null) {
          noCommandRecognisedCallback();
        }

        stopListeningCommand();
        startListeningKeyword();
      }
      document.getElementById("speech-result").textContent =
        "I heard: " + event.results[i][0].transcript;
    }
  };

  //Private functions

  this.startListeningKeyword = function() {
    document.getElementById("instructions").textContent =
      "Awaiting the keyword: " + keyword;
    rKeyword.start();
  };

  this.stopListeningKeyword = function() {
    rKeyword.abort();
  };

  this.startListeningCommand = function() {
    document.getElementById("instructions").textContent = "Listening...";
    document.getElementById("speech-result").classList.add("listening");
    rCommand.start();
  };

  this.stopListeningCommand = function() {
    document.getElementById("speech-result").classList.remove("listening");
    rCommand.abort();
  };

  var transcriptToArray = function(transcript) {
    return transcript.toLowerCase().split(" ");
  };

  //Public functions
  this.getLanguageRecognition = function() {
    return languageRecognition;
  };

  this.getLanguageSynthesis = function() {
    for (var i = 0; i < voices.length; i++) {
      if (voices[i].lang == languageSynthesis) {
        return languageSynthesis;
      }
    }
    return languageSynthesisDefault;
  };

  this.setLanguageRecognition = function(lang) {
    languageRecognition = lang;
    rKeyword.lang = languageRecognition;
    rCommand.lang = languageRecognition;
  };

  this.setLanguageSynthesis = function(lang) {
    languageSynthesis = lang;
  };

  this.setKeyword = function(kw) {
    keyword = kw;
  };

  this.getKeyword = function() {
    return keyword;
  };

  this.addCommand = function(command, callback) {
    commands.push(new Command(command, callback));
  };

  this.setNoCommandRecognised = function(callback) {
    noCommandRecognisedCallback = callback;
  };

  this.speak = function(sentence) {
    var utterance = new SpeechSynthesisUtterance(sentence);
    utterance.rate = 0.85;
    utterance.lang = this.getLanguageSynthesis();
    synth.speak(utterance);
  };

  this.run = function() {
    startListeningKeyword();
  };
};

var Command = function(t, cb) {
  var keys = t.toLowerCase().split(",");

  var callback = cb;

  this.tryCommand = function(transcript) {
    transcript = transcript.toLowerCase();
    if (this.testCommand(transcript)) {
      this.invoke(transcript, this.getParameter(transcript));
      return true;
    }
    return false;
  };

  this.testCommand = function(transcript) {
    //return speechArray.indexOf(command) != -1
    for (var i = 0; i < keys.length; i++) {
      if (transcript.indexOf(keys[i]) != -1) {
        return true;
      }
    }
    return false;
  };

  this.getParameter = function(transcript) {
    for (var i = 0; i < keys.length; i++) {
      var index = transcript.indexOf(keys[i]);
      if (index != -1) {
        return transcript.substr(index + keys[i].length + 1);
      }
    }
    return null;
  };

  this.invoke = function(transcript, parameter) {
    callback(transcript, parameter);
  };
};
// }