/*! p5.speech.js v0.0.1 2015-06-12 */
/* updated v0.0.2 2017-10-17 */
/* updated v0.0.3 2022.1.7 */
/**
 * @module p5.speech
 * @submodule p5.speech
 * @for p5.speech
 * @main
 */
/**
 *  p5.speech
 *  R. Luke DuBois (dubois@nyu.edu)
 *  ABILITY Lab / Integrated Design & Media
 *  New York University
 *  The MIT License (MIT).
 *
 *  https://github.com/IDMNYU/p5.js-speech
 *
 *  Web Speech API: https://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
 *  Web Speech Recognition API: https://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
 */
(function (root, factory) {
  if (typeof define === 'function' && define.amd)
    define('p5.speech', ['p5'], function (p5) { (factory(p5));});
  else if (typeof exports === 'object')
    factory(require('../p5'));
  else
    factory(root['p5']);
}(this, function (p5) {
// =============================================================================
//                         p5.Speech
// =============================================================================


  /**
   * Base class for a Speech Synthesizer
   *
   * @class p5.Speech
   * @constructor
   */
  p5.Speech = function(_dv, _callback) {

    //
    // speech synthesizers consist of a single synthesis engine
    // per window instance, and a variable number of 'utterance'
    // objects, which can be cached and re-used for, e.g.
    // auditory UI.
    //
    // this implementation assumes a monolithic (one synth,
    // one phrase at a time) system.
    //

    // make a speech synthizer (this will load voices):
    this.synth = window.speechSynthesis;

    // make an utterance to use with this synthesizer:
    this.utterance = new SpeechSynthesisUtterance();

    this.isLoaded = 0; // do we have voices yet?

    // do we queue new utterances upon firing speak()
    // or interrupt what's speaking:
    this.interrupt = false;

    // callback properties to be filled in within the p5 sketch
    // if the author needs custom callbacks:
    this.onLoad; // fires when voices are loaded and synth is ready
    this.onStart; // fires when an utterance begins...
    this.onPause; // ...is paused...
    this.onResume; // ...resumes...
    this.onEnd; // ...and ends.

    this.voices = []; // array of available voices (dependent on browser/OS)

    // first parameter of constructor is an initial voice selector
    this.initvoice;
    if(_dv !== undefined) this.initvoice=_dv;
    if(_callback !== undefined) this.onLoad =_callback;

    var that = this; // aliasing 'this' into a fixed variable

    // onvoiceschanged() fires automatically when the synthesizer
    // is configured and has its voices loaded.  you don't need
    // to wait for this if you're okay with the default voice.
    //
    // we use this function to load the voice array and bind our
    // custom callback functions.
    window.speechSynthesis.onvoiceschanged = function() {
      if(that.isLoaded==0) { // run only once
        that.voices = window.speechSynthesis.getVoices();
        that.isLoaded = 1; // we're ready
        console.log("p5.Speech: voices loaded!");

        if(that.initvoice!=undefined) {
          that.setVoice(that.initvoice); // set a custom initial voice
          console.log("p5.Speech: initial voice: " + that.initvoice);
        }

        // fire custom onLoad() callback, if it exists:
        if(that.onLoad!=undefined) that.onLoad();

        //
        // bind other custom callbacks:
        //

        that.utterance.onstart = function(e) {
          //console.log("STARTED");
          if(that.onStart!=undefined) that.onStart(e);
        };
        that.utterance.onpause = function(e) {
          //console.log("PAUSED");
          if(that.onPause!=undefined) that.onPause(e);
        };
        that.utterance.onresume = function(e) {
          //console.log("RESUMED");
          if(that.onResume!=undefined) that.onResume(e);
        };
        that.utterance.onend = function(e) {
          //console.log("ENDED");
          if(that.onEnd!=undefined) that.onEnd(e);
        };
      }
    };

  };     // end p5.Speech constructor


  // listVoices() - dump voice names to javascript console:
  p5.Speech.prototype.listVoices = function() {
    if(this.isLoaded)
    {
      for(var i = 0;i<this.voices.length;i++)
      {
        console.log(this.voices[i].name);
      }
    }
    else
    {
    	console.log("p5.Speech: voices not loaded yet!")
    }
  };

  // setVoice() - assign voice to speech synthesizer, by name
  // (using voices found in the voices[] array), or by index.
  p5.Speech.prototype.setVoice = function(_v) {
    // type check so you can set by label or by index:
    if(typeof(_v)=='string') this.utterance.voice = this.voices.filter(function(v) { return v.name == _v; })[0];
    else if(typeof(_v)=='number') this.utterance.voice = this.voices[Math.min(Math.max(_v,0),this.voices.length-1)];
  };

  // volume of voice. API range 0.0-1.0.
  p5.Speech.prototype.setVolume = function(_v) {
    this.utterance.volume = Math.min(Math.max(_v, 0.0), 1.0);
  };

  // rate of voice.  not all voices support this feature.
  // API range 0.1-2.0.  voice will crash out of bounds.
  p5.Speech.prototype.setRate = function(_v) {
    this.utterance.rate = Math.min(Math.max(_v, 0.1), 2.0);
  };

  // pitch of voice.  not all voices support this feature.
  // API range >0.0-2.0.  voice will crash out of bounds.
  p5.Speech.prototype.setPitch = function(_v) {
    this.utterance.pitch = Math.min(Math.max(_v, 0.01), 2.0);
  };

  // sets the language of the voice.
  p5.Speech.prototype.setLang = function(_lang) {
    this.utterance.lang = _lang;
}

  // speak a phrase through the current synthesizer:
  p5.Speech.prototype.speak = function(_phrase) {
    if(this.interrupt) this.synth.cancel();
    this.utterance.text = _phrase;

    this.synth.speak(this.utterance);
  };

  // not working...
  p5.Speech.prototype.pause = function() {
    this.synth.pause();
  };

  // not working...
  p5.Speech.prototype.resume = function() {
    this.synth.resume();
  };

  // stop current utterance:
  p5.Speech.prototype.stop = function() {
    // not working...
    //this.synth.stop();
    this.synth.cancel();
  };

  // kill synthesizer completely, clearing any queued utterances:
  p5.Speech.prototype.cancel = function() {
    this.synth.cancel(); // KILL SYNTH
  };

  // Setting callbacks with functions instead
  p5.Speech.prototype.started = function(_cb) {
   this.onStart = _cb;
  }

  p5.Speech.prototype.ended = function(_cb) {
    this.onEnd = _cb;
  }

  p5.Speech.prototype.paused = function(_cb) {
    this.onPause = _cb;
  }

  p5.Speech.prototype.resumed = function(_cb) {
    this.onResume = _cb;
  }

// =============================================================================
//                         p5.SpeechRec
// =============================================================================


  /**
   * Base class for a Speech Recognizer
   *
   * @class p5.SpeechRec
   * @constructor
   */
  p5.SpeechRec = function(_lang, _callback) {

    //
    // speech recognition consists of a recognizer object per
    // window instance that returns a JSON object containing
    // recognition.  this JSON object grows when the synthesizer
    // is in 'continuous' mode, with new recognized phrases
    // appended into an internal array.
    //
    // this implementation returns the full JSON, but also a set
    // of simple, query-ready properties containing the most
    // recently recognized speech.
    //

    // make a recognizer object.
    if('webkitSpeechRecognition' in window) {
      this.rec = new (window.SpeechRecognition || window.webkitSpeechRecognition || window.mozSpeechRecognition || window.msSpeechRecognition)();
    }
    else {
      this.rec = new Object();
      console.log("p5.SpeechRec: Speech Recognition not supported in this browser.");
    }

    // first parameter is language model (defaults to empty=U.S. English)
    // no list of valid models in API, but it must use BCP-47.
    // here's some hints:
    // http://stackoverflow.com/questions/14257598/what-are-language-codes-for-voice-recognition-languages-in-chromes-implementati
    if(_lang !== undefined) this.rec.lang=_lang;

    // callback properties to be filled in within the p5 sketch
    // if the author needs custom callbacks:
    this.onResult; // fires when something has been recognized
    this.onStart; // fires when the recognition system is started...
    this.onError; // ...has a problem (e.g. the mic is shut off)...
    this.onEnd; // ...and ends (in non-continuous mode).
    if(_callback !== undefined) this.onResult=_callback;

    // recognizer properties:

    // continous mode means the object keeps recognizing speech,
    // appending new tokens to the internal JSON.
    this.continuous = false;
    // interimResults means the object will report (i.e. fire its
    // onresult() callback) more frequently, rather than at pauses
    // in microphone input.  this gets you quicker, but less accurate,
    // results.
    this.interimResults = false;

    // result data:

    // resultJSON:
    // this is a full JSON returned by onresult().  it consists of a
    // SpeechRecognitionEvent object, which contains a (wait for it)
    // SpeechRecognitionResultList.  this is an array.  in continuous
    // mode, it will be appended to, not cleared.  each element is a
    // SpeechRecognition result, which contains a (groan)
    // SpeechRecognitionAlternative, containing a 'transcript' property.
    // the 'transcript' is the recognized phrase.  have fun.
    this.resultJSON;
    // resultValue:
    // validation flag which indicates whether the recognizer succeeded.
    // this is *not* a metric of speech clarity, but rather whether the
    // speech recognition system successfully connected to and received
    // a response from the server.  you can construct an if() around this
    // if you're feeling worried.
    this.resultValue;
    // resultString:
    // the 'transcript' of the most recently recognized speech as a simple
    // string.  this will be blown out and replaced at every firing of the
    // onresult() callback.
    this.resultString;
    // resultConfidence:
    // the 'confidence' (0-1) of the most recently recognized speech, e.g.
    // that it reflects what was actually spoken.  you can use this to filter
    // out potentially bogus recognition tokens.
    this.resultConfidence;

    var that = this; // aliasing 'this' into a fixed variable

    // onresult() fires automatically when the recognition engine
    // detects speech, or times out trying.
    //
    // it fills up a JSON array internal to the webkitSpeechRecognition
    // object.  we reference it over in our struct here, and also copy
    // out the most recently detected phrase and confidence value.
    this.rec.onresult = function(e) {
      that.resultJSON = e; // full JSON of callback event
      that.resultValue = e.returnValue; // was successful?
      // store latest result in top-level object struct
      that.resultString = e.results[e.results.length-1][0].transcript.trim();
      that.resultConfidence = e.results[e.results.length-1][0].confidence;
      if(that.onResult!=undefined) that.onResult();
    };

    // fires when the recognition system starts (i.e. when you 'allow'
    // the mic to be used in the browser).
    this.rec.onstart = function(e) {
      if(that.onStart!=undefined) that.onStart(e);
    };
    // fires on a client-side error (server-side errors are expressed
    // by the resultValue in the JSON coming back as 'false').
    this.rec.onerror = function(e) {
      if(that.onError!=undefined) that.onError(e);
    };
    // fires when the recognition finishes, in non-continuous mode.
    this.rec.onend = function() {
      if(that.onEnd!=undefined) that.onEnd();
    };

  }; // end p5.SpeechRec constructor

  // start the speech recognition engine.  this will prompt a
  // security dialog in the browser asking for permission to
  // use the microphone.  this permission will persist throughout
  // this one 'start' cycle.  if you need to recognize speech more
  // than once, use continuous mode rather than firing start()
  // multiple times in a single script.
  p5.SpeechRec.prototype.start = function(_continuous, _interim) {
    if('webkitSpeechRecognition' in window) {
      if(_continuous !== undefined) this.continuous = _continuous;
      if(_interim !== undefined) this.interimResults = _interim;
      this.rec.continuous = this.continuous;
      this.rec.interimResults = this.interimResults;
      this.rec.start();
    }
  };

  // Add function to stop the speech recognition from continued listening
  p5.SpeechRec.prototype.stop = function()  {
    if('webkitSpeechRecognition' in window) {
      this.rec.stop();
    }
  };

}));

/*
todo:
* fix callbacks (pause, resume) in synthesizer.
* support speech grammar models for scoped auditory UI.
* support markdown, boundaries, etc for better synthesis tracking.
* support utterance parser for long phrases.
*/

// EOF