//The function create the file with the transcription of the audio
function writeTranscription(text)
{
    var textFile = null;
    var data = new Blob([text], {type: 'text/plain'});

    if(textFile !== null)
    {
        window.URL.revokeObjectURL(textFile);
    }

    textFile = window.URL.createObjectURL(data);

    return textFile;
}

var ASR = new webkitSpeechRecognition();
var transcription = "";

var recognizing = false;
var autoRestart = false;
var lastStartedAt = 0;

ASR.lang='it-IT';
ASR.continuous = false;
ASR.maxAlternatives=5;

var media = new Audio("audio_files/ballaro_parte2.mp3");
media.addEventListener('ended', function()
    {
        autoRestart = false;
        ASR.stop();
    }, true);
var isPlaying = false;

function onStartASR(event)
{
    ASR.start();
    console.log('onStartASR Pressed to start recognition');
}

function onEndASR(event)
{
    autoRestart = false;
    ASR.stop();
}

ASR.onstart = function()
{
    console.log('onstart'); //debug
    lastStartedAt = new Date().getTime();
    autoRestart = true;
    recognizing = true;
    setTimeout(function() {media.play();}, 500);
};

ASR.onend = function()
{
    console.log('onend'); //debug
    media.pause();
    recognizing = false;
    if(autoRestart)
    {
        setTimeout(function() {ASR.start();}, 1000);

        // var timeSinceLastStart = new Date().getTime() - lastStartedAt;
        // if(timeSinceLastStart < 1000)
        // {
        //  setTimeout(function() {ASR.start();}, 1000 - timeSinceLastStart);
        // }
        // else
        // {
        //  recognizing = false;
        //  ASR.start();
        // }
    } else
    {
        if(transcription)
        {
            var link = document.getElementById('link');
            link.href = writeTranscription(transcription);
            link.style.display = 'block';
        }
    }
};

ASR.onresult = function(event)
{
    console.log('onresult'); //debug
    console.log(event);
    confidence = event.results[0][0].confidence;
    transcript = event.results[0][0].transcript;
    console.log('trans:' + transcript + ' conf:' + confidence);
    if(event.results[0].isFinal)
    {
        $("#ASRDiv").html(transcript);
        transcription += transcript + " ";
    }
};

ASR.onerror = function(event)
{
    console.log('onerror: ' + event.error); //debug
    switch(event.error)
    {
        case 'network':
            recognizing = true;
            break;
        case 'not allowed':
        case 'service-not-allowed':
            autoRestart = false;
            recognizing = false;
            break;
        case 'no-speech':
            recognition = true;
            break;
        case 'language-not-supported':
            window.alert('Language not supported!');
            autoRestart = false;
            recognizing = false;
            break;
        case 'bad-grammar':
            window.alert('Bad grammar!');
            autoRestart = false;
            recognizing = false;
            break;
    }
};