var elem; // current audio element playing
var currIndex; // current index
var len; // current length of audio files for tour
var buttonCount; // number of audio tour buttons
var aname; // the audio file name
var ahash; // hash of the audio file name to the lines to highlight
var theDivid; // div id 
var afile; // file name for audio
var playing = false; // flag to say if playing or not
var tourName;

String.prototype.replaceAll = function (target, replacement) {
    return this.split(target).join(replacement);
};

// function to display the audio tours
var createAudioTourHTML = function (divid, code, bnum, audio_text) {

    // Replacing has been done here to make sure special characters in the code are displayed correctly
    code = code.replaceAll("*doubleq*", "\"");
    code = code.replaceAll("*singleq*", "'");
    code = code.replaceAll("*open*", "(");
    code = code.replaceAll("*close*", ")");
    code = code.replaceAll("*nline*", "<br/>");
    var codeArray = code.split("<br/>");

    var audio_hash = new Array();
    var bval = new Array();
    var atype = audio_text.replaceAll("*doubleq*", "\"");
    var audio_type = atype.split("*atype*");
    for (var i = 0; i < audio_type.length - 1; i++) {
        audio_hash[i] = audio_type[i];
        var aword = audio_type[i].split(";");
        bval.push(aword[0]);
    }

    var first = "<pre><div id='" + divid + "_l1'>" + "1.  " + codeArray[0] + "</div>";
    num_lines = codeArray.length;
    for (var i = 1; i < num_lines; i++) {
        var sec = "<div id='" + divid + "_l" + (i + 1) + "'>" + (i + 1) + ".  " + codeArray[i] + "</div>";
        var next = first.concat(sec);
        first = next;
    }
    first = first + "</pre>"

    //laying out the HTML content

    var bcount = 0;
    var html_string = "<div class='modal-lightsout'></div><div class='modal-profile'><h3>Take an audio tour!</h3><div class='modal-close-profile'></div><p id='windowcode'></p><p id='" + divid + "_audiocode'></p>";
    html_string += "<p id='status'></p>";
    html_string += "<input type='image' src='../_static/first.png' width='25' id='first_audio' name='first_audio' title='Play first audio in tour' alt='Play first audio in tour' disabled/>" + "<input type='image' src='../_static/prev.png' width='25' id='prev_audio' name='prev_audio' title='Play previous audio in tour' alt='Play previous audio in tour' disabled/>" + "<input type='image' src='../_static/pause.png' width='25' id='pause_audio' name='pause_audio' title='Pause current audio' alt='Pause current audio' disabled/><input type='image' src='../_static/next.png' width ='25' id='next_audio' name='next_audio' title='Play next audio in tour' alt='Play next audio in tour' disabled/><input type='image' src='../_static/last.png' width ='25' id='last_audio' name='last_audio' title='Play last audio in tour' alt='Play last audio in tour' disabled/><br/>";
    for (var i = 0; i < audio_type.length - 1; i++) {
        html_string += "<input type='button' style='margin-right:5px;' class='btn btn-default btn-sm' id='button_audio_" + i + "' name='button_audio_" + i + "' value=" + bval[i] + " />";
        bcount++;
    }
    //html_string += "<p id='hightest'></p><p id='hightest1'></p><br/><br/><p id='test'></p><br/><p id='audi'></p></div>";
    html_string += "</div>";

    $('#cont').html(html_string);
    $('#windowcode').html(first);

    // Position modal box in the center of the page
    $.fn.center = function () {
        this.css("position", "absolute");
        // y position
        this.css("top", ($(window).scrollTop() + $(navbar).height() + 10 + "px"));
        // show window on the left so that you can see the output from the code still
        this.css("left", ($(window).scrollLeft() + "px"));
        return this;
    }

    $(".modal-profile").center();
    $('.modal-profile').fadeIn("slow");
    //$('.modal-lightsout').css("height", $(document).height());
    $('.modal-lightsout').fadeTo("slow", .5);
    $('.modal-close-profile').show();

    // closes modal box once close link is clicked, or if the lights out divis clicked
    $('.modal-close-profile, .modal-lightsout').click(function () {
        if (playing) {
            elem.pause();
        }
        //log change to db
        logBookEvent({'event': 'Audio', 'change': 'closeWindow', 'div_id': divid});
        $('.modal-profile').fadeOut("slow");
        $('.modal-lightsout').fadeOut("slow");
    });

    // Accommodate buttons for a maximum of five tours 

    $('#' + 'button_audio_0').click(function () {
        tour(divid, audio_hash[0], bcount);
    });
    $('#' + 'button_audio_1').click(function () {
        tour(divid, audio_hash[1], bcount);
    });
    $('#' + 'button_audio_2').click(function () {
        tour(divid, audio_hash[2], bcount);
    });
    $('#' + 'button_audio_3').click(function () {
        tour(divid, audio_hash[3], bcount);
    });
    $('#' + 'button_audio_4').click(function () {
        tour(divid, audio_hash[4], bcount);
    });

    // handle the click to go to the next audio
    $('#first_audio').click(function () {
        firstAudio();
    });

    // handle the click to go to the next audio
    $('#prev_audio').click(function () {
        prevAudio();
    });

    // handle the click to pause or play the audio
    $('#pause_audio').click(function () {
        pauseAndPlayAudio();
    });

    // handle the click to go to the next audio
    $('#next_audio').click(function () {
        nextAudio();
    });

    // handle the click to go to the next audio
    $('#last_audio').click(function () {
        lastAudio();
    });

    // make the image buttons look disabled
    $("#first_audio").css('opacity', 0.25);
    $("#prev_audio").css('opacity', 0.25);
    $("#pause_audio").css('opacity', 0.25);
    $("#next_audio").css('opacity', 0.25);
    $("#last_audio").css('opacity', 0.25);

};

var tour = function (divid, audio_type, bcount) {
    // set globals
    buttonCount = bcount;
    theDivid = divid;

    // enable prev, pause/play and next buttons and make visible
    $('#first_audio').removeAttr('disabled');
    $('#prev_audio').removeAttr('disabled');
    $('#pause_audio').removeAttr('disabled');
    $('#next_audio').removeAttr('disabled');
    $('#last_audio').removeAttr('disabled');
    $("#first_audio").css('opacity', 1.0);
    $("#prev_audio").css('opacity', 1.0);
    $("#pause_audio").css('opacity', 1.0);
    $("#next_audio").css('opacity', 1.0);
    $("#last_audio").css('opacity', 1.0);

    // disable tour buttons
    for (var i = 0; i < bcount; i++)
        $('#button_audio_' + i).attr('disabled', 'disabled');

    var atype = audio_type.split(";");
    var name = atype[0].replaceAll("\"", " ");
    tourName = name;
    $('#status').html("Starting the " + name);

    //log tour type to db
    logBookEvent({'event': 'Audio', 'tour type': name, 'div_id': divid});

    var max = atype.length;
    var str = "";
    ahash = new Array();
    aname = new Array();
    for (i = 1; i < max - 1; i++) {
        var temp = atype[i].split(":");
        var temp_line = temp[0];
        var temp_aname = temp[1];

        var akey = temp_aname.substring(1, temp_aname.length);
        var lnums = temp_line.substring(1, temp_line.length);

        //alert("akey:"+akey+"lnum:"+lnums);

        // str+="<audio id="+akey+" preload='auto'><source src='http://ice-web.cc.gatech.edu/ce21/audio/"+
        // akey+".mp3' type='audio/mpeg'><source src='http://ice-web.cc.gatech.edu/ce21/audio/"+akey+
        // ".ogg' type='audio/ogg'>Your browser does not support the audio tag</audio>";
        str += "<audio id=" + akey + " preload='auto' ><source src='../_static/audio/" + akey +
            ".wav' type='audio/wav'><source src='../_static/audio/" +
            akey + ".mp3' type='audio/mpeg'><br />Your browser does not support the audio tag</audio>";
        ahash[akey] = lnums;
        aname.push(akey);
    }
    var ahtml = "#" + divid + "_audiocode";
    $(ahtml).html(str); // set the html to the audio tags
    len = aname.length; // set the number of audio file in the tour

    // start at the first audio
    currIndex = 0;

    // play the first audio in the tour
    playCurrIndexAudio();
};

function handlePlaying() {

    // if playing audio pause it 
    if (playing) {
    
        elem.pause();
        
        // unbind current ended
        $('#' + afile).unbind('ended');
    
        // unhighlight the prev lines
        unhighlightLines(theDivid, ahash[aname[currIndex]]);
    }

}

var firstAudio = function () {

    // if audio is playing handle it
    handlePlaying();

    //log change to db
    logBookEvent({'event': 'Audio', 'change': 'first', 'div_id': theDivid});


    // move to the first audio
    currIndex = 0;

    // start at the first audio
    playCurrIndexAudio();

};

var prevAudio = function () {

   // if there is a previous audio
   if (currIndex > 0)
    {

       // if audio is playing handle it
       handlePlaying();

       //log change to db
       logBookEvent({'event': 'Audio', 'change': 'prev', 'div_id': theDivid});

    

       // move to previous to the current (but the current index has moved to the next)
       currIndex = currIndex - 1;

       // start at the prev audio
       playCurrIndexAudio();
    }

};

var nextAudio = function () {

    // if audio is playing handle it
    handlePlaying();

    //log change to db
    logBookEvent({'event': 'Audio', 'change': 'next', 'div_id': theDivid});

    // if not at the end
    if (currIndex < (len - 1))
    {
      // start at the next audio
      currIndex = currIndex + 1;
      playCurrIndexAudio();
    }
    else if (currIndex == (len - 1))
    {
       handleTourEnd();
    }
};

var lastAudio = function () {

    // if audio is playing handle it
    handlePlaying();

    //log change to db
    logBookEvent({'event': 'Audio', 'change': 'last', 'div_id': theDivid});

    // move to the last audio
    currIndex = len - 1;

    // start at last
    playCurrIndexAudio();

};

// play the audio at the current index
var playCurrIndexAudio = function () {

    // set playing to false
    playing = false; 

    // play the current audio and highlight the lines
    playaudio(currIndex, aname, theDivid, ahash);
    
};

// handle the end of the tour
var handleTourEnd = function() {

   $('#status').html(" The " + tourName + " Ended");

        // disable the prev, pause/play, and next buttons and make them more invisible
        $('#first_audio').attr('disabled', 'disabled');
        $('#prev_audio').attr('disabled', 'disabled');
        $('#pause_audio').attr('disabled', 'disabled');
        $('#next_audio').attr('disabled', 'disabled');
        $('#last_audio').attr('disabled', 'disabled');
        $("#first_audio").css('opacity', 0.25);
        $("#prev_audio").css('opacity', 0.25);
        $("#pause_audio").css('opacity', 0.25);
        $("#next_audio").css('opacity', 0.25);
        $("#last_audio").css('opacity', 0.25);

        // enable the tour buttons
        for (var j = 0; j < buttonCount; j++)
            $('#button_audio_' + j).removeAttr('disabled');
}

// only call this one after the first time
var outerAudio = function () {
    
    // unbind ended
    $('#' + afile).unbind('ended');

    // set playing to false
    playing = false;

    // unhighlight previous lines from the last audio
    unhighlightLines(theDivid, ahash[aname[currIndex]]);

    // increment the currIndex to point to the next one
    currIndex++; 

    // if the end of the tour reset the buttons
    if (currIndex == len) {
       handleTourEnd();
    }
    
    // else not done yet so play the next audio
    else {
    
        // play the audio at the current index
        playCurrIndexAudio();
    }
};

// play the audio now that it is ready
var playWhenReady = function(afile,divid,ahash) { 
        // unbind current
        $('#' + afile).unbind('canplaythrough');
        //console.log("in playWhenReady " + elem.duration);
   
        $('#status').html("Playing the " + tourName);
        elem.currentTime = 0;
        highlightLines(divid, ahash[afile]);
        $('#' + afile).bind('ended',function() {
            outerAudio();
        });
        playing = true;
        elem.play();

}; 


// play the audio at the specified index i and set the duration and highlight the lines
var playaudio = function (i, aname, divid, ahash) {
    afile = aname[i];
    elem = document.getElementById(afile);

    // if this isn't ready to play yet - no duration yet then wait
    //console.log("in playaudio " + elem.duration);
    if (isNaN(elem.duration) || elem.duration == 0)
    {
       // set the status
       $('#status').html("Loading audio.  Please wait.");
       $('#' + afile).bind('canplaythrough',function() {
         playWhenReady(afile,divid,ahash);
       });
    }
    // otherwise it is ready so play it
    else 
        playWhenReady(afile,divid,ahash);
};

// pause if playing and play if paused
var pauseAndPlayAudio = function () {
    var btn = document.getElementById('pause_audio');

    // if paused and clicked then continue from current
    if (elem.paused) {
        // calcualte the time left to play in milliseconds
        counter = (elem.duration - elem.currentTime) * 1000;
        elem.play(); // start the audio from current spot
        document.getElementById("pause_audio").src = "../_static/pause.png";
        document.getElementById("pause_audio").title = "Pause current audio";
        //log change to db
        logBookEvent({'event': 'Audio', 'change': 'play', 'div_id': theDivid});
    }

    // if audio was playing pause it
    else if (playing) {
        elem.pause(); // pause the audio
        document.getElementById("pause_audio").src = "../_static/play.png";
        document.getElementById("pause_audio").title = "Play paused audio";
        //log change to db
        logBookEvent({'event': 'Audio', 'change': 'pause', 'div_id': theDivid});
    }

};

// process the lines
var processLines = function (divid, lnum, color) {
    var comma = lnum.split(",");

    if (comma.length > 1) {
        for (i = 0; i < comma.length; i++) {
            setBackroundForLines(divid, comma[i], color);
        }
    }
    else {
        setBackroundForLines(divid, lnum, color);
    }
};

// unhighlight the lines - set the background back to transparent
var unhighlightLines = function (divid, lnum) {
    processLines(divid, lnum, 'transparent');
};

// highlight the lines - set the background to a yellow color
var highlightLines = function (divid, lnum) {
    processLines(divid, lnum, '#ffff99');
};

// set the background to the passed color
var setBackroundForLines = function (divid, lnum, color) {
    var hyphen = lnum.split("-");

    // if a range of lines
    if (hyphen.length > 1) {
        var start = parseInt(hyphen[0]);
        var end = parseInt(hyphen[1]) + 1;
        for (var k = start; k < end; k++) {
            //alert(k);
            var str = "#" + divid + "_l" + k;
            if ($(str).text() != "")
                $(str).css('background-color', color);
            //$(str).effect("highlight",{},(dur*1000)+4500);
        }
    }
    else {
        //alert(lnum);
        var str = "#" + divid + "_l" + lnum;
        $(str).css('background-color', color);
        //$(str).effect("highlight",{},(dur*1000)+4500);
    }
};