/////////////////////// BlueAudio 1.0.4 \\\\\\\\\\\\\\\\\\\\\\\\\\
// This requires BlueCore in order to run and assumes it is     \\
// already loaded. It will not work without BlueCore loaded     \\
// first.                                                       \\
//////////////////////////////////\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

function getFrequency (note, octave) {
	// octaves double value
	// half steps are calculated using fn = f0*(2^(1/12))^n
	var base = 16.35; // bottom c
	var a = Math.pow(2,1/12); // Defining a
	// Check our inputs for sanity
	if ("number" != typeof note) { note = 1; }
	if ("number" != typeof octave) { octave = 4; }
	if (note < 0) { note = 0;}
	if (note > 11) { note = 11; }
	if (octave < 0) { octave = 0; }
	if (octave > 8) { octave = 8; }
	return (base*Math.pow(a,note))*Math.pow(2,octave);
}

function parseNote (string) {
	if ("string" != typeof string) { string = "4c1/4"; }
	var noteReg = new RegExp(/^([1-8])([a-g][nb#]?)(\d)\/(\d{1,2})/i);
	var noteArray = string.match(noteReg);
	if (noteArray) { if (noteArray.length == 5) {
	var noteTranslationObject = {"cb":11,"cn":0,"c":0,"c#":1,"db":1,"dn":2,"d":2,"d#":3,"eb":3,"en":4,"e":4,"e#":5,"fb":4,"fn":5,"f":5,"f#":6,"gb":6,"gn":7,"g":7,"g#":8,"ab":8,"an":9,"a":9,"a#":10,"bb":10,"bn":11,"b":11,"b#":0};
	var octave = noteArray[1]-0;
	var length = (noteArray[3]/noteArray[4]);
	var step = noteTranslationObject[noteArray[2]];
	if ("cb" == noteArray[2]) { octave--; }
	if ("b#" == noteArray[2]) { octave++; }
	return {"note":step,"octave":octave,"length":length};
	} else { 
		console.log("bad note: "+noteArray.join(" ")); 
		return {}; 
	}} else {
		console.log("bad note"); 
		return {}; 
	}
}

function parseSequence (string) {
	if ("string" != typeof string) { string = "4c1/4;"; }
	var notes = string.split(";");
	var sequence = [];
	notes.forEach( function (note) {
		sequence.push( parseNote(note) );
	});
	return sequence;
}

function playNote (soundObject, note, octave, length, wave, delay) {
	if ("string" != typeof wave) { wave = "sine"; }
	if ("number" != typeof length) { length = 1; }
	if ("number" != typeof octave) { octave = 4; }
	if ("number" != typeof note) { note = 0; }
	if ("object" != typeof soundObject) { soundObject = new AudioContext(); }	
	if ("number" != typeof delay) { delay = 0; }
	var waveform = soundObject.createOscillator();
	var gain = soundObject.createGain();
	waveform.connect(gain);
	gain.connect(soundObject.destination);
	
	waveform.type = wave;
	waveform.frequency.setValueAtTime(getFrequency(note,octave), 0);
	gain.gain.setValueAtTime(1, soundObject.currentTime+delay);
	waveform.start(soundObject.currentTime+delay);
	gain.gain.exponentialRampToValueAtTime(0.00001,soundObject.currentTime+length+delay);
	waveform.stop(soundObject.currentTime+(length*1.5)+delay);
}

function playSequence (soundObject, sequenceArray, defaultWave, tempo) {
	if ("object" != typeof soundObject) { soundObject = new AudioContext(); }
	if ("string" != typeof defaultWave) { defaultWave = "sine"; }
	if ("sine" != defaultWave && "square" != defaultWave && "triangle" != defaultWave && "sawtooth" != defaultWave) { defaultWave = "sine"; }
	if ("number" != typeof tempo) { tempo = 60; }
	if (0 >= tempo) { tempo = 1; }
	if ("object" != typeof sequenceArray) { sequenceArray = [{"note":0,"octave":4,"length":1,"type":"sine"}]; }
	var timing = 0;
	sequenceArray.forEach( function (thisNote) {
		var adjustedLength = (thisNote.length*(60/tempo))*4;
		if ("undefined" == typeof thisNote.type) { thisNote.type = defaultWave; }
		playNote(soundObject, thisNote.note, thisNote.octave, adjustedLength, thisNote.type, timing);
		timing += adjustedLength/4;
	});
}