(function( global )
{

var LiteGraph = global.LiteGraph;
var MIDI_COLOR = "#243";


function MIDIEvent( data )
{
	this.channel = 0;
	this.cmd = 0;
	this.data = new Uint32Array(3);

	if(data)
		this.setup(data)
}

LiteGraph.MIDIEvent = MIDIEvent;

MIDIEvent.prototype.setup = function( raw_data )
{
	this.data.set(raw_data);

	var midiStatus = raw_data[0];
	this.status = midiStatus;

	var midiCommand = midiStatus & 0xF0;

	if(midiStatus >= 0xF0)
		this.cmd = midiStatus;
	else
		this.cmd = midiCommand;

	if(this.cmd == MIDIEvent.NOTEON && this.velocity == 0)
		this.cmd = MIDIEvent.NOTEOFF;

	this.cmd_str = MIDIEvent.commands[ this.cmd ] || "";

	if ( midiCommand >= MIDIEvent.NOTEON || midiCommand <= MIDIEvent.NOTEOFF ) {
		this.channel =  midiStatus & 0x0F;
	}
}

Object.defineProperty( MIDIEvent.prototype, "velocity", {
	get: function() {
		if(this.cmd == MIDIEvent.NOTEON)
			return this.data[2];
		return -1;
	},
	set: function(v) {
		this.data[2] = v; //  v / 127;
	},
	enumerable: true
});

MIDIEvent.notes = ["A","A#","B","C","C#","D","D#","E","F","F#","G","G#"];
MIDIEvent.note_to_index = {"A":0,"A#":1,"B":2,"C":3,"C#":4,"D":5,"D#":6,"E":7,"F":8,"F#":9,"G":10,"G#":11};

Object.defineProperty( MIDIEvent.prototype, "note", {
	get: function() {
		if(this.cmd != MIDIEvent.NOTEON)
			return -1;
		return MIDIEvent.toNoteString( this.data[1], true );
	},
	set: function(v) {
		throw("notes cannot be assigned this way, must modify the data[1]");
	},
	enumerable: true
});

Object.defineProperty( MIDIEvent.prototype, "octave", {
	get: function() {
		if(this.cmd != MIDIEvent.NOTEON)
			return -1;
		var octave = this.data[1] - 24;
		return Math.floor(octave / 12 + 1);
	},
	set: function(v) {
		throw("octave cannot be assigned this way, must modify the data[1]");
	},
	enumerable: true
});

//returns HZs
MIDIEvent.prototype.getPitch = function()
{
	return Math.pow(2, (this.data[1] - 69) / 12 ) * 440;
}

MIDIEvent.computePitch = function( note )
{
	return Math.pow(2, (note - 69) / 12 ) * 440;
}

MIDIEvent.prototype.getCC = function()
{
	return this.data[1];
}

MIDIEvent.prototype.getCCValue = function()
{
	return this.data[2];
}

//not tested, there is a formula missing here
MIDIEvent.prototype.getPitchBend = function()
{
	return this.data[1] + (this.data[2] << 7) - 8192;
}

MIDIEvent.computePitchBend = function(v1,v2)
{
	return v1 + (v2 << 7) - 8192;
}

MIDIEvent.prototype.setCommandFromString = function( str )
{
	this.cmd = MIDIEvent.computeCommandFromString(str);
}

MIDIEvent.computeCommandFromString = function( str )
{
	if(!str)
		return 0;

	if(str && str.constructor === Number)
		return str;

	str = str.toUpperCase();
	switch( str )
	{
		case "NOTE ON":
		case "NOTEON": return MIDIEvent.NOTEON; break;
		case "NOTE OFF":
		case "NOTEOFF": return MIDIEvent.NOTEON; break;
		case "KEY PRESSURE": 
		case "KEYPRESSURE": return MIDIEvent.KEYPRESSURE; break;
		case "CONTROLLER CHANGE": 
		case "CONTROLLERCHANGE": 
		case "CC": return MIDIEvent.CONTROLLERCHANGE; break;
		case "PROGRAM CHANGE":
		case "PROGRAMCHANGE":
		case "PC": return MIDIEvent.PROGRAMCHANGE; break;
		case "CHANNEL PRESSURE":
		case "CHANNELPRESSURE": return MIDIEvent.CHANNELPRESSURE; break;
		case "PITCH BEND":
		case "PITCHBEND": return MIDIEvent.PITCHBEND; break;
		case "TIME TICK":
		case "TIMETICK": return MIDIEvent.TIMETICK; break;
		default: return Number(str); //asume its a hex code
	}
}

//transform from a pitch number to string like "C4"
MIDIEvent.toNoteString = function( d, skip_octave )
{
	d = Math.round(d); //in case it has decimals
	var note = d - 21;
	var octave = Math.floor((d - 24) / 12 + 1);
	note = note % 12;
	if(note < 0)
		note = 12 + note;
	return MIDIEvent.notes[ note ] + (skip_octave ? "" : octave);
}

MIDIEvent.NoteStringToPitch = function(str)
{
	str = str.toUpperCase();
	var note = str[0];
	var octave = 4;
	
	if(str[1] == "#")
	{
		note += "#";
		if( str.length > 2 )
			octave = Number( str[2] );
	}
	else
	{
		if( str.length > 1 )
			octave = Number( str[1] );
	}
	var pitch = MIDIEvent.note_to_index[note];
	if(pitch == null)
		return null;
	return ((octave - 1) * 12) + pitch + 21;
}

MIDIEvent.prototype.toString = function()
{
	var str = "" + this.channel + ". " ;
	switch( this.cmd )
	{
		case MIDIEvent.NOTEON: str += "NOTEON " + MIDIEvent.toNoteString( this.data[1] ); break;
		case MIDIEvent.NOTEOFF: str += "NOTEOFF " + MIDIEvent.toNoteString( this.data[1] ); break;
		case MIDIEvent.CONTROLLERCHANGE: str += "CC " + this.data[1] + " " + this.data[2]; break;
		case MIDIEvent.PROGRAMCHANGE: str += "PC " + this.data[1]; break;
		case MIDIEvent.PITCHBEND: str += "PITCHBEND " + this.getPitchBend(); break;
		case MIDIEvent.KEYPRESSURE: str += "KEYPRESS " + this.data[1]; break;
	}

	return str;
}

MIDIEvent.prototype.toHexString = function()
{
	var str = "";
	for(var i = 0; i < this.data.length; i++)
		str += this.data[i].toString(16) + " ";
}

MIDIEvent.NOTEOFF = 0x80;
MIDIEvent.NOTEON = 0x90;
MIDIEvent.KEYPRESSURE = 0xA0;
MIDIEvent.CONTROLLERCHANGE = 0xB0;
MIDIEvent.PROGRAMCHANGE = 0xC0;
MIDIEvent.CHANNELPRESSURE = 0xD0;
MIDIEvent.PITCHBEND = 0xE0;
MIDIEvent.TIMETICK = 0xF8;

MIDIEvent.commands = {
	0x80: "note off",
	0x90: "note on",
	0xA0: "key pressure",
	0xB0: "controller change",
	0xC0: "program change",
	0xD0: "channel pressure",
	0xE0: "pitch bend",
	0xF0: "system",
	0xF2: "Song pos",
	0xF3: "Song select",
	0xF6: "Tune request",
	0xF8: "time tick",
	0xFA: "Start Song",
	0xFB: "Continue Song",
	0xFC: "Stop Song",
	0xFE: "Sensing",
	0xFF: "Reset"
}

//MIDI wrapper
function MIDIInterface( on_ready, on_error )
{
	if(!navigator.requestMIDIAccess)
	{
		this.error = "not suppoorted";
		if(on_error)
			on_error("Not supported");
		else
			console.error("MIDI NOT SUPPORTED, enable by chrome://flags");
		return;
	}

	this.on_ready = on_ready;

	this.state = {
		note: [],
		cc: []
	};



	navigator.requestMIDIAccess().then( this.onMIDISuccess.bind(this), this.onMIDIFailure.bind(this) );
}

MIDIInterface.input = null;

MIDIInterface.MIDIEvent = MIDIEvent;

MIDIInterface.prototype.onMIDISuccess = function(midiAccess)
{
	console.log( "MIDI ready!" );
	console.log( midiAccess );
	this.midi = midiAccess;  // store in the global (in real usage, would probably keep in an object instance)
	this.updatePorts();

	if (this.on_ready)
		this.on_ready(this);
}

MIDIInterface.prototype.updatePorts = function()
{
	var midi = this.midi;
	this.input_ports = midi.inputs;
	var num = 0;

	var it = this.input_ports.values();
	var it_value = it.next();
	while( it_value && it_value.done === false )
	{
		var port_info = it_value.value;
		console.log( "Input port [type:'" + port_info.type + "'] id:'" + port_info.id +
		  "' manufacturer:'" + port_info.manufacturer + "' name:'" + port_info.name +
		  "' version:'" + port_info.version + "'" );
			num++;
		it_value = it.next();
	}
	this.num_input_ports = num;

	num = 0;
	this.output_ports = midi.outputs;
	var it = this.output_ports.values();
	var it_value = it.next();
	while( it_value && it_value.done === false )
	{
		var port_info = it_value.value;
		console.log( "Output port [type:'" + port_info.type + "'] id:'" + port_info.id +
		  "' manufacturer:'" + port_info.manufacturer + "' name:'" + port_info.name +
		  "' version:'" + port_info.version + "'" );
			num++;
		it_value = it.next();
	  }
	this.num_output_ports = num;


	/* OLD WAY
	for (var i = 0; i < this.input_ports.size; ++i) {
		  var input = this.input_ports.get(i);
		  if(!input)
			  continue; //sometimes it is null?!
			console.log( "Input port [type:'" + input.type + "'] id:'" + input.id +
		  "' manufacturer:'" + input.manufacturer + "' name:'" + input.name +
		  "' version:'" + input.version + "'" );
			num++;
	  }
	this.num_input_ports = num;


	num = 0;
	this.output_ports = midi.outputs;
	for (var i = 0; i < this.output_ports.size; ++i) {
		  var output = this.output_ports.get(i);
		  if(!output)
			  continue; 
		console.log( "Output port [type:'" + output.type + "'] id:'" + output.id +
		  "' manufacturer:'" + output.manufacturer + "' name:'" + output.name +
		  "' version:'" + output.version + "'" );
			num++;
	  }
	this.num_output_ports = num;
	*/
}

MIDIInterface.prototype.onMIDIFailure = function(msg)
{
	console.error( "Failed to get MIDI access - " + msg );
}

MIDIInterface.prototype.openInputPort = function( port, callback )
{
	var input_port = this.input_ports.get( "input-" + port );
	if(!input_port)
		return false;
	MIDIInterface.input = this;
	var that = this;

	input_port.onmidimessage = function(a) {
		var midi_event = new MIDIEvent(a.data);
		that.updateState( midi_event );
		if(callback)
			callback(a.data, midi_event );
		if(MIDIInterface.on_message)
			MIDIInterface.on_message( a.data, midi_event );
	}
	console.log("port open: ", input_port);
	return true;
}

MIDIInterface.parseMsg = function(data)
{

}

MIDIInterface.prototype.updateState = function( midi_event )
{
	switch( midi_event.cmd )
	{
		case MIDIEvent.NOTEON: this.state.note[ midi_event.value1|0 ] = midi_event.value2; break;
		case MIDIEvent.NOTEOFF: this.state.note[ midi_event.value1|0 ] = 0; break;
		case MIDIEvent.CONTROLLERCHANGE: this.state.cc[ midi_event.getCC() ] = midi_event.getCCValue(); break;
	}
}

MIDIInterface.prototype.sendMIDI = function( port, midi_data )
{
	if( !midi_data )
		return;

	var output_port = this.output_ports.get( "output-" + port );
	if(!output_port)
		return;

	MIDIInterface.output = this;

	if( midi_data.constructor === MIDIEvent)
		output_port.send( midi_data.data ); 
	else
		output_port.send( midi_data ); 
}



function LGMIDIIn()
{
	this.addOutput( "on_midi", LiteGraph.EVENT );
	this.addOutput( "out", "midi" );
	this.properties = {port: 0};
	this._last_midi_event = null;
	this._current_midi_event = null;

	var that = this;
	new MIDIInterface( function( midi ){
		//open
		that._midi = midi;
		if(that._waiting)
			that.onStart();
		that._waiting = false;
	});
}

LGMIDIIn.MIDIInterface = MIDIInterface;

LGMIDIIn.title = "MIDI Input";
LGMIDIIn.desc = "Reads MIDI from a input port";
LGMIDIIn.color = MIDI_COLOR;


LGMIDIIn.prototype.getPropertyInfo = function(name)
{
	if(!this._midi)
		return;

	if(name == "port")
	{
		var values = {};
		for (var i = 0; i < this._midi.input_ports.size; ++i)
		{
			var input = this._midi.input_ports.get( "input-" + i);
			values[i] = i + ".- " + input.name + " version:" + input.version;
		}
		return { type: "enum", values: values };
	}
}

LGMIDIIn.prototype.onStart = function()
{
	if(this._midi)
		this._midi.openInputPort( this.properties.port, this.onMIDIEvent.bind(this) );
	else
		this._waiting = true;
}

LGMIDIIn.prototype.onMIDIEvent = function( data, midi_event )
{
	this._last_midi_event = midi_event;

	this.trigger( "on_midi", midi_event );
	if(midi_event.cmd == MIDIEvent.NOTEON)
		this.trigger( "on_noteon", midi_event );
	else if(midi_event.cmd == MIDIEvent.NOTEOFF)
		this.trigger( "on_noteoff", midi_event );
	else if(midi_event.cmd == MIDIEvent.CONTROLLERCHANGE)
		this.trigger( "on_cc", midi_event );
	else if(midi_event.cmd == MIDIEvent.PROGRAMCHANGE)
		this.trigger( "on_pc", midi_event );
	else if(midi_event.cmd == MIDIEvent.PITCHBEND)
		this.trigger( "on_pitchbend", midi_event );
}

LGMIDIIn.prototype.onExecute = function()
{
	if(this.outputs)
	{
		var last = this._last_midi_event;
		for(var i = 0; i < this.outputs.length; ++i)
		{
			var output = this.outputs[i];
			var v = null;
			switch (output.name)
			{
				case "midi": v = this._midi; break;
				case "last_midi": v = last; break;
				default:
					continue;
			}
			this.setOutputData( i, v );
		}
	}
}

LGMIDIIn.prototype.onGetOutputs = function() {
	return [
		["last_midi","midi"],
		["on_midi",LiteGraph.EVENT],
		["on_noteon",LiteGraph.EVENT],
		["on_noteoff",LiteGraph.EVENT],
		["on_cc",LiteGraph.EVENT],
		["on_pc",LiteGraph.EVENT],
		["on_pitchbend",LiteGraph.EVENT]
	];
}

LiteGraph.registerNodeType("midi/input", LGMIDIIn);


function LGMIDIOut()
{
	this.addInput( "send", LiteGraph.EVENT );
	this.properties = {port: 0};

	var that = this;
	new MIDIInterface( function( midi ){
		that._midi = midi;
	});
}

LGMIDIOut.MIDIInterface = MIDIInterface;

LGMIDIOut.title = "MIDI Output";
LGMIDIOut.desc = "Sends MIDI to output channel";
LGMIDIOut.color = MIDI_COLOR;

LGMIDIOut.prototype.getPropertyInfo = function(name)
{
	if(!this._midi)
		return;

	if(name == "port")
	{
		var values = {};
		for (var i = 0; i < this._midi.output_ports.size; ++i)
		{
			var output = this._midi.output_ports.get(i);
			values[i] = i + ".- " + output.name + " version:" + output.version;
		}
		return { type: "enum", values: values };
	}
}


LGMIDIOut.prototype.onAction = function(event, midi_event )
{
	//console.log(midi_event);
	if(!this._midi)
		return;
	if(event == "send")
		this._midi.sendMIDI( this.port, midi_event );
	this.trigger("midi",midi_event);
}

LGMIDIOut.prototype.onGetInputs = function() {
	return [["send",LiteGraph.ACTION]];
}

LGMIDIOut.prototype.onGetOutputs = function() {
	return [["on_midi",LiteGraph.EVENT]];
}

LiteGraph.registerNodeType("midi/output", LGMIDIOut);


function LGMIDIShow()
{
	this.addInput( "on_midi", LiteGraph.EVENT );
	this._str = "";
	this.size = [200,40]
}

LGMIDIShow.title = "MIDI Show";
LGMIDIShow.desc = "Shows MIDI in the graph";
LGMIDIShow.color = MIDI_COLOR;


LGMIDIShow.prototype.onAction = function(event, midi_event )
{
	if(!midi_event)
		return;
	if(midi_event.constructor === MIDIEvent)
		this._str = midi_event.toString();
	else
		this._str = "???";
}

LGMIDIShow.prototype.onDrawForeground = function( ctx )
{
	if( !this._str )
		return;

	ctx.font = "30px Arial";
	ctx.fillText( this._str, 10, this.size[1] * 0.8 );
}

LGMIDIShow.prototype.onGetInputs = function() {
	return [["in",LiteGraph.ACTION]];
}

LGMIDIShow.prototype.onGetOutputs = function() {
	return [["on_midi",LiteGraph.EVENT]];
}

LiteGraph.registerNodeType("midi/show", LGMIDIShow);



function LGMIDIFilter()
{
	this.properties = {
		channel: -1,
		cmd: -1,
		min_value: -1,
		max_value: -1
	};

	this.addInput( "in", LiteGraph.EVENT );
	this.addOutput( "on_midi", LiteGraph.EVENT );
}

LGMIDIFilter.title = "MIDI Filter";
LGMIDIFilter.desc = "Filters MIDI messages";
LGMIDIFilter.color = MIDI_COLOR;

LGMIDIFilter.prototype.onAction = function(event, midi_event )
{
	if(!midi_event || midi_event.constructor !== MIDIEvent)
		return;

	if( this.properties.channel != -1 && midi_event.channel != this.properties.channel)
		return;
	if(this.properties.cmd != -1 && midi_event.cmd != this.properties.cmd)
		return;
	if(this.properties.min_value != -1 && midi_event.data[1] < this.properties.min_value)
		return;
	if(this.properties.max_value != -1 && midi_event.data[1] > this.properties.max_value)
		return;
	this.trigger("on_midi",midi_event);
}

LiteGraph.registerNodeType("midi/filter", LGMIDIFilter);


function LGMIDIEvent()
{
	this.properties = {
		channel: 0,
		cmd: 144, //0x90
		value1: 1,
		value2: 1
	};

	this.addInput( "send", LiteGraph.EVENT );
	this.addInput( "assign", LiteGraph.EVENT );
	this.addOutput( "on_midi", LiteGraph.EVENT );

	this.midi_event = new MIDIEvent();
}

LGMIDIEvent.title = "MIDIEvent";
LGMIDIEvent.desc = "Create a MIDI Event";
LGMIDIEvent.color = MIDI_COLOR;

LGMIDIEvent.prototype.onAction = function( event, midi_event )
{
	if(event == "assign")
	{
		this.properties.channel = midi_event.channel;
		this.properties.cmd = midi_event.cmd;
		this.properties.value1 = midi_event.data[1];
		this.properties.value2 = midi_event.data[2];
		return;
	}

	//send
	var midi_event = this.midi_event;
	midi_event.channel = this.properties.channel;
	if(this.properties.cmd && this.properties.cmd.constructor === String)
		midi_event.setCommandFromString( this.properties.cmd );
	else
		midi_event.cmd = this.properties.cmd;
	midi_event.data[0] = midi_event.cmd | midi_event.channel;
	midi_event.data[1] = Number(this.properties.value1);
	midi_event.data[2] = Number(this.properties.value2);

	this.trigger("on_midi",midi_event);
}

LGMIDIEvent.prototype.onExecute = function()
{
	var props = this.properties;

	if(this.inputs)
	{
		for(var i = 0; i < this.inputs.length; ++i)
		{
			var input = this.inputs[i];
			if(input.link == -1)
				continue;
			switch (input.name)
			{
				case "note": 
					var v = this.getInputData(i);
					if(v != null)
					{
						if(v.constructor === String)
							v = MIDIEvent.NoteStringToPitch(v);
						this.properties.value1 = (v|0)%255;
					}
					break;
			}
		}
	}

	if(this.outputs)
	{
		for(var i = 0; i < this.outputs.length; ++i)
		{
			var output = this.outputs[i];
			var v = null;
			switch (output.name)
			{
				case "midi": 
					v = new MIDIEvent(); 
					v.setup([ props.cmd, props.value1, props.value2 ]);
					v.channel = props.channel;
					break;
				case "command": v = props.cmd; break;
				case "cc": v = props.value1; break;
				case "cc_value": v = props.value2; break;
				case "note": v = (props.cmd == MIDIEvent.NOTEON || props.cmd == MIDIEvent.NOTEOFF) ? props.value1 : null; break;
				case "velocity": v = props.cmd == MIDIEvent.NOTEON ? props.value2 : null; break;
				case "pitch": v = props.cmd == MIDIEvent.NOTEON ? MIDIEvent.computePitch( props.value1 ) : null; break;
				case "pitchbend": v = props.cmd == MIDIEvent.PITCHBEND ? MIDIEvent.computePitchBend( props.value1, props.value2 ) : null; break;
				default:
					continue;
			}
			if(v !== null)
				this.setOutputData( i, v );
		}
	}
}

LGMIDIEvent.prototype.onPropertyChanged = function(name,value)
{
	if(name == "cmd")
		this.properties.cmd = MIDIEvent.computeCommandFromString( value );
}

LGMIDIEvent.prototype.onGetInputs = function() {
	return [ ["note","number"] ];
}

LGMIDIEvent.prototype.onGetOutputs = function() {
	return [
		["midi","midi"],
		["on_midi",LiteGraph.EVENT],
		["command","number"],
		["note","number"],
		["velocity","number"],
		["cc","number"],
		["cc_value","number"],
		["pitch","number"],
		["pitchbend","number"]
	];
}


LiteGraph.registerNodeType("midi/event", LGMIDIEvent);


function LGMIDICC()
{
	this.properties = {
//		channel: 0,
		cc: 1,
		value: 0
	};

	this.addOutput( "value", "number" );
}

LGMIDICC.title = "MIDICC";
LGMIDICC.desc = "gets a Controller Change";
LGMIDICC.color = MIDI_COLOR;

LGMIDICC.prototype.onExecute = function()
{
	var props = this.properties;
	if( MIDIInterface.input )
		this.properties.value = MIDIInterface.input.state.cc[ this.properties.cc ];
	this.setOutputData( 0, this.properties.value );
}

LiteGraph.registerNodeType("midi/cc", LGMIDICC);


function LGMIDIGenerator()
{
	this.addInput( "generate", LiteGraph.ACTION );
	this.addInput( "scale", "string" );
	this.addInput( "octave", "number" );
	this.addOutput( "note", LiteGraph.EVENT );
	this.properties = {
		notes: "A,A#,B,C,C#,D,D#,E,F,F#,G,G#",
		octave: 2,
		duration: 0.5,
		mode: "sequence"
	};

	this.notes_pitches = LGMIDIGenerator.processScale( this.properties.notes );
	this.sequence_index = 0;
}

LGMIDIGenerator.title = "MIDI Generator";
LGMIDIGenerator.desc = "Generates a random MIDI note";
LGMIDIGenerator.color = MIDI_COLOR;

LGMIDIGenerator.processScale = function(scale)
{
	var notes = scale.split(",");
	for(var i = 0; i < notes.length; ++i)
	{
		var n = notes[i];
		if( (n.length == 2 && n[1] != "#" ) || n.length > 2)
			notes[i] = -LiteGraph.MIDIEvent.NoteStringToPitch(n);
		else
			notes[i] = MIDIEvent.note_to_index[ n ] || 0;
	}
	return notes;
}

LGMIDIGenerator.prototype.onPropertyChanged = function(name,value)
{
	if(name == "notes")
		this.notes_pitches = LGMIDIGenerator.processScale( value );
}

LGMIDIGenerator.prototype.onExecute = function()
{
	var octave = this.getInputData(2);
	if(octave != null)
		this.properties.octave = octave;

	var scale = this.getInputData(1);
	if(scale)
		this.notes_pitches = LGMIDIGenerator.processScale( scale );
}

LGMIDIGenerator.prototype.onAction = function( event, midi_event )
{
	//var range = this.properties.max - this.properties.min;
	//var pitch = this.properties.min + ((Math.random() * range)|0);
	var pitch = 0;
	var range = this.notes_pitches.length;
	var index = 0;
	
	if( this.properties.mode == "sequence" )
		index = this.sequence_index = (this.sequence_index + 1) % range;
	else if( this.properties.mode == "random" )
		index = Math.floor(Math.random()*range);

	var note = this.notes_pitches[ index ];
	if(note >= 0)
		pitch = note + ( (this.properties.octave-1) * 12) + 33;
	else
		pitch = -note;

	var midi_event = new MIDIEvent(); 
	midi_event.setup([ MIDIEvent.NOTEON, pitch, 10 ]);
	var duration = this.properties.duration || 1;
	this.trigger("note", midi_event);

	//noteoff
	setTimeout( (function(){
		var midi_event = new MIDIEvent(); 
		midi_event.setup([ MIDIEvent.NOTEOFF, pitch, 0 ]);
		this.trigger("note", midi_event);
	}).bind(this), duration * 1000 );
}


LiteGraph.registerNodeType("midi/generator", LGMIDIGenerator);

function LGMIDITranspose()
{
	this.properties = {
		amount: 0
	};
	this.addInput( "in", LiteGraph.ACTION );
	this.addInput( "amount", "number" );
	this.addOutput( "out", LiteGraph.EVENT );

	this.midi_event = new MIDIEvent();
}

LGMIDITranspose.title = "MIDI Transpose";
LGMIDITranspose.desc = "Transpose a MIDI note";
LGMIDITranspose.color = MIDI_COLOR;

LGMIDITranspose.prototype.onAction = function( event, midi_event )
{
	if( !midi_event || midi_event.constructor !== MIDIEvent )
		return;

	if( midi_event.data[0] == MIDIEvent.NOTEON || midi_event.data[0] == MIDIEvent.NOTEOFF )
	{
		this.midi_event = new MIDIEvent();
		this.midi_event.setup( midi_event.data );
		this.midi_event.data[1] = Math.round( this.midi_event.data[1] + this.properties.amount );
		this.trigger("out", this.midi_event );
	}
	else
		this.trigger("out", midi_event );
}

LGMIDITranspose.prototype.onExecute = function()
{
	var amount = this.getInputData(1);
	if(amount!= null)
		this.properties.amount = amount;
}

LiteGraph.registerNodeType("midi/transpose", LGMIDITranspose);


function LGMIDIQuantize()
{
	this.properties = {
		scale: "A,A#,B,C,C#,D,D#,E,F,F#,G,G#"
	};
	this.addInput( "note", LiteGraph.ACTION );
	this.addInput( "scale", "string" );
	this.addOutput( "out", LiteGraph.EVENT );
	
	this.valid_notes = new Array(12);
	this.offset_notes = new Array(12);
	this.processScale( this.properties.scale );
}

LGMIDIQuantize.title = "MIDI Quantize Pitch";
LGMIDIQuantize.desc = "Transpose a MIDI note tp fit an scale";
LGMIDIQuantize.color = MIDI_COLOR;

LGMIDIQuantize.prototype.onPropertyChanged = function(name,value)
{
	if(name == "scale")
		this.processScale( value );
}


LGMIDIQuantize.prototype.processScale = function( scale )
{
	this._current_scale = scale;
	this.notes_pitches = LGMIDIGenerator.processScale( scale );
	for(var i = 0; i < 12; ++i)
		this.valid_notes[i] = this.notes_pitches.indexOf(i) != -1;
	for(var i = 0; i < 12; ++i)
	{
		if (this.valid_notes[ i ])
		{
			this.offset_notes[i] = 0;
			continue;
		}
		for(var j = 1; j < 12; ++j)
		{
			if( this.valid_notes[ (i - j)%12 ] )
			{
				this.offset_notes[i] = -j;
				break;
			}
			if( this.valid_notes[ (i + j)%12 ] )
			{
				this.offset_notes[i] = j;
				break;
			}
		}
	}
}

LGMIDIQuantize.prototype.onAction = function( event, midi_event )
{
	if( !midi_event || midi_event.constructor !== MIDIEvent )
		return;

	if( midi_event.data[0] == MIDIEvent.NOTEON || midi_event.data[0] == MIDIEvent.NOTEOFF )
	{
		this.midi_event = new MIDIEvent();
		this.midi_event.setup( midi_event.data );
		var note = midi_event.note;
		var index = MIDIEvent.note_to_index[ note ];
		var offset = this.offset_notes[index];
		this.midi_event.data[1] += offset;
		this.trigger("out", this.midi_event );
	}
	else
		this.trigger("out", midi_event );
}

LGMIDIQuantize.prototype.onExecute = function()
{
	var scale = this.getInputData(1);
	if(scale != null && scale != this._current_scale )
		this.processScale( scale );
}

LiteGraph.registerNodeType("midi/quantize", LGMIDIQuantize);


function LGMIDIPlay()
{
	this.properties = {
		volume: 0.5,
		duration: 1
	};
	this.addInput( "note", LiteGraph.ACTION );
	this.addInput( "volume", "number" );
	this.addInput( "duration", "number" );
	this.addOutput( "note", LiteGraph.EVENT );

	if(typeof(AudioSynth) == "undefined")
	{
		console.error("Audiosynth.js not included, LGMidiPlay requires that library");
		this.boxcolor = "red";
	}
	else
	{
		var Synth = this.synth = new AudioSynth();
		this.instrument = Synth.createInstrument('piano');
	}
}

LGMIDIPlay.title = "MIDI Play";
LGMIDIPlay.desc = "Plays a MIDI note";
LGMIDIPlay.color = MIDI_COLOR;

LGMIDIPlay.prototype.onAction = function( event, midi_event )
{
	if( !midi_event || midi_event.constructor !== MIDIEvent )
		return;

	if( this.instrument && midi_event.data[0] == MIDIEvent.NOTEON )
	{
		var note = midi_event.note; //C#
		if( !note || note == "undefined" || note.constructor !== String )
			return;
		this.instrument.play( note, midi_event.octave, this.properties.duration, this.properties.volume );
	}
	this.trigger("note", midi_event );
}

LGMIDIPlay.prototype.onExecute = function()
{
	var volume  = this.getInputData(1);
	if(volume != null)
		this.properties.volume = volume;

	var duration = this.getInputData(2);
	if(duration != null)
		this.properties.duration = duration;
}

LiteGraph.registerNodeType("midi/play", LGMIDIPlay);



function LGMIDIKeys()
{
	this.properties = {
		num_octaves: 2,
		start_octave: 2
	}
	this.addInput( "note", LiteGraph.ACTION );
	this.addInput( "reset", LiteGraph.ACTION );
	this.addOutput( "note", LiteGraph.EVENT );
	this.size = [400,100];
	this.keys = [];
	this._last_key = -1;
}

LGMIDIKeys.title = "MIDI Keys";
LGMIDIKeys.desc = "Keyboard to play notes";
LGMIDIKeys.color = MIDI_COLOR;

LGMIDIKeys.keys = [ 
	{x:0,w:1,h:1,t:0},
	{x:0.75,w:0.5,h:0.6,t:1},
	{x:1,w:1,h:1,t:0},
	{x:1.75,w:0.5,h:0.6,t:1},
	{x:2,w:1,h:1,t:0},
	{x:2.75,w:0.5,h:0.6,t:1},
	{x:3,w:1,h:1,t:0},
	{x:4,w:1,h:1,t:0},
	{x:4.75,w:0.5,h:0.6,t:1},
	{x:5,w:1,h:1,t:0},
	{x:5.75,w:0.5,h:0.6,t:1},
	{x:6,w:1,h:1,t:0}];

LGMIDIKeys.prototype.onDrawBackground = function(ctx)
{
	if(this.flags.collapsed)
		return;

	var num_keys = this.properties.num_octaves * 12;
	this.keys.length = num_keys;
	var key_width = this.size[0] / (this.properties.num_octaves * 7);
	var key_height = this.size[1];

	for(var k = 0; k < 2; k++) //draw first whites (0) then blacks (1)
		for(var i = 0; i < num_keys; ++i)
		{
			var key_info = LGMIDIKeys.keys[i%12];
			if( key_info.t != k )
				continue;
			var octave = Math.floor(i/12);
			var x = octave * 7 * key_width + key_info.x * key_width;
			if(k == 0)
				ctx.fillStyle = this.keys[i] ? "#CCC" : "white";
			else
				ctx.fillStyle = this.keys[i] ? "#333" : "black";
			ctx.fillRect( x+1, 0, key_width * key_info.w - 2, key_height * key_info.h ); 
		}
}

LGMIDIKeys.prototype.getKeyIndex = function(pos)
{
	var num_keys = this.properties.num_octaves * 12;
	var key_width = this.size[0] / (this.properties.num_octaves * 7);
	var key_height = this.size[1];

	for(var k = 1; k >= 0; k--) //test blacks first (1) then whites (0)
		for(var i = 0; i < this.keys.length; ++i)
		{
			var key_info = LGMIDIKeys.keys[i%12];
			if( key_info.t != k )
				continue;
			var octave = Math.floor(i/12);
			var x = octave * 7 * key_width + key_info.x * key_width;
			var w = key_width * key_info.w;
			var h = key_height * key_info.h;
			if( pos[0] < x || pos[0] > (x + w) || pos[1] > h )
				continue;
			return i;
		}
	return -1;
}

LGMIDIKeys.prototype.onAction = function(event, params)
{
	if(event == "reset")
	{
		for(var i = 0; i < this.keys.length; ++i)
			this.keys[i] = false;
		return;
	}

	if( !params || params.constructor !== MIDIEvent )
		return;
	var midi_event = params;
	var start_note = (this.properties.start_octave - 1) * 12 + 29;
	var index = midi_event.data[1] - start_note;
	if( index >= 0 && index < this.keys.length )
	{
		if(midi_event.data[0] == MIDIEvent.NOTEON)
			this.keys[index] = true;
		else if(midi_event.data[0] == MIDIEvent.NOTEOFF)
			this.keys[index] = false;
	}

	this.trigger("note",midi_event);
}


LGMIDIKeys.prototype.onMouseDown = function(e, pos)
{
	if(pos[1] < 0)
		return;
	var index = this.getKeyIndex( pos );
	this.keys[ index ] = true;
	this._last_key = index;
	var pitch = (this.properties.start_octave - 1) * 12 + 29 + index;
	var midi_event = new MIDIEvent();
	midi_event.setup([MIDIEvent.NOTEON, pitch, 100]);
	this.trigger("note",midi_event);
	return true;
}

LGMIDIKeys.prototype.onMouseMove = function(e, pos)
{
	if(pos[1] < 0 || this._last_key == -1)
		return;
	this.setDirtyCanvas(true);
	var index = this.getKeyIndex( pos );
	if (this._last_key == index)
		return true;
	this.keys[ this._last_key ] = false;
	var pitch = (this.properties.start_octave - 1) * 12 + 29 + this._last_key;
	var midi_event = new MIDIEvent();
	midi_event.setup([MIDIEvent.NOTEOFF, pitch, 100]);
	this.trigger("note",midi_event);

	this.keys[ index ] = true;
	var pitch = (this.properties.start_octave - 1) * 12 + 29 + index;
	var midi_event = new MIDIEvent();
	midi_event.setup([MIDIEvent.NOTEON, pitch, 100]);
	this.trigger("note",midi_event);

	this._last_key = index;
	return true;
}

LGMIDIKeys.prototype.onMouseUp = function(e, pos)
{
	if(pos[1] < 0)
		return;
	var index = this.getKeyIndex( pos );
	this.keys[ index ] = false;
	this._last_key = -1;
	var pitch = (this.properties.start_octave - 1) * 12 + 29 + index;
	var midi_event = new MIDIEvent();
	midi_event.setup([MIDIEvent.NOTEOFF, pitch, 100]);
	this.trigger("note",midi_event);
	return true;
}

LiteGraph.registerNodeType("midi/keys", LGMIDIKeys);




function now() { return window.performance.now() }

})( this );