(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.fromJSON = function(o) {
        this.setup(o.data);
    };

    MIDIEvent.prototype.setup = function(data) {
        var raw_data = data;
        if (data.constructor === Object) {
            raw_data = data.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); //assume 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.prototype.toJSON = function() {
        return {
            data: [this.data[0], this.data[1], this.data[2]],
            object_class: "MIDIEvent"
        };
    };

    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"
    };

    MIDIEvent.commands_short = {
        0x80: "NOTEOFF",
        0x90: "NOTEOFF",
        0xa0: "KEYP",
        0xb0: "CC",
        0xc0: "PC",
        0xd0: "CP",
        0xe0: "PB",
        0xf0: "SYS",
        0xf2: "POS",
        0xf3: "SELECT",
        0xf6: "TUNEREQ",
        0xf8: "TT",
        0xfa: "START",
        0xfb: "CONTINUE",
        0xfc: "STOP",
        0xfe: "SENS",
        0xff: "RESET"
    };

    MIDIEvent.commands_reversed = {};
    for (var i in MIDIEvent.commands) {
        MIDIEvent.commands_reversed[MIDIEvent.commands[i]] = i;
    }

    //MIDI wrapper, instantiate by MIDIIn and MIDIOut
    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: []
        };

		this.input_ports = null;
		this.input_ports_info = [];
		this.output_ports = null;
		this.output_ports_info = [];

        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;
		this.input_ports_info = [];
        this.output_ports = midi.outputs;
		this.output_ports_info = [];

        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;
			this.input_ports_info.push(port_info);
            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;
        var it = this.output_ports.values();
        var it_value = it.next();
        while (it_value && it_value.done === false) {
            var port_info = it_value.value;
			this.output_ports_info.push(port_info);
            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;
    };

    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_info[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;
        this.boxcolor = "#AAA";
        this._last_time = 0;

        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_info.length; ++i) {
                var input = this._midi.input_ports_info[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.boxcolor = "#AFA";
        this._last_time = LiteGraph.getTime();
        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.onDrawBackground = function(ctx) {
        this.boxcolor = "#AAA";
        if (!this.flags.collapsed && this._last_midi_event) {
            ctx.fillStyle = "white";
            var now = LiteGraph.getTime();
            var f = 1.0 - Math.max(0, (now - this._last_time) * 0.001);
            if (f > 0) {
                var t = ctx.globalAlpha;
                ctx.globalAlpha *= f;
                ctx.font = "12px Tahoma";
                ctx.fillText(
                    this._last_midi_event.toString(),
                    2,
                    this.size[1] * 0.5 + 3
                );
                //ctx.fillRect(0,0,this.size[0],this.size[1]);
                ctx.globalAlpha = t;
            }
        }
    };

    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;
			that.widget.options.values = that.getMIDIOutputs();
        });
		this.widget = this.addWidget("combo","Device",this.properties.port,{ property: "port", values: this.getMIDIOutputs.bind(this) });
		this.size = [340,60];
    }

    LGMIDIOut.MIDIInterface = MIDIInterface;

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

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

        if (name == "port") {
			var values = this.getMIDIOutputs();
            return { type: "enum", values: values };
        }
    };
	LGMIDIOut.default_ports = {0:"unknown"};

	LGMIDIOut.prototype.getMIDIOutputs = function()
	{
		var values = {};
		if(!this._midi)
			return LGMIDIOut.default_ports;
		if(this._midi.output_ports_info)
		for (var i = 0; i < this._midi.output_ports_info.length; ++i) {
			var output = this._midi.output_ports_info[i];
			if(!output)
				continue;
			var name = i + ".- " + output.name + " version:" + output.version;
			values[i] = name;
		}
		return values;
	}

    LGMIDIOut.prototype.onAction = function(event, midi_event) {
        //console.log(midi_event);
        if (!this._midi) {
            return;
        }
        if (event == "send") {
            this._midi.sendMIDI(this.properties.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.getTitle = function() {
        if (this.flags.collapsed) {
            return this._str;
        }
        return this.title;
    };

    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 || this.flags.collapsed) {
            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
        };

        var that = this;
        this._learning = false;
        this.addWidget("button", "Learn", "", function() {
            that._learning = true;
            that.boxcolor = "#FA3";
        });

        this.addInput("in", LiteGraph.EVENT);
        this.addOutput("on_midi", LiteGraph.EVENT);
        this.boxcolor = "#AAA";
    }

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

    LGMIDIFilter["@cmd"] = {
        type: "enum",
        title: "Command",
        values: MIDIEvent.commands_reversed
    };

    LGMIDIFilter.prototype.getTitle = function() {
        var str = null;
        if (this.properties.cmd == -1) {
            str = "Nothing";
        } else {
            str = MIDIEvent.commands_short[this.properties.cmd] || "Unknown";
        }

        if (
            this.properties.min_value != -1 &&
            this.properties.max_value != -1
        ) {
            str +=
                " " +
                (this.properties.min_value == this.properties.max_value
                    ? this.properties.max_value
                    : this.properties.min_value +
                      ".." +
                      this.properties.max_value);
        }

        return "Filter: " + str;
    };

    LGMIDIFilter.prototype.onPropertyChanged = function(name, value) {
        if (name == "cmd") {
            var num = Number(value);
            if (isNaN(num)) {
                num = MIDIEvent.commands[value] || 0;
            }
            this.properties.cmd = num;
        }
    };

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

        if (this._learning) {
            this._learning = false;
            this.boxcolor = "#AAA";
            this.properties.channel = midi_event.channel;
            this.properties.cmd = midi_event.cmd;
            this.properties.min_value = this.properties.max_value =
                midi_event.data[1];
        } else {
            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();
        this.gate = false;
    }

    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];
            if (midi_event.cmd == MIDIEvent.NOTEON) {
                this.gate = true;
            } else if (midi_event.cmd == MIDIEvent.NOTEOFF) {
                this.gate = false;
            }
            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;
                    case "cmd":
                        var v = this.getInputData(i);
                        if (v != null) {
                            this.properties.cmd = v;
                        }
                        break;
                    case "value1":
                        var v = this.getInputData(i);
                        if (v != null) {
                            this.properties.value1 = clamp(v|0,0,127);
                        }
                        break;
                    case "value2":
                        var v = this.getInputData(i);
                        if (v != null) {
                            this.properties.value2 = clamp(v|0,0,127);
                        }
                        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;
                    case "gate":
                        v = this.gate;
                        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 [["cmd", "number"],["note", "number"],["value1", "number"],["value2", "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"],
            ["gate", "bool"],
            ["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 LGMIDIFromFile() {
        this.properties = {
            url: "",
			autoplay: true
        };

        this.addInput("play", LiteGraph.ACTION);
        this.addInput("pause", LiteGraph.ACTION);
        this.addOutput("note", LiteGraph.EVENT);
		this._midi = null;
		this._current_time = 0;
		this._playing = false;

        if (typeof MidiParser == "undefined") {
            console.error(
                "midi-parser.js not included, LGMidiPlay requires that library: https://raw.githubusercontent.com/colxi/midi-parser-js/master/src/main.js"
            );
            this.boxcolor = "red";
		}

	}

    LGMIDIFromFile.title = "MIDI fromFile";
    LGMIDIFromFile.desc = "Plays a MIDI file";
    LGMIDIFromFile.color = MIDI_COLOR;

	LGMIDIFromFile.prototype.onAction = function( name )
	{
		if(name == "play")
			this.play();
		else if(name == "pause")
			this._playing = !this._playing;
	}

	LGMIDIFromFile.prototype.onPropertyChanged = function(name,value)
	{
		if(name == "url")
			this.loadMIDIFile(value);
	}

    LGMIDIFromFile.prototype.onExecute = function() {
		if(!this._midi)
			return;

		if(!this._playing)
			return;

		this._current_time += this.graph.elapsed_time;
		var current_time = this._current_time * 100;

		for(var i = 0; i < this._midi.tracks; ++i)
		{
			var track = this._midi.track[i];
			if(!track._last_pos)
			{
				track._last_pos = 0;
				track._time = 0;
			}

			var elem = track.event[ track._last_pos ];
			if(elem && (track._time + elem.deltaTime) <= current_time )
			{
				track._last_pos++;
				track._time += elem.deltaTime;

				if(elem.data)
				{
					var midi_cmd = elem.type << 4 + elem.channel;
					var midi_event = new MIDIEvent();
					midi_event.setup([midi_cmd, elem.data[0], elem.data[1]]);
					this.trigger("note", midi_event);
				}
			}
			
		}
    };

	LGMIDIFromFile.prototype.play = function()
	{
		this._playing = true;
		this._current_time = 0;
		if(!this._midi)
			return;

		for(var i = 0; i < this._midi.tracks; ++i)
		{
			var track = this._midi.track[i];
			track._last_pos = 0;
			track._time = 0;
		}		
	}

	LGMIDIFromFile.prototype.loadMIDIFile = function(url)
	{
		var that = this;
		LiteGraph.fetchFile( url, "arraybuffer", function(data)
		{
			that.boxcolor = "#AFA";
			that._midi = MidiParser.parse( new Uint8Array(data) );
			if(that.properties.autoplay)
				that.play();
		}, function(err){
			that.boxcolor = "#FAA";
			that._midi = null;
		});
	}

	LGMIDIFromFile.prototype.onDropFile = function(file)
	{
		this.properties.url = "";
		this.loadMIDIFile( file );
	}

    LiteGraph.registerNodeType("midi/fromFile", LGMIDIFromFile);


    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.onDrawForeground = 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];

        ctx.globalAlpha = 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);