enum Notes {
    //% enumval=262
    C,
    //% enumval=277 blockId=C#
    CSharp,
    //% enumval=294
    D,
    //% enumval=311
    Eb,
    //% enumval=330
    E,
    //% enumval=349
    F,
    //% enumval=370  blockId=F#
    FSharp,
    //% enumval=392
    G,
    //% enumval=415  blockId=G#
    GSharp,
    //% enumval=440
    A,
    //% enumval=466
    Bb,
    //% enumval=494
    B,
    //% enumval=131
    C3,
    //% enumval=139  blockId=C#3
    CSharp3,
    //% enumval=147
    D3,
    //% enumval=156
    Eb3,
    //% enumval=165
    E3,
    //% enumval=175
    F3,
    //% enumval=185 blockId=F#3
    FSharp3,
    //% enumval=196
    G3,
    //% enumval=208 blockId=G#3
    GSharp3,
    //% enumval=220
    A3,
    //% enumval=233
    Bb3,
    //% enumval=247
    B3,
    //% enumval=262
    C4,
    //% enumval=277  blockId=C#4
    CSharp4,
    //% enumval=294
    D4,
    //% enumval=311
    Eb4,
    //% enumval=330
    E4,
    //% enumval=349
    F4,
    //% enumval=370 blockId=F#3
    FSharp4,
    //% enumval=392
    G4,
    //% enumval=415  blockId=G#3
    GSharp4,
    //% enumval=440
    A4,
    //% enumval=466
    Bb4,
    //% enumval=494
    B4,
    //% enumval=523
    C5,
    //% enumval=555 blockId=C#5
    CSharp5,
    //% enumval=587
    D5,
    //% enumval=622
    Eb5,
    //% enumval=659
    E5,
    //% enumval=698
    F5,
    //% enumval=740  blockId=F#5
    FSharp5,
    //% enumval=784
    G5,
    //% enumval=831 blockId=G#5
    GSharp5,
    //% enumval=880
    A5,
    //% enumval=932
    Bb5,
    //% enumval=989
    B5,
}

enum BeatFraction {
    //% enumval=1 blockId=1
    Whole = 1,
    //% enumval=2 blockId="1/2"
    Half = 2,
    //% enumval=4 blockId="1/4"
    Quater = 4,
    //% enumval=8 blockId="1/8"
    Eighth = 8,
    //% enumval=16 blockId="1/16"
    Sixteenth = 16
}

//% color=52 weight=33
namespace music {
    var beatsPerMinute: number = 120;

    /**
     * Plays a tone through pin ``P0`` for the given duration.
     * @param frequency TODO
     * @param ms TODO
     */
    //% help=music/play-tone weight=90
    //% blockId=device_play_note block="play|tone (Hz) %note=device_note|for (ms) %duration=device_beat" icon="\uf025" blockGap=8
    export function playTone(frequency: number, ms: number): void {
        pins.analogSetPitchPin(AnalogPins.P0);
        pins.analogPitch(frequency, ms);
    }

    /**
     * Plays a tone through pin ``P0``.
     * @param frequency TODO
     */
    //% help=music/ring-tone weight=80
    //% blockId=device_ring block="ring tone (Hz)|%note=device_note" icon="\uf025" blockGap=8
    export function ringTone(frequency: number): void {
        pins.analogSetPitchPin(AnalogPins.P0);
        pins.analogPitch(frequency, 0);
    }

    /**
     * Rests (plays nothing) for a specified time through pin ``P0``.
     * @param ms TODO
     */
    //% help=music/rest weight=79
    //% blockId=device_rest block="rest(ms)|%duration=device_beat"
    export function rest(ms: number): void {
        playTone(0, ms);
    }


    /**
     * Gets the frequency of a note.
     * @param name TODO
     */
    //% shim=TD_ID weight=50 help=music/note-frequency
    //% blockId=device_note block="%note"
    export function noteFrequency(name: Notes): number {
        return name;
    }
    
    function init() {
        if (beatsPerMinute <= 0) beatsPerMinute = 120;        
    }

    /**
     * Returns the duration of a beat in milli-seconds
     */
    //% help=music/beat weight=49
    //% blockId=device_beat block="%fraction|beat"
    export function beat(fraction : BeatFraction = BeatFraction.Whole): number {
        init();
        let beat = 60000 / beatsPerMinute;
        if (fraction == BeatFraction.Whole) return beat;
        else if (fraction == BeatFraction.Half) return beat / 2;
        else if (fraction == BeatFraction.Quater) return beat / 4
        else if (fraction == BeatFraction.Eighth) return beat / 8;
        else return beat / 16;
    }

    /**
     * Returns the tempo in beats per minute. Tempo is the speed (bpm = beats per minute) at which notes play. The larger the tempo value, the faster the notes will play.
     */
    //% help=music/tempo weight=40
    //% blockId=device_tempo block="tempo (bpm)" blockGap=8
    export function tempo(): number {
        init();
        return beatsPerMinute;
    }

    /**
     * Change the tempo by the specified amount
     * @param bpm The change in beats per minute to the tempo, eg: 20
     */
    //% help=music/tempo weight=39
    //% blockId=device_change_tempo block="change tempo by (bpm)|%value" blockGap=8
    export function changeTempoBy(bpm: number): void {
        setTempo(beat(BeatFraction.Whole) + bpm);
    }

    /**
     * Sets the tempo to the specified amount
     * @param bpm The new tempo in beats per minute, eg: 120
     */
    //% help=music/tempo weight=38
    //% blockId=device_set_tempo block="set tempo to (bpm)|%value"
    export function setTempo(bpm: number): void {
        init();
        if (bpm > 0) {
            beatsPerMinute = Math.max(1, bpm);
        }
    }
}