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import jm.audio.Instrument;
import jm.audio.io.SampleOut;
import jm.audio.synth.*;

/**
 * A basic additive synthesis instrument implementation
 * which implements envelope and volume control
 *
 * @author Andrew Sorensen and Andrew Brown
 */
public final class TimpaniInst extends Instrument {
    //----------------------------------------------
    // Attributes
    //----------------------------------------------
    private int overtones = 5;
    /**
     * The points to use in the construction of Envelopes
     */
    private double[][] points = new double[overtones][8];
    /**
     * the relative frequencies which make up this note
     */
    private double[] freqVals = {1.0, 1.42, 1.53, 1.77, 1.94};
    /**
     * the volumes to use for each frequency
     */
    private double[] volVals = {1.0, 0.8, 0.7, 0.6, 0.5};
    private double[] pointArray1 = {0.0, 0.0, 0.002, 1.0, 0.3, 0.3, 1.0, 0.0};
    private double[] pointArray2 = {0.0, 0.0, 0.05, 1.0, 0.2, 0.4, 1.0, 0.0};
    private double[] pointArray3 = {0.0, 0.0, 0.1, 1.0, 0.4, 0.3, 1.0, 0.0};

    /**
     * Pan
     */
    private float pan;
    /**
     * The sample Rate to use
     */
    private int sampleRate;
    /**
     * The Oscillators to use for each frequency specified
     */
    private Oscillator[] osc;
    /**
     * The envelope to apply to each Oscillator's output
     */
    private Envelope[] env;
    /**
     * The volume to apply to each envelopes output
     */
    private Volume[] vol;

    //----------------------------------------------
    // Constructor
    //----------------------------------------------
    public TimpaniInst(int sampleRate) {
        this.sampleRate = sampleRate;
        // set up envelope points
        points[0] = pointArray1;
        points[1] = pointArray2;
        points[2] = pointArray3;
        points[3] = pointArray2;
        points[4] = pointArray3;
    }

    //----------------------------------------------
    // Methods
    //----------------------------------------------

    /**
     * Initialisation method is used to build the objects that
     * this instrument will use
     */
    public void createChain() {
        //define the audio chain(s)
        osc = new Oscillator[overtones];
        env = new Envelope[overtones];
        vol = new Volume[overtones];
        for (int i = 0; i < overtones; i++) {
            osc[i] = new Oscillator(this, Oscillator.SINE_WAVE,
                    this.sampleRate, 2);
            osc[i].setFrqRatio((float) freqVals[i]);
            env[i] = new Envelope(osc[i], points[i]);
            vol[i] = new Volume(env[i], (float) volVals[i]);
        }
        //And now the add object brings us back to one path.
        Add add = new Add(vol);
        StereoPan span = new StereoPan(add);
        SampleOut sout = new SampleOut(span);
    }
}