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

/**
 * A basic triangle wave instrument implementation
 * which implements envelope and volume control
 *
 * @author Andrew Brown and Andrew Sorensen
 */

public final class TriangleInst extends Instrument {
    //----------------------------------------------
    // Attributes
    //----------------------------------------------

    /**
     * The points to use in the construction of Envelopes
     */
    private EnvPoint[] pointArray = new EnvPoint[10];
    private int sampleRate;
    private int channels;
    private SampleOut sout;

    //----------------------------------------------
    // Constructor
    //----------------------------------------------

    /**
     * Basic default constructor to set an initial
     * sampling rate and buffersize in addition
     * to the neccessary frequency relationships
     * and volumes for each frequency to be added
     * the instrument
     *
     * @param sampleRate
     */
    public TriangleInst(int sampleRate) {
        this(sampleRate, 2);
    }

    /**
     * Basic default constructor to set an initial
     * sampling rate and buffersize in addition
     * to the neccessary frequency relationships
     * and volumes for each frequency to be added
     * the instrument
     *
     * @param sampleRate In hertz
     * @param channels   1 = mono, 2 = Stereo
     */
    public TriangleInst(int sampleRate, int channels) {
        this.sampleRate = sampleRate;
        this.channels = channels;
        EnvPoint[] tempArray = {
                new EnvPoint((float) 0.0, (float) 0.0),
                new EnvPoint((float) 0.02, (float) 1.0),
                new EnvPoint((float) 0.15, (float) 0.6),
                new EnvPoint((float) 0.9, (float) 0.3),
                new EnvPoint((float) 1.0, (float) 0.0)
        };
        pointArray = tempArray;
    }

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

    /**
     * Initialisation method used to build the objects that
     * this instrument will use
     */
    public void createChain() {
        Oscillator wt = new Oscillator(this, Oscillator.TRIANGLE_WAVE,
                this.sampleRate, this.channels);
        Envelope env = new Envelope(wt, pointArray);
        Volume vol = new Volume(env);
        Filter filt = new Filter(vol, (float) (this.sampleRate / 2.1),
                Filter.LOW_PASS);
        StereoPan span = new StereoPan(filt);
        if (output == RENDER) sout = new SampleOut(span);
    }
}