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

/**
 * A monophonic sawtooth waveform instrument implementation
 * which includes a static low pass filter.
 *
 * @author Andrew Brown
 */

public class SawLPFInst extends Instrument {
    //----------------------------------------------
    // Attributes
    //----------------------------------------------
    private int sampleRate;
    private int filterCutoff;
    private int channels;

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

    /**
     * Basic default constructor to set an initial
     * sampling rate and use a default cutoff.
     *
     * @param sampleRate
     */
    public SawLPFInst(int sampleRate) {
        this(sampleRate, 1000);
    }

    /**
     * Constructor that sets sample rate and the filter cutoff frequency.
     *
     * @param sampleRate   The number of samples per second (quality)
     * @param filterCutoff The frequency above which overtones are cut
     */
    public SawLPFInst(int sampleRate, int filterCutoff) {
        this.sampleRate = sampleRate;
        this.filterCutoff = filterCutoff;
        this.channels = 1;
    }

    /**
     * Constructor that sets sample rate and the filter cutoff frequency.
     *
     * @param sampleRate   The number of samples per second (quality)
     * @param filterCutoff The frequency above which overtones are cut
     * @param channels     The numbers of channels, 1 = mono, 2 = stereo
     */
    public SawLPFInst(int sampleRate, int filterCutoff, int channels) {
        this.sampleRate = sampleRate;
        this.filterCutoff = filterCutoff;
        this.channels = channels;
    }

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

    /**
     * Initialisation method used to build the objects that
     * this instrument will use and specify thier interconnections.
     */
    public void createChain() {
        Oscillator osc = new Oscillator(this, Oscillator.SAWTOOTH_WAVE, this.sampleRate, this.channels);
        Filter filt = new Filter(osc, this.filterCutoff, Filter.LOW_PASS);
        //Envelope env = new Envelope(filt,
        //new double[] {0.0, 0.0, 0.1, 1.0, 0.2, 0.6, 0.8, 0.4, 1.0, 0.0});
        ADSR env = new ADSR(filt, 20, 100, 0.6, 400);
        Volume vol = new Volume(env);
        StereoPan span = new StereoPan(vol);
        SampleOut sout = new SampleOut(span);
    }
}