/*
 * Created on May 14, 2004
 *
 */
package jmsltutorial;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import com.softsynth.jmsl.*;
import com.softsynth.jmsl.jsyn.JSynInsFromClassName;
import com.softsynth.jmsl.jsyn.JSynMusicDevice;
import com.softsynth.jmsl.util.WeightedIntegerSequence;

/**
 * Plays a MusicJob which consults a WeightedIntegerSequence to play a random walk melody.  
 * TextFields allow the user to set the relative weights of choosing intervals -1, 0, 1<br>
 *  
 * Thanks to Larry Polansky for suggesting WeightedIntegerSequence.
 * 
 * @author Nick Didkovsky, email: didkovn@mail.rockefeller.edu, (c) 2004 Nick Didkovsky, all rights reserved. 
 *
 */
public class WeightedIntegerToot extends java.applet.Applet implements ActionListener {
	double[] weights = { 1, 1, 1 };
	WeightedIntegerSequence weightedIntegerSequence;
	WeightedMelodyMusicJob job;
	Button startButton;
	Button stopButton;
	Button applyButton;
	ArrayEditorPanel arrayEditorPanel;

	JMSLMixerContainer mixer;

	public void start() {
		JMSLRandom.randomize();
		JMSL.clock.setAdvance(0.1);
		weightedIntegerSequence = new WeightedIntegerSequence(weights);
		job = new WeightedMelodyMusicJob();
		job.setWeightedIntegerSequence(weightedIntegerSequence);
		job.setRepeats(Integer.MAX_VALUE);

		JSynMusicDevice.instance().open();
		JSynInsFromClassName ins = new JSynInsFromClassName(4, "com.softsynth.jsyn.circuits.FilteredSawtoothBL");
		mixer = new JMSLMixerContainer();
		mixer.start();
		mixer.addInstrument(ins);
		job.setInstrument(ins);

		buildGUI();
	}

	void buildGUI() {
		setLayout(new BorderLayout());
		Panel p = new Panel();
		p.setLayout(new GridLayout(0, 1));
		p.add(startButton = new Button("START"));
		p.add(stopButton = new Button("STOP"));
		p.add(applyButton = new Button("APPLY WEIGHTS"));
		add(BorderLayout.NORTH, p);

		arrayEditorPanel = new ArrayEditorPanel();
		arrayEditorPanel.setArray(weightedIntegerSequence.getWeights());
		add(BorderLayout.SOUTH, arrayEditorPanel);
		startButton.addActionListener(this);
		stopButton.addActionListener(this);
		applyButton.addActionListener(this);
	}

	public void stop() {
		removeAll();
		job.finishAll();
		JMSL.closeMusicDevices();
	}

	public void actionPerformed(ActionEvent ev) {
		Object source = ev.getSource();
		if (source == startButton) {
			startButton.setEnabled(false);
			stopButton.setEnabled(true);
			job.launch(JMSL.now());
		}
		if (source == stopButton) {
			stopButton.setEnabled(false);
			startButton.setEnabled(true);
			job.finish();
		}
		if (source == applyButton) {
			arrayEditorPanel.setArrayFromTextFields();
		}

	}
}

class WeightedMelodyMusicJob extends MusicJob {
	WeightedIntegerSequence weightedIntegerSequence;
	double pitch = 60;
	double duration = 0.25;

	public WeightedIntegerSequence getWeightedIntegerSequence() {
		return weightedIntegerSequence;
	}

	public void setWeightedIntegerSequence(WeightedIntegerSequence sequence) {
		weightedIntegerSequence = sequence;
	}

	public double repeat(double playTime) {
		int interval = weightedIntegerSequence.next(); // 0, 1, 2
		int change = interval - 1; // -1, 0, 1
		pitch += change;
		//System.out.println(pitch);
		double[] data = { duration, pitch, 0.6, duration * 0.8 };
		return getInstrument().play(playTime, 1, data);
	}
}