import java.io.DataOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

import lejos.nxt.Button;
import lejos.nxt.LCD;
import lejos.nxt.SensorPort;
import lejos.nxt.Sound;
import lejos.nxt.SoundSensor;

public class ClapDetector {
	private final static int SAMPLING_RATE = 25;
	private final static int CLAP_THRESHOLD = 60;
	private final static int SILENCE_THRESHOLD = 40;

	private final static boolean STRICT_CLAP = false;

	public static void main(String[] args) throws Exception {
		SoundSensor sound = new SoundSensor(SensorPort.S4);

		File f = new File("recording.txt");

		if (!f.exists()) {
			if (!f.createNewFile()) {
				LCD.drawString("File creation problem", 0, 0);
				LCD.refresh();
				while (!Button.ENTER.isPressed())
					;
			}
		}

		FileOutputStream fs = new FileOutputStream(f);
		DataOutputStream dos = new DataOutputStream(fs);

		LCD.drawString("Loudness: ", 0, 0);

		int value;
		int clapState = -1;

		String equalizeSymbol = "=";
		String clearSymbol = " ";
		String separatorSymbol = ",";
		String eolSymbol = "\r\n";

		int startTime = (int) System.currentTimeMillis();
		try {
			while (!Button.ESCAPE.isPressed()) {
				value = sound.readValue();
				LCD.drawInt(value, 4, 10, 0);
				LCD.refresh();
				writeString(Integer.toString((int)System.currentTimeMillis()
						- startTime), dos);
				writeString(separatorSymbol, dos);
				writeString(Integer.toString(value), dos);
				writeString(eolSymbol, dos);

				for (int i = 0; i < 17; i++)
					LCD.drawString((value / 10 < i) ? clearSymbol
							: equalizeSymbol, i, 3);

				LCD.drawInt(0, clapState + 1, 5);
				LCD.drawInt((int) (Runtime.getRuntime().freeMemory()), 0, 7);
				LCD.refresh();

				if (clapState == -1) {
					if (value > CLAP_THRESHOLD)
						clapState = 10;
				} else if (clapState == 0) {
					// Sound.buzz();
					LCD.clear();
					LCD.refresh();
					clapState = -1;
				} else {
					if ((STRICT_CLAP) && (value > SILENCE_THRESHOLD))
						clapState = -1;
					else
						clapState--;
				}

				Thread.sleep(SAMPLING_RATE);
			}
		} catch (IOException e) {
		} finally {
			dos.flush();
			dos.close();
		}

		LCD.clear();
		LCD.drawString("Program stopped", 0, 0);
		LCD.refresh();

	}

	private static void writeString(String str, DataOutputStream output)
			throws IOException {
		for (int i = 0; i < str.length(); i++)
			output.write(str.charAt(i) + 0);
	}
}