/*************************************************************************
 *  Compilation:  javac PlayThatTune.java
 *  Execution:    java PlayThatTune < data.txt
 *  Dependencies: StandardLib, found at http://introcs.cs.princeton.edu/java/stdlib/stdlib.jar
 *
 *  % java PlayThatTune < testaudio.txt
 *
 *
 *  Make sure amplitudes for each line add up to exactly 1
 *  Make sure lengths for each note on the same line are the same #
 *  Data files format:
 *
 *  note length amplitude note length amplitude...
 *  1    .5      .1         5    .5     .9
 * 
 *  
 *
 *************************************************************************/

public class PlayThatTune
{
	public static double[] sum(double[] a, double[] b,
									double awt, double bwt)
	{ // superpose a and b, weighted.
		double[] c = new double[a.length];
		assert (a.length == b.length);
		for (int i = 0; i < a.length; i++)
			c[i] = a[i]*awt + b[i]*bwt;
		return c;
	}
	
	public static double[] tone(double hz, double duration, double amplitude)
	{ 
		int N = (int) (StdAudio.SAMPLE_RATE * duration);
		double[] a = new double[N+1];
			for (int i = 0; i <= N; i++) {
			a[i] = amplitude * Math.sin(2 * Math.PI * i * hz / StdAudio.SAMPLE_RATE);
		}
		return a; 
	} 

	public static double[] note(int p, double t, double amplitude)
	{ //Play note p, with harmonics.
		double hz = 440.0 * Math.pow(2, p/12.0);
		double[] a = tone(hz, t, amplitude);
		double[] hi = tone(2*hz, t, amplitude);
		double[] lo = tone(hz/2, t, amplitude);
		double[] h = sum(hi, lo, .5, .5);
		return sum(a, h , .5, .5);
	}

	public static void playmore(int iter, double[] bj, String[] z)
	{
		//iterate with int iter backwards through z
		int pitch = Integer.parseInt(z[(iter*3)-3]);
		double duration = Double.parseDouble(z[(iter*3)-2]);
		double amplitude = Double.parseDouble(z[(iter*3)-1]);
		//Check amplitude value
		assert (amplitude < 1 && amplitude > 0);
		double[] a = note(pitch, duration, amplitude);
		System.out.println(a.length + " is a[]");
		System.out.println(bj.length + " is bj[]");
		iter -= 1;
		for (int i = a.length-1; i >= 0; i--)
		{
			//iterate over a[] backwards, adding a[i] to bj[i]
			//System.out.println("yes"+i);
			bj[i] = (bj[i] + a[i]);
		}
		if (iter == 0)
		{
			StdAudio.play(bj);
		}
		else
		{
			playmore(iter, bj, z);
		}
	}

	public static void play()
	{
		String[] z = StdIn.readLine().split(" ");
		int zphi = z.length;
		if (zphi == 1) return;
		if (zphi > 3)
		{
			System.out.println(zphi);
			double duration = Double.parseDouble(z[1]);
			int N = (int) (StdAudio.SAMPLE_RATE * duration);
			double[] bj = new double[N+1];
			playmore((zphi)/3, bj, z);
			return;
		}
		for (int i = 0; i <= z.length-1; i++)
		{
			System.out.println(z[i]);
		}
		int pitch = Integer.parseInt(z[0]);
		double duration = Double.parseDouble(z[1]);
		double[] a = note(pitch, duration, 1);
		//System.out.println(a.length-1);
		StdAudio.play(a);
	}

	public static void main(String[] args)
	{ //Read and play a tune with harmonics
		while (!StdIn.isEmpty())
		{ // Read and play a note with harmonics.
			play();
		}
	}
}