package kha.java;

import java.lang.Runnable;

@:classCode('
	java.io.File file;
	javax.sound.sampled.AudioInputStream in;
	javax.sound.sampled.SourceDataLine line;
	int frameSize;
	byte[] buffer = new byte [32 * 1024]; // 32k is arbitrary
	Thread playThread;
	boolean playing;
	boolean notYetEOF;
')
class Music implements Runnable {
	var loop: Bool = false;

	public function new(filename: String) {
		init(filename);
	}

	@:functionCode('
		try {
			//instance = this;
			java.io.File f = new java.io.File(filename);
			file = f;
			in = javax.sound.sampled.AudioSystem.getAudioInputStream (f);
			javax.sound.sampled.AudioFormat format = in.getFormat();
			javax.sound.sampled.AudioFormat.Encoding formatEncoding = format.getEncoding();
			if (!(formatEncoding.equals(javax.sound.sampled.AudioFormat.Encoding.PCM_SIGNED) || formatEncoding.equals(javax.sound.sampled.AudioFormat.Encoding.PCM_UNSIGNED)))
			   throw new javax.sound.sampled.UnsupportedAudioFileException(file.getName() + " is not PCM audio");
		   //System.out.println ("got PCM format");
		   frameSize = format.getFrameSize();
		   javax.sound.sampled.DataLine.Info info = new javax.sound.sampled.DataLine.Info(javax.sound.sampled.SourceDataLine.class, format);
		   //System.out.println ("got info");
		   line = (javax.sound.sampled.SourceDataLine)javax.sound.sampled.AudioSystem.getLine(info);
		   //System.out.println ("got line");
		   line.open();
		   //System.out.println ("opened line");
		   playThread = new Thread(this);
		   playing = false;
		   notYetEOF = true;
		}
		catch (Exception ex) {
			ex.printStackTrace();
		}
	')
	function init(filename: String): Void {}

	@:functionCode('
		int readPoint = 0;
		int bytesRead = 0;

		try {
			while (playing) {
				while (notYetEOF) {
					if (playing) {
						bytesRead = in.read(buffer, readPoint, buffer.length - readPoint);
						if (bytesRead == -1) {
							notYetEOF = false;
							break;
						}
						// how many frames did we get,
						// and how many are left over?
						//int frames = bytesRead / frameSize;
						int leftover = bytesRead % frameSize;
						// send to line
						line.write(buffer, readPoint, bytesRead-leftover);
						// save the leftover bytes
						System.arraycopy(buffer, bytesRead, buffer, 0, leftover);
	                    readPoint = leftover;
					}
					else {
						// if not playing
						// Thread.yield();
						try { Thread.sleep (10);}
						catch (InterruptedException ie) {}
					}
				}
				//System.out.println ("reached eof");
				try {
					in = javax.sound.sampled.AudioSystem.getAudioInputStream(file);
				}
				catch (javax.sound.sampled.UnsupportedAudioFileException e) {
					e.printStackTrace();
				}
				if (loop) notYetEOF = true;
				else playing = false;
			}
			line.drain();
			line.stop();
		}
		catch (java.io.IOException ioe) {
			ioe.printStackTrace();
		}
		finally {
			// line.close();
		}
	')
	public function run(): Void {}

	@:functionCode('
		this.loop = loop;
		playing = true;
		if (!playThread.isAlive())
			playThread.start();
		line.start();
	')
	function play2(loop: Bool): Void {}

	public function play(loop: Bool = false): Void {
		play2(loop);
	}

	@:functionCode('
		playing = false;
		line.stop();
	')
	public function stop(): Void {}
}