var socket;
var audioCtx = new window.AudioContext();
var source = audioCtx.createBufferSource();
var total_raw;

function appendBuffer(buffer1, buffer2) {
	let numberOfChannels = Math.min( buffer1.numberOfChannels, buffer2.numberOfChannels );
	let tmp = audioCtx.createBuffer( numberOfChannels, (buffer1.length + buffer2.length), buffer1.sampleRate );
	for (let i=0; i<numberOfChannels; i++) {
		let channel = tmp.getChannelData(i);
		channel.set( buffer1.getChannelData(i), 0);
		channel.set( buffer2.getChannelData(i), buffer1.length);
	}
	return tmp;
}

function appendBuffer2(buffer1, buffer2) {
	var tmp = new Uint8Array(buffer1.byteLength + buffer2.byteLength);
	var buff1 = new Uint8Array(buffer1);
	var buff2 = new Uint8Array(buffer2);
	tmp.set(buff1, 0);
	tmp.set(buff2, buffer1.byteLength);
	return tmp.buffer;
};

function load() {
	socket = init_websocket();
}

/* Websocket setup */
function init_websocket() {
	let socket = new WebSocket('wss://' + window.location.hostname + ws_uri);
	socket.binaryType = "arraybuffer";
	socket.onmessage = onmessage;
	socket.onclose = onclose;
	socket.onerror = onerror;
	socket.events = {};
	return socket;
}

function onmessage (e) {
	console.log(e);
	if (e.data.constructor === ArrayBuffer) {
		console.log(e.data.byteLength);
		if (source.buffer != null) {
			total_raw = appendBuffer2(total_raw, e.data);
		} else {
			total_raw = e.data;
		}
		audioCtx.decodeAudioData(total_raw.slice(0)).then(function(decodedBuffer) {
			if (source.buffer != null) {
				source.stop();
			}
			source = audioCtx.createBufferSource();
			source.buffer = decodedBuffer;
			source.connect(audioCtx.destination);
			source.start(0, audioCtx.currentTime);
		});
	}
}

function onclose(e) {
	if (e.wasClean) { return; } // no need to reconnect
	console.log(e);
	console.log('Websocket lost connection to server. Re-trying...');
	//socket = init_websocket();
	//await sleep(5000);
}

function onerror(e) {
	console.log("Websocket error!")
	console.log(e);
}