// CCTV Control 
// 
// Author: 	Florian Raemisch
// Email: 	olf@subsignal.org
//
// cctv-control is a webinterface to control and view 
// mjpeg encoded videos by cctv cameras which are
// proxied by mjpegplexer. camera control is possible
// with arrow-keys, if mjpegplexer is configured 
// properly.
//
// This Software is licensed under the GPL Version 3, 29 June 2007


var cam = 0;
var camHost = "127.0.0.1:8080";
var controlHost = "127.0.0.1:8080";

//create event which is triggered when DOM is ready 
window.onDomReady = initReady;

//change from testbild to default cam when DOM is ready
window.onDomReady(changeCam);

function initReady(fn)	{
	if(document.addEventListener) {
		document.addEventListener("DOMContentLoaded", fn, false);
	}
}

//change currently displayed camera to the one in cam variable
function changeCam()	{
	var display = document.getElementById('screen');
	if (cam <= 7 && cam >= 0)	{
			camDisplay = cam + 1;
			display.innerHTML = '<p class="camnumber">' + camDisplay + '</p>';
			display.innerHTML += '<img src="http://' + camHost + '/cam/' + cam + '/stream.mjpeg" />';
	}
	else	{
			display.innerHTML = '<img src="img/testbild.png" />';
	}
}

//send control command to currently selected camera
function controlCam(direction)	{
	if (direction == "left" || direction == "right" || direction == "up" || direction == "down")	{
		var request = new XMLHttpRequest();
		request.open("get", "http://" + controlHost + "/cam/" + cam + "/control/" + direction, false);
		request.send();
		return false;
	}
}

function keyDown(event)	{

	switch(event.keyCode)	{
		case 49: // 1
			cam =  0;
			changeCam();
			break;
		case 50: // 2
			cam =  1;
			changeCam();
			break;
		case 51: // 3
			cam =  2;
			changeCam();
			break;
		case 52: // 4
			cam =  3;
			changeCam();
			break;
		case 53: // 5
			cam =  4;
			changeCam();
			break;
		case 54: // 6
			cam =  5;
			changeCam();
			break;
		case 55: // 7
			cam =  6;
			changeCam();
			break;
		case 56: // 8
			cam =  7;
			changeCam();
			break;
		case 37: // arrow left
			controlCam("left");
			break;
		case 38: // arrow up
			controlCam("up");
			break;
		case 39: // arrow right
			controlCam("right");
			break;
		case 40: // arrow down
			controlCam("down");
			break;
		}
}