(function () {
	var numberOfPoints = 100;
	var refresh = parseInt($('#refresh').val());
	var incremental = $('#checkbox-incremental').is(':checked') || $('#hidden-incremental').val() == 1;
	var lastIncVal = null;
	var intervalRef = null;
	var currentXHR = null;

	var plot;
	var plotOptions = {
		legend: { container: $("#chartLegend") },
		xaxis: {
			tickFormatter: function (timestamp, axis) {
				var date = new Date(timestamp * 1000);
				
				var server_timezone_offset = get_php_value('timezone_offset');
				var local_timezone_offset = date.getTimezoneOffset()*60*-1;
				
				if (server_timezone_offset != local_timezone_offset) {
					// If timezone of server and client is different, adjust the time to the server
					date = new Date((timestamp + (server_timezone_offset - local_timezone_offset)) * 1000);
				}
				
				var hours = (date.getHours() < 10 ? '0' + date.getHours() : date.getHours());
				var minutes = (date.getMinutes() < 10 ? '0' + date.getMinutes() : date.getMinutes());
				var seconds = (date.getSeconds() < 10 ? '0' + date.getSeconds() : date.getSeconds());
				var formattedTime = hours + ':' + minutes + ':' + seconds;
				return formattedTime;
			}
		},
		yaxis: {
			tickFormatter: function (value, axis) {
				return shortNumber(roundToTwo(value)) ;
			}
		},
		series: {
			lines: {
				lineWidth: 2,
				fill: true
			}
		},
		colors: ['#6db431']
	};

	function updatePlot (data) {
		plot = $.plot($('.graph'), data, plotOptions);
	}

	function requestData () {
		var rel_path = $("#hidden-rel_path").val();

		currentXHR = $.ajax({
			url: rel_path + "extensions/realtime_graphs/ajax.php",
			type: "POST",
			dataType: "json",
			data: {
				graph: $('#graph :selected').val(),
				graph_title: $('#graph :selected').html(),
				snmp_community: $('#text-snmp_community').val(),
				snmp_oid: $('#text-snmp_oid').val(),
				snmp_ver: $('#snmp_version :selected').val(),
				snmp_address: $('#text-ip_target').val(),
				refresh: refresh
			},
			success: function (serie) {
				var timestamp = serie.data[0][0];
				var data = plot.getData();
				
				if (incremental) {
					var currentVal = serie.data[0][1];
					// Try to avoid the first value, cause we need at least two values to get the increment
					serie.data[0][1] = lastIncVal == null ? 0 : currentVal - lastIncVal;
					// Incremental is always positive
					if (serie.data[0][1] < 0) serie.data[0][1] = 0;
					// Store the current value to use it into the next request
					lastIncVal = currentVal;
				}
				
				if (data.length === 0) {
					for (i = 0; i < numberOfPoints; i++) {
						var step = i * (refresh / 1000);
						serie.data.unshift([timestamp - step, 0]);
					}
					
					serie = [serie];
					updatePlot(serie);
					return;
				}

				data[0].label = serie.label;
				if (data[0].data.length >= numberOfPoints) {
					data[0].data.shift();
				}
				
				data[0].data.push(serie.data[0]);
				updatePlot(data);
			}
		});
	}
	
	function startDataPooling () {
		intervalRef = window.setInterval(requestData, refresh);
	}

	function resetDataPooling () {
		if (currentXHR !== null) currentXHR.abort();
		// Stop and start the interval
		window.clearInterval(intervalRef);
		startDataPooling();
	}

	function clearGraph () {
		var data = plot.getData();
		if (data.length === 0) return;

		for (i = 0; i < data[0].data.length; i ++) {
			data[0].data[i][1] = 0;
		}
		if (incremental) lastIncVal = null;
		
		updatePlot(data);

		resetDataPooling();
	}

	// Set the form OID to the value selected in the SNMP browser
	function setOID () {
		if ($('#snmp_browser_version').val() == '3') {
			$('#text-snmp_oid').val($('#table1-0-1').text());
		} else {
			$('#text-snmp_oid').val($('#snmp_selected_oid').text());
		}
		
		// Close the SNMP browser
		$('.ui-dialog-titlebar-close').trigger('click');
	}

	// Show the SNMP browser window
	function snmpBrowserWindow () {
		
		// Keep elements in the form and the SNMP browser synced
		$('#text-target_ip').val($('#text-ip_target').val());
		$('#text-community').val($('#text-snmp_community').val());
		$('#snmp_browser_version').val($('#snmp_version').val());
		$('#snmp3_browser_auth_user').val($('#snmp3_auth_user').val());
		$('#snmp3_browser_security_level').val($('#snmp3_security_level').val());
		$('#snmp3_browser_auth_method').val($('#snmp3_auth_method').val());
		$('#snmp3_browser_auth_pass').val($('#snmp3_auth_pass').val());
		$('#snmp3_browser_privacy_method').val($('#snmp3_privacy_method').val());
		$('#snmp3_browser_privacy_pass').val($('#snmp3_privacy_pass').val());
		
		$("#snmp_browser_container").show().dialog ({
			title: '',
			resizable: true,
			draggable: true,
			modal: true,
			overlay: {
				opacity: 0.5,
				background: "black"
			},
			width: 920,
			height: 500
		});
	}

	function shortNumber (number) {
		if (Math.round(number) != number) return number;
		number = Number.parseInt(number);
		if (Number.isNaN(number)) return number;

		var shorts = ["", "K", "M", "G", "T", "P", "E", "Z", "Y"];
		var pos = 0;

		while (number >= 1000 || number <= -1000) {
			pos++;
			number = number / 1000;
		}

		return number + " " + shorts[pos];
	}
	function roundToTwo(num) {
		return +(Math.round(num + "e+2")  + "e-2");
	}

	$('#graph').change(function() {
		$('form#realgraph').submit();
	});

	$('#refresh').change(function () {
		refresh = parseInt($('#refresh').val());
		resetDataPooling();
	});

	$('#checkbox-incremental').change(function() {
		incremental = $('#checkbox-incremental').is(':checked');
		clearGraph();
	});

	updatePlot([]);
	requestData();
	startDataPooling();

	// Expose this functions
	window.realtimeGraphs = {
		clearGraph: clearGraph,
		setOID: setOID,
		snmpBrowserWindow: snmpBrowserWindow
	}

})();