document.pois = null;
document.database = null;
document.playedItems = [];

$.ajaxSetup({ cache: false });

$(document).ready(function() {
	this.database = new DB();
	
	// From: http://kolber.github.io/audiojs/
	audiojs.events.ready(function() {
		var as = audiojs.createAll();
	});
	
	$('body').on('databaseLoaded', function(e, datasets) {
		//console.debug('database loaded', document.database);
		if(document.database)
		{
			$.ajaxSetup({ cache: true });
			$('#routes').find('option').remove().end();
			for(var trackNr in document.database) {
				$('#routes').append($('<option value="'+trackNr+'">'+document.database[trackNr]['name']+'</option>'));
			}
			trackChanged($('#routes').val());
			
			geoLocation.startWatcher();
		}
	});

	$('body').on('geoLocationGot', function(e,data) {
		var nearest = {poi: null, range:null};
		
		$('#dump').html(data.position.latitude+', '+data.position.longitude+'('+data.position.accuracy+'m)<br />'+Date(data.timestamp));
		console.debug('update distances from current Position');
		if ($('#routes').val() == '') {
			console.debug('no track selected - abording');
			return;
		}
		
		for(var index in document.pois)
		{
			var dist = Math.round(geoLocation.distance(
				{
					'latitude':document.pois[index].lat,
					'longitude':document.pois[index].lon
				}
			));
//			console.debug(index, document.playedItems, document.playedItems.indexOf(index) == -1)
			if (nearest.desc !== null && document.playedItems.indexOf(index) == -1 && (nearest.range === null || nearest.range > dist)) {
				nearest = {poi:index, range: dist};
			}
			
			$('#trackDump .poi_'+index).text(document.pois[index].desc + ' (' + dist + 'm)');
			//console.debug(document.pois[index].desc + ' (' + dist + 'm)');
		}
		
			
		document.playedItems.push(nearest.poi);
		console.debug(nearest);
		
		if (nearest.range < 2000) {
			vibrate.start(vibrate.patterns.alarm);
			$('#poiViews div').removeClass('active');
			$('.poi_'+nearest.poi).addClass('active');
			nearest.data = document.database[$('#routes').val()].pois[nearest.poi];
		}
	});
	
	$('body').on('geoLocationError',function(e) {
		console.debug('geolocation error', e.message);
		geoLocation.getPosFromServer();
   });
	
	$('body').on('click', function(e) {
		console.debug('show context menu');
		
		if($('#contextMenu').is(':hidden')) $('#contextMenu').css('top',(e.pageY-5)+'px').css('left',(e.pageX-15)+'px');
		toggle('#contextMenu');
	});


});

var trackChanged = function(idx) {
	console.debug('changed track to', idx);
	document.pois = null;
	document.playedItems = [];
	$('#trackDump').html();
//	console.debug(document.database[idx].pois);
	if(idx != '')
	{
		document.pois = document.database[idx].pois;
		
		for(var index in document.pois) {
			var elem = document.database[idx].pois[index];
			if(elem.desc != null)
			{
				$('#trackDump').append('<li class="poi_'+index+'">'+elem.desc+'</li>');
				var poi = $('<div class="poi_'+index+'"></div>');
				$(poi).append('<h2>'+elem.desc+'</h2>');
				$(poi).append($('<input type="image" src="img/play.png" data-audio="'+elem.audio+'" />').on('click', function(e) {playAudio(this.dataset.audio, e)}));
				$(poi).append('<p class="text">'+elem.text+'</p>')
				$('#poiViews').append(poi);
				
			}
			//else $('#trackDump').append('<li id="poi_'+index+'">'+index+'</li>');
		}
		$('#poiViews div:first-child').addClass('active');
	}
}

var playAudio = function(track, e) {
	track = 'audio/'+('0000'+(''+track).replace('/[^\d]/','')).substr(-4)+'.m4a';
	console.debug('play audio',''+track);
	
	// FROM: http://9elements.com/html5demos/audio/
	
	var audioElement = $('#audio audio');
	// Audioelement erstellen
	if(audioElement.length == 0) {
		console.debug('create new AudioElement')
		audioElement = new Audio("");
		audioElement.controls = 'controls';
		
		// im DOM einfügen, sonst wird es nicht abgespielt
		$('#audio').append(audioElement);
	
		// erst abspielen wenn genug vom mp3 geladen wurde
		audioElement.addEventListener('canplay', function() {
			audioElement.play();
			$('#poiViews .active input').attr('src', 'img/stop.png').off('click').on('click', stopAudio);
			$('#contextMenu #contextPlay').text('Ansage stoppen');
		}, false);
		
		audioElement.addEventListener('ended', function() {
			$('#poiViews .active input').attr('src', 'img/play.png').off('click').on('click',  function(e) {playAudio(this.dataset.audio, e)});
			$('#contextMenu #contextPlay').text('Ansage abspielen');
		}, false);
	}
	else
	{
		audioElement = audioElement[0];		//convert from jQuery Object
	}
	
	audioElement.src = track;
	audioElement.load();
	audioElement.play();
	e.stopPropagation();
}

var stopAudio = function(e)
{
	var audioElement = $('#audio audio')[0];
	console.debug('stop audio', audioElement);

	audioElement.pause();
//	audioElement.currentTime = 0;
	$('#poiViews .active input').attr('src', 'img/play.png').off('click').on('click',  function() {playAudio(this.dataset.audio)});
	$('#contextMenu #contextPlay').text('Ansage abspielen');
	e.stopPropagation();
}

var show = function(obj) {
	if($(obj).is(':hidden')) {$(obj).slideDown({duration: 500});}
}

var hide = function(object) {
	if($(obj).is(':not(hidden)')) {$(obj).slideUp({duration: 500});}
}

var toggle = function(obj)
{
	if($(obj).is(':hidden'))	{$(obj).slideDown({duration: 500});}
	else						{$(obj).slideUp({duration: 500});}
}

/********* Context-Menü der Seite ***********************************************************************/

$('#contextMenu').on('click', function(e) {
	$(this).css('display', 'none');
	e.stopPropagation();
});

$('#contextMenu #contextReload').on('click', function(e) {
	window.location.reload(true);
});

$('#contextMenu #contextPlay').on('click', function(e) {
	$('#poiViews .active input').trigger('click', e);
})