(function($) {

	$.extend(mejs.MepDefaults, {
		muteText: mejs.i18n.t('Mute Toggle'),
		hideVolumeOnTouchDevices: true,
		
		audioVolume: 'horizontal',
		videoVolume: 'vertical'
	});

	$.extend(MediaElementPlayer.prototype, {
		buildvolume: function(player, controls, layers, media) {
				
			// Android and iOS don't support volume controls
			if ((mejs.MediaFeatures.isAndroid || mejs.MediaFeatures.isiOS) && this.options.hideVolumeOnTouchDevices)
				return;
			
			var t = this,
				mode = (t.isVideo) ? t.options.videoVolume : t.options.audioVolume,
				mute = (mode == 'horizontal') ?
				
				// horizontal version
				$('<div class="mejs-button mejs-volume-button mejs-mute">'+
					'<button type="button" aria-controls="' + t.id + '" title="' + t.options.muteText + '" aria-label="' + t.options.muteText + '"></button>'+
				'</div>' +
				'<div class="mejs-horizontal-volume-slider">'+ // outer background
					'<div class="mejs-horizontal-volume-total"></div>'+ // line background
					'<div class="mejs-horizontal-volume-current"></div>'+ // current volume
					'<div class="mejs-horizontal-volume-handle"></div>'+ // handle
				'</div>'
				)
					.appendTo(controls) :
				
				// vertical version
				$('<div class="mejs-button mejs-volume-button mejs-mute">'+
					'<button type="button" aria-controls="' + t.id + '" title="' + t.options.muteText + '" aria-label="' + t.options.muteText + '"></button>'+
					'<div class="mejs-volume-slider">'+ // outer background
						'<div class="mejs-volume-total"></div>'+ // line background
						'<div class="mejs-volume-current"></div>'+ // current volume
						'<div class="mejs-volume-handle"></div>'+ // handle
					'</div>'+
				'</div>')
					.appendTo(controls),
			volumeSlider = t.container.find('.mejs-volume-slider, .mejs-horizontal-volume-slider'),
			volumeTotal = t.container.find('.mejs-volume-total, .mejs-horizontal-volume-total'),
			volumeCurrent = t.container.find('.mejs-volume-current, .mejs-horizontal-volume-current'),
			volumeHandle = t.container.find('.mejs-volume-handle, .mejs-horizontal-volume-handle'),

			positionVolumeHandle = function(volume, secondTry) {

				if (!volumeSlider.is(':visible') && typeof secondTry == 'undefined') {
					volumeSlider.show();
					positionVolumeHandle(volume, true);
					volumeSlider.hide()
					return;
				}
			
				// correct to 0-1
				volume = Math.max(0,volume);
				volume = Math.min(volume,1);					
				
				// ajust mute button style
				if (volume == 0) {
					mute.removeClass('mejs-mute').addClass('mejs-unmute');
				} else {
					mute.removeClass('mejs-unmute').addClass('mejs-mute');
				}				

				// position slider 
				if (mode == 'vertical') {
					var 
					
						// height of the full size volume slider background
						totalHeight = volumeTotal.height(),
						
						// top/left of full size volume slider background
						totalPosition = volumeTotal.position(),
						
						// the new top position based on the current volume
						// 70% volume on 100px height == top:30px
						newTop = totalHeight - (totalHeight * volume);
	
					// handle
					volumeHandle.css('top', Math.round(totalPosition.top + newTop - (volumeHandle.height() / 2)));
	
					// show the current visibility
					volumeCurrent.height(totalHeight - newTop );
					volumeCurrent.css('top', totalPosition.top + newTop);
				} else {
					var 
					
						// height of the full size volume slider background
						totalWidth = volumeTotal.width(),
						
						// top/left of full size volume slider background
						totalPosition = volumeTotal.position(),
						
						// the new left position based on the current volume
						newLeft = totalWidth * volume;
	
					// handle
					volumeHandle.css('left', Math.round(totalPosition.left + newLeft - (volumeHandle.width() / 2)));
	
					// rezize the current part of the volume bar
					volumeCurrent.width( Math.round(newLeft) );
				}
			},
			handleVolumeMove = function(e) {
				
				var volume = null,
					totalOffset = volumeTotal.offset();
				
				// calculate the new volume based on the moust position
				if (mode == 'vertical') {
				
					var
						railHeight = volumeTotal.height(),
						totalTop = parseInt(volumeTotal.css('top').replace(/px/,''),10),
						newY = e.pageY - totalOffset.top;
						
					volume = (railHeight - newY) / railHeight;
						
					// the controls just hide themselves (usually when mouse moves too far up)
					if (totalOffset.top == 0 || totalOffset.left == 0)
						return;
					
				} else {
					var
						railWidth = volumeTotal.width(),
						newX = e.pageX - totalOffset.left;
						
					volume = newX / railWidth;
				}
				
				// ensure the volume isn't outside 0-1
				volume = Math.max(0,volume);
				volume = Math.min(volume,1);
				
				// position the slider and handle			
				positionVolumeHandle(volume);
				
				// set the media object (this will trigger the volumechanged event)
				if (volume == 0) {
					media.setMuted(true);
				} else {
					media.setMuted(false);
				}
				media.setVolume(volume);			
			},
			mouseIsDown = false,
			mouseIsOver = false;

			// SLIDER
			
			mute
				.hover(function() {
					volumeSlider.show();
					mouseIsOver = true;
				}, function() {
					mouseIsOver = false;	
						
					if (!mouseIsDown && mode == 'vertical')	{
						volumeSlider.hide();
					}
				});
			
			volumeSlider
				.bind('mouseover', function() {
					mouseIsOver = true;	
				})
				.bind('mousedown', function (e) {
					handleVolumeMove(e);
					t.globalBind('mousemove.vol', function(e) {
						handleVolumeMove(e);
					});
					t.globalBind('mouseup.vol', function () {
						mouseIsDown = false;
						t.globalUnbind('.vol');

						if (!mouseIsOver && mode == 'vertical') {
							volumeSlider.hide();
						}
					});
					mouseIsDown = true;
						
					return false;
				});


			// MUTE button
			mute.find('button').click(function() {
				media.setMuted( !media.muted );
			});

			// listen for volume change events from other sources
			media.addEventListener('volumechange', function(e) {
				if (!mouseIsDown) {
					if (media.muted) {
						positionVolumeHandle(0);
						mute.removeClass('mejs-mute').addClass('mejs-unmute');
					} else {
						positionVolumeHandle(media.volume);
						mute.removeClass('mejs-unmute').addClass('mejs-mute');
					}
				}
			}, false);

			if (t.container.is(':visible')) {
				// set initial volume
				positionVolumeHandle(player.options.startVolume);

				// mutes the media and sets the volume icon muted if the initial volume is set to 0
        if (player.options.startVolume === 0) {
          media.setMuted(true);
        }

				// shim gets the startvolume as a parameter, but we have to set it on the native <video> and <audio> elements
				if (media.pluginType === 'native') {
					media.setVolume(player.options.startVolume);
				}
			}
		}
	});
	
})(mejs.$);
