// Modified from version taken -> https://github.com/juggy/jquery-popover

(function($) {
	$.fn.popover = function(options) {
		var KEY_ESC = 27;
		
		// settings stored options and state
		var settings = $.extend({
			id: '',						// id for created popover
			openEvent: null,	// callback function to be called when popup opened
			closeEvent: null, // callback function to be called when popup closed
			offsetX: 2,				// fixed offset to correct popup X position
			offsetY: 0,				// fixed offset to correct popup Y position
			zindex: 100000,		// default z-index value
			padding: 18,			// default settings.padding around popover from document edges
			closeOnEsc: true, // change to false to disable ESC
			preventLeft: false,		// pass true to prevent left popover
			preventRight: false,	// pass true to prevent right popover
			preventTop: false,		// pass true to prevent top popover
			preventBottom: false, // pass true to prevent bottom popover
			live: false						// popover created on live selector
		}, options || {});
		
		// functions to claculate popover direction and position 
		
		function calcPopoverDirPossible(button, coord) {
			var possibleDir = {
				left: false,
				right: false,
				top: false,
				bottom: false
			}
			
			if (coord.buttonOffset.top + coord.buttonHeight + coord.triangleSize + coord.popoverHeight <= 
									coord.docHeight - settings.padding) {
				possibleDir.bottom = true;
			}

			if (coord.buttonOffset.top - coord.triangleSize - coord.popoverHeight >= settings.padding) {
				possibleDir.top = true;
			}

			if (coord.buttonOffset.left + coord.buttonWidth + coord.triangleSize + coord.popoverWidth <= 
									coord.docWidth - settings.padding) {
				possibleDir.right = true;
			}

			if (coord.buttonOffset.left - coord.triangleSize - coord.popoverWidth >= settings.padding) {
				possibleDir.left = true;
			}
			
			return possibleDir;
		}
		
		function chooseDir(possibleDir) {
			// remove directions prevented by settings
			if (settings.preventBottom)
				possibleDir.bottom = false;
			if (settings.preventTop)
				possibleDir.top = false;
			if (settings.preventLeft)
				possibleDir.left = false;
			if (settings.preventRight)
				possibleDir.right = false;

			// determine default direction if nothing works out
			// make sure it is not one of the prevented directions
			var dir = 'right';
			if (settings.preventRight)
				dir = 'bottom';
			if (settings.preventBottom)
				dir = 'top';
			if (settings.preventTop)
				dir = 'left';

			if (possibleDir.right)
				dir = 'right';
			else if (possibleDir.bottom)
					dir = 'bottom';
			else if (possibleDir.left)
					dir = 'left';
			else if (possibleDir.top)
					dir = 'top';
			
			return dir;
		}
	
		function calcPopoverPos(button) {
			// Set this first for the layout calculations to work.
			settings.popover$.css('display', 'block');
	
			var coord = {
				popoverDir: 'bottom',
				popoverX: 0,
				popoverY: 0,
				deltaX: 0,
				deltaY: 0,
				triangleX: 0,
				triangleY: 0,
				triangleSize: 20, // needs to be updated if triangle changed in css
				docWidth: $(window).width(),
				docHeight: $(window).height(),
				popoverWidth: settings.popover$.outerWidth(),
				popoverHeight: settings.popover$.outerHeight(),
				buttonWidth: button.outerWidth(),
				buttonHeight: button.outerHeight(),
				buttonOffset: button.offset()
			}
			
			// calculate the possible directions based on popover size and button position
			var possibleDir = calcPopoverDirPossible(button, coord);
				
			// choose selected direction
			coord.popoverDir = chooseDir(possibleDir);

			// Calculate popover top
			if (coord.popoverDir == 'bottom')
				coord.popoverY = coord.buttonOffset.top + coord.buttonHeight + coord.triangleSize;
			else if (coord.popoverDir == 'top')
				coord.popoverY = coord.buttonOffset.top - coord.triangleSize - coord.popoverHeight;
			else // same Y for left & right
				coord.popoverY = coord.buttonOffset.top + (coord.buttonHeight - coord.popoverHeight)/2;

			// Calculate popover left
			if ((coord.popoverDir == 'bottom') || (coord.popoverDir == 'top')) {
				
				coord.popoverX = coord.buttonOffset.left + (coord.buttonWidth - coord.popoverWidth)/2;

				if (coord.popoverX < settings.padding) {
					// out of the document at left
					coord.deltaX = coord.popoverX - settings.padding;
				} else if (coord.popoverX + coord.popoverWidth > coord.docWidth - settings.padding) {
					// out of the document right
					coord.deltaX = coord.popoverX + coord.popoverWidth - coord.docWidth + settings.padding;
				}

				// calc triangle pos
				coord.triangleX = coord.popoverWidth/2 - coord.triangleSize + coord.deltaX;				
				coord.triangleY = 0;	
			}
			else {	// left or right direction
				
				if (coord.popoverDir == 'right')
					coord.popoverX = coord.buttonOffset.left + coord.buttonWidth + coord.triangleSize;
				else // left
					coord.popoverX = coord.buttonOffset.left - coord.triangleSize - coord.popoverWidth;
				
				if (coord.popoverY < settings.padding) {
					// out of the document at top
					coord.deltaY = coord.popoverY - settings.padding;
				} else if (coord.popoverY + coord.popoverHeight > coord.docHeight - settings.padding) {
					// out of the document bottom
					coord.deltaY = coord.popoverY + coord.popoverHeight - coord.docHeight + settings.padding;
				}

				// calc triangle pos
				coord.triangleX = 0;
				coord.triangleY = coord.popoverHeight/2 - coord.triangleSize + coord.deltaY;				
			}
	
			return coord;
		}
		
		function positionPopover(coord) {
			// set the triangle class for it's direction
			settings.triangle$.removeClass("left top right bottom");
			settings.triangle$.addClass(coord.popoverDir);

			if (coord.triangleX > 0) {
				settings.triangle$.css('left', coord.triangleX);
			}
			
			if (coord.triangleY > 0) {
				settings.triangle$.css('top', coord.triangleY);
			}

			// position popover
			settings.popover$.offset({
				top: coord.popoverY - coord.deltaY + settings.offsetY,
				left: coord.popoverX - coord.deltaX + settings.offsetX
			});
	
			// set popover css and show it
			settings.popover$.css('z-index', settings.zindex).show();
		}

		// toggle a button popover. If show set to true do not toggle - always show
		function togglePopover(button, show) {
			// if this button popover is already open close it an return
			if ($.fn.popover.openedPopup && 
				($.fn.popover.openedPopup.get(0) === button.get(0))) {
				if (!show)
					hideOpenPopover();
				return;
			}
	
			// hide any open popover
			hideOpenPopover();
	
			// clicking triangle will also close the popover
			settings.triangle$.click(function() {
				button.trigger('hidePopover') 
			});
	
			// reset triangle
			settings.triangle$.attr("style", "");
	
			// calculate all the coordinates needed for positioning the popover and position it 
			positionPopover(calcPopoverPos(button));

			//Timeout for webkit transitions to take effect
			setTimeout(function() {
				settings.popover$.addClass("active");
			}, 0);
	
			if ($.isFunction(settings.openEvent)) {
				settings.openEvent(button);
			}
				
			$.fn.popover.openedPopup = button;
			button.addClass('popover-on');
			$(document).trigger('popoverOpened');
		}
	
		// hide a button popover
		function hidePopover(button) {
			button.removeClass('popover-on');
			$(document).trigger('popoverClosed');
			settings.popover$.removeClass("active").attr("style", "").hide();
			if ($.isFunction(settings.closeEvent)) {
				settings.closeEvent(button);
			}
			$.fn.popover.openedPopup = null;			
		}
		
		// hide the currently open popover if there is one
		function hideOpenPopover() {
			if ($.fn.popover.openedPopup != null)
				$.fn.popover.openedPopup.trigger('hidePopover');			
		}
	
		// build HTML popover
		settings.popover$ = $('<div class="popover" id="' + settings.id + '">'
					+ '<div class="triangle"></div>'
					+ '<div class="header"></div>'
					+ '<div class="content"></div>'
					+ '</div>').appendTo('body');
		$('.header', settings.popover$).append($(settings.header).detach());
		$('.content', settings.popover$).append($(settings.content).detach());

		settings.triangle$ = $('.triangle', settings.popover$);

		// remember last opened popup
		$.fn.popover.openedPopup = null;	

		// setup global document bindings
		$(document).unbind(".popover");

		// document click closes active popover		
		$(document).bind("click.popover", function(event) {
			if (($(event.target).parents(".popover").length == 0)
					&& (!$(event.target).hasClass('popover-button'))) {
				hideOpenPopover();
			}
		});
	
		// document hidePopover event causes active popover to close
		$(document).bind("hideOpenPopover.popover", hideOpenPopover);
		
		// document Esc key listener
		var selector = this;
		if (settings.closeOnEsc) {
			$(document).bind('keydown', function(event) {
				if (!event.altKey && !event.ctrlKey && !event.shiftKey
							&& (event.keyCode == KEY_ESC)) {
					selector.trigger('hidePopover');
				}
			});
		}		

		// setup callbacks for each popover button in wrapped set & return wrapped set
		if (!settings.live) {
			return this.each(function() {
				var button = $(this);
				button.addClass("popover-button");

				button.bind('click', function() { 
					togglePopover(button);
					return false;
				});

				button.bind('showPopover', function() { 
					togglePopover(button, true);
					return false;
				});

				button.bind('hidePopover', function() {
					hidePopover(button);
					return false;
				});
			});
		}
		else { // live popover		
			this.live('click', function(event) {
				$(event.target).addClass("popover-button");
				togglePopover($(event.target));
				return false;
			});

			this.live('showPopover', function(event) { 
				$(event.target).addClass("popover-button");
				togglePopover($(event.target), true);
				return false;
			});

			this.live('hidePopover', function(event) {
				hidePopover($(event.target));
				return false;
			});
			
			return this;		
		}
	};
})(jQuery);