/*
 * OrbitalTooltip jQuery Plugin (http://www.userfirstinteractive.com/)
 * @author Scott D. Brooks 
 * @created by UserFirst Interactive (creations@userfirstinteractive.com)
 * 
 * @version 0.1
 * 
 * @changelog
 * v 0.1 	->	Starting release [Nov. 26, 2008]
 * 
 */
(function(jQuery) {
	
	// Decalre important math functions
	Math.cot = function(x) { return 1 / Math.tan(x); }
	
	function degrees_to_radians(deg) {
    	return deg * (Math.PI/180);
	}
	
	function radians_to_degrees(rad) {
    	return rad * (180/Math.PI);
	}	

	// calculates the size of the opposite side
	function calculate_opposite_side(adjacent, degrees) {
		return Math.round(Math.tan(degrees_to_radians(degrees)) * adjacent);
	}
	
	// calculates the size of the adjacent side
	function calculate_adjacent_side(opposite, degrees) {
		return Math.round(Math.cot(degrees_to_radians(degrees)) * opposite);
	}
	
	function calculate_degrees_from_sides(adjacent, opposite) {
		return radians_to_degrees(Math.atan(opposite / adjacent));
	}
	// End Math functions
	
    jQuery.extend({
        orbitaltooltip: {
            version: 0.1,
            defaults: {
	        	orbitalPosition: 	180,								// the tooltip's position in degrees from the center of the object (0 or 360 degrees being top, 90 right, 180 bottom, 270 left... and everything in between).
	        	tooltipClass: 		'orbitaltooltip-default-bottom',	// class for the tooltip
	        	spacing: 			5,									// spacing from the edge of the object requesting a tooltip
	        	offset: 			0, 									// depending on the side of display, move the tooltip closer or further from the top left (so -10 would move the tooltip closer to the left when displayed on top or bottom)
	        	html:				'<p>sample text</p>',				// HTML within the tooltip
	        	revealStyle: 		'fade',  							// not currently in use
	        	orbit:				false,  							// not currently in use
	        	orbitInterval:		500  								// not currently in use
            }
        }
    });
    
    jQuery.fn.extend({
        orbitaltooltip: function(options) {
            var options 		= jQuery.extend({}, jQuery.orbitaltooltip.defaults, options);
            var orbTooltip 		= this;
            var uniqueID 		= 'orbialtTip_' + this.attr("id");
            
            // add divs for each item            
            jQuery("body").append(jQuery(document.createElement('div')).html(options.html).addClass(options.tooltipClass).attr("id",uniqueID).css("display","none"));
            
            // skip initial position calc. if they are choosing to have the tooltip orbit
        	if (options.orbit != true) {
        		var tooltipPosition = calculatePosition(orbTooltip, jQuery("#" + uniqueID), options.orbitalPosition, options.spacing, options.offset);
        	}
        	
        	var fly_orbit = false;
            return this.hover(
                function(e) {
                	if (options.orbit == true) {
                		/*  Causing lock-up at the moment.  Will investigate further at a later date
                		var position = options.orbitalPosition;
                		fly_orbit = true;
                		while (fly_orbit) {
                			position = position + 1;
                			if (position > 360) { position = 1; }
                			tooltipPosition = calculatePosition(orbTooltip, jQuery("#" + uniqueID), position, options.spacing);
                			setTimeout("move_along_orbit(jQuery('#' + uniqueID), tooltipPosition)", options.orbitInterval);
                		}
                		*/
                		alert('orbiting functionality is not currently functioning');
                  	} else {
                		position(jQuery("#" + uniqueID), tooltipPosition[0], tooltipPosition[1]);
                	}
                },
                function(e) {
					// off hover
					fly_orbit = false;
					hideTooltip(jQuery("#" + uniqueID));
                }
            );
        }
    });
    
	function move_along_orbit(tooltip, tooltipPosition)
	{	
		tooltip.fadeOut(50);
		tooltip.css("position","absolute");
		tooltip.css("top",tooltipPosition[1]);
		tooltip.css("left",tooltipPosition[0]);
		tooltip.fadeIn(50);		
	}

	function position_top(element_to_add_tooltip, tooltip, spacing)
	{	
		// var element_width = element_to_add_tooltip.width() + get_horizontal_padding(element_to_add_tooltip);
		// var element_height = element_to_add_tooltip.height() + get_vertical_padding(element_to_add_tooltip);
	
		var tooltip_width = tooltip.width();
		var tooltip_height = tooltip.height();

		var coordinates = element_to_add_tooltip.offset()
		var x = coordinates.left + ((element_width / 2) - (tooltip_width / 2));
		var y = coordinates.top - tooltip_height;
		
		position(tooltip, x, y);
	}
	
	function get_vertical_padding(element)
	{	
		var vertical_padding = parseInt(element.css('padding-top')) + parseInt(element.css('padding-bottom'));
		vertical_padding = vertical_padding + parseInt(element.css('border-top-width')) + parseInt(element.css('border-bottom-width'));
		
		return vertical_padding;
	}
	
	
	function get_horizontal_padding(element)
	{	
		var horizontal_padding = parseInt(element.css('padding-right')) + parseInt(element.css('padding-left'));
		horizontal_padding = horizontal_padding + parseInt(element.css('border-right-width')) + parseInt(element.css('border-left-width'));
		
		return horizontal_padding;
	}
	
	function calculatePosition(element_to_add_tooltip, tooltip, orbitalPosition, spacing, offset)
	{
		var position = new Array();		// x=[0], y=[1]
				
		var element_center = get_element_center_coordinates(element_to_add_tooltip);
		var tooltip_center = get_element_center_coordinates(tooltip);
		
		// error checking on degrees
		if (orbitalPosition > 360 || orbitalPosition < 0 ) {
			alert('You have misconfigured your orbitalTooltip - please choose from an orbit between 0-360 degrees for the object: #' + orbitalTooltip.attr("id"));
			position[0] = 0;
			position[1] = 0;
			return position;
		}
		
		var adjacent = element_to_add_tooltip.height() / 2;
		var opposite = element_to_add_tooltip.width() / 2;
		
		var angle_to_corner = calculate_degrees_from_sides(adjacent, opposite);
				
		var topleft_indegrees = Math.round(360 - angle_to_corner);
		var topright_indegrees = Math.round(angle_to_corner);
		var bottomright_indegrees = Math.round(180 - angle_to_corner);
		var bottomleft_indegrees = Math.round(180 + angle_to_corner);

		switch (true)
		{
			// All right angles within element
			case ((orbitalPosition == 0) || (orbitalPosition == 360)):  // top
				position[0] = element_center[0] - Math.round(tooltip.width() / 2);
				position[1] = element_center[1] - Math.round(element_to_add_tooltip.height() / 2) - (tooltip.height() + spacing);
				break;
			case (orbitalPosition == 90):  // right
				position[0] = element_center[0] + Math.round(element_to_add_tooltip.width() / 2) +  spacing;
				position[1] = element_center[1] - Math.round(tooltip.height() / 2);
				break;
			case (orbitalPosition == 180):  // bottom
				position[0] = element_center[0] - Math.round(tooltip.width() / 2);
				position[1] = element_center[1] + Math.round(element_to_add_tooltip.height() / 2) + spacing;
				break;
			case (orbitalPosition == 270):  // left
				position[0] = element_center[0] - Math.round(element_to_add_tooltip.width() / 2) - (tooltip.width() + spacing);
				position[1] = element_center[1] - Math.round(tooltip.height() / 2);
				break;
			// Quadrants - between angles bisecting the corners of the object
			case (((orbitalPosition >= topleft_indegrees) && (orbitalPosition < 360)) || (orbitalPosition < topright_indegrees)):  		// top
				if (orbitalPosition >= topleft_indegrees) {
					degrees_from_bisector = 360 - orbitalPosition;
					var tt_shift = 1 - calculate_opposite_side((element_to_add_tooltip.height()/2), degrees_from_bisector);
					tt_shift = tt_shift - calculate_opposite_side((tooltip.height()/2), degrees_from_bisector);
				} 
				if (orbitalPosition < topright_indegrees) {  
					degrees_from_bisector = orbitalPosition;
					var tt_shift = calculate_opposite_side((element_to_add_tooltip.height()/2), degrees_from_bisector);
					tt_shift = tt_shift + calculate_opposite_side((tooltip.height()/2), degrees_from_bisector);
				}
				position[0] = element_center[0] + offset + tt_shift - Math.round(tooltip.width()/2); 
				position[1] = element_center[1] - Math.round(element_to_add_tooltip.height() / 2) - (tooltip.height() + spacing);
				break;
			case ((orbitalPosition >= topright_indegrees) && (orbitalPosition < bottomright_indegrees)):  	// right
				if (orbitalPosition < 90) {  
					degrees_from_bisector = 90 - orbitalPosition;
					var tt_shift = 1 - calculate_opposite_side((element_to_add_tooltip.width()/2), degrees_from_bisector);
				} else {  
					degrees_from_bisector = orbitalPosition - 90;
					var tt_shift = calculate_opposite_side((element_to_add_tooltip.width()/2), degrees_from_bisector);
				}		
				position[0] = element_center[0] + Math.round(element_to_add_tooltip.width() / 2) + spacing;
				position[1] = element_center[1] + offset + tt_shift - Math.round(tooltip.height()/2); 
				break;
			case ((orbitalPosition >= bottomright_indegrees) && (orbitalPosition < bottomleft_indegrees)):  // bottom
				if (orbitalPosition < 180) {  
					degrees_from_bisector = 180 - orbitalPosition;
					var tt_shift = calculate_opposite_side((element_to_add_tooltip.height()/2), degrees_from_bisector);
				} else {  
					degrees_from_bisector = orbitalPosition - 180;
					var tt_shift = 1 - calculate_opposite_side((element_to_add_tooltip.height()/2), degrees_from_bisector);
				}
				position[0] = element_center[0] + offset + tt_shift - Math.round(tooltip.width()/2); 
				position[1] = element_center[1] + Math.round(element_to_add_tooltip.height()/2) + spacing;
				break;
			case ((orbitalPosition >= bottomleft_indegrees) && (orbitalPosition < topleft_indegrees)):  	// left
				if (orbitalPosition < 270) {  
					degrees_from_bisector = 270 - orbitalPosition;
					var tt_shift = calculate_opposite_side((element_to_add_tooltip.width()/2), degrees_from_bisector); 
				} else {  
					degrees_from_bisector = orbitalPosition - 270;
					var tt_shift = 1 - calculate_opposite_side((element_to_add_tooltip.width()/2), degrees_from_bisector); 
				}	
				position[0] = element_center[0] - Math.round(element_to_add_tooltip.width() / 2) - (tooltip.width() + spacing);
				position[1] = element_center[1] + offset + tt_shift - Math.round(tooltip.height()/2); 
				break;
		}
		
		return position;
	}
	
	function position(element,x,y)
	{
		element.stop(true, true);		
		element.css("position","absolute");
		element.css("top",y);
		element.css("left",x);
		revealTooltip(element);
	}
	
	function get_element_center_coordinates(element)
	{	
		var center_of_element = new Array();
		
		var element_top_left_coords = element.offset()		
		center_of_element[0] = element_top_left_coords.left + Math.round((element.width() + get_horizontal_padding(element)) / 2);
		center_of_element[1] = element_top_left_coords.top + Math.round((element.height() + get_vertical_padding(element)) / 2);
		
		return center_of_element;
	}	
	
	function revealTooltip(tooltip)
	{
		tooltip.fadeIn(200);
	}
	
	function hideTooltip(tooltip)
	{	
		tooltip.fadeOut(200);
	}
		    
})(jQuery);