/**
*  jQuery Plugin highlightFade (jquery.offput.ca/highlightFade)
*  (c) 2006 Blair Mitchelmore (offput.ca) blair@offput.ca
*/
/**
* This is version 0.7 of my highlightFade plugin. It follows the yellow fade technique of Web 2.0 fame
* but expands it to allow any starting colour and allows you to specify the end colour as well.
*
* For the moment, I'm done with this plug-in. Unless I come upon a really cool feature it should have
* this plug-in will only receive updates to ensure future compatibility with jQuery.
*
* As of now (Aug. 16, 2006) the plugin has been written with the 1.0.1 release of jQuery (rev 249) which
* is available from http://jquery.com/src/jquery-1.0.1.js
*
* A note regarding rgb() syntax: I noticed that most browsers implement rgb syntax as either an integer 
* (0-255) or percentage (0-100%) value for each field, that is, rgb(i/p,i/p,i/p); however, the W3C 
* standard clearly defines it as "either three integer values or three percentage values" [http://www.w3.org/TR/CSS21/syndata.html] 
* which I choose to follow despite the error redundancy of the typical behaviour browsers employ.
*
* Changelog:
*
*    0.7:
*        - Added the awesome custom attribute support written by George Adamson (slightly modified)
*        - Removed bgColor plugin dependency seeing as attr is customizable now...
*    0.6:
*        - Abstracted getBGColor into its own plugin with optional test and data retrieval functions
*        - Converted all $ references to jQuery references as John's code seems to be shifting away
*          from that and I don't want to have to update this for a long time.
*    0.5:
*        - Added simple argument syntax for only specifying start colour of event
*        - Removed old style argument syntax
*        - Added 'interval', 'final, and 'end' properties
*        - Renamed 'color' property to 'start'
*        - Added second argument to $.highlightFade.getBGColor to bypass the e.highlighting check
*    0.4:
*        - Added rgb(%,%,%) color syntax
*    0.3:
*        - Fixed bug when event was called while parent was also running event corrupting the
*          the background colour of the child
*    0.2:
*        - Fixed bug where an unspecified onComplete function made the page throw continuous errors
*        - Fixed bug where multiple events on the same element would speed each subsequent event
*    0.1:
*        - Initial Release
* 
* @author          Blair Mitchelmore (blair@offput.ca)
* @version         0.5
*/
jQuery.fn.highlightFade = function(settings) {
	var o = (settings && settings.constructor == String) ? { start: settings} : settings || {};
	var d = jQuery.highlightFade.defaults;
	var i = o['interval'] || d['interval'];
	var a = o['attr'] || d['attr'];
	var ts = {
		'linear': function(s, e, t, c) { return parseInt(s + (c / t) * (e - s)); },
		'sinusoidal': function(s, e, t, c) { return parseInt(s + Math.sin(((c / t) * 90) * (Math.PI / 180)) * (e - s)); },
		'exponential': function(s, e, t, c) { return parseInt(s + (Math.pow(c / t, 2)) * (e - s)); }
	};
	var t = (o['iterator'] && o['iterator'].constructor == Function) ? o['iterator'] : ts[o['iterator']] || ts[d['iterator']] || ts['linear'];
	if (d['iterator'] && d['iterator'].constructor == Function) t = d['iterator'];
	return this.each(function() {
		if (!this.highlighting) this.highlighting = {};
		var e = (this.highlighting[a]) ? this.highlighting[a].end : jQuery.highlightFade.getBaseValue(this, a) || [255, 255, 255];
		var c = jQuery.highlightFade.getRGB(o['start'] || o['colour'] || o['color'] || d['start'] || [255, 255, 128]);
		var s = jQuery.speed(o['speed'] || d['speed']);
		var r = o['final'] || (this.highlighting[a] && this.highlighting[a].orig) ? this.highlighting[a].orig : jQuery.curCSS(this, a);
		if (o['end'] || d['end']) r = jQuery.highlightFade.asRGBString(e = jQuery.highlightFade.getRGB(o['end'] || d['end']));
		if (typeof o['final'] != 'undefined') r = o['final'];
		if (this.highlighting[a] && this.highlighting[a].timer) window.clearInterval(this.highlighting[a].timer);
		this.highlighting[a] = { steps: ((s.duration) / i), interval: i, currentStep: 0, start: c, end: e, orig: r, attr: a };
		jQuery.highlightFade(this, a, o['complete'], t);
	});
};

jQuery.highlightFade = function(e, a, o, t) {
	e.highlighting[a].timer = window.setInterval(function() {
		var newR = t(e.highlighting[a].start[0], e.highlighting[a].end[0], e.highlighting[a].steps, e.highlighting[a].currentStep);
		var newG = t(e.highlighting[a].start[1], e.highlighting[a].end[1], e.highlighting[a].steps, e.highlighting[a].currentStep);
		var newB = t(e.highlighting[a].start[2], e.highlighting[a].end[2], e.highlighting[a].steps, e.highlighting[a].currentStep);
		jQuery(e).css(a, jQuery.highlightFade.asRGBString([newR, newG, newB]));
		if (e.highlighting[a].currentStep++ >= e.highlighting[a].steps) {
			jQuery(e).css(a, e.highlighting[a].orig || '');
			window.clearInterval(e.highlighting[a].timer);
			e.highlighting[a] = null;
			if (o && o.constructor == Function) o.call(e);
		}
	}, e.highlighting[a].interval);
};

jQuery.highlightFade.defaults = {
	start: [255, 255, 128],
	interval: 50,
	speed: 400,
	attr: 'backgroundColor'
};

jQuery.highlightFade.getRGB = function(c, d) {
	var result;
	if (c && c.constructor == Array && c.length == 3) return c;
	if (result = /rgb\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*\)/.exec(c))
		return [parseInt(result[1]), parseInt(result[2]), parseInt(result[3])];
	else if (result = /rgb\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*\)/.exec(c))
		return [parseFloat(result[1]) * 2.55, parseFloat(result[2]) * 2.55, parseFloat(result[3]) * 2.55];
	else if (result = /#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/.exec(c))
		return [parseInt("0x" + result[1]), parseInt("0x" + result[2]), parseInt("0x" + result[3])];
	else if (result = /#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])/.exec(c))
		return [parseInt("0x" + result[1] + result[1]), parseInt("0x" + result[2] + result[2]), parseInt("0x" + result[3] + result[3])];
	else
		return jQuery.highlightFade.checkColorName(c) || d || null;
};

jQuery.highlightFade.asRGBString = function(a) {
	return "rgb(" + a.join(",") + ")";
};

jQuery.highlightFade.getBaseValue = function(e, a, b) {
	var s, t;
	b = b || false;
	t = a = a || jQuery.highlightFade.defaults['attr'];
	do {
		s = jQuery(e).css(t || 'backgroundColor');
		if ((s != '' && s != 'transparent') || (e.tagName.toLowerCase() == "body") || (!b && e.highlighting && e.highlighting[a] && e.highlighting[a].end)) break;
		t = false;
	} while (e = e.parentNode);
	if (!b && e.highlighting && e.highlighting[a] && e.highlighting[a].end) s = e.highlighting[a].end;
	if (s == undefined || s == '' || s == 'transparent') s = [255, 255, 255];
	return jQuery.highlightFade.getRGB(s);
};

jQuery.highlightFade.checkColorName = function(c) {
	if (!c) return null;
	switch (c.replace(/^\s*|\s*$/g, '').toLowerCase()) {
		case 'aqua': return [0, 255, 255];
		case 'black': return [0, 0, 0];
		case 'blue': return [0, 0, 255];
		case 'fuchsia': return [255, 0, 255];
		case 'gray': return [128, 128, 128];
		case 'green': return [0, 128, 0];
		case 'lime': return [0, 255, 0];
		case 'maroon': return [128, 0, 0];
		case 'navy': return [0, 0, 128];
		case 'olive': return [128, 128, 0];
		case 'purple': return [128, 0, 128];
		case 'red': return [255, 0, 0];
		case 'silver': return [192, 192, 192];
		case 'teal': return [0, 128, 128];
		case 'white': return [255, 255, 255];
		case 'yellow': return [255, 255, 0];
	}
};