/**********************************************************************
* JavaScript Lib
* at this point this is just a place I put most of the generic stuff I 
* use.
* 
* P.S. the name "jli" just stands for Java script LIb, like how it 
* looks...
**********************************************************************/

var DEBUG = true


/*********************************************************************/
// XXX find a better name for this... 

// this will create a function that will add/remove a css_class to elem 
// calling the optional callbacks before and/or after.
//
// elem is a jquery compatible object; default use-case: a css selector.
//
// the resulting function understands the folowing arguments:
// 	- 'on'			: switch mode on
// 	- 'off'			: switch mode off
// 	- '?'			: return current state ('on'|'off')
// 	- no arguments	: toggle the state
//
// NOTE: of only one callback is given then it will be called after the 
// 		 class change...
// 		 a way around this is to pass an empty function as callback_b
//
function createCSSClassToggler(elem, css_class, callback_a, callback_b){
	// prepare the pre/post callbacks...
	if(callback_b == null){
		var callback_pre = null
		var callback_post = callback_a
	} else {
		var callback_pre = callback_a
		var callback_post = callback_b
	}
	// build the acual toggler function...
	var func = function(action){
		if(action == null || action == '?'){
			var getter = action == '?' ? true : false
			action = 'on'
			// get current state...
			if( $(elem).hasClass(css_class) ){
				action = 'off'
			}
			if(getter){
				// as the above actions indicate intent and not state, 
				// we'll need to swap the values...
				return action == 'on' ? 'off' : 'on'
			}
		}
		if(callback_pre != null){
			callback_pre(action)
		}
		// play with the class...
		if(action == 'on'){
			$(elem).addClass(css_class)
		} else {
			$(elem).removeClass(css_class)
		}
		if(callback_post != null){
			callback_post(action)
		}
	}
	func.doc = 'With no arguments this will toggle between "on" and '+
		'"off".\n'+
		'If either "on" or "off" are given then this will switch '+
		'to that mode.\n'+
		'If "?" is given, this will return either "on" or "off" '+
		'depending on the current state.'
	return func
}


// show a jQuary opject in viewer overlay...
// XXX need to set .scrollTop(0) when showing different UI... 
// 		...and not set it when the UI is the same
// XXX this must create it's own overlay...
function showInOverlay(obj){
	obj.click(function(){ return false })
	// XXX 
	$('.viewer').addClass('overlay-mode')
	// clean things up...
	$('.overlay .content').children().remove()
	// put it in the overlay...
	$('.overlay .content').append(obj)
	// prepare the overlay...
	$('.overlay')
		.one('click', function(){
			$('.overlay')
				.fadeOut(function(){
					$('.overlay .content')
						.children()
							.remove()
					$('.overlay-mode').removeClass('overlay-mode')
				})
		})
		.fadeIn()
	return obj
}



function overlayMessage(text){
	return showInOverlay($('<div class="overlay-message">' +text+ '</div>'))
}



function unanimated(obj, func, time){
	return function(){
		if(time == null){
			time = 5
		}	
		obj.addClass('unanimated')
		var res = func.apply(func, arguments)
		setTimeout(function(){obj.removeClass('unanimated')}, time)
		return res
	}
}



// Return a scale value for the given element(s).
// NOTE: this will only return a single scale value...
function getElementScale(elem){
	//var transform = elem.css('transform')
	var vendors = ['o', 'moz', 'ms', 'webkit']
	var transform = elem.css('transform')
	var res

	// go through vendor prefixes... (hate this!)
	if(!transform || transform == 'none'){
		for(var i in vendors){
			transform = elem.css('-' + vendors[i] + '-transform')
			if(transform && transform != 'none'){
				break
			}
		}
	}
	// no transform is set...
	if(!transform || transform == 'none'){
		return 1
	}
	// get the scale value -- first argument of scale/matrix...
	return parseFloat((/(scale|matrix)\(([^,]*),.*\)/).exec(transform)[2])
}

function setElementScale(elem, scale){
	return elem.css({
		'transform': 'scale('+scale+')',
		'-moz-transform': 'scale('+scale+')',
		'-o-transform': 'scale('+scale+')',
		'-ms-transform': 'scale('+scale+')',
		'-webkit-transform': 'scale('+scale+')',
	})
}


/************************************************ jQuery extensions **/

jQuery.fn.reverseChildren = function(){
	return $(this).each(function(_, e){
		return $(e).append($(e).children().detach().get().reverse())
	})
}



jQuery.fn.sortChildren = function(func){
	return $(this).each(function(_, e){
		return $(e).append($(e).children().detach().get().sort(func))
	})
}




/**********************************************************************
* vim:set ts=4 sw=4 :                                                */