/*
Performer JavaScript library
Created by Chris Taylor (http://www.stillbreathing.co.uk)
Additional work by kourge
Based on the Prototype framework (http://www.prototypejs.org)
This work is released under a Creative Commons Attribution-ShareAlike 3.0 license
*/
var Performer =
{
	Init: function()
	{
		// do the transformations
		Performer.DoTransformers();
		// set up listeners
		Performer.DoListeners();
		// set up global variables
		Performer.FillerElement;
		Performer.TextValue;
	},
	DoListeners: function()
	{
		Performer.Listeners('toggler','Toggle','click');
		Performer.Listeners('switcher','Switch','click');
		Performer.Listeners('loader','Load','click');
		Performer.Listeners('toggleloader','ToggleLoad','click');
		Performer.Listeners('sizer','Size','click');
		Performer.Listeners('tabber','Tab','click');
		Performer.Listeners('selector','Select','change,keyup');
		Performer.Listeners('limiter','Limit','keyup');
		Performer.Listeners('editor','Edit','click,keyup');
		Performer.Listeners('uneditor','UnEdit','click,keyup');
		Performer.Listeners('prompter','RemovePrompt','focus');
		Performer.Listeners('prompter','CheckPrompt','blur');
		Performer.Listeners('popper','Pop','click,keyup');
	},
	DoTransformers: function()
	{
		Performer.Transformers('hider','Hide');
		Performer.Transformers('shower','Show');
		Performer.Transformers('focusser','Focus');
		Performer.Transformers('limiter','LimitNotifier');
		Performer.Transformers('reloader','Reload');
		Performer.Transformers('prompter','SetPrompt');
	},
    // listen for the required classnames
    Listeners: function(className,f,event)
    {
	document.getElementsByClassName(className).each(function(element)
	{
            event.split(',').each(function(event)
            {
                Event.observe(element, event, Performer[f], false);
            });
	});
    },
    // transform the required classnames
    Transformers: function(className,f)
    {
	document.getElementsByClassName(className).each(function(element)
	{
            Performer[f](element);
	});
    },
    // send a list selection to a remote page
    Select: function(e)
    {
      var el = Event.element(e);
      // check the element has the required attributes
      if (el.readAttribute && el.readAttribute('id') && el.readAttribute('name') && el.readAttribute('class'))
      {
	// get the classes
	var classes = el.readAttribute('class').split(' ');
	// loop the classes, trying to get the rev and rel
	for (var i=0; i<classes.length; i++)
	{
          // targetEl
          if (classes[i].match(/^targetEl-/)){ var targetEl = classes[i].replace('targetEl-', ''); }
          // targetPage
          if (classes[i].match(/^targetPage-/)){ var targetPage = classes[i].replace('targetPage-', ''); }
	}
	// check we have a targetPage and targetEl
	if (targetPage && targetEl)
	{
           // check the target element can be found
           if ($(targetEl))
           {
             Performer.FillerElement = targetEl;
             $Loader = new Ajax.Request(targetPage + '?selection=' + el.getValue(), {method: 'post', onComplete: Performer.FillAndInit});
           }
	}
      }
    },
    // toggle element
    Toggle: function(e,c)
    {
	r = false;
	var el = Event.findElement(e, 'A');
	// check the element has the required attribute
	if (el.readAttribute && el.readAttribute('rel'))
	{
            var targetEl = el.readAttribute('rel');
            // check the target element can be found
            if ($(targetEl))
            {
		// toggle the visibility
                //if (!$(targetEl).visible())
                //{
                //    $(targetEl).show();
                //    r = true;
                //} else {
                //    $(targetEl).hide();
                //    r = false;
                //}

                if (!$(targetEl).hasClassName('show'))
                {
                    $(el).addClassName('open');

                    $(targetEl).removeClassName('hide');
                    $(targetEl).addClassName('show');
                    r = true;
                } else {
                    $(el).removeClassName('open');

                    $(targetEl).removeClassName('show');
                    $(targetEl).addClassName('hide');
                    r = false;
                }
            }
	}
	if (!c) Event.stop(e);
	return r;
    },
    // switch visibility of two element
    Switch: function(e,c)
    {
	r = false;
	//var el = Event.element(e);
	var el = Event.findElement(e, 'A');
	// check the element has the required attribute
	if (el.readAttribute && el.readAttribute('rel') && el.readAttribute('rev'))
	{
            var targetEl1 = el.readAttribute('rel');
	    var targetEl2 = el.readAttribute('rev');
            // check the target elements can be found
            if ($(targetEl1) && $(targetEl2))
            {
		// toggle the visibility
                if (!$(targetEl1).visible())
                {
                    $(targetEl1).show();
		    $(targetEl2).hide();
                    r = true;
                } else {
                    $(targetEl2).show();
		    $(targetEl1).hide();
                    r = false;
                }
            }
        }
	if (!c) Event.stop(e);
	return r;
    },
    // focus the element
    Focus: function(e)
    {
	var el = $(e);
	if (el)
	{
            $(el).focus();
	}
    },
    // resize the element
    Size: function(e)
    {
	var el = Event.findElement(e, 'A');
	// check the element has the required attributes
	if (el.readAttribute && el.readAttribute('rel') && el.readAttribute('rev'))
	{
            var targetEl = el.readAttribute('rel');
            // check the target element can be found
            if ($(targetEl))
            {
                // get the new size
                var sizes = el.readAttribute('rev');
                // get the height/width values
                if (sizes.indexOf(',')>=0)
                {
                  var sizeParts = sizes.split(',');
                  var height = sizeParts[0];
                  var width = sizeParts[1];
                } else {
                  var height = sizes;
                  var width = 0;
                }
                if (height==''){ height = 0; }
                if (width==''){ width = 0; }
                // get current dimensions
                var dimensions = $(targetEl).getDimensions();
                var currentHeight = dimensions.height;
                var currentWidth = dimensions.width;
                // calculate the new dimensions and resize the element
                if (height != 0){
                    var newHeight = (parseFloat(height) + parseFloat(currentHeight)) + 'px';
                    $(targetEl).setStyle({ height: newHeight });
                }
                if (width != 0)
                {
                    var newWidth = (parseFloat(width) + parseFloat(currentWidth)) + 'px';
                    $(targetEl).setStyle({ width: newWidth });
                }
            }
	}
	Event.stop(e);
	Performer.DoTransformers();
    },
    // toggle an element and load data
    ToggleLoad: function(e)
    {
	var el = Event.element(e);
	// check the element has the required attributes
	if (el.readAttribute && el.readAttribute('rel') && el.readAttribute('rev'))
	{
           var targetEl = el.getAttribute('rel');
           // check the target element can be found
           if ($(targetEl))
           {
             if (Performer.Toggle(e,true))
             {
               Performer.Load(e,true,true);
             }
           }
	}
	Event.stop(e);
    },
    // toggle tabs
    Tab: function(e)
    {
	var el = Event.findElement(e, 'A');
	// check the element has the required attributes
	if (el.readAttribute && el.readAttribute('rel') && el.readAttribute('rev'))
	{
            var tabGroup = el.readAttribute('rel');
            var openTab = el.readAttribute('rev');
            // check the tabgroup can be found
            if ($(tabGroup))
            {
                // hide all the tabs
                var tabs = $(tabGroup).getElementsByClassName('tab');
                for (var i=0; i<tabs.length; i++)
                {
                    $(tabs[i]).removeClassName('show');
                    $(tabs[i]).addClassName('hide');
                }
                // show the required tab
                $(openTab).removeClassName('hide');
                $(openTab).addClassName('show');
            }
	}
	Event.stop(e);
    },
    // load data into an element
    Load: function(e,c,s)
    {
	var el = Event.findElement(e, 'A');
	// check the element has the required attributes
	if (el.readAttribute && el.readAttribute('rel') && el.readAttribute('rev'))
	{
            var targetEl = el.readAttribute('rel');
            var targetPage = el.readAttribute('rev');
            // check the target element can be found
            if ($(targetEl))
            {
                Performer.FillerElement = targetEl;
		if(!s)
		{
			$Loader = new Ajax.Request(targetPage, {method: 'get', onComplete: Performer.FillAndInit});
		} else {
			$Loader = new Ajax.Request(targetPage, {method: 'get', onComplete: Performer.Fill});
		}
            }
	}
	if (!c) Event.stop(e);
    },
    // load data into an element on a regular basis
    Reload: function(e)
    {
	var el = Event.findElement(e, 'A');;
	// check the element has the required attributes
	if (el.readAttribute && el.readAttribute('rel') && el.readAttribute('rev'))
	{
            var delay = el.readAttribute('rel');
            var targetPage = el.readAttribute('rev');
            Performer.FillerElement = targetEl;
            $Loader = new Ajax.Request(targetPage, {method: 'get', onComplete: Performer.Filler});
	}
	if (!c) Event.stop(e);
	Performer.DoTransformers();
    },
    // fill an element with data
    Fill: function(request)
    {
	var text = request.responseText;
	// check the target element can be found
	if ($(Performer.FillerElement))
	{
            $(Performer.FillerElement).innerHTML = text;
	}
    },
    // fill an element with data then initialise the Performer functions
    FillAndInit: function(request)
    {
	var text = request.responseText;
	// check the target element can be found
	if ($(Performer.FillerElement))
	{
            $(Performer.FillerElement).innerHTML = text;
	}
	Performer.Init();
    },
    // hide a hider element
    Hide: function(e)
    {
	//var el = $(e);
	//if (el)
	//{
	//    el.hide();
	//}

	var el = $(e);
	if (el)
	{
            el.removeClassName('hider');
            el.addClassName('hide');
	}
    },
    // show a shower element
    Show: function(e)
    {
	var el = $(e);
	if (el)
	{
            el.removeClassName('shower');
            el.addClassName('show');
	}
    },
    // get the parameters for a limiter
    GetLimitParams: function(el)
    {
	// check the element has the required attributes and is an input or textarea
	if (el.readAttribute && el.readAttribute('id') && el.classNames() && (el.type == 'textarea' || el.type == 'text'))
	{
            var targetEl;
            var lengthLimit;
            // loop the classes, trying to get the rev and rel
            el.classNames().each(function(cls)
            {
                // targetEl
                if (cls.match(/^targetEl-/)){ targetEl = cls.replace('targetEl-', ''); }
                // targetPage
                if (cls.match(/^lengthLimit-/)){ lengthLimit = cls.replace('lengthLimit-', ''); } else { lengthLimit = 255; }
            })
            // check the target element can be found
            if (targetEl && $(targetEl))
            {
                var params = new Array();
                params["lengthLimit"] = lengthLimit;
                params["targetEl"] = targetEl;
                return params;
            } else {
                return false;
            }
	} else {
            return false;
	}
    },
    // limit the amount of text in an input box or textarea
    Limit: function(e)
    {
	var el = Event.element(e);
	// get the parameters
	var params = Performer.GetLimitParams(el);
	if (params && params["lengthLimit"] && params["targetEl"])
	{
            var lengthLimit = params["lengthLimit"];
            var targetEl = params["targetEl"];
            var currentLength = $F(el).length;
            // limit the length
            if (parseFloat(currentLength) >= parseFloat(lengthLimit))
            {
                $(el).value = $F(el).substr(0,lengthLimit);
                $(targetEl).update("Limit reached");
            } else {
                $(targetEl).update((lengthLimit-currentLength) + " characters left");
            }
	}
    },
    // show the length limit notification
    LimitNotifier: function(e)
    {
	var el = $(e);
	// get the parameters
	var params = Performer.GetLimitParams(el);
	// check this doesn't have prompt text in
	if (!el.hasClassName('prompter'))
	{
            if (params && params["lengthLimit"] && params["targetEl"])
            {
                var currentLength = $F(el).length;
                $(params["targetEl"]).update((params["lengthLimit"]-currentLength) + " characters left");
            }
	} else {
            $(params["targetEl"]).update(params["lengthLimit"] + " characters left");
	}
    },
    // edit the contents of an element and send the results to a processing page
    Edit: function(e)
    {
	var el = Event.element(e);
	if (el.readAttribute && el.readAttribute('id') && el.classNames())
	{
            var targetPage;
            var inputType;
            // loop the classes
            el.classNames().each(function(cls)
            {
                // targetPage
                if (cls.match(/^targetPage-/)){ targetPage = cls.replace('targetPage-', ''); }
            })
            if (targetPage)
            {
                // build the editing form
		Performer.TextValue = $(el).innerHTML;
                el.innerHTML = Performer.BuildEditForm(el,targetPage);
                Performer.Init();
            }
	}
    },
    // build the element editing form
    BuildEditForm: function(el,targetPage)
    {
	if (el && $(el) && targetPage)
	{
            var value = $(el).innerHTML;
            var editForm;
            editForm = '<form id="' + $(el).id + '-editor" class="performer-editor" action="' + targetPage + '" method="post">\n';
            editForm += '<fieldset>\n';
	    editForm += '<input type="text" id="' + $(el).id + '-value" name="' + $(el).id + '" value="' + value + '" />\n';
            editForm += '<input type="submit" id="' + $(el).id + '-save" name="' + $(el).id + '-save" value="Save" />\n';
            editForm += '<a href=\"#\" class="uneditor" rel="' + $(el).id + '">Cancel</a>\n';
            editForm += '</fieldset>\n';
            editForm += '</form>\n';
            return editForm;
	}
    },
    // cancel a Performer.Edit command and return the element to normal
    UnEdit: function(e)
    {
	var el = Event.element(e);
	if (el.readAttribute && el.readAttribute('rel'))
	{
            var targetEl = el.readAttribute('rel');
            $(targetEl).innerHTML = Performer.TextValue;
	}
	Event.stop(e);
    },
    // checks if the element has focus and if so removes the content from it
    // when the element loses focus it checks if the element has no contents and adds the prompt back in
    SetPrompt: function(el)
    {
	if (el.readAttribute && el.readAttribute('id') && el.readAttribute('title') && el.value == "" && (el.type == 'textarea' || el.type == 'text'))
	{
		el.addClassName("performer-prompter");
		el.value = el.readAttribute('title');
	}
    },
    RemovePrompt: function(e)
    {
	var el = Event.element(e);
	if (el.readAttribute && el.readAttribute('id') && el.readAttribute("title")&& (el.value == el.readAttribute("title")) && (el.type == 'textarea' || el.type == 'text'))
	{
		el.value = "";
		el.removeClassName("performer-prompter");
	}
    },
    CheckPrompt: function(e)
    {
	var el = Event.element(e);
	if (el.readAttribute && el.readAttribute('id') && el.readAttribute("title")&& (el.value == "") && (el.type == 'textarea' || el.type == 'text'))
	{
		Performer.SetPrompt(el);
	}
    },
    // open a popup window
    Pop: function(e)
    {
	var el = Event.element(e);
	// check the element has the required attributes
	if (el.readAttribute && el.readAttribute('href') && el.readAttribute('rel') && el.readAttribute('rev'))
	{
		var targetURL = el.readAttribute('href');
			var targetName = el.readAttribute('rel');
		var pageOptions = el.readAttribute('rev');
			var win = window.open(targetURL,targetName,pageOptions);
			if (window.focus) {win.focus()}
			Event.stop(e);
		}
	}
}
// load Performer
Event.observe(window, 'load', Performer.Init, false);