/**
	* Purpose: This JavaScript class drives an admin interface for a calendar. 
 	* Most of the calendar is dynamic and operates through JavaScript, 
 	* and this file manages those operations. The logic makes use of Prototype and Script.aculo.us. 
 	*
	* Libraries: Prototype and Script.aculo.us
	*
 	* Copyright: Up and Running
 	* Date: 5/1/2008
 	* Author: Pete Hanson <peteh@uarss.com>
 	*
 	*/


	/** An integer that is equal to the number of the day that is currently open
	or null if no day is open **/
	var curOpen = null;
	var openedAt = 0;
	
	/**
	 * This is triggered when a day is clicked on, it will either
	 * display the form to add items to a day or redirect the click
	 * to the copy handler
	 */
	function openDay(date){
		if(copyMode != COPY_NONE)
			return copyClick(date);
		
		if(curOpen == date)
			return;
	
		elementTop = $('daydiv'+date).offsetTop;
		elementLeft = $('daydiv'+date).offsetLeft;
		
		$('formdiv').style.position = 'absolute';
		$('formdiv').style.display = 'block';
		$('formdiv').style.left = (elementLeft-180)+'px';
		$('formdiv').style.top = (elementTop-170)+'px';
		$('formdiv').style.zIndex = 100;
		
		$('datedisplay').innerHTML = date;
		autoFillers["additem"].lastValue = '';
		$('date').value = date;
		$('additem').value = '';
		$('price').value = '';
		
		shadeRows('itemlist'+date);
		$('editlist').innerHTML = $('itemlist'+date).innerHTML;
		
		openedAt = (new Date()).getTime();
		curOpen = date;
		
	}
	
	function shadeRows(toshade){
	
		var curClass;
		
		var items = $(toshade).getElementsByTagName('li');
		for(index = 0; index < items.length; index++){
			curClass = (curClass == 'licolor1') ? 'licolor2' : 'licolor1';
			items[index].className = curClass;
		}
		
	}
	
	/**
	 * Hide the form to add items to a day
	 */
	function closeDay(day){
		var now = (new Date()).getTime();
		if(now-200 > openedAt){
			$('formdiv').style.display = 'none';
			curOpen = null;
		}
	}
	
	var closetimer = null;
	function delayCloseDay(){
		clearTimeout(closetimer);
		closetimer = setTimeout(function(){ closeDay(curOpen); },150);
	}
	
	/**
	 * This closes the currently open day when the user clicks on the document's body
	 */
	Event.observe(document,"click",function(event){
		if(!curOpen) return;
	
		var element = Event.element(event);

		if(event.type == "click" && (!element.descendantOf || !element.descendantOf($('formdiv'))))
			closeDay(curOpen);
	});
	
	/**
	 * This is called after an item is added, it adds the
	 * item to the display or displays an error
	 */
	function itemAdded(request){
		eval('var reqdata = '+request.responseText);
		if(reqdata['status']){
			addItemToDisplay(reqdata['date'],reqdata['id'],reqdata['name'],reqdata['price']);
		}else{
			message = "<span class='ERROR'>"+reqdata['error']+"</span>";
	 		$('status').innerHTML = message;
	 		flashNotification();
		}
	}
	
	/**
	 * This function adds an item to a date cell
	 */
	function addItemToDisplay(date,id,namei,price){
			newItem = $(document.createElement("li"));
			newItem.innerHTML = "<img onclick=\"removeItem('"+date+"',"+id+")\" src='/share/icons/delete_cafe.gif' onmouseout=\"this.src='/share/icons/delete_cafe.gif'\" onmouseover=\"this.src='/share/icons/delete_cafe_over.gif'\"  align='right' /><div class='pricedisplay'>"+price+"</div><a href='index.php?p=editcafeitem&item="+id+"' onclick=\"curOpen='"+date+"'\"><span>"+namei+"</span></a>";
			$('itemlist'+date).appendChild(newItem);
			
			if(curOpen){
				shadeRows('itemlist'+curOpen);
				$('editlist').innerHTML = $('itemlist'+curOpen).innerHTML;
			}
	}
	
	/**
	 * This is called after an item is removed, it removes
	 * the item from the display or displays an error
	 */
	function itemRemoved(request){
		eval('var reqdata = '+request.responseText);
		if(reqdata['status']){
			
			var spans = null;
			var span = null;
			var items = $('itemlist'+reqdata['date']).getElementsByTagName('li');
			for(i = 0; i < items.length; i++){
				spans = items[i].getElementsByTagName('span');
				span = spans[0];
				if(span.innerHTML == reqdata['name']){
					items[i].parentNode.removeChild(items[i]);
				}
			}
			
			if(curOpen){
				shadeRows('itemlist'+curOpen);
				$('editlist').innerHTML = $('itemlist'+curOpen).innerHTML;
			}
			
		}else{
			message = "<span class='ERROR'>"+reqdata['error']+"</span>";
	 		$('status').innerHTML = message;
	 		flashNotification();
		}
	}
	
	/**
	 * Remove an item from a specific date
	 * 
	 * @param day The day number (of the month), used for display purposes
	 * @param date The date in a valid date format (Y-m-d) that the item should be removed from
	 * @param itemid The id number of the item to remove
	 */
	function removeItem(date,itemid){
		new Ajax.Request('index.php?p=removecafeitem&date='+encodeURIComponent(date)+'&id='+itemid,{onSuccess: itemRemoved});
	}
	
	/**
	 * Called when a save button is pressed, saves the item to the specified day and clears the input box
	 * 
	 * @param date The date in a valid date format (Y-m-d) that the item should be added to
	 */
	function triggerSave(){
		itemName = encodeURIComponent($('additem').value);
		price = encodeURIComponent($('price').value);
		date = encodeURIComponent($('date').value);
		itype = encodeURIComponent($('type').value);
	
		new Ajax.Request('index.php?p=addcafeitem&date='+date+'&_='+itemName+'&data='+price+'&enddate=next&type='+itype,{onSuccess: itemAdded});
		
		$('additem').value = '';
		$('price').value = '';
	}
	
	/**
	 * These vars keep track of the state that the copy system is in
	 */
	var COPY_NONE = 0;
	var SELECT_SRC = 1;
	var SELECT_DEST = 2;
	var copyMode = COPY_NONE;
	
	var sourceDay;
	var destDays = [];
	
	function changeCopyMode(newMode){
		copyMode = newMode;
		
		switch(newMode){
			case COPY_NONE:
				$('copy_instructions').innerHTML = "<i>Click on the Copy Day button to copy menu items between days</i>";
				$('copyDayButton').style.display = 'inline';
				$('copyCancel').style.display = 'none';
				$('copySave').style.display = 'none';
			break;
			case SELECT_SRC:
				$('copy_instructions').innerHTML = "<i>Click on the day from which you would like to copy menu items</i>";
				$('copyCancel').style.display = 'inline';
				$('copyDayButton').style.display = 'none';
				$('copySave').style.display = 'none';
			break;
			case SELECT_DEST:
				$('copy_instructions').innerHTML = "<i>Click on the day or days to which you would like to copy the menu items</i>";
			break;
		}
	}
	
	/**
	 * This handler is called when the copy system is active and a user clicks on a day
	 */
	function copyClick(day){
		if(copyMode == SELECT_SRC){
			sourceDay = day;
			changeCopyMode(SELECT_DEST);
			highlightSrc(day);
			
			if(hasDestinations())
				$('copySave').style.display = 'inline';
			
		}else if(copyMode == SELECT_DEST){
		
			if(day == sourceDay){
				restoreDay(sourceDay);
				sourceDay = null;
				return changeCopyMode(SELECT_SRC);
			}
		
			var wasRemoved = false;
		
			for(index = 0; index < destDays.length; index++){
				if(destDays[index] == day){
					restoreDay(destDays[index]);
					destDays[index] = null;
					wasRemoved = true;
					break;
				}
			}
			
			if(!wasRemoved){
				highlightDest(day);
				destDays[destDays.length] = day;
				$('copySave').style.display = 'inline';
			}
			
			if(!hasDestinations()){
				$('copySave').style.display = 'none';
				destDays = [];
			}
			
		}
	}
	
	/**
	 * This returns true if destinations have been selected,
	 * otherwise it returns false.
	 */
	function hasDestinations(){
		for(index = 0; index < destDays.length; index++){
			if(destDays[index])
				return true;
		}
		
		return false;
	}
	
	function endCopy(performCopy){
	
		if(performCopy && sourceDay && hasDestinations()){
			initCopy();
		}
	
		if(sourceDay)
			restoreDay(sourceDay);
			
		for(index = 0; index < destDays.length; index++){
			if(destDays[index])
				restoreDay(destDays[index]);
		}
		
		changeCopyMode(COPY_NONE);
		destDays = [];
	}
	
	function restoreDay(date){
			$('daydiv'+date).style.background = '';
	}
	
	function highlightDest(date){
			$('daydiv'+date).style.background = '#fff7ae';
	}
	
	function highlightSrc(date){
			$('daydiv'+date).style.background = '#8fe3d8';
	}
	
	function initCopy(){
		destString = "";
		
		for(index = 0; index < destDays.length; index++){
			if(destDays[index]){
				destString += "&dest[]="+encodeURIComponent(destDays[index]);
			}
		}
		
		new Ajax.Request('index.php?p=copycafeitems&src='+encodeURIComponent(sourceDay)+destString,{onSuccess: copyComplete});
	}
	
	function copyComplete(request){
		var daysClear = [];
	
		eval('var returndata = '+request.responseText);
		if(returndata['status']){
			for(index = 0; index < returndata['data'].length; index++){
				reqdata = returndata['data'][index];
				if(!daysClear[reqdata['date']]){
					$('itemlist'+reqdata['date']).innerHTML = '';
					daysClear[reqdata['date']] = true;
				}
				
				if(reqdata['id'])
					addItemToDisplay(reqdata['date'],reqdata['id'],reqdata['name'],reqdata['price']);
			}
		}else{
			message = "<span class='ERROR'>"+returndata['error']+"</span>";
	 		$('status').innerHTML = message;
	 		flashNotification();
		}
	}