var TYPO_FOUND_CONF = {
	MAX_SELECTION_LENGTH: 500
	,TOO_LONG_SELECTION_MSG: "You've selected too much text!"
	,THX_MESSAGE: 'Thank you for your help!'
	,AJAX_URL: '/typofound/'
};

var TypoFound = {
	
	init: function()
	{
		var that = this;
		window.document.onkeypress = function(e){
			if (that.checkEvent(e))
			{
				var str = new String( that.getSelection() ).toString();
				if(str.length > 0)
					if (str.length > TYPO_FOUND_CONF.MAX_SELECTION_LENGTH)
					{
						alert(TYPO_FOUND_CONF.TOO_LONG_SELECTION_MSG);
						return;
					}
					else
					{
						$.post(TYPO_FOUND_CONF.AJAX_URL, {
							str: str
							,url: window.location.href
						});
						alert(TYPO_FOUND_CONF.THX_MESSAGE);
					}
				return false;
			}
		};
	}

	,getSelection: function()
	{
		try{
			return window.getSelection ?
				window.getSelection()
				: ( window.document.getSelection ?
					window.document.getSelection()
					: window.document.selection.createRange().text
				);
		} catch(e) {
			return null;
		}
	}
	
	,checkEvent: function(e)
	{
		return window.event ?
			(window.event.keyCode == 10 || (window.event.keyCode == 13 && window.event.ctrlKey))
			: ( e ?
				((e.which == 10 && e.modifiers == 2) || (e.keyCode == 0 && e.charCode == 106 && e.ctrlKey) || (e.keyCode == 13 && e.ctrlKey))
				: false
			);
	}
};

TypoFound.init();