/**
*    Json key/value autocomplete for jQuery 
*    Provides a transparent way to have key/value autocomplete
*    Copyright (C) 2008 Ziadin Givan www.CodeAssembly.com  
*
*    This program is free software: you can redistribute it and/or modify
*    it under the terms of the GNU Lesser General Public License as published by
*    the Free Software Foundation, either version 3 of the License, or
*    (at your option) any later version.
*
*    This program is distributed in the hope that it will be useful,
*    but WITHOUT ANY WARRANTY; without even the implied warranty of
*    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*    GNU General Public License for more details.
*
*    You should have received a copy of the GNU Lesser General Public License
*    along with this program.  If not, see http://www.gnu.org/licenses/
*    
*    Examples  
*	 $("input#example").autocomplete("autocomplete.php");//using default parameters
*	 $("input#example").autocomplete("autocomplete.php",{minChars:3,timeout:3000,validSelection:false,parameters:{'myparam':'myvalue'},before : function(input,text) {},after : function(input,text) {}});
*    minChars = Minimum characters the input must have for the ajax request to be made
*	 timeOut = Number of miliseconds passed after user entered text to make the ajax request   
*    validSelection = If set to true then will invalidate (set to empty) the value field if the text is not selected (or modified) from the list of items.
*    parameters = Custom parameters to be passed
*    after, before = a function that will be caled before/after the ajax request
*/
jQuery.fn.autocomplete = function(url, settings ) 
{
	return this.each( function()//do it for each matched element
	{
		//this is the original input
		var textInput = $(this);
		
		

		settings = jQuery.extend(//provide default settings
		{
			minChars : 1,
			timeout: 1000,
			after : null,
			before : null,
			validSelection : true,
			parameters : {}
		} , settings);

		//create a new hidden input that will be used for holding the return value when posting the form, then swap names with the original input
		textInput.after('<input autocomplete="off" type="hidden" id="' + textInput.attr("name") + '_id" name="' + textInput.attr("name")  + '_text"/>');
		
		var valueInput = $(this).next();
 
		//create the ul that will hold the text and values
		valueInput.after('<ul class="autocomplete"></ul>');
		var list = valueInput.next();
		var oldText = '';
		var typingTimeout;
		var size = 0;
		var selected = -1;

                
		function getData(text)
		{
			list.html('');
			window.clearInterval(typingTimeout);
			if ((settings.minChars != null && text.length >= settings.minChars))
			{
				clear();
				
				if (settings.before) {
					settings.before(textInput,text);
				}
				settings.parameters.text = text;
				$.getJSON(url,settings.parameters,function(data)
				{
					var items = '<li class="not-item"><div class="inner">Выберите улицу</div></li>';
                                        
					if (data && data.length>0){
						textInput.removeClass('fail');
						size = data.length;
						for (i = 0; i < size; i++)//iterate over all options
						{
						  for ( key in data[i] )//get key => value
						  {	
							items += '<li value="' + key + '">' + data[i][key].replace(new RegExp("(" + text + ")","i"),"<strong>$1</strong>") + '</li>';
						  }
						  if(items){
							  list.html(items);
							  //on mouse hover over elements set selected class and on click set the selected value and close list
							  list.show().children('li[class!="not-item"]').
							  hover(function() { $(this).addClass("selected").siblings().removeClass("selected");}, function() { $(this).removeClass("selected") } ).
							  click(function () { valueInput.val( $(this).attr('value') ); textInput.val($(this).text());$('#' + settings.house).val(''); clear(); });
						  }
						}
						
					}else{
						textInput.addClass('fail');
						items += '<li class="not-i"><span>Совпадений не найдено</span></li>'

						list.html(items);
						//on mouse hover over elements set selected class and on click set the selected value and close list
						list.show();

						if (settings.after == "function"){
							settings.after(textInput,text);
						}
					}
					if (settings.after) {
						settings.after(textInput,text);
					}
				});
				
				oldText = text;
			}
		}
		
		function clear()
		{
			list.hide();
			size = 0;
			selected = 0;
		}	
		
		textInput.keydown(function(e) 
		{
			
			window.clearInterval(typingTimeout);
			if(e.which == 27)//escape
			{
				clear();
			} else if (e.which == 46 || e.which == 8)//delete and backspace
			{
				clear();
				//invalidate previous selection
				if (settings.validSelection) valueInput.val('');
			}
			else if(e.which == 13)//enter 
			{ 
				if ( list.css("display") == "none")//if the list is not visible then make a new request, otherwise hide the list
				{ 
					getData(textInput.val());
				} else
				{
					clear();
				}
				textInput.select();
				$('#' + settings.house).val('');
				e.preventDefault();
				return false;
			}
                        else if(e.which == 40 || e.which == 38)//move up, down
                        {
                            size = list.children().length;
                            if(list.children('li[class="not-i"]').length==0){
                              switch(e.which)
                              {
                                    case 40:
                                      selected = selected >= size - 1 ? 1 : selected + 1; break;
                                    case 38:
                                      selected = selected <= 1 ? size - 1 : selected - 1; break;
                                    default: break;
                              }
                              //set selected item and input values
                              textInput.val( list.children().removeClass('selected').eq(selected).addClass('selected').text() );
                              valueInput.val( list.children().eq(selected).attr('value') );
                          }
                          
			}else if(e.which == 9){
				list.hide();
			}else{ 
				//invalidate previous selection
				if (settings.validSelection) valueInput.val('');
				typingTimeout = window.setTimeout(function() { getData(textInput.val()) },settings.timeout);
			}
		});
	});
};