/*
 *
 *  Ajax Autocomplete for Prototype, version 1.0.3
 *  (c) 2008 Tomas Kirda
 *
 *  Ajax Autocomplete for Prototype is freely distributable under the terms of an MIT-style license.
 *  For details, see the web site: http://www.devbridge.com/projects/autocomplete/
 *
 */

var Autocomplete = function(el, options){
  this.el = $(el);
  this.id = this.el.identify();
  this.hasFocus = false;
  this.el.setAttribute('autocomplete','off');
  this.suggestions = [];
  this.VisibleSuggestions = [];
  this.data = [];
  this.badQueries = [];
  this.selectedIndex = -1;
  this.currentValue = this.el.value;
  this.intervalId = 0;
  this.cachedResponse = [];
  this.instanceId = null;
  this.onChangeInterval = null;
  this.ignoreValueChange = false;
  this.morethanone = true;
  this.serviceUrl = options.serviceUrl;
  if ( options.morethanone != undefined )
  {
	this.morethanone = options.morethanone;
}
  this.options = {
    autoSubmit:false,
    minChars:1,
    maxHeight:300,
    deferRequestBy:0,
    width:0,
	 useAjax: true,
    container:null
  };
  if(options)
  {
	  Object.extend(this.options, options);
	  }
  if(Autocomplete.isDomLoaded){
    this.initialize();
  }else{
	  this.initialize.bind(this).defer();
    // Event.observe( window , 'load', this.initialize.bind(this), false );
  }
};

Autocomplete.instances = [];
Autocomplete.isDomLoaded = false;

Autocomplete.getInstance = function(id){
  var instances = Autocomplete.instances;
  var i = instances.length;
  while(i--){ if(instances[i].id === id){ return instances[i]; }}
};

Autocomplete.highlight = function(value, re){
  return value.replace(re, function(match){ return '<strong>' + match + '<\/strong>' });
};

Autocomplete.prototype = {

  killerFn: null,

  initialize: function() {
    var me = this;
    this.killerFn = function(e) {
      if (!$(Event.element(e)).up('.autocomplete')) {
        me.killSuggestions();
        me.disableKillerFn();
      }
    }.bindAsEventListener(this);

    if (!this.options.width) { this.options.width = this.el.getWidth(); }

    var div = new Element('div', { style: 'z-index:9000;position:absolute;' });
    div.update('<div class="autocomplete-w1"><div class="autocomplete-w2"><div class="autocomplete" id="Autocomplete_' + this.id + '" style="display:none; width:' + this.options.width + 'px;"></div></div></div>');

    this.options.container = $(this.options.container);
    if (this.options.container) {
      this.options.container.appendChild(div);
      this.fixPosition = function() { };
    } else {
      document.body.appendChild(div);
    }

    this.mainContainerId = div.identify();
    this.container = $('Autocomplete_' + this.id);
    this.fixPosition();

    Event.observe(this.el, 'keypress', this.onKeyPress.bind(this));
    Event.observe(this.el, 'keyup', this.onKeyUp.bind(this));
	Event.observe(this.el, 'keydown', this.onKeyDown.bind(this));
    //Event.observe(this.el, 'blur', this.hide.bind(this));
    Event.observe(this.el, 'blur', function() {
		 this.hasFocus=false;
		 setTimeout( this.hide.bind(this), 250 );
		/* this.enableKillerFn.bind(this); */
	 }.bind(this) );
    Event.observe(this.el, 'focus', function() { this.hasFocus=true; this.fixPosition.bind(this); }.bind(this) );
    this.container.setStyle({ maxHeight: this.options.maxHeight + 'px' });
    this.instanceId = Autocomplete.instances.push(this) - 1;
  },

  fixPosition: function() {
    //var offset = this.el.cumulativeOffset();
	 $(this.mainContainerId).clonePosition( this.el , { setHeight: false, offsetTop: this.el.getHeight() } );
    //$(this.mainContainerId).setStyle({ top: (offset.top + this.el.getHeight()) + 'px', left: offset.left + 'px' });
  },

  enableKillerFn: function() {
    Event.observe(document.body, 'click', this.killerFn);
  },

  disableKillerFn: function() {
    Event.stopObserving(document.body, 'click', this.killerFn);
  },

  killSuggestions: function() {
    this.stopKillSuggestions();
    this.intervalId = window.setInterval(function() { this.hide(); this.stopKillSuggestions(); } .bind(this), 300);
  },

  stopKillSuggestions: function() {
    window.clearInterval(this.intervalId);
  },

  onKeyPress: function(e) {
    if (!this.enabled) { return; }
    // return will exit the function
    // and event will not fire
    switch (e.keyCode) {
      case Event.KEY_TAB:
	  	// Event.stop(e);
      case Event.KEY_RETURN:
        if (this.selectedIndex === -1) {
			 this.selectedIndex=0;			  
			/*
			this.hide();
			if ( $('isSearch') ) $('isSearch').value = 0; 
			if ( $('isCity') )  $('isCity').value = 0;
          return;*/
        }
			if ( $('isSearch') )  $('isSearch').value = 0; 
			if ( $('isCity') )  $('isCity').value = 0;
        this.select(this.selectedIndex);
        if (e.keyCode === Event.KEY_TAB) { this.hide(); return; }
        break;
      case Event.KEY_UP:
        break;
      case Event.KEY_DOWN:
        break;
      default:
        return;
    }
    Event.stop(e);
  },
  
    onKeyDown: function(e) {
    if (!this.enabled) { return; }
    // return will exit the function
    // and event will not fire
    switch (e.keyCode) {
      case Event.KEY_TAB:
	  	// Event.stop(e);
      default:
        return;
    }
    Event.stop(e);
  },

  onKeyUp: function(e) {
    switch (e.keyCode) {
      case Event.KEY_ESC:
        this.el.value = this.currentValue;
        this.hide();
        break;
      case Event.KEY_TAB:
	  		// Event.stop(e);			
      case Event.KEY_RETURN:
        if (this.selectedIndex === -1) {
			  // this.selectedIndex=0;
			/*
			this.hide();
			if ( $('isSearch') ) $('isSearch').value = 0; 
			if ( $('isCity') )  $('isCity').value = 0;
          return;*/
        }
			if ( $('isSearch') )  $('isSearch').value = 0; 
			if ( $('isCity') )  $('isCity').value = 0;
        this.select(this.selectedIndex);
        if (e.keyCode === Event.KEY_TAB) { this.hide(); return; }
        break;
      case Event.KEY_UP:
        this.moveUp();
        return;
      case Event.KEY_DOWN:
        this.moveDown();
        return;
    }
    clearInterval(this.onChangeInterval);
    if (this.currentValue !== this.el.value) {
      if (this.options.deferRequestBy > 0) {
        // Defer lookup in case when value changes very quickly:
        this.onChangeInterval = setInterval((function() {
          this.onValueChange();
        }).bind(this), this.options.deferRequestBy);
      } else {
        this.onValueChange();
      }
    }
  },

  onValueChange: function() {
    clearInterval(this.onChangeInterval);
    this.currentValue = this.el.value;
    // this.selectedIndex = -1;
	 this.selectedIndex = 0;
    if (this.ignoreValueChange) {
      this.ignoreValueChange = false;
      return;
    }
    if (this.currentValue === '' || this.currentValue.length < this.options.minChars) {
      this.hide();
    } else {
      this.getSuggestions();
    }
  },
  
  nonAjaxServiceCall: function( url, params, callback ) {
		var cn = 'realoms_callback_'+window.realoms_callbacks++;
		window[cn] = callback;
		var real_data_Url = url+'?type=script&callback='+cn+'&'+params;
		
		var scr = document.createElement('script'); scr.src = real_data_Url;
		document.documentElement.firstChild.appendChild(scr);
	},
	
	getSuggestions: function() {
    var cr = this.cachedResponse[ $F( this.options.extraField )+'_'+ this.currentValue ];
    if (cr && Object.isArray(cr.suggestions)) {
      this.suggestions = cr.suggestions;
      this.data = cr.data;
      this.suggest();
    } else if (!this.isBadQuery(this.currentValue)) {
		 if ( this.options.useAjax ) {
			new Ajax.Request(this.serviceUrl, {
			  parameters: { query: this.currentValue , extra: $F( this.options.extraField ) },
			  onComplete: this.processResponse.bind(this),
			  method: 'get'
			});
		 }
		 else
		 {
			this.nonAjaxServiceCall( this.serviceUrl, 'query='+encodeURIComponent( this.currentValue )+'&extra='+encodeURIComponent( $F( this.options.extraField ) ), this.processResponse.bind(this) );
		 }
    }
  },

  isBadQuery: function(q) {
    var i = this.badQueries.length;
    while (i--) {
      if (q.indexOf(this.badQueries[i]) === 0) { return true; }
    }
    return false;
  },

  hide: function() {
    this.enabled = false;
    this.selectedIndex = -1;
    this.container.hide();
  },

  suggest: function() {
    if (this.suggestions.length === 0) {
      this.hide();
      return;
    }
    var content = [];
	 try {
		 var re = new RegExp('\\b' + this.currentValue.match(/\w+/g).join('|\\b'), 'gi');
	 } catch( err ) { }
	 
	 var M = [];
	 var vSel = 0;
    this.suggestions.each(function(value, i) {
		if ( M = /^[~][|][~](.+)[~][|][~]$/.exec( value ) )
		{
			content.push( '<div class="autoCompleteHeader">'+M[1]+'</div>');
		}
		else
		{
			var display = this.morethanone ? value.replace( /^.+,/, '' ) : value;
			content.push((this.selectedIndex === vSel ? '<div class="selected"' : '<div'), ' title="', value, '" onclick="Autocomplete.instances[', this.instanceId, '].select(', vSel, ');" onmouseover="Autocomplete.instances[', this.instanceId, '].activate(', vSel++, ');">', Autocomplete.highlight(display, re), '</div>');
		}
    } .bind(this));
    this.enabled = true;
	 this.fixPosition();
    this.ListNodes = [];
	 this.container.update(content.join('')).show();
	 var lx = this;;
	 
	 this.VisibleSuggestions = [];
	 for ( var t = 0; t< this.suggestions.length; t++ )
	 {
		 var val = this.suggestions[t];
		 if ( ! /^[~][|][~](.+)[~][|][~]$/.exec( val ) )
		 {
			 this.VisibleSuggestions.push( val );
		 }
	 };
	 
	 this.container.select('div').each( function( d ) {
		 if ( ! d.hasClassName('autoCompleteHeader') ) lx.ListNodes.push( d );
	 } );
  },

  processResponse: function(xhr) {
    var response;
	 if ( this.options.useAjax )
	 {
		 try {
			response = xhr.responseText.evalJSON();
			if (!Object.isArray(response.data)) { response.data = []; }
		 } catch (err) { return; }
	 }
	 else
		response = xhr;
	
    this.suggestions = response.suggestions;
    this.data = response.data;
    this.cachedResponse[ response.query ] = response;
    if (response.suggestions.length === 0) { this.badQueries.push(response.query); }
    if (response.query === $F( this.options.extraField ) +'_'+ this.currentValue) { if ( this.hasFocus ) this.suggest(); }
  },

  activate: function(index) {
    var divs = this.ListNodes; //container.childNodes;
    var activeItem;
    // Clear previous selection:
    if (this.selectedIndex !== -1 && divs.length > this.selectedIndex) {
      divs[this.selectedIndex].className = '';
    }
    this.selectedIndex = index;
    if (this.selectedIndex !== -1 && divs.length > this.selectedIndex) {
      activeItem = divs[this.selectedIndex]
      activeItem.className = 'selected';
    }
    return activeItem;
  },

  deactivate: function(div, index) {
    div.className = '';
    if (this.selectedIndex === index) { this.selectedIndex = -1; }
  },

  select: function(i) {
    var selectedValue = this.VisibleSuggestions[i];
    if (selectedValue) {
      this.el.value = selectedValue;
      if (this.options.autoSubmit && this.el.form) {
        this.el.form.submit();
      }
      this.ignoreValueChange = true;
      this.hide();
      this.onSelect(i);
    }
  },

  moveUp: function() {
    if (this.selectedIndex === -1) { return; }
    if (this.selectedIndex === 0) {
      this.ListNodes[0].className = '';
      this.selectedIndex = -1;
      this.el.value = this.currentValue;
      return;
    }
    this.adjustScroll(this.selectedIndex - 1);
  },

  moveDown: function() {
    if (this.selectedIndex === (this.VisibleSuggestions.length - 1)) { return; }
    this.adjustScroll(this.selectedIndex + 1);
  },

  adjustScroll: function(i) {
    var container = this.container;
    var activeItem = this.activate(i);
    var offsetTop = activeItem.offsetTop;
    var upperBound = container.scrollTop;
    var lowerBound = upperBound + this.options.maxHeight - 25;
    if (offsetTop < upperBound) {
      container.scrollTop = offsetTop;
    } else if (offsetTop > lowerBound) {
      container.scrollTop = offsetTop - this.options.maxHeight + 25;
    }
    this.el.value = this.VisibleSuggestions[i];
  },

  onSelect: function(i) {
    (this.options.onSelect || Prototype.emptyFunction)(this.VisibleSuggestions[i], this.data[i]);
  }

};

Event.observe( window , 'load', function(){ Autocomplete.isDomLoaded = true; }, false);