/*
 *
 *  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/
 *  @modified Barrington
 *
 */

var Autocomplete = function(el, options){
  this.el = $(el);
  this.id = this.el.identify();
  this.el.setAttribute('autocomplete','off');
  this.suggestions = [];
  this.data = [];
  this.jsoneval = {};
  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.serviceUrl = options.serviceUrl;
  this.options = {
    autoSubmit:false,
    minChars:1,
	type:'autocomplete',
    maxHeight:300,
    deferRequestBy:0,
    width:0,
	progressloader:true,
    container:null
  };
  if(options){ Object.extend(this.options, options); }
  if(Autocomplete.isDomLoaded){
    this.initialize();
  }else{
    Event.observe(document, 'dom:loaded', 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: '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, window.opera ? 'keypress':'keydown', this.onKeyPress.bind(this));
    //Event.observe(this.el, 'keyup', this.onKeyUp.bind(this));
	
	this.el.observe('keyup', this.onKeyUp.bind(this));
    Event.observe(this.el, 'blur', this.enableKillerFn.bind(this));
    Event.observe(this.el, 'focus', this.fixPosition.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).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_ESC:
        this.el.value = this.currentValue;
        this.hide();
        break;
      case Event.KEY_TAB:
      case Event.KEY_RETURN:
        if (this.selectedIndex === -1) {
          this.hide();
          return;
        }
        this.select(this.selectedIndex);
        if (e.keyCode === Event.KEY_TAB) { return; }
        break;
      case Event.KEY_UP:
        this.moveUp();
        break;
      case Event.KEY_DOWN:
        this.moveDown();
        break;
      default:
        return;
    }
    Event.stop(e);
  },

  onKeyUp: function(e) {
	
	switch (e.keyCode) {
      case Event.KEY_UP:
      case Event.KEY_DOWN:
        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;
    if (this.ignoreValueChange) {
      this.ignoreValueChange = false;
      return;
    }
	
    if (this.currentValue === '' || this.currentValue.length < this.options.minChars) {
	  if(this.options.type == 'checkexistence'){
	  	var avail = $('avail'+this.id);
		if(avail != null){
			avail.remove();
		}
	  }
	  this.hide();
    } else {
		if (this.options.progressloader) {
			this.showProgressLoader();
		}
		
      this.getSuggestions();
    }
  },

  getSuggestions: function() {
    var cr = this.cachedResponse[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.type == 'autocomplete'){
	  		new Ajax.Request(this.serviceUrl, {
        	parameters: { query: this.currentValue },
        	onComplete: this.processResponse.bind(this),
        	method: 'get'
      	});
	  }
	  
	  if (this.options.type == 'checkexistence') {
			var operURI = '/gmasync/utils';
			var ajax_parms = {
				method: 'post',
				parameters: {
					typerequest: 'checkexistence',
					typeexist: this.id,
					value: this.currentValue
				},
				onSuccess: this.processResponse.bind(this)
			}
			new Ajax.Request(operURI,ajax_parms);
	  }

    }
  },

  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 = [];
    var re = new RegExp('\\b' + this.currentValue.match(/\w+/g).join('|\\b'), 'gi');
    this.suggestions.each(function(value, i) {
      content.push((this.selectedIndex === i ? '<div class="selected"' : '<div'), ' title="', value, '" onclick="Autocomplete.instances[', this.instanceId, '].select(', i, ');" onmouseover="Autocomplete.instances[', this.instanceId, '].activate(', i, ');">', Autocomplete.highlight(value, re), '</div>');
    } .bind(this));
    this.enabled = true;
    this.container.update(content.join('')).show();
  },

  processResponse: function(xhr) {
    var response;

    if(this.options.type == 'autocomplete'){
		try {
      		response = xhr.responseText.evalJSON();
     	 	if (!Object.isArray(response.data)) { response.data = []; }
   	 	} catch (err) { return; }
   		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 === this.currentValue) { this.suggest(); }
	}
	
	if(this.options.type == 'checkexistence'){
		try {
      		this.jsoneval = xhr.responseText.evalJSON();
     	 	
			//if (!Object.isArray(response.data)) { response.data = []; }
   	 	} catch (err) { return; }
		this.cachedResponse[this.jsoneval.query] = this.jsoneval;
		//if (response.suggestions.length === 0) { this.badQueries.push(response.query); }
		this.removeProgressLoader();
		if (this.jsoneval.query === this.currentValue) { 
			this.checkExistence();
		}
	}
	
  },

  activate: function(index) {
    var divs = this.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.suggestions[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.container.childNodes[0].className = '';
      this.selectedIndex = -1;
      this.el.value = this.currentValue;
      return;
    }
    this.adjustScroll(this.selectedIndex - 1);
  },

  moveDown: function() {
    if (this.selectedIndex === (this.suggestions.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.suggestions[i];
  },

  onSelect: function(i) {
    (this.options.onSelect || Prototype.emptyFunction)(this.suggestions[i], this.data[i]);
  },
  
  checkExistence:function(){
	
	var value = this.el.value;
	var id = this.id;

	var parent = this.el.up('body');

	
	var keywordHint = this.jsoneval.fullhtml;
	if(this.jsoneval.resp == 'exists'){
		var avail = new Element("div", { 'id':"avail"+id , 'class':"availabilityno"});
		avail.update(keywordHint);
	}else{
		var avail = new Element("div", { 'id':"avail"+id , 'class':"availabilityyes"});
		avail.update(keywordHint);
	}
	
	var cumulative = this.el.cumulativeOffset();
	var left = this.el.getWidth() + cumulative[0];
	var top = ((this.el.getHeight() - 16)/2) + cumulative[1];
	
	avail.setStyle({
		position:'absolute',
		top:top+'px',
		left:left+'px'
	});
	parent.insert({bottom:avail});
	avail = null;
								
},
	
	showProgressLoader:function(){
		var avail = $('avail'+this.id);
		if(avail != null){
			avail.remove();
		}
		
		this.removeProgressLoader();
		var parent = this.el.up('body');
		var progress = new Element("div", { 'id':"avail_progress"+this.id, 'class':"avail_progress"});
		progress.update('Checking Availability...');
		var offsetParent = this.el.getOffsetParent();
		var cumulative = this.el.cumulativeOffset();
		
		var left = this.el.getWidth() + cumulative[0];
		var top = ((this.el.getHeight() - 20)/2) + cumulative[1];
		
		progress.setStyle({
			position:'absolute',
			top:top+'px',
			left:left+'px'
		});
		
		parent.insert({bottom:progress});
		
		progress = null;
	},
	
	removeProgressLoader:function(){
		//remove ajax progress loader
		var progressElem = $('avail_progress'+this.id);
	
		if(progressElem != null){
			progressElem.remove();
		}
	}

};

Event.observe(document, 'dom:loaded', function(){ Autocomplete.isDomLoaded = true; }, false);