/**
 *  Ajax Autocomplete for jQuery, version 1.1.3
 *  (c) 2010 Tomas Kirda
 *
 *  Ajax Autocomplete for jQuery is freely distributable under the terms of an MIT-style license.
 *  For details, see the web site: http://www.devbridge.com/projects/autocomplete/jquery/
 *
 *  Last Review: 04/19/2010
 */

/*jslint onevar: true, evil: true, nomen: true, eqeqeq: true, bitwise: true, regexp: true, newcap: true, immed: true */
/*global window: true, document: true, clearInterval: true, setInterval: true, jQuery: true */

/*
 * this auto complete widget is provided by
 http://www.devbridge.com/projects/autocomplete/jquery/#howto
 */
(function($) {

	var reEscape = new RegExp('(\\' + ['/', '.', '*', '+', '?', '|', '(', ')', '[', ']', '{', '}', '\\'].join('|\\') + ')', 'g');

	function fnFormatResult(value, data, currentValue) {
		var pattern = '(' + currentValue.replace(reEscape, '\\$1') + ')';
		return value.replace(new RegExp(pattern, 'gi'), '<strong>$1<\/strong>');
	}

	function Autocomplete(el, options) {
		this.el = $(el);
		this.el.attr('autocomplete', 'off');
		this.suggestions = [];
		this.data = [];
		this.badQueries = [];
		this.selectedIndex = -1;
		this.currentValue = this.el.val();
		this.intervalId = 0;
		this.cachedResponse = [];
		this.onChangeInterval = null;
		this.ignoreValueChange = false;
		this.serviceUrl = options.serviceUrl;
		this.isLocal = false;
		this.options = {
				autoSubmit: false,
				minChars: 1,
				maxHeight: 300,
				deferRequestBy: 0,
				width: 0,
				highlight: true,
				params: {},
				fnFormatResult: fnFormatResult,
				delimiter: null,
				zIndex: 9999
		};
		this.initialize();
		this.setOptions(options);
	}

	$.fn.autocomplete = function(options) {
		return new Autocomplete(this.get(0)||$('<input />'), options);
	};


	Autocomplete.prototype = {

			killerFn: null,

			initialize: function() {

		var me, uid, autocompleteElId;
		me = this;
		uid = Math.floor(Math.random()*0x100000).toString(16);
		autocompleteElId = 'Autocomplete_' + uid;

		this.killerFn = function(e) {
			if ($(e.target).parents('.autocomplete').size() === 0) {
				me.killSuggestions();
				me.disableKillerFn();
			}
		};

		if (!this.options.width) { this.options.width = this.el.width(); }
		this.mainContainerId = 'AutocompleteContainter_' + uid;

		$('<div id="' + this.mainContainerId + '" style="position:absolute;z-index:9999;"><div class="autocomplete-w1"><div class="autocomplete" id="' + autocompleteElId + '" style="display:none; width:300px;"></div></div></div>').appendTo('body');

		this.container = $('#' + autocompleteElId);
		this.fixPosition();
		if (window.opera) {
			this.el.keypress(function(e) { me.onKeyPress(e); });
		} else {
			this.el.keydown(function(e) { me.onKeyPress(e); });
		}
		this.el.keyup(function(e) { me.onKeyUp(e); });
		this.el.blur(function() { me.enableKillerFn(); });
		this.el.focus(function() { me.fixPosition(); });
	},

	setOptions: function(options){
		var o = this.options;
		$.extend(o, options);
		if(o.lookup){
			this.isLocal = true;
			if($.isArray(o.lookup)){ o.lookup = { suggestions:o.lookup, data:[] }; }
		}
		$('#'+this.mainContainerId).css({ zIndex:o.zIndex });
		this.container.css({ maxHeight: o.maxHeight + 'px', width:o.width });
	},

	clearCache: function(){
		this.cachedResponse = [];
		this.badQueries = [];
	},

	disable: function(){
		this.disabled = true;
	},

	enable: function(){
		this.disabled = false;
	},

	fixPosition: function() {
		var offset = this.el.offset();
		$('#' + this.mainContainerId).css({ top: (offset.top + this.el.innerHeight()) + 'px', left: offset.left + 'px' });
	},

	enableKillerFn: function() {
		var me = this;
		$(document).bind('click', me.killerFn);
	},

	disableKillerFn: function() {
		var me = this;
		$(document).unbind('click', me.killerFn);
	},

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

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

	onKeyPress: function(e) {
		if (this.disabled || !this.enabled) { return; }
		// return will exit the function
		// and event will not be prevented
		switch (e.keyCode) {
		case 27: //KEY_ESC:
			this.el.val(this.currentValue);
			this.hide();
			break;
		case 9: //KEY_TAB:
		case 13: //KEY_RETURN:
			if (this.selectedIndex === -1) {
				this.hide();
	//			alert ("return");
				return;
			}
			this.select(this.selectedIndex);
			if(e.keyCode === 9){ return; }
			break;
		case 38: //KEY_UP:
			this.moveUp();
			break;
		case 40: //KEY_DOWN:
			this.moveDown();
			break;
		default:
			return;
		}
		e.stopImmediatePropagation();
		e.preventDefault();
	},

	onKeyUp: function(e) {
		if(this.disabled){ return; }
		switch (e.keyCode) {
		case 38: //KEY_UP:
		case 40: //KEY_DOWN:
			return;
		}
		clearInterval(this.onChangeInterval);
		if (this.currentValue !== this.el.val()) {
			if (this.options.deferRequestBy > 0) {
				// Defer lookup in case when value changes very quickly:
				var me = this;
				this.onChangeInterval = setInterval(function() { me.onValueChange(); }, this.options.deferRequestBy);
			} else {
				this.onValueChange();
			}
		}
	},

	onValueChange: function() {
		clearInterval(this.onChangeInterval);
		this.currentValue = this.el.val();
		var q = this.getQuery(this.currentValue);
		this.selectedIndex = -1;
		if (this.ignoreValueChange) {
			this.ignoreValueChange = false;
			return;
		}
		if (q === '' || q.length < this.options.minChars) {
			this.hide();
		} else {
			this.getSuggestions(q);
		}
	},

	getQuery: function(val) {
		var d, arr;
		d = this.options.delimiter;
		if (!d) { return $.trim(val); }
		arr = val.split(d);
		return $.trim(arr[arr.length - 1]);
	},

	getSuggestionsLocal: function(q) {
		var ret, arr, len, val, i;
		arr = this.options.lookup;
		len = arr.suggestions.length;
		ret = { suggestions:[], data:[] };
		q = q.toLowerCase();
		for(i=0; i< len; i++){
			val = arr.suggestions[i];
			if(val.toLowerCase().indexOf(q) === 0){
				ret.suggestions.push(val);
				ret.data.push(arr.data[i]);
			}
		}
		return ret;
	},

	getSuggestions: function(q) {
		var cr, me;
		cr = this.isLocal ? this.getSuggestionsLocal(q) : this.cachedResponse[q];
		if (cr && $.isArray(cr.suggestions)) {
			this.suggestions = cr.suggestions;
			this.data = cr.data;
			this.suggest();
		} else if (!this.isBadQuery(q)) {
			me = this;
			me.options.params.query = q;
			$.get(this.serviceUrl, me.options.params, function(txt) { me.processResponse(txt); }, 'text');
		}
	},

	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 me, len, div, f, v, i, s, mOver, mClick;
		me = this;
		len = this.suggestions.length;
		f = this.options.fnFormatResult;
		v = this.getQuery(this.currentValue);
		mOver = function(xi) { return function() { me.activate(xi); }; };
		mClick = function(xi) { return function() { me.select(xi); }; };
		this.container.hide().empty();
		for (i = 0; i < len; i++) {
			s = this.suggestions[i];
			div = $((me.selectedIndex === i ? '<div class="selected"' : '<div') + ' title="' + s + '">' + f(s, this.data[i], v) + '</div>');
			div.mouseover(mOver(i));
			div.click(mClick(i));
			this.container.append(div);
		}
		this.enabled = true;
		this.container.show();
	},

	processResponse: function(text) {
		var response;
		try {
			response = eval('(' + text + ')');
		} catch (err) { return; }
		if (!$.isArray(response.data)) { response.data = []; }
		if(!this.options.noCache){
			this.cachedResponse[response.query] = response;
			if (response.suggestions.length === 0) { this.badQueries.push(response.query); }
		}
		if (response.query === this.getQuery(this.currentValue)) {
			this.suggestions = response.suggestions;
			this.data = response.data;
			this.suggest(); 
		}
	},

	activate: function(index) {
		var divs, activeItem;
		divs = this.container.children();
		// Clear previous selection:
		if (this.selectedIndex !== -1 && divs.length > this.selectedIndex) {
			$(divs.get(this.selectedIndex)).removeClass();
		}
		this.selectedIndex = index;
		if (this.selectedIndex !== -1 && divs.length > this.selectedIndex) {
			activeItem = divs.get(this.selectedIndex);
			$(activeItem).addClass('selected');
		}
		return activeItem;
	},

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

	select: function(i) {
		var selectedValue, f;
		selectedValue = this.suggestions[i];
		if (selectedValue) {
			this.el.val(selectedValue);
			if (this.options.autoSubmit) {
				f = this.el.parents('form');
				if (f.length > 0) { f.get(0).submit(); }
			}
			this.ignoreValueChange = true;
			this.hide();
			this.onSelect(i);
		}
	},

	moveUp: function() {
		if (this.selectedIndex === -1) { return; }
		if (this.selectedIndex === 0) {
			this.container.children().get(0).className = '';
			this.selectedIndex = -1;
			this.el.val(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 activeItem, offsetTop, upperBound, lowerBound;
		activeItem = this.activate(i);
		offsetTop = activeItem.offsetTop;
		upperBound = this.container.scrollTop();
		lowerBound = upperBound + this.options.maxHeight - 25;
		if (offsetTop < upperBound) {
			this.container.scrollTop(offsetTop);
		} else if (offsetTop > lowerBound) {
			this.container.scrollTop(offsetTop - this.options.maxHeight + 25);
		}
		this.el.val(this.getValue(this.suggestions[i]));
	},

	onSelect: function(i) {
		var me, fn, s, d;
		me = this;
		fn = me.options.onSelect;
		s = me.suggestions[i];
		d = me.data[i];
		me.el.val(me.getValue(s));
		if ($.isFunction(fn)) { fn(s, d, me.el); }
	},

	getValue: function(value){
		var del, currVal, arr, me;
		me = this;
		del = me.options.delimiter;
		if (!del) { return value; }
		currVal = me.currentValue;
		arr = currVal.split(del);
		if (arr.length === 1) { return value; }
		return currVal.substr(0, currVal.length - arr[arr.length - 1].length) + value;
	}

	};

}(jQuery));