/**
 *  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 */

(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 = {
			method: 'get',
			autoSubmit: false,
			minChars: 1,
			maxHeight: 300,
			deferRequestBy: 0,
			width: 0,
			highlight: true,
			cssClass: '',
			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.method == 'get' || !this.options.method == 'post') {
				this.options.method = 'get';
			}
			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
			}).parent().addClass(o.cssClass);
		},

		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();
						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;
				var params = me.options.params;
				if (typeof me.options.dataFilter == "function") {
					params = $.extend({}, params, me.options.dataFilter());
				} else {
					params.query = q;
				}
				$[me.options.method](this.serviceUrl, 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();

			$("div:last", this.container).addClass("last").css("border", 0);

			this.onShow();

		},

		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');
			}

			$("div:last", this.container).addClass("last").css("border", 0);

			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);
			}
		},

		onShow: function() {
			var me, fn;
			me = this;
			fn = me.options.onShow;
			if ($.isFunction(fn)) {
				fn(me);
			}
		},

		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));