/**
*	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) {
		if (currentValue === 'and' || currentValue === '&' || currentValue === 'n\'') {
			var pattern = '(and|\&|n\')';
		} else {
			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.containerId = options.containerId;
    this.containerItemsId = options.containerItemsId;
		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);
	}
	
	$.fn.bh_autocomplete = function(options) {
		return new Autocomplete(this.get(0)||$('<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;
			this.mainContainerId = this.containerId;

			//$('<div class="autocomplete-container" 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.container_items = $('#'+ this.containerItemsId);
			
			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();
						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;
				$('#artist-load-spinner').show()
				$.get(this.serviceUrl, me.options.params, function(txt) {
				  me.processResponse(txt);
				  $('#artist-load-spinner').hide();
				}, '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();
			$('.popover-wrapper').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 = $('#'+ this.containerId);
			this.container_items = $('#'+ this.containerItemsId);
			this.container_items.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_items.append(div);
			}
			this.enabled = true;
			this.container.show();
			$('.popover-wrapper').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_items.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_items.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_items.scrollTop();
			lowerBound = upperBound + this.options.maxHeight - 25;
			if (offsetTop < upperBound) {
				this.container_items.scrollTop(offsetTop);
			} else if (offsetTop > lowerBound) {
				this.container_items.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));