/**
 * @fileOverview 插件封装
 * @author fei.hong <hf@yoho.cn>
 * @date 2012-10-12
 */
define('lib/util/jquery.autocomplete', ["jquery"], function(require)
{
	
	var $ = require("jquery");
	
	/*
	 * jQuery Autocomplete plugin 1.1
	 *
	 * Copyright (c) 2009 Jörn Zaefferer
	 *
	 * Dual licensed under the MIT and GPL licenses:
	 *   http://www.opensource.org/licenses/mit-license.php
	 *   http://www.gnu.org/licenses/gpl.html
	 *
	 * Revision: $Id: jquery.autocomplete.js 15 2009-08-22 10:30:27Z joern.zaefferer $
	 */
	$.fn.extend
	({
		autocomplete: function(urlOrData, options) {
			var isUrl = typeof urlOrData == "string";
			options = $.extend({}, $.Autocompleter.defaults, {
				url: isUrl ? urlOrData : null,
				data: isUrl ? null : urlOrData,
				delay: isUrl ? $.Autocompleter.defaults.delay : 10,
				max: options && !options.scroll ? 10 : 150
			}, options);
			
			// if highlight is set to false, replace it with a do-nothing function
			options.highlight = options.highlight || function(value) { return value; };
			
			// if the formatMatch option is not specified, then use formatItem for backwards compatibility
			options.formatMatch = options.formatMatch || options.formatItem;
			
			return this.each(function() {
				new $.Autocompleter(this, options);
			});
		},
		result: function(handler) {
			return this.bind("result", handler);
		},
		search: function(handler) {
			return this.trigger("search", [handler]);
		},
		flushCache: function() {
			return this.trigger("flushCache");
		},
		setOptions: function(options){
			return this.trigger("setOptions", [options]);
		},
		unautocomplete: function() {
			return this.trigger("unautocomplete");
		}
	});
	
	$.Autocompleter = function(input, options) 
	{
	
		var KEY = {
			UP: 38,
			DOWN: 40,
			DEL: 46,
			TAB: 9,
			RETURN: 13,
			ESC: 27,
			COMMA: 188,
			PAGEUP: 33,
			PAGEDOWN: 34,
			BACKSPACE: 8
		};
	
		// Create $ object for input element
		var $input = $(input).attr("autocomplete", "off").addClass(options.inputClass);
	
		var timeout;
		var previousValue = "";
		var cache = $.Autocompleter.Cache(options);
		var hasFocus = 0;
		var lastKeyPressCode;
		var config = {
			mouseDownOnSelect: false
		};
		var select = $.Autocompleter.Select(options, input, selectCurrent, config);
		
		var blockSubmit;
		
		// prevent form submit in opera when selecting with return key
		$.browser.opera && $(input.form).bind("submit.autocomplete", function() {
			if (blockSubmit) {
				blockSubmit = false;
				return false;
			}
		});
		
		// only opera doesn't trigger keydown multiple times while pressed, others don't work with keypress at all
		$input.bind(($.browser.opera ? "keypress" : "keydown") + ".autocomplete", function(event) {
			// a keypress means the input has focus
			// avoids issue where input had focus before the autocomplete was applied
			hasFocus = 1;
			// track last key pressed
			lastKeyPressCode = event.keyCode;
			switch(event.keyCode) {
			
				case KEY.UP:
					event.preventDefault();
					if ( select.visible() ) {
						select.prev();
					} else {
						onChange(0, true);
					}
					break;
					
				case KEY.DOWN:
					event.preventDefault();
					if ( select.visible() ) {
						select.next();
					} else {
						onChange(0, true);
					}
					break;
					
				case KEY.PAGEUP:
					event.preventDefault();
					if ( select.visible() ) {
						select.pageUp();
					} else {
						onChange(0, true);
					}
					break;
					
				case KEY.PAGEDOWN:
					event.preventDefault();
					if ( select.visible() ) {
						select.pageDown();
					} else {
						onChange(0, true);
					}
					break;
				
				// matches also semicolon
				case options.multiple && $.trim(options.multipleSeparator) == "," && KEY.COMMA:
				case KEY.TAB:
				case KEY.RETURN:
					if( selectCurrent() ) {
						// stop default to prevent a form submit, Opera needs special handling
						event.preventDefault();
						blockSubmit = true;
						return false;
					}
					break;
					
				case KEY.ESC:
					select.hide();
					break;
					
				default:
					clearTimeout(timeout);
					timeout = setTimeout(onChange, options.delay);
					break;
			}
		}).focus(function(){
			// track whether the field has focus, we shouldn't process any
			// results if the field no longer has focus
			hasFocus++;
		}).blur(function() {
			hasFocus = 0;
			if (!config.mouseDownOnSelect) {
				hideResults();
			}
		}).click(function() {
			// show select when clicking in a focused field
			if ( hasFocus++ > 1 && !select.visible() ) {
				onChange(0, true);
			}
		}).bind("search", function() {
			// TODO why not just specifying both arguments?
			var fn = (arguments.length > 1) ? arguments[1] : null;
			function findValueCallback(q, data) {
				var result;
				if( data && data.length ) {
					for (var i=0; i < data.length; i++) {
						if( data[i].result.toLowerCase() == q.toLowerCase() ) {
							result = data[i];
							break;
						}
					}
				}
				if( typeof fn == "function" ) fn(result);
				else $input.trigger("result", result && [result.data, result.value]);
			}
			$.each(trimWords($input.val()), function(i, value) {
				request(value, findValueCallback, findValueCallback);
			});
		}).bind("flushCache", function() {
			cache.flush();
		}).bind("setOptions", function() {
			$.extend(options, arguments[1]);
			// if we've updated the data, repopulate
			if ( "data" in arguments[1] )
				cache.populate();
		}).bind("unautocomplete", function() {
			select.unbind();
			$input.unbind();
			$(input.form).unbind(".autocomplete");
		});
		
		
		function selectCurrent() {
			var selected = select.selected();
			if( !selected )
				return false;
			
			var v = selected.result;
			previousValue = v;
			
			if ( options.multiple ) {
				var words = trimWords($input.val());
				if ( words.length > 1 ) {
					var seperator = options.multipleSeparator.length;
					var cursorAt = $(input).selection().start;
					var wordAt, progress = 0;
					$.each(words, function(i, word) {
						progress += word.length;
						if (cursorAt <= progress) {
							wordAt = i;
							return false;
						}
						progress += seperator;
					});
					words[wordAt] = v;
					// TODO this should set the cursor to the right position, but it gets overriden somewhere
					//$.Autocompleter.Selection(input, progress + seperator, progress + seperator);
					v = words.join( options.multipleSeparator );
				}
				v += options.multipleSeparator;
			}
			
			$input.val(v);
			hideResultsNow();
			$input.trigger("result", [selected.data, selected.value]);
			return true;
		}
		
		function onChange(crap, skipPrevCheck) {
			if( lastKeyPressCode == KEY.DEL ) {
				select.hide();
				return;
			}
			
			var currentValue = $input.val();
			
			if ( !skipPrevCheck && currentValue == previousValue )
				return;
			
			previousValue = currentValue;
			
			currentValue = lastWord(currentValue);
			if ( currentValue.length >= options.minChars) {
				$input.addClass(options.loadingClass);
				if (!options.matchCase)
					currentValue = currentValue.toLowerCase();
				request(currentValue, receiveData, hideResultsNow);
			} else {
				stopLoading();
				select.hide();
			}
		};
		
		function trimWords(value) {
			if (!value)
				return [""];
			if (!options.multiple)
				return [$.trim(value)];
			return $.map(value.split(options.multipleSeparator), function(word) {
				return $.trim(value).length ? $.trim(word) : null;
			});
		}
		
		function lastWord(value) {
			if ( !options.multiple )
				return value;
			var words = trimWords(value);
			if (words.length == 1) 
				return words[0];
			var cursorAt = $(input).selection().start;
			if (cursorAt == value.length) {
				words = trimWords(value)
			} else {
				words = trimWords(value.replace(value.substring(cursorAt), ""));
			}
			return words[words.length - 1];
		}
		
		// fills in the input box w/the first match (assumed to be the best match)
		// q: the term entered
		// sValue: the first matching result
		function autoFill(q, sValue){
			// autofill in the complete box w/the first match as long as the user hasn't entered in more data
			// if the last user key pressed was backspace, don't autofill
			if( options.autoFill && (lastWord($input.val()).toLowerCase() == q.toLowerCase()) && lastKeyPressCode != KEY.BACKSPACE ) {
				// fill in the value (keep the case the user has typed)
				$input.val($input.val() + sValue.substring(lastWord(previousValue).length));
				// select the portion of the value not typed by the user (so the next character will erase)
				$(input).selection(previousValue.length, previousValue.length + sValue.length);
			}
		};
	
		function hideResults() {
			clearTimeout(timeout);
			timeout = setTimeout(hideResultsNow, 200);
		};
	
		function hideResultsNow() {
			var wasVisible = select.visible();
			select.hide();
			clearTimeout(timeout);
			stopLoading();
			if (options.mustMatch) {
				// call search and run callback
				$input.search(
					function (result){
						// if no value found, clear the input box
						if( !result ) {
							if (options.multiple) {
								var words = trimWords($input.val()).slice(0, -1);
								$input.val( words.join(options.multipleSeparator) + (words.length ? options.multipleSeparator : "") );
							}
							else {
								$input.val( "" );
								$input.trigger("result", null);
							}
						}
					}
				);
			}
		};
	
		function receiveData(q, data) {
			if ( data && data.length && hasFocus ) {
				stopLoading();
				select.display(data, q);
				autoFill(q, data[0].value);
				select.show();
			} else {
				hideResultsNow();
			}
		};
	
		function request(term, success, failure) {
			if (!options.matchCase)
				term = term.toLowerCase();
			var data = cache.load(term);
			// recieve the cached data
			if (data && data.length) {
				success(term, data);
			// if an AJAX url has been supplied, try loading the data now
			} else if( (typeof options.url == "string") && (options.url.length > 0) ){
				
				var extraParams = {
					timestamp: +new Date()
				};
				$.each(options.extraParams, function(key, param) {
					extraParams[key] = typeof param == "function" ? param() : param;
				});
				
				$.ajax({
					// try to leverage ajaxQueue plugin to abort previous requests
					mode: "abort",
					// limit abortion to this input
					port: "autocomplete" + input.name,
					dataType: options.dataType,
					url: options.url,
					data: $.extend({
						q: lastWord(term),
						limit: options.max
					}, extraParams),
					success: function(data) {
						var parsed = options.parse && options.parse(data) || parse(data);
						cache.add(term, parsed);
						success(term, parsed);
					}
				});
			} else {
				// if we have a failure, we need to empty the list -- this prevents the the [TAB] key from selecting the last successful match
				select.emptyList();
				failure(term);
			}
		};
		
		function parse(data) {
			var parsed = [];
			var rows = data.split("\n");
			for (var i=0; i < rows.length; i++) {
				var row = $.trim(rows[i]);
				if (row) {
					row = row.split("|");
					parsed[parsed.length] = {
						data: row,
						value: row[0],
						result: options.formatResult && options.formatResult(row, row[0]) || row[0]
					};
				}
			}
			return parsed;
		};
	
		function stopLoading() {
			$input.removeClass(options.loadingClass);
		};
	
	};
	
	$.Autocompleter.defaults = 
	{
		inputClass: "ac_input",
		resultsClass: "ac_results",
		loadingClass: "ac_loading",
		minChars: 1,
		delay: 400,
		matchCase: false,
		matchSubset: true,
		matchContains: false,
		cacheLength: 10,
		max: 100,
		mustMatch: false,
		extraParams: {},
		selectFirst: true,
		formatItem: function(row) { return row[0]; },
		formatMatch: null,
		autoFill: false,
		width: 0,
		multiple: false,
		multipleSeparator: ", ",
		highlight: function(value, term) {
			return value.replace(new RegExp("(?![^&;]+;)(?!<[^<>]*)(" + term.replace(/([\^\$\(\)\[\]\{\}\*\.\+\?\|\\])/gi, "\\$1") + ")(?![^<>]*>)(?![^&;]+;)", "gi"), "<strong>$1</strong>");
		},
	    scroll: true,
	    scrollHeight: 180
	};
	
	$.Autocompleter.Cache = function(options) 
	{
	
		var data = {};
		var length = 0;
		
		function matchSubset(s, sub) {
			if (!options.matchCase) 
				s = s.toLowerCase();
			var i = s.indexOf(sub);
			if (options.matchContains == "word"){
				i = s.toLowerCase().search("\\b" + sub.toLowerCase());
			}
			if (i == -1) return false;
			return i == 0 || options.matchContains;
		};
		
		function add(q, value) {
			if (length > options.cacheLength){
				flush();
			}
			if (!data[q]){ 
				length++;
			}
			data[q] = value;
		}
		
		function populate(){
			if( !options.data ) return false;
			// track the matches
			var stMatchSets = {},
				nullData = 0;
	
			// no url was specified, we need to adjust the cache length to make sure it fits the local data store
			if( !options.url ) options.cacheLength = 1;
			
			// track all options for minChars = 0
			stMatchSets[""] = [];
			
			// loop through the array and create a lookup structure
			for ( var i = 0, ol = options.data.length; i < ol; i++ ) {
				var rawValue = options.data[i];
				// if rawValue is a string, make an array otherwise just reference the array
				rawValue = (typeof rawValue == "string") ? [rawValue] : rawValue;
				
				var value = options.formatMatch(rawValue, i+1, options.data.length);
				if ( value === false )
					continue;
					
				var firstChar = value.charAt(0).toLowerCase();
				// if no lookup array for this character exists, look it up now
				if( !stMatchSets[firstChar] ) 
					stMatchSets[firstChar] = [];
	
				// if the match is a string
				var row = {
					value: value,
					data: rawValue,
					result: options.formatResult && options.formatResult(rawValue) || value
				};
				
				// push the current match into the set list
				stMatchSets[firstChar].push(row);
	
				// keep track of minChars zero items
				if ( nullData++ < options.max ) {
					stMatchSets[""].push(row);
				}
			};
	
			// add the data items to the cache
			$.each(stMatchSets, function(i, value) {
				// increase the cache size
				options.cacheLength++;
				// add to the cache
				add(i, value);
			});
		}
		
		// populate any existing data
		setTimeout(populate, 25);
		
		function flush(){
			data = {};
			length = 0;
		}
		
		return {
			flush: flush,
			add: add,
			populate: populate,
			load: function(q) {
				if (!options.cacheLength || !length)
					return null;
				/* 
				 * if dealing w/local data and matchContains than we must make sure
				 * to loop through all the data collections looking for matches
				 */
				if( !options.url && options.matchContains ){
					// track all matches
					var csub = [];
					// loop through all the data grids for matches
					for( var k in data ){
						// don't search through the stMatchSets[""] (minChars: 0) cache
						// this prevents duplicates
						if( k.length > 0 ){
							var c = data[k];
							$.each(c, function(i, x) {
								// if we've got a match, add it to the array
								if (matchSubset(x.value, q)) {
									csub.push(x);
								}
							});
						}
					}				
					return csub;
				} else 
				// if the exact item exists, use it
				if (data[q]){
					return data[q];
				} else
				if (options.matchSubset) {
					for (var i = q.length - 1; i >= options.minChars; i--) {
						var c = data[q.substr(0, i)];
						if (c) {
							var csub = [];
							$.each(c, function(i, x) {
								if (matchSubset(x.value, q)) {
									csub[csub.length] = x;
								}
							});
							return csub;
						}
					}
				}
				return null;
			}
		};
	};
	
	$.Autocompleter.Select = function (options, input, select, config) 
	{
		var CLASSES = {
			ACTIVE: "ac_over"
		};
		
		var listItems,
			active = -1,
			data,
			term = "",
			needsInit = true,
			element,
			list;
		
		// Create results
		function init() {
			if (!needsInit)
				return;
			element = $("<div/>")
			.hide()
			.addClass(options.resultsClass)
			.css("position", "absolute")
			.appendTo(document.body);
		
			list = $("<ul/>").appendTo(element).mouseover( function(event) {
				if(target(event).nodeName && target(event).nodeName.toUpperCase() == 'LI') {
		            active = $("li", list).removeClass(CLASSES.ACTIVE).index(target(event));
				    $(target(event)).addClass(CLASSES.ACTIVE);            
		        }
			}).click(function(event) {
				$(target(event)).addClass(CLASSES.ACTIVE);
				select();
				// TODO provide option to avoid setting focus again after selection? useful for cleanup-on-focus
				input.focus();
				return false;
			}).mousedown(function() {
				config.mouseDownOnSelect = true;
			}).mouseup(function() {
				config.mouseDownOnSelect = false;
			});
			
			if( options.width > 0 )
				element.css("width", options.width);
				
			needsInit = false;
		} 
		
		function target(event) {
			var element = event.target;
			while(element && element.tagName != "LI")
				element = element.parentNode;
			// more fun with IE, sometimes event.target is empty, just ignore it then
			if(!element)
				return [];
			return element;
		}
	
		function moveSelect(step) {
			listItems.slice(active, active + 1).removeClass(CLASSES.ACTIVE);
			movePosition(step);
	        var activeItem = listItems.slice(active, active + 1).addClass(CLASSES.ACTIVE);
	        if(options.scroll) {
	            var offset = 0;
	            listItems.slice(0, active).each(function() {
					offset += this.offsetHeight;
				});
	            if((offset + activeItem[0].offsetHeight - list.scrollTop()) > list[0].clientHeight) {
	                list.scrollTop(offset + activeItem[0].offsetHeight - list.innerHeight());
	            } else if(offset < list.scrollTop()) {
	                list.scrollTop(offset);
	            }
	        }
		};
		
		function movePosition(step) {
			active += step;
			if (active < 0) {
				active = listItems.size() - 1;
			} else if (active >= listItems.size()) {
				active = 0;
			}
		}
		
		function limitNumberOfItems(available) {
			return options.max && options.max < available
				? options.max
				: available;
		}
		
		function fillList() {
			list.empty();
			var max = limitNumberOfItems(data.length);
			for (var i=0; i < max; i++) {
				if (!data[i])
					continue;
				var formatted = options.formatItem(data[i].data, i+1, max, data[i].value, term);
				if ( formatted === false )
					continue;
				var li = $("<li/>").html( options.highlight(formatted, term) ).addClass(i%2 == 0 ? "ac_even" : "ac_odd").appendTo(list)[0];
				$.data(li, "ac_data", data[i]);
			}
			listItems = list.find("li");
			if ( options.selectFirst ) {
				listItems.slice(0, 1).addClass(CLASSES.ACTIVE);
				active = 0;
			}
			// apply bgiframe if available
			if ( $.fn.bgiframe )
				list.bgiframe();
		}
		
		return {
			display: function(d, q) {
				init();
				data = d;
				term = q;
				fillList();
			},
			next: function() {
				moveSelect(1);
			},
			prev: function() {
				moveSelect(-1);
			},
			pageUp: function() {
				if (active != 0 && active - 8 < 0) {
					moveSelect( -active );
				} else {
					moveSelect(-8);
				}
			},
			pageDown: function() {
				if (active != listItems.size() - 1 && active + 8 > listItems.size()) {
					moveSelect( listItems.size() - 1 - active );
				} else {
					moveSelect(8);
				}
			},
			hide: function() {
				element && element.hide();
				listItems && listItems.removeClass(CLASSES.ACTIVE);
				active = -1;
			},
			visible : function() {
				return element && element.is(":visible");
			},
			current: function() {
				return this.visible() && (listItems.filter("." + CLASSES.ACTIVE)[0] || options.selectFirst && listItems[0]);
			},
			show: function() {
				var offset = $(input).offset();
				element.css({
					width: typeof options.width == "string" || options.width > 0 ? options.width : $(input).width(),
					top: offset.top + input.offsetHeight,
					left: offset.left
				}).show();
	            if(options.scroll) {
	                list.scrollTop(0);
	                list.css({
						maxHeight: options.scrollHeight,
						overflow: 'auto'
					});
					
	                if($.browser.msie && typeof document.body.style.maxHeight === "undefined") {
						var listHeight = 0;
						listItems.each(function() {
							listHeight += this.offsetHeight;
						});
						var scrollbarsVisible = listHeight > options.scrollHeight;
	                    list.css('height', scrollbarsVisible ? options.scrollHeight : listHeight );
						if (!scrollbarsVisible) {
							// IE doesn't recalculate width when scrollbar disappears
							listItems.width( list.width() - parseInt(listItems.css("padding-left")) - parseInt(listItems.css("padding-right")) );
						}
	                }
	                
	            }
			},
			selected: function() {
				var selected = listItems && listItems.filter("." + CLASSES.ACTIVE).removeClass(CLASSES.ACTIVE);
				return selected && selected.length && $.data(selected[0], "ac_data");
			},
			emptyList: function (){
				list && list.empty();
			},
			unbind: function() {
				element && element.remove();
			}
		};
	};
	
	$.fn.selection = function(start, end) 
	{
		if (start !== undefined) {
			return this.each(function() {
				if( this.createTextRange ){
					var selRange = this.createTextRange();
					if (end === undefined || start == end) {
						selRange.move("character", start);
						selRange.select();
					} else {
						selRange.collapse(true);
						selRange.moveStart("character", start);
						selRange.moveEnd("character", end);
						selRange.select();
					}
				} else if( this.setSelectionRange ){
					this.setSelectionRange(start, end);
				} else if( this.selectionStart ){
					this.selectionStart = start;
					this.selectionEnd = end;
				}
			});
		}
		var field = this[0];
		if ( field.createTextRange ) {
			var range = document.selection.createRange(),
				orig = field.value,
				teststring = "<->",
				textLength = range.text.length;
			range.text = teststring;
			var caretAt = field.value.indexOf(teststring);
			field.value = orig;
			this.selection(caretAt, caretAt + textLength);
			return {
				start: caretAt,
				end: caretAt + textLength
			};
		} else if( field.selectionStart !== undefined ){
			return {
				start: field.selectionStart,
				end: field.selectionEnd
			};
		}
	};

});