/*!
 * jQuery UI Autocomplete @VERSION
 *
 * Copyright 2012, AUTHORS.txt (http://jqueryui.com/about)
 * Dual licensed under the MIT or GPL Version 2 licenses.
 * http://jquery.org/license
 *
 * http://docs.jquery.com/UI/Autocomplete
 *
 * Depends:
 *	jquery.ui.core.js
 *	jquery.ui.widget.js
 *	jquery.ui.position.js
 *	jquery.ui.menu.js
 */
(function( $, undefined ) {

// used to prevent race conditions with remote data sources
var requestIndex = 0;

$.widget( "ui.autocomplete", {
	version: "@VERSION",
	defaultElement: "<input>",
	options: {
		appendTo: "body",
		autoFocus: false,
		delay: 300,
		minLength: 1,
		position: {
			my: "left top",
			at: "left bottom",
			collision: "none"
		},
		source: null,

		// callbacks
		change: null,
		close: null,
		focus: null,
		open: null,
		response: null,
		search: null,
		select: null
	},

	pending: 0,

	_create: function() {
		var self = this,
			// Some browsers only repeat keydown events, not keypress events,
			// so we use the suppressKeyPress flag to determine if we've already
			// handled the keydown event. #7269
			// Unfortunately the code for & in keypress is the same as the up arrow,
			// so we use the suppressKeyPressRepeat flag to avoid handling keypress
			// events when we know the keydown event was used to modify the
			// search term. #7799
			suppressKeyPress,
			suppressKeyPressRepeat,
			suppressInput;

		this.isMultiLine = this.element.is( "textarea,[contenteditable]" );
		this.valueMethod = this.element[ this.element.is( "input,textarea" ) ? "val" : "text" ];

		this.element
			.addClass( "ui-autocomplete-input" )
			.attr( "autocomplete", "off" )
			// TODO verify these actually work as intended
			.attr({
				role: "textbox",
				"aria-autocomplete": "list",
				"aria-haspopup": "true"
			})
			.bind( "keydown.autocomplete", function( event ) {
				if ( self.options.disabled || self.element.prop( "readOnly" ) ) {
					suppressKeyPress = true;
					suppressInput = true;
					suppressKeyPressRepeat = true;
					return;
				}

				suppressKeyPress = false;
				suppressInput = false;
				suppressKeyPressRepeat = false;
				var keyCode = $.ui.keyCode;
				switch( event.keyCode ) {
				case keyCode.PAGE_UP:
					suppressKeyPress = true;
					self._move( "previousPage", event );
					break;
				case keyCode.PAGE_DOWN:
					suppressKeyPress = true;
					self._move( "nextPage", event );
					break;
				case keyCode.UP:
					suppressKeyPress = true;
					self._keyEvent( "previous", event );
					break;
				case keyCode.DOWN:
					suppressKeyPress = true;
					self._keyEvent( "next", event );
					break;
				case keyCode.ENTER:
				case keyCode.NUMPAD_ENTER:
					// when menu is open and has focus
					if ( self.menu.active ) {
						// #6055 - Opera still allows the keypress to occur
						// which causes forms to submit
						suppressKeyPress = true;
						event.preventDefault();
						self.menu.select( event );
					}
					break;
				case keyCode.TAB:
					if ( self.menu.active ) {
						self.menu.select( event );
					}
					break;
				case keyCode.ESCAPE:
					if ( self.menu.element.is(":visible") ) {
						self._value( self.term );
						self.close( event );
						// Different browsers have different default behavior for escape
						// Single press can mean undo or clear
						// Double press in IE means clear the whole form
						event.preventDefault();
					}
					break;
				default:
					suppressKeyPressRepeat = true;
					// search timeout should be triggered before the input value is changed
					self._searchTimeout( event );
					break;
				}
			})
			.bind( "keypress.autocomplete", function( event ) {
				if ( suppressKeyPress ) {
					suppressKeyPress = false;
					event.preventDefault();
					return;
				}
				if ( suppressKeyPressRepeat ) {
					return;
				}

				// replicate some key handlers to allow them to repeat in Firefox and Opera
				var keyCode = $.ui.keyCode;
				switch( event.keyCode ) {
				case keyCode.PAGE_UP:
					self._move( "previousPage", event );
					break;
				case keyCode.PAGE_DOWN:
					self._move( "nextPage", event );
					break;
				case keyCode.UP:
					self._keyEvent( "previous", event );
					break;
				case keyCode.DOWN:
					self._keyEvent( "next", event );
					break;
				}
			})
			.bind( "input.autocomplete", function(event) {
				if ( suppressInput ) {
					suppressInput = false;
					event.preventDefault();
					return;
				}
				self._searchTimeout( event );
			})
			.bind( "focus.autocomplete", function() {
				if ( self.options.disabled ) {
					return;
				}

				self.selectedItem = null;
				self.previous = self._value();
			})
			.bind( "blur.autocomplete", function( event ) {
				if ( self.options.disabled ) {
					return;
				}

				if ( self.cancelBlur ) {
					delete self.cancelBlur;
					return;
				}

				clearTimeout( self.searching );
				self.close( event );
				self._change( event );
			});
		this._initSource();
		this.menu = $( "<ul></ul>" )
			.addClass( "ui-autocomplete" )
			.appendTo( this.document.find( this.options.appendTo || "body" )[0] )
			// prevent the close-on-blur in case of a "slow" click on the menu (long mousedown)
			.mousedown(function( event ) {
				// prevent moving focus out of the text field
				event.preventDefault();

				// IE doesn't prevent moving focus even with event.preventDefault()
				// so we set a flag to know when we should ignore the blur event
				self.cancelBlur = true;
				setTimeout(function() {
					delete self.cancelBlur;
				}, 1 );

				// clicking on the scrollbar causes focus to shift to the body
				// but we can't detect a mouseup or a click immediately afterward
				// so we have to track the next mousedown and close the menu if
				// the user clicks somewhere outside of the autocomplete
				var menuElement = self.menu.element[ 0 ];
				if ( !$( event.target ).closest( ".ui-menu-item" ).length ) {
					setTimeout(function() {
						self.document.one( 'mousedown', function( event ) {
							if ( event.target !== self.element[ 0 ] &&
								event.target !== menuElement &&
								!$.contains( menuElement, event.target ) ) {
								self.close();
							}
						});
					}, 1 );
				}
			})
			.menu({
				// custom key handling for now
				input: $(),
				focus: function( event, ui ) {
					// back compat for _renderItem using item.autocomplete, via #7810
					// TODO remove the fallback, see #8156
					var item = ui.item.data( "ui-autocomplete-item" ) || ui.item.data( "item.autocomplete" );
					if ( false !== self._trigger( "focus", event, { item: item } ) ) {
						// use value to match what will end up in the input, if it was a key event
						if ( /^key/.test(event.originalEvent.type) ) {
							self._value( item.value );
						}
					}
				},
				select: function( event, ui ) {
					// back compat for _renderItem using item.autocomplete, via #7810
					// TODO remove the fallback, see #8156
					var item = ui.item.data( "ui-autocomplete-item" ) || ui.item.data( "item.autocomplete" ),
						previous = self.previous;

					// only trigger when focus was lost (click on menu)
					if ( self.element[0] !== self.document[0].activeElement ) {
						self.element.focus();
						self.previous = previous;
						// #6109 - IE triggers two focus events and the second
						// is asynchronous, so we need to reset the previous
						// term synchronously and asynchronously :-(
						setTimeout(function() {
							self.previous = previous;
							self.selectedItem = item;
						}, 1);
					}

					if ( false !== self._trigger( "select", event, { item: item } ) ) {
						self._value( item.value );
					}
					// reset the term after the select event
					// this allows custom select handling to work properly
					self.term = self._value();

					self.close( event );
					self.selectedItem = item;
				}
			})
			.zIndex( this.element.zIndex() + 1 )
			.hide()
			.data( "menu" );

		if ( $.fn.bgiframe ) {
			 this.menu.element.bgiframe();
		}

		// turning off autocomplete prevents the browser from remembering the
		// value when navigating through history, so we re-enable autocomplete
		// if the page is unloaded before the widget is destroyed. #7790
		this._bind( this.window, {
			beforeunload: function() {
				this.element.removeAttr( "autocomplete" );
			}
		});
	},

	_destroy: function() {
		clearTimeout( this.searching );
		this.element
			.removeClass( "ui-autocomplete-input" )
			.removeAttr( "autocomplete" )
			.removeAttr( "role" )
			.removeAttr( "aria-autocomplete" )
			.removeAttr( "aria-haspopup" );
		this.menu.element.remove();
	},

	_setOption: function( key, value ) {
		this._super( key, value );
		if ( key === "source" ) {
			this._initSource();
		}
		if ( key === "appendTo" ) {
			this.menu.element.appendTo( this.document.find( value || "body" )[0] );
		}
		if ( key === "disabled" && value && this.xhr ) {
			this.xhr.abort();
		}
	},

	_initSource: function() {
		var self = this,
			array,
			url;
		if ( $.isArray(this.options.source) ) {
			array = this.options.source;
			this.source = function( request, response ) {
				response( $.ui.autocomplete.filter(array, request.term) );
			};
		} else if ( typeof this.options.source === "string" ) {
			url = this.options.source;
			this.source = function( request, response ) {
				if ( self.xhr ) {
					self.xhr.abort();
				}
				self.xhr = $.ajax({
					url: url,
					data: request,
					dataType: "json",
					success: function( data, status ) {
						response( data );
					},
					error: function() {
						response( [] );
					}
				});
			};
		} else {
			this.source = this.options.source;
		}
	},

	_searchTimeout: function( event ) {
		var self = this;
		clearTimeout( self.searching );
		self.searching = setTimeout(function() {
			// only search if the value has changed
			if ( self.term !== self._value() ) {
				self.selectedItem = null;
				self.search( null, event );
			}
		}, self.options.delay );
	},

	search: function( value, event ) {
		value = value != null ? value : this._value();

		// always save the actual value, not the one passed as an argument
		this.term = this._value();

		if ( value.length < this.options.minLength ) {
			return this.close( event );
		}

		if ( this._trigger( "search", event ) === false ) {
			return;
		}

		return this._search( value );
	},

	_search: function( value ) {
		this.pending++;
		this.element.addClass( "ui-autocomplete-loading" );
		this.cancelSearch = false;

		this.source( { term: value }, this._response() );
	},

	_response: function() {
		var that = this,
			index = ++requestIndex;

		return function( content ) {
			if ( index === requestIndex ) {
				that.__response( content );
			}

			that.pending--;
			if ( !that.pending ) {
				that.element.removeClass( "ui-autocomplete-loading" );
			}
		};
	},

	__response: function( content ) {
		if ( content ) {
			content = this._normalize( content );
		}
		this._trigger( "response", null, { content: content } );
		if ( !this.options.disabled && content && content.length && !this.cancelSearch ) {
			this._suggest( content );
			this._trigger( "open" );
		} else {
			// use ._close() instead of .close() so we don't cancel future searches
			this._close();
		}
	},

	close: function( event ) {
		this.cancelSearch = true;
		this._close( event );
	},

	_close: function( event ) {
		clearTimeout( this.closing );
		if ( this.menu.element.is(":visible") ) {
			this.menu.element.hide();
			this.menu.blur();
			this._trigger( "close", event );
		}
	},

	_change: function( event ) {
		if ( this.previous !== this._value() ) {
			this._trigger( "change", event, { item: this.selectedItem } );
		}
	},

	_normalize: function( items ) {
		// assume all items have the right format when the first item is complete
		if ( items.length && items[0].label && items[0].value ) {
			return items;
		}
		return $.map( items, function(item) {
			if ( typeof item === "string" ) {
				return {
					label: item,
					value: item
				};
			}
			return $.extend({
				label: item.label || item.value,
				value: item.value || item.label
			}, item );
		});
	},

	_suggest: function( items ) {
		var ul = this.menu.element
			.empty()
			.zIndex( this.element.zIndex() + 1 );
		this._renderMenu( ul, items );
		// TODO refresh should check if the active item is still in the dom, removing the need for a manual blur
		this.menu.blur();
		this.menu.refresh();

		// size and position menu
		ul.show();
		this._resizeMenu();
		ul.position( $.extend({
			of: this.element
		}, this.options.position ));

		if ( this.options.autoFocus ) {
			this.menu.next( new $.Event("mouseover") );
		}
	},

	_resizeMenu: function() {
		var ul = this.menu.element;
		ul.outerWidth( Math.max(
			// Firefox wraps long text (possibly a rounding bug)
			// so we add 1px to avoid the wrapping (#7513)
			ul.width( "" ).outerWidth() + 1,
			this.element.outerWidth()
		) );
	},

	_renderMenu: function( ul, items ) {
		var self = this;
		$.each( items, function( index, item ) {
			self._renderItemData( ul, item );
		});
	},

	_renderItemData: function( ul, item ) {
		return this._renderItem( ul, item ).data( "ui-autocomplete-item", item );
	},

	_renderItem: function( ul, item ) {
		return $( "<li></li>" )
			.append( $( "<a></a>" ).text( item.label ) )
			.appendTo( ul );
	},

	_move: function( direction, event ) {
		if ( !this.menu.element.is(":visible") ) {
			this.search( null, event );
			return;
		}
		if ( this.menu.isFirstItem() && /^previous/.test(direction) ||
				this.menu.isLastItem() && /^next/.test(direction) ) {
			this._value( this.term );
			this.menu.blur();
			return;
		}
		this.menu[ direction ]( event );
	},

	widget: function() {
		return this.menu.element;
	},

	_value: function( value ) {
		return this.valueMethod.apply( this.element, arguments );
	},

	_keyEvent: function( keyEvent, event ) {
		if ( !this.isMultiLine || this.menu.element.is( ":visible" ) ) {
			this._move( keyEvent, event );

			// prevents moving cursor to beginning/end of the text field in some browsers
			event.preventDefault();
		}
	}
});

$.extend( $.ui.autocomplete, {
	escapeRegex: function( value ) {
		return value.replace(/[\-\[\]{}()*+?.,\\\^$|#\s]/g, "\\$&");
	},
	filter: function(array, term) {
		var matcher = new RegExp( $.ui.autocomplete.escapeRegex(term), "i" );
		return $.grep( array, function(value) {
			return matcher.test( value.label || value.value || value );
		});
	}
});

}( jQuery ));