/**

*  Ajax Autocomplete for jQuery, version 1.2.4

*  (c) 2013 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/

*

*/



/*jslint  browser: true, white: true, plusplus: true */

/*global define, window, document, jQuery */



// Expose plugin as an AMD module if AMD loader is present:

(function (factory) {

    'use strict';

    if (typeof define === 'function' && define.amd) {

        // AMD. Register as an anonymous module.

        define(['jquery'], factory);

    } else {

        // Browser globals

        factory(jQuery);

    }

}(function ($) {

    'use strict';



    var

        utils = (function () {

            return {



                extend: function (target, source) {

                    return $.extend(target, source);

                },



                addEvent: function (element, eventType, handler) {

                    if (element.addEventListener) {

                        element.addEventListener(eventType, handler, false);

                    } else if (element.attachEvent) {

                        element.attachEvent('on' + eventType, handler);

                    } else {

                        throw new Error('Browser doesn\'t support addEventListener or attachEvent');

                    }

                },



                removeEvent: function (element, eventType, handler) {

                    if (element.removeEventListener) {

                        element.removeEventListener(eventType, handler, false);

                    } else if (element.detachEvent) {

                        element.detachEvent('on' + eventType, handler);

                    }

                },



                createNode: function (html) {

                    var div = document.createElement('div');

                    div.innerHTML = html;

                    return div.firstChild;

                }



            };

        }()),



        keys = {

            ESC: 27,

            TAB: 9,

            RETURN: 13,

            UP: 38,

            DOWN: 40

        };



    function Autocomplete(el, options) {

        var noop = function () { },

            that = this,

            defaults = {

                autoSelectFirst: false,

                appendTo: 'body',

                serviceUrl: null,

                lookup: null,

                onSelect: null,

                width: 'auto',

                minChars: 1,

                maxHeight: 300,

                deferRequestBy: 0,

                params: {},

                formatResult: Autocomplete.formatResult,

                delimiter: null,

                zIndex: 9999,

                type: 'GET',

                noCache: false,

                onSearchStart: noop,

                onSearchComplete: noop,

                containerClass: 'autocomplete-suggestions',

                tabDisabled: false,

                dataType: 'text',

                lookupFilter: function (suggestion, originalQuery, queryLowerCase) {

                    return suggestion.value.toLowerCase().indexOf(queryLowerCase) !== -1;

                },

                paramName: 'query',

                transformResult: function (response, originalQuery) {

                    var result = typeof response === 'string' ? $.parseJSON(response) : response;

                    result.query = originalQuery;

                    return result;

                }

            };



        // Shared variables:

        that.element = el;

        that.el = $(el);

        that.suggestions = [];

        that.badQueries = [];

        that.selectedIndex = -1;

        that.currentValue = that.element.value;

        that.intervalId = 0;

        that.cachedResponse = [];

        that.onChangeInterval = null;

        that.onChange = null;

        that.ignoreValueChange = false;

        that.isLocal = false;

        that.suggestionsContainer = null;

        that.options = $.extend({}, defaults, options);

        that.classes = {

            selected: 'autocomplete-selected',

            suggestion: 'autocomplete-suggestion'

        };



        // Initialize and set options:

        that.initialize();

        that.setOptions(options);

    }



    Autocomplete.utils = utils;



    $.Autocomplete = Autocomplete;



    Autocomplete.formatResult = function (suggestion, currentValue) {

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

            pattern = '(' + currentValue.replace(reEscape, '\\$1') + ')';



        return suggestion.value.replace(new RegExp(pattern, 'gi'), '<strong>$1<\/strong>');

    };



    Autocomplete.prototype = {



        killerFn: null,



        initialize: function () {

            var that = this,

                suggestionSelector = '.' + that.classes.suggestion,

                selected = that.classes.selected,

                options = that.options,

                container;



            // Remove autocomplete attribute to prevent native suggestions:

            that.element.setAttribute('autocomplete', 'off');



            that.killerFn = function (e) {

                if ($(e.target).closest('.' + that.options.containerClass).length === 0) {

                    that.killSuggestions();

                    that.disableKillerFn();

                }

            };



            // Determine suggestions width:

            if (!options.width || options.width === 'auto') {

                options.width = that.el.outerWidth();

            }



            that.suggestionsContainer = Autocomplete.utils.createNode('<div class="' + options.containerClass + '" style="position: absolute; display: none;"></div>');



            container = $(that.suggestionsContainer);



            container.appendTo(options.appendTo).width(options.width);



            // Listen for mouse over event on suggestions list:

            container.on('mouseover', suggestionSelector, function () {

                that.activate($(this).data('index'));

            });



            // Deselect active element when mouse leaves suggestions container:

            container.on('mouseout', function () {

                that.selectedIndex = -1;

                container.children('.' + selected).removeClass(selected);

            });



            // Listen for click event on suggestions list:

            container.on('click', suggestionSelector, function () {

                that.select($(this).data('index'), false);

            });



            that.fixPosition();



            // Opera does not like keydown:

            if (window.opera) {

                that.el.on('keypress', function (e) { that.onKeyPress(e); });

            } else {

                that.el.on('keydown', function (e) { that.onKeyPress(e); });

            }



            that.el.on('keyup', function (e) { that.onKeyUp(e); });

            that.el.on('blur', function () { that.onBlur(); });

            that.el.on('focus', function () { that.fixPosition(); });

        },



        onBlur: function () {

            this.enableKillerFn();

        },



        setOptions: function (suppliedOptions) {

            var that = this,

                options = that.options;



            utils.extend(options, suppliedOptions);



            that.isLocal = $.isArray(options.lookup);



            if (that.isLocal) {

                options.lookup = that.verifySuggestionsFormat(options.lookup);

            }



            // Adjust height, width and z-index:

            $(that.suggestionsContainer).css({

                'max-height': options.maxHeight + 'px',

                'width': options.width + 'px',

                'z-index': options.zIndex

            });

        },



        clearCache: function () {

            this.cachedResponse = [];

            this.badQueries = [];

        },



        disable: function () {

            this.disabled = true;

        },



        enable: function () {

            this.disabled = false;

        },



        fixPosition: function () {

            var that = this,

                offset;



            // Don't adjsut position if custom container has been specified:

            if (that.options.appendTo !== 'body') {

                return;

            }



            offset = that.el.offset();



            $(that.suggestionsContainer).css({

                top: (offset.top + that.el.outerHeight()) + 'px',

                left: offset.left + 'px'

            });

        },



        enableKillerFn: function () {

            var that = this;

            $(document).on('click', that.killerFn);

        },



        disableKillerFn: function () {

            var that = this;

            $(document).off('click', that.killerFn);

        },



        killSuggestions: function () {

            var that = this;

            that.stopKillSuggestions();

            that.intervalId = window.setInterval(function () {

                that.hide();

                that.stopKillSuggestions();

            }, 300);

        },



        stopKillSuggestions: function () {

            window.clearInterval(this.intervalId);

        },



        onKeyPress: function (e) {

            var that = this;



            // If suggestions are hidden and user presses arrow down, display suggestions:

            if (!that.disabled && !that.visible && e.keyCode === keys.DOWN && that.currentValue) {

                that.suggest();

                return;

            }



            if (that.disabled || !that.visible) {

                return;

            }



            switch (e.keyCode) {

                case keys.ESC:

                    that.el.val(that.currentValue);

                    that.hide();

                    break;

                case keys.TAB:

                case keys.RETURN:

                    if (that.selectedIndex === -1) {

                        that.hide();

                        return;

                    }

                    that.select(that.selectedIndex, e.keyCode === keys.RETURN);

                    if (e.keyCode === keys.TAB && this.options.tabDisabled === false) {

                        return;

                    }

                    break;

                case keys.UP:

                    that.moveUp();

                    break;

                case keys.DOWN:

                    that.moveDown();

                    break;

                default:

                    return;

            }



            // Cancel event if function did not return:

            e.stopImmediatePropagation();

            e.preventDefault();

        },



        onKeyUp: function (e) {

            var that = this;



            if (that.disabled) {

                return;

            }



            switch (e.keyCode) {

                case keys.UP:

                case keys.DOWN:

                    return;

            }



            clearInterval(that.onChangeInterval);



            if (that.currentValue !== that.el.val()) {

                if (that.options.deferRequestBy > 0) {

                    // Defer lookup in case when value changes very quickly:

                    that.onChangeInterval = setInterval(function () {

                        that.onValueChange();

                    }, that.options.deferRequestBy);

                } else {

                    that.onValueChange();

                }

            }

        },



        onValueChange: function () {

            var that = this,

                q;



            clearInterval(that.onChangeInterval);

            that.currentValue = that.element.value;



            q = that.getQuery(that.currentValue);

            that.selectedIndex = -1;



            if (that.ignoreValueChange) {

                that.ignoreValueChange = false;

                return;

            }



            if (q.length < that.options.minChars) {

                that.hide();

            } else {

                that.getSuggestions(q);

            }

        },



        getQuery: function (value) {

            var delimiter = this.options.delimiter,

                parts;



            if (!delimiter) {

                return $.trim(value);

            }

            parts = value.split(delimiter);

            return $.trim(parts[parts.length - 1]);

        },



        getSuggestionsLocal: function (query) {

            var that = this,

                queryLowerCase = query.toLowerCase(),

                filter = that.options.lookupFilter;



            return {

                suggestions: $.grep(that.options.lookup, function (suggestion) {

                    return filter(suggestion, query, queryLowerCase);

                })

            };

        },



        getSuggestions: function (q) {

            var response,

                that = this,

                options = that.options;



            response = that.isLocal ? that.getSuggestionsLocal(q) : that.cachedResponse[q];



            if (response && $.isArray(response.suggestions)) {

                that.suggestions = response.suggestions;

                that.suggest();

            } else if (!that.isBadQuery(q)) {

                //options.params[options.paramName] = q;

                options.onSearchStart.call(that.element, options.params);

                $.ajax({

                    url: options.serviceUrl+'/'+q,

                    data: options.params,

                    type: options.type,

                    dataType: options.dataType

                }).done(function (data) {

                    that.processResponse(data, q);

                    options.onSearchComplete.call(that.element, q);

                });

            }

        },



        isBadQuery: function (q) {

            var badQueries = this.badQueries,

                i = badQueries.length;



            while (i--) {

                if (q.indexOf(badQueries[i]) === 0) {

                    return true;

                }

            }



            return false;

        },



        hide: function () {

            var that = this;

            that.visible = false;

            that.selectedIndex = -1;

            $(that.suggestionsContainer).hide();

        },



        suggest: function () {

            if (this.suggestions.length === 0) {

                this.hide();

                return;

            }



            var that = this,

                formatResult = that.options.formatResult,

                value = that.getQuery(that.currentValue),

                className = that.classes.suggestion,

                classSelected = that.classes.selected,

                container = $(that.suggestionsContainer),

                html = '';



            // Build suggestions inner HTML:

            $.each(that.suggestions, function (i, suggestion) {

                html += '<div class="' + className + '" data-index="' + i + '">' + formatResult(suggestion, value) + '</div>';

            });



            container.html(html).show();

            that.visible = true;



            // Select first value by default:

            if (that.options.autoSelectFirst) {

                that.selectedIndex = 0;

                container.children().first().addClass(classSelected);

            }

        },



        verifySuggestionsFormat: function (suggestions) {

            // If suggestions is string array, convert them to supported format:

            if (suggestions.length && typeof suggestions[0] === 'string') {

                return $.map(suggestions, function (value) {

                    return { value: value, data: null };

                });

            }



            return suggestions;

        },



        processResponse: function (response, originalQuery) {

            var that = this,

                options = that.options,

                result = that.options.transformResult(response, originalQuery);



            result.suggestions = that.verifySuggestionsFormat(result.suggestions);



            // Cache results if cache is not disabled:

            if (!options.noCache) {

                that.cachedResponse[result[options.paramName]] = result;

                if (result.suggestions.length === 0) {

                    that.badQueries.push(result[options.paramName]);

                }

            }



            // Display suggestions only if returned query matches current value:

            if (result.query === that.getQuery(that.currentValue)) {

                that.suggestions = result.suggestions;

                that.suggest();

            }

        },



        activate: function (index) {

            var that = this,

                activeItem,

                selected = that.classes.selected,

                container = $(that.suggestionsContainer),

                children = container.children();



            container.children('.' + selected).removeClass(selected);



            that.selectedIndex = index;



            if (that.selectedIndex !== -1 && children.length > that.selectedIndex) {

                activeItem = children.get(that.selectedIndex);

                $(activeItem).addClass(selected);

                return activeItem;

            }



            return null;

        },



        select: function (i, shouldIgnoreNextValueChange) {

            var that = this,

                selectedValue = that.suggestions[i];



            if (selectedValue) {

                that.el.val(selectedValue);

                that.ignoreValueChange = shouldIgnoreNextValueChange;

                that.hide();

                that.onSelect(i);

            }

        },



        moveUp: function () {

            var that = this;



            if (that.selectedIndex === -1) {

                return;

            }



            if (that.selectedIndex === 0) {

                $(that.suggestionsContainer).children().first().removeClass(that.classes.selected);

                that.selectedIndex = -1;

                that.el.val(that.currentValue);

                return;

            }



            that.adjustScroll(that.selectedIndex - 1);

        },



        moveDown: function () {

            var that = this;



            if (that.selectedIndex === (that.suggestions.length - 1)) {

                return;

            }



            that.adjustScroll(that.selectedIndex + 1);

        },



        adjustScroll: function (index) {

            var that = this,

                activeItem = that.activate(index),

                offsetTop,

                upperBound,

                lowerBound,

                heightDelta = 25;



            if (!activeItem) {

                return;

            }



            offsetTop = activeItem.offsetTop;

            upperBound = $(that.suggestionsContainer).scrollTop();

            lowerBound = upperBound + that.options.maxHeight - heightDelta;



            if (offsetTop < upperBound) {

                $(that.suggestionsContainer).scrollTop(offsetTop);

            } else if (offsetTop > lowerBound) {

                $(that.suggestionsContainer).scrollTop(offsetTop - that.options.maxHeight + heightDelta);

            }



            that.el.val(that.getValue(that.suggestions[index].value));

        },



        onSelect: function (index) {

            var that = this,

                onSelectCallback = that.options.onSelect,

                suggestion = that.suggestions[index];



            that.el.val(that.getValue(suggestion.value));



            if ($.isFunction(onSelectCallback)) {

                onSelectCallback.call(that.element, suggestion);

            }

        },



        getValue: function (value) {

            var that = this,

                delimiter = that.options.delimiter,

                currentValue,

                parts;



            if (!delimiter) {

                return value;

            }



            currentValue = that.currentValue;

            parts = currentValue.split(delimiter);



            if (parts.length === 1) {

                return value;

            }



            return currentValue.substr(0, currentValue.length - parts[parts.length - 1].length) + value;

        }

    };



    // Create chainable jQuery plugin:

    $.fn.autocomplete = function (options, args) {

        return this.each(function () {

            var dataKey = 'autocomplete',

                inputElement = $(this),

                instance;



            if (typeof options === 'string') {

                instance = inputElement.data(dataKey);

                if (typeof instance[options] === 'function') {

                    instance[options](args);

                }

            } else {

                instance = new Autocomplete(this, options);

                inputElement.data(dataKey, instance);

            }

        });

    };

}));