/*
 *
 *  Ajax Autocomplete for jQuery, version 1.0.3
 *  (c) 2009 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: 10:49 AM 3/13/2009
 *
 */

(function($) {

    $.fn.autocomplete = function(options) {
        return this.each(function() {
            return new Autocomplete(this, options);
        });
    };

    var Autocomplete = function(el, options) {
        this.el = $(el);
        this.id = this.el.attr('id');
        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.options = {
            autoSubmit: false,
            minChars: 1,
            maxHeight: 300,
            deferRequestBy: 0,
            width: 0,
            isAspDotNetWS: false,
            customParameterName: null
        };
        if (options) { $.extend(this.options, options); }
        this.initialize();
    };

    Autocomplete.isArray = function(obj) { return obj && obj.constructor === Array; };

    Autocomplete.highlight = function(value, re) {
        return value.replace(re, function(match) { return '<strong>' + match + '<\/strong>'; });
    };

    Autocomplete.prototype = {

        killerFn: null,

        initialize: function() {

            var me = this;

            this.killerFn = function(e) {
                if ($(e.target).parents('.autocomplete').size() === 0) {
                    me.killSuggestions();
                    me.disableKillerFn();
                }
            };

            var uid = new Date().getTime()
            var autocompleteElId = 'Autocomplete_' + uid;

            if (!this.options.width) { this.options.width = this.el.width(); }
            this.mainContainerId = 'AutocompleteContainter_' + uid;

            $('<div id="' + this.mainContainerId + '" style="position:absolute;"><div class="autocomplete-w1"><div class="autocomplete-w2"><div class="autocomplete" id="' + autocompleteElId + '" style="display:none; width:' + this.options.width + 'px;"></div></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(); });

            this.container.css({ maxHeight: this.options.maxHeight + 'px' });
        },

        fixPosition: function() {
            var offset = this.el.offset();
            $('#' + this.mainContainerId).css({ top: (offset.top + this.el.height()) + '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.enabled) { return; }
            // return will exit the function
            // and event will not fire
            switch (e.keyCode) {
                case 27: //Event.KEY_ESC:
                    this.el.val(this.currentValue);
                    this.hide();
                    break;
                case 9: //Event.KEY_TAB:
                case 13: //Event.KEY_RETURN:
                    if (this.selectedIndex === -1) {
                        this.hide();
                        return;
                    }
                    this.select(this.selectedIndex);
                    if (e.keyCode === 9/* Event.KEY_TAB */) { return; }
                    break;
                case 38: //Event.KEY_UP:
                    this.moveUp();
                    break;
                case 40: //Event.KEY_DOWN:
                    this.moveDown();
                    break;
                default:
                    return;
            }
			e.stopImmediatePropagation();
            e.preventDefault();
        },

        onKeyUp: function(e) {
            switch (e.keyCode) {
                case 38: //Event.KEY_UP:
                case 40: //Event.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:
                    this.onChangeInterval = setInterval((function() {
                        this.onValueChange();
                    }).bind(this), this.options.deferRequestBy);
                } else {
                    this.onValueChange();
                }
            }
        },

        onValueChange: function() {
            clearInterval(this.onChangeInterval);
            this.currentValue = this.el.val();
            this.selectedIndex = -1;
            if (this.ignoreValueChange) {
                this.ignoreValueChange = false;
                return;
            }
            if (this.currentValue === '' || this.currentValue.length < this.options.minChars) {
                this.hide();
            } else {
                this.getSuggestions();
            }
        },

        getSuggestions: function() {
            var cr = this.cachedResponse[this.currentValue];
            if (cr && Autocomplete.isArray(cr.suggestions)) {
                this.suggestions = cr.suggestions;
                this.data = cr.data;
                this.suggest();
            } else if (!this.isBadQuery(this.currentValue)) {
                var me = this;
                if (this.options.isAspDotNetWS) {
                    $.ajax({
                        type: "POST",
                        url: this.serviceUrl,
                        contentType: "application/json",
                        data: "{'query': '" + this.currentValue.toString() + "'}",
                        success: function(json) { me.processResponse(json); },
                        dataType: 'json'
                    });
                }
                else
                    $.get(this.serviceUrl, { query: this.currentValue }, function(json) { me.processResponse(json); }, 'json');
            }
        },

        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 re = new RegExp('\\b' + this.currentValue.match(/\w+/g).join('|\\b'), 'gi');
            var me = this;
            var len = this.suggestions.length;
            var div;
            this.container.html('');
            for (var i = 0; i < len; i++) {
                div = $((me.selectedIndex === i ? ('<div class="selected '+ (me.data[i]=="" ? 'cat' : '') +'"') : ('<div' + (me.data[i]=="" ? ' class="cat"' : ''))) + ' title="' + me.suggestions[i] + '">' + Autocomplete.highlight(me.suggestions[i], re) + '</div>');
                div.mouseover((function(xi) { return function() { me.activate(xi); }; })(i));
                if(me.data[i] != "")
					div.click((function(xi) { return function() { me.select(xi); }; })(i));
                //console.log(div);
                this.container.append(div);
            }
            this.enabled = true;
            this.container.show();
        },

        processResponse: function(json) {
            var response;
            try {
                response = json;
                if (!Autocomplete.isArray(response.data)) { response.data = []; }
            } catch (err) { return; }
            this.suggestions = response.suggestions;
            this.data = response.data;
            this.cachedResponse[response.query] = response;
            if (response.suggestions.length === 0) { this.badQueries.push(response.query); }
            if (response.query === this.currentValue) { this.suggest(); }
        },

        activate: function(index) {
            var divs = this.container.children();
            var activeItem;
            // Clear previous selection:
            if (this.selectedIndex !== -1 && divs.length > this.selectedIndex && !$(divs.get(this.selectedIndex)).hasClass('cat')) {
                $(divs.get(this.selectedIndex)).attr('class', '');
            }
            this.selectedIndex = index;
            if (this.selectedIndex !== -1 && divs.length > this.selectedIndex && !$(divs.get(this.selectedIndex)).hasClass('cat')) {
                activeItem = divs.get(this.selectedIndex);
                $(activeItem).attr('class', 'selected');
            }
            return activeItem;
        },

        deactivate: function(div, index) {
            div.className = '';
            if (this.selectedIndex === index) { this.selectedIndex = -1; }
        },

        select: function(i) {
            var selectedValue = this.suggestions[i];
            if (selectedValue) {
                this.el.val(selectedValue);
				this.el.change();
                if (this.options.autoSubmit) {
                    var 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 = this.activate(i);
            var offsetTop = activeItem.offsetTop;
            var upperBound = this.container.scrollTop();
            var 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.suggestions[i]);
        },

        onSelect: function(i) {
            (this.options.onSelect || function() { })(this.suggestions[i], this.data[i]);
        }

    };

})(jQuery);