(function($){
    if(!$.Indextank){
        $.Indextank = new Object();
    };

    // this is a hacky way of getting querybuilder dependencies 
    // XXX remove this once there's a minified / bundled version of indextank-jquery
    try {
        new Query();
    } catch(e) {
        // ok, I need to include querybuilder
        var qscr = $("<script/>").attr("src", "https://raw.github.com/flaptor/indextank-jquery/master/querybuilder.js");
        $("head").append(qscr);
    }; 



    $.Indextank.AjaxSearch = function(el, options){
        // To avoid scope issues, use 'base' instead of 'this'
        // to reference this class from internal events and functions.
        var base = this;
        
        // Access to jQuery and DOM versions of element
        base.$el = $(el);
        base.el = el;
        
        // Add a reverse reference to the DOM object
        base.$el.data("Indextank.AjaxSearch", base);
        
        base.init = function(){
            
            base.options = $.extend({},$.Indextank.AjaxSearch.defaultOptions, options);
            base.xhr = undefined;
            
            
            // TODO: make sure ize is an Indextank.Ize element somehow
            base.ize = $(base.el.form).data("Indextank.Ize");
            
            // create the default query, and map default parameters on it
            base.defaultQuery = new Query("")
                                    .withStart(base.options.start)
                                    .withLength(base.options.rsLength)
                                    .withFetchFields(base.options.fields)
                                    .withSnippetFields(base.options.snippets)
                                    .withScoringFunction(base.options.scoringFunction)
                                    .withFetchVariables(base.options.fetchVariables)
                                    .withFetchCategories(base.options.fetchCategories)
                                    .withQueryReWriter(base.options.rewriteQuery);
            
            
            base.ize.$el.bind("submit", base.hijackFormSubmit);


            // make it possible for other to trigger an ajax search
            base.$el.bind( "Indextank.AjaxSearch.runQuery", base.runQuery );
            base.$el.bind( "Indextank.AjaxSearch.displayNoResults", base.displayNoResults );
        };
        
        // Sample Function, Uncomment to use
        // base.functionName = function(paramaters){
        // 
        // };

        base.displayNoResults = function() {
            base.options.listeners.trigger("Indextank.AjaxSearch.noResults", base.el.value);
        }

        // gets a copy of the default query.
        base.getDefaultQuery = function() {
            return base.defaultQuery.clone();
        };
            
            
        base.runQuery = function( event, query ) {
            // don't run a query twice
            if (base.query == query ) {
                return;
            } 
            
            // if we are running a query, an old one makes no sense.
            if (base.xhr != undefined ) {
                base.xhr.abort();
            }
           

            // remember the current running query
            base.query = query;

            base.options.listeners.trigger("Indextank.AjaxSearch.searching");
            base.$el.trigger("Indextank.AjaxSearch.searching");


            // run the query, with ajax
            base.xhr = $.ajax( {
                url: base.ize.apiurl + "/v1/indexes/" + base.ize.indexName + "/search",
                dataType: "jsonp",
                data: query.asParameterMap(),
                timeout: 1000,
                success: function( data ) { 
                            // Indextank API does not send the query back.
                            // I'll save the current query inside 'data',
                            // so our listeners can use it.
                            data.query = query;
                            base.options.listeners.trigger("Indextank.AjaxSearch.success", data);
                            },
                error: function( jqXHR, textStatus, errorThrown) {
                            base.options.listeners.trigger("Indextank.AjaxSearch.failure");
                }
            } );
        } 

        base.hijackFormSubmit = function(event) {
            // make sure the form is not submitted
            event.preventDefault();
            base.runQuery( event, base.getDefaultQuery().withQueryString(base.el.value) );
        };


        // unbind everything
        base.destroy = function() {
            base.$el.unbind("Indextank.AjaxSearch.runQuery", base.runQuery);
            base.ize.$el.unbind("submit", base.hijackFormSubmit);
            base.$el.removeData("Indextank.AjaxSearch");
        };


        // Run initializer
        base.init();
    };
    
    $.Indextank.AjaxSearch.defaultOptions = {
        // first result to fetch .. it can be overrided at query-time,
        // but we need a default. 99.95% of the times you'll want to keep the default
        start : 0,
        // how many results to fetch on every query? 
        // it can be overriden at query-time.
        rsLength : 10, 
        // default fields to fetch .. 
        fields : "name,title,image,url,link",
        // fields to make snippets for
        snippets : "text",
        // no one listening .. sad
        listeners: $([]),
        // scoring function to use
        scoringFunction: 0,
        // fetch all variables,
        fetchVariables: 'true',
        // fetch all categories,
        fetchCategories: 'true',
        // the default query re-writer is identity
        rewriteQuery: function(q) {return q}
    };
    
    $.fn.indextank_AjaxSearch = function(options){
        return this.each(function(){
            (new $.Indextank.AjaxSearch(this, options));
        });
    };
    
})(jQuery);