(function(){
/**
 * using AMD (Asynchronous Module Definition) API with OzJS
 * see http://ozjs.org for details
 *
 * Copyright (C) 2010-2012, Dexter.Yy, MIT License
 * vim: et:ts=4:sw=4:sts=4
 */
var browsers = require('../browsers');

    var httpParam = function(a) {
        var s = [];
        if (a.constructor == Array) {
            for (var i = 0; i < a.length; i++)
                s.push(a[i].name + "=" + encodeURIComponent(a[i].value));
        } else {
            for (var j in a)
                s.push(j + "=" + encodeURIComponent(a[j]));
        }
        return s.join("&").replace(/%20/g, "+");
    };

    /**
     * From jquery by John Resig
     */ 
    var ajax = function(s){
        var options = {
            type: s.type || "GET",
            url: s.url || "",
            data: s.data || null,
            dataType: s.dataType,
            contentType: s.contentType === false? false : (s.contentType || "application/x-www-form-urlencoded"),
            username: s.username || null,
            password: s.password || null,
            timeout: s.timeout || 0,
            processData: s.processData === undefined ? true : s.processData,
            beforeSend: s.beforeSend || function(){},
            complete: s.complete || function(){},
            handleError: s.handleError || function(){},
            success: s.success || function(){},
            accepts: {
                xml: "application/xml, text/xml",
                html: "text/html",
                script: "text/javascript, application/javascript",
                json: "application/json, text/javascript",
                text: "text/plain",
                _default: "*/*"
            }
        };
        
        if ( options.data && options.processData && typeof options.data != "string" )
            options.data = httpParam(options.data);
        if ( options.data && options.type.toLowerCase() == "get" ) {
            options.url += (options.url.match(/\?/) ? "&" : "?") + options.data;
            options.data = null;
        }
        
        var status, data, requestDone = false, xhr = window.ActiveXObject ? new ActiveXObject("Microsoft.XMLHTTP") : new XMLHttpRequest();
        xhr.open( options.type, options.url, true, options.username, options.password );
        try {
            if ( options.data && options.contentType !== false )
                xhr.setRequestHeader("Content-Type", options.contentType);
            xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");
            xhr.setRequestHeader("Accept", s.dataType && options.accepts[ s.dataType ] ?
                options.accepts[ s.dataType ] + ", */*" :
                options.accepts._default );
        } catch(e){}
        
        if ( options.beforeSend )
            options.beforeSend(xhr);
            
        var onreadystatechange = function(isTimeout){
            if ( !requestDone && xhr && (xhr.readyState == 4 || isTimeout == "timeout") ) {
                requestDone = true;
                if (ival) {
                    clearInterval(ival);
                    ival = null;
                }

                status = isTimeout == "timeout" && "timeout" || !httpSuccess( xhr ) && "error" || "success";

                if ( status == "success" ) {
                    try {
                        data = httpData( xhr, options.dataType );
                    } catch(e) {
                        status = "parsererror";
                    }
                    
                    options.success( data, status );
                } else
                    options.handleError( xhr, status );
                options.complete( xhr, status );
                xhr = null;
            }
        };

        var ival = setInterval(onreadystatechange, 13); 
        if ( options.timeout > 0 )
            setTimeout(function(){
                if ( xhr ) {
                    xhr.abort();
                    if( !requestDone )
                        onreadystatechange( "timeout" );
                }
            }, options.timeout);    
            
        xhr.send(options.data);

        function httpSuccess(r) {
            try {
                return !r.status && location.protocol == "file:" || ( r.status >= 200 && r.status < 300 ) || r.status == 304 || r.status == 1223 || browsers.safari && !r.status;
            } catch(e){}
            return false;
        }
        function httpData(r,type) {
            var ct = r.getResponseHeader("content-type");
            var xml = type == "xml" || !type && ct && ct.indexOf("xml") >= 0;
            var data = xml ? r.responseXML : r.responseText;
            if ( xml && data.documentElement.tagName == "parsererror" )
                throw "parsererror";
            if ( type == "script" )
                eval.call( window, data );
            if ( type == "json" )
                data = eval("(" + data + ")");
            return data;
        }
        return xhr;
    };

    exports.ajax = ajax;
    exports.params = httpParam;



})();