/*-- ------------------------------------------------------
oxsolution JAVASCRIPT functions  http://www.oxsolution.com
------------------------------------------------------ --*/

function oxc_RPC(returnType) {
    this.returnType = returnType || "text"; //header, text, json, xml, body, status, statusText
    this.utf8Sign = true; //force get method using encodeURI with "&rpcCharset=utf8"
    this.timeout = 5000;
    this.busy = false;

    this.httpConnect = function() {
        var http;
        try {
            http = new XMLHttpRequest();
        }catch(e) {
            try {
                http = new ActiveXObject("Microsoft.XMLHTTP");
            }catch(e) {
                try {
                    http  = new ActiveXObject("Msxml2.XMLHTTP");
                }catch(e) {
                    http = false;
                }
            }
        }
        return http;
    }

    this.http = this.httpConnect();

    this.returnValue = function(type) {
        if (type == "header") return this.http.getAllResponseHeaders(); //header as string
        if (type == "text") return this.http.responseText; //string
        if (type == "json") return this.code2obj(this.http.responseText); //JSON object
        if (type == "xml") return this.http.responseXML; //XML DOM object
        if (type == "body") return this.http.responseBody; //unsined bytes array
        if (type == "status") return this.http.status; //200 is ok
        if (type == "statusText") return this.http.statusText; //'OK' is ok
        return "";
    }

    this.abort = function() {
        if (this.http) {
            this.http.abort();
        }
        this.http = this.httpConnect();
        this.httpFinish();
    }

    this.httpGet = function(url,func) {
        if (this.busy) return;

        if (this.utf8Sign) {
            url += ((url.indexOf("?") == -1)? "?" : "&")+"rpcCharset=utf8";
            url = encodeURI(url);
        }

        var aSync = true;

        if (func == false || func == null) {
            aSync = false;

        }else if (typeof func == "function") {
            this.httpStart();

            var that = this;
            var timer = setTimeout(function() {that.abort()}, this.timeout);

            this.http.onreadystatechange = function() {
                if (that.http.readyState == 4 && that.http.status == 200) {
                    if (timer) {
                        clearTimeout(timer);
                        timer = null;
                    }
                    that.httpFinish();
                    func(that.returnValue(that.returnType));
                }
            };
        }

        this.http.open("GET",url,aSync);
        this.http.setRequestHeader("Content-Type", "text/xml");
        this.http.send(null);

        if (!aSync) return this.returnValue(this.returnType);
    }

    this.httpPost = function(url,obj,func) {
        if (this.busy) return;

        if (this.utf8Sign) {
            url += ((url.indexOf("?") == -1)? "?" : "&")+"rpcCharset=utf8";
            url = encodeURI(url);
        }

        var aSync = true;

        if (func == false || func == null) {
            aSync = false;

        }else if (typeof func == "function") {
            this.httpStart();

            var that = this;
            var timer = setTimeout(function() {that.abort()}, this.timeout);

            this.http.onreadystatechange = function() {
                if (that.http.readyState == 4 && that.http.status == 200) {
                    if (timer) {
                        clearTimeout(timer);
                        timer = null;
                    }
                    that.httpFinish();
                    func(that.returnValue(that.returnType));
                }
            };
        }

        this.http.open("POST",url,aSync);
        this.http.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");

        var buf = "";
        if (typeof obj == "object") {
            for (var key in obj) {
                buf += "&"+encodeURIComponent(key)+"="+encodeURIComponent(obj[key]);
            }
            if (buf != "") buf = buf.substr(1);
        }else{
            buf = encodeURI(obj);
        }
        this.http.send(buf);

        if (!aSync) return this.returnValue(this.returnType);
    }

    this.httpStart = function() {
        this.busy = true;
        showLoading();
    }

    this.httpFinish = function() {
        this.busy = false;
        hideLoading();
    }

    this.code2obj = function(code) {
        var obj;
        try {
            eval("obj = "+code+";");
            return obj;
        }catch(e) {
            return false;
        }
    }

    this.obj2code = function(obj) {
        var buf = "", type;

        for (var key in obj) {
            type = (obj[key] == null)? "null" : typeof obj[key];
            if (type == "function") continue;

            buf += ',"'+key+'":';
            if (type == "string") buf += '"'+this.escapeChar(obj[key])+'"';
            else if (type == "number" || type == "boolean") buf += obj[key].toString();
            else if (type == "null") buf += "null";
            else buf += this.obj2code(obj[key]);
        }

        if (buf != "") buf = buf.substr(1);
        return "{"+buf+"}";
    }

    this.escapeChar = function(v) {
        return v.replace(/\\/g,"\\\\")
                .replace(/\"/g,'\\"')
                .replace(/\n/g,"\\n")
                .replace(/\r/g,"\\r")
                .replace(/\t/g,"\\t");
    }
}