const SipeHttp = {};

SipeHttp.newReq = (url, method, data) => {
    return new Promise(function (resolve, reject) {

        const xhr = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject("Microsoft.XMLHTTP");

        xhr.onreadystatechange = function () {
            if (xhr.readyState === 4) {
                if (xhr.status === 200) {
                    let s = xhr.responseText;

                    if (!s) {
                        resolve(null);
                        return;
                    }

                    s = s.trim();

                    if (!s) {
                        resolve(null);
                        return;
                    }

                    let res;

                    if (s.startsWith('{') && s.endsWith('}')) {
                        res = JSON.parse(s);
                        const erro = res.error || res.erro; 
                        if (erro) {
                            reject('Ocorreu um erro ao tentar realizar a operação: ' + erro);
                            return;
                        }
                    } else if (s.startsWith('[') && s.endsWith(']')) {
                        res = JSON.parse(s);
                    } else {
                        res = s;
                    }
                    resolve(res);

                } else {
                    reject('Erro na requisição: ' + xhr.status);
                }
            }
        };

        xhr.open(method, url, true);
        xhr.setRequestHeader('Content-Type', 'application/json');

        if (data) {
            xhr.send(JSON.stringify(data));
        } else {
            xhr.send();
        }

    });
};

SipeHttp.get = (url) => SipeHttp.newReq(url, 'GET');
SipeHttp.post = (url, data) => SipeHttp.newReq(url, 'POST', data);

SipeHttp.toString = (array, path, obj) => {

    if (!obj) {
        return "";
    } else if (typeof(obj) === 'object') {
        if (path) {
            path += ".";
        } else {
            path = "";
        }
        for (const a in obj) {
            SipeHttp.toString(array, path+a, obj[a]);
        }
    } else {
        array.push(path + "=" + obj);
    }

    if (array.length) {
        return "?" + array.join("&");
    } else {
        return "";
    }

};

SipeHttp.action = (action, metodo, params) => {
    const url = "/sipe/" + action + "!" + metodo + ".action" + SipeHttp.toString([], "", params);
    return SipeHttp.get(url);
    //return SipeHttp.post(url, params);
};

SipeHttp.exec = (action, params) => SipeHttp.action(action, "exec", params);