/*
 *
 * (c) Copyright Ascensio System SIA 2010-2019
 *
 * This program is a free software product. You can redistribute it and/or
 * modify it under the terms of the GNU Affero General Public License (AGPL)
 * version 3 as published by the Free Software Foundation. In accordance with
 * Section 7(a) of the GNU AGPL its Section 15 shall be amended to the effect
 * that Ascensio System SIA expressly excludes the warranty of non-infringement
 * of any third-party rights.
 *
 * This program is distributed WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR  PURPOSE. For
 * details, see the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
 *
 * You can contact Ascensio System SIA at 20A-12 Ernesta Birznieka-Upisha
 * street, Riga, Latvia, EU, LV-1050.
 *
 * The  interactive user interfaces in modified source and object code versions
 * of the Program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU AGPL version 3.
 *
 * Pursuant to Section 7(b) of the License you must retain the original Product
 * logo when distributing the program. Pursuant to Section 7(e) we decline to
 * grant you any rights under trademark law for use of our trademarks.
 *
 * All the Product's GUI elements, including illustrations and icon sets, as
 * well as technical writing content are licensed under the terms of the
 * Creative Commons Attribution-ShareAlike 4.0 International. See the License
 * terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
 *
*/
if (Common === undefined) {
    var Common = {};
}

Common.Locale = new(function() {
    "use strict";
    var l10n = {};

    // var _createXMLHTTPObject = function() {
    //     var xmlhttp;
    //     try {
    //         xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
    //     }
    //     catch (e) {
    //         try {
    //             xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    //         }
    //         catch (E) {
    //             xmlhttp = false;
    //         }
    //     }
    //     if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {
    //         xmlhttp = new XMLHttpRequest();
    //     }
    //     return xmlhttp;
    // };

    var _applyLocalization = function() {
        try {
            for (var prop in l10n) {
                var p = prop.split('.');
                if (p && p.length > 2) {

                    var obj = window;
                    for (var i = 0; i < p.length - 1; ++i) {
                        if (obj[p[i]] === undefined) {
                            obj[p[i]] = new Object();
                        }
                        obj = obj[p[i]];
                    }

                    if (obj) {
                        obj[p[p.length - 1]] = l10n[prop];
                    }
                }
            }
        }
        catch (e) {
        }
    };

    var _get = function(prop, scope) {
        var res = '';
        if (scope && scope.name) {
            res = l10n[scope.name + '.' + prop];
        }

        return res || (scope ? eval(scope.name).prototype[prop] : '');
    };

    var _getUrlParameterByName = function(name) {
        name = name.replace(/[\[]/, "\\\[").replace(/[\]]/, "\\\]");
        var regex = new RegExp("[\\?&]" + name + "=([^&#]*)"),
            results = regex.exec(location.search);
        return results == null ? "" : decodeURIComponent(results[1].replace(/\+/g, " "));
    };

    // {
    //     let lang = (_getUrlParameterByName('lang') || 'en').split(/[\-_]/)[0];
    //     let httpGet = function(url) {
    //         return new Promise(
    //             function (resolve, reject) {
    //                 var request = new XMLHttpRequest();
    //                 request.onload = function() {
    //                     if ( this.readyState === 4 )
    //                         if ( this.status == 200 ) {
    //                             resolve(this.responseText);
    //                         } else {
    //                             resolve('failed');
    //                         }
    //                     else reject('error: ' + this.readyState);
    //                 };
    //                 request.onerror = function () {
    //                     reject(new Error(
    //                         'XMLHttpRequest Error: '+this.statusText));
    //                 };
    //                 request.open('GET', url);
    //                 request.send(null);
    //             });
    //     }
    //
    //     httpGet('locale/' + lang + '.json')
    //         .then(function(result) {
    //             // console.log('httpget result: ' + result);
    //
    //             if ( result == 'failed' ) {
    //                 if ( lang != 'en' )
    //                     return httpGet('locale/en.json');
    //
    //                 return result;
    //             }
    //
    //             return result;
    //         }).then(function(result) {
    //             if (result == 'failed')
    //                 throw new Error('server error');
    //             else {
    //                 let _l10n = JSON.parse(result);
    //                 // console.log('ok: ' + _l10n);
    //                 console.log('ok: ');
    //             }
    //         }).catch(function(e) {
    //             console.log('httpget error: ' + e);
    //         });
    // }

    var _requireLang = function () {
        var lang = (_getUrlParameterByName('lang') || 'en').split(/[\-_]/)[0];
        fetch('locale/' + lang + '.json')
            .then(function(response) {
                if (!response.ok) {
                    if (lang != 'en')
                        /* load default lang if fetch failed */
                        return fetch('locale/en.json');

                    throw new Error('server error');
                }
                return response.json();
            }).then(function(response) {
                if ( response.then )
                    return response.json();
                else {
                    l10n = response;
                    /* to break promises chain */
                    throw new Error('loaded');
                }
            }).then(function(json) {
                if ( !!json ) l10n = json;
            }).catch(function(e) {
                if ( e.message == 'loaded' ) {

                } else
                    console.log('fetch error: ' + e);
            });
    };

    if ( !window.fetch ) {
        /* use fetch polifill if native method isn't supported */
        require(['../vendor/fetch/fetch.umd'], _requireLang);
    } else _requireLang();

    try {
        // var langParam = _getUrlParameterByName('lang');
        // var xhrObj = _createXMLHTTPObject();
        // if (xhrObj && langParam) {
        //     var lang = langParam.split(/[\-\_]/)[0];
            // xhrObj.open('GET', 'locale/' + lang + '.json', false);
            // xhrObj.send('');
            // l10n = eval("(" + xhrObj.responseText + ")");
        // }
    }
    catch (e) {
        try {
            // xhrObj.open('GET', 'locale/en.json', false);
            // xhrObj.send('');
            // l10n = eval("(" + xhrObj.responseText + ")");
        }
        catch (e) {
        }
    }

    return {
        apply: _applyLocalization,
        get: _get
    };
    
})();