'use strict'
/**
 * Copyright (c) 2017~2020, OBCon Inc.
 * All rights reserved.
 */

/**
 * @file
 * @copyright 2017~2020, OBCon Inc.
 * @author gye hyun james kim [pnuskgh@gmail.com]
 */

//--- modules.devices.lang.getModuleName()
//--- modules.devices.lang.getFieldName(req.session.lang, '')
//--- modules.devices.lang.getMsg(req.session.lang, '')
class Lang {
    constructor() {
        this._model = null;
        this.langs = {};
        // this.langs = this.setLang();
    }

    setLang() {
        return {
            ko_KR: {                                        //--- 언어
                name: 'moduleName',                         //--- 모듈 이름
                fields: {
                },
                msgs: {                                     //--- Messages
                },
                sites: {                                    //--- Site별 언어 설정 (Reserved)
                    name: 'moduleName',                     //--- 모듈 이름
                    fields: {
                    },
                    msgs: {                                 //--- Messages
                    }
                }
            }
        };
    }

    _exist(paramObject, paramField) {
        return typeof(paramObject[paramField]) != 'undefined';
        // return Object.getOwnPropertyNames(paramObject).includes(paramField);
        // return -1 < Object.getOwnPropertyNames(paramObject).indexOf(paramField);
    }

    getModuleName(lang = config.service.lang) {
        if ((this._exist(this.langs, lang)) && (this._exist(this.langs[lang], 'name'))) {
            return this.langs[lang].name;
        }

        if (lang != config.service.lang) {
            lang = config.service.lang;
            if ((this._exist(this.langs, lang)) && (this._exist(this.langs[lang], 'name'))) {
                return this.langs[lang].name;
            }
        }
        return this._model._title;
    }

    getFieldName(lang, field) {
        if (arguments.length == 0) {
            lang = config.service.lang;
        }

        if ((this._exist(this.langs, lang)) && (this._exist(this.langs[lang].fields, field))) {
            return this.langs[lang].fields[field];
        }

        if (lang != config.service.lang) {
            lang = config.service.lang;
            if ((this._exist(this.langs, lang)) && (this._exist(this.langs[lang].fields, field))) {
                return this.langs[lang].fields[field];
            }
        }
        return this._model.fields[field].title;
    }

    getMsg(lang, msg) {
        if (arguments.length == 0) {
            lang = config.service.lang;
        }

        if ((this._exist(this.langs, lang)) && (this._exist(this.langs[lang].msgs, msg))) {
            return this.langs[lang].msgs[msg];
        }

        if (lang != config.service.lang) {
            lang = config.service.lang;
            if ((this._exist(this.langs, lang)) && (this._exist(this.langs[lang].msgs, msg))) {
                return this.langs[lang].msgs[msg];
            }
        }
        return '';
    }
}

module.exports = Lang;