const fs = require('fs');
const path = require('path');

class msgManager {
    constructor() {
        this.errs = {};
        this.defLang = 'zh';
        let err = require(`./language/zh`);
        this.errs['zh'] = err;
    }

    checkLang(lang = '') {
        let lng = this.defLang;
        if (typeof lang == 'string' && lang.trim().length > 0) {
            let l = lang.split(',');
            if (l.length > 0) {
                let tmp = l[0].substring(0, 2);
                if (tmp.trim().length > 0) lng = tmp;
            }
        }

        if (!(lng in this.errs)) {
            try {
                let errs = require(`./language/${lng}`);
                this.errs[lng] = errs;
            } catch (err) {
                lng = this.defLang;
            }
        }
        return lng;
    }

    getMsg(code, lang = '') {
        let lng = this.checkLang(lang);

        return this.errs[lng][code] || 'errorCode not found';
    }

    getMailTemplate(type, lang = '') {
        let lng = this.checkLang(lang);

        return this.errs[lng]['mail'][type] || {};
    }
}

module.exports = new msgManager();