import * as en_GB from '@cf/lang/en_GB.json';

/**
 * @param {string} lang IETH language tag (i.e. en_GB)
 * @returns Map<string, string | string[]>
 */
export default function init(lang) {
    let i18n = new Object();
    let language;

    // TODO: dynamic imports seem to fail here; it can't find the file.
    // try {
    //     language = import(`../lang/${lang}.json`);
    // } catch (error) {
    //     throw error;
    // }

    language = en_GB;

    i18n.lang = language;
    i18n.lang_code = lang;
    i18n.string = function(/* @type string */ key) {
        const tokens = key.split('.');
        
        let i = 0;
        let token = tokens[i];
        let res = this.lang;
        while (true) {
            res = res[token];
            if (res === undefined) {
                console.warn(`${key} not found for language ${this.lang_code}`);
                return key;
            }
            if (typeof res === 'string' || res instanceof String)
                return res;
            i++;
            token = tokens[i];
        }
    }
    i18n.stringArray = function(/* @type string */ key) {
        const tokens = key.split('.');
        
        let i = 0;
        let token = tokens[i];
        let res = this.lang;
        while (true) {
            res = res[token];
            if (res === undefined) {
                console.warn(`${key} not found for language ${this.lang_code}`);
                return key;
            }
            if (Array.isArray(res))
                return res;
            i++;
            token = tokens[i];
        }
    }

    return i18n;
}