import merge from 'deepmerge';
import { extname, join } from 'path';

import { BaseAppConfig } from '../lib/@types';
import { NAMES } from '../lib/common/constants';

export class LocaleLanguage {
	lang: string;

	constructor(private readonly defaultLang = 'en') {
		const appConfig = io.services.fsUtils.tryReadJsonSync<BaseAppConfig>(
			join(io.constants.APP_PATH, NAMES.files.appConfig),
		);
		this.lang = appConfig?.language || defaultLang;
	}

	async getLocale<T extends Record<string, unknown>>(rootPath: string, fileBaseName: string = 'index') {
		const getPath = async (lang: string) => {
			const rootLangPath = join(rootPath, lang);
			const ext = process.argv[0].match('ts-node') ? '.ts' : '.js';
			return join(rootLangPath, fileBaseName + ('.' + ext).replace(/\.\./, '.'));
		};

		try {
			const defaultFilePath = await getPath(this.defaultLang);
			const currentLangFilePath = await getPath(this.lang);
			const enFileLocale = (await import(defaultFilePath)) as T | null;
			let currentLangFileLocale = {} as T | null;
			try {
				currentLangFileLocale = (await import(currentLangFilePath)) as T | null;
			} catch (error) {
				io.logger.write(io.libs.chalk.gray(`* Missing ${this.lang} locale data`));
				currentLangFileLocale = null;
			}

			if (!enFileLocale && !currentLangFileLocale) {
				return null;
			}

			const mergedLocale = merge(enFileLocale || {}, currentLangFileLocale || {}, {
				// TODO: CHECK
				arrayMerge: (target, src) => src,
			});

			return mergedLocale as T;
		} catch (error) {
			return null;
		}
	}
}