// Shared localization for the service panel and progress window.
(function () {
'use strict';

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

const LANGUAGES = ['en', 'zh_CN', 'zh_TW', 'ja_JP', 'ko_KR', 'ru_RU', 'es_ES', 'de_DE'];
const FALLBACK = 'zh_CN';

function normalizeLocale(raw) {
	if (!raw) return null;
	const tag = String(raw).trim().toLowerCase().replace(/-/g, '_');
	if (tag === 'zh_tw' || tag === 'zh_hk' || tag === 'zh_hant' || tag === 'zh_mo') return 'zh_TW';
	for (const code of LANGUAGES) {
		if (code.toLowerCase() === tag) return code;
	}
	const base = tag.split('_')[0];
	if (base === 'zh') return 'zh_CN';
	for (const code of LANGUAGES) {
		if (code.toLowerCase().split('_')[0] === base) return code;
	}
	return null;
}

function requestedLocale() {
	try {
		const fromUrl = new URLSearchParams(location.search).get('lang');
		if (fromUrl) return fromUrl;
	} catch (error) { /* No browser location. */ }
	try {
		if (typeof eagle !== 'undefined' && eagle.app && eagle.app.locale) return eagle.app.locale;
	} catch (error) { /* Eagle API is injected asynchronously. */ }
	try {
		return navigator.language;
	} catch (error) {
		return null;
	}
}

function pluginRoot() {
	if (window.SpinePluginPath) return window.SpinePluginPath;
	if (window.SpinePluginRoot) return window.SpinePluginRoot;
	return typeof __dirname !== 'undefined' ? __dirname : null;
}

function readLocale(code) {
	try {
		const root = pluginRoot();
		if (!root) return {};
		return JSON.parse(fs.readFileSync(path.join(root, '_locales', code + '.json'), 'utf8'));
	} catch (error) {
		return {};
	}
}

function lookup(table, key) {
	let node = table;
	for (const part of String(key).split('.')) {
		if (!node || typeof node !== 'object') return undefined;
		node = node[part];
	}
	return typeof node === 'string' ? node : undefined;
}

function apply(root) {
	const scope = root || document;
	for (const el of scope.querySelectorAll('[data-i18n]')) el.textContent = t(el.dataset.i18n);
	for (const el of scope.querySelectorAll('[data-i18n-title]')) el.title = t(el.dataset.i18nTitle);
	for (const el of scope.querySelectorAll('[data-i18n-aria-label]')) el.setAttribute('aria-label', t(el.dataset.i18nAriaLabel));
}

let fallbackMessages = readLocale(FALLBACK);
let locale = FALLBACK;
let messages = fallbackMessages;

function t(key, vars) {
	let text = lookup(messages, key);
	if (text === undefined) text = lookup(fallbackMessages, key);
	if (text === undefined) return key;
	if (vars) {
		text = text.replace(/\{(\w+)\}/g, (whole, name) =>
			Object.prototype.hasOwnProperty.call(vars, name) ? String(vars[name]) : whole);
	}
	return text;
}

function setLocale(raw) {
	locale = normalizeLocale(raw) || FALLBACK;
	fallbackMessages = readLocale(FALLBACK);
	messages = locale === FALLBACK ? fallbackMessages : readLocale(locale);
	document.documentElement.lang = locale.replace('_', '-');
	apply(document);
	return locale;
}

const api = {
	languages: LANGUAGES,
	fallback: FALLBACK,
	get locale() { return locale; },
	normalizeLocale,
	requestedLocale,
	setLocale,
	t,
	apply,
};

window.SpineThumbI18n = api;
setLocale(requestedLocale());

})();