export type Locale = 'zh-CN' | 'zh-TW' | 'en';

export const locales: Locale[] = ['zh-CN', 'zh-TW', 'en'];

export const defaultLocale: Locale = 'zh-CN';

export const languages = [
    { code: 'zh-CN' as Locale, name: '简体中文', flag: '🇨🇳' },
    { code: 'zh-TW' as Locale, name: '繁體中文', flag: '🇹🇼' },
    { code: 'en' as Locale, name: 'English', flag: '🇺🇸' },
];

export async function getTranslations(locale: Locale, namespace: string) {
    // Validate inputs
    if (!locales.includes(locale) || !namespace || namespace.includes('.')) {
        console.warn(`Invalid locale or namespace: ${locale}/${namespace}`);
        return {};
    }

    try {
        const translations = await import(`../data/locales/${locale}/${namespace}.json`);
        return translations.default;
    } catch (error) {
        console.warn(`Failed to load translations for ${locale}/${namespace}:`, error);
        // Fallback to default locale
        if (locale !== defaultLocale) {
            try {
                const fallbackTranslations = await import(
                    `../data/locales/${defaultLocale}/${namespace}.json`
                );
                return fallbackTranslations.default;
            } catch (fallbackError) {
                console.error(
                    `Failed to load fallback translations for ${defaultLocale}/${namespace}:`,
                    fallbackError,
                );
                return {};
            }
        }
        return {};
    }
}

export function getLocaleFromPath(pathname: string): Locale {
    const segments = pathname.split('/').filter(Boolean);
    const firstSegment = segments[0];

    if (locales.includes(firstSegment as Locale)) {
        return firstSegment as Locale;
    }

    return defaultLocale;
}

export function removeLocaleFromPath(pathname: string): string {
    const segments = pathname.split('/').filter(Boolean);
    const firstSegment = segments[0];

    if (locales.includes(firstSegment as Locale)) {
        return '/' + segments.slice(1).join('/');
    }

    return pathname;
}

export function addLocaleToPath(pathname: string, locale: Locale): string {
    if (locale === defaultLocale) {
        return pathname;
    }

    const cleanPath = removeLocaleFromPath(pathname);
    return `/${locale}${cleanPath === '/' ? '' : cleanPath}`;
}

export function generateLocalizedPath(path: string, locale: Locale): string {
    // Remove leading slash if present
    const cleanPath = path.startsWith('/') ? path.slice(1) : path;

    if (locale === defaultLocale) {
        return `/${cleanPath}`;
    }

    return `/${locale}/${cleanPath}`;
}

export function getNavigationPaths(locale: Locale) {
    const basePaths = [
        { key: 'home', path: '' },
        { key: 'products', path: 'products' },
        { key: 'news', path: 'news' },
        { key: 'support', path: 'support' },
        { key: 'about', path: 'about' },
    ];

    return basePaths.map((item) => ({
        key: item.key,
        path: generateLocalizedPath(item.path, locale),
    }));
}