export interface SitemapUrl {
    url: string;
    lastModified: Date;
    changeFrequency: 'always' | 'hourly' | 'daily' | 'weekly' | 'monthly' | 'yearly' | 'never';
    priority: number;
}

export const supportedLocales = ['zh-CN', 'zh-TW', 'en', 'ko', 'ja'];

export const pages = [
    {
        path: '',
        priority: 1.0,
        changeFrequency: 'weekly' as const,
    },
    {
        path: '/products',
        priority: 0.9,
        changeFrequency: 'weekly' as const,
    },
    {
        path: '/pricing',
        priority: 0.9,
        changeFrequency: 'monthly' as const,
    },
    {
        path: '/support',
        priority: 0.8,
        changeFrequency: 'monthly' as const,
    },
    {
        path: '/contact',
        priority: 0.7,
        changeFrequency: 'monthly' as const,
    },
    {
        path: '/sitemap',
        priority: 0.5,
        changeFrequency: 'monthly' as const,
    },
];

export function generateSitemapUrls(baseUrl: string): SitemapUrl[] {
    const urls: SitemapUrl[] = [];
    const now = new Date();

    supportedLocales.forEach((locale) => {
        pages.forEach((page) => {
            urls.push({
                url: `${baseUrl}/${locale}${page.path}`,
                lastModified: now,
                changeFrequency: page.changeFrequency,
                priority: page.priority,
            });
        });
    });

    return urls;
}

export function generateSitemapXML(urls: SitemapUrl[]): string {
    const urlEntries = urls
        .map(
            (url) => `
  <url>
    <loc>${url.url}</loc>
    <lastmod>${url.lastModified.toISOString()}</lastmod>
    <changefreq>${url.changeFrequency}</changefreq>
    <priority>${url.priority}</priority>
  </url>`,
        )
        .join('');

    return `<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
${urlEntries}
</urlset>`;
}