/**
 * Serializes sitemap entries to an XML STRING with an XSL stylesheet reference,
 * so /sitemap.xml renders as a readable table in the browser (not raw XML) while
 * staying a valid sitemap for crawlers.
 *
 * Why this exists alongside the Next MetadataRoute sitemap: Next's app/sitemap.ts
 * (returning SitemapEntry[]) does NOT let you inject <?xml-stylesheet?>. To get
 * the styled table, serve a custom route that returns this string instead:
 *
 *   // app/sitemap.xml/route.ts
 *   import { buildSitemapXml } from '@intecion/ipal-kit'
 *   import { sitemap } from '@/lib/content'   // your entries source
 *   export const dynamic = 'force-dynamic'
 *   export async function GET() {
 *     const entries = await sitemap()
 *     const xml = buildSitemapXml(entries, { stylesheetUrl: '/sitemap.xsl' })
 *     return new Response(xml, {
 *       headers: { 'Content-Type': 'application/xml; charset=utf-8' },
 *     })
 *   }
 *
 * Put sitemap.xsl in the project's /public (copy from the plugin's assets, or
 * serve it from a route). The <?xml-stylesheet?> points browsers at it; crawlers
 * ignore it and read the XML. Include hreflang alternates as <xhtml:link>.
 *
 * NOTE: if you use this custom route, DON'T also keep app/sitemap.ts — pick one
 * (the styled route OR the Next MetadataRoute). Two sitemaps at different paths
 * confuse crawlers.
 */ export function buildSitemapXml(entries, opts = {}) {
    const { stylesheetUrl } = opts;
    const esc = (s)=>s.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;').replace(/'/g, '&apos;');
    const urls = entries.map((e)=>{
        const parts = [
            `    <loc>${esc(e.url)}</loc>`
        ];
        if (e.lastModified) {
            const iso = e.lastModified instanceof Date ? e.lastModified.toISOString() : String(e.lastModified);
            parts.push(`    <lastmod>${esc(iso)}</lastmod>`);
        }
        if (e.changeFrequency) parts.push(`    <changefreq>${e.changeFrequency}</changefreq>`);
        if (typeof e.priority === 'number') parts.push(`    <priority>${e.priority}</priority>`);
        // hreflang alternates
        const alternates = e.alternates?.languages;
        if (alternates) {
            for (const [lang, href] of Object.entries(alternates)){
                if (typeof href === 'string') {
                    parts.push(`    <xhtml:link rel="alternate" hreflang="${esc(lang)}" href="${esc(href)}"/>`);
                }
            }
        }
        return `  <url>\n${parts.join('\n')}\n  </url>`;
    }).join('\n');
    const stylesheet = stylesheetUrl ? `<?xml-stylesheet type="text/xsl" href="${esc(stylesheetUrl)}"?>\n` : '';
    return `<?xml version="1.0" encoding="UTF-8"?>\n` + stylesheet + `<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" ` + `xmlns:xhtml="http://www.w3.org/1999/xhtml">\n` + urls + `\n</urlset>`;
}

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