import slugify from 'slugify';
/**
 * Normalizes a filename: slugifies the NAME part (diacritics, spaces, case)
 * while preserving the extension. Keeps uploaded media URLs clean and portable.
 *
 *   "Zdjęcie jeden nad morzem.jpg"  → "zdjecie-jeden-nad-morzem.jpg"
 *   "Faktura #12 (2024).PDF"        → "faktura-12-2024.pdf"
 *   "already-clean.webp"            → "already-clean.webp"
 *
 * Why not toSlug(): toSlug uses strict:true, which would strip the dot and
 * merge name+extension. Here we split on the LAST dot, slug the stem, lowercase
 * the extension, and rejoin.
 */ export function normalizeFilename(filename) {
    const lastDot = filename.lastIndexOf('.');
    // No extension (or leading-dot dotfile) → slug the whole thing.
    if (lastDot <= 0) {
        return slugify(filename, {
            lower: true,
            strict: true,
            trim: true
        });
    }
    const stem = filename.slice(0, lastDot);
    const ext = filename.slice(lastDot + 1).toLowerCase();
    const cleanStem = slugify(stem, {
        lower: true,
        strict: true,
        trim: true
    });
    const cleanExt = slugify(ext, {
        lower: true,
        strict: true,
        trim: true
    });
    // Stem could slug to empty (e.g. filename was all symbols) — fall back so we
    // never produce a nameless file.
    const safeStem = cleanStem || 'plik';
    return cleanExt ? `${safeStem}.${cleanExt}` : safeStem;
}
/**
 * beforeOperation hook for an upload collection (e.g. Media). Rewrites the
 * incoming file's name to its normalized form before Payload stores it, so both
 * the stored file and its DB filename are clean. Works with local disk and with
 * cloud storage adapters (R2/S3) — it runs before the storage layer.
 *
 * Wire into your Media collection:
 *   import { normalizeFilenameHook } from '@intecion/ipal-kit'
 *   hooks: { beforeOperation: [normalizeFilenameHook] }
 */ export const normalizeFilenameHook = ({ req, operation })=>{
    if (operation !== 'create' && operation !== 'update') return;
    const file = req.file;
    if (file?.name) {
        file.name = normalizeFilename(file.name);
    }
};

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