import { computeSkeleHash } from '../services/companyImport/imageHasher.js';

const skeleCache = new Map();

/**
 * Strips raw binary `thumbavif` buffer and attaches `skeledash` (base62 skelehash string).
 *
 * @param {object} file - Raw attachment file object from libdashstore.
 * @returns {Promise<object>} Formatted attachment with `skeledash` and without `thumbavif`.
 */
export async function formatAttachment(file) {
    if (!file || typeof file !== 'object') return file;

    let skeledash = file.skeledash || file.skelehash || file.meta?.skeledash || file.meta?.skelehash || null;

    if (!skeledash && file.hash && skeleCache.has(file.hash)) {
        skeledash = skeleCache.get(file.hash);
    }

    if (!skeledash && file.thumbavif) {
        const result = await computeSkeleHash(file.thumbavif);
        skeledash = result.base62;
        if (file.hash && skeledash) {
            skeleCache.set(file.hash, skeledash);
        }
    }

    const { thumbavif: _thumbavif, ...rest } = file;

    return {
        ...rest,
        skeledash,
        skelehash: skeledash,
    };
}

/**
 * Formats a list of attachments in parallel.
 *
 * @param {Array<object>} files - Array of raw file attachment objects.
 * @returns {Promise<Array<object>>}
 */
export async function formatAttachments(files = []) {
    if (!Array.isArray(files) || files.length === 0) return [];
    return Promise.all(files.map(formatAttachment));
}