feat: add eager image processing functions (generateAllSizes, convertOriginalToWebp)

server/src/lib/image-resize.js

@@ -64,3 +64,56 @@ export async function getOrCreateResized(uuid, width, format, subdir = '') {
 }
 
 export { VALID_WIDTHS, SUPPORTED_FORMATS }
+
+/**
+ * Generate all resize widths in AVIF + WebP for eager processing.
+ * @param {string} uuid - UUID without extension
+ * @param {string} subdir - Subdirectory (e.g., 'reviews') or empty
+ * @param {string} originalPath - Full path to the original file
+ */
+export async function generateAllSizes(uuid, subdir, originalPath) {
+  const cacheSubdir = subdir ? subdir : ''
+  const cacheDir = path.join(CACHE_DIR, cacheSubdir)
+  await fs.promises.mkdir(cacheDir, { recursive: true })
+
+  const sharp = (await import('sharp')).default
+
+  for (const width of VALID_WIDTHS) {
+    for (const format of SUPPORTED_FORMATS) {
+      const cacheFileName = `${uuid}_w${width}.${format}`
+      const cachePath = path.join(CACHE_DIR, cacheSubdir, cacheFileName)
+
+      const pipeline = sharp(originalPath).resize(width, null, { withoutEnlargement: true })
+      const options = format === 'avif' ? { quality: 75, effort: 4 } : { quality: 80 }
+      await pipeline[format](options).toFile(cachePath)
+    }
+  }
+}
+
+/**
+ * Convert original file to WebP and delete the source file.
+ * @param {string} uuid - UUID without extension
+ * @param {string} subdir - Subdirectory (e.g., 'reviews') or empty
+ * @returns {string} New URL path like `/uploads/<uuid>.webp`
+ */
+export async function convertOriginalToWebp(uuid, subdir) {
+  const uploadsDir = path.join(process.cwd(), 'uploads')
+  const targetDir = subdir ? path.join(uploadsDir, subdir) : uploadsDir
+
+  const originalPath = await findOriginalFile(uuid, subdir)
+  if (!originalPath) {
+    throw new Error(`Original file not found for UUID: ${uuid}`)
+  }
+
+  const originalExt = path.extname(originalPath).toLowerCase()
+  const webpPath = path.join(targetDir, `${uuid}.webp`)
+
+  const sharp = (await import('sharp')).default
+  await sharp(originalPath).webp({ quality: 80 }).toFile(webpPath)
+
+  if (originalExt !== '.webp') {
+    await fs.promises.unlink(originalPath)
+  }
+
+  return subdir ? `/uploads/${subdir}/${uuid}.webp` : `/uploads/${uuid}.webp`
+}