/**
 * Server-side HEIC conversion using heic-convert (Node). Use in form actions only.
 */

export function isHeicFile(file: File): boolean {
  const name = file.name.toLowerCase();
  const type = (file.type ?? "").toLowerCase();
  return (
    name.endsWith(".heic") ||
    name.endsWith(".heif") ||
    type === "image/heic" ||
    type === "image/heif"
  );
}

/**
 * If the file is HEIC/HEIF, convert to JPEG and return a new File. Otherwise return the original.
 */
export async function convertHeicFileToJpegIfNeeded(file: File): Promise<File> {
  if (!isHeicFile(file)) return file;

  const arrayBuffer = await file.arrayBuffer();
  const inputBuffer = Buffer.from(arrayBuffer);
  const convert = (await import("heic-convert")).default as (opts: {
    buffer: Buffer;
    format: string;
    quality?: number;
  }) => Promise<Buffer>;
  const outputBuffer = await convert({
    buffer: inputBuffer,
    format: "JPEG",
    quality: 0.92,
  });
  const baseName = file.name.replace(/\.[^.]+$/i, "") || "image";
  return new File([outputBuffer], `${baseName}.jpg`, {
    type: "image/jpeg",
    lastModified: Date.now(),
  });
}