/**
 * Node-side multipart upload helper. Lets adversarial specs post arbitrary
 * bytes with arbitrary `Content-Type` claims to /api/v1/upload without
 * driving the UI. Crucial for MIME-spoofing, oversize, polyglot, and
 * filename-injection tests.
 *
 * Field shape matches [backend/src/handlers/upload.rs]:
 *   - file       (binary; carries filename + content_type in the part headers)
 *   - caption    (text, optional)
 *   - hashtags   (CSV text, optional)
 */
// Node 22+ ships FormData and Blob as globals — no import needed.

const BASE = process.env.E2E_FRONTEND_URL ?? 'http://localhost:3101';

export type UploadOptions = {
  filename?: string;
  contentType?: string;
  caption?: string;
  hashtags?: string;
};

export async function uploadRaw(token: string, body: Uint8Array | Buffer, opts: UploadOptions = {}) {
  const form = new FormData();
  const blob = new Blob([body as any], { type: opts.contentType ?? 'application/octet-stream' });
  form.append('file', blob as any, opts.filename ?? 'upload.bin');
  if (opts.caption !== undefined) form.append('caption', opts.caption);
  if (opts.hashtags !== undefined) form.append('hashtags', opts.hashtags);
  return fetch(`${BASE}/api/v1/upload`, {
    method: 'POST',
    headers: { Authorization: `Bearer ${token}` },
    body: form as any,
  });
}

/** Convenience: read a fixture from disk and upload it. */
export async function uploadFile(token: string, path: string, opts: UploadOptions = {}) {
  const { readFile } = await import('node:fs/promises');
  const body = await readFile(path);
  return uploadRaw(token, body, opts);
}

/** Tiny valid JPEG header — magic bytes only, useful for "claim image but is N MB of zeros" tests. */
export const JPEG_MAGIC = new Uint8Array([0xff, 0xd8, 0xff, 0xe0, 0x00, 0x10, 0x4a, 0x46, 0x49, 0x46]);
/** Tiny valid PNG magic bytes. */
export const PNG_MAGIC = new Uint8Array([0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a]);
/** ELF header — the magic bytes of a Linux executable. `infer` reports `application/x-executable`. */
export const ELF_MAGIC = new Uint8Array([0x7f, 0x45, 0x4c, 0x46]);