import { app } from 'electron'
import { join } from 'path'
import { accessSync, mkdirSync, constants } from 'fs'

/**
 * When running as the portable build, keep all per-user data (settings, history,
 * caches — everything under `userData`) in an `AeroFetch-data` folder right next to
 * the portable .exe. That makes the app fully self-contained on a USB stick and
 * leaves nothing behind on a shared/library PC.
 *
 * Detection: electron-builder's `portable` target sets PORTABLE_EXECUTABLE_DIR at
 * runtime to the folder the user launched the exe from. The installed (NSIS) build
 * and dev don't set it, so they correctly use the default %APPDATA%\AeroFetch —
 * which is per-user and never requires admin either.
 *
 * If the portable folder is read-only (locked-down machine, read-only media), we
 * silently fall back to %APPDATA%. Either way the app needs no admin privileges.
 *
 * Must be called at startup, before the app is ready and before anything reads a
 * user path (electron-store, history DB, etc.).
 */
export function setupPortableData(): void {
  const portableExeDir = process.env.PORTABLE_EXECUTABLE_DIR
  if (!portableExeDir) return

  const portableDataDir = join(portableExeDir, 'AeroFetch-data')
  try {
    mkdirSync(portableDataDir, { recursive: true })
    accessSync(portableDataDir, constants.W_OK)
    app.setPath('userData', portableDataDir)
  } catch {
    // Read-only media — keep the default %APPDATA% userData (per-user, no admin).
  }
}