#!/usr/bin/env node
/**
 * Ensure the correct (stock) MainActivity.java exists in the generated Android
 * project.
 *
 * The AndroidManifest launches org.skatespots.app.MainActivity. If that class is
 * missing or wrong, the app crashes on launch (black screen). We keep the stock
 * source of truth in android-templates/MainActivity.java and copy it in on every
 * build so the launcher class is ALWAYS present and correct — even after
 * `rm -rf android` or `cap add` regenerate things.
 *
 * This version does NOT override the WebViewClient (a previous custom version
 * did and broke startup). Idempotent. Exits quietly if android/ isn't generated.
 */
import { readFileSync, writeFileSync, existsSync, mkdirSync, copyFileSync } from 'node:fs';
import { fileURLToPath } from 'node:url';
import { dirname, join } from 'node:path';

const root = join(dirname(fileURLToPath(import.meta.url)), '..');

const targetDir = join(root, 'android', 'app', 'src', 'main', 'java', 'org', 'skatespots', 'app');
const templatesDir = join(root, 'android-templates');

// Native Java sources kept as the source of truth in android-templates/ and
// copied into the generated project on every build. MainActivity registers the
// Amber ActivityResultLauncher; AmberIntentPlugin is the Amethyst-style NIP-55
// foreground signer that opens Amber's Approve/Reject screen and never hangs.
const files = ['MainActivity.java', 'AmberIntentPlugin.java'];

// If the android/ project hasn't been generated yet, do nothing.
if (!existsSync(join(root, 'android', 'app'))) {
  console.log('[inject-main-activity] android/ not generated yet — skipping.');
  process.exit(0);
}

if (!existsSync(targetDir)) {
  mkdirSync(targetDir, { recursive: true });
}

for (const file of files) {
  const template = join(templatesDir, file);
  const target = join(targetDir, file);

  if (!existsSync(template)) {
    console.error(`[inject-main-activity] template android-templates/${file} missing — aborting.`);
    process.exit(1);
  }

  const desired = readFileSync(template, 'utf8');
  const current = existsSync(target) ? readFileSync(target, 'utf8') : null;

  if (current === desired) {
    console.log(`[inject-main-activity] ${file} already correct.`);
    continue;
  }

  copyFileSync(template, target);
  console.log(`[inject-main-activity] ✓ Ensured ${file} is present (Amber foreground signer + safe launcher).`);
}