// Publishes a new version (readme §2): npm run release -- <x.y.z> [--no-push] [--skip-checks]
//
// 1. checks (clean tree on main, tests and lint), bumps the version;
// 2. builds the Windows exes (npm run dist);
// 3. stores the game files (app.asar, its unpacked natives, assets/) with a manifest.json in a
//    parentless commit at refs/builds/v<x.y.z>, next to the tag v<x.y.z> of the source;
// 4. pushes main, the tag and the build: installed games pick it up at their next launch.
import { execFileSync, execSync } from 'node:child_process';
import { createHash } from 'node:crypto';
import { mkdtempSync, readdirSync, readFileSync, rmSync, statSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join, relative, resolve } from 'node:path';
import { BUILD_REF_PREFIX, compareVersions, isVersion, MANIFEST_FILE, type BuildManifest } from '../src/main/updates';

const root = resolve(import.meta.dirname, '..');
const resources = join(root, 'dist', 'win-unpacked', 'resources');
/** What a build carries: everything else in resources/ belongs to the installed runtime. */
const PAYLOAD = ['app.asar', 'app.asar.unpacked', 'assets'];

const args = process.argv.slice(2);
const version = args.find((a) => !a.startsWith('--')) ?? '';
const push = !args.includes('--no-push');
const checks = !args.includes('--skip-checks');

function run(cmd: string, cmdArgs: string[], env?: NodeJS.ProcessEnv): string {
  return execFileSync(cmd, cmdArgs, { cwd: root, encoding: 'utf8', env: { ...process.env, ...env }, stdio: ['pipe', 'pipe', 'inherit'] }).trim();
}
const git = (...a: string[]): string => run('git', a);
function npm(...a: string[]): void {
  console.log(`\n> npm ${a.join(' ')}`);
  execSync(`npm ${a.join(' ')}`, { cwd: root, stdio: 'inherit' });
}
function fail(message: string): never {
  console.error(`\n✗ ${message}`);
  process.exit(1);
}

function listFiles(dir: string): string[] {
  return readdirSync(dir, { withFileTypes: true }).flatMap((e) =>
    e.isDirectory() ? listFiles(join(dir, e.name)) : [join(dir, e.name)],
  );
}

/** Writes the payload into the git object store and returns the commit of the build. */
function commitBuild(): string {
  const electron = (JSON.parse(readFileSync(join(root, 'node_modules', 'electron', 'package.json'), 'utf8')) as { version: string }).version;
  const files = PAYLOAD.flatMap((p) => {
    const abs = join(resources, p);
    return statSync(abs).isDirectory() ? listFiles(abs) : [abs];
  });
  const manifest: BuildManifest = {
    version,
    electron,
    files: files.map((abs) => ({
      path: relative(resources, abs).split('\\').join('/'),
      size: statSync(abs).size,
      sha256: createHash('sha256').update(readFileSync(abs)).digest('hex'),
    })),
  };
  // A throwaway index, so the working tree and the real index stay untouched.
  const tmp = mkdtempSync(join(tmpdir(), 'goutermageddon-release-'));
  const env = { GIT_INDEX_FILE: join(tmp, 'index') };
  try {
    const add = (path: string, blob: string): void => {
      run('git', ['update-index', '--add', '--cacheinfo', `100644,${blob},${path}`], env);
    };
    for (const [i, f] of manifest.files.entries()) add(f.path, run('git', ['hash-object', '-w', '--no-filters', '--', files[i]]));
    const manifestBlob = execFileSync('git', ['hash-object', '-w', '--no-filters', '--stdin'], { cwd: root, input: JSON.stringify(manifest, null, 1), encoding: 'utf8' }).trim();
    add(MANIFEST_FILE, manifestBlob);
    const tree = run('git', ['write-tree'], env);
    const size = manifest.files.reduce((s, f) => s + f.size, 0);
    console.log(`\nBuild v${version}: ${manifest.files.length} files, ${(size / 1e6).toFixed(1)} MB (Electron ${electron})`);
    return git('commit-tree', tree, '-m', `build v${version}`);
  } finally {
    rmSync(tmp, { recursive: true, force: true });
  }
}

const current = (JSON.parse(readFileSync(join(root, 'package.json'), 'utf8')) as { version: string }).version;
if (!isVersion(version)) fail(`usage: npm run release -- <x.y.z>   (current version: ${current})`);
if (compareVersions(version, current) <= 0) fail(`${version} must be newer than the current version ${current}`);
if (git('rev-parse', '--abbrev-ref', 'HEAD') !== 'main') fail('releases are made from main');
if (git('status', '--porcelain', '--untracked-files=no')) fail('commit or stash your changes first');
if (git('tag', '--list', `v${version}`)) fail(`tag v${version} already exists`);

if (checks) {
  npm('test');
  npm('run', 'lint');
}
npm('version', version, '--no-git-tag-version');
try {
  npm('run', 'dist');
} catch {
  git('checkout', '--', 'package.json', 'package-lock.json');
  fail('build failed; version bump undone');
}

const build = commitBuild();
git('commit', '-q', '-m', `chore: release v${version}`, '--', 'package.json', 'package-lock.json');
git('tag', '-a', `v${version}`, '-m', `v${version}`);
git('update-ref', `${BUILD_REF_PREFIX}${version}`, build);
console.log(`Tag v${version} and ${BUILD_REF_PREFIX}${version} (${build.slice(0, 7)}) created.`);

if (push) {
  console.log('\n> git push');
  execFileSync('git', ['push', 'origin', 'main', `v${version}`, `${BUILD_REF_PREFIX}${version}`], { cwd: root, stdio: 'inherit' });
  console.log(`\n✓ v${version} published: installed games update at their next launch.`);
} else {
  console.log(`\nNot pushed. To publish: git push origin main v${version} ${BUILD_REF_PREFIX}${version}`);
}
console.log(`First install for a new player: dist/Goutermageddon-${version}-setup.exe (or -portable.exe).`);