// The checks every push has to pass: the packages the lock names, formatting,
// static analysis (infos are fatal too), and every package's tests. The
// pre-push hook (tool/pre-push) runs it, and so does CI on every push
// (.forgejo/workflows/ci.yaml).
//
//   dart run tool/check.dart                           everything
//   dart run tool/check.dart --changed-since=origin/main
//                         the tests of what changed since then, and of what
//                         depends on it
//
// The tests run through Melos' scripts (`test:dart`, `test:flutter`, the root
// pubspec), Melos itself a dependency of the root.
// It checks the working tree, so uncommitted changes count as well.
import 'dart:io';

import 'package:args/args.dart';

import 'src/check_files.dart';

Future<void> main(List<String> arguments) async {
  final options =
      (ArgParser()
            ..addOption(
              'changed-since',
              help:
                  'Test only the packages changed since this commit, and those '
                  'depending on them.',
            )
            ..addFlag('help', abbr: 'h', negatable: false))
          .parse(arguments);
  if (options.flag('help')) {
    stdout.writeln(
      'Usage: dart run tool/check.dart [--changed-since=<commit>]',
    );
    return;
  }
  final changedSince = options.option('changed-since');

  Directory.current = (await _output('git', [
    'rev-parse',
    '--show-toplevel',
  ])).trim();
  if ((await Process.run('git', ['diff', '--quiet', 'HEAD'])).exitCode != 0) {
    stdout.writeln(
      'Note: the working tree has uncommitted changes; they are checked too.',
    );
  }

  // The packages the checked-out pubspecs and lock name, fetched first: after
  // a merge or a switch of branch the workspace's resolution can still be the
  // one from before, and the analysis then failed on packages it couldn't
  // find (2026-10-13, 2026-10-17). The lock decides (--enforce-lockfile), so a
  // check never changes it.
  await _step('Packages', [
    ('flutter', ['pub', 'get', '--enforce-lockfile']),
  ], quiet: true);

  final own = (await _output('git', [
    'ls-files',
    '*.dart',
  ])).split('\n').where(isOwnDartFile).toList();
  await _step('Formatting', [
    ('dart', ['format', '--output=none', '--set-exit-if-changed', ...own]),
  ]);

  await _step('Analysis', [
    ('dart', ['analyze', '--fatal-infos']),
  ]);

  await _step('Tools', [
    ('dart', ['test', 'test/']),
  ]);

  // The sync tests need `serverpod start` running (`requires-server`); run
  // them by hand with `flutter test -t requires-server` in Learn's app.
  final filters = melosFilters(changedSince: changedSince);
  await _step('Tests', [
    ('dart', ['run', 'melos', 'run', 'test:dart', ...filters]),
    ('dart', ['run', 'melos', 'run', 'test:flutter', ...filters]),
  ]);

  stdout.writeln('✓ All checks passed.');
}

/// Runs [commands] one after another as the step [name], and ends the check
/// at the first that fails, with its exit code.
Future<void> _step(
  String name,
  List<(String, List<String>)> commands, {
  bool quiet = false,
}) async {
  stdout.writeln('▸ $name');
  for (final (executable, arguments) in commands) {
    final code = await _run(executable, arguments, quiet: quiet);
    if (code != 0) {
      stderr.writeln('✗ $name failed ($executable ${arguments.first}).');
      exit(code);
    }
  }
}

/// Runs [executable] and returns its exit code; its output is passed on as
/// it comes, or if [quiet] only should it fail.
Future<int> _run(
  String executable,
  List<String> arguments, {
  bool quiet = false,
}) async {
  if (quiet) {
    final result = await Process.run(executable, arguments);
    if (result.exitCode != 0) {
      stderr
        ..write(result.stdout)
        ..write(result.stderr);
    }
    return result.exitCode;
  }
  final process = await Process.start(
    executable,
    arguments,
    mode: ProcessStartMode.inheritStdio,
  );
  return await process.exitCode;
}

/// What [executable] writes, failing the check if it fails.
Future<String> _output(String executable, List<String> arguments) async {
  final result = await Process.run(executable, arguments);
  if (result.exitCode != 0) {
    stderr.write(result.stderr);
    exit(result.exitCode);
  }
  return result.stdout as String;
}