import 'dart:io';

import 'package:pipe/pipe.dart';
import 'package:pipe/src/sdk.dart';
import 'package:test/test.dart';

/// A directory laid out like a Dart SDK: `bin/dart`, `lib/libraries.json`,
/// `version`.
Directory _fakeSdk(String label) {
  final sdk = Directory.systemTemp.createTempSync('pipe-$label');
  File('${sdk.path}/version').writeAsStringSync('3.13.0\n');
  File('${sdk.path}/lib/libraries.json')
    ..createSync(recursive: true)
    ..writeAsStringSync('{}');
  File('${sdk.path}/bin/dart').createSync(recursive: true);
  return sdk;
}

void main() {
  test('an SDK that exists but cannot be read is a clear error', () {
    // macOS privacy protection (a Flutter SDK under ~/Documents) lets stat
    // succeed while every open fails, so discovery accepted the SDK and the
    // analyzer later died with a raw FileSystemException stack trace.
    final sdk = _fakeSdk('unreadable-sdk');
    final version = File('${sdk.path}/version');
    Process.runSync('chmod', ['000', version.path]);
    try {
      version.readAsStringSync();
      markTestSkipped('chmod 000 does not restrict this process');
      return;
    } on FileSystemException {
      // Expected: the restriction is real, so the check below is meaningful.
    }

    final resolution = resolveSdk(explicit: sdk.path);
    expect(
      () => requireReadableSdk(resolution),
      throwsA(
        isA<PipeException>()
            .having((e) => e.message, 'message', contains(sdk.path))
            .having((e) => e.remedy, 'remedy', contains('--sdk')),
      ),
    );
  });

  test('a readable SDK passes the check', () {
    final sdk = _fakeSdk('readable-sdk');
    expect(
      () => requireReadableSdk(resolveSdk(explicit: sdk.path)),
      returnsNormally,
    );
  });

  test('the running dart binary maps to its SDK root, not to bin/', () {
    // dirname(<sdk>/bin/dart) is <sdk>/bin, which never contains
    // lib/libraries.json, so this fallback could never succeed.
    final sdk = _fakeSdk('runtime-sdk');
    expect(sdkFromExecutable('${sdk.path}/bin/dart'), sdk.path);
    expect(sdkFromExecutable('${sdk.path}/version'), isNull);
  });
}