// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'package:file/memory.dart';
import 'package:flutter_tools/src/base/file_system.dart';
import 'package:flutter_tools/src/build_system/build_system.dart';
import 'package:flutter_tools/src/cache.dart';
import 'package:flutter_tools/src/commands/build.dart';

import '../../../src/context.dart'; // legacy
import '../../../src/test_build_system.dart';
import '../../../src/test_flutter_command_runner.dart'; // legacy

void main() {
  setUpAll(() {
    Cache.flutterRoot = '';
    Cache.disableLocking();
  });

  group('ScrubGeneratedPluginRegistrant', () {
    // The files this migration deals with
    late File gitignore;
    late File registrant;

    // Environment overrides
    late FileSystem fileSystem;
    late ProcessManager processManager;
    late BuildSystem buildSystem;

    setUp(() {
      // Prepare environment overrides
      fileSystem = MemoryFileSystem.test();
      processManager = FakeProcessManager.any();
      buildSystem = TestBuildSystem.all(BuildResult(success: true));
      // Write some initial state into our testing filesystem
      setupFileSystemForEndToEndTest(fileSystem);
      // Initialize fileSystem references
      gitignore = fileSystem.file('.gitignore');
      registrant = fileSystem.file(fileSystem.path.join('lib', 'generated_plugin_registrant.dart'));
    });

    testUsingContext('noop - nothing to do - build runs', () async {
      expect(gitignore.existsSync(), isFalse);
      expect(registrant.existsSync(), isFalse);

      await createTestCommandRunner(BuildCommand())
          .run(<String>['build', 'web', '--no-pub']);

      final Directory buildDir = fileSystem.directory(fileSystem.path.join('build', 'web'));
      expect(buildDir.existsSync(), true);
    }, overrides: <Type, Generator> {
      FileSystem: () => fileSystem,
      ProcessManager: () => processManager,
      BuildSystem: () => buildSystem,
    });

    testUsingContext('noop - .gitignore does not reference generated_plugin_registrant.dart - untouched', () async {
      writeGitignore(fileSystem, mentionsPluginRegistrant: false);

      final String contentsBeforeBuild = gitignore.readAsStringSync();
      expect(contentsBeforeBuild, isNot(contains('lib/generated_plugin_registrant.dart')));

      await createTestCommandRunner(BuildCommand())
          .run(<String>['build', 'web', '--no-pub']);

      expect(gitignore.readAsStringSync(), contentsBeforeBuild);
    }, overrides: <Type, Generator> {
      FileSystem: () => fileSystem,
      ProcessManager: () => processManager,
      BuildSystem: () => buildSystem,
    });

    testUsingContext('.gitignore references generated_plugin_registrant - cleans it up', () async {
      writeGitignore(fileSystem);

      expect(gitignore.existsSync(), isTrue);
      expect(gitignore.readAsStringSync(), contains('lib/generated_plugin_registrant.dart'));

      await createTestCommandRunner(BuildCommand())
          .run(<String>['build', 'web', '--no-pub']);

      expect(gitignore.readAsStringSync(), isNot(contains('lib/generated_plugin_registrant.dart')));
    }, overrides: <Type, Generator> {
      FileSystem: () => fileSystem,
      ProcessManager: () => processManager,
      BuildSystem: () => buildSystem,
    });

    testUsingContext('generated_plugin_registrant.dart exists - gets deleted', () async {
      writeGeneratedPluginRegistrant(fileSystem);

      expect(registrant.existsSync(), isTrue);

      await createTestCommandRunner(BuildCommand())
          .run(<String>['build', 'web', '--no-pub']);

      expect(registrant.existsSync(), isFalse);
    }, overrides: <Type, Generator> {
      FileSystem: () => fileSystem,
      ProcessManager: () => processManager,
      BuildSystem: () => buildSystem,
    });

    testUsingContext('scrubs generated_plugin_registrant file and cleans .gitignore', () async {
      writeGitignore(fileSystem);
      writeGeneratedPluginRegistrant(fileSystem);

      expect(registrant.existsSync(), isTrue);
      expect(gitignore.readAsStringSync(), contains('lib/generated_plugin_registrant.dart'));

      await createTestCommandRunner(BuildCommand())
          .run(<String>['build', 'web', '--no-pub']);

      expect(registrant.existsSync(), isFalse);
      expect(gitignore.readAsStringSync(), isNot(contains('lib/generated_plugin_registrant.dart')));
    }, overrides: <Type, Generator>{
      FileSystem: () => fileSystem,
      ProcessManager: () => processManager,
      BuildSystem: () => buildSystem,
    });
  });
}

// Writes something that resembles the contents of Flutter's .gitignore file
void writeGitignore(FileSystem fs, { bool mentionsPluginRegistrant = true }) {
  fs.file('.gitignore').createSync(recursive: true);
  fs.file('.gitignore')
      .writeAsStringSync('''
/build/

# Web related
${mentionsPluginRegistrant ? 'lib/generated_plugin_registrant.dart':'another_file.dart'}

# Symbolication related
''');
}

// Creates an empty generated_plugin_registrant.dart file
void writeGeneratedPluginRegistrant(FileSystem fs) {
  final String path = fs.path.join('lib', 'generated_plugin_registrant.dart');
  fs.file(path).createSync(recursive: true);
}

// Adds a bunch of files to the filesystem
// (taken from commands.shard/hermetic/build_web_test.dart)
void setupFileSystemForEndToEndTest(FileSystem fileSystem) {
  final List<String> dependencies = <String>[
    '.packages',
    fileSystem.path.join('web', 'index.html'),
    fileSystem.path.join('lib', 'main.dart'),
    fileSystem.path.join('packages', 'flutter_tools', 'lib', 'src', 'build_system', 'targets', 'web.dart'),
    fileSystem.path.join('bin', 'cache', 'flutter_web_sdk'),
    fileSystem.path.join('bin', 'cache', 'dart-sdk', 'bin', 'snapshots', 'dart2js.dart.snapshot'),
    fileSystem.path.join('bin', 'cache', 'dart-sdk', 'bin', 'dart'),
    fileSystem.path.join('bin', 'cache', 'dart-sdk '),
  ];
  for (final String dependency in dependencies) {
    fileSystem.file(dependency).createSync(recursive: true);
  }

  // Project files.
  fileSystem.file('.packages')
      .writeAsStringSync('''
foo:lib/
fizz:bar/lib/
''');
  fileSystem.file('pubspec.yaml')
      .writeAsStringSync('''
name: foo

dependencies:
  flutter:
    sdk: flutter
  fizz:
    path:
      bar/
''');
  fileSystem.file(fileSystem.path.join('bar', 'pubspec.yaml'))
    ..createSync(recursive: true)
    ..writeAsStringSync('''
name: bar

flutter:
  plugin:
    platforms:
      web:
        pluginClass: UrlLauncherPlugin
        fileName: url_launcher_web.dart
''');
  fileSystem.file(fileSystem.path.join('bar', 'lib', 'url_launcher_web.dart'))
    ..createSync(recursive: true)
    ..writeAsStringSync('''
class UrlLauncherPlugin {}
''');
  fileSystem.file(fileSystem.path.join('lib', 'main.dart'))
      .writeAsStringSync('void main() { }');
}