// 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:flutter_tools/src/base/file_system.dart';
import 'package:flutter_tools/src/base/logger.dart';
import 'package:flutter_tools/src/base/platform.dart';
import 'package:flutter_tools/src/base/terminal.dart';
import 'package:flutter_tools/src/cache.dart';
import 'package:flutter_tools/src/commands/migrate.dart';
import 'package:flutter_tools/src/globals.dart' as globals;
import 'package:flutter_tools/src/migrate/migrate_utils.dart';

import '../../src/common.dart';
import '../../src/context.dart';
import '../../src/test_flutter_command_runner.dart';

void main() {
  late FileSystem fileSystem;
  late BufferLogger logger;
  late Platform platform;
  late Terminal terminal;
  late ProcessManager processManager;
  late Directory appDir;

  setUp(() {
    fileSystem = globals.localFileSystem;
    appDir = fileSystem.systemTempDirectory.createTempSync('apptestdir');
    logger = BufferLogger.test();
    platform = FakePlatform();
    terminal = Terminal.test();
    processManager = globals.processManager;
  });

  setUpAll(() {
    Cache.disableLocking();
  });

  tearDown(() async {
    tryToDelete(appDir);
  });

  testUsingContext('Apply produces all outputs', () async {
    final MigrateCommand command = MigrateCommand(
      verbose: true,
      logger: logger,
      fileSystem: fileSystem,
      terminal: terminal,
      platform: platform,
      processManager: processManager,
    );
    final Directory workingDir = appDir.childDirectory(kDefaultMigrateStagingDirectoryName);
    appDir.childFile('lib/main.dart').createSync(recursive: true);
    final File pubspecOriginal = appDir.childFile('pubspec.yaml');
    pubspecOriginal.createSync();
    pubspecOriginal.writeAsStringSync('''
name: originalname
description: A new Flutter project.
version: 1.0.0+1
environment:
  sdk: '>=2.18.0-58.0.dev <3.0.0'
dependencies:
  flutter:
    sdk: flutter
dev_dependencies:
  flutter_test:
    sdk: flutter
flutter:
  uses-material-design: true''', flush: true);

    final File gitignore = appDir.childFile('.gitignore');
    gitignore.createSync();
    gitignore.writeAsStringSync(kDefaultMigrateStagingDirectoryName, flush: true);

    logger.clear();
    await createTestCommandRunner(command).run(
      <String>[
        'migrate',
        'apply',
        '--staging-directory=${workingDir.path}',
        '--project-directory=${appDir.path}',
      ]
    );
    expect(logger.statusText, contains('Project is not a git repo. Please initialize a git repo and try again.'));

    await processManager.run(<String>['git', 'init'], workingDirectory: appDir.path);

    logger.clear();
    await createTestCommandRunner(command).run(
      <String>[
        'migrate',
        'apply',
        '--staging-directory=${workingDir.path}',
        '--project-directory=${appDir.path}',
      ]
    );
    expect(logger.statusText, contains('No migration in progress'));

    final File pubspecModified = workingDir.childFile('pubspec.yaml');
    pubspecModified.createSync(recursive: true);
    pubspecModified.writeAsStringSync('''
name: newname
description: new description of the test project
version: 1.0.0+1
environment:
  sdk: '>=2.18.0-58.0.dev <3.0.0'
dependencies:
  flutter:
    sdk: flutter
dev_dependencies:
  flutter_test:
    sdk: flutter
flutter:
  uses-material-design: false
  # EXTRALINE:''', flush: true);

    final File addedFile = workingDir.childFile('added.file');
    addedFile.createSync(recursive: true);
    addedFile.writeAsStringSync('new file contents');

    final File manifestFile = workingDir.childFile('.migrate_manifest');
    manifestFile.createSync(recursive: true);
    manifestFile.writeAsStringSync('''
merged_files:
  - pubspec.yaml
conflict_files:
  - conflict/conflict.file
added_files:
  - added.file
deleted_files:
''');

    // Add conflict file
    final File conflictFile = workingDir.childDirectory('conflict').childFile('conflict.file');
    conflictFile.createSync(recursive: true);
    conflictFile.writeAsStringSync('''
line1
<<<<<<< /conflcit/conflict.file
line2
=======
linetwo
>>>>>>> /var/folders/md/gm0zgfcj07vcsj6jkh_mp_wh00ff02/T/flutter_tools.4Xdep8/generatedTargetTemplatetlN44S/conflict/conflict.file
line3
''', flush: true);

    final File conflictFileOriginal = appDir.childDirectory('conflict').childFile('conflict.file');
    conflictFileOriginal.createSync(recursive: true);
    conflictFileOriginal.writeAsStringSync('''
line1
line2
line3
''', flush: true);

    logger.clear();
    await createTestCommandRunner(command).run(
      <String>[
        'migrate',
        'apply',
        '--staging-directory=${workingDir.path}',
        '--project-directory=${appDir.path}',
      ]
    );
    expect(logger.statusText, contains(r'''
Added files:
  - added.file
Modified files:
  - pubspec.yaml
Unable to apply migration. The following files in the migration working directory still have unresolved conflicts:
  - conflict/conflict.file
Conflicting files found. Resolve these conflicts and try again.
Guided conflict resolution wizard:

    $ flutter migrate resolve-conflicts'''));

    conflictFile.writeAsStringSync('''
line1
linetwo
line3
''', flush: true);

    logger.clear();
    await createTestCommandRunner(command).run(
      <String>[
        'migrate',
        'apply',
        '--staging-directory=${workingDir.path}',
        '--project-directory=${appDir.path}',
      ]
    );
    expect(logger.statusText, contains('There are uncommitted changes in your project. Please git commit, abandon, or stash your changes before trying again.'));

    await processManager.run(<String>['git', 'add', '.'], workingDirectory: appDir.path);
    await processManager.run(<String>['git', 'commit', '-m', 'Initial commit'], workingDirectory: appDir.path);

    logger.clear();
    await createTestCommandRunner(command).run(
      <String>[
        'migrate',
        'apply',
        '--staging-directory=${workingDir.path}',
        '--project-directory=${appDir.path}',
      ]
    );
    expect(logger.statusText, contains(r'''
Added files:
  - added.file
Modified files:
  - conflict/conflict.file
  - pubspec.yaml

Applying migration.
  Modifying 3 files.
Writing pubspec.yaml
Writing conflict/conflict.file
Writing added.file
Updating .migrate_configs
Migration complete. You may use commands like `git status`, `git diff` and `git restore <file>` to continue working with the migrated files.'''));

    expect(pubspecOriginal.readAsStringSync(), contains('# EXTRALINE'));
    expect(conflictFileOriginal.readAsStringSync(), contains('linetwo'));
    expect(appDir.childFile('added.file').existsSync(), true);
    expect(appDir.childFile('added.file').readAsStringSync(), contains('new file contents'));

  }, overrides: <Type, Generator>{
    FileSystem: () => fileSystem,
    ProcessManager: () => processManager,
    Platform: () => platform,
  });
}