// 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 'dart:async';

import 'package:file/memory.dart';
import 'package:flutter_tools/src/base/file_system.dart';
import 'package:flutter_tools/src/base/io.dart';
import 'package:flutter_tools/src/base/logger.dart';
import 'package:flutter_tools/src/base/terminal.dart';
import 'package:flutter_tools/src/dart/analysis.dart';
import 'package:flutter_tools/src/dart/pub.dart';
import 'package:flutter_tools/src/dart/sdk.dart';
import 'package:flutter_tools/src/runner/flutter_command_runner.dart';
import 'package:platform/platform.dart';
import 'package:process/process.dart';

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

void main() {
  AnalysisServer server;
  Directory tempDir;
  FileSystem fileSystem;
  Platform platform;
  ProcessManager processManager;
  AnsiTerminal terminal;
  Logger logger;

  setUp(() {
    platform = const LocalPlatform();
    fileSystem = const LocalFileSystem();
    platform = const LocalPlatform();
    processManager = const LocalProcessManager();
    terminal = AnsiTerminal(platform: platform, stdio: Stdio());
    logger = BufferLogger(outputPreferences: OutputPreferences.test(), terminal: terminal);
    FlutterCommandRunner.initFlutterRoot();
    tempDir = fileSystem.systemTempDirectory.createTempSync('flutter_analysis_test.');
  });

  tearDown(() {
    tryToDelete(tempDir);
    return server?.dispose();
  });


  void _createSampleProject(Directory directory, { bool brokenCode = false }) {
    final File pubspecFile = fileSystem.file(fileSystem.path.join(directory.path, 'pubspec.yaml'));
    pubspecFile.writeAsStringSync('''
  name: foo_project
  ''');

    final File dartFile = fileSystem.file(fileSystem.path.join(directory.path, 'lib', 'main.dart'));
    dartFile.parent.createSync();
    dartFile.writeAsStringSync('''
  void main() {
    print('hello world');
    ${brokenCode ? 'prints("hello world");' : ''}
  }
  ''');
  }

  group('analyze --watch', () {
    testUsingContext('AnalysisServer success', () async {
      _createSampleProject(tempDir);

      await const Pub().get(context: PubContext.flutterTests, directory: tempDir.path);

      server = AnalysisServer(dartSdkPath, <String>[tempDir.path],
        fileSystem: fileSystem,
        platform: platform,
        processManager: processManager,
        logger: logger,
        terminal: terminal,
        experiments: <String>[],
      );

      int errorCount = 0;
      final Future<bool> onDone = server.onAnalyzing.where((bool analyzing) => analyzing == false).first;
      server.onErrors.listen((FileAnalysisErrors errors) => errorCount += errors.errors.length);

      await server.start();
      await onDone;

      expect(errorCount, 0);
    });
  });

  testUsingContext('AnalysisServer errors', () async {
    _createSampleProject(tempDir, brokenCode: true);

    await const Pub().get(context: PubContext.flutterTests, directory: tempDir.path);

    server = AnalysisServer(dartSdkPath, <String>[tempDir.path],
      fileSystem: fileSystem,
      platform: platform,
      processManager: processManager,
      logger: logger,
      terminal: terminal,
      experiments: <String>[],
    );

    int errorCount = 0;
    final Future<bool> onDone = server.onAnalyzing.where((bool analyzing) => analyzing == false).first;
    server.onErrors.listen((FileAnalysisErrors errors) {
      errorCount += errors.errors.length;
    });

    await server.start();
    await onDone;

    expect(errorCount, greaterThan(0));
  });

  testUsingContext('Returns no errors when source is error-free', () async {
    const String contents = "StringBuffer bar = StringBuffer('baz');";
    tempDir.childFile('main.dart').writeAsStringSync(contents);
    server = AnalysisServer(dartSdkPath, <String>[tempDir.path],
      fileSystem: fileSystem,
      platform: platform,
      processManager: processManager,
      logger: logger,
      terminal: terminal,
      experiments: <String>[],
    );

    int errorCount = 0;
    final Future<bool> onDone = server.onAnalyzing.where((bool analyzing) => analyzing == false).first;
    server.onErrors.listen((FileAnalysisErrors errors) {
      errorCount += errors.errors.length;
    });
    await server.start();
    await onDone;
    expect(errorCount, 0);
  });

  testWithoutContext('Can forward null-safety experiments to the AnalysisServer', () async {
    final Completer<void> completer = Completer<void>();
    final StreamController<List<int>> stdin = StreamController<List<int>>();
    const String fakeSdkPath = 'dart-sdk';
    final FakeCommand fakeCommand = FakeCommand(
      command: const <String>[
        'dart-sdk/bin/dart',
        'dart-sdk/bin/snapshots/analysis_server.dart.snapshot',
        '--enable-experiment',
        'non-nullable',
        '--disable-server-feature-completion',
        '--disable-server-feature-search',
        '--sdk',
        'dart-sdk',
      ],
      completer: completer,
      stdin: IOSink(stdin.sink),
    );

    server = AnalysisServer(fakeSdkPath, <String>[''],
      fileSystem: MemoryFileSystem.test(),
      platform: FakePlatform(),
      processManager: FakeProcessManager.list(<FakeCommand>[
        fakeCommand,
      ]),
      logger: BufferLogger.test(),
      terminal: Terminal.test(),
      experiments: <String>[
        'non-nullable'
      ],
    );

    await server.start();
  });
}