// 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:meta/meta.dart';
import 'package:platform/platform.dart';
import 'package:process/process.dart';

import '../base/file_system.dart';
import '../base/logger.dart';
import '../base/terminal.dart';
import '../globals.dart' as globals;
import '../runner/flutter_command.dart';
import 'analyze_continuously.dart';
import 'analyze_once.dart';

class AnalyzeCommand extends FlutterCommand {
  AnalyzeCommand({
    bool verboseHelp = false,
    this.workingDirectory,
    @required FileSystem fileSystem,
    @required Platform platform,
    @required AnsiTerminal terminal,
    @required Logger logger,
    @required ProcessManager processManager,
  }) : _fileSystem = fileSystem,
       _processManager = processManager,
       _logger = logger,
       _terminal = terminal,
       _platform = platform {
    addEnableExperimentation(verbose: verboseHelp);
    argParser.addFlag('flutter-repo',
        negatable: false,
        help: 'Include all the examples and tests from the Flutter repository.',
        defaultsTo: false,
        hide: !verboseHelp);
    argParser.addFlag('current-package',
        help: 'Analyze the current project, if applicable.', defaultsTo: true);
    argParser.addFlag('dartdocs',
        negatable: false,
        help: 'List every public member that is lacking documentation. '
              '(The public_member_api_docs lint must be enabled in analysis_options.yaml)',
        hide: !verboseHelp);
    argParser.addFlag('watch',
        help: 'Run analysis continuously, watching the filesystem for changes.',
        negatable: false);
    argParser.addOption('write',
        valueHelp: 'file',
        help: 'Also output the results to a file. This is useful with --watch '
              'if you want a file to always contain the latest results.');
    argParser.addOption('dart-sdk',
        valueHelp: 'path-to-sdk',
        help: 'The path to the Dart SDK.',
        hide: !verboseHelp);

    // Hidden option to enable a benchmarking mode.
    argParser.addFlag('benchmark',
        negatable: false,
        hide: !verboseHelp,
        help: 'Also output the analysis time.');

    usesPubOption();

    // Not used by analyze --watch
    argParser.addFlag('congratulate',
        help: 'Show output even when there are no errors, warnings, hints, or lints. '
              'Ignored if --watch is specified.',
        defaultsTo: true);
    argParser.addFlag('preamble',
        defaultsTo: true,
        help: 'When analyzing the flutter repository, display the number of '
              'files that will be analyzed.\n'
              'Ignored if --watch is specified.');
  }

  /// The working directory for testing analysis using dartanalyzer.
  final Directory workingDirectory;

  final FileSystem _fileSystem;
  final Logger _logger;
  final AnsiTerminal _terminal;
  final ProcessManager _processManager;
  final Platform _platform;

  @override
  String get name => 'analyze';

  @override
  String get description => "Analyze the project's Dart code.";

  @override
  bool get shouldRunPub {
    // If they're not analyzing the current project.
    if (!boolArg('current-package')) {
      return false;
    }

    // Or we're not in a project directory.
    if (!_fileSystem.file('pubspec.yaml').existsSync()) {
      return false;
    }

    return super.shouldRunPub;
  }

  @override
  Future<FlutterCommandResult> runCommand() async {
    if (boolArg('watch')) {
      await AnalyzeContinuously(
        argResults,
        runner.getRepoRoots(),
        runner.getRepoPackages(),
        fileSystem: _fileSystem,
        // TODO(jonahwilliams): determine a better way to inject the logger,
        // since it is constructed on-demand.
        logger: _logger ?? globals.logger,
        platform: _platform,
        processManager: _processManager,
        terminal: _terminal,
        experiments: stringsArg('enable-experiment'),
      ).analyze();
    } else {
      await AnalyzeOnce(
        argResults,
        runner.getRepoRoots(),
        runner.getRepoPackages(),
        workingDirectory: workingDirectory,
        fileSystem: _fileSystem,
        // TODO(jonahwilliams): determine a better way to inject the logger,
        // since it is constructed on-demand.
        logger: _logger ?? globals.logger,
        platform: _platform,
        processManager: _processManager,
        terminal: _terminal,
        experiments: stringsArg('enable-experiment'),
      ).analyze();
    }
    return FlutterCommandResult.success();
  }
}