// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
// for details. 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 '../command.dart';
import '../log.dart' as log;
import '../solver.dart';

/// Handles the `upgrade` pub command.
class UpgradeCommand extends PubCommand {
  String get name => "upgrade";
  String get description =>
      "Upgrade the current package's dependencies to latest versions.";
  String get invocation => "pub upgrade [dependencies...]";
  String get docUrl => "http://dartlang.org/tools/pub/cmd/pub-upgrade.html";
  List<String> get aliases => const ["update"];

  bool get isOffline => argResults['offline'];

  UpgradeCommand() {
    argParser.addFlag('offline',
        help: 'Use cached packages instead of accessing the network.');

    argParser.addFlag('dry-run',
        abbr: 'n',
        negatable: false,
        help: "Report what dependencies would change but don't change any.");

    argParser.addFlag('precompile',
        defaultsTo: true,
        help: "Precompile executables and transformed dependencies.");

    argParser.addFlag('packages-dir',
        negatable: true,
        help: "Generate a packages/ directory when installing packages.");
  }

  Future run() async {
    await entrypoint.acquireDependencies(SolveType.UPGRADE,
        useLatest: argResults.rest,
        dryRun: argResults['dry-run'],
        precompile: argResults['precompile'],
        packagesDir: argResults['packages-dir']);

    if (isOffline) {
      log.warning("Warning: Upgrading when offline may not update you to the "
          "latest versions of your dependencies.");
    }
  }
}