// Copyright (c) 2014, 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 'package:pub_semver/pub_semver.dart';

import '../command.dart';
import '../command_runner.dart';
import '../io.dart';
import '../package_name.dart';
import '../pubspec.dart';
import '../utils.dart';

/// Handles the `global activate` pub command.
class GlobalActivateCommand extends PubCommand {
  @override
  String get name => 'activate';
  @override
  String get description => "Make a package's executables globally available.";
  @override
  String get argumentsDescription => '<package> [version-constraint]';

  GlobalActivateCommand() {
    argParser.addOption(
      'source',
      abbr: 's',
      help: 'The source used to find the package.',
      allowed: ['git', 'hosted', 'path'],
      defaultsTo: 'hosted',
    );

    argParser.addOption('git-path', help: 'Path of git package in repository');

    argParser.addOption(
      'git-ref',
      help: 'Git branch or commit to be retrieved',
    );

    argParser.addMultiOption(
      'features',
      abbr: 'f',
      help: 'Feature(s) to enable.',
      hide: true,
    );

    argParser.addMultiOption(
      'omit-features',
      abbr: 'F',
      help: 'Feature(s) to disable.',
      hide: true,
    );

    argParser.addFlag(
      'no-executables',
      negatable: false,
      help: 'Do not put executables on PATH.',
    );

    argParser.addMultiOption(
      'executable',
      abbr: 'x',
      help: 'Executable(s) to place on PATH.',
    );

    argParser.addFlag(
      'overwrite',
      negatable: false,
      help: 'Overwrite executables from other packages with the same name.',
    );

    argParser.addOption(
      'hosted-url',
      abbr: 'u',
      help:
          'A custom pub server URL for the package. '
          'Only applies when using the `hosted` source.',
    );
  }

  @override
  Future<void> runProtected() async {
    // Default to `null`, which means all executables.
    List<String>? executables;
    if (argResults.wasParsed('executable')) {
      if (argResults.wasParsed('no-executables')) {
        usageException('Cannot pass both --no-executables and --executable.');
      }

      executables = argResults.multiOption('executable');
    } else if (argResults.flag('no-executables')) {
      // An empty list means no executables.
      executables = [];
    }

    final overwrite = argResults.flag('overwrite');

    Iterable<String> args = argResults.rest;

    String readArg([String error = '']) {
      if (args.isEmpty) usageException(error);
      final arg = args.first;
      args = args.skip(1);
      return arg;
    }

    void validateNoExtraArgs() {
      if (args.isEmpty) return;
      final unexpected = args.map((arg) => '"$arg"');
      final arguments = pluralize('argument', unexpected.length);
      usageException('Unexpected $arguments ${toSentence(unexpected)}.');
    }

    if (argResults.optionWithDefault('source') != 'git' &&
        (argResults.option('git-path') != null ||
            argResults.option('git-ref') != null)) {
      usageException(
        'Options `--git-path` and `--git-ref` '
        'can only be used with --source=git.',
      );
    }

    switch (argResults.optionWithDefault('source')) {
      case 'git':
        final repo = readArg('No Git repository given.');
        validateNoExtraArgs();
        return globals.activateGit(
          repo,
          executables,
          overwriteBinStubs: overwrite,
          path: argResults.option('git-path'),
          ref: argResults.option('git-ref'),
        );

      case 'hosted':
        final package = readArg('No package to activate given.');

        PackageRef ref;
        try {
          ref = cache.hosted.refFor(
            package,
            url: argResults.option('hosted-url'),
          );
        } on FormatException catch (e) {
          usageException('Invalid hosted-url: $e');
        }

        // Parse the version constraint, if there is one.
        var constraint = VersionConstraint.any;
        if (args.isNotEmpty) {
          try {
            constraint = VersionConstraint.parse(readArg());
          } on FormatException catch (error) {
            usageException(error.message);
          }
        }

        validateNoExtraArgs();

        if (!packageNameRegExp.hasMatch(package)) {
          final suggestion =
              dirExists(package)
                  ? '\n\nDid you mean `$topLevelProgram pub global activate '
                      '--source path ${escapeShellArgument(package)}`?'
                  : '';

          usageException('Not a valid package name: "$package"$suggestion');
        }
        return globals.activateHosted(
          ref.withConstraint(constraint),
          executables,
          overwriteBinStubs: overwrite,
        );

      case 'path':
        final path = readArg('No package to activate given.');
        validateNoExtraArgs();
        return globals.activatePath(
          path,
          executables,
          overwriteBinStubs: overwrite,
        );
    }

    throw StateError('unreachable');
  }
}