// 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.

library pub.command.cache_repair;

import 'dart:async';

import '../command.dart';
import '../exit_codes.dart' as exit_codes;
import '../io.dart';
import '../log.dart' as log;
import '../utils.dart';

/// Handles the `cache repair` pub command.
class CacheRepairCommand extends PubCommand {
  String get description => "Reinstall cached packages.";
  String get usage => "pub cache repair";
  bool get requiresEntrypoint => false;

  Future onRun() {
    var successes = 0;
    var failures = 0;

    // Repair every cached source.
    return Future.forEach(cache.sources.where(
        (source) => source.shouldCache), (source) {
      return source.repairCachedPackages().then((results) {
        successes += results.first;
        failures += results.last;
      });
    }).then((_) {
      if (successes > 0) {
        var packages = pluralize("package", successes);
        log.message("Reinstalled ${log.green(successes)} $packages.");
      }

      if (failures > 0) {
        var packages = pluralize("package", failures);
        log.message("Failed to reinstall ${log.red(failures)} $packages.");
      }

      if (successes == 0 && failures == 0) {
        log.message("No packages in cache, so nothing to repair.");
      }

      if (failures > 0) return flushThenExit(exit_codes.UNAVAILABLE);
    });
  }
}