/// <summary>
        /// Implements the 'add-subscription' operation
        /// </summary>
        /// <param name="options"></param>
        public override async Task <int> ExecuteAsync()
        {
            IRemote remote = RemoteFactory.GetBarOnlyRemote(_options, Logger);

            if (_options.IgnoreChecks.Count() > 0 && !_options.AllChecksSuccessfulMergePolicy)
            {
                Console.WriteLine($"--ignore-checks must be combined with --all-checks-passed");
                return(Constants.ErrorCode);
            }

            // Parse the merge policies
            List <MergePolicy> mergePolicies = new List <MergePolicy>();

            if (_options.NoExtraCommitsMergePolicy)
            {
                mergePolicies.Add(
                    new MergePolicy
                {
                    Name = MergePolicyConstants.NoExtraCommitsMergePolicyName
                });
            }

            if (_options.AllChecksSuccessfulMergePolicy)
            {
                mergePolicies.Add(
                    new MergePolicy
                {
                    Name       = MergePolicyConstants.AllCheckSuccessfulMergePolicyName,
                    Properties = ImmutableDictionary.Create <string, JToken>()
                                 .Add(MergePolicyConstants.IgnoreChecksMergePolicyPropertyName, JToken.FromObject(_options.IgnoreChecks))
                });
            }

            if (_options.NoRequestedChangesMergePolicy)
            {
                mergePolicies.Add(
                    new MergePolicy
                {
                    Name       = MergePolicyConstants.NoRequestedChangesMergePolicyName,
                    Properties = ImmutableDictionary.Create <string, JToken>()
                });
            }

            if (_options.StandardAutoMergePolicies)
            {
                mergePolicies.Add(
                    new MergePolicy
                {
                    Name       = MergePolicyConstants.StandardMergePolicyName,
                    Properties = ImmutableDictionary.Create <string, JToken>()
                });
            }

            if (_options.Batchable && mergePolicies.Count > 0)
            {
                Console.WriteLine("Batchable subscriptions cannot be combined with merge policies. " +
                                  "Merge policies are specified at a repository+branch level.");
                return(Constants.ErrorCode);
            }

            string channel          = _options.Channel;
            string sourceRepository = _options.SourceRepository;
            string targetRepository = _options.TargetRepository;
            string targetBranch     = GitHelpers.NormalizeBranchName(_options.TargetBranch);
            string updateFrequency  = _options.UpdateFrequency;
            bool   batchable        = _options.Batchable;

            // If in quiet (non-interactive mode), ensure that all options were passed, then
            // just call the remote API
            if (_options.Quiet && !_options.ReadStandardIn)
            {
                if (string.IsNullOrEmpty(channel) ||
                    string.IsNullOrEmpty(sourceRepository) ||
                    string.IsNullOrEmpty(targetRepository) ||
                    string.IsNullOrEmpty(targetBranch) ||
                    string.IsNullOrEmpty(updateFrequency) ||
                    !Constants.AvailableFrequencies.Contains(updateFrequency, StringComparer.OrdinalIgnoreCase))
                {
                    Logger.LogError($"Missing input parameters for the subscription. Please see command help or remove --quiet/-q for interactive mode");
                    return(Constants.ErrorCode);
                }
            }
            else
            {
                // Grab existing subscriptions to get suggested values.
                // TODO: When this becomes paged, set a max number of results to avoid
                // pulling too much.
                var suggestedRepos    = remote.GetSubscriptionsAsync();
                var suggestedChannels = remote.GetChannelsAsync();

                // Help the user along with a form.  We'll use the API to gather suggested values
                // from existing subscriptions based on the input parameters.
                AddSubscriptionPopUp addSubscriptionPopup =
                    new AddSubscriptionPopUp("add-subscription/add-subscription-todo",
                                             Logger,
                                             channel,
                                             sourceRepository,
                                             targetRepository,
                                             targetBranch,
                                             updateFrequency,
                                             batchable,
                                             mergePolicies,
                                             (await suggestedChannels).Select(suggestedChannel => suggestedChannel.Name),
                                             (await suggestedRepos).SelectMany(subscription => new List <string> {
                    subscription.SourceRepository, subscription.TargetRepository
                }).ToHashSet(),
                                             Constants.AvailableFrequencies,
                                             Constants.AvailableMergePolicyYamlHelp);

                UxManager uxManager = new UxManager(_options.GitLocation, Logger);
                int       exitCode  = _options.ReadStandardIn ? uxManager.ReadFromStdIn(addSubscriptionPopup) : uxManager.PopUp(addSubscriptionPopup);
                if (exitCode != Constants.SuccessCode)
                {
                    return(exitCode);
                }
                channel          = addSubscriptionPopup.Channel;
                sourceRepository = addSubscriptionPopup.SourceRepository;
                targetRepository = addSubscriptionPopup.TargetRepository;
                targetBranch     = addSubscriptionPopup.TargetBranch;
                updateFrequency  = addSubscriptionPopup.UpdateFrequency;
                mergePolicies    = addSubscriptionPopup.MergePolicies;
                batchable        = addSubscriptionPopup.Batchable;
            }

            try
            {
                // If we are about to add a batchable subscription and the merge policies are empty for the
                // target repo/branch, warn the user.
                if (batchable)
                {
                    var existingMergePolicies = await remote.GetRepositoryMergePoliciesAsync(targetRepository, targetBranch);

                    if (!existingMergePolicies.Any())
                    {
                        Console.WriteLine("Warning: Batchable subscription doesn't have any repository merge policies. " +
                                          "PRs will not be auto-merged.");
                        Console.WriteLine($"Please use 'darc set-repository-policies --repo {targetRepository} --branch {targetBranch}' " +
                                          $"to set policies.{Environment.NewLine}");
                    }
                }

                // Verify the target
                IRemote targetVerifyRemote = RemoteFactory.GetRemote(_options, targetRepository, Logger);
                if (!(await UxHelpers.VerifyAndConfirmBranchExistsAsync(targetVerifyRemote, targetRepository, targetBranch, !_options.Quiet)))
                {
                    Console.WriteLine("Aborting subscription creation.");
                    return(Constants.ErrorCode);
                }

                // Verify the source.
                IRemote sourceVerifyRemote = RemoteFactory.GetRemote(_options, sourceRepository, Logger);
                if (!(await UxHelpers.VerifyAndConfirmRepositoryExistsAsync(sourceVerifyRemote, sourceRepository, !_options.Quiet)))
                {
                    Console.WriteLine("Aborting subscription creation.");
                    return(Constants.ErrorCode);
                }

                var newSubscription = await remote.CreateSubscriptionAsync(channel,
                                                                           sourceRepository,
                                                                           targetRepository,
                                                                           targetBranch,
                                                                           updateFrequency,
                                                                           batchable,
                                                                           mergePolicies);

                Console.WriteLine($"Successfully created new subscription with id '{newSubscription.Id}'.");

                // Prompt the user to trigger the subscription unless they have explicitly disallowed it
                if (!_options.NoTriggerOnCreate)
                {
                    bool triggerAutomatically = _options.TriggerOnCreate || UxHelpers.PromptForYesNo("Trigger this subscription immediately?");
                    if (triggerAutomatically)
                    {
                        await remote.TriggerSubscriptionAsync(newSubscription.Id.ToString());

                        Console.WriteLine($"Subscription '{newSubscription.Id}' triggered.");
                    }
                }

                return(Constants.SuccessCode);
            }
            catch (AuthenticationException e)
            {
                Console.WriteLine(e.Message);
                return(Constants.ErrorCode);
            }
            catch (RestApiException e) when(e.Response.Status == (int)System.Net.HttpStatusCode.BadRequest)
            {
                // Could have been some kind of validation error (e.g. channel doesn't exist)
                Logger.LogError($"Failed to create subscription: {e.Response.Content}");
                return(Constants.ErrorCode);
            }
            catch (Exception e)
            {
                Logger.LogError(e, $"Failed to create subscription.");
                return(Constants.ErrorCode);
            }
        }
        /// <summary>
        /// Implements the 'add-subscription' operation
        /// </summary>
        /// <param name="options"></param>
        public override async Task <int> ExecuteAsync()
        {
            IRemote remote = RemoteFactory.GetBarOnlyRemote(_options, Logger);

            if (_options.IgnoreChecks.Count() > 0 && !_options.AllChecksSuccessfulMergePolicy)
            {
                Console.WriteLine($"--ignore-checks must be combined with --all-checks-passed");
                return(Constants.ErrorCode);
            }

            // Parse the merge policies
            List <MergePolicy> mergePolicies = new List <MergePolicy>();

            if (_options.NoExtraCommitsMergePolicy)
            {
                mergePolicies.Add(
                    new MergePolicy
                {
                    Name = "NoExtraCommits"
                });
            }

            if (_options.AllChecksSuccessfulMergePolicy)
            {
                mergePolicies.Add(
                    new MergePolicy
                {
                    Name       = "AllChecksSuccessful",
                    Properties = ImmutableDictionary.Create <string, JToken>()
                                 .Add("ignoreChecks", JToken.FromObject(_options.IgnoreChecks))
                });
            }

            if (_options.NoRequestedChangesMergePolicy)
            {
                mergePolicies.Add(
                    new MergePolicy
                {
                    Name       = "NoRequestedChanges",
                    Properties = ImmutableDictionary.Create <string, JToken>()
                });
            }

            if (_options.StandardAutoMergePolicies)
            {
                mergePolicies.Add(
                    new MergePolicy
                {
                    Name       = "Standard",
                    Properties = ImmutableDictionary.Create <string, JToken>()
                });
            }

            if (_options.Batchable && mergePolicies.Count > 0)
            {
                Console.WriteLine("Batchable subscriptions cannot be combined with merge policies. " +
                                  "Merge policies are specified at a repository+branch level.");
                return(Constants.ErrorCode);
            }

            string channel          = _options.Channel;
            string sourceRepository = _options.SourceRepository;
            string targetRepository = _options.TargetRepository;
            string targetBranch     = _options.TargetBranch;
            string updateFrequency  = _options.UpdateFrequency;
            bool   batchable        = _options.Batchable;

            // If in quiet (non-interactive mode), ensure that all options were passed, then
            // just call the remote API
            if (_options.Quiet)
            {
                if (string.IsNullOrEmpty(channel) ||
                    string.IsNullOrEmpty(sourceRepository) ||
                    string.IsNullOrEmpty(targetRepository) ||
                    string.IsNullOrEmpty(targetBranch) ||
                    string.IsNullOrEmpty(updateFrequency) ||
                    !Constants.AvailableFrequencies.Contains(updateFrequency, StringComparer.OrdinalIgnoreCase))
                {
                    Logger.LogError($"Missing input parameters for the subscription. Please see command help or remove --quiet/-q for interactive mode");
                    return(Constants.ErrorCode);
                }
            }
            else
            {
                // Grab existing subscriptions to get suggested values.
                // TODO: When this becomes paged, set a max number of results to avoid
                // pulling too much.
                var suggestedRepos    = remote.GetSubscriptionsAsync();
                var suggestedChannels = remote.GetChannelsAsync();

                // Help the user along with a form.  We'll use the API to gather suggested values
                // from existing subscriptions based on the input parameters.
                AddSubscriptionPopUp initEditorPopUp =
                    new AddSubscriptionPopUp("add-subscription/add-subscription-todo",
                                             Logger,
                                             channel,
                                             sourceRepository,
                                             targetRepository,
                                             targetBranch,
                                             updateFrequency,
                                             batchable,
                                             mergePolicies,
                                             (await suggestedChannels).Select(suggestedChannel => suggestedChannel.Name),
                                             (await suggestedRepos).SelectMany(subscription => new List <string> {
                    subscription.SourceRepository, subscription.TargetRepository
                }).ToHashSet(),
                                             Constants.AvailableFrequencies,
                                             Constants.AvailableMergePolicyYamlHelp);

                UxManager uxManager = new UxManager(Logger);
                int       exitCode  = uxManager.PopUp(initEditorPopUp);
                if (exitCode != Constants.SuccessCode)
                {
                    return(exitCode);
                }
                channel          = initEditorPopUp.Channel;
                sourceRepository = initEditorPopUp.SourceRepository;
                targetRepository = initEditorPopUp.TargetRepository;
                targetBranch     = initEditorPopUp.TargetBranch;
                updateFrequency  = initEditorPopUp.UpdateFrequency;
                mergePolicies    = initEditorPopUp.MergePolicies;
                batchable        = initEditorPopUp.Batchable;
            }

            try
            {
                var newSubscription = await remote.CreateSubscriptionAsync(channel,
                                                                           sourceRepository,
                                                                           targetRepository,
                                                                           targetBranch,
                                                                           updateFrequency,
                                                                           batchable,
                                                                           mergePolicies);

                Console.WriteLine($"Successfully created new subscription with id '{newSubscription.Id}'.");
                return(Constants.SuccessCode);
            }
            catch (RestApiException e) when(e.Response.StatusCode == System.Net.HttpStatusCode.BadRequest)
            {
                // Could have been some kind of validation error (e.g. channel doesn't exist)
                Logger.LogError($"Failed to create subscription: {e.Response.Content}");
                return(Constants.ErrorCode);
            }
            catch (Exception e)
            {
                Logger.LogError(e, $"Failed to create subscription.");
                return(Constants.ErrorCode);
            }
        }