public async Task UpdateLastDeployedStack()

in src/AWS.Deploy.Orchestration/LocalUserSettings/LocalUserSettingsEngine.cs [42:113]
67 lines of code
10 McCabe index (conditional complexity)

        public async Task UpdateLastDeployedStack(string stackName, string projectName, string? awsAccountId, string? awsRegion)
        {
            try
            {
                if (string.IsNullOrEmpty(projectName))
                    throw new FailedToUpdateLocalUserSettingsFileException(DeployToolErrorCode.FailedToUpdateLocalUserSettingsFile, "The Project Name is not defined.");
                if (string.IsNullOrEmpty(awsAccountId) || string.IsNullOrEmpty(awsRegion))
                    throw new FailedToUpdateLocalUserSettingsFileException(DeployToolErrorCode.FailedToUpdateLocalUserSettingsFile, "The AWS Account Id or Region is not defined.");

                var localUserSettings = await GetLocalUserSettings();
                var lastDeployedStack = localUserSettings?.LastDeployedStacks?
                    .FirstOrDefault(x => x.Exists(awsAccountId, awsRegion, projectName));

                if (localUserSettings != null)
                {
                    if (lastDeployedStack != null)
                    {
                        if (lastDeployedStack.Stacks == null)
                        {
                            lastDeployedStack.Stacks = new List<string> { stackName };
                        }
                        else
                        {
                            if (!lastDeployedStack.Stacks.Contains(stackName))
                                lastDeployedStack.Stacks.Add(stackName);
                            lastDeployedStack.Stacks.Sort();
                        }
                    }
                    else
                    {
                        var currentStack = new LastDeployedStack(
                            awsAccountId,
                            awsRegion,
                            projectName,
                            new List<string>()
                            {
                                stackName
                            });

                        if (localUserSettings.LastDeployedStacks == null)
                        {
                            localUserSettings.LastDeployedStacks = new List<LastDeployedStack>() { currentStack };
                        }
                        else
                        {
                            localUserSettings.LastDeployedStacks.Add(currentStack);
                        }
                    }
                }
                else
                {

                    var lastDeployedStacks = new List<LastDeployedStack> {
                        new LastDeployedStack(
                            awsAccountId,
                            awsRegion,
                            projectName,
                            new List<string>() { stackName }) };
                    localUserSettings = new LocalUserSettings
                    {
                        LastDeployedStacks = lastDeployedStacks
                    };
                }

                await WriteLocalUserSettingsFile(localUserSettings);
            }
            catch (Exception ex)
            {
                throw new FailedToUpdateLocalUserSettingsFileException(DeployToolErrorCode.FailedToUpdateLocalUserSettingsFile, $"Failed to update the local user settings file " +
                    $"to include the last deployed to stack '{stackName}'.", ex);
            }
        }