private void ValidateServiceClass(
            string serviceClassName,
            List <TypeParameter> typeParameters,
            List <InjectedService> injectedServices,
            string serviceClassFilePath,
            string serviceNamespace,
            string outServiceClassFilePath)
        {
            var usingDirectives = new HashSet <string>();

            var fieldDeclarations = new List <FieldDeclaration>();

            var ctorParameters = new FormalParameterList();
            var fixedParams    = ctorParameters.FixedParameters;

            var ctorBody   = new ConstructorBody();
            var statements = ctorBody.Statements;

            var appendBody = new ClassInterfaceBody()
            {
                FieldDeclarations      = fieldDeclarations,
                ConstructorDeclaration = new ConstructorDeclaration()
                {
                    FormalParameterList = ctorParameters,
                    Body = ctorBody
                }
            };

            if (injectedServices != null && injectedServices.Count > 0)
            {
                foreach (var injectedService in injectedServices)
                {
                    var injectedServiceIdentifier = injectedService.ServiceIdentifier
                                                    ?? Regex.Replace(
                        Regex.Replace(
                            injectedService.Type,
                            @"^I?([A-Z])",
                            "$1"),
                        @"^[A-Z]",
                        m => m.ToString().ToLower());

                    if (!Regex.Match(serviceNamespace, "^" + Regex.Escape(injectedService.Namespace)).Success)
                    {
                        usingDirectives.Add(injectedService.Namespace);
                    }

                    fieldDeclarations.Add(
                        new FieldDeclaration()
                    {
                        Modifiers = new List <string>()
                        {
                            Keywords.Private,
                            Keywords.Readonly
                        },
                        Type = injectedService.Type,
                        VariableDeclarator = new VariableDeclarator()
                        {
                            Identifier = "_" + injectedServiceIdentifier
                        }
                    });
                    fixedParams.Add(
                        new FixedParameter()
                    {
                        Type       = injectedService.Type,
                        Identifier = injectedServiceIdentifier
                    });
                    statements.Add(
                        new Statement()
                    {
                        SimpleAssignment = new SimpleAssignment()
                        {
                            LeftHandSide  = "_" + injectedServiceIdentifier,
                            RightHandSide = injectedServiceIdentifier
                        }
                    });
                }
            }

            var serviceClassFile = new ServiceFile()
            {
                UsingDirectives    = usingDirectives.ToList(),
                ServiceNamespace   = serviceNamespace,
                ServiceDeclaration = new ClassInterfaceDeclaration()
                {
                    IsInterface = false,
                    Modifiers   = new List <string>()
                    {
                        Keywords.Public
                    },
                    Identifier     = serviceClassName,
                    TypeParameters = typeParameters.Copy(),
                    Body           = new ClassInterfaceBody()
                    {
                        FieldDeclarations      = fieldDeclarations,
                        ConstructorDeclaration = new ConstructorDeclaration()
                        {
                            Modifiers = new List <string>()
                            {
                                Keywords.Public
                            },
                            Identifier          = serviceClassName,
                            FormalParameterList = ctorParameters,
                            Body = ctorBody
                        }
                    }
                }
            };

            if (!File.Exists(serviceClassFilePath))
            {
                //      Create <service> class file
                //      Create serviceClass StringTemplate with empty class body
                _logger.LogDebug("Creating new service class and writing it to file.");
                UpdateWrittenTo(serviceClassFilePath, outServiceClassFilePath);
                _ioUtilService.WriteStringToFile(
                    _serviceCommandStgService.RenderServiceFile(
                        usingDirectives: usingDirectives.ToList(),
                        serviceNamespace: serviceNamespace,
                        service: serviceClassFile.ServiceDeclaration),
                    outServiceClassFilePath);
            }
            else
            {
                var serviceClassParser = new CSharpParserWrapper(GetPathFromWrittenTo(serviceClassFilePath));

                var serviceClassRewrite = _serviceCommandService.InjectDataIntoServiceClass(
                    serviceClassFile,
                    serviceClassParser,
                    serviceClassName,
                    _userSettings.Value.TabString);

                if (serviceClassRewrite != null)
                {
                    _logger.LogDebug("Overwriting service class file.");
                    UpdateWrittenTo(serviceClassFilePath, outServiceClassFilePath);
                    _ioUtilService.WriteStringToFile(
                        serviceClassRewrite,
                        outServiceClassFilePath);
                }
                else
                {
                    _logger.LogDebug("Service class file was already up to date.");
                }
            }
        }
        private void ConsolidateServiceClassAndInterface(
            SourceOfTruth sourceOfTruth,
            string serviceClassName,
            string serviceInterfaceName,
            List <TypeParameter> typeParameters,
            List <InjectedService> injectedServices,
            string serviceClassFilePath,
            string serviceInterfaceFilePath,
            string serviceNamespace,
            string outServiceClassFilePath,
            string outServiceInterfaceFilePath)
        {
            var usingDirectives = new HashSet <string>();

            var fieldDeclarations = new List <FieldDeclaration>();

            var ctorParameters = new FormalParameterList();
            var fixedParams    = ctorParameters.FixedParameters;

            var ctorBody   = new ConstructorBody();
            var statements = ctorBody.Statements;

            var appendBody = new ClassInterfaceBody()
            {
                FieldDeclarations      = fieldDeclarations,
                ConstructorDeclaration = new ConstructorDeclaration()
                {
                    FormalParameterList = ctorParameters,
                    Body = ctorBody
                }
            };

            if (injectedServices != null && injectedServices.Count > 0)
            {
                foreach (var injectedService in injectedServices)
                {
                    var injectedServiceIdentifier = injectedService.ServiceIdentifier
                                                    ?? Regex.Replace(
                        Regex.Replace(
                            injectedService.Type,
                            @"^I?([A-Z])",
                            "$1"),
                        @"^[A-Z]",
                        m => m.ToString().ToLower());

                    if (!Regex.Match(serviceNamespace, "^" + Regex.Escape(injectedService.Namespace)).Success)
                    {
                        usingDirectives.Add(injectedService.Namespace);
                    }

                    fieldDeclarations.Add(
                        new FieldDeclaration()
                    {
                        Modifiers = new List <string>()
                        {
                            Keywords.Private,
                            Keywords.Readonly
                        },
                        Type = injectedService.Type,
                        VariableDeclarator = new VariableDeclarator()
                        {
                            Identifier = "_" + injectedServiceIdentifier
                        }
                    });
                    fixedParams.Add(
                        new FixedParameter()
                    {
                        Type       = injectedService.Type,
                        Identifier = injectedServiceIdentifier
                    });
                    statements.Add(
                        new Statement()
                    {
                        SimpleAssignment = new SimpleAssignment()
                        {
                            LeftHandSide  = "_" + injectedServiceIdentifier,
                            RightHandSide = injectedServiceIdentifier
                        }
                    });
                }
            }

            CSharpParserWrapper serviceClassParser     = null;
            CSharpParserWrapper serviceInterfaceParser = null;

            ServiceFile classScraperResults     = null;
            ServiceFile interfaceScraperResults = null;

            //Check if <service> class file exists:
            if (File.Exists(serviceClassFilePath))
            {
                _logger.LogDebug("Service class file found. Pulling data from service class.");
                //  Else:
                //      Parse <service> class file
                //          Extract list of existing public method signatures

                serviceClassParser = new CSharpParserWrapper(GetPathFromWrittenTo(serviceClassFilePath));

                classScraperResults = _serviceCommandService.ScrapeServiceClass(
                    serviceClassParser,
                    serviceClassName,
                    serviceNamespace,
                    typeParameters);
            }
            else
            {
                _logger.LogDebug($"No service class file found at {serviceClassFilePath}.");
            }

            //Check if <service> interface file exists:
            if (File.Exists(serviceInterfaceFilePath))
            {
                _logger.LogDebug("Service interface file found. Pulling data from service interface.");
                //  Else:
                //      Parse <service> interface file
                //          Extract list of existing method signatures

                serviceInterfaceParser = new CSharpParserWrapper(GetPathFromWrittenTo(serviceInterfaceFilePath));

                interfaceScraperResults = _serviceCommandService.ScrapeServiceInterface(
                    serviceInterfaceParser,
                    serviceInterfaceName,
                    serviceNamespace,
                    typeParameters);
            }
            else
            {
                _logger.LogDebug($"No service interface file found at {serviceInterfaceFilePath}.");
            }

            if (classScraperResults is null && interfaceScraperResults is null)
            {
                _logger.LogDebug("Creating new service class and interface and writing them to file.");

                //      Create <service> class file
                //      Create serviceClass StringTemplate with empty class body
                var classDeclaration = new ClassInterfaceDeclaration()
                {
                    IsInterface = false,
                    Modifiers   = new List <string>()
                    {
                        Keywords.Public
                    },
                    Identifier     = serviceClassName,
                    TypeParameters = typeParameters.Copy(),
                    Base           = new ClassInterfaceBase()
                    {
                        InterfaceTypeList = new List <string>()
                        {
                            serviceInterfaceName + _cSharpCommonStgService.RenderTypeParamList(typeParameters.Copy())
                        }
                    },
                    Body = new ClassInterfaceBody()
                    {
                        FieldDeclarations      = fieldDeclarations,
                        ConstructorDeclaration = new ConstructorDeclaration()
                        {
                            Modifiers = new List <string>()
                            {
                                Keywords.Public
                            },
                            Identifier          = serviceClassName,
                            FormalParameterList = ctorParameters,
                            Body = ctorBody
                        }
                    }
                };
                UpdateWrittenTo(serviceClassFilePath, outServiceClassFilePath);
                _ioUtilService.WriteStringToFile(
                    _serviceCommandStgService.RenderServiceFile(
                        usingDirectives: usingDirectives.ToList(),
                        serviceNamespace: serviceNamespace,
                        service: classDeclaration),
                    outServiceClassFilePath);

                //      Create <service> interface file
                //      Create serviceInterface StringTemplate with empty interface body
                var interfaceDeclaration = new ClassInterfaceDeclaration()
                {
                    IsInterface = true,
                    Modifiers   = new List <string>()
                    {
                        Keywords.Public
                    },
                    Identifier     = serviceInterfaceName,
                    TypeParameters = typeParameters.Copy()
                };

                UpdateWrittenTo(serviceInterfaceFilePath, outServiceInterfaceFilePath);
                _ioUtilService.WriteStringToFile(
                    _serviceCommandStgService.RenderServiceFile(
                        serviceNamespace: serviceNamespace,
                        service: interfaceDeclaration),
                    outServiceInterfaceFilePath);
            }
        public Task Execute(BreadcrumbCommand breadcrumbCommand)
        {
            var areaRootNamespace = _projectEnvironment.Value.RootNamespace +
                                    (breadcrumbCommand.Area is null || breadcrumbCommand.Area.TrimEnd(@"/\ ".ToCharArray()) == string.Empty
                    ? string.Empty : $".Areas.{breadcrumbCommand.Area.TrimEnd(@"/\ ".ToCharArray())}");

            var controllerRootNamespace = areaRootNamespace + ".Controllers";

            var breadcrumbRootNamespace = areaRootNamespace + "." +
                                          (breadcrumbCommand?.BreadcrumbServiceDirectory?.TrimEnd(@"/\ ".ToCharArray()) ?? "Services.Breadcrumbs"
                                          ).Replace("/", ".").Replace(@"\", ".");

            var defaultAreaBreadcrumbServiceRootName = _projectEnvironment.Value.RootNamespace +
                                                       (breadcrumbCommand.Area is null || breadcrumbCommand.Area.TrimEnd(@"/\ ".ToCharArray()) == string.Empty
                    ? string.Empty
                    : breadcrumbCommand.Area.TrimEnd(@"/\ ".ToCharArray())) +
                                                       "Breadcrumb";

            var defaultAreaBreadcrumbServiceName = defaultAreaBreadcrumbServiceRootName + "Service";

            var commandRootDirectory = Path.Combine(
                _projectEnvironment.Value.RootDirectory,
                (breadcrumbCommand.Area is null || breadcrumbCommand.Area.TrimEnd(@"/\ ".ToCharArray()) == string.Empty
                    ? string.Empty : Path.Combine("Areas", breadcrumbCommand.Area)));

            var targetDirectory = Path.Combine(
                commandRootDirectory, breadcrumbCommand.TargetDirectory ?? "Controllers");

            var breadcrumbOutputDirectory = Path.Combine(
                commandRootDirectory, breadcrumbCommand?.BreadcrumbServiceDirectory ?? "Services/Breadcrumbs");

            Directory.CreateDirectory(breadcrumbOutputDirectory);

            if (!Directory.Exists(targetDirectory))
            {
                _logger.LogError($"TargetDirectory does not exist at {targetDirectory}");
                // throw
                return(Task.CompletedTask);
            }

            var filenames = new List <string>();

            if (breadcrumbCommand.TargetFile != null)
            {
                var targetFile = Path.Combine(targetDirectory, breadcrumbCommand.TargetFile);
                if (!File.Exists(targetFile))
                {
                    _logger.LogError($"TargetFile does not exist at {targetFile}");
                    // throw
                    return(Task.CompletedTask);
                }
                filenames.Add(targetFile);
                _logger.LogDebug("Service interface file was already up to date.");
            }
            else
            {
                filenames = GetCSharpFilesInDirectory(targetDirectory, breadcrumbCommand.IsRecursive ?? false);
            }

            var controllerDict = new ControllerDictionary();

            foreach (var filename in filenames)
            {
                var controllerParser = new CSharpParserWrapper(GetPathFromWrittenTo(filename));
                var tree             = controllerParser.GetParseTree();

                var visitor = _breadcrumbControllerScraperFactory.Create(
                    controllerParser.Tokens);
                visitor.Visit(tree);
                var scraperResults = visitor.Results;

                foreach (var nameKey in scraperResults.NamespaceDict.Keys)
                {
                    if (controllerDict.NamespaceDict.ContainsKey(nameKey))
                    {
                        foreach (var classKey in scraperResults.NamespaceDict[nameKey].ClassDict.Keys)
                        {
                            controllerDict.NamespaceDict[nameKey].ClassDict[classKey] =
                                scraperResults.NamespaceDict[nameKey].ClassDict[classKey];
                        }
                    }
                    else
                    {
                        controllerDict.NamespaceDict[nameKey] = scraperResults.NamespaceDict[nameKey];
                    }
                }
            }

            //public class InjectedService
            //{
            //    public string Type { get; set; }
            //    public string ServiceIdentifier { get; set; }
            //    public string Namespace { get; set; }
            //}
            var usingDirectives = new HashSet <string>()
            {
                "SmartBreadcrumbs.Nodes"
            };

            var fieldDeclarations = new List <FieldDeclaration>();

            var ctorParameters = new FormalParameterList();
            var fixedParams    = ctorParameters.FixedParameters;

            var ctorBody   = new ConstructorBody();
            var statements = ctorBody.Statements;

            foreach (var injectedService in breadcrumbCommand.InjectedServices)
            {
                var injectedServiceIdentifier = injectedService.ServiceIdentifier
                                                ?? Regex.Replace(
                    Regex.Replace(
                        injectedService.Type,
                        @"^I?([A-Z])",
                        "$1"),
                    @"^[A-Z]",
                    m => m.ToString().ToLower());

                if (!Regex.Match(breadcrumbRootNamespace, "^" + Regex.Escape(injectedService.Namespace)).Success)
                {
                    usingDirectives.Add(injectedService.Namespace);
                }

                fieldDeclarations.Add(
                    new FieldDeclaration()
                {
                    Modifiers = new List <string>()
                    {
                        Keywords.Private,
                        Keywords.Readonly
                    },
                    Type = injectedService.Type,
                    VariableDeclarator = new VariableDeclarator()
                    {
                        Identifier = "_" + injectedServiceIdentifier
                    }
                });
                fixedParams.Add(
                    new FixedParameter()
                {
                    Type       = injectedService.Type,
                    Identifier = injectedServiceIdentifier
                });
                statements.Add(
                    new Statement()
                {
                    SimpleAssignment = new SimpleAssignment()
                    {
                        LeftHandSide  = "_" + injectedServiceIdentifier,
                        RightHandSide = injectedServiceIdentifier
                    }
                });
            }

            var startupRegInfoList = new List <StartupRegistrationInfo>();

            foreach (var controllerNamespace in controllerDict.NamespaceDict.Values)
            {
                var namespaceSuffix = Regex.Replace(
                    controllerNamespace.Namespace, "^" + Regex.Escape(controllerRootNamespace + "."), string.Empty);

                var serviceNamePrefix = namespaceSuffix.Replace(".", "");

                var serviceClassName = serviceNamePrefix == string.Empty
                    ? defaultAreaBreadcrumbServiceRootName
                    : serviceNamePrefix + "BreadcrumbService";

                var serviceInterfaceName = $"I{serviceClassName}";

                var serviceClassFilename        = Path.Combine(breadcrumbOutputDirectory, $"{serviceClassName}.cs");
                var serviceInterfaceFilename    = Path.Combine(breadcrumbOutputDirectory, $"{serviceInterfaceName}.cs");
                var outServiceClassFilename     = Path.Combine(breadcrumbOutputDirectory, $"X{serviceClassName}.cs");
                var outServiceInterfaceFilename = Path.Combine(breadcrumbOutputDirectory, $"X{serviceInterfaceName}.cs");

                startupRegInfoList.Add(new StartupRegistrationInfo()
                {
                    ServiceNamespace  = breadcrumbRootNamespace,
                    ServiceClassType  = serviceClassName,
                    ServiceBaseType   = serviceInterfaceName,
                    HasTypeParameters = false,
                    ServiceLifespan   = ServiceLifetime.Scoped
                });

                var classDeclaration = new BreadcrumbServiceDeclaration()
                {
                    IsInterface = false,
                    Modifiers   = new List <string>()
                    {
                        Keywords.Public
                    },
                    Identifier = serviceClassName,
                    Base       = new ClassInterfaceBase()
                    {
                        InterfaceTypeList = new List <string>()
                        {
                            serviceInterfaceName
                        }
                    },
                    Body = new BreadcrumbServiceBody()
                    {
                        FieldDeclarations      = fieldDeclarations,
                        ConstructorDeclaration = new ConstructorDeclaration()
                        {
                            Modifiers = new List <string>()
                            {
                                Keywords.Public
                            },
                            Identifier          = serviceClassName,
                            FormalParameterList = ctorParameters,
                            Body = ctorBody
                        }
                    }
                };

                var interfaceDeclaration = new BreadcrumbServiceDeclaration()
                {
                    IsInterface = true,
                    Identifier  = serviceInterfaceName
                };

                foreach (var controllerClass in controllerNamespace.ClassDict.Values)
                {
                    var controllerNamePattern = breadcrumbCommand.ControllerNamePattern?.Replace(
                        "$ControllerType$", controllerClass.Controller)
                                                ?? $"\"{Regex.Replace(controllerClass.Controller, "Controller$", string.Empty)}\"";

                    foreach (var controllerAction in controllerClass.ActionDict.Values)
                    {
                        var methodDeclaration = new BreadcrumbMethodDeclaration()
                        {
                            ControllerRoot        = controllerClass.ControllerRoot,
                            Action                = controllerAction.Action,
                            HasId                 = controllerAction.HasId,
                            Controller            = controllerClass.Controller,
                            ControllerNamePattern = controllerNamePattern
                        };

                        classDeclaration.Body.MethodDeclarations.Add(methodDeclaration);
                        interfaceDeclaration.Body.MethodDeclarations.Add(methodDeclaration);
                    }
                }

                if (!File.Exists(serviceClassFilename))
                {
                    var cos = _breadcrumbCommandStgService.RenderBreadcrumbServiceFile(
                        usingDirectives.ToList(),
                        breadcrumbRootNamespace,
                        classDeclaration);

                    _ioUtilService.WriteStringToFile(
                        cos,
                        outServiceClassFilename);
                    UpdateWrittenTo(serviceClassFilename, outServiceClassFilename);

                    var ios = _breadcrumbCommandStgService.RenderBreadcrumbServiceFile(
                        usingDirectives.ToList(),
                        breadcrumbRootNamespace,
                        interfaceDeclaration);

                    _ioUtilService.WriteStringToFile(
                        ios,
                        outServiceInterfaceFilename);
                    UpdateWrittenTo(serviceInterfaceFilename, outServiceInterfaceFilename);
                }
                else
                {
                    var breadcrumbClassParser = new CSharpParserWrapper(
                        GetPathFromWrittenTo(
                            Path.Combine(breadcrumbOutputDirectory, serviceClassFilename)));
                    var tree = breadcrumbClassParser.GetParseTree();

                    var visitor = _breadcrumbClassInjectorFactory.Create(
                        breadcrumbClassParser.Tokens,
                        usingDirectives.ToList(),
                        breadcrumbRootNamespace,
                        classDeclaration,
                        _userSettings.Value.TabString);
                    visitor.Visit(tree);

                    if (visitor.IsModified)
                    {
                        _ioUtilService.WriteStringToFile(
                            visitor.Rewriter.GetText(),
                            outServiceClassFilename);
                        UpdateWrittenTo(serviceClassFilename, outServiceClassFilename);
                    }

                    var serviceClassParser = new CSharpParserWrapper(GetPathFromWrittenTo(serviceClassFilename));

                    var classScraperResults = _serviceCommandService.ScrapeServiceClass(
                        serviceClassParser,
                        serviceClassName,
                        breadcrumbRootNamespace,
                        null);

                    _ioUtilService.WriteStringToFile(
                        _serviceCommandService.GetInterfaceServiceFileFromClass(
                            classScraperResults,
                            serviceInterfaceName,
                            breadcrumbRootNamespace),
                        outServiceInterfaceFilename);
                    UpdateWrittenTo(serviceInterfaceFilename, outServiceInterfaceFilename);
                }
            }

            RegisterServicesInStartup(startupRegInfoList);

            InjectBreadcrumbsIntoControllers(controllerFilepaths: filenames,
                                             controllerDictionary: controllerDict,
                                             breadcrumbServiceNamespace: breadcrumbRootNamespace,
                                             controllerRootNamespace: controllerRootNamespace,
                                             defaultAreaBreadcrumbServiceRootName: defaultAreaBreadcrumbServiceRootName,
                                             tabString: _userSettings.Value.TabString);

            return(Task.CompletedTask);
        }