using System.Net;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Options;
using Umbraco.Cms.Core;
using Umbraco.Cms.Core.Configuration.Models;
using Umbraco.Cms.Core.Hosting;
using Umbraco.Cms.Core.IO;
using Umbraco.Cms.Core.Mapping;
using Umbraco.Cms.Core.Models;
using Umbraco.Cms.Core.Models.ContentEditing;
using Umbraco.Cms.Core.Security;
using Umbraco.Cms.Core.Services;
using Umbraco.Cms.Core.Snippets;
using Umbraco.Cms.Core.Strings;
using Umbraco.Cms.Core.Strings.Css;
using Umbraco.Cms.Web.BackOffice.Filters;
using Umbraco.Cms.Web.BackOffice.Trees;
using Umbraco.Cms.Web.Common.ActionsResults;
using Umbraco.Cms.Web.Common.Attributes;
using Umbraco.Cms.Web.Common.Authorization;
using Umbraco.Cms.Web.Common.DependencyInjection;
using Umbraco.Extensions;
using Constants = Umbraco.Cms.Core.Constants;
using Stylesheet = Umbraco.Cms.Core.Models.Stylesheet;
using StylesheetRule = Umbraco.Cms.Core.Models.ContentEditing.StylesheetRule;

namespace Umbraco.Cms.Web.BackOffice.Controllers
{
    // TODO: Put some exception filters in our webapi to return 404 instead of 500 when we throw ArgumentNullException
    // ref: https://www.exceptionnotfound.net/the-asp-net-web-api-exception-handling-pipeline-a-guided-tour/
    [PluginController(Constants.Web.Mvc.BackOfficeApiArea)]
    //[PrefixlessBodyModelValidator]
    [Authorize(Policy = AuthorizationPolicies.SectionAccessSettings)]
    public class CodeFileController : BackOfficeNotificationsController
    {
        private readonly IHostingEnvironment _hostingEnvironment;
        private readonly FileSystems _fileSystems;
        private readonly IFileService _fileService;
        private readonly IBackOfficeSecurityAccessor _backOfficeSecurityAccessor;

        private readonly ILocalizedTextService _localizedTextService;
        private readonly IUmbracoMapper _umbracoMapper;
        private readonly IShortStringHelper _shortStringHelper;
        private readonly GlobalSettings _globalSettings;
        private readonly PartialViewSnippetCollection _partialViewSnippetCollection;
        private readonly PartialViewMacroSnippetCollection _partialViewMacroSnippetCollection;

        [ActivatorUtilitiesConstructor]
        public CodeFileController(
            IHostingEnvironment hostingEnvironment,
            FileSystems fileSystems,
            IFileService fileService,
            IBackOfficeSecurityAccessor backOfficeSecurityAccessor,
            ILocalizedTextService localizedTextService,
            IUmbracoMapper umbracoMapper,
            IShortStringHelper shortStringHelper,
            IOptionsSnapshot<GlobalSettings> globalSettings,
            PartialViewSnippetCollection partialViewSnippetCollection,
            PartialViewMacroSnippetCollection partialViewMacroSnippetCollection)
        {
            _hostingEnvironment = hostingEnvironment;
            _fileSystems = fileSystems;
            _fileService = fileService;
            _backOfficeSecurityAccessor = backOfficeSecurityAccessor;
            _localizedTextService = localizedTextService;
            _umbracoMapper = umbracoMapper;
            _shortStringHelper = shortStringHelper;
            _globalSettings = globalSettings.Value;
            _partialViewSnippetCollection = partialViewSnippetCollection;
            _partialViewMacroSnippetCollection = partialViewMacroSnippetCollection;
        }

        [Obsolete("Use ctor will all params. Scheduled for removal in V12.")]
        public CodeFileController(
            IHostingEnvironment hostingEnvironment,
            FileSystems fileSystems,
            IFileService fileService,
            IBackOfficeSecurityAccessor backOfficeSecurityAccessor,
            ILocalizedTextService localizedTextService,
            IUmbracoMapper umbracoMapper,
            IShortStringHelper shortStringHelper,
            IOptionsSnapshot<GlobalSettings> globalSettings) : this(
                hostingEnvironment,
                fileSystems,
                fileService,
                backOfficeSecurityAccessor,
                localizedTextService,
                umbracoMapper,
                shortStringHelper,
                globalSettings,
                StaticServiceProvider.Instance.GetRequiredService<PartialViewSnippetCollection>(),
                StaticServiceProvider.Instance.GetRequiredService<PartialViewMacroSnippetCollection>())
        {
        }

        /// <summary>
        /// Used to create a brand new file
        /// </summary>
        /// <param name="type">This is a string but will be 'scripts' 'partialViews', 'partialViewMacros'</param>
        /// <param name="display"></param>
        /// <returns>Will return a simple 200 if file creation succeeds</returns>
        [ValidationFilter]
        public ActionResult<CodeFileDisplay> PostCreate(string type, CodeFileDisplay display)
        {
            if (display == null) throw new ArgumentNullException("display");
            if (string.IsNullOrWhiteSpace(type)) throw new ArgumentException("Value cannot be null or whitespace.", "type");

            var currentUser = _backOfficeSecurityAccessor.BackOfficeSecurity?.CurrentUser;
            switch (type)
            {
                case Constants.Trees.PartialViews:
                    var view = new PartialView(PartialViewType.PartialView, display.VirtualPath ?? string.Empty);
                    view.Content = display.Content;
                    var result = _fileService.CreatePartialView(view, display.Snippet, currentUser?.Id);
                    if (result.Success)
                    {
                        return Ok();
                    }
                    else
                    {
                        return ValidationProblem(result.Exception?.Message);
                    }

                case Constants.Trees.PartialViewMacros:
                    var viewMacro = new PartialView(PartialViewType.PartialViewMacro, display.VirtualPath ?? string.Empty);
                    viewMacro.Content = display.Content;
                    var resultMacro = _fileService.CreatePartialViewMacro(viewMacro, display.Snippet, currentUser?.Id);
                    if (resultMacro.Success)
                        return Ok();
                    else
                        return ValidationProblem(resultMacro.Exception?.Message);

                case Constants.Trees.Scripts:
                    var script = new Script(display.VirtualPath ?? string.Empty);
                    _fileService.SaveScript(script, currentUser?.Id);
                    return Ok();

                default:
                    return NotFound();
            }
        }

        /// <summary>
        /// Used to create a container/folder in 'partialViews', 'partialViewMacros', 'scripts' or 'stylesheets'
        /// </summary>
        /// <param name="type">'partialViews', 'partialViewMacros' or 'scripts'</param>
        /// <param name="parentId">The virtual path of the parent.</param>
        /// <param name="name">The name of the container/folder</param>
        /// <returns></returns>
        [HttpPost]
        public ActionResult<CodeFileDisplay> PostCreateContainer(string type, string parentId, string name)
        {
            if (string.IsNullOrWhiteSpace(type)) throw new ArgumentException("Value cannot be null or whitespace.", "type");
            if (string.IsNullOrWhiteSpace(parentId)) throw new ArgumentException("Value cannot be null or whitespace.", "parentId");
            if (string.IsNullOrWhiteSpace(name)) throw new ArgumentException("Value cannot be null or whitespace.", "name");
            if (name.ContainsAny(Path.GetInvalidPathChars())) {
                return ValidationProblem(_localizedTextService.Localize("codefile", "createFolderIllegalChars"));
            }

            // if the parentId is root (-1) then we just need an empty string as we are
            // creating the path below and we don't want -1 in the path
            if (parentId == Constants.System.RootString)
            {
                parentId = string.Empty;
            }

            name = System.Web.HttpUtility.UrlDecode(name);

            if (parentId.IsNullOrWhiteSpace() == false)
            {
                parentId = System.Web.HttpUtility.UrlDecode(parentId);
                name = parentId.EnsureEndsWith("/") + name;
            }

            var virtualPath = string.Empty;
            switch (type)
            {
                case Constants.Trees.PartialViews:
                    virtualPath = NormalizeVirtualPath(name, Constants.SystemDirectories.PartialViews);
                    _fileService.CreatePartialViewFolder(virtualPath);
                    break;
                case Constants.Trees.PartialViewMacros:
                    virtualPath = NormalizeVirtualPath(name, Constants.SystemDirectories.MacroPartials);
                    _fileService.CreatePartialViewMacroFolder(virtualPath);
                    break;
                case Constants.Trees.Scripts:
                    virtualPath = NormalizeVirtualPath(name, _globalSettings.UmbracoScriptsPath);
                    _fileService.CreateScriptFolder(virtualPath);
                    break;
                case Constants.Trees.Stylesheets:
                    virtualPath = NormalizeVirtualPath(name, _globalSettings.UmbracoCssPath);
                    _fileService.CreateStyleSheetFolder(virtualPath);
                    break;

            }

            return new CodeFileDisplay
            {
                VirtualPath = virtualPath,
                Path = Url.GetTreePathFromFilePath(virtualPath)
            };
        }

        /// <summary>
        /// Used to get a specific file from disk via the FileService
        /// </summary>
        /// <param name="type">This is a string but will be 'scripts' 'partialViews', 'partialViewMacros' or 'stylesheets'</param>
        /// <param name="virtualPath">The filename or URL encoded path of the file to open</param>
        /// <returns>The file and its contents from the virtualPath</returns>
        public ActionResult<CodeFileDisplay?> GetByPath(string type, string virtualPath)
        {
            if (string.IsNullOrWhiteSpace(type)) throw new ArgumentException("Value cannot be null or whitespace.", "type");
            if (string.IsNullOrWhiteSpace(virtualPath)) throw new ArgumentException("Value cannot be null or whitespace.", "virtualPath");

            virtualPath = System.Web.HttpUtility.UrlDecode(virtualPath);

            switch (type)
            {
                case Constants.Trees.PartialViews:
                    var view = _fileService.GetPartialView(virtualPath);
                    if (view != null)
                    {
                        var display = _umbracoMapper.Map<IPartialView, CodeFileDisplay>(view);

                        if (display is not null)
                        {
                            display.FileType = Constants.Trees.PartialViews;
                            display.Path = Url.GetTreePathFromFilePath(view.Path);
                            display.Id = System.Web.HttpUtility.UrlEncode(view.Path);
                        }

                        return display;
                    }

                    break;
                case Constants.Trees.PartialViewMacros:
                    var viewMacro = _fileService.GetPartialViewMacro(virtualPath);
                    if (viewMacro != null)
                    {
                        var display = _umbracoMapper.Map<IPartialView, CodeFileDisplay>(viewMacro);

                        if (display is not null)
                        {
                            display.FileType = Constants.Trees.PartialViewMacros;
                            display.Path = Url.GetTreePathFromFilePath(viewMacro.Path);
                            display.Id = System.Web.HttpUtility.UrlEncode(viewMacro.Path);
                        }

                        return display;
                    }
                    break;
                case Constants.Trees.Scripts:
                    var script = _fileService.GetScript(virtualPath);
                    if (script != null)
                    {
                        var display = _umbracoMapper.Map<IScript, CodeFileDisplay>(script);

                        if (display is not null)
                        {
                            display.FileType = Constants.Trees.Scripts;
                            display.Path = Url.GetTreePathFromFilePath(script.Path);
                            display.Id = System.Web.HttpUtility.UrlEncode(script.Path);
                        }

                        return display;
                    }
                    break;
                case Constants.Trees.Stylesheets:
                    var stylesheet = _fileService.GetStylesheet(virtualPath);
                    if (stylesheet != null)
                    {
                        var display = _umbracoMapper.Map<IStylesheet, CodeFileDisplay>(stylesheet);

                        if (display is not null)
                        {
                            display.FileType = Constants.Trees.Stylesheets;
                            display.Path = Url.GetTreePathFromFilePath(stylesheet.Path);
                            display.Id = System.Web.HttpUtility.UrlEncode(stylesheet.Path);
                        }

                        return display;
                    }
                    break;
            }

            return NotFound();
        }

        /// <summary>
        /// Used to get a list of available templates/snippets to base a new Partial View or Partial View Macro from
        /// </summary>
        /// <param name="type">This is a string but will be 'partialViews', 'partialViewMacros'</param>
        /// <returns>Returns a list of <see cref="SnippetDisplay"/> if a correct type is sent</returns>
        public ActionResult<IEnumerable<SnippetDisplay>> GetSnippets(string type)
        {
            if (string.IsNullOrWhiteSpace(type)) throw new ArgumentException("Value cannot be null or whitespace.", "type");

            IEnumerable<string> snippets;
            switch (type)
            {
                case Constants.Trees.PartialViews:
                    snippets = _partialViewSnippetCollection.GetNames();
                    break;
                case Constants.Trees.PartialViewMacros:
                    snippets = _partialViewMacroSnippetCollection.GetNames();
                    break;
                default:
                    return NotFound();
            }

            return snippets.Select(snippet => new SnippetDisplay() { Name = snippet.SplitPascalCasing(_shortStringHelper).ToFirstUpperInvariant(), FileName = snippet }).ToList();
        }

        /// <summary>
        /// Used to scaffold the json object for the editors for 'scripts', 'partialViews', 'partialViewMacros' and 'stylesheets'
        /// </summary>
        /// <param name="type">This is a string but will be 'scripts' 'partialViews', 'partialViewMacros' or 'stylesheets'</param>
        /// <param name="id"></param>
        /// <param name="snippetName"></param>
        /// <returns></returns>
        public ActionResult<CodeFileDisplay?> GetScaffold(string type, string id, string? snippetName = null)
        {
            if (string.IsNullOrWhiteSpace(type)) throw new ArgumentException("Value cannot be null or whitespace.", "type");
            if (string.IsNullOrWhiteSpace(id)) throw new ArgumentException("Value cannot be null or whitespace.", "id");

            CodeFileDisplay? codeFileDisplay;

            switch (type)
            {
                case Constants.Trees.PartialViews:
                    codeFileDisplay = _umbracoMapper.Map<IPartialView, CodeFileDisplay>(new PartialView(PartialViewType.PartialView, string.Empty));
                    if (codeFileDisplay is not null)
                    {
                        codeFileDisplay.VirtualPath = Constants.SystemDirectories.PartialViews;
                        if (snippetName.IsNullOrWhiteSpace() == false)
                        {
                            codeFileDisplay.Content = _partialViewSnippetCollection.GetContentFromName(snippetName!);
                        }
                    }

                    break;
                case Constants.Trees.PartialViewMacros:
                    codeFileDisplay = _umbracoMapper.Map<IPartialView, CodeFileDisplay>(new PartialView(PartialViewType.PartialViewMacro, string.Empty));
                    if (codeFileDisplay is not null)
                    {
                        codeFileDisplay.VirtualPath = Constants.SystemDirectories.MacroPartials;
                        if (snippetName.IsNullOrWhiteSpace() == false)
                        {
                            codeFileDisplay.Content = _partialViewMacroSnippetCollection.GetContentFromName(snippetName!);
                        }
                    }

                    break;
                case Constants.Trees.Scripts:
                    codeFileDisplay = _umbracoMapper.Map<Script, CodeFileDisplay>(new Script(string.Empty));
                    if (codeFileDisplay is not null)
                    {
                        codeFileDisplay.VirtualPath = _globalSettings.UmbracoScriptsPath;
                    }

                    break;
                case Constants.Trees.Stylesheets:
                    codeFileDisplay = _umbracoMapper.Map<Stylesheet, CodeFileDisplay>(new Stylesheet(string.Empty));
                    if (codeFileDisplay is not null)
                    {
                        codeFileDisplay.VirtualPath = _globalSettings.UmbracoCssPath;
                    }

                    break;
                default:
                    return new UmbracoProblemResult("Unsupported editortype", HttpStatusCode.BadRequest);
            }

            if (codeFileDisplay is null)
            {
                return codeFileDisplay;
            }
            // Make sure that the root virtual path ends with '/'
            codeFileDisplay.VirtualPath = codeFileDisplay.VirtualPath?.EnsureEndsWith("/");

            if (id != Constants.System.RootString)
            {
                codeFileDisplay.VirtualPath += id.TrimStart(Constants.CharArrays.ForwardSlash).EnsureEndsWith("/");
                //if it's not new then it will have a path, otherwise it won't
                codeFileDisplay.Path = Url.GetTreePathFromFilePath(id);
            }

            codeFileDisplay.VirtualPath = codeFileDisplay.VirtualPath?.TrimStart("~");
            codeFileDisplay.FileType = type;
            return codeFileDisplay;
        }

        /// <summary>
        /// Used to delete a specific file from disk via the FileService
        /// </summary>
        /// <param name="type">This is a string but will be 'scripts' 'partialViews', 'partialViewMacros' or 'stylesheets'</param>
        /// <param name="virtualPath">The filename or URL encoded path of the file to delete</param>
        /// <returns>Will return a simple 200 if file deletion succeeds</returns>
        [HttpDelete]
        [HttpPost]
        public IActionResult Delete(string type, string virtualPath)
        {
            if (string.IsNullOrWhiteSpace(type)) throw new ArgumentException("Value cannot be null or whitespace.", "type");
            if (string.IsNullOrWhiteSpace(virtualPath)) throw new ArgumentException("Value cannot be null or whitespace.", "virtualPath");

            virtualPath = System.Web.HttpUtility.UrlDecode(virtualPath);
            var currentUser = _backOfficeSecurityAccessor.BackOfficeSecurity?.CurrentUser;
            switch (type)
            {
                case Constants.Trees.PartialViews:
                    if (IsDirectory(_hostingEnvironment.MapPathContentRoot(Path.Combine(Constants.SystemDirectories.PartialViews, virtualPath))))
                    {
                        _fileService.DeletePartialViewFolder(virtualPath);
                        return Ok();
                    }
                    if (_fileService.DeletePartialView(virtualPath, currentUser?.Id))
                    {
                        return Ok();
                    }
                    return new UmbracoProblemResult("No Partial View or folder found with the specified path", HttpStatusCode.NotFound);

                case Constants.Trees.PartialViewMacros:
                    if (IsDirectory(_hostingEnvironment.MapPathContentRoot(Path.Combine(Constants.SystemDirectories.MacroPartials, virtualPath))))
                    {
                        _fileService.DeletePartialViewMacroFolder(virtualPath);
                        return Ok();
                    }
                    if (_fileService.DeletePartialViewMacro(virtualPath, currentUser?.Id))
                    {
                        return Ok();
                    }
                    return new UmbracoProblemResult("No Partial View Macro or folder found with the specified path", HttpStatusCode.NotFound);

                case Constants.Trees.Scripts:
                    if (IsDirectory(_hostingEnvironment.MapPathWebRoot(Path.Combine(_globalSettings.UmbracoScriptsPath, virtualPath))))
                    {
                        _fileService.DeleteScriptFolder(virtualPath);
                        return Ok();
                    }
                    if (_fileService.GetScript(virtualPath) != null)
                    {
                        _fileService.DeleteScript(virtualPath, currentUser?.Id);
                        return Ok();
                    }
                    return new UmbracoProblemResult("No Script or folder found with the specified path", HttpStatusCode.NotFound);
                case Constants.Trees.Stylesheets:
                    if (IsDirectory(_hostingEnvironment.MapPathWebRoot(Path.Combine(_globalSettings.UmbracoCssPath, virtualPath))))
                    {
                        _fileService.DeleteStyleSheetFolder(virtualPath);
                        return Ok();
                    }
                    if (_fileService.GetStylesheet(virtualPath) != null)
                    {
                        _fileService.DeleteStylesheet(virtualPath, currentUser?.Id);
                        return Ok();
                    }
                    return new UmbracoProblemResult("No Stylesheet found with the specified path", HttpStatusCode.NotFound);
                default:
                    return NotFound();
            }
        }

        /// <summary>
        /// Used to create or update a 'partialview', 'partialviewmacro', 'script' or 'stylesheets' file
        /// </summary>
        /// <param name="display"></param>
        /// <returns>The updated CodeFileDisplay model</returns>
        public ActionResult<CodeFileDisplay> PostSave(CodeFileDisplay display)
        {
            if (display == null) throw new ArgumentNullException("display");

            TryValidateModel(display);
            if (ModelState.IsValid == false)
            {
                return ValidationProblem(ModelState);
            }

            switch (display.FileType)
            {
                case Constants.Trees.PartialViews:
                    var partialViewResult = CreateOrUpdatePartialView(display);
                    if (partialViewResult.Success)
                    {
                        display = _umbracoMapper.Map(partialViewResult.Result, display);
                        display.Path = Url.GetTreePathFromFilePath(partialViewResult.Result?.Path);
                        display.Id = System.Web.HttpUtility.UrlEncode(partialViewResult.Result?.Path);
                        return display;
                    }

                    display.AddErrorNotification(
                        _localizedTextService.Localize("speechBubbles", "partialViewErrorHeader"),
                        _localizedTextService.Localize("speechBubbles", "partialViewErrorText"));
                    break;

                case Constants.Trees.PartialViewMacros:
                    var partialViewMacroResult = CreateOrUpdatePartialViewMacro(display);
                    if (partialViewMacroResult.Success)
                    {
                        display = _umbracoMapper.Map(partialViewMacroResult.Result, display);
                        display.Path = Url.GetTreePathFromFilePath(partialViewMacroResult.Result?.Path);
                        display.Id = System.Web.HttpUtility.UrlEncode(partialViewMacroResult.Result?.Path);
                        return display;
                    }

                    display.AddErrorNotification(
                        _localizedTextService.Localize("speechBubbles", "partialViewErrorHeader"),
                        _localizedTextService.Localize("speechBubbles", "partialViewErrorText"));
                    break;

                case Constants.Trees.Scripts:

                    var scriptResult = CreateOrUpdateScript(display);
                    display = _umbracoMapper.Map(scriptResult, display);
                    display.Path = Url.GetTreePathFromFilePath(scriptResult?.Path);
                    display.Id = System.Web.HttpUtility.UrlEncode(scriptResult?.Path);
                    return display;

                //display.AddErrorNotification(
                //    _localizedTextService.Localize("speechBubbles/partialViewErrorHeader"),
                //    _localizedTextService.Localize("speechBubbles/partialViewErrorText"));

                case Constants.Trees.Stylesheets:

                    var stylesheetResult = CreateOrUpdateStylesheet(display);
                    display = _umbracoMapper.Map(stylesheetResult, display);
                    display.Path = Url.GetTreePathFromFilePath(stylesheetResult?.Path);
                    display.Id = System.Web.HttpUtility.UrlEncode(stylesheetResult?.Path);
                    return display;

                default:
                    return NotFound();
            }

            return display;
        }

        /// <summary>
        /// Extracts "umbraco style rules" from a style sheet
        /// </summary>
        /// <param name="data">The style sheet data</param>
        /// <returns>The style rules</returns>
        public StylesheetRule[]? PostExtractStylesheetRules(StylesheetData data)
        {
            if (data.Content.IsNullOrWhiteSpace())
            {
                return new StylesheetRule[0];
            }

            return StylesheetHelper.ParseRules(data.Content)?.Select(rule => new StylesheetRule
            {
                Name = rule.Name,
                Selector = rule.Selector,
                Styles = rule.Styles
            }).ToArray();
        }

        /// <summary>
        /// Creates a style sheet from CSS and style rules
        /// </summary>
        /// <param name="data">The style sheet data</param>
        /// <returns>The style sheet combined from the CSS and the rules</returns>
        /// <remarks>
        /// Any "umbraco style rules" in the CSS will be removed and replaced with the rules passed in <see cref="data"/>
        /// </remarks>
        public string? PostInterpolateStylesheetRules(StylesheetData data)
        {
            // first remove all existing rules
            var existingRules = data.Content.IsNullOrWhiteSpace()
                ? new Cms.Core.Strings.Css.StylesheetRule[0]
                : StylesheetHelper.ParseRules(data.Content).ToArray();
            foreach (var rule in existingRules)
            {
                data.Content = StylesheetHelper.ReplaceRule(data.Content, rule.Name, null);
            }

            data.Content = data.Content?.TrimEnd(Constants.CharArrays.LineFeedCarriageReturn);

            // now add all the posted rules
            if (data.Rules != null && data.Rules.Any())
            {
                foreach (var rule in data.Rules)
                {
                    data.Content = StylesheetHelper.AppendRule(data.Content, new Cms.Core.Strings.Css.StylesheetRule
                    {
                        Name = rule.Name,
                        Selector = rule.Selector,
                        Styles = rule.Styles
                    });
                }

                data.Content += Environment.NewLine;
            }

            return data.Content;
        }

        /// <summary>
        /// Create or Update a Script
        /// </summary>
        /// <param name="display"></param>
        /// <returns></returns>
        /// <remarks>
        /// It's important to note that Scripts are DIFFERENT from cshtml files since scripts use IFileSystem and cshtml files
        /// use a normal file system because they must exist on a real file system for ASP.NET to work.
        /// </remarks>
        private IScript? CreateOrUpdateScript(CodeFileDisplay display)
        {
            return CreateOrUpdateFile(display, ".js", _fileSystems.ScriptsFileSystem,
                name => _fileService.GetScript(name),
                (script, userId) => _fileService.SaveScript(script, userId),
                name => new Script(name ?? string.Empty));
        }

        private IStylesheet? CreateOrUpdateStylesheet(CodeFileDisplay display)
        {
            return CreateOrUpdateFile(display, ".css", _fileSystems.StylesheetsFileSystem,
                name => _fileService.GetStylesheet(name),
                (stylesheet, userId) => _fileService.SaveStylesheet(stylesheet, userId),
                name => new Stylesheet(name ?? string.Empty)
            );
        }

        private T CreateOrUpdateFile<T>(CodeFileDisplay display, string extension, IFileSystem? fileSystem,
            Func<string?, T> getFileByName, Action<T, int?> saveFile, Func<string?, T> createFile) where T : IFile?
        {
            //must always end with the correct extension
            display.Name = EnsureCorrectFileExtension(display.Name, extension);

            var virtualPath = display.VirtualPath ?? string.Empty;
            // this is all weird, should be using relative paths everywhere!
            var relPath = fileSystem?.GetRelativePath(virtualPath);

            if (relPath?.EndsWith(extension) == false)
            {
                //this would typically mean it's new
                relPath = relPath.IsNullOrWhiteSpace()
                    ? relPath + display.Name
                    : relPath.EnsureEndsWith('/') + display.Name;
            }
            var currentUser = _backOfficeSecurityAccessor.BackOfficeSecurity?.CurrentUser;
            var file = getFileByName(relPath);
            if (file != null)
            {
                // might need to find the path
                var orgPath = file.Name is null ? string.Empty : file.OriginalPath.Substring(0, file.OriginalPath.IndexOf(file.Name));
                file.Path = orgPath + display.Name;

                file.Content = display.Content;
                //try/catch? since this doesn't return an Attempt?
                saveFile(file, currentUser?.Id);
            }
            else
            {
                file = createFile(relPath);
                if (file is not null)
                {
                    file.Content = display.Content;
                }

                saveFile(file, currentUser?.Id);
            }

            return file;
        }

        private Attempt<IPartialView?> CreateOrUpdatePartialView(CodeFileDisplay display)
        {
            return CreateOrUpdatePartialView(display, Constants.SystemDirectories.PartialViews,
                _fileService.GetPartialView, _fileService.SavePartialView, _fileService.CreatePartialView);
        }

        private Attempt<IPartialView?> CreateOrUpdatePartialViewMacro(CodeFileDisplay display)
        {
            return CreateOrUpdatePartialView(display, Constants.SystemDirectories.MacroPartials,
                _fileService.GetPartialViewMacro, _fileService.SavePartialViewMacro, _fileService.CreatePartialViewMacro);
        }

        /// <summary>
        /// Helper method to take care of persisting partial views or partial view macros - so we're not duplicating the same logic
        /// </summary>
        /// <param name="display"></param>
        /// <param name="systemDirectory"></param>
        /// <param name="getView"></param>
        /// <param name="saveView"></param>
        /// <param name="createView"></param>
        /// <returns></returns>
        private Attempt<IPartialView?> CreateOrUpdatePartialView(
            CodeFileDisplay display, string systemDirectory,
            Func<string, IPartialView?> getView,
            Func<IPartialView, int?, Attempt<IPartialView?>> saveView,
            Func<IPartialView, string?, int?, Attempt<IPartialView?>> createView)
        {
            //must always end with the correct extension
            display.Name = EnsureCorrectFileExtension(display.Name, ".cshtml");

            Attempt<IPartialView?> partialViewResult;
            var currentUser = _backOfficeSecurityAccessor.BackOfficeSecurity?.CurrentUser;

            var virtualPath = NormalizeVirtualPath(display.VirtualPath, systemDirectory);
            var view = getView(virtualPath);
            if (view != null)
            {
                // might need to find the path
                var orgPath = view.OriginalPath.Substring(0, view.OriginalPath.IndexOf(view.Name ?? string.Empty));
                view.Path = orgPath + display.Name;

                view.Content = display.Content;
                partialViewResult = saveView(view, currentUser?.Id);
            }
            else
            {
                view = new PartialView(PartialViewType.PartialView, virtualPath + display.Name);
                view.Content = display.Content;
                partialViewResult = createView(view, display.Snippet, currentUser?.Id);
            }

            return partialViewResult;
        }

        private string NormalizeVirtualPath(string? virtualPath, string systemDirectory)
        {
            if (virtualPath.IsNullOrWhiteSpace())
                return string.Empty;

            systemDirectory = systemDirectory.TrimStart("~");
            systemDirectory = systemDirectory.Replace('\\', '/');
            virtualPath = virtualPath!.TrimStart("~");
            virtualPath = virtualPath.Replace('\\', '/');
            virtualPath = virtualPath.ReplaceFirst(systemDirectory, string.Empty);

            return virtualPath;
        }

        private string? EnsureCorrectFileExtension(string? value, string extension)
        {
            if (value?.EndsWith(extension) == false)
                value += extension;

            return value;
        }

        private bool IsDirectory(string path)
        {
            var dirInfo = new DirectoryInfo(path);

            // If you turn off indexing in Windows this will have the attribute:
            // `FileAttributes.Directory | FileAttributes.NotContentIndexed`
            return (dirInfo.Attributes & FileAttributes.Directory) != 0;
        }

        // this is an internal class for passing stylesheet data from the client to the controller while editing
        public class StylesheetData
        {
            public string? Content { get; set; }

            public StylesheetRule[]? Rules { get; set; }
        }
    }
}
