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Yes.Application/Admins/Themes/DeleteThemeCommandHandler.cs

@@ -0,0 +1,59 @@
+namespace Yes.Application.Admins.Themes
+{
+    public record DeleteThemeCommand(string ThemeName) : IRequest<DeleteThemeCommandResponse>;
+
+    public record DeleteThemeCommandResponse();
+    public class DeleteThemeCommandHandler(
+        IWebHostEnvironment env,
+        BlogDbContext db,
+        IIdentityContext identity,
+        IOptionsMonitor<BlogSettings> options) : IRequestHandler<DeleteThemeCommand, DeleteThemeCommandResponse>
+    {
+        private readonly IWebHostEnvironment _env = env;
+        private readonly BlogSettings _settings = options.CurrentValue;
+        private readonly BlogDbContext _db = db;
+        private readonly IIdentityContext _identity = identity;
+
+        public async Task<DeleteThemeCommandResponse> Handle(DeleteThemeCommand request, CancellationToken cancellationToken)
+        {
+            var identityUser = await _db.Users.FindAsync(_identity.Id);
+            if (identityUser == null)
+            {
+                throw new UserNotExistsException(_identity.Id);
+            }
+
+            if (!identityUser.IsSystemUser())
+            {
+                throw new AccessDeniedException();
+            }
+
+
+            try
+            {
+                var themeName = request.ThemeName;
+
+                if (_settings.Theme == themeName)
+                {
+                    throw new ThemeInUseException();
+                }
+
+
+                var targetDirectory = Path.Combine(_env.ContentRootPath, "files", "themes", themeName);
+
+
+                if (Directory.Exists(targetDirectory))
+                    Directory.Delete(targetDirectory, recursive: true);
+
+                return new DeleteThemeCommandResponse();
+            }
+            catch (Exception ex) when (ex is OverflowException)
+            {
+                throw new FileOverflowException();
+            }
+            catch (Exception ex) when (ex is InvalidDataException)
+            {
+                throw new FileNotSupportedException(ex.Message);
+            }
+        }
+    }
+}