Add support for adding and editing answers

MyApp.ServiceInterface/Data/QuestionsProvider.cs

@@ -11,6 +11,9 @@ public class QuestionsProvider(ILogger<QuestionsProvider> log, IMessageProducer
 {
     public const int MostVotedScore = 10;
     public const int AcceptedScore = 9;
+    public static List<string> ModelUserNames { get; } = [
+        "phi", "gemma-2b", "qwen-4b", "codellama", "gemma", "deepseek-coder", "mistral", "mixtral"
+    ];
     public static Dictionary<string,int> ModelScores = new()
     {
         ["phi"] = 1, //2.7B
@@ -99,6 +102,16 @@ await Task.WhenAll(
             r2.WriteFileAsync(virtualPath, contents),
             fs.WriteFileAsync(virtualPath, contents));
     }
+
+    public async Task DeleteFileAsync(string virtualPath)
+    {
+        fs.DeleteFile(virtualPath);
+        await r2.AmazonS3.DeleteObjectAsync(new Amazon.S3.Model.DeleteObjectRequest
+        {
+            BucketName = r2.BucketName,
+            Key = r2.SanitizePath(virtualPath),
+        });
+    }
 
     public async Task WriteMetaAsync(Meta meta)
     {
@@ -136,6 +149,31 @@ public async Task<QuestionFiles> GetQuestionAsync(int id)
         return questionFiles;
     }
 
+    public async Task<IVirtualFile?> GetAnswerFileAsync(string refId)
+    {
+        if (refId.IndexOf('-') < 0)
+            throw new ArgumentException("Invalid Answer Id", nameof(refId));
+
+        var postId = refId.LeftPart('-').ToInt();
+        var userName = refId.RightPart('-');
+        var answerPath = ModelUserNames.Contains(userName)
+            ? GetModelAnswerPath(postId, userName)
+            : GetHumanAnswerPath(postId, userName);
+
+        var file = fs.GetFile(answerPath)
+                ?? r2.GetFile(answerPath);
+
+        if (file == null)
+        {
+            // After first edit AI Model is converted to h. (Post) answer
+            var modelAnswerPath = GetHumanAnswerPath(postId, userName);
+            file = fs.GetFile(modelAnswerPath)
+                   ?? r2.GetFile(modelAnswerPath);
+        }
+
+        return file;
+    }
+
     public async Task SaveQuestionAsync(Post post)
     {
         await SaveFileAsync(GetQuestionPath(post.Id), ToJson(post));
@@ -168,6 +206,61 @@ public async Task SaveRemoteFileAsync(string virtualPath, string contents)
     {
         await r2.WriteFileAsync(virtualPath, contents);
     }
+
+    public async Task SaveAnswerEditAsync(IVirtualFile existingAnswer, string userName, string body, string editReason)
+    {
+        var now = DateTime.UtcNow;
+        var existingAnswerJson = await existingAnswer.ReadAllTextAsync();
+        var tasks = new List<Task>();
+
+        var fileName = existingAnswer.VirtualPath.TrimStart('/').Replace("/", "");
+        var postId = fileName.LeftPart('.').ToInt();
+        string existingAnswerBy = "";
+        var newAnswer = new Post
+        {
+            Id = postId,
+        };
+
+        if (fileName.Contains(".a."))
+        {
+            existingAnswerBy = fileName.RightPart(".a.").LastLeftPart('.');
+            var datePart = DateTime.UtcNow.ToString("yyMMdd-HHmmss");
+            var editFilePath = existingAnswer.VirtualPath.LastLeftPart('/') + "/edit.a." + postId + "-" + userName + "_" + datePart + ".json";
+            tasks.Add(SaveFileAsync(editFilePath, existingAnswerJson));
+            tasks.Add(DeleteFileAsync(existingAnswer.VirtualPath));
+
+            var obj = (Dictionary<string,object>)JSON.parse(existingAnswerJson);
+            newAnswer.CreationDate = obj.TryGetValue("created", out var oCreated) && oCreated is int created
+                ? DateTimeOffset.FromUnixTimeSeconds(created).DateTime
+                : existingAnswer.LastModified;
+        }
+        else if (fileName.Contains(".h."))
+        {
+            existingAnswerBy = fileName.RightPart(".h.").LastLeftPart('.');
+            var datePart = DateTime.UtcNow.ToString("yyMMdd-HHmmss");
+            newAnswer = existingAnswerJson.FromJson<Post>();
+
+            // Just override the existing answer if it's the same user 
+            if (newAnswer.ModifiedBy != userName)
+            {
+                var editFilePath = existingAnswer.VirtualPath.LastLeftPart('/') + "/edit.h." + postId + "-" + userName + "_" + datePart + ".json";
+                tasks.Add(SaveFileAsync(editFilePath, existingAnswerJson));
+            }
+        }
+        else throw new ArgumentException($"Invalid Answer File {existingAnswer.Name}", nameof(existingAnswer));
+
+        newAnswer.Body = body;
+        newAnswer.CreatedBy ??= existingAnswerBy;
+        newAnswer.ModifiedBy = userName;
+        newAnswer.LastEditDate = now;
+        newAnswer.ModifiedReason = editReason;
+
+        var newFileName = $"{existingAnswer.Name.LeftPart('.')}.h.{existingAnswerBy}.json";
+        var newFilePath = existingAnswer.VirtualPath.LastLeftPart('/') + "/" + newFileName;
+        tasks.Add(SaveFileAsync(newFilePath, ToJson(newAnswer)));
+
+        await Task.WhenAll(tasks);
+    }
 
     public async Task DeleteQuestionFilesAsync(int id)
     {

MyApp.ServiceInterface/QuestionServices.cs

@@ -61,6 +61,11 @@ public async Task<object> Any(AskQuestion request)
         };
     }
 
+    public async Task<object> Any(EditQuestion request)
+    {
+        return new EditQuestionResponse();
+    }
+
     public async Task<EmptyResponse> Any(DeleteQuestion request)
     {
         await questions.DeleteQuestionFilesAsync(request.Id);
@@ -99,6 +104,27 @@ public async Task<object> Any(AnswerQuestion request)
         return new AnswerQuestionResponse();
     }
 
+    /* /100/000
+     *   001.a.model.json <OpenAI>
+     * Edit 1:
+     *   001.h.model.json <Post>
+     *   edit.a.001-model_20240301-1200.json // original model answer, Modified Date <OpenAI>
+     * Edit 2:
+     *   001.h.model.json <Post> #2
+     *   edit.a.001-model_20240301-130303.json // #1 edit model answer, Modified Date <Post>
+     *   edit.a.001-model_20240301-120101.json // #0 original model answer, Modified Date <OpenAI>
+     */
+    public async Task<object> Any(EditAnswer request)
+    {
+        var answerFile = await questions.GetAnswerFileAsync(request.Id);
+        if (answerFile == null)
+            throw HttpError.NotFound("Answer does not exist");
+
+        await questions.SaveAnswerEditAsync(answerFile, GetUserName(), request.Body, request.EditReason);
+
+        return new EditAnswerResponse();
+    }
+
     public async Task<object> Any(GetQuestionFile request)
     {
         var questionFiles = await questions.GetQuestionFilesAsync(request.Id);
@@ -108,6 +134,29 @@ public async Task<object> Any(GetQuestionFile request)
         return new HttpResult(file, MimeTypes.Json);
     }
 
+    public async Task<object> Any(GetAnswerBody request)
+    {
+        var answerFile = await questions.GetAnswerFileAsync(request.Id);
+        if (answerFile == null)
+            throw HttpError.NotFound("Answer does not exist");
+
+        var json = await answerFile.ReadAllTextAsync();
+        if (answerFile.Name.Contains(".a."))
+        {
+            var obj = (Dictionary<string,object>)JSON.parse(json);
+            var choices = (List<object>) obj["choices"];
+            var choice = (Dictionary<string,object>)choices[0];
+            var message = (Dictionary<string,object>)choice["message"];
+            var body = (string)message["content"];
+            return new HttpResult(body, MimeTypes.PlainText);
+        }
+        else
+        {
+            var answer = json.FromJson<Post>();
+            return new HttpResult(answer.Body, MimeTypes.PlainText);
+        }
+    }
+
     public async Task Any(CreateWorkerAnswer request)
     {
         var json = request.Json;

MyApp.ServiceModel/Posts.cs

@@ -1,7 +1,6 @@
 // Complete declarative AutoQuery services for Bookings CRUD example:
 // https://docs.servicestack.net/autoquery-crud-bookings
 
-using System.ComponentModel.DataAnnotations;
 using ServiceStack;
 using ServiceStack.DataAnnotations;
 
@@ -54,7 +53,13 @@ public class Post
 
     public string? RefId { get; set; }
 
-    [Ignore] public string? Body { get; set; }
+    public string? Body { get; set; }
+
+    public string? ModifiedReason { get; set; }
+
+    public DateTime? LockedDate { get; set; }
+
+    public string? LockedReason { get; set; }
 }
 
 public class PostJob
@@ -271,7 +276,6 @@ public class AskQuestion : IPost, IReturn<AskQuestionResponse>
     [Input(Type="hidden")]
     public string? RefId { get; set; }
 }
-
 public class AskQuestionResponse
 {
     public int Id { get; set; }
@@ -280,6 +284,26 @@ public class AskQuestionResponse
     public ResponseStatus? ResponseStatus { get; set; }
 }
 
+[ValidateIsAuthenticated]
+public class EditQuestion : IPost, IReturn<EditQuestionResponse>
+{
+    [ValidateNotEmpty, ValidateMinimumLength(20), ValidateMaximumLength(120)]
+    [Input(Type = "text", Help = "A summary of what your main question is asking"), FieldCss(Field="col-span-12")]
+    public required string Title { get; set; }
+
+    [ValidateNotEmpty, ValidateMinimumLength(30), ValidateMaximumLength(32768)]
+    [Input(Type="MarkdownInput", Help = "Include all information required for someone to identity and resolve your exact question"), FieldCss(Field="col-span-12", Input="h-60")]
+    public required string Body { get; set; }
+
+    [ValidateNotEmpty, ValidateMinimumLength(2, Message = "At least 1 tag required"), ValidateMaximumLength(120)]
+    [Input(Type = "tag", Help = "Up to 5 tags relevant to your question"), FieldCss(Field="col-span-12")]
+    public required List<string> Tags { get; set; }
+}
+public class EditQuestionResponse
+{
+    public ResponseStatus? ResponseStatus { get; set; }
+}
+
 [ValidateIsAuthenticated]
 [Description("Your Answer")]
 public class AnswerQuestion : IPost, IReturn<AnswerQuestionResponse>
@@ -300,11 +324,37 @@ public class AnswerQuestionResponse
     public ResponseStatus? ResponseStatus { get; set; }
 }
 
+[ValidateIsAuthenticated]
+[Description("Your Answer")]
+public class EditAnswer : IPost, IReturn<EditAnswerResponse>
+{
+    [Input(Type="hidden")]
+    [ValidateNotEmpty]
+    public required string Id { get; set; }
+
+    [ValidateNotEmpty, ValidateMinimumLength(30), ValidateMaximumLength(32768)]
+    [Input(Type="MarkdownInput", Label=""), FieldCss(Field="col-span-12", Input="h-60")]
+    public required string Body { get; set; }
+
+    [Input(Type="text", Placeholder="Short summary of this edit (e.g. corrected spelling, grammar, improved formatting)"),FieldCss(Field = "col-span-12")]
+    [ValidateNotEmpty, ValidateMinimumLength(4)]
+    public required string EditReason { get; set; }
+}
+public class EditAnswerResponse
+{
+    public ResponseStatus? ResponseStatus { get; set; }
+}
+
 public class PreviewMarkdown : IPost, IReturn<string>
 {
     public string Markdown { get; set; }
 }
 
+public class GetAnswerBody : IGet, IReturn<string>
+{
+    public string Id { get; set; }
+}
+
 [ValidateHasRole(Roles.Moderator)]
 public class DeleteQuestion : IGet, IReturn<EmptyResponse>
 {

MyApp/Components/App.razor

@@ -32,7 +32,7 @@
     })
     </script>
     <script src="lib/js/highlight.js"></script>
-    <script>hljs.highlightAll()</script>
+    <script src="lib/js/default.js"></script>
 </body>
 
 </html>

MyApp/Components/Pages/Questions/LiveAnswers.razor

@@ -67,6 +67,15 @@
                         </div>
                     </div>
                 }
+                else
+                {
+                    <div class="float-right">
+                        <a href=@QuestionPath class="whitespace-nowrap font-medium text-indigo-700 dark:text-indigo-300 hover:text-indigo-500">
+                            full question page
+                            <span aria-hidden="true"> &rarr;</span>
+                        </a>
+                    </div>
+                }
 
                 <div id="answers" class="mt-8">
                     @if (question.Answers.Count > 0)

MyApp/Components/Shared/QuestionPost.razor

@@ -21,18 +21,21 @@
                     {
                         <span>asked</span>
                     }
-                    <b>@((DateTime.UtcNow - Question.Post.CreationDate).TimeAgo())</b>
+                    <b class="ml-1">@((DateTime.UtcNow - Question.Post.CreationDate).TimeAgo())</b>
                 </div>
                 @if (Question.Post.LastEditDate != null)
                 {
                     <div>
                         <b>@((DateTime.UtcNow - Question.Post.LastEditDate.Value).TimeAgo())</b>
                     </div>
                 }
-                <div>
-                    <span>viewed</span>
-                    <b>@($"{Question.ViewCount:n0}") times</b>
-                </div>
+                @if (Question.ViewCount > 1)
+                {
+                    <div>
+                        <span>viewed</span>
+                        <b>@($"{Question.ViewCount:n0}") times</b>
+                    </div>
+                }
             </div>
             @if (Question.Post.CreatedBy != null)
             {
@@ -103,7 +106,7 @@
     </article>
 
     <div id="answers" class="mt-16">
-        @if (@Question.Answers.Count > 0)
+        @if (Question.Answers.Count > 0)
         {
             <h3 class="text-2xl font-semibold">
                 @Question.Answers.Count Answers
@@ -112,7 +115,7 @@
         <div>
             @foreach (var answer in Question.Answers)
             {
-                <div class="py-8 border-b border-gray-200 dark:border-gray-700">
+                <div data-answer=@answer.Id class="py-8 border-b border-gray-200 dark:border-gray-700">
                     <div class="flex">
                         <div class="md:w-32 pr-2">
                             <div id=@answer.Id class="voting flex flex-col items-center">
@@ -128,12 +131,16 @@
                                 <div class="hidden md:block text-center whitespace-nowrap text-xs xl:text-sm font-semibold">@userName</div>
                             </div>
                         </div>
-                        <div class="xl:flex-grow prose">
+                        <div id=@($"preview-{answer.Id}") class="preview xl:flex-grow prose">
                             @BlazorHtml.Raw(Markdown.GenerateHtml(answer.Choices.FirstOrDefault()?.Message.Content))
                         </div>
+                        <div id=@($"edit-{answer.Id}") class="edit w-full pl-2 hidden"></div>
                     </div>
-                    <div class="mt-4 flex justify-end text-gray-700 dark:text-gray-200 text-sm">
-                        answered <time class="ml-2" datetime="@Markdown.GetDateTimestamp(DateTimeOffset.FromUnixTimeSeconds(answer.Created).DateTime)">@Markdown.GetDateLabel(DateTimeOffset.FromUnixTimeSeconds(answer.Created).DateTime)</time>
+                    <div class="mt-6 flex justify-between">
+                        <div class="pl-10 md:pl-20 xl:pl-32"><span class="edit-link cursor-pointer select-none text-indigo-700 dark:text-indigo-300 hover:text-indigo-500"></span></div>
+                        <div class="text-gray-700 dark:text-gray-200 text-sm">
+                            answered <time class="ml-1" datetime="@Markdown.GetDateTimestamp(DateTimeOffset.FromUnixTimeSeconds(answer.Created).DateTime)">@Markdown.GetDateLabel(DateTimeOffset.FromUnixTimeSeconds(answer.Created).DateTime)</time>
+                        </div>
                     </div>
                 </div>
                 @if (Question.GetAnswerComments(answer.Id).Count > 0)

MyApp/Configure.Renderer.cs

@@ -86,7 +86,7 @@ public async Task Any(RenderComponent request)
             foreach (var remoteFile in remoteFiles.Files)
             {
                 var localFile = localFiles.Files.FirstOrDefault(x => x.Name == remoteFile.Name);
-                if (localFile == null || localFile.LastModified < remoteFile.LastModified)
+                if (localFile == null || localFile.Length != remoteFile.Length)
                 {
                     log.LogInformation("Saving local file for {State} {Path}", localFile == null ? "new" : "modified", remoteFile.VirtualPath);
                     var remoteContents = await remoteFile.ReadAllTextAsync();

MyApp/Program.cs

@@ -38,7 +38,7 @@
 services.AddIdentityCore<ApplicationUser>(options =>
     {
         options.SignIn.RequireConfirmedAccount = true;
-        options.User.AllowedUserNameCharacters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-._";
+        options.User.AllowedUserNameCharacters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-.";
     })
     .AddRoles<IdentityRole>()
     .AddEntityFrameworkStores<ApplicationDbContext>()