Added the possibility to attach files to the chat (#585)

Co-authored-by: Thorsten Sommer

app/MindWork AI Studio/Chat/ContentBlockComponent.razor

@@ -16,11 +16,19 @@
             </MudText>
         </CardHeaderContent>
         <CardHeaderActions>
+            @if (this.Content.FileAttachments.Count > 0)
+            {
+                <MudTooltip Text="@T("Number of attachments")" Placement="Placement.Bottom">
+                    <MudBadge Content="@this.Content.FileAttachments.Count" Color="Color.Primary" Overlap="true" BadgeClass="sources-card-header">
+                        <MudIconButton Icon="@Icons.Material.Filled.AttachFile" />
+                    </MudBadge>
+                </MudTooltip>
+            }
             @if (this.Content.Sources.Count > 0)
             {
                 <MudTooltip Text="@T("Number of sources")" Placement="Placement.Bottom">
                     <MudBadge Content="@this.Content.Sources.Count" Color="Color.Primary" Overlap="true" BadgeClass="sources-card-header">
-                        <MudIconButton Icon="@Icons.Material.Filled.Link" />
+                        <MudIconButton Icon="@Icons.Material.Filled.Link"/>
                     </MudBadge>
                 </MudTooltip>
             }

app/MindWork AI Studio/Chat/ContentImage.cs

@@ -30,6 +30,9 @@ public sealed class ContentImage : IContent, IImageSource
     /// <inheritdoc />
     public List<Source> Sources { get; set; } = [];
 
+    /// <inheritdoc />
+    public List<string> FileAttachments { get; set; } = [];
+
     /// <inheritdoc />
     public Task<ChatThread> CreateFromProviderAsync(IProvider provider, Model chatModel, IContent? lastUserPrompt, ChatThread? chatChatThread, CancellationToken token = default)
     {

app/MindWork AI Studio/Chat/ContentText.cs

@@ -1,3 +1,4 @@
+using System.Text;
 using System.Text.Json.Serialization;
 
 using AIStudio.Provider;
@@ -39,6 +40,9 @@ public sealed class ContentText : IContent
 
     /// <inheritdoc />
     public List<Source> Sources { get; set; } = [];
+    
+    /// <inheritdoc />
+    public List<string> FileAttachments { get; set; } = [];
 
     /// <inheritdoc />
     public async Task<ChatThread> CreateFromProviderAsync(IProvider provider, Model chatModel, IContent? lastUserPrompt, ChatThread? chatThread, CancellationToken token = default)
@@ -139,9 +143,44 @@ public sealed class ContentText : IContent
         Text = this.Text,
         InitialRemoteWait = this.InitialRemoteWait,
         IsStreaming = this.IsStreaming,
+        Sources = [..this.Sources],
+        FileAttachments = [..this.FileAttachments],
     };
 
     #endregion
+
+    public async Task<string> PrepareContentForAI()
+    {
+        var sb = new StringBuilder();
+        sb.AppendLine(this.Text);
+
+        if(this.FileAttachments.Count > 0)
+        {
+            // Check Pandoc availability once before processing file attachments
+            var pandocState = await Pandoc.CheckAvailabilityAsync(Program.RUST_SERVICE, showMessages: true, showSuccessMessage: false);
+
+            if (!pandocState.IsAvailable)
+                LOGGER.LogWarning("File attachments could not be processed because Pandoc is not available.");
+            else if (!pandocState.CheckWasSuccessful)
+                LOGGER.LogWarning("File attachments could not be processed because the Pandoc version check failed.");
+            else
+            {
+                sb.AppendLine();
+                sb.AppendLine("The following files are attached to this message:");
+                foreach(var file in this.FileAttachments)
+                {
+                    sb.AppendLine();
+                    sb.AppendLine("---------------------------------------");
+                    sb.AppendLine($"File path: {file}");
+                    sb.AppendLine("File content:");
+                    sb.AppendLine("````");
+                    sb.AppendLine(await Program.RUST_SERVICE.ReadArbitraryFileData(file, int.MaxValue));
+                    sb.AppendLine("````");
+                }
+            }
+        }
+        return sb.ToString();
+    }
     
     /// <summary>
     /// The text content.

app/MindWork AI Studio/Chat/IContent.cs

@@ -47,6 +47,13 @@ public interface IContent
     /// </remarks>
     [JsonIgnore]
     public List<Source> Sources { get; set; }
+
+    /// <summary>
+    /// Represents a collection of file attachments associated with the content.
+    /// This property contains a list of file paths that are appended
+    /// to the content to provide additional context or resources.
+    /// </summary>
+    public List<string> FileAttachments { get; set; }
     
     /// <summary>
     /// Uses the provider to create the content.

app/MindWork AI Studio/Chat/ListContentBlockExtensions.cs

@@ -0,0 +1,25 @@
+namespace AIStudio.Chat;
+
+public static class ListContentBlockExtensions
+{
+    /// <summary>
+    /// Processes a list of content blocks by transforming them into a collection of message results asynchronously.
+    /// </summary>
+    /// <param name="blocks">The list of content blocks to process.</param>
+    /// <param name="transformer">A function that transforms each content block into a message result asynchronously.</param>
+    /// <typeparam name="TResult">The type of the result produced by the transformation function.</typeparam>
+    /// <returns>An asynchronous task that resolves to a list of transformed results.</returns>
+    public static async Task<IList<TResult>> BuildMessages<TResult>(this List<ContentBlock> blocks, Func<ContentBlock, Task<TResult>> transformer)
+    {
+        var messages = blocks
+            .Where(n => n.ContentType is ContentType.TEXT && !string.IsNullOrWhiteSpace((n.Content as ContentText)?.Text))
+            .Select(transformer)
+            .ToList();
+        
+        // Await all messages:
+        await Task.WhenAll(messages);
+
+        // Select all results:
+        return messages.Select(n => n.Result).ToList();
+    }
+}