Add chat bulk actions and avatar cache

server/QMax.Api/Controllers/ChatsController.cs

@@ -121,6 +121,86 @@ public sealed class ChatsController(
         return NoContent();
     }
 
+    [HttpPost("clear-history")]
+    public async Task<IActionResult> ClearHistories(ChatBulkActionRequest request, CancellationToken cancellationToken)
+    {
+        var chatIds = request.ChatIds.Distinct().ToArray();
+        if (chatIds.Length == 0)
+        {
+            return BadRequest("chatIds are required.");
+        }
+
+        var chats = await LoadChatsWithAttachmentsAsync(chatIds, cancellationToken);
+        if (chats.Count != chatIds.Length)
+        {
+            return NotFound();
+        }
+
+        foreach (var chat in chats)
+        {
+            var maxFailure = await TryApplyMaxChatActionAsync(
+                chat,
+                (externalChatId, chatUrl) => maxBridge.ClearChatHistoryAsync(externalChatId, chatUrl, cancellationToken),
+                "clear history",
+                cancellationToken);
+            if (maxFailure is not null)
+            {
+                return maxFailure;
+            }
+        }
+
+        var files = AttachmentFiles(chats).ToArray();
+        foreach (var chat in chats)
+        {
+            db.Messages.RemoveRange(chat.Messages);
+            chat.LastMessageAt = null;
+            chat.LastMessagePreview = null;
+            chat.UnreadCount = 0;
+            chat.UpdatedAt = DateTimeOffset.UtcNow;
+        }
+
+        await db.SaveChangesAsync(cancellationToken);
+        DeleteFiles(files);
+        await hubContext.Clients.All.SendAsync("ChatListInvalidated", cancellationToken);
+        return NoContent();
+    }
+
+    [HttpPost("delete")]
+    public async Task<IActionResult> DeleteChats(ChatBulkActionRequest request, CancellationToken cancellationToken)
+    {
+        var chatIds = request.ChatIds.Distinct().ToArray();
+        if (chatIds.Length == 0)
+        {
+            return BadRequest("chatIds are required.");
+        }
+
+        var chats = await LoadChatsWithAttachmentsAsync(chatIds, cancellationToken);
+        if (chats.Count != chatIds.Length)
+        {
+            return NotFound();
+        }
+
+        foreach (var chat in chats)
+        {
+            var maxFailure = await TryApplyMaxChatActionAsync(
+                chat,
+                (externalChatId, chatUrl) => maxBridge.DeleteChatAsync(externalChatId, chatUrl, cancellationToken),
+                "delete chat",
+                cancellationToken);
+            if (maxFailure is not null)
+            {
+                return maxFailure;
+            }
+        }
+
+        var files = AttachmentFiles(chats).ToArray();
+        db.Chats.RemoveRange(chats);
+        await db.SaveChangesAsync(cancellationToken);
+        DeleteFiles(files);
+        await hubContext.Clients.All.SendAsync("ChatListInvalidated", cancellationToken);
+        return NoContent();
+    }
+
     [HttpGet("{chatId:guid}/search")]
     public async Task<ActionResult<IReadOnlyList<MessageDto>>> SearchMessages(
         Guid chatId,
@@ -656,6 +736,56 @@ public sealed class ChatsController(
             statusCode: StatusCodes.Status409Conflict);
     }
 
+    private async Task<ActionResult?> TryApplyMaxChatActionAsync(
+        Chat chat,
+        Func<string, string?, Task<MaxActionResult>> action,
+        string actionName,
+        CancellationToken cancellationToken)
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+
+        if (string.IsNullOrWhiteSpace(chat.ExternalId))
+        {
+            return null;
+        }
+
+        var result = await action(chat.ExternalId, chat.WebUrl);
+        if (result.Success)
+        {
+            return null;
+        }
+
+        return Problem(
+            result.Error ?? $"MAX {actionName} action failed for {chat.Title}.",
+            statusCode: StatusCodes.Status409Conflict);
+    }
+
+    private async Task<List<Chat>> LoadChatsWithAttachmentsAsync(IReadOnlyCollection<Guid> chatIds, CancellationToken cancellationToken)
+    {
+        return await db.Chats
+            .Include(x => x.Messages)
+            .ThenInclude(x => x.Attachments)
+            .Where(x => chatIds.Contains(x.Id))
+            .ToListAsync(cancellationToken);
+    }
+
+    private IEnumerable<string> AttachmentFiles(IEnumerable<Chat> chats)
+    {
+        return chats
+            .SelectMany(x => x.Messages)
+            .SelectMany(x => x.Attachments)
+            .Select(x => storage.GetPath(x.StorageFileName))
+            .Where(System.IO.File.Exists);
+    }
+
+    private static void DeleteFiles(IEnumerable<string> files)
+    {
+        foreach (var file in files)
+        {
+            System.IO.File.Delete(file);
+        }
+    }
+
     private static string? NormalizeReaction(string? value)
     {
         var emoji = value?.Trim();