feat: add release communications

backend/src/Socialize.Api/Modules/ReleaseCommunications/Handlers/GetUnreadReleaseUpdates.cs

@@ -0,0 +1,42 @@
+using FastEndpoints;
+using Microsoft.EntityFrameworkCore;
+using Socialize.Api.Data;
+using Socialize.Api.Infrastructure.Security;
+using Socialize.Api.Modules.ReleaseCommunications.Contracts;
+using Socialize.Api.Modules.ReleaseCommunications.Data;
+using Socialize.Api.Modules.ReleaseCommunications.Services;
+
+namespace Socialize.Api.Modules.ReleaseCommunications.Handlers;
+
+internal class GetUnreadReleaseUpdatesHandler(AppDbContext dbContext)
+    : EndpointWithoutRequest<ReleaseUpdateUnreadSummaryDto>
+{
+    public override void Configure()
+    {
+        Get("/api/release-updates/unread");
+        Options(o => o.WithTags("Release Communications"));
+    }
+
+    public override async Task HandleAsync(CancellationToken ct)
+    {
+        Guid userId = User.GetUserId();
+        ReleaseUpdateAudienceContext audienceContext =
+            await ReleaseUpdateVisibility.GetAudienceContextAsync(dbContext, User, userId, ct);
+
+        List<ReleaseUpdate> unreadUpdates = await dbContext.ReleaseUpdates
+            .VisibleTo(audienceContext)
+            .Where(update => !dbContext.ReleaseUpdateReadReceipts.Any(receipt =>
+                receipt.ReleaseUpdateId == update.Id &&
+                receipt.UserId == userId))
+            .OrderByDescending(update => update.PublishedAt)
+            .ThenByDescending(update => update.CreatedAt)
+            .ToListAsync(ct);
+
+        await SendOkAsync(
+            new ReleaseUpdateUnreadSummaryDto(
+                unreadUpdates.Count,
+                unreadUpdates.Count(update => update.Importance == ReleaseUpdateImportance.Important),
+                unreadUpdates.Select(update => update.ToDto(false)).ToArray()),
+            ct);
+    }
+}