Retructured solution

LiteCharms.Features/Shop/Notifications/Queries/GetNotificationQuery.cs

@@ -0,0 +1,18 @@
+using LiteCharms.Features.Shop.Notifications.Models;
+
+namespace LiteCharms.Features.Notifications.Queries;
+
+public class GetNotificationQuery : IRequest<Result<Notification>>
+{
+    public Guid NotificationId { get; set; }
+
+    private GetNotificationQuery(Guid notificationId) => NotificationId = notificationId;
+
+    public static GetNotificationQuery Create(Guid notificationId)
+    {
+        if (notificationId == Guid.Empty)
+            throw new ArgumentException("Notification ID is required.", nameof(notificationId));
+
+        return new(notificationId);
+    }
+}

LiteCharms.Features/Shop/Notifications/Queries/GetNotificationsQuery.cs

@@ -0,0 +1,30 @@
+using LiteCharms.Features.Shop.Notifications.Models;
+
+namespace LiteCharms.Features.Notifications.Queries;
+
+public class GetNotificationsQuery : IRequest<Result<Notification[]>>
+{
+    public DateOnly From { get; set; }
+
+    public DateOnly To { get; set; }
+
+    public int MaxRecords { get; set; }
+
+    private GetNotificationsQuery(DateOnly from, DateOnly to, int maxRecords = 1000)
+    {
+        From = from;
+        To = to;
+        MaxRecords = maxRecords;
+    }
+
+    public static GetNotificationsQuery Create(DateOnly from, DateOnly to, int maxRecords = 1000)
+    {
+        if (from > to)  
+            throw new ArgumentException("From date cannot be greater than To date.");
+
+        if(maxRecords <= 0)  
+            throw new ArgumentException("MaxRecords must be a positive integer.", nameof(maxRecords));
+
+        return new(from, to, maxRecords);
+    }
+}

LiteCharms.Features/Shop/Notifications/Queries/Handlers/GetNotificationQueryHandler.cs

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+using LiteCharms.Extensions;
+using LiteCharms.Features.Shop.Notifications.Models;
+using LiteCharms.Features.Shop.Postgres;
+
+namespace LiteCharms.Features.Notifications.Queries.Handlers;
+
+public class GetNotificationQueryHandler(IDbContextFactory<ShopDbContext> contextFactory) : IRequestHandler<GetNotificationQuery, Result<Notification>>
+{
+    public async ValueTask<Result<Notification>> Handle(GetNotificationQuery request, CancellationToken cancellationToken)
+    {
+        try
+        {
+            await using var context = await contextFactory.CreateDbContextAsync(cancellationToken);
+
+            var notification = await context.Notifications.FirstOrDefaultAsync(n => n.Id == request.NotificationId, cancellationToken);
+
+            return notification is not null 
+                ? Result.Ok(notification.ToModel())
+                : Result.Fail<Notification>(new Error($"Notification with id {request.NotificationId} not found"));
+        }
+        catch (Exception ex)
+        {
+            return Result.Fail<Notification>(new Error(ex.Message).CausedBy(ex));
+        }
+    }
+}

LiteCharms.Features/Shop/Notifications/Queries/Handlers/GetNotificationsQueryHandler.cs

@@ -0,0 +1,33 @@
+using LiteCharms.Extensions;
+using LiteCharms.Features.Shop.Notifications.Models;
+using LiteCharms.Features.Shop.Postgres;
+
+namespace LiteCharms.Features.Notifications.Queries.Handlers;
+
+public class GetNotificationsQueryHandler(IDbContextFactory<ShopDbContext> contextFactory) : IRequestHandler<GetNotificationsQuery, Result<Notification[]>>
+{
+    public async ValueTask<Result<Notification[]>> Handle(GetNotificationsQuery request, CancellationToken cancellationToken)
+    {
+		try
+		{
+            var fromDate = request.From.ToDateTime(TimeOnly.MinValue);
+            var toDate = request.To.ToDateTime(TimeOnly.MaxValue);
+
+            using var context = await contextFactory.CreateDbContextAsync(cancellationToken);
+
+            var notifications = await context.Notifications.AsNoTracking()
+                .Where(n => n.CreatedAt >= fromDate && n.CreatedAt <= toDate)
+                .OrderByDescending(n => n.CreatedAt)
+                .Take(request.MaxRecords)
+                .ToArrayAsync(cancellationToken);
+
+            return notifications?.Length > 0 
+                ? Result.Ok(notifications.Select(n => n.ToModel()).ToArray()) 
+                : Result.Fail(new Error($"No notifications found for the specified date range {request.From} to {request.To}."));
+        }
+		catch (Exception ex)
+		{
+            return Result.Fail(new Error(ex.Message).CausedBy(ex));
+        }
+    }
+}