Retructured solution

LiteCharms.Features/Shop/Customers/Queries/GetCustomerQuery.cs

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

LiteCharms.Features/Shop/Customers/Queries/GetCustomersQuery.cs

@@ -0,0 +1,30 @@
+using LiteCharms.Features.Shop.Customers.Models;
+
+namespace LiteCharms.Features.Customers.Queries;
+
+public class GetCustomersQuery : IRequest<Result<Customer[]>>
+{
+    public DateOnly From { get; set; }
+
+    public DateOnly To { get; set; }
+
+    public int MaxRecords { get; set; }
+
+    private GetCustomersQuery(DateOnly from, DateOnly to, int maxRecords = 1000)
+    {
+        From = from;
+        To = to;
+        MaxRecords = maxRecords;
+    }
+
+    public static GetCustomersQuery 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.");
+
+        return new(from, to, maxRecords);
+    }
+}

LiteCharms.Features/Shop/Customers/Queries/Handlers/GetCustomerQueryHandler.cs

@@ -0,0 +1,26 @@
+using LiteCharms.Extensions;
+using LiteCharms.Features.Shop.Customers.Models;
+using LiteCharms.Features.Shop.Postgres;
+
+namespace LiteCharms.Features.Customers.Queries.Handlers;
+
+public class GetCustomerQueryHandler(IDbContextFactory<ShopDbContext> contextFactory) : IRequestHandler<GetCustomerQuery, Result<Customer>>
+{
+    public async ValueTask<Result<Customer>> Handle(GetCustomerQuery request, CancellationToken cancellationToken)
+    {
+		try
+		{
+            using var context = await contextFactory.CreateDbContextAsync(cancellationToken);
+
+            var customer = await context.Customers.FirstOrDefaultAsync(c => c.Id == request.CustomerId, cancellationToken);
+
+            return customer is not null
+                ? Result.Ok(customer.ToModel())
+                : Result.Fail<Customer>($"Customer not found with id {request.CustomerId}");
+        }
+		catch (Exception ex)
+		{
+            return Result.Fail<Customer>(new Error(ex.Message).CausedBy(ex));
+        }
+    }
+}

LiteCharms.Features/Shop/Customers/Queries/Handlers/GetCustomersQueryHandler.cs

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+using LiteCharms.Extensions;
+using LiteCharms.Features.Shop.Customers.Models;
+using LiteCharms.Features.Shop.Postgres;
+
+namespace LiteCharms.Features.Customers.Queries.Handlers;
+
+public class GetCustomersQueryHandler(IDbContextFactory<ShopDbContext> contextFactory) : IRequestHandler<GetCustomersQuery, Result<Customer[]>>
+{
+    public async ValueTask<Result<Customer[]>> Handle(GetCustomersQuery 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 customers = await context.Customers.AsNoTracking()
+                .OrderByDescending(o => o.CreatedAt)
+                .Where(c => c.CreatedAt >= fromDate && c.CreatedAt <= toDate)
+                .Take(request.MaxRecords)
+                .ToArrayAsync(cancellationToken);
+
+            return customers?.Length > 0
+                ? Result.Ok(customers.Select(c => c.ToModel()).ToArray())
+                : Result.Fail<Customer[]>(new Error("No customers found in the specified date range."));
+        }
+		catch (Exception ex)
+		{
+            return Result.Fail<Customer[]>(new Error(ex.Message).CausedBy(ex));
+        }
+    }
+}