components/LiteCharms.Features/Refunds/Queries/Handlers/GetCustomerRefundsQueryHandler.cs

using LiteCharms.Extensions;
using LiteCharms.Features.Refunds.Queries;
using LiteCharms.Infrastructure.Database;
using LiteCharms.Models;

namespace LiteCharms.Features.Refunds.Queries.Handlers;

public class GetCustomerRefundsQueryHandler(IDbContextFactory<LeadGeneratorDbContext> contextFactory) : IRequestHandler<GetCustomerRefundsQuery, Result<OrderRefund[]>>
{
    public async ValueTask<Result<OrderRefund[]>> Handle(GetCustomerRefundsQuery request, CancellationToken cancellationToken)
    {
		try
		{
            using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            if(!await context.Customers.AnyAsync(c => c.Id == request.CustomerId, cancellationToken))
                return Result.Fail<OrderRefund[]>(new Error($"Customer with Id {request.CustomerId} does not exist."));

            var refunds = await context.OrderRefunds.AsNoTracking().AsSplitQuery()
                .OrderByDescending(o => o.CreatedAt)
                .Where(r => r.Order!.CustomerId == request.CustomerId).ToArrayAsync(cancellationToken);

            return refunds?.Length > 0 
                ? Result.Ok(refunds.Select(r => r.ToModel()).ToArray()) 
                : Result.Fail<OrderRefund[]>(new Error($"No refunds found for customer with Id {request.CustomerId}."));
        }
		catch (Exception ex)
		{
            return Result.Fail<OrderRefund[]>(new Error(ex.Message).CausedBy(ex));
        }
    }
}