using LiteCharms.Extensions;
using LiteCharms.Infrastructure.Database;
using LiteCharms.Models;

namespace LiteCharms.Features.Orders.Queries.Handlers;

public class GetCustomerOrdersQueryHandler(IDbContextFactory<ShopDbContext> contextFactory) : IRequestHandler<GetCustomerOrdersQuery, Result<Order[]>>
{
    public async ValueTask<Result<Order[]>> Handle(GetCustomerOrdersQuery request, CancellationToken cancellationToken)
    {
		try
		{
            using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

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

            var orders = await context.Orders.AsNoTracking()
                .OrderByDescending(o => o.CreatedAt)
                .Where(o => o.CustomerId == request.CustomerId)
                .ToArrayAsync(cancellationToken);

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