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

namespace LiteCharms.Features.Orders.Queries.Handlers;

public class GetOrdersQueryHandler(IDbContextFactory<ShopDbContext> contextFactory) : IRequestHandler<GetOrdersQuery, Result<Order[]>>
{
    public async ValueTask<Result<Order[]>> Handle(GetOrdersQuery 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 orders = await context.Orders
                .AsNoTracking()
                .OrderByDescending(o => o.CreatedAt)
                .Where(o => o.CreatedAt >= fromDate && o.CreatedAt <= toDate)
                .Take(request.MaxRecords)
                .ToArrayAsync(cancellationToken);   

            return orders?.Length > 0
                ? Result.Ok(orders.Select(o => o.ToModel()).ToArray())
                : Result.Fail<Order[]>(new Error($"No orders found for the specified date range {request.From} - {request.To}."));
        }
		catch (Exception ex)
		{
            return Result.Fail<Order[]>(new Error(ex.Message).CausedBy(ex));
        }
    }
}