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

namespace LiteCharms.Features.Products.Queries.Handlers;

public class GetProductPriceQueryHandler(IDbContextFactory<LeadGeneratorDbContext> contextFactory) : IRequestHandler<GetProductPriceQuery, Result<ProductPrice>>
{
    public async ValueTask<Result<ProductPrice>> Handle(GetProductPriceQuery request, CancellationToken cancellationToken)
    {
		try
		{
            using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            var productPrice = await context.ProductPrices.AsNoTracking()
                .Where(pp => pp.ProductId == request.ProductId && pp.Active)
                .OrderByDescending(pp => pp.CreatedAt)
                .FirstOrDefaultAsync(cancellationToken);

            return productPrice is not null 
                ? Result.Ok(productPrice.ToModel())
                : Result.Fail<ProductPrice>(new Error($"Product price {request.ProductId} not found."));
        }
        catch (Exception ex)
		{
            return Result.Fail<ProductPrice>(new Error(ex.Message).CausedBy(ex));
        }
    }
}