using MyWarehouse.Application.Common.Dependencies.DataAccess;
using MyWarehouse.Application.Common.Exceptions;
using MyWarehouse.Domain.Products;

namespace MyWarehouse.Application.Products.UpdateProduct;

public record UpdateProductCommand : IRequest
{
    public int Id { get; init; }

    public string Name { get; init; } = null!;
    public string Description { get; init; } = null!;

    public float MassValue { get; init; }
    public decimal PriceAmount { get; init; }
}

public class UpdateProductCommandHandler : IRequestHandler<UpdateProductCommand>
{
    private readonly IUnitOfWork _unitOfWork;

    public UpdateProductCommandHandler(IUnitOfWork unitOfWork) => _unitOfWork = unitOfWork;

    public async Task<Unit> Handle(UpdateProductCommand request, CancellationToken cancellationToken)
    {
        var product = await _unitOfWork.Products.GetByIdAsync(request.Id)
            ?? throw new EntityNotFoundException(nameof(Product), request.Id);

        product.UpdateName(request.Name.Trim());
        product.UpdateDescription(request.Description.Trim());
        product.UpdateMass(request.MassValue);
        product.UpdatePrice(request.PriceAmount);

        await _unitOfWork.SaveChanges();

        return Unit.Value;
    }
}