namespace DanieleMarotta.RiversongCodeShowcase
{
    [GameSystemGroup(typeof(EconomySystemGroup))]
    public class ProductionRequirementsGameSystem : GameSystem, IUpdatable
    {
        [InjectService]
        private IEntityCache _entityCache;

        public ProductionRequirementsGameSystem(IServiceLocator serviceLocator) : base(serviceLocator)
        {
        }

        public void Update()
        {
            foreach (var producer in _entityCache.GetProducers())
            {
                ref var productionState = ref producer.GetProductionStateRW();
                ref var recipe = ref productionState.Recipe;
                ref var storage = ref producer.GetStorageRW();

                productionState.MetRequirements = ProductionRequirements.All;

                foreach (var (product, amount) in recipe.Inputs)
                    if (storage.AvailableNow(product) < amount)
                    {
                        productionState.MetRequirements &= ~ProductionRequirements.InputsAvailable;
                        break;
                    }
            }
        }
    }
}