package net.minecraft.world.item.crafting;

import it.unimi.dsi.fastutil.ints.IntArrayList;
import it.unimi.dsi.fastutil.ints.IntList;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;

public class PlacementInfo {
	public static final int EMPTY_SLOT = -1;
	public static final PlacementInfo NOT_PLACEABLE = new PlacementInfo(List.of(), IntList.of());
	private final List<Ingredient> ingredients;
	private final IntList slotsToIngredientIndex;

	private PlacementInfo(final List<Ingredient> ingredients, final IntList slotsToIngredientIndex) {
		this.ingredients = ingredients;
		this.slotsToIngredientIndex = slotsToIngredientIndex;
	}

	public static PlacementInfo create(final Ingredient ingredient) {
		return ingredient.isEmpty() ? NOT_PLACEABLE : new PlacementInfo(List.of(ingredient), IntList.of(0));
	}

	public static PlacementInfo createFromOptionals(final List<Optional<Ingredient>> ingredients) {
		int ingredientCount = ingredients.size();
		List<Ingredient> presentIngredients = new ArrayList(ingredientCount);
		IntList slotsToIngredientIndex = new IntArrayList(ingredientCount);
		int placementIndex = 0;

		for (Optional<Ingredient> maybeIngredient : ingredients) {
			if (maybeIngredient.isPresent()) {
				Ingredient ingredient = (Ingredient)maybeIngredient.get();
				if (ingredient.isEmpty()) {
					return NOT_PLACEABLE;
				}

				presentIngredients.add(ingredient);
				slotsToIngredientIndex.add(placementIndex++);
			} else {
				slotsToIngredientIndex.add(-1);
			}
		}

		return new PlacementInfo(presentIngredients, slotsToIngredientIndex);
	}

	public static PlacementInfo create(final List<Ingredient> ingredients) {
		int ingredientCount = ingredients.size();
		IntList slotsToIngredientIndex = new IntArrayList(ingredientCount);

		for (int i = 0; i < ingredientCount; i++) {
			Ingredient ingredient = (Ingredient)ingredients.get(i);
			if (ingredient.isEmpty()) {
				return NOT_PLACEABLE;
			}

			slotsToIngredientIndex.add(i);
		}

		return new PlacementInfo(ingredients, slotsToIngredientIndex);
	}

	public IntList slotsToIngredientIndex() {
		return this.slotsToIngredientIndex;
	}

	public List<Ingredient> ingredients() {
		return this.ingredients;
	}

	public boolean isImpossibleToPlace() {
		return this.slotsToIngredientIndex.isEmpty();
	}
}