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package cn.nukkit.inventory;

import cn.nukkit.item.Item;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.UUID;

import static cn.nukkit.inventory.Recipe.matchItemList;

/**
 * @author MagicDroidX (Nukkit Project)
 */
public class ShapelessRecipe implements CraftingRecipe {

    private String recipeId;

    private final Item output;

    private long least,most;

    private final List ingredients;
    private final List ingredientsAggregate;

    private final int priority;

    public ShapelessRecipe(Item result, Collection ingredients) {
        this(null, 10, result, ingredients);
    }

    public ShapelessRecipe(String recipeId, int priority, Item result, Collection ingredients) {
        this.recipeId = recipeId;
        this.priority = priority;
        this.output = result.clone();
        if (ingredients.size() > 9) {
            throw new IllegalArgumentException("Shapeless recipes cannot have more than 9 ingredients");
        }

        this.ingredients = new ArrayList<>();
        this.ingredientsAggregate = new ArrayList<>();

        for (Item item : ingredients) {
            if (item.getCount() < 1) {
                throw new IllegalArgumentException("Recipe '" + recipeId + "' Ingredient amount was not 1 (value: " + item.getCount() + ")");
            }
            boolean found = false;
            for (Item existingIngredient : this.ingredientsAggregate) {
                if (existingIngredient.equals(item, item.hasMeta(), item.hasCompoundTag())) {
                    existingIngredient.setCount(existingIngredient.getCount() + item.getCount());
                    found = true;
                    break;
                }
            }
            if (!found)
                this.ingredientsAggregate.add(item.clone());
            this.ingredients.add(item.clone());
        }

        this.ingredientsAggregate.sort(CraftingManager.recipeComparator);
    }

    @Override
    public Item getResult() {
        return this.output.clone();
    }

    @Override
    public String getRecipeId() {
        return this.recipeId;
    }

    @Override
    public UUID getId() {
        return new UUID(least, most);
    }

    @Override
    public void setId(UUID uuid) {
        this.least = uuid.getLeastSignificantBits();
        this.most = uuid.getMostSignificantBits();

        if (this.recipeId == null) {
            this.recipeId = this.getId().toString();
        }
    }

    public List getIngredientList() {
        List ingredients = new ArrayList<>();
        for (Item ingredient : this.ingredients) {
            ingredients.add(ingredient.clone());
        }

        return ingredients;
    }

    public int getIngredientCount() {
        return ingredients.size();
    }

    @Override
    public void registerToCraftingManager(CraftingManager manager) {
        manager.registerShapelessRecipe(this);
    }

    @Override
    public RecipeType getType() {
        return RecipeType.SHAPELESS;
    }

    @Override
    public boolean requiresCraftingTable() {
        return this.ingredients.size() > 4;
    }

    @Override
    public List getExtraResults() {
        return new ArrayList<>();
    }

    @Override
    public List getAllResults() {
        return null;
    }

    @Override
    public int getPriority() {
        return this.priority;
    }

    @Override
    public boolean matchItems(List inputList, List extraOutputList, int multiplier) {
        List haveInputs = new ArrayList<>();
        for (Item item : inputList) {
            if (item.isNull())
                continue;
            haveInputs.add(item.clone());
        }
        List needInputs = new ArrayList<>();
        if(multiplier != 1){
            for (Item item : ingredientsAggregate) {
                if (item.isNull())
                    continue;
                Item itemClone = item.clone();
                itemClone.setCount(itemClone.getCount() * multiplier);
                needInputs.add(itemClone);
            }
        } else {
            for (Item item : ingredientsAggregate) {
                if (item.isNull())
                    continue;
                needInputs.add(item.clone());
            }
        }

        if (!matchItemList(haveInputs, needInputs)) {
            return false;
        }

        List haveOutputs = new ArrayList<>();
        for (Item item : extraOutputList) {
            if (item.isNull())
                continue;
            haveOutputs.add(item.clone());
        }
        haveOutputs.sort(CraftingManager.recipeComparator);
        List needOutputs = new ArrayList<>();
        if(multiplier != 1){
            for (Item item : getExtraResults()) {
                if (item.isNull())
                    continue;
                Item itemClone = item.clone();
                itemClone.setCount(itemClone.getCount() * multiplier);
                needOutputs.add(itemClone);
            }
        } else {
            for (Item item : getExtraResults()) {
                if (item.isNull())
                    continue;
                needOutputs.add(item.clone());
            }
        }
        needOutputs.sort(CraftingManager.recipeComparator);

        return matchItemList(haveOutputs, needOutputs);
    }

    /**
     * Returns whether the specified list of crafting grid inputs and outputs matches this recipe. Outputs DO NOT
     * include the primary result item.
     *
     * @param inputList  list of items taken from the crafting grid
     * @param extraOutputList list of items put back into the crafting grid (secondary results)
     * @return bool
     */
    @Override
    public boolean matchItems(List inputList, List extraOutputList) {
        return matchItems(inputList, extraOutputList, 1);
    }

    @Override
    public List getIngredientsAggregate() {
        return ingredientsAggregate;
    }
}