RoughlyEnoughItems/src/main/java/me/shedaniel/rei/server/RecipeFinder.java

/*
 * Roughly Enough Items by Danielshe.
 * Licensed under the MIT License.
 */

package me.shedaniel.rei.server;

import com.google.common.collect.Lists;
import it.unimi.dsi.fastutil.ints.*;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.recipe.Ingredient;
import net.minecraft.util.DefaultedList;
import net.minecraft.util.registry.Registry;

import javax.annotation.Nullable;
import java.util.BitSet;
import java.util.Iterator;
import java.util.List;
import java.util.stream.Collectors;

public class RecipeFinder {
    public final Int2IntMap idToAmountMap = new Int2IntOpenHashMap();
    
    public static int getItemId(ItemStack itemStack_1) {
        return Registry.ITEM.getRawId(itemStack_1.getItem());
    }
    
    public static ItemStack getStackFromId(int int_1) {
        return int_1 == 0 ? ItemStack.EMPTY : new ItemStack(Item.byRawId(int_1));
    }
    
    public void addNormalItem(ItemStack itemStack_1) {
        if (!itemStack_1.isDamaged() && !itemStack_1.hasEnchantments() && !itemStack_1.hasCustomName()) {
            this.addItem(itemStack_1);
        }
        
    }
    
    public void addItem(ItemStack itemStack_1) {
        this.addItem(itemStack_1, 64);
    }
    
    public void addItem(ItemStack itemStack_1, int int_1) {
        if (!itemStack_1.isEmpty()) {
            int itemId = getItemId(itemStack_1);
            int itemCount = Math.min(int_1, itemStack_1.getCount());
            this.addItem(itemId, itemCount);
        }
        
    }
    
    private boolean contains(int itemId) {
        return this.idToAmountMap.get(itemId) > 0;
    }
    
    /**
     * Takes an amount from the finder
     *
     * @return the amount taken
     */
    private int take(int itemId, int amount) {
        int mapAmount = this.idToAmountMap.get(itemId);
        if (mapAmount >= amount) {
            this.idToAmountMap.put(itemId, mapAmount - amount);
            return itemId;
        } else {
            return 0;
        }
    }
    
    private void addItem(int itemId, int itemCount) {
        this.idToAmountMap.put(itemId, this.idToAmountMap.get(itemId) + itemCount);
    }
    
    public boolean findRecipe(DefaultedList<Ingredient> ingredients, @Nullable IntList intList_1) {
        return this.findRecipe(ingredients, intList_1, 1);
    }
    
    public boolean findRecipe(DefaultedList<Ingredient> ingredients, @Nullable IntList intList_1, int int_1) {
        return (new RecipeFinder.Filter(ingredients)).find(int_1, intList_1);
    }
    
    public int countRecipeCrafts(DefaultedList<Ingredient> ingredients, @Nullable IntList intList_1) {
        return this.countRecipeCrafts(ingredients, Integer.MAX_VALUE, intList_1);
    }
    
    public int countRecipeCrafts(DefaultedList<Ingredient> ingredients, int int_1, @Nullable IntList intList_1) {
        return (new RecipeFinder.Filter(ingredients)).countCrafts(int_1, intList_1);
    }
    
    public void clear() {
        this.idToAmountMap.clear();
    }
    
    class Filter {
        private final List<Ingredient> ingredients = Lists.newArrayList();
        private final int ingredientCount;
        private final int[] usableIngredientItemIds;
        private final int usableIngredientSize;
        private final BitSet bitSet;
        private final IntList field_7557 = new IntArrayList();
        private final DefaultedList<Ingredient> ingredientsInput;
        
        public Filter(DefaultedList<Ingredient> ingredientsInput) {
            this.ingredientsInput = ingredientsInput;
            this.ingredients.addAll(ingredientsInput.stream().collect(Collectors.toList()));
            this.ingredients.removeIf(Ingredient::isEmpty);
            this.ingredientCount = this.ingredients.size();
            this.usableIngredientItemIds = this.getUsableIngredientItemIds();
            this.usableIngredientSize = this.usableIngredientItemIds.length;
            this.bitSet = new BitSet(this.ingredientCount + this.usableIngredientSize + this.ingredientCount + this.ingredientCount * this.usableIngredientSize);
            
            for (int ingredientIndex = 0; ingredientIndex < this.ingredients.size(); ++ingredientIndex) {
                IntList possibleStacks = ((Ingredient) this.ingredients.get(ingredientIndex)).getIds();
                
                // Loops over usable ingredients
                for (int usableIngredientIndex = 0; usableIngredientIndex < this.usableIngredientSize; ++usableIngredientIndex) {
                    if (possibleStacks.contains(this.usableIngredientItemIds[usableIngredientIndex])) {
                        this.bitSet.set(this.method_7420(true, usableIngredientIndex, ingredientIndex));
                    }
                }
            }
            
        }
        
        public boolean find(int int_1, @Nullable IntList intList_1) {
            if (int_1 <= 0) {
                return true;
            } else {
                int int_2;
                for (int_2 = 0; this.method_7423(int_1); ++int_2) {
                    RecipeFinder.this.take(this.usableIngredientItemIds[this.field_7557.getInt(0)], int_1);
                    int int_3 = this.field_7557.size() - 1;
                    this.method_7421(this.field_7557.getInt(int_3));
                    
                    for (int int_4 = 0; int_4 < int_3; ++int_4) {
                        this.method_7414((int_4 & 1) == 0, this.field_7557.get(int_4), this.field_7557.get(int_4 + 1));
                    }
                    
                    this.field_7557.clear();
                    this.bitSet.clear(0, this.ingredientCount + this.usableIngredientSize);
                }
                
                boolean boolean_1 = int_2 == this.ingredientCount;
                boolean boolean_2 = boolean_1 && intList_1 != null;
                if (boolean_2) {
                    intList_1.clear();
                }
                
                this.bitSet.clear(0, this.ingredientCount + this.usableIngredientSize + this.ingredientCount);
                int int_5 = 0;
                List<Ingredient> list_1 = ingredientsInput.stream().collect(Collectors.toList());
                
                for (int int_6 = 0; int_6 < list_1.size(); ++int_6) {
                    if (boolean_2 && ((Ingredient) list_1.get(int_6)).isEmpty()) {
                        intList_1.add(0);
                    } else {
                        for (int int_7 = 0; int_7 < this.usableIngredientSize; ++int_7) {
                            if (this.method_7425(false, int_5, int_7)) {
                                this.method_7414(true, int_7, int_5);
                                RecipeFinder.this.addItem(this.usableIngredientItemIds[int_7], int_1);
                                if (boolean_2) {
                                    intList_1.add(this.usableIngredientItemIds[int_7]);
                                }
                            }
                        }
                        
                        ++int_5;
                    }
                }
                
                return boolean_1;
            }
        }
        
        private int[] getUsableIngredientItemIds() {
            IntCollection intCollection_1 = new IntAVLTreeSet();
            Iterator var2 = this.ingredients.iterator();
            
            while (var2.hasNext()) {
                Ingredient ingredient_1 = (Ingredient) var2.next();
                intCollection_1.addAll(ingredient_1.getIds());
            }
            
            IntIterator intIterator_1 = intCollection_1.iterator();
            
            while (intIterator_1.hasNext()) {
                if (!RecipeFinder.this.contains(intIterator_1.nextInt())) {
                    intIterator_1.remove();
                }
            }
            
            return intCollection_1.toIntArray();
        }
        
        private boolean method_7423(int int_1) {
            int usableIngredientSize = this.usableIngredientSize;
            
            for (int int_3 = 0; int_3 < usableIngredientSize; ++int_3) {
                if (RecipeFinder.this.idToAmountMap.get(this.usableIngredientItemIds[int_3]) >= int_1) {
                    this.method_7413(false, int_3);
                    
                    while (!this.field_7557.isEmpty()) {
                        int int_4 = this.field_7557.size();
                        boolean boolean_1 = (int_4 & 1) == 1;
                        int int_5 = this.field_7557.getInt(int_4 - 1);
                        if (!boolean_1 && !this.method_7416(int_5)) {
                            break;
                        }
                        
                        int int_6 = boolean_1 ? this.ingredientCount : usableIngredientSize;
                        
                        int int_8;
                        for (int_8 = 0; int_8 < int_6; ++int_8) {
                            if (!this.method_7426(boolean_1, int_8) && this.method_7418(boolean_1, int_5, int_8) && this.method_7425(boolean_1, int_5, int_8)) {
                                this.method_7413(boolean_1, int_8);
                                break;
                            }
                        }
                        
                        int_8 = this.field_7557.size();
                        if (int_8 == int_4) {
                            this.field_7557.removeInt(int_8 - 1);
                        }
                    }
                    
                    if (!this.field_7557.isEmpty()) {
                        return true;
                    }
                }
            }
            
            return false;
        }
        
        private boolean method_7416(int int_1) {
            return this.bitSet.get(this.method_7419(int_1));
        }
        
        private void method_7421(int int_1) {
            this.bitSet.set(this.method_7419(int_1));
        }
        
        private int method_7419(int int_1) {
            return this.ingredientCount + this.usableIngredientSize + int_1;
        }
        
        private boolean method_7418(boolean boolean_1, int int_1, int int_2) {
            return this.bitSet.get(this.method_7420(boolean_1, int_1, int_2));
        }
        
        private boolean method_7425(boolean boolean_1, int int_1, int int_2) {
            return boolean_1 != this.bitSet.get(1 + this.method_7420(boolean_1, int_1, int_2));
        }
        
        private void method_7414(boolean boolean_1, int int_1, int int_2) {
            this.bitSet.flip(1 + this.method_7420(boolean_1, int_1, int_2));
        }
        
        private int method_7420(boolean boolean_1, int int_1, int int_2) {
            int int_3 = boolean_1 ? int_1 * this.ingredientCount + int_2 : int_2 * this.ingredientCount + int_1;
            return this.ingredientCount + this.usableIngredientSize + this.ingredientCount + 2 * int_3;
        }
        
        private void method_7413(boolean boolean_1, int int_1) {
            this.bitSet.set(this.method_7424(boolean_1, int_1));
            this.field_7557.add(int_1);
        }
        
        private boolean method_7426(boolean boolean_1, int int_1) {
            return this.bitSet.get(this.method_7424(boolean_1, int_1));
        }
        
        private int method_7424(boolean boolean_1, int int_1) {
            return (boolean_1 ? 0 : this.ingredientCount) + int_1;
        }
        
        public int countCrafts(int int_1, @Nullable IntList intList_1) {
            int int_2 = 0;
            int int_3 = Math.min(int_1, this.method_7415()) + 1;
            
            while (true) {
                while (true) {
                    int int_4 = (int_2 + int_3) / 2;
                    if (this.find(int_4, (IntList) null)) {
                        if (int_3 - int_2 <= 1) {
                            if (int_4 > 0) {
                                this.find(int_4, intList_1);
                            }
                            
                            return int_4;
                        }
                        
                        int_2 = int_4;
                    } else {
                        int_3 = int_4;
                    }
                }
            }
        }
        
        private int method_7415() {
            int int_1 = Integer.MAX_VALUE;
            Iterator var2 = this.ingredients.iterator();
            
            while (var2.hasNext()) {
                Ingredient ingredient_1 = (Ingredient) var2.next();
                int int_2 = 0;
                
                int int_3;
                for (IntListIterator var5 = ingredient_1.getIds().iterator(); var5.hasNext(); int_2 = Math.max(int_2, RecipeFinder.this.idToAmountMap.get(int_3))) {
                    int_3 = (Integer) var5.next();
                }
                
                if (int_1 > 0) {
                    int_1 = Math.min(int_1, int_2);
                }
            }
            
            return int_1;
        }
    }
}