FlexibleRecipe.java

/**
 * Copyright (c) 2011-2014, SpaceToad and the BuildCraft Team
 * http://www.mod-buildcraft.com
 *
 * BuildCraft is distributed under the terms of the Minecraft Mod Public
 * License 1.0, or MMPL. Please check the contents of the license located in
 * http://www.mod-buildcraft.com/MMPL-1.0.txt
 */
package buildcraft.core.recipes;

import java.util.ArrayList;
import java.util.List;

import net.minecraft.block.Block;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;

import net.minecraftforge.fluids.FluidStack;

import buildcraft.api.recipes.CraftingResult;
import buildcraft.api.recipes.IFlexibleCrafter;
import buildcraft.api.recipes.IFlexibleRecipe;
import buildcraft.core.inventory.StackHelper;
import buildcraft.core.inventory.filters.ArrayStackFilter;
import buildcraft.core.inventory.filters.IStackFilter;

public class FlexibleRecipe<T> implements IFlexibleRecipe<T> {
	public double energyCost = 0;
	public long craftingTime = 0;
	public String id;

	public T output = null;

	public ArrayList<ItemStack> inputItems = new ArrayList<ItemStack>();
	public ArrayList<List<ItemStack>> inputItemsWithAlternatives = new ArrayList<List<ItemStack>>();

	public ArrayList<FluidStack> inputFluids = new ArrayList<FluidStack>();

	public FlexibleRecipe() {

	}

	public FlexibleRecipe(String id, T output, double iEnergyCost, long craftingTime, Object... input) {
		setContents(id, output, iEnergyCost, craftingTime, input);
	}

	public void setContents(String iid, Object ioutput, double iEnergyCost, long iCraftingTime, Object... input) {
		id = iid;

		if (ioutput instanceof ItemStack) {
			output = (T) ioutput;
		} else if (ioutput instanceof Item) {
			output = (T) new ItemStack((Item) ioutput);
		} else if (ioutput instanceof Block) {
			output = (T) new ItemStack((Block) ioutput);
		} else if (ioutput instanceof FluidStack) {
			output = (T) ioutput;
		} else {
			throw new IllegalArgumentException("Unknown Object passed to recipe!");
		}

		energyCost = iEnergyCost;
		craftingTime = iCraftingTime;

		for (Object i : input) {
			if (i instanceof ItemStack) {
				inputItems.add((ItemStack) i);
			} else if (i instanceof Item) {
				inputItems.add(new ItemStack((Item) i));
			} else if (i instanceof Block) {
				inputItems.add(new ItemStack((Block) i));
			} else if (i instanceof FluidStack) {
				inputFluids.add((FluidStack) i);
			} else if (i instanceof List) {
				inputItemsWithAlternatives.add((List) i);
			} else {
				throw new IllegalArgumentException("Unknown Object passed to recipe (" + i.getClass() + ")");
			}
		}
	}


	@Override
	public boolean canBeCrafted(IFlexibleCrafter crafter) {
		return craft(crafter, true) != null;
	}

	@Override
	public CraftingResult<T> craft(IFlexibleCrafter crafter, boolean preview) {
		if (output == null) {
			return null;
		}

		CraftingResult<T> result = new CraftingResult<T>();

		result.recipe = this;
		result.energyCost = energyCost;
		result.craftingTime = craftingTime;

		for (ItemStack requirement : inputItems) {
			IStackFilter filter = new ArrayStackFilter(requirement);
			int amount = requirement.stackSize;

			if (consumeItems(crafter, result, filter, amount, preview) != 0) {
				return null;
			}
		}

		// Item stacks with alternatives consumption

		for (List<ItemStack> requirements : inputItemsWithAlternatives) {
			IStackFilter filter = new ArrayStackFilter(requirements.toArray(new ItemStack[0]));
			int amount = requirements.get(0).stackSize;

			if (consumeItems(crafter, result, filter, amount, preview) != 0) {
				return null;
			}
		}

		// Fluid stacks consumption

		for (FluidStack requirement : inputFluids) {
			int amount = requirement.amount;

			for (int tankid = 0; tankid < crafter.getCraftingFluidStackSize(); tankid++) {
				FluidStack fluid = crafter.getCraftingFluidStack(tankid);

				if (fluid != null && fluid.isFluidEqual(requirement)) {
					int amountUsed = 0;

					if (fluid.amount > amount) {
						amountUsed = amount;

						if (!preview) {
							crafter.decrCraftingFluidStack(tankid, amount);
						}

						amount = 0;
					} else {
						amountUsed = fluid.amount;

						if (!preview) {
							crafter.decrCraftingFluidStack(tankid, fluid.amount);
						}

						amount -= fluid.amount;
					}

					result.usedFluids.add(new FluidStack(requirement.fluidID, amountUsed));
				}

				if (amount == 0) {
					break;
				}
			}

			if (amount != 0) {
				return null;
			}
		}

		// Output generation

		result.crafted = output;

		return result;
	}

	@Override
	public String getId() {
		return id;
	}

	private int consumeItems(IFlexibleCrafter crafter, CraftingResult<T> result, IStackFilter filter,
			int amount, boolean preview) {
		int expected = amount;

		for (int slotid = 0; slotid < crafter.getCraftingItemStackSize(); ++slotid) {
			ItemStack stack = crafter.getCraftingItemStack(slotid);

			if (stack != null && filter.matches(stack)) {
				ItemStack removed = null;

				if (stack.stackSize >= expected) {
					if (preview) {
						removed = stack.copy();
						removed.stackSize = expected;
					} else {
						removed = crafter.decrCraftingItemgStack(slotid, expected);
					}

					expected = 0;
				} else {
					if (preview) {
						removed = stack.copy();
					} else {
						removed = crafter.decrCraftingItemgStack(slotid, stack.stackSize);
					}

					expected -= removed.stackSize;
				}

				result.usedItems.add(removed);
			}

			if (expected == 0) {
				return 0;
			}
		}

		return amount;
	}

	@Override
	public CraftingResult<T> canCraft(ItemStack expectedOutput) {
		if (output instanceof ItemStack
				&& StackHelper.isMatchingItem(expectedOutput, (ItemStack) output)) {
			CraftingResult<T> result = new CraftingResult<T>();

			result.recipe = this;
			result.usedFluids = inputFluids;
			result.usedItems = inputItems;
			result.crafted = output;

			return result;
		} else {
			return null;
		}
	}
}