ActuallyAdditions/src/main/java/de/ellpeck/actuallyadditions/common/misc/apiimpl/farmer/CactusFarmerBehavior.java

package de.ellpeck.actuallyadditions.common.misc.apiimpl.farmer;

import de.ellpeck.actuallyadditions.api.farmer.FarmerResult;
import de.ellpeck.actuallyadditions.api.farmer.IFarmerBehavior;
import de.ellpeck.actuallyadditions.api.internal.IFarmer;
import net.minecraft.block.Block;
import net.minecraft.block.BlockCactus;
import net.minecraft.block.state.IBlockState;
import net.minecraft.item.Item;
import net.minecraft.item.ItemBlock;
import net.minecraft.item.ItemStack;
import net.minecraft.util.NonNullList;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.World;

public class CactusFarmerBehavior implements IFarmerBehavior {

    @Override
    public FarmerResult tryPlantSeed(ItemStack seed, World world, BlockPos pos, IFarmer farmer) {
        int use = 250;
        if (farmer.getEnergy() >= use) {
            Item item = seed.getItem();
            if (item instanceof ItemBlock) {
                Block block = Block.getBlockFromItem(item);
                if (block instanceof BlockCactus) {
                    if (block.canPlaceBlockAt(world, pos)) {
                        IBlockState state = block.getDefaultState();
                        world.setBlockState(pos, state, 2);
                        world.playEvent(2001, pos, Block.getStateId(state));

                        farmer.extractEnergy(use);
                        return FarmerResult.SUCCESS;
                    }
                    return FarmerResult.FAIL;
                }
            }
        }
        return FarmerResult.FAIL;
    }

    @Override
    public FarmerResult tryHarvestPlant(World world, BlockPos pos, IFarmer farmer) {
        int use = 250;
        if (farmer.getEnergy() >= use) {
            IBlockState state = world.getBlockState(pos);
            if (state.getBlock() instanceof BlockCactus) {
                FarmerResult result = FarmerResult.STOP_PROCESSING;

                for (int i = 2; i >= 1; i--) {
                    if (farmer.getEnergy() >= use) {
                        BlockPos up = pos.up(i);
                        IBlockState upState = world.getBlockState(up);
                        if (upState.getBlock() instanceof BlockCactus) {
                            NonNullList<ItemStack> drops = NonNullList.create();
                            upState.getBlock().getDrops(drops, world, up, upState, 0);

                            if (!drops.isEmpty()) {
                                if (farmer.canAddToOutput(drops)) {
                                    world.playEvent(2001, up, Block.getStateId(upState));
                                    world.setBlockToAir(up);

                                    farmer.extractEnergy(use);
                                    farmer.addToOutput(drops);

                                    result = FarmerResult.SUCCESS;
                                }
                            }
                        }
                    }
                }
                return result;
            }
        }
        return FarmerResult.FAIL;
    }

    @Override
    public int getPriority() {
        return 4;
    }
}