ActuallyAdditions/src/main/java/de/ellpeck/actuallyadditions/common/items/ItemGrowthRing.java

package de.ellpeck.actuallyadditions.common.items;

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

import de.ellpeck.actuallyadditions.common.items.base.ItemEnergy;
import de.ellpeck.actuallyadditions.common.util.StackUtil;
import net.minecraft.block.Block;
import net.minecraft.block.BlockGrass;
import net.minecraft.block.IGrowable;
import net.minecraft.block.state.IBlockState;
import net.minecraft.entity.Entity;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.item.EnumRarity;
import net.minecraft.item.ItemStack;
import net.minecraft.util.math.BlockPos;
import net.minecraft.util.math.MathHelper;
import net.minecraft.world.World;
import net.minecraftforge.common.IPlantable;

public class ItemGrowthRing extends ItemEnergy {

    public ItemGrowthRing(String name) {
        super(1000000, 2000, name);
    }

    @Override
    public void onUpdate(ItemStack stack, World world, Entity entity, int par4, boolean par5) {
        if (!(entity instanceof EntityPlayer) || world.isRemote || entity.isSneaking()) { return; }

        EntityPlayer player = (EntityPlayer) entity;
        ItemStack equipped = player.getHeldItemMainhand();

        int energyUse = 300;
        if (StackUtil.isValid(equipped) && equipped == stack && this.getEnergyStored(stack) >= energyUse) {
            List<BlockPos> blocks = new ArrayList<>();

            //Adding all possible Blocks
            if (player.world.getTotalWorldTime() % 30 == 0) {
                int range = 3;
                for (int x = -range; x < range + 1; x++) {
                    for (int z = -range; z < range + 1; z++) {
                        for (int y = -range; y < range + 1; y++) {
                            int theX = MathHelper.floor(player.posX + x);
                            int theY = MathHelper.floor(player.posY + y);
                            int theZ = MathHelper.floor(player.posZ + z);
                            BlockPos posInQuestion = new BlockPos(theX, theY, theZ);
                            Block theBlock = world.getBlockState(posInQuestion).getBlock();
                            if ((theBlock instanceof IGrowable || theBlock instanceof IPlantable) && !(theBlock instanceof BlockGrass)) {
                                blocks.add(posInQuestion);
                            }
                        }
                    }
                }

                //Fertilizing the Blocks
                if (!blocks.isEmpty()) {
                    for (int i = 0; i < 45; i++) {
                        if (this.getEnergyStored(stack) >= energyUse) {
                            BlockPos pos = blocks.get(world.rand.nextInt(blocks.size()));

                            IBlockState state = world.getBlockState(pos);
                            Block block = state.getBlock();
                            int metaBefore = block.getMetaFromState(state);
                            block.updateTick(world, pos, world.getBlockState(pos), world.rand);

                            //Show Particles if Metadata changed
                            IBlockState newState = world.getBlockState(pos);
                            if (newState.getBlock().getMetaFromState(newState) != metaBefore) {
                                world.playEvent(2005, pos, 0);
                            }

                            if (!player.capabilities.isCreativeMode) {
                                this.extractEnergyInternal(stack, energyUse, false);
                            }
                        } else {
                            break;
                        }
                    }
                }
            }
        }
    }

    @Override
    public EnumRarity getRarity(ItemStack stack) {
        return EnumRarity.EPIC;
    }
}