NaturesAura/src/main/java/de/ellpeck/naturesaura/blocks/tiles/TileEntityPowderPlacer.java

package de.ellpeck.naturesaura.blocks.tiles;

import de.ellpeck.naturesaura.entities.EntityEffectInhibitor;
import de.ellpeck.naturesaura.items.ModItems;
import net.minecraft.item.ItemStack;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.EntitySelectors;
import net.minecraft.util.EnumFacing;
import net.minecraft.util.math.AxisAlignedBB;
import net.minecraftforge.items.CapabilityItemHandler;
import net.minecraftforge.items.IItemHandler;

import java.util.List;

public class TileEntityPowderPlacer extends TileEntityImpl {

    @Override
    public void onRedstonePulse() {
        List<EntityEffectInhibitor> powders = this.world.getEntitiesWithinAABB(EntityEffectInhibitor.class,
                new AxisAlignedBB(this.pos, this.pos.add(1, 2, 1)), EntitySelectors.IS_ALIVE);
        for (EnumFacing facing : EnumFacing.HORIZONTALS) {
            TileEntity tile = this.world.getTileEntity(this.pos.offset(facing));
            if (tile == null || !tile.hasCapability(CapabilityItemHandler.ITEM_HANDLER_CAPABILITY, facing.getOpposite()))
                continue;
            IItemHandler handler = tile.getCapability(CapabilityItemHandler.ITEM_HANDLER_CAPABILITY, facing.getOpposite());
            if (handler == null)
                continue;

            if (!powders.isEmpty()) {
                for (EntityEffectInhibitor powder : powders) {
                    ItemStack drop = powder.getDrop();
                    for (int i = 0; i < handler.getSlots(); i++) {
                        ItemStack remain = handler.insertItem(i, drop, false);
                        if (remain.isEmpty()) {
                            powder.setDead();
                            break;
                        } else if (remain.getCount() != drop.getCount()) {
                            powder.setAmount(remain.getCount());
                        }
                    }
                }
            } else {
                for (int i = 0; i < handler.getSlots(); i++) {
                    ItemStack stack = handler.extractItem(i, Integer.MAX_VALUE, true);
                    if (stack.isEmpty() || stack.getItem() != ModItems.EFFECT_POWDER)
                        continue;
                    EntityEffectInhibitor.place(this.world, stack, this.pos.getX() + 0.5, this.pos.getY() + 1, this.pos.getZ() + 0.5);
                    handler.extractItem(i, Integer.MAX_VALUE, false);
                    break;
                }
            }
        }
    }
}