ActuallyAdditions/src/main/java/de/ellpeck/actuallyadditions/mod/items/ItemSpawnerChanger.java

package de.ellpeck.actuallyadditions.mod.items;

import java.util.List;

import de.ellpeck.actuallyadditions.mod.ActuallyAdditions;
import de.ellpeck.actuallyadditions.mod.config.values.ConfigStringListValues;
import de.ellpeck.actuallyadditions.mod.items.base.ItemBase;
import de.ellpeck.actuallyadditions.mod.util.StackUtil;
import de.ellpeck.actuallyadditions.mod.util.StringUtil;
import net.minecraft.block.state.IBlockState;
import net.minecraft.client.util.ITooltipFlag;
import net.minecraft.entity.EntityList;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.tileentity.MobSpawnerBaseLogic;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.tileentity.TileEntityMobSpawner;
import net.minecraft.util.EnumActionResult;
import net.minecraft.util.EnumFacing;
import net.minecraft.util.EnumHand;
import net.minecraft.util.ResourceLocation;
import net.minecraft.util.math.BlockPos;
import net.minecraft.util.text.TextFormatting;
import net.minecraft.world.World;

public class ItemSpawnerChanger extends ItemBase {

    public ItemSpawnerChanger(String name) {
        super(name);
        this.setMaxStackSize(1);
    }

    @Override
    public EnumActionResult onItemUse(EntityPlayer player, World world, BlockPos pos, EnumHand hand, EnumFacing facing, float hitX, float hitY, float hitZ) {
        if (!world.isRemote) {
            ItemStack stack = player.getHeldItemMainhand();
            if (player.canPlayerEdit(pos.offset(facing), facing, stack)) {
                TileEntity tile = world.getTileEntity(pos);
                if (tile instanceof TileEntityMobSpawner) {
                    String entity = this.getStoredEntity(stack);
                    if (entity != null) {
                        MobSpawnerBaseLogic logic = ((TileEntityMobSpawner) tile).getSpawnerBaseLogic();

                        //This is a hacky way to remove the spawn potentials that make the spawner reset from time to time
                        //Don't judge, there isn't a method for it and it's better than Reflection hackiness
                        NBTTagCompound compound = new NBTTagCompound();
                        logic.writeToNBT(compound);
                        compound.removeTag("SpawnPotentials");
                        compound.removeTag("SpawnData");
                        logic.readFromNBT(compound);

                        logic.setEntityId(new ResourceLocation(entity));

                        tile.markDirty();

                        IBlockState state = world.getBlockState(pos);
                        world.notifyBlockUpdate(pos, state, state, 3);

                        ItemPhantomConnector.clearStorage(stack, "Entity");

                        if (!player.capabilities.isCreativeMode) {
                            player.setHeldItem(hand, StackUtil.shrink(stack, 1));
                        }

                        return EnumActionResult.SUCCESS;
                    }
                }
            }
        }
        return EnumActionResult.FAIL;
    }

    @Override
    public boolean itemInteractionForEntity(ItemStack aStack, EntityPlayer player, EntityLivingBase entity, EnumHand hand) {
        if (!player.world.isRemote) {
            ItemStack stack = player.getHeldItemMainhand();
            if (this.getStoredEntity(stack) == null) {
                if (this.storeClickedEntity(stack, entity)) {
                    entity.setDead();
                }
            }
            return true;
        }
        return false;
    }

    private boolean storeClickedEntity(ItemStack stack, EntityLivingBase entity) {
        if (!stack.hasTagCompound()) {
            stack.setTagCompound(new NBTTagCompound());
        }

        if (!(entity instanceof EntityPlayer) && entity.isNonBoss()) {
            ResourceLocation entityLoc = EntityList.getKey(entity.getClass());
            if (entityLoc != null) {
                String entityName = entityLoc.toString();
                if (entityName != null && !entityName.isEmpty()) {
                    for (String name : ConfigStringListValues.SPAWNER_CHANGER_BLACKLIST.getValue()) {
                        if (entityName.equals(name)) { return false; }
                    }

                    stack.getTagCompound().setString("Entity", entityName);
                    return true;
                }
            }
        }
        return false;
    }

    private String getStoredEntity(ItemStack stack) {
        if (stack.hasTagCompound()) {
            String entity = stack.getTagCompound().getString("Entity");
            if (entity != null && !entity.isEmpty()) { return entity; }
        }
        return null;
    }

    @Override
    public void addInformation(ItemStack stack, World playerIn, List<String> list, ITooltipFlag advanced) {
        String entity = this.getStoredEntity(stack);
        if (entity != null) {
            list.add("Entity: " + entity);
            list.add(TextFormatting.ITALIC + StringUtil.localize("tooltip." + ActuallyAdditions.MODID + ".clearStorage.desc"));
        }
    }
}