minecraft-kajetans-mod/src/main/java/me/km/items/ItemScroll.java

package me.km.items;

import java.util.List;
import me.km.KajetansMod;
import me.km.api.GlobalText;
import me.km.api.Utils;
import me.km.effects.Effect;
import me.km.effects.EffectCause;
import net.minecraft.client.util.ITooltipFlag;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.entity.player.EntityPlayerMP;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.stats.StatList;
import net.minecraft.util.ActionResult;
import net.minecraft.util.EnumActionResult;
import net.minecraft.util.EnumHand;
import net.minecraft.world.World;
import net.minecraftforge.common.capabilities.ICapabilityProvider;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;

public class ItemScroll extends ItemBase
{
    public ItemScroll(String name, String local) 
    {
        super(name, local);
    }

    @Override
    public ActionResult<ItemStack> onItemRightClick(World w, EntityPlayer p, EnumHand hand) 
    {
        if(w.isRemote || KajetansMod.singlePlayer)
        {
            return new ActionResult(EnumActionResult.SUCCESS, p.getHeldItem(hand));
        }
        
        if(!KajetansMod.worldManager.getWorldPreferences(w).scrolls)
        {
            KajetansMod.scrolls.send(p, GlobalText.noScrolls());
            return new ActionResult(EnumActionResult.FAIL, p.getHeldItem(hand));
        }
        
        ItemStack stack = p.getHeldItem(hand);
        NBTTagCompound com = getTagCompound(stack);
        int id = com.getInteger("effect_id");
        if(id == -1)
        {
            KajetansMod.scrolls.send(p, "Die Schriftrolle hat keinen Effekt.");
            return new ActionResult(EnumActionResult.FAIL, stack);
        }
        Effect eff = Effect.getEffect(id);
        if(eff == null)
        {
            KajetansMod.scrolls.send(p, "Die Schriftrolle ist korrupt.");
            return new ActionResult(EnumActionResult.FAIL, stack);
        }
        if(eff.getEffectInstance().run((EntityPlayerMP) p, com.getInteger("effect_level"), 0, 20, EffectCause.SCROLL))
        {
            if(!p.isCreative())
            {
                stack.shrink(1);
            }
            p.addStat(StatList.getObjectUseStats(this));
            return new ActionResult(EnumActionResult.SUCCESS, stack);
        }
        return new ActionResult(EnumActionResult.FAIL, stack);
    }

    @SideOnly(Side.CLIENT)
    @Override
    public void addInformation(ItemStack stack, World w, List<String> lore, ITooltipFlag flag) 
    {
        NBTTagCompound com = getTagCompound(stack);
        String s = com.getString("effect_name");
        if(!s.isEmpty())
        {
            lore.set(0, s + " " + Utils.intToRoman(com.getInteger("effect_level")));
        }
    }
    
    @Override
    public ICapabilityProvider initCapabilities(ItemStack stack, NBTTagCompound nbt) 
    {
        getTagCompound(stack);
        return null;
    }  
    
    private NBTTagCompound getTagCompound(ItemStack stack)
    {
        NBTTagCompound com = stack.getTagCompound();
        if(com == null)
        {
            com = new NBTTagCompound();
            com.setInteger("effect_id", -1);
            com.setInteger("effect_level", 1);
            com.setString("effect_name", "");
            stack.setTagCompound(com);
        }
        else 
        {
            if(!com.hasKey("effect_id"))
            {
                com.setInteger("effect_id", -1);     
            }
            if(!com.hasKey("effect_level"))
            {
                com.setInteger("effect_level", 1);     
            }
            if(!com.hasKey("effect_name"))
            {
                com.setString("effect_name", "");     
            }
        }
        return com;
    }
    
    public void setEffect(ItemStack stack, int id, int level, String name)
    {
        NBTTagCompound com = getTagCompound(stack);
        com.setInteger("effect_id", id);
        level = Math.max(1, Math.min(20, level));
        com.setInteger("effect_level", level);
        com.setString("effect_name", name);  
    }
}