minecraft-kajetans-core-mod/src/main/java/me/kcm/events/Hooks.java

package me.kcm.events;

import java.lang.reflect.Field;
import me.kcm.command.ModServerCommandManager;
import net.minecraft.block.Block;
import net.minecraft.entity.Entity;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.entity.player.EntityPlayerMP;
import net.minecraft.inventory.Container;
import net.minecraft.inventory.ContainerPlayer;
import net.minecraft.inventory.ContainerWorkbench;
import net.minecraft.inventory.InventoryCrafting;
import net.minecraft.item.crafting.CraftingManager;
import net.minecraft.item.crafting.IRecipe;
import net.minecraft.server.MinecraftServer;
import net.minecraft.util.math.BlockPos;
import net.minecraft.util.text.ITextComponent;
import net.minecraft.world.World;
import net.minecraftforge.common.MinecraftForge;
import net.minecraftforge.fml.relauncher.ReflectionHelper;

public class Hooks 
{
    /*public static void onDamageCalculation(EntityLivingBase liv, DamageSource ds, float damage)
    {
        if(!liv.isEntityInvulnerable(ds))
        {
            MinecraftForge.EVENT_BUS.post(new LivingDamageCalculationEvent(liv, ds, damage));
        }
    }*/
    
    public static ITextComponent onGetTabListDisplayName(EntityPlayerMP p)
    {
        PlayerTabListNameEvent e = new PlayerTabListNameEvent(p);
        MinecraftForge.EVENT_BUS.post(e);
        return e.getName();
    }
    
    public static boolean onEntityCanTrample(Entity ent, World w, Block b, BlockPos pos, float fallDistance)
    {
        return !MinecraftForge.EVENT_BUS.post(new FarmlandTrampleEvent(w, pos, w.getBlockState(pos), fallDistance, ent));
    }
    
    public static void onPlayerConnection(EntityPlayerMP p)
    {
        MinecraftForge.EVENT_BUS.post(new PlayerConnectionEvent(p));
    }
    
    public static void onPlayerPreRespawn(EntityPlayerMP p, int dimension, boolean conqueredEnd)
    {
        MinecraftForge.EVENT_BUS.post(new PlayerPreRespawnEvent(p));
    }
    
    public static ModServerCommandManager onCreateCommandManager(MinecraftServer server)
    {
        return new ModServerCommandManager(server);
    }
    
    public static IRecipe onfindMatchingRecipe(InventoryCrafting craftMatrix, World w)
    {
        for(IRecipe irecipe : CraftingManager.REGISTRY)
        {
            if(irecipe.matches(craftMatrix, w))
            {
                Container c = getContainerEventHandler(craftMatrix);
                EntityPlayer p;
                if(c == null)
                {
                    return null;
                }
                else if(c instanceof ContainerPlayer)
                {
                    p = getContainerPlayer((ContainerPlayer) c);
                }
                else if(c instanceof ContainerWorkbench)
                {
                    p = getContainerEventHandler((ContainerWorkbench) c);
                }
                else
                {
                    return null;
                }
                System.out.println(p);
                RecipeChosenEvent e = new RecipeChosenEvent(p, irecipe);
                if(MinecraftForge.EVENT_BUS.post(e))
                {
                    return null;
                }
                return e.getRecipe();
            }
        }
        return null;
    }
    
    private static Field getField(Class c, String... field)
    {
        try
        {
            return ReflectionHelper.findField(c, field);
        }
        catch(SecurityException | ReflectionHelper.UnableToFindFieldException ex)
        {
            System.out.println(String.join(", ", field) + " - " + ex);
        }
        return null;
    }
    
    private static <T> T getFieldValue(Class<T> cast, Object o, Field f)
    {
        try
        {
            return (T) f.get(o);
        }
        catch(SecurityException | IllegalAccessException | IllegalArgumentException ex)
        {
            System.out.println(f + " - " + ex);
            return null;
        }
    }
    
    private final static Field CONTAINER_EVENT_HANDLER = getField(InventoryCrafting.class, "field_70465_c", "eventHandler");
    
    public static Container getContainerEventHandler(InventoryCrafting craftMatrix)
    {
        return getFieldValue(Container.class, craftMatrix, CONTAINER_EVENT_HANDLER);
    }
    
    private final static Field CONTAINER_PLAYER = getField(ContainerPlayer.class, "field_82862_h", "player");
    
    public static EntityPlayer getContainerPlayer(ContainerPlayer cp)
    {
        return getFieldValue(EntityPlayer.class, cp, CONTAINER_PLAYER);
    }
    
    private final static Field CONTAINER_WORKBENCH = getField(ContainerWorkbench.class, "field_192390_i", "player");
    
    public static EntityPlayer getContainerEventHandler(ContainerWorkbench cw)
    {
        return getFieldValue(EntityPlayer.class, cw, CONTAINER_WORKBENCH);
    }
}