/*
 * This file ("TileEntityItemViewerHopping.java") is part of the Actually Additions mod for Minecraft.
 * It is created and owned by Ellpeck and distributed
 * under the Actually Additions License to be found at
 * http://ellpeck.de/actaddlicense
 * View the source code at https://github.com/Ellpeck/ActuallyAdditions
 *
 * © 2015-2017 Ellpeck
 */

package de.ellpeck.actuallyadditions.mod.tile;

import de.ellpeck.actuallyadditions.mod.ActuallyAdditions;
import de.ellpeck.actuallyadditions.mod.util.StackUtil;
import de.ellpeck.actuallyadditions.mod.util.WorldUtil;
import de.ellpeck.actuallyadditions.mod.util.compat.SlotlessableItemHandlerWrapper;
import net.minecraft.block.BlockHopper;
import net.minecraft.block.state.IBlockState;
import net.minecraft.entity.item.EntityItem;
import net.minecraft.item.ItemStack;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.EnumFacing;
import net.minecraft.util.math.AxisAlignedBB;
import net.minecraft.util.math.BlockPos;
import net.minecraftforge.items.CapabilityItemHandler;
import net.minecraftforge.items.IItemHandler;
import org.cyclops.commoncapabilities.api.capability.itemhandler.ISlotlessItemHandler;
import org.cyclops.commoncapabilities.capability.itemhandler.SlotlessItemHandlerConfig;

import java.util.List;

public class TileEntityItemViewerHopping extends TileEntityItemViewer{

    private SlotlessableItemHandlerWrapper handlerToPullFrom;
    private SlotlessableItemHandlerWrapper handlerToPushTo;

    public TileEntityItemViewerHopping(){
        super("itemViewerHopping");
    }

    @Override
    public void updateEntity(){
        super.updateEntity();

        if(!this.world.isRemote && this.world.getTotalWorldTime()%10 == 0){
            if(this.handlerToPullFrom != null){
                WorldUtil.doItemInteraction(this.handlerToPullFrom, this.itemHandler, 4);
            }
            else{
                if(this.world.getTotalWorldTime()%20 == 0){
                    List<EntityItem> items = this.world.getEntitiesWithinAABB(EntityItem.class, new AxisAlignedBB(this.pos.getX(), this.pos.getY()+0.5, this.pos.getZ(), this.pos.getX()+1, this.pos.getY()+2, this.pos.getZ()+1));
                    if(items != null && !items.isEmpty()){
                        for(EntityItem item : items){
                            if(item != null && !item.isDead){
                                if(ActuallyAdditions.commonCapsLoaded){
                                    Object slotless = this.itemHandler.getSlotlessHandler();
                                    if(slotless instanceof ISlotlessItemHandler){
                                        ItemStack left = ((ISlotlessItemHandler)slotless).insertItem(item.getEntityItem(), false);
                                        item.setEntityItemStack(left);

                                        if(!StackUtil.isValid(left)){
                                            item.setDead();
                                            continue;
                                        }
                                    }
                                }

                                IItemHandler handler = this.itemHandler.getNormalHandler();
                                if(handler != null){
                                    for(int i = 0; i < handler.getSlots(); i++){
                                        ItemStack left = handler.insertItem(i, item.getEntityItem(), false);
                                        item.setEntityItemStack(left);

                                        if(!StackUtil.isValid(left)){
                                            item.setDead();
                                            break;
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }

            if(this.handlerToPushTo != null){
                WorldUtil.doItemInteraction(this.itemHandler, this.handlerToPushTo, 4);
            }
        }
    }

    @Override
    public void saveDataOnChangeOrWorldStart(){
        super.saveDataOnChangeOrWorldStart();

        this.handlerToPullFrom = null;
        this.handlerToPushTo = null;

        TileEntity from = this.world.getTileEntity(this.pos.offset(EnumFacing.UP));
        if(from != null && !(from instanceof TileEntityItemViewer)){
            IItemHandler normal = null;
            if(from.hasCapability(CapabilityItemHandler.ITEM_HANDLER_CAPABILITY, EnumFacing.DOWN)){
                normal = from.getCapability(CapabilityItemHandler.ITEM_HANDLER_CAPABILITY, EnumFacing.DOWN);
            }

            Object slotless = null;
            if(ActuallyAdditions.commonCapsLoaded){
                if(from.hasCapability(SlotlessItemHandlerConfig.CAPABILITY, EnumFacing.DOWN)){
                    slotless = from.getCapability(SlotlessItemHandlerConfig.CAPABILITY, EnumFacing.DOWN);
                }
            }

            this.handlerToPullFrom = new SlotlessableItemHandlerWrapper(normal, slotless);
        }

        IBlockState state = this.world.getBlockState(this.pos);
        EnumFacing facing = state.getValue(BlockHopper.FACING);

        BlockPos toPos = this.pos.offset(facing);
        if(this.world.isBlockLoaded(toPos)){
            TileEntity to = this.world.getTileEntity(toPos);
            if(to != null && !(to instanceof TileEntityItemViewer)){
                IItemHandler normal = null;
                if(to.hasCapability(CapabilityItemHandler.ITEM_HANDLER_CAPABILITY, facing.getOpposite())){
                    normal = to.getCapability(CapabilityItemHandler.ITEM_HANDLER_CAPABILITY, facing.getOpposite());
                }

                Object slotless = null;
                if(ActuallyAdditions.commonCapsLoaded){
                    if(to.hasCapability(SlotlessItemHandlerConfig.CAPABILITY, facing.getOpposite())){
                        slotless = to.getCapability(SlotlessItemHandlerConfig.CAPABILITY, facing.getOpposite());
                    }
                }

                this.handlerToPushTo = new SlotlessableItemHandlerWrapper(normal, slotless);
            }
        }
    }
}