ActuallyAdditions/src/main/java/de/ellpeck/actuallyadditions/mod/tile/TileEntityPlayerInterface.java

package de.ellpeck.actuallyadditions.mod.tile;

import java.util.UUID;

import de.ellpeck.actuallyadditions.mod.util.StackUtil;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.util.EnumFacing;
import net.minecraftforge.energy.CapabilityEnergy;
import net.minecraftforge.energy.IEnergyStorage;
import net.minecraftforge.items.IItemHandler;
import net.minecraftforge.items.wrapper.PlayerInvWrapper;

public class TileEntityPlayerInterface extends TileEntityBase implements IEnergyDisplay {

    public static final int DEFAULT_RANGE = 32;
    private final CustomEnergyStorage storage = new CustomEnergyStorage(30000, 50, 0);
    public UUID connectedPlayer;
    public String playerName;
    private IItemHandler playerHandler;
    private EntityPlayer oldPlayer;
    private int oldEnergy;
    private int range;

    public TileEntityPlayerInterface() {
        super("playerInterface");
    }

    private EntityPlayer getPlayer() {
        if (this.connectedPlayer != null) {
            EntityPlayer player = this.world.getPlayerEntityByUUID(this.connectedPlayer);
            if (player != null) {
                if (player.getDistance(this.pos.getX(), this.pos.getY(), this.pos.getZ()) <= this.range) { return player; }
            }
        }
        return null;
    }

    @Override
    public IItemHandler getItemHandler(EnumFacing facing) {
        EntityPlayer player = this.getPlayer();

        if (this.oldPlayer != player) {
            this.oldPlayer = player;

            this.playerHandler = player == null ? null : new PlayerInvWrapper(player.inventory);
        }

        return this.playerHandler;
    }

    @Override
    public void updateEntity() {
        super.updateEntity();
        if (!this.world.isRemote) {
            boolean changed = false;

            this.range = TileEntityPhantomface.upgradeRange(DEFAULT_RANGE, this.world, this.pos);

            EntityPlayer player = this.getPlayer();
            if (player != null) {
                for (int i = 0; i < player.inventory.getSizeInventory(); i++) {
                    if (this.storage.getEnergyStored() > 0) {
                        ItemStack slot = player.inventory.getStackInSlot(i);
                        if (StackUtil.isValid(slot) && slot.getCount() == 1) {

                            int received = 0;
                            if (slot.hasCapability(CapabilityEnergy.ENERGY, null)) {
                                IEnergyStorage cap = slot.getCapability(CapabilityEnergy.ENERGY, null);
                                if (cap != null) {
                                    received = cap.receiveEnergy(this.storage.getEnergyStored(), false);
                                }
                            }

                            if (received > 0) {
                                this.storage.extractEnergyInternal(received, false);
                            }
                        }
                    } else {
                        break;
                    }
                }
            }

            if (changed) {
                this.markDirty();
                this.sendUpdate();
            }

            if (this.storage.getEnergyStored() != this.oldEnergy && this.sendUpdateWithInterval()) {
                this.oldEnergy = this.storage.getEnergyStored();
            }
        }
    }

    @Override
    public void writeSyncableNBT(NBTTagCompound compound, NBTType type) {
        super.writeSyncableNBT(compound, type);

        this.storage.writeToNBT(compound);
        if (this.connectedPlayer != null && type != NBTType.SAVE_BLOCK) {
            compound.setUniqueId("Player", this.connectedPlayer);
            compound.setString("PlayerName", this.playerName);
        }
    }

    @Override
    public void readSyncableNBT(NBTTagCompound compound, NBTType type) {
        super.readSyncableNBT(compound, type);

        this.storage.readFromNBT(compound);
        if (compound.hasKey("PlayerLeast") && type != NBTType.SAVE_BLOCK) {
            this.connectedPlayer = compound.getUniqueId("Player");
            this.playerName = compound.getString("PlayerName");
        }
    }

    @Override
    public CustomEnergyStorage getEnergyStorage() {
        return this.storage;
    }

    @Override
    public boolean needsHoldShift() {
        return false;
    }

    @Override
    public IEnergyStorage getEnergyStorage(EnumFacing facing) {
        return this.storage;
    }
}