ActuallyAdditions/src/main/java/de/ellpeck/actuallyadditions/common/tile/TileEntityFurnaceSolar.java

package de.ellpeck.actuallyadditions.common.tile;

import net.minecraft.block.state.IBlockState;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.EnumFacing;
import net.minecraft.util.math.BlockPos;
import net.minecraftforge.energy.IEnergyStorage;

public class TileEntityFurnaceSolar extends TileEntityBase implements ISharingEnergyProvider, IEnergyDisplay {

    public static final int PRODUCE = 8;
    public final CustomEnergyStorage storage = new CustomEnergyStorage(30000, 0, 100);
    private int oldEnergy;

    public TileEntityFurnaceSolar() {
        super("solarPanel");
    }

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

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

    @Override
    public void updateEntity() {
        super.updateEntity();
        if (!this.world.isRemote) {
            int power = this.getPowerToGenerate(PRODUCE);
            if (this.world.isDaytime() && power > 0) {
                if (power <= this.storage.getMaxEnergyStored() - this.storage.getEnergyStored()) {
                    this.storage.receiveEnergyInternal(power, false);
                    this.markDirty();
                }
            }

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

    public int getPowerToGenerate(int power) {
        for (int y = 1; y <= this.world.getHeight() - this.pos.getY(); y++) {
            if (power > 0) {
                BlockPos pos = this.pos.up(y);
                IBlockState state = this.world.getBlockState(pos);

                if (state.getMaterial().isOpaque()) {
                    power = 0;
                } else if (!state.getBlock().isAir(state, this.world, pos)) {
                    power--;
                }
            } else {
                break;
            }
        }

        return power;
    }

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

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

    @Override
    public int getEnergyToSplitShare() {
        return this.storage.getEnergyStored();
    }

    @Override
    public boolean doesShareEnergy() {
        return true;
    }

    @Override
    public EnumFacing[] getEnergyShareSides() {
        return EnumFacing.values();
    }

    @Override
    public boolean canShareTo(TileEntity tile) {
        return true;
    }

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