ConstructionWand/src/main/java/thetadev/constructionwand/network/PacketUndoBlocks.java

package thetadev.constructionwand.network;

import net.minecraft.network.PacketBuffer;
import net.minecraft.util.math.BlockPos;
import net.minecraftforge.fml.network.NetworkEvent;
import thetadev.constructionwand.ConstructionWand;

import java.util.HashSet;
import java.util.Set;
import java.util.function.Supplier;

public class PacketUndoBlocks
{
    public HashSet<BlockPos> undoBlocks;

    public PacketUndoBlocks(Set<BlockPos> undoBlocks) {
        this.undoBlocks = new HashSet<>(undoBlocks);
    }

    private PacketUndoBlocks(HashSet<BlockPos> undoBlocks) {
        this.undoBlocks = undoBlocks;
    }

    public static void encode(PacketUndoBlocks msg, PacketBuffer buffer) {
        for(BlockPos pos : msg.undoBlocks) {
            buffer.writeBlockPos(pos);
        }
    }

    public static PacketUndoBlocks decode(PacketBuffer buffer) {
        HashSet<BlockPos> undoBlocks = new HashSet<>();

        while(buffer.isReadable()) {
            undoBlocks.add(buffer.readBlockPos());
        }
        return new PacketUndoBlocks(undoBlocks);
    }

    public static class Handler
    {
        public static void handle(final PacketUndoBlocks msg, final Supplier<NetworkEvent.Context> ctx) {
            if(!ctx.get().getDirection().getReceptionSide().isClient()) return;

            //ConstructionWand.LOGGER.debug("PacketUndoBlocks received, Blocks: " + msg.undoBlocks.size());
            ConstructionWand.instance.renderBlockPreview.undoBlocks = msg.undoBlocks;

            ctx.get().setPacketHandled(true);
        }
    }
}