/*
    This file is a part of the SteamWar software.

    Copyright (C) 2021  SteamWar.de-Serverteam

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

package de.steamwar.fightsystem.utils;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.UnpooledByteBufAllocator;
import org.bukkit.Bukkit;

import java.util.Set;
import java.util.function.BiFunction;
import java.util.logging.Level;

public class TechHider9 implements BiFunction<byte[], Integer, byte[]> {

    private final Set<Integer> hiddenBlockIds = BlockIdWrapper.impl.getHiddenBlockIds();
    private final int obfuscateWith = BlockIdWrapper.impl.getObfuscateWith();

    @Override
    public byte[] apply(byte[] data, Integer primaryBitMask) {
        ByteBuf buffer = UnpooledByteBufAllocator.DEFAULT.directBuffer(data.length + 100);
        int i = 0;

        while(i < data.length){
            byte bitsPerBlock = data[i++];
            buffer.writeByte(bitsPerBlock);

            if(bitsPerBlock != 13){
                int paletteLength = TechHider.readVarInt(data, i);
                int paletteLengthLength = TechHider.readVarIntLength(data, i);
                buffer.writeBytes(data, i, paletteLengthLength);
                i += paletteLengthLength;

                for(int actPaletteId = 0; actPaletteId < paletteLength; actPaletteId++){
                    int entry = TechHider.readVarInt(data, i);
                    i += TechHider.readVarIntLength(data, i);

                    if(hiddenBlockIds.contains(entry)){
                        entry = obfuscateWith;
                    }
                    buffer.writeBytes(TechHider.writeVarInt(entry));
                }
            }else{
                buffer.writeByte(data[++i]); //Empty palette
                Bukkit.getLogger().log(Level.SEVERE, "Full chunk occured");
            }

            int dataArrayLength = TechHider.readVarInt(data, i);
            int dataArrayLengthLength = TechHider.readVarIntLength(data, i);
            buffer.writeBytes(data, i, dataArrayLength*8 + dataArrayLengthLength);
            i += dataArrayLengthLength;
            i += dataArrayLength * 8;

            buffer.writeBytes(data, i, 4096);
            i += 4096; //Skylight (Not in Nether/End!!!) 2048 + Blocklight 2048
        }

        data = new byte[buffer.readableBytes()];
        buffer.readBytes(data);
        return data;
    }
}