/*
 * Copyright (c) 2019-2020 GeyserMC. http://geysermc.org
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @author GeyserMC
 * @link https://github.com/GeyserMC/Geyser
 */

package org.geysermc.connector.utils;

import com.github.steveice10.mc.protocol.data.game.chunk.Chunk;
import com.github.steveice10.mc.protocol.data.game.chunk.Column;
import com.github.steveice10.mc.protocol.data.game.entity.metadata.Position;
import com.github.steveice10.mc.protocol.data.game.world.block.BlockState;
import com.nukkitx.math.vector.Vector3i;
import com.nukkitx.protocol.bedrock.packet.LevelChunkPacket;
import com.nukkitx.protocol.bedrock.packet.UpdateBlockPacket;
import org.geysermc.connector.network.session.GeyserSession;
import org.geysermc.connector.network.translators.TranslatorsInit;
import org.geysermc.connector.network.translators.block.BlockTranslator;
import org.geysermc.connector.world.chunk.ChunkSection;

import static org.geysermc.connector.network.translators.block.BlockTranslator.BEDROCK_WATER_ID;

public class ChunkUtils {
    public static ChunkData translateToBedrock(Column column) {
        ChunkData chunkData = new ChunkData();

        Chunk[] chunks = column.getChunks();
        int chunkSectionCount = chunks.length;
        chunkData.sections = new ChunkSection[chunkSectionCount];

        for (int chunkY = 0; chunkY < chunkSectionCount; chunkY++) {
            chunkData.sections[chunkY] = new ChunkSection();
            Chunk chunk = chunks[chunkY];

            if (chunk == null || chunk.isEmpty())
                continue;

            ChunkSection section = chunkData.sections[chunkY];

            for (int x = 0; x < 16; x++) {
                for (int y = 0; y < 16; y++) {
                    for (int z = 0; z < 16; z++) {
                        BlockState blockState = chunk.get(x, y, z);
                        int id = BlockTranslator.getBedrockBlockId(blockState);

                        section.getBlockStorageArray()[0].setFullBlock(ChunkSection.blockPosition(x, y, z), id);

                        if (BlockTranslator.isWaterlogged(blockState)) {
                            section.getBlockStorageArray()[1].setFullBlock(ChunkSection.blockPosition(x, y, z), BEDROCK_WATER_ID);
                        }
                    }
                }
            }
        }
        return chunkData;
    }

    public static void updateBlock(GeyserSession session, BlockState blockState, Position position) {
        Vector3i pos = Vector3i.from(position.getX(), position.getY(), position.getZ());
        updateBlock(session, blockState, pos);
    }

    public static void updateBlock(GeyserSession session, BlockState blockState, Vector3i position) {
        int blockId = BlockTranslator.getBedrockBlockId(blockState);

        UpdateBlockPacket updateBlockPacket = new UpdateBlockPacket();
        updateBlockPacket.setDataLayer(0);
        updateBlockPacket.setBlockPosition(position);
        updateBlockPacket.setRuntimeId(blockId);
        updateBlockPacket.getFlags().add(UpdateBlockPacket.Flag.NEIGHBORS);
        session.getUpstream().sendPacket(updateBlockPacket);

        UpdateBlockPacket waterPacket = new UpdateBlockPacket();
        waterPacket.setDataLayer(1);
        waterPacket.setBlockPosition(position);
        if (BlockTranslator.isWaterlogged(blockState)) {
            waterPacket.setRuntimeId(BEDROCK_WATER_ID);
        } else {
            waterPacket.setRuntimeId(0);
        }
        session.getUpstream().sendPacket(waterPacket);
    }

    public static void sendEmptyChunks(GeyserSession session, Vector3i position, int radius, boolean forceUpdate) {
        int chunkX = position.getX() >> 4;
        int chunkZ = position.getZ() >> 4;
        for (int x = -radius; x <= radius; x++) {
            for (int z = -radius; z <= radius; z++) {
                LevelChunkPacket data = new LevelChunkPacket();
                data.setChunkX(chunkX + x);
                data.setChunkZ(chunkZ + z);
                data.setSubChunksLength(0);
                data.setData(TranslatorsInit.EMPTY_LEVEL_CHUNK_DATA);
                data.setCachingEnabled(false);
                session.getUpstream().sendPacket(data);

                if (forceUpdate) {
                    Vector3i pos = Vector3i.from(chunkX + x << 4, 80, chunkZ + z << 4);
                    UpdateBlockPacket blockPacket = new UpdateBlockPacket();
                    blockPacket.setBlockPosition(pos);
                    blockPacket.setDataLayer(0);
                    blockPacket.setRuntimeId(1);
                    session.getUpstream().sendPacket(blockPacket);
                }
            }
        }
    }

    public static final class ChunkData {
        public ChunkSection[] sections;

        public byte[] blockEntities = new byte[0];
    }
}