/*
 * 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.network.session.cache;

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 lombok.Getter;
import org.geysermc.connector.bootstrap.GeyserBootstrap;
import org.geysermc.connector.network.session.GeyserSession;
import org.geysermc.connector.network.translators.world.block.BlockTranslator;
import org.geysermc.connector.network.translators.world.chunk.ChunkPosition;

import java.util.HashMap;
import java.util.Map;

public class ChunkCache {

    private final boolean cache;

    @Getter
    private final Map<ChunkPosition, Column> chunks = new HashMap<>();

    public ChunkCache(GeyserSession session) {
        if (session.getConnector().getWorldManager().getClass() == GeyserBootstrap.DEFAULT_CHUNK_MANAGER.getClass()) {
            this.cache = session.getConnector().getConfig().isCacheChunks();
        } else {
            this.cache = false; // To prevent Spigot from initializing
        }
    }

    public void addToCache(Column chunk) {
        if (!cache) {
            return;
        }
        ChunkPosition position = new ChunkPosition(chunk.getX(), chunk.getZ());
        if (chunk.getBiomeData() == null && chunks.containsKey(position)) {
            Column newColumn = chunk;
            chunk = chunks.get(position);
            for (int i = 0; i < newColumn.getChunks().length; i++) {
                if (newColumn.getChunks()[i] != null) {
                    chunk.getChunks()[i] = newColumn.getChunks()[i];
                }
            }
        }
        chunks.put(position, chunk);
    }

    public void updateBlock(Position position, int block) {
        if (!cache) {
            return;
        }
        ChunkPosition chunkPosition = new ChunkPosition(position.getX() >> 4, position.getZ() >> 4);
        if (!chunks.containsKey(chunkPosition))
            return;

        Column column = chunks.get(chunkPosition);
        Chunk chunk = column.getChunks()[position.getY() >> 4];
        Position blockPosition = chunkPosition.getChunkBlock(position.getX(), position.getY(), position.getZ());
        if (chunk != null) {
            chunk.set(blockPosition.getX(), blockPosition.getY(), blockPosition.getZ(), block);
        }
    }

    public int getBlockAt(Position position) {
        if (!cache) {
            return BlockTranslator.AIR;
        }
        ChunkPosition chunkPosition = new ChunkPosition(position.getX() >> 4, position.getZ() >> 4);
        if (!chunks.containsKey(chunkPosition))
            return BlockTranslator.AIR;

        Column column = chunks.get(chunkPosition);
        Chunk chunk = column.getChunks()[position.getY() >> 4];
        Position blockPosition = chunkPosition.getChunkBlock(position.getX(), position.getY(), position.getZ());
        if (chunk != null) {
            return chunk.get(blockPosition.getX(), blockPosition.getY(), blockPosition.getZ());
        }

        return BlockTranslator.AIR;
    }

    public void removeChunk(ChunkPosition position) {
        if (!cache) {
            return;
        }
        chunks.remove(position);
    }
}