/*
 * Copyright (c) 2019-2022 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.geyser.level;

import org.cloudburstmc.math.vector.Vector3i;
import org.geysermc.erosion.packet.backendbound.BackendboundBatchBlockRequestPacket;
import org.geysermc.erosion.packet.backendbound.BackendboundBlockRequestPacket;
import org.geysermc.erosion.util.BlockPositionIterator;
import org.geysermc.geyser.erosion.ErosionCancellationException;
import org.geysermc.geyser.session.GeyserSession;
import org.geysermc.mcprotocollib.protocol.data.game.entity.player.GameMode;

import java.util.concurrent.CompletableFuture;

public class GeyserWorldManager extends WorldManager {

    @Override
    public int getBlockAt(GeyserSession session, int x, int y, int z) {
        var erosionHandler = session.getErosionHandler().getAsActive();
        if (erosionHandler == null) {
            return session.getChunkCache().getBlockAt(x, y, z);
        } else if (session.isClosed()) {
            throw new ErosionCancellationException();
        }
        CompletableFuture<Integer> future = new CompletableFuture<>(); // Boxes
        erosionHandler.setPendingLookup(future);
        erosionHandler.sendPacket(new BackendboundBlockRequestPacket(0, Vector3i.from(x, y, z)));
        return future.join();
    }

    @Override
    public CompletableFuture<Integer> getBlockAtAsync(GeyserSession session, int x, int y, int z) {
        var erosionHandler = session.getErosionHandler().getAsActive();
        if (erosionHandler == null) {
            return super.getBlockAtAsync(session, x, y, z);
        } else if (session.isClosed()) {
            return CompletableFuture.failedFuture(new ErosionCancellationException());
        }
        CompletableFuture<Integer> future = new CompletableFuture<>(); // Boxes
        int transactionId = erosionHandler.getNextTransactionId();
        erosionHandler.getAsyncPendingLookups().put(transactionId, future);
        erosionHandler.sendPacket(new BackendboundBlockRequestPacket(transactionId, Vector3i.from(x, y, z)));
        return future;
    }

    @Override
    public int[] getBlocksAt(GeyserSession session, BlockPositionIterator iter) {
        var erosionHandler = session.getErosionHandler().getAsActive();
        if (erosionHandler == null) {
            return super.getBlocksAt(session, iter);
        } else if (session.isClosed()) {
            throw new ErosionCancellationException();
        }
        CompletableFuture<int[]> future = new CompletableFuture<>();
        erosionHandler.setPendingBatchLookup(future);
        erosionHandler.sendPacket(new BackendboundBatchBlockRequestPacket(iter));
        return future.join();
    }

    @Override
    public boolean hasOwnChunkCache() {
        // This implementation can only fetch data from the session chunk cache
        return false;
    }

    @Override
    public GameMode getDefaultGameMode(GeyserSession session) {
        return GameMode.SURVIVAL;
    }
}
