/*
 * WorldEdit, a Minecraft world manipulation toolkit
 * Copyright (C) sk89q <http://www.sk89q.com>
 * Copyright (C) WorldEdit team and contributors
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser 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 Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

package com.sk89q.worldedit.world;

import com.sk89q.worldedit.BlockVector2D;
import com.sk89q.worldedit.Vector;
import com.sk89q.worldedit.WorldEditException;
import com.sk89q.worldedit.blocks.BaseBlock;
import com.sk89q.worldedit.world.block.BlockState;
import com.sk89q.worldedit.blocks.BaseItem;
import com.sk89q.worldedit.blocks.BaseItemStack;
import com.sk89q.worldedit.extension.platform.Platform;
import com.sk89q.worldedit.function.mask.BlockMask;
import com.sk89q.worldedit.function.mask.BlockTypeMask;
import com.sk89q.worldedit.function.mask.Mask;
import com.sk89q.worldedit.function.operation.Operation;
import com.sk89q.worldedit.util.Direction;
import com.sk89q.worldedit.world.block.BlockStateHolder;
import com.sk89q.worldedit.world.block.BlockState;
import com.sk89q.worldedit.world.block.BlockType;
import com.sk89q.worldedit.world.block.BlockTypes;

import javax.annotation.Nullable;
import java.util.PriorityQueue;

/**
 * An abstract implementation of {@link World}.
 */
public abstract class AbstractWorld implements World {

    private final PriorityQueue<QueuedEffect> effectQueue = new PriorityQueue<>();
    private int taskId = -1;

    @Override
    public boolean useItem(Vector position, BaseItem item, Direction face) {
        return false;
    }

    @Override
    public final boolean setBlock(Vector pt, BlockStateHolder block) throws WorldEditException {
        return setBlock(pt, block, true);
    }

    @Override
    public int getMaxY() {
        return getMaximumPoint().getBlockY();
    }

    @Override
    public Mask createLiquidMask() {
        return new BlockTypeMask(this, BlockTypes.LAVA, BlockTypes.WATER);
    }

    @Override
    public void dropItem(Vector pt, BaseItemStack item, int times) {
        for (int i = 0; i < times; ++i) {
            dropItem(pt, item);
        }
    }

    @Override
    public void checkLoadedChunk(Vector pt) {
    }

    @Override
    public void fixAfterFastMode(Iterable<BlockVector2D> chunks) {
    }

    @Override
    public void fixLighting(Iterable<BlockVector2D> chunks) {
    }

    @Override
    public boolean playEffect(Vector position, int type, int data) {
        return false;
    }

    @Override
    public BlockState getLazyBlock(Vector position) {
        return new BaseBlock(getBlock(position));
    }

    @Override
    public boolean queueBlockBreakEffect(Platform server, Vector position, BlockType blockType, double priority) {
        if (taskId == -1) {
            taskId = server.schedule(0, 1, () -> {
                int max = Math.max(1, Math.min(30, effectQueue.size() / 3));
                for (int i = 0; i < max; ++i) {
                    if (effectQueue.isEmpty()) return;

                    effectQueue.poll().play();
                }
            });
        }

        if (taskId == -1) {
            return false;
        }

        effectQueue.offer(new QueuedEffect(position, blockType, priority));

        return true;
    }

    @Override
    public Vector getMinimumPoint() {
        return new Vector(-30000000, 0, -30000000);
    }

    @Override
    public Vector getMaximumPoint() {
        return new Vector(30000000, 255, 30000000);
    }

    @Override
    public @Nullable Operation commit() {
        return null;
    }

    private class QueuedEffect implements Comparable<QueuedEffect> {
        private final Vector position;
        private final BlockType blockType;
        private final double priority;

        private QueuedEffect(Vector position, BlockType blockType, double priority) {
            this.position = position;
            this.blockType = blockType;
            this.priority = priority;
        }

        public void play() {
            playEffect(position, 2001, blockType.getLegacyCombinedId() >> 4);
        }

        @Override
        public int compareTo(@Nullable QueuedEffect other) {
            return Double.compare(priority, other != null ? other.priority : 0);
        }
    }
}