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

package com.sk89q.worldedit.world;

import com.fastasyncworldedit.core.beta.IChunkGet;
import com.fastasyncworldedit.core.beta.implementation.blocks.NullChunkGet;
import com.fastasyncworldedit.core.beta.implementation.packet.ChunkPacket;
import com.google.common.collect.ImmutableSet;
import com.sk89q.jnbt.CompoundTag;
import com.sk89q.worldedit.EditSession;
import com.sk89q.worldedit.MaxChangedBlocksException;
import com.sk89q.worldedit.WorldEditException;
import com.sk89q.worldedit.blocks.BaseItemStack;
import com.sk89q.worldedit.entity.BaseEntity;
import com.sk89q.worldedit.entity.Entity;
import com.sk89q.worldedit.entity.Player;
import com.sk89q.worldedit.extent.Extent;
import com.sk89q.worldedit.math.BlockVector3;
import com.sk89q.worldedit.math.Vector3;
import com.sk89q.worldedit.regions.Region;
import com.sk89q.worldedit.util.Location;
import com.sk89q.worldedit.util.SideEffect;
import com.sk89q.worldedit.util.SideEffectSet;
import com.sk89q.worldedit.util.TreeGenerator.TreeType;
import com.sk89q.worldedit.world.biome.BiomeType;
import com.sk89q.worldedit.world.biome.BiomeTypes;
import com.sk89q.worldedit.world.block.BaseBlock;
import com.sk89q.worldedit.world.block.BlockState;
import com.sk89q.worldedit.world.block.BlockStateHolder;
import com.sk89q.worldedit.world.block.BlockTypes;
import com.sk89q.worldedit.world.weather.WeatherType;
import com.sk89q.worldedit.world.weather.WeatherTypes;

import java.util.Collections;
import java.util.List;
import java.util.Set;
import javax.annotation.Nullable;

/**
 * A null implementation of {@link World} that drops all changes and
 * returns dummy data.
 */
public class NullWorld extends AbstractWorld {

    private static final NullWorld INSTANCE = new NullWorld();

    protected NullWorld() {
    }

    @Override
    public String getName() {
        return "null";
    }

    @Override
    public String getId() {
        return "null";
    }

    @Override
    public <B extends BlockStateHolder<B>> boolean setBlock(BlockVector3 position, B block, SideEffectSet sideEffects) throws WorldEditException {
        return false;
    }

    @Override
    public Set<SideEffect> applySideEffects(BlockVector3 position, BlockState previousType, SideEffectSet sideEffectSet)
            throws WorldEditException {
        return ImmutableSet.of();
    }

    @Override
    public int getBlockLightLevel(BlockVector3 position) {
        return 0;
    }

    @Override
    public boolean clearContainerBlockContents(BlockVector3 position) {
        return false;
    }
    @Override
    public boolean fullySupports3DBiomes() {
        return false;
    }

    @Override
    public BiomeType getBiome(BlockVector3 position) {
        return BiomeTypes.THE_VOID;
    }

    @Override
    public BiomeType getBiomeType(int x, int y, int z) {
        return BiomeTypes.THE_VOID;
    }

    @Override
    public boolean setBiome(BlockVector3 position, BiomeType biome) {
        return false;
    }

    @Override
    public boolean setBiome(int x, int y, int z, BiomeType biome) {
        return false;
    }

    @Override
    public void dropItem(Vector3 position, BaseItemStack item) {
    }

    @Override
    public void simulateBlockMine(BlockVector3 position) {
    }

    @Override
    public boolean regenerate(Region region, EditSession editSession) {
        return false;
    }

    @Override
    public boolean generateTree(TreeType type, EditSession editSession, BlockVector3 position) throws MaxChangedBlocksException {
        return false;
    }

    @Override
    public WeatherType getWeather() {
        return WeatherTypes.CLEAR;
    }

    @Override
    public long getRemainingWeatherDuration() {
        return 0;
    }

    @Override
    public void setWeather(WeatherType weatherType) {
    }

    @Override
    public void setWeather(WeatherType weatherType, long duration) {
    }

    @Override
    public BlockVector3 getSpawnPosition() {
        return BlockVector3.ZERO;
    }

    @Override
    public void refreshChunk(int chunkX, int chunkZ) {

    }

    @Override
    public IChunkGet get(int x, int z) {
        return NullChunkGet.getInstance();
    }

    @Override
    public BlockState getBlock(BlockVector3 position) {
        return this.getBlock(position.getBlockX(), position.getBlockY(), position.getBlockZ());
    }

    @Override
    public BlockState getBlock(int x, int y, int z) {
        return BlockTypes.AIR.getDefaultState();
    }

    @Override
    public BaseBlock getFullBlock(int x, int y, int z) {
        return BlockTypes.AIR.getDefaultState().toBaseBlock();
    }

    @Override
    public <T extends BlockStateHolder<T>> boolean setBlock(int x, int y, int z, T block) throws WorldEditException {
        return false;
    }

    @Override
    public boolean setTile(int x, int y, int z, CompoundTag tile) throws WorldEditException {
        return false;
    }

    @Override
    public BaseBlock getFullBlock(BlockVector3 position) {
        return getBlock(position).toBaseBlock();
    }

    @Override
    public List<Entity> getEntities(Region region) {
        return Collections.emptyList();
    }

    @Override
    public List<Entity> getEntities() {
        return Collections.emptyList();
    }

    @Nullable
    @Override
    public Entity createEntity(Location location, BaseEntity entity) {
        return null;
    }

    /**
     * Return an instance of this null world.
     *
     * @return a null world
     */
    public static NullWorld getInstance() {
        return INSTANCE;
    }

    @Override
    public void sendFakeChunk(@Nullable Player player, ChunkPacket packet) {
    }

    @Override
    public boolean regenerate(Region region, Extent extent, RegenOptions options) {
        return false;
    }

    @Override
    public void flush() {}
}