package world.bentobox.caveblock.generators;

import org.bukkit.Material;
import org.bukkit.World;
import org.bukkit.generator.BiomeProvider;
import org.bukkit.generator.BlockPopulator;
import org.bukkit.generator.ChunkGenerator;
import org.bukkit.generator.WorldInfo;

import world.bentobox.caveblock.CaveBlock;
import world.bentobox.caveblock.Settings;
import world.bentobox.caveblock.generators.populators.*;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

/**
 * Class ChunkGeneratorWorld ...
 *
 * @author BONNe
 * Created on 27.01.2019
 */
public class ChunkGeneratorWorld extends ChunkGenerator {
    // ---------------------------------------------------------------------
    // Section: Variables
    // ---------------------------------------------------------------------

    private final CaveBlock addon;
    private final Settings settings;
    private final List<BlockPopulator> blockPopulators;
    private final World.Environment environment;
    private BiomeProvider biomeProvider;
    private boolean isNewGenerator;

    // ---------------------------------------------------------------------
    // Section: Constructor
    // ---------------------------------------------------------------------

    /**
     * @param addon - CaveBlock object
     * @param environment - World environment
     */
    public ChunkGeneratorWorld(CaveBlock addon, World.Environment environment) {
        this.addon = addon;
        this.settings = addon.getSettings();
        this.blockPopulators = new ArrayList<>(2);

        this.environment = environment;
        reload();
    }

    // ---------------------------------------------------------------------
    // Section: Methods
    // ---------------------------------------------------------------------

    private Material getGroundRoofMaterial(World.Environment environment) {
        return switch (environment) {
            case NETHER -> this.settings.isNetherRoof() ? Material.BEDROCK : this.settings.getNetherMainBlock();
            case THE_END -> this.settings.isEndRoof() ? Material.BEDROCK : this.settings.getEndMainBlock();
            default -> this.settings.isNormalRoof() ? Material.BEDROCK : this.settings.getNormalMainBlock();
        };
    }


    private Material getGroundFloorMaterial(World.Environment environment) {
        return switch (environment) {
            case NETHER -> this.settings.isNetherFloor() ? Material.BEDROCK : this.settings.getNetherMainBlock();
            case THE_END -> this.settings.isEndFloor() ? Material.BEDROCK : this.settings.getEndMainBlock();
            default -> this.settings.isNormalFloor() ? Material.BEDROCK : this.settings.getNormalMainBlock();
        };
    }


    private Material getBaseMaterial(World.Environment environment) {
        return switch (environment) {
            case NETHER -> this.settings.getNetherMainBlock();
            case THE_END -> this.settings.getEndMainBlock();
            default -> this.settings.getNormalMainBlock();
        };
    }

    @Override
    public void generateBedrock(WorldInfo worldInfo, Random random, int chunkX, int chunkZ, ChunkData chunkData)
    {
        if (!this.shouldGenerateBedrock())
        {
            final int minHeight = worldInfo.getMinHeight();
            Material material = this.getGroundFloorMaterial(worldInfo.getEnvironment());
            chunkData.setRegion(0, minHeight, 0, 16, minHeight + 1, 16, material);
        }
        else
        {
            // Apparently default surface generation does not include 0 bedrock layer.
            final int minHeight = worldInfo.getMinHeight();
            chunkData.setRegion(0, minHeight, 0, 16, minHeight + 1, 16, Material.BEDROCK);
        }
    }


    @Override
    public void generateSurface(WorldInfo worldInfo, Random random, int chunkX, int chunkZ, ChunkData chunkData)
    {
        if (!this.shouldGenerateSurface())
        {
            final int worldHeight = Math.min(worldInfo.getMaxHeight(), this.settings.getWorldDepth());
            Material material = this.getGroundRoofMaterial(worldInfo.getEnvironment());
            chunkData.setRegion(0, worldHeight - 1, 0, 16, worldHeight, 16, material);
        }
    }


    @Override
    public void generateNoise(WorldInfo worldInfo, Random random, int chunkX, int chunkZ, ChunkData chunkData) {
        final int minHeight = worldInfo.getMinHeight();
        final int worldHeight = Math.min(worldInfo.getMaxHeight(), this.settings.getWorldDepth());
        final World.Environment environment = worldInfo.getEnvironment();
        if (isNewGenerator) {
            switch (environment) {
                case NETHER:
                    if (worldHeight + 1 > 34) {
                        chunkData.setRegion(0, minHeight + 1, 0, 16, 34, 16, Material.SOUL_SAND);
                        chunkData.setRegion(0, 34, 0, 16, worldHeight - 1, 16, Material.NETHERRACK);
                    } else {
                        chunkData.setRegion(0, minHeight + 1, 0, 16, worldHeight - 1, 16, Material.NETHERRACK);
                    }
                    break;
                case THE_END:
                    chunkData.setRegion(0, minHeight + 1, 0, 16, worldHeight - 1, 16, Material.END_STONE);
                    break;
                default:
                    if (worldHeight + 1 > 7) {
                        chunkData.setRegion(0, minHeight + 1, 0, 16, 7, 16, Material.DEEPSLATE);
                        chunkData.setRegion(0, 7, 0, 16, worldHeight - 1, 16, Material.STONE);
                    } else {
                        chunkData.setRegion(0, minHeight + 1, 0, 16, worldHeight - 1, 16, Material.STONE);
                    }
                    break;
            }
        } else {
            Material material = getBaseMaterial(environment);
            chunkData.setRegion(0, minHeight + 1, 0, 16, worldHeight - 1, 16, material);
        }
    }

    @Override
    public List<BlockPopulator> getDefaultPopulators(final World world) {
        return this.blockPopulators;
    }

    @Override
    public BiomeProvider getDefaultBiomeProvider(WorldInfo worldInfo) {
        return biomeProvider;
    }

    @Override
    public boolean shouldGenerateSurface()
    {
        // Surface generation should happen only in overworld. Nether and end worlds does not have surface.
        return this.environment.equals(World.Environment.NORMAL) && this.settings.isGenerateNaturalSurface();
    }

    @Override
    public boolean shouldGenerateBedrock() {
        // Bedrock generation should happen only in overworld. Nether and end worlds does not have nice bedrock layers.
        return this.environment.equals(World.Environment.NORMAL) && this.settings.isGenerateNaturalBedrock();
    }

    @Override
    public boolean shouldGenerateCaves() {
        // Cave generation should happen only in overworld. Nether and end worlds does not have nice cave layers.
        return this.environment.equals(World.Environment.NORMAL) && this.settings.isGenerateCaves();
    }

    /**
     * Called when config is reloaded
     */
    public void reload() {
        this.blockPopulators.clear();
        this.isNewGenerator = this.settings.isNewMaterialGenerator();

        if (this.isNewGenerator) {
            this.blockPopulators.add(new NewMaterialPopulator(this.settings.getWorldDepth()));
            this.biomeProvider = null;
        } else {
            this.blockPopulators.add(new MaterialPopulator(this.addon));
            this.blockPopulators.add(new EntitiesPopulator(this.addon));
            this.biomeProvider = new FlatBiomeProvider(this.addon);
        }
    }
}