/*
 * This file is a part of the SteamWar software.
 *
 * Copyright (C) 2020  SteamWar.de-Serverteam
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

package de.steamwar.bausystem.region;

import de.steamwar.bausystem.BauSystem;
import de.steamwar.bausystem.region.dynamic.DynamicRegion;
import de.steamwar.bausystem.region.dynamic.MovementListener;
import de.steamwar.bausystem.region.dynamic.RegionDataRepository;
import de.steamwar.bausystem.region.dynamic.global.GlobalRegion;
import de.steamwar.bausystem.region.dynamic.path.PathRegion;
import de.steamwar.bausystem.region.dynamic.spawn.SpawnPathRegion;
import de.steamwar.bausystem.region.dynamic.spawn.SpawnRegion;
import de.steamwar.bausystem.region.dynamic.spawn.SpawnResetter;
import lombok.NonNull;
import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.World;

import java.util.*;
import java.util.stream.Stream;

public class DynamicRegionSystem implements RegionSystem {

    public static DynamicRegionSystem INSTANCE;
    private static final World WORLD = Bukkit.getWorlds().get(0);

    private static Map<UUID, Region> regionMap = new HashMap<>();

    @Override
    public void load() {
        INSTANCE = this;
        new DynamicRegionCommand();
        RegionDataRepository.loadRegions();
        Bukkit.getPluginManager().registerEvents(new MovementListener(), BauSystem.getInstance());

        if (regionMap.isEmpty()) {
            new SpawnRegion(-9, -9);
            new SpawnPathRegion(-9, -28);
            new SpawnPathRegion(-9, 10);
            new SpawnPathRegion(-28, -9);
            new SpawnPathRegion(10, -9);

            new PathRegion(-28, -28);
            new PathRegion(-28, 10);
            new PathRegion(10, -28);
            new PathRegion(10, 10);
        }
    }

    public void add(DynamicRegion region) {
        regionMap.put(region.getID(), region);
    }

    public void delete(DynamicRegion region) {
        regionMap.remove(region.getID());
    }

    @Override
    public void save() {
    }

    @Override
    public @NonNull Location getWorldSpawn() {
        if (SpawnResetter.isBigSpawn()) {
            return SpawnResetter.BIG_WORLD_SPAWN;
        } else {
            return SpawnResetter.SMALL_WORLD_SPAWN;
        }
    }

    @Override
    public @NonNull Region getGlobalRegion() {
        return GlobalRegion.INSTANCE;
    }

    @Override
    public @NonNull Region get(@NonNull Location location) {
        return regionMap.values().stream()
                .filter(region -> region.getArea().inRegion(location, false))
                .findFirst()
                .orElse(GlobalRegion.INSTANCE);
    }

    @Override
    public Optional<Region> getRegion(@NonNull UUID id) {
        return Optional.ofNullable(regionMap.get(id));
    }

    @Override
    public @NonNull Stream<Region> getRegions() {
        return regionMap.values().stream();
    }

    public Stream<DynamicRegion> getNeighbours(Region region) {
        Point minPoint = region.getArea().getMinPoint(false).subtract(18, 0, 18);
        Point maxPoint = region.getArea().getMaxPoint(false).add(19, 0, 19);
        // TODO: Optimize Set away!
        Set<Region> neighbours = new HashSet<>();
        for (int x = minPoint.getX(); x <= maxPoint.getX(); x += 19) {
            int minZ = minPoint.getZ();
            int maxZ = maxPoint.getZ();
            neighbours.add(get(new Location(WORLD, x, 0, minZ)));
            neighbours.add(get(new Location(WORLD, x, 0, maxZ)));
        }
        for (int z = minPoint.getZ() + 18; z <= maxPoint.getZ() - 19; z += 19) {
            int minX = minPoint.getX();
            int maxX = maxPoint.getX();
            neighbours.add(get(new Location(WORLD, minX, 0, z)));
            neighbours.add(get(new Location(WORLD, maxX, 0, z)));
        }
        neighbours.remove(GlobalRegion.INSTANCE);
        return ((Set<DynamicRegion>)(Set) neighbours).stream();
    }
}