/*
 * This file is a part of the SteamWar software.
 *
 * Copyright (C) 2021  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 com.sk89q.worldedit.EditSession;
import de.steamwar.bausystem.region.flags.Flag;
import de.steamwar.bausystem.region.utils.RegionExtensionType;
import de.steamwar.bausystem.region.utils.RegionType;
import de.steamwar.bausystem.shared.SizedStack;
import lombok.Getter;
import lombok.NonNull;
import org.bukkit.Location;
import yapion.hierarchy.types.YAPIONObject;
import yapion.hierarchy.types.YAPIONType;
import yapion.hierarchy.types.YAPIONValue;
import yapion.serializing.YAPIONSerializer;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.function.Consumer;

@Getter
public class Region {

    private static final List<Region> REGION_LIST = new ArrayList<>();

    public static Region getRegion(Location location) {
        for (Region region : REGION_LIST) {
            if (region.inRegion(location, RegionType.NORMAL, RegionExtensionType.NORMAL)) {
                return region;
            }
        }
        return GlobalRegion.instance;
    }

    private YAPIONObject regionData;

    private String name;
    private Prototype prototype;
    private Set<Prototype> prototypes;

    private Point minPoint;
    private Point maxPoint;

    private Point minPointTestblock;
    private Point maxPointTestblock;

    private Point minPointTestblockExtension;
    private Point maxPointTestblockExtension;

    private Point minPointBuild;
    private Point maxPointBuild;

    private Point minPointBuildExtension;
    private Point maxPointBuildExtension;

    private int floorLevel;
    private int waterLevel;

    private String linkedRegionName = null; // Nullable
    private Region linkedRegion = null; // Nullable

    private FlagStorage flagStorage;

    private SizedStack<EditSession> undoSessions;
    private SizedStack<EditSession> redoSessions;

    public Region(String name, Prototype prototype, YAPIONObject regionConfig, FlagStorage flagStorage, YAPIONObject regionData) {
        this.name = name;
        this.regionData = regionData;
        if (prototype != null) {
            REGION_LIST.add(this);
        }

        if (regionConfig.containsKey("linkedWith")) {
            linkedRegionName = regionConfig.getPlainValue("linkedWith");
        }

        prototypes = new HashSet<>();
        if (regionConfig.containsKey("prototypes", YAPIONType.ARRAY)) {
            regionConfig.getArray("prototypes").forEach(yapionAnyType -> {
                if (yapionAnyType instanceof YAPIONValue) {
                    prototypes.add(Prototype.PROTOTYPE_MAP.get(((YAPIONValue<String>) yapionAnyType).get()));
                }
            });
        }
        this.flagStorage = flagStorage;
        Point point = null;
        if (regionConfig.containsKey("minX", Integer.class) && regionConfig.containsKey("minY", Integer.class) && regionConfig.containsKey("minZ", Integer.class)) {
            point = new Point(regionConfig.getPlainValue("minX"), regionConfig.getPlainValue("minY"), regionConfig.getPlainValue("minZ"));
        }
        generatePrototypeData(prototype, point);
    }

    private void generatePrototypeData(Prototype prototype, Point point) {
        if (prototype == null) {
            return;
        }

        if (this.prototype != null && !prototypes.contains(prototype)) {
            return;
        }
        this.prototype = prototype;

        this.minPoint = point;
        this.maxPoint = point.add(prototype.getSizeX(), prototype.getSizeY(), prototype.getSizeZ());

        if (prototype.getTestblock() != null) {
            this.minPointTestblock = point.add(prototype.getTestblock().getOffsetX(), prototype.getTestblock().getOffsetY(), prototype.getTestblock().getOffsetZ());
            this.maxPointTestblock = this.minPointTestblock.add(prototype.getTestblock().getSizeX(), prototype.getTestblock().getSizeY(), prototype.getTestblock().getSizeZ());

            this.minPointTestblockExtension = this.minPointTestblock.substract(prototype.getTestblock().getExtensionNegativeX(), prototype.getTestblock().getExtensionNegativeY(), prototype.getTestblock().getExtensionNegativeZ());
            this.maxPointTestblockExtension = this.maxPointTestblock.add(prototype.getTestblock().getExtensionPositiveX(), prototype.getTestblock().getExtensionPositiveY(), prototype.getTestblock().getExtensionPositiveZ());
        }

        if (prototype.getBuild() != null) {
            this.minPointBuild = point.add(prototype.getBuild().getOffsetX(), prototype.getBuild().getOffsetY(), prototype.getBuild().getOffsetZ());
            this.maxPointBuild = this.minPointBuild.add(prototype.getBuild().getSizeX(), prototype.getBuild().getSizeY(), prototype.getBuild().getSizeZ());

            this.minPointBuildExtension = this.minPointBuild.substract(prototype.getBuild().getExtensionNegativeX(), prototype.getBuild().getExtensionNegativeY(), prototype.getBuild().getExtensionNegativeZ());
            this.maxPointBuildExtension = this.maxPointBuild.add(prototype.getBuild().getExtensionPositiveX(), prototype.getBuild().getExtensionPositiveY(), prototype.getBuild().getExtensionPositiveZ());
        }

        if (prototype.getFloorOffset() != 0) {
            floorLevel = minPoint.getY() + prototype.getFloorOffset();
        } else {
            floorLevel = 0;
        }

        if (prototype.getWaterOffset() != 0) {
            waterLevel = minPoint.getY() + prototype.getWaterOffset();
        } else {
            waterLevel = 0;
        }
    }

    public boolean inRegion(Location location, RegionType regionType, RegionExtensionType regionExtensionType) {
        if (!hasType(regionType)) {
            return false;
        }
        switch (regionType) {
            case BUILD:
                Point minBPoint = regionExtensionType == RegionExtensionType.EXTENSION ? minPointBuildExtension : minPointBuild;
                Point maxBPoint = regionExtensionType == RegionExtensionType.EXTENSION ? maxPointBuildExtension : maxPointBuild;
                return inRegion(location, minBPoint, maxBPoint);
            case TESTBLOCK:
                Point minTBPoint = regionExtensionType == RegionExtensionType.EXTENSION ? minPointTestblockExtension : minPointTestblock;
                Point maxTBPoint = regionExtensionType == RegionExtensionType.EXTENSION ? maxPointTestblockExtension : maxPointTestblock;
                return inRegion(location, minTBPoint, maxTBPoint);
            default:
            case NORMAL:
                return inRegion(location, minPoint, maxPoint);
        }
    }

    private boolean inRegion(Location location, Point minPoint, Point maxPoint) {
        return location.getBlockX() >= minPoint.getX() && location.getBlockX() < maxPoint.getX() &&
                location.getBlockY() >= minPoint.getY() && location.getBlockY() < maxPoint.getY() &&
                location.getBlockZ() >= minPoint.getZ() && location.getBlockZ() < maxPoint.getZ();
    }

    public boolean hasType(RegionType regionType) {
        switch (regionType) {
            case BUILD:
                return prototype != null && prototype.getBuild() != null;
            case TESTBLOCK:
                return prototype != null && prototype.getTestblock() != null;
            default:
            case NORMAL:
                return true;
        }
    }

    public String getDisplayName() {
        return prototype != null ? prototype.getDisplayName() : "";
    }

    private void setLinkedRegion(Consumer<Region> regionConsumer) {
        if (linkedRegionName == null) {
            return;
        }
        if (linkedRegion != null) {
            regionConsumer.accept(linkedRegion);
            return;
        }
        for (Region region : REGION_LIST) {
            if (region.name.equals(name)) {
                linkedRegion = region;
                regionConsumer.accept(linkedRegion);
                return;
            }
        }
    }

    public void setPrototype(@NonNull Prototype prototype) {
        if (this.prototype == null) {
            return;
        }
        regionData.add("prototype", prototype.getName());
        generatePrototypeData(prototype, minPoint);
        setLinkedRegion(region -> {
            region.regionData.add("prototype", prototype.getName());
            region.generatePrototypeData(prototype, region.minPoint);
        });
    }

    public void set(Flag flagType, Flag.Value<?> value) {
        if (flagStorage.set(flagType, value)) {
            regionData.add("flagStorage", YAPIONSerializer.serialize(flagStorage));
        }
        setLinkedRegion(region -> region.set(flagType, value));
    }

    public <T extends Enum<T> & Flag.Value<T>> Flag.Value<T> get(Flag flagType) {
        return flagStorage.get(flagType);
    }

    public <T extends Enum<T> & Flag.Value<T>> T getPlain(Flag flagType) {
        return (T) flagStorage.get(flagType).getValue();
    }

    public <T extends Enum<T> & Flag.Value<T>> T getPlain(Flag flagType, Class<T> type) {
        return (T) flagStorage.get(flagType).getValue();
    }

    public void reset(RegionType regionType) {
        if (!hasType(regionType)) {
            return;
        }
        switch (regionType) {
            case BUILD:

            case TESTBLOCK:
            default:
            case NORMAL:
        }
    }

}