package com.massivecraft.factions.entity;

import com.google.gson.reflect.TypeToken;
import com.massivecraft.factions.Factions;
import com.massivecraft.factions.TerritoryAccess;
import com.massivecraft.massivecore.ps.PS;
import com.massivecraft.massivecore.store.Entity;

import java.lang.reflect.Type;
import java.util.Collections;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.concurrent.ConcurrentSkipListMap;
import java.util.function.Function;
import java.util.stream.Collectors;

public class Board extends Entity<Board> implements BoardInterface {
    public static final Type MAP_TYPE = new TypeToken<Map<PS, TerritoryAccess>>() {
    }.getType();

    // -------------------------------------------- //
    // META
    // -------------------------------------------- //

    public static Board get(Object oid) {
        return BoardColl.get().get(oid);
    }

    // -------------------------------------------- //
    // OVERRIDE: ENTITY
    // -------------------------------------------- //

    @Override
    public Board load(Board that) {
        this.map = that.map;

        return this;
    }

    @Override
    public boolean isDefault() {
        if (this.map == null) {
            return true;
        }
        return this.map.isEmpty();
    }

    // -------------------------------------------- //
    // FIELDS
    // -------------------------------------------- //

    private ConcurrentSkipListMap<PS, TerritoryAccess> map;

    public Map<PS, TerritoryAccess> getMap() {
        return Collections.unmodifiableMap(this.map);
    }

    public Map<PS, TerritoryAccess> getMapRaw() {
        return this.map;
    }

    // -------------------------------------------- //
    // CONSTRUCT
    // -------------------------------------------- //

    public Board() {
        this.map = new ConcurrentSkipListMap<>();
    }

    public Board(Map<PS, TerritoryAccess> map) {
        this.map = new ConcurrentSkipListMap<>(map);
    }

    // -------------------------------------------- //
    // OVERRIDE: BOARD
    // -------------------------------------------- //

    // GET

    @Override
    public TerritoryAccess getTerritoryAccessAt(PS ps) {
        if (ps == null) {
            throw new NullPointerException("ps");
        }

        ps = ps.getChunkCoords(true);
        TerritoryAccess ret = this.map.get(ps);
        if (ret == null || ret.getHostFaction() == null) {
            ret = TerritoryAccess.valueOf(Factions.ID_NONE);
        }
        return ret;
    }

    @Override
    public Faction getFactionAt(PS ps) {
        return this.getTerritoryAccessAt(ps).getHostFaction();
    }

    // SET

    @Override
    public void setTerritoryAccessAt(PS ps, TerritoryAccess territoryAccess) {
        ps = ps.getChunkCoords(true);

        if (territoryAccess == null || (territoryAccess.getHostFactionId().equals(Factions.ID_NONE) && territoryAccess.isDefault())) {
            this.map.remove(ps);
        } else {
            this.map.put(ps, territoryAccess);
        }

        this.changed();
    }

    @Override
    public void setFactionAt(PS ps, Faction faction) {
        TerritoryAccess territoryAccess = null;
        if (faction != null) {
            territoryAccess = TerritoryAccess.valueOf(faction.getId());
        }
        this.setTerritoryAccessAt(ps, territoryAccess);
    }

    // REMOVE

    @Override
    public void removeAt(PS ps) {
        this.setTerritoryAccessAt(ps, null);
    }

    @Override
    public void removeAll(Faction faction) {
        this.getChunks(faction).forEach(this::removeAt);
    }

    // CHUNKS

    @Override
    public Set<PS> getChunks(Faction faction) {
        return this.getChunks(faction.getId());
    }

    @Override
    public Set<PS> getChunks(String factionId) {
        return this.map.entrySet().stream()
                .filter(e -> e.getValue().getHostFactionId().equals(factionId))
                .map(Entry::getKey)
                .map(ps -> ps.withWorld(this.getId()))
                .collect(Collectors.toSet());
    }

    @Override
    @Deprecated
    public Map<Faction, Set<PS>> getFactionToChunks() {
        return this.getFactionToChunks(true);
    }

    @Override
    public Map<Faction, Set<PS>> getFactionToChunks(boolean withWorld) {
        Function<Entry<PS, TerritoryAccess>, PS> mapper = Entry::getKey;
        if (withWorld) {
            mapper = mapper.andThen(ps -> ps.withWorld(this.getId()));
        }

        return map.entrySet().stream().collect(Collectors.groupingBy(
                entry -> entry.getValue().getHostFaction(), // This specifies how to get the key
                Collectors.mapping(mapper, Collectors.toSet()) // This maps the entries and puts them in the collection
        ));
    }

    @Override
    public Map<String, Map<Faction, Set<PS>>> getWorldToFactionToChunks(boolean withWorld) {
        return Collections.singletonMap(this.getId(), this.getFactionToChunks(withWorld));
    }

    // COUNT

    @Override
    public int getCount(Faction faction) {
        if (faction == null) {
            throw new NullPointerException("faction");
        }

        return this.getCount(faction.getId());
    }

    @Override
    public int getCount(String factionId) {
        if (factionId == null) {
            throw new NullPointerException("factionId");
        }

        return (int) this.map.values().stream()
                .map(TerritoryAccess::getHostFactionId)
                .filter(factionId::equals)
                .count();
    }

    @Override
    public Map<Faction, Long> getFactionToCount() {
        return this.map.entrySet().stream()
                .collect(Collectors.groupingBy(
                        e -> e.getValue().getHostFaction(),
                        Collectors.counting()
                ));
    }

    // CLAIMED

    @Override
    public boolean hasClaimed(Faction faction) {
        return this.hasClaimed(faction.getId());
    }

    @Override
    public boolean hasClaimed(String factionId) {
        return this.map.values().stream()
                .map(TerritoryAccess::getHostFactionId)
                .anyMatch(factionId::equals);
    }

    // NEARBY DETECTION

    // Is this coord NOT completely surrounded by coords claimed by the same faction?
    // Simpler: Is there any nearby coord with a faction other than the faction here?
    @Override
    public boolean isBorderPs(PS ps) {
        ps = ps.getChunk(true);

        PS nearby;
        Faction faction = this.getFactionAt(ps);

        nearby = ps.withChunkX(ps.getChunkX() + 1);
        if (faction != this.getFactionAt(nearby)) {
            return true;
        }

        nearby = ps.withChunkX(ps.getChunkX() - 1);
        if (faction != this.getFactionAt(nearby)) {
            return true;
        }

        nearby = ps.withChunkZ(ps.getChunkZ() + 1);
        if (faction != this.getFactionAt(nearby)) {
            return true;
        }

        nearby = ps.withChunkZ(ps.getChunkZ() - 1);
        return faction != this.getFactionAt(nearby);
    }

    @Override
    public boolean isAnyBorderPs(Set<PS> pss) {
        return pss.stream().anyMatch(this::isBorderPs);
    }

    // Is this coord connected to any coord claimed by the specified faction?
    @Override
    public boolean isConnectedPs(PS ps, Faction faction) {
        ps = ps.getChunk(true);

        PS nearby;

        nearby = ps.withChunkX(ps.getChunkX() + 1);
        if (faction == this.getFactionAt(nearby)) {
            return true;
        }

        nearby = ps.withChunkX(ps.getChunkX() - 1);
        if (faction == this.getFactionAt(nearby)) {
            return true;
        }

        nearby = ps.withChunkZ(ps.getChunkZ() + 1);
        if (faction == this.getFactionAt(nearby)) {
            return true;
        }

        nearby = ps.withChunkZ(ps.getChunkZ() - 1);
        return faction == this.getFactionAt(nearby);
    }

    @Override
    public boolean isAnyConnectedPs(Set<PS> pss, Faction faction) {
        return pss.stream().anyMatch(ps -> this.isConnectedPs(ps, faction));
    }

}