package emu.grasscutter.server.game;

import emu.grasscutter.GameConstants;
import emu.grasscutter.Grasscutter;
import emu.grasscutter.database.DatabaseHelper;
import emu.grasscutter.game.Account;
import emu.grasscutter.game.battlepass.BattlePassSystem;
import emu.grasscutter.game.chat.ChatSystem;
import emu.grasscutter.game.chat.ChatSystemHandler;
import emu.grasscutter.game.combine.CombineManger;
import emu.grasscutter.game.drop.DropSystem;
import emu.grasscutter.game.dungeons.DungeonSystem;
import emu.grasscutter.game.dungeons.challenge.DungeonChallenge;
import emu.grasscutter.game.expedition.ExpeditionSystem;
import emu.grasscutter.game.gacha.GachaSystem;
import emu.grasscutter.game.managers.CookingManager;
import emu.grasscutter.game.managers.energy.EnergyManager;
import emu.grasscutter.game.managers.stamina.StaminaManager;
import emu.grasscutter.game.player.Player;
import emu.grasscutter.game.quest.QuestSystem;
import emu.grasscutter.game.shop.ShopSystem;
import emu.grasscutter.game.systems.AnnouncementSystem;
import emu.grasscutter.game.systems.InventorySystem;
import emu.grasscutter.game.systems.MultiplayerSystem;
import emu.grasscutter.game.tower.TowerSystem;
import emu.grasscutter.game.world.World;
import emu.grasscutter.game.world.WorldDataSystem;
import emu.grasscutter.net.packet.PacketHandler;
import emu.grasscutter.net.proto.SocialDetailOuterClass.SocialDetail;
import emu.grasscutter.server.event.types.ServerEvent;
import emu.grasscutter.server.event.game.ServerTickEvent;
import emu.grasscutter.server.event.internal.ServerStartEvent;
import emu.grasscutter.server.event.internal.ServerStopEvent;
import emu.grasscutter.server.scheduler.ServerTaskScheduler;
import emu.grasscutter.task.TaskMap;
import kcp.highway.ChannelConfig;
import kcp.highway.KcpServer;
import lombok.Getter;

import java.net.InetSocketAddress;
import java.time.Instant;
import java.time.OffsetDateTime;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;

import static emu.grasscutter.config.Configuration.*;
import static emu.grasscutter.utils.Language.translate;

@Getter
public final class GameServer extends KcpServer {
    // Game server base
    private final InetSocketAddress address;
    private final GameServerPacketHandler packetHandler;
    private final Map<Integer, Player> players;
    private final Set<World> worlds;

    // Server systems
    private final InventorySystem inventorySystem;
    private final GachaSystem gachaSystem;
    private final ShopSystem shopSystem;
    private final MultiplayerSystem multiplayerSystem;
    private final DungeonSystem dungeonSystem;
    private final ExpeditionSystem expeditionSystem;
    private final DropSystem dropSystem;
    private final WorldDataSystem worldDataSystem;
    private final BattlePassSystem battlePassSystem;
    private final CombineManger combineSystem;
    private final TowerSystem towerSystem;
    private final AnnouncementSystem announcementSystem;
    private final QuestSystem questSystem;

    // Extra
    private final ServerTaskScheduler scheduler;
    private final TaskMap taskMap;

    private ChatSystemHandler chatManager;

    public GameServer() {
        this(getAdapterInetSocketAddress());
    }

    public GameServer(InetSocketAddress address) {
        ChannelConfig channelConfig = new ChannelConfig();
        channelConfig.nodelay(true, GAME_INFO.kcpInterval, 2, true);
        channelConfig.setMtu(1400);
        channelConfig.setSndwnd(256);
        channelConfig.setRcvwnd(256);
        channelConfig.setTimeoutMillis(30 * 1000);//30s
        channelConfig.setUseConvChannel(true);
        channelConfig.setAckNoDelay(false);

        this.init(GameSessionManager.getListener(),channelConfig,address);

        DungeonChallenge.initialize();
        EnergyManager.initialize();
        StaminaManager.initialize();
        CookingManager.initialize();
        CombineManger.initialize();

        // Game Server base
        this.address = address;
        this.packetHandler = new GameServerPacketHandler(PacketHandler.class);
        this.players = new ConcurrentHashMap<>();
        this.worlds = Collections.synchronizedSet(new HashSet<>());

        // Extra
        this.scheduler = new ServerTaskScheduler();
        this.taskMap = new TaskMap(true);

        // Create game systems
        this.inventorySystem = new InventorySystem(this);
        this.gachaSystem = new GachaSystem(this);
        this.shopSystem = new ShopSystem(this);
        this.multiplayerSystem = new MultiplayerSystem(this);
        this.dungeonSystem = new DungeonSystem(this);
        this.dropSystem = new DropSystem(this);
        this.expeditionSystem = new ExpeditionSystem(this);
        this.combineSystem = new CombineManger(this);
        this.towerSystem = new TowerSystem(this);
        this.worldDataSystem = new WorldDataSystem(this);
        this.battlePassSystem = new BattlePassSystem(this);
        this.announcementSystem = new AnnouncementSystem(this);
        this.questSystem = new QuestSystem(this);

        // Chata manager
        this.chatManager = new ChatSystem(this);

        // Hook into shutdown event.
        Runtime.getRuntime().addShutdownHook(new Thread(this::onServerShutdown));
    }

    @Deprecated
    public ChatSystemHandler getChatManager() {
        return chatManager;
    }

    @Deprecated
    public void setChatManager(ChatSystemHandler chatManager) {
        this.chatManager = chatManager;
    }

    public ChatSystemHandler getChatSystem() {
        return chatManager;
    }

    public void setChatSystem(ChatSystemHandler chatManager) {
        this.chatManager = chatManager;
    }

    private static InetSocketAddress getAdapterInetSocketAddress() {
        InetSocketAddress inetSocketAddress;
        if (GAME_INFO.bindAddress.equals("")) {
            inetSocketAddress=new InetSocketAddress(GAME_INFO.bindPort);
        }else {
            inetSocketAddress=new InetSocketAddress(
                    GAME_INFO.bindAddress,
                    GAME_INFO.bindPort
            );
        }
        return inetSocketAddress;
    }

    public void registerPlayer(Player player) {
        getPlayers().put(player.getUid(), player);
    }

    public Player getPlayerByUid(int id) {
        return this.getPlayerByUid(id, false);
    }

    public Player getPlayerByUid(int id, boolean allowOfflinePlayers) {
        // Console check
        if (id == GameConstants.SERVER_CONSOLE_UID) {
            return null;
        }

        // Get from online players
        Player player = this.getPlayers().get(id);

        if (!allowOfflinePlayers) {
            return player;
        }

        // Check database if character isnt here
        if (player == null) {
            player = DatabaseHelper.getPlayerByUid(id);
        }

        return player;
    }

    public Player getPlayerByAccountId(String accountId) {
        Optional<Player> playerOpt = getPlayers().values().stream().filter(player -> player.getAccount().getId().equals(accountId)).findFirst();
        return playerOpt.orElse(null);
    }

    public SocialDetail.Builder getSocialDetailByUid(int id) {
        // Get from online players
        Player player = this.getPlayerByUid(id, true);

        if (player == null) {
            return null;
        }

        return player.getSocialDetail();
    }

    public Account getAccountByName(String username) {
        Optional<Player> playerOpt = getPlayers().values().stream().filter(player -> player.getAccount().getUsername().equals(username)).findFirst();
        if (playerOpt.isPresent()) {
            return playerOpt.get().getAccount();
        }
        return DatabaseHelper.getAccountByName(username);
    }

    public synchronized void onTick() {
        var tickStart = Instant.now();

        // Tick worlds.
        this.worlds.removeIf(World::onTick);

        // Tick players.
        this.players.values().forEach(Player::onTick);

        // Tick scheduler.
        this.getScheduler().runTasks();

        // Call server tick event.
        ServerTickEvent event = new ServerTickEvent(tickStart, Instant.now());
        event.call();
    }

    public void registerWorld(World world) {
        this.getWorlds().add(world);
    }

    public void deregisterWorld(World world) {
        // TODO Auto-generated method stub

    }

    public void start() {
        // Schedule game loop.
        Timer gameLoop = new Timer();
        gameLoop.scheduleAtFixedRate(new TimerTask() {
            @Override
            public void run() {
                try {
                    onTick();
                } catch (Exception e) {
                    Grasscutter.getLogger().error(translate("messages.game.game_update_error"), e);
                }
            }
        }, new Date(), 1000L);
        Grasscutter.getLogger().info(translate("messages.status.free_software"));
        Grasscutter.getLogger().info(translate("messages.game.port_bind", Integer.toString(address.getPort())));
        ServerStartEvent event = new ServerStartEvent(ServerEvent.Type.GAME, OffsetDateTime.now());
        event.call();
    }

    public void onServerShutdown() {
        ServerStopEvent event = new ServerStopEvent(ServerEvent.Type.GAME, OffsetDateTime.now()); event.call();

        // Kick and save all players
        List<Player> list = new ArrayList<>(this.getPlayers().size());
        list.addAll(this.getPlayers().values());

        for (Player player : list) {
            player.getSession().close();
        }
    }
}
