package dev.loki.killer;

import dev.loki.config.GameConfig;
import dev.loki.player.Killer;
import dev.loki.player.PlayerState;
import dev.loki.player.Survivor;
import net.kyori.adventure.text.Component;
import net.kyori.adventure.text.format.NamedTextColor;
import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.entity.Player;
import org.bukkit.plugin.Plugin;
import org.bukkit.potion.PotionEffect;
import org.bukkit.potion.PotionEffectType;
import org.bukkit.scheduler.BukkitTask;

import java.util.HashMap;
import java.util.Map;
import java.util.UUID;

/**
 * Manages the Killer carrying a downed Survivor.
 *
 * Escape mechanic: Survivor spams SPACE (jump) to fill the escape bar.
 * When the bar reaches 100% the Survivor breaks free, is teleported
 * slightly forward and receives Speed I for carry.escape-speed-seconds.
 */
public class KillerCarry {
    private final Plugin plugin;
    private final GameConfig config;
    private final Map<UUID, CarryData> activeCarries = new HashMap<>();
    private BukkitTask carryTask;

    // Separate map: killerUUID -> carried survivor UUID (for jump listener)
    private final Map<UUID, UUID> killerToSurvivor = new HashMap<>();

    private static class CarryData {
        final Killer killer;
        final Survivor survivor;
        double wiggleProgress; // 0..100

        CarryData(Killer killer, Survivor survivor) {
            this.killer   = killer;
            this.survivor = survivor;
            this.wiggleProgress = 0;
        }
    }

    public KillerCarry(Plugin plugin, GameConfig config) {
        this.plugin = plugin;
        this.config = config;
    }

    // -------------------------------------------------------------------------
    // Called by PlayerJumpListener when a survivor jumps
    // -------------------------------------------------------------------------
    public void onSurvivorJump(UUID survivorUuid) {
        for (CarryData data : activeCarries.values()) {
            if (data.survivor.getUuid().equals(survivorUuid)) {
                data.wiggleProgress += config.getCarryJumpFillPercent();
                showWiggleProgress(data);
                if (data.wiggleProgress >= 100) {
                    Bukkit.getScheduler().runTask(plugin, () -> forceDrop(data.killer));
                }
                return;
            }
        }
    }

    // -------------------------------------------------------------------------
    // Public API
    // -------------------------------------------------------------------------

    public boolean tryPickup(Killer killer, Survivor survivor) {
        if (!canPickup(killer, survivor)) return false;

        Player killerPlayer = killer.getPlayer();
        Player survivorPlayer = survivor.getPlayer();
        if (killerPlayer == null || survivorPlayer == null) return false;
        if (!HitValidator.isValidCarryPosition(killerPlayer, survivorPlayer)) return false;

        startCarry(killer, survivor);
        return true;
    }

    public boolean canPickup(Killer killer, Survivor survivor) {
        if (killer.isCarrying()) return false;
        if (survivor.getState() != PlayerState.DOWNED) return false;
        Player kp = killer.getPlayer();
        Player sp = survivor.getPlayer();
        return kp != null && sp != null && sp.isOnline();
    }

    public boolean drop(Killer killer) {
        CarryData data = activeCarries.remove(killer.getUuid());
        killerToSurvivor.remove(killer.getUuid());
        if (data == null) return false;
        stopCarry(data, false);
        return true;
    }

    public void forceDrop(Killer killer) {
        CarryData data = activeCarries.remove(killer.getUuid());
        killerToSurvivor.remove(killer.getUuid());
        if (data == null) return;
        stopCarry(data, true);
    }

    public boolean isCarrying(Killer killer) {
        return activeCarries.containsKey(killer.getUuid());
    }

    public Survivor getCarried(Killer killer) {
        CarryData data = activeCarries.get(killer.getUuid());
        return data != null ? data.survivor : null;
    }

    public double getWiggleProgress(Killer killer) {
        CarryData data = activeCarries.get(killer.getUuid());
        return data != null ? data.wiggleProgress : 0;
    }

    public void shutdown() {
        if (carryTask != null) { carryTask.cancel(); carryTask = null; }
        for (CarryData data : new HashMap<>(activeCarries).values()) {
            stopCarry(data, false);
        }
        activeCarries.clear();
        killerToSurvivor.clear();
    }

    // -------------------------------------------------------------------------
    // Private
    // -------------------------------------------------------------------------

    private void startCarry(Killer killer, Survivor survivor) {
        killer.setCarrying(true);
        survivor.setState(PlayerState.CARRIED);

        Player survivorPlayer = survivor.getPlayer();
        if (survivorPlayer != null) {
            survivorPlayer.setInvisible(true);
            survivorPlayer.sendMessage(Component.text(
                "[DBD] Нажимайте ПРОБЕЛ чтобы вырваться!", NamedTextColor.YELLOW));
        }

        CarryData data = new CarryData(killer, survivor);
        activeCarries.put(killer.getUuid(), data);
        killerToSurvivor.put(killer.getUuid(), survivor.getUuid());

        if (carryTask == null) startCarryTask();
    }

    private void stopCarry(CarryData data, boolean escaped) {
        data.killer.setCarrying(false);

        Player killerPlayer  = data.killer.getPlayer();
        Player survivorPlayer = data.survivor.getPlayer();

        if (survivorPlayer != null && survivorPlayer.isOnline()) {
            survivorPlayer.setInvisible(false);

            if (escaped) {
                // Drop survivor slightly forward from killer
                Location dropLoc = survivorPlayer.getLocation();
                if (killerPlayer != null) {
                    dropLoc = killerPlayer.getLocation().clone()
                        .add(killerPlayer.getLocation().getDirection().multiply(2.0));
                }
                survivorPlayer.teleport(dropLoc);

                // Speed I
                int speedTicks = config.getCarryEscapeSpeedSeconds() * 20;
                survivorPlayer.addPotionEffect(
                    new PotionEffect(PotionEffectType.SPEED, speedTicks, 0, false, true));

                survivorPlayer.sendMessage(Component.text(
                    "[DBD] Вы вырвались!", NamedTextColor.GREEN));

                data.survivor.setState(PlayerState.DOWNED); // still downed, just free
            } else {
                survivorPlayer.teleport(data.killer.getPlayer() != null
                    ? data.killer.getPlayer().getLocation()
                    : survivorPlayer.getLocation());
                data.survivor.setState(PlayerState.DOWNED);
            }

            // Clear action bar progress
            survivorPlayer.sendActionBar(Component.empty());
        }

        if (activeCarries.isEmpty() && carryTask != null) {
            carryTask.cancel();
            carryTask = null;
        }
    }

    private void startCarryTask() {
        carryTask = Bukkit.getScheduler().runTaskTimer(plugin, () -> {
            if (activeCarries.isEmpty()) return;
            for (CarryData data : new HashMap<>(activeCarries).values()) {
                if (!isValidCarry(data)) {
                    activeCarries.remove(data.killer.getUuid());
                    killerToSurvivor.remove(data.killer.getUuid());
                    stopCarry(data, false);
                    continue;
                }
                updateCarryPosition(data);
                showWiggleProgress(data); // refresh bar every tick
            }
        }, 1L, 1L);
    }

    private boolean isValidCarry(CarryData data) {
        Player kp = data.killer.getPlayer();
        Player sp = data.survivor.getPlayer();
        return kp != null && sp != null && kp.isOnline() && sp.isOnline();
    }

    private void updateCarryPosition(CarryData data) {
        Player killerPlayer   = data.killer.getPlayer();
        Player survivorPlayer = data.survivor.getPlayer();
        if (killerPlayer == null || survivorPlayer == null) return;

        Location carryLoc = killerPlayer.getLocation().clone().add(0, -0.5, 0);
        survivorPlayer.teleport(carryLoc);
    }

    private void showWiggleProgress(CarryData data) {
        Player survivorPlayer = data.survivor.getPlayer();
        if (survivorPlayer == null) return;

        double pct = Math.min(100, data.wiggleProgress);
        int filled = (int) (pct / 10);
        int empty  = 10 - filled;
        String bar = "§e[" + "§a█".repeat(filled) + "§7░".repeat(empty) + "§e]";
        survivorPlayer.sendActionBar(Component.text("§6Побег: " + bar + " " + (int) pct + "%"));
    }
}