package dev.loki.survivor;

import dev.loki.config.GameConfig;
import dev.loki.player.PlayerState;
import dev.loki.player.Survivor;
import net.kyori.adventure.text.Component;
import net.kyori.adventure.text.minimessage.MiniMessage;
import org.bukkit.entity.Player;

import java.util.UUID;
import java.util.function.Function;

/**
 * Handles healing another survivor (shift + proximity, 15 sec by default)
 * or self-healing with a medkit (configurable).
 * Limits: max-heals-per-match heals per survivor.
 */
public class SurvivorHealing {
    private final SurvivorController controller;
    private final GameConfig config;

    private Player healingTarget;
    private int healingTicks;
    private int totalHealingTicks;
    private boolean isSelfHeal;

    // Per-survivor heal counter (tracks heals used this match)
    private int healsUsed = 0;

    /** Lookup function to find ANY player's Survivor (for healing others). */
    private Function<Player, Survivor> survivorLookup;

    public void setSurvivorLookup(Function<Player, Survivor> lookup) {
        this.survivorLookup = lookup;
    }

    public boolean hasSurvivorLookup() {
        return survivorLookup != null;
    }

    public SurvivorHealing(SurvivorController controller, GameConfig config) {
        this.controller = controller;
        this.config     = config;
    }

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

    public void startHealing(Player target) {
        if (isHealing()) return;
        if (controller.isDowned()) return;

        Player healer = controller.getPlayer();
        if (healer == null) return;

        // Check heal limit
        if (healsUsed >= config.getMaxHealsPerMatch()) {
            healer.sendMessage(Component.text("[DBD] Лимит лечений исчерпан!", net.kyori.adventure.text.format.NamedTextColor.RED));
            return;
        }

        UUID targetUuid = target.getUniqueId();
        Survivor targetSurvivor = getSurvivorFromPlayer(target);
        if (targetSurvivor == null) return;

        PlayerState targetState = targetSurvivor.getState();
        if (targetState != PlayerState.INJURED && targetState != PlayerState.DOWNED) return;

        boolean selfHeal = healer.getUniqueId().equals(targetUuid);
        if (selfHeal && targetState == PlayerState.DOWNED) return;

        // Range check for other-heal
        if (!selfHeal && healer.getLocation().distance(target.getLocation()) > config.getHealRange()) {
            healer.sendMessage(Component.text("[DBD] Слишком далеко!", net.kyori.adventure.text.format.NamedTextColor.RED));
            return;
        }

        this.healingTarget = target;
        this.isSelfHeal    = selfHeal;
        this.totalHealingTicks = selfHeal
            ? config.getSelfHealSeconds() * 20
            : config.getOtherHealSeconds() * 20;
        this.healingTicks  = totalHealingTicks;

        sendProgressMessage();
    }

    public void tick() {
        if (!isHealing()) return;

        Player healer = controller.getPlayer();
        if (healer == null || healingTarget == null) { cancelHealing(); return; }
        if (!healingTarget.isOnline()) { cancelHealing(); return; }

        Survivor targetSurvivor = getSurvivorFromPlayer(healingTarget);
        if (targetSurvivor == null) { cancelHealing(); return; }

        PlayerState targetState = targetSurvivor.getState();
        if (targetState != PlayerState.INJURED && targetState != PlayerState.DOWNED) {
            completeHealing(targetSurvivor);
            return;
        }

        // Must keep sneaking to heal
        if (!healer.isSneaking()) { cancelHealing(); return; }

        // Range interrupt
        if (!isSelfHeal && healer.getLocation().distance(healingTarget.getLocation()) > config.getHealRange()) {
            cancelHealing();
            return;
        }

        healingTicks--;
        sendProgressMessage();

        if (healingTicks <= 0) completeHealing(targetSurvivor);
    }

    public void cancelHealing() {
        if (healingTarget != null && healingTarget.isOnline() && isHealing()) {
            healingTarget.sendActionBar(Component.empty());
            healingTarget.sendMessage(Component.text("[DBD] Лечение прервано!", net.kyori.adventure.text.format.NamedTextColor.YELLOW));
        }
        healingTarget = null;
        healingTicks  = 0;
    }

    public boolean isHealing() { return healingTicks > 0; }
    public Player getHealingTarget() { return healingTarget; }
    public double getProgress() {
        if (!isHealing()) return 0;
        return 1.0 - ((double) healingTicks / totalHealingTicks);
    }

    // -------------------------------------------------------------------------
    // Private helpers
    // -------------------------------------------------------------------------

    private void completeHealing(Survivor target) {
        PlayerState current  = target.getState();
        PlayerState newState = (current == PlayerState.DOWNED) ? PlayerState.INJURED : PlayerState.HEALTHY;
        target.setState(newState);
        healsUsed++;

        Player targetPlayer = healingTarget;
        if (targetPlayer != null && targetPlayer.isOnline()) {
            String msg = newState == PlayerState.HEALTHY
                ? "<green>Вы полностью вылечились!"
                : "<yellow>Вы встали на ноги!";
            targetPlayer.sendMessage(MiniMessage.miniMessage().deserialize(msg));
        }

        Player healer = controller.getPlayer();
        if (healer != null && !healer.getUniqueId().equals(targetPlayer != null ? targetPlayer.getUniqueId() : null)) {
            healer.sendMessage(Component.text("[DBD] Союзник вылечен!", net.kyori.adventure.text.format.NamedTextColor.GREEN));
        }

        cancelHealing();
    }

    private void sendProgressMessage() {
        if (healingTarget == null) return;
        double progress = 1.0 - ((double) healingTicks / totalHealingTicks);
        String bar = renderProgressBar(progress);
        Component message = MiniMessage.miniMessage().deserialize(
            isSelfHeal ? "<gray>Лечение себя: " + bar
                       : "<gray>Лечение союзника: " + bar
        );
        healingTarget.sendActionBar(message);
        // Also show on healer
        Player healer = controller.getPlayer();
        if (healer != null && !healer.equals(healingTarget)) {
            healer.sendActionBar(message);
        }
    }

    private String renderProgressBar(double progress) {
        int filled = (int)(10 * progress);
        int empty  = 10 - filled;
        return "<green>" + "█".repeat(filled) + "<gray>" + "░".repeat(empty)
            + " <white>" + (int)(progress * 100) + "%";
    }

    private Survivor getSurvivorFromPlayer(Player player) {
        // Self: return controller's survivor
        if (controller.getPlayer() != null && controller.getPlayer().equals(player)) {
            return controller.getSurvivor();
        }
        // Other survivor: use lookup function
        if (survivorLookup != null) {
            return survivorLookup.apply(player);
        }
        return null;
    }
}