package dev.loki.objective;

import dev.loki.mdbd;
import dev.loki.util.TextUtil;
import org.bukkit.Location;
import org.bukkit.entity.ArmorStand;
import org.bukkit.entity.Display;
import org.bukkit.entity.EntityType;
import org.bukkit.entity.TextDisplay;
import org.bukkit.scheduler.BukkitTask;

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

/**
 * Floating labels above generators (name + repair progress).
 * Uses TextDisplay (Paper 1.19.4+) with ArmorStand fallback for older versions.
 */
public class GeneratorHologram {

    private final mdbd plugin;
    private final GeneratorManager manager;
    private final Map<Integer, Object> displays = new HashMap<>(); // TextDisplay or ArmorStand
    private BukkitTask task;
    private boolean useTextDisplay;

    public GeneratorHologram(mdbd plugin, GeneratorManager manager) {
        this.plugin = plugin;
        this.manager = manager;
        this.useTextDisplay = isTextDisplayAvailable();
    }

    private static boolean isTextDisplayAvailable() {
        try {
            EntityType.valueOf("TEXT_DISPLAY");
            return true;
        } catch (IllegalArgumentException e) {
            return false;
        }
    }

    public void start() {
        stop();
        spawnAll();
        task = plugin.getServer().getScheduler().runTaskTimer(plugin, this::refresh, 20L, 20L);
        plugin.getLogger().info("[GeneratorHologram] Started with " + displays.size() + " holograms (mode=" + (useTextDisplay ? "TextDisplay" : "ArmorStand") + ")");
    }

    public void stop() {
        if (task != null) {
            task.cancel();
            task = null;
        }
        for (Object display : displays.values()) {
            if (display instanceof TextDisplay td && td.isValid()) {
                td.remove();
            } else if (display instanceof ArmorStand as && as.isValid()) {
                as.remove();
            }
        }
        displays.clear();
    }

    private void spawnAll() {
        double heightOffset = plugin.getConfigManager().getGame().getGeneratorHologramHeightOffset();
        for (Generator gen : manager.getAllGenerators()) {
            Location loc = gen.getLocation();
            if (loc.getWorld() == null) continue;

            Location holoLoc = loc.clone().add(0.5, 2.0 + heightOffset, 0.5);
            try {
                if (useTextDisplay) {
                    TextDisplay display = loc.getWorld().spawn(holoLoc, TextDisplay.class, d -> {
                        d.setBillboard(Display.Billboard.VERTICAL);
                        d.setSeeThrough(false);
                        d.setShadowed(true);
                        d.setDefaultBackground(false);
                        d.setPersistent(false);
                        d.setTextOpacity((byte) -1);
                    });
                    displays.put(gen.getId(), display);
                } else {
                    ArmorStand stand = loc.getWorld().spawn(holoLoc, ArmorStand.class, as -> {
                        as.setInvisible(true);
                        as.setInvulnerable(true);
                        as.setGravity(false);
                        as.setMarker(true);
                        as.setCustomNameVisible(true);
                        as.setPersistent(false);
                    });
                    displays.put(gen.getId(), stand);
                }
            } catch (Exception e) {
                plugin.getLogger().warning("[GeneratorHologram] Failed to spawn hologram for generator " + gen.getId() + ": " + e.getMessage());
            }
        }
    }

    private void refresh() {
        double heightOffset = plugin.getConfigManager().getGame().getGeneratorHologramHeightOffset();
        int total = manager.getTotalCount();
        for (Generator gen : manager.getAllGenerators()) {
            Object display = displays.get(gen.getId());
            if (display == null) continue;

            boolean valid = (display instanceof TextDisplay td && td.isValid()) ||
                          (display instanceof ArmorStand as && as.isValid());
            if (!valid) continue;

            int pct = (int) gen.getProgress();
            String bar = buildBar(pct);
            String text;
            if (gen.isCompleted()) {
                text = "§6⚙ Генератор §f#" + (gen.getId() + 1) + "/" + total + "\n§a✔ Починен!";
            } else if (gen.isUnderRegression()) {
                text = "§6⚙ Генератор §f#" + (gen.getId() + 1) + "/" + total + "\n§c↓ " + bar + " §f" + pct + "%";
            } else {
                text = "§6⚙ Генератор §f#" + (gen.getId() + 1) + "/" + total + "\n§e" + bar + " §f" + pct + "%";
            }

            Location base = gen.getLocation().clone().add(0.5, 2.0 + heightOffset, 0.5);

            if (display instanceof TextDisplay td) {
                td.text(TextUtil.color(text));
                td.teleport(base);
            } else if (display instanceof ArmorStand as) {
                as.setCustomName(text);
                as.teleport(base);
            }
        }
    }

    private String buildBar(int pct) {
        int filled = pct / 10;
        int empty = 10 - filled;
        return "§e" + "█".repeat(Math.max(0, filled)) + "§7" + "░".repeat(Math.max(0, empty));
    }
}