package de.mviper.adventskalender;

import me.clip.placeholderapi.expansion.PlaceholderExpansion;
import org.bukkit.entity.Player;
import org.jetbrains.annotations.NotNull;

import java.util.HashSet;
import java.util.Optional;
import java.util.Set;
import java.util.UUID;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Platzhalter: %ak_claimed%, %ak_day%, %ak_has_claimed_today%, %ak_remaining%, %ak_is_global%, %ak_event%
 * beziehen sich auf das laufende Event (sonst das erste aktivierte). Mit Event-Präfix, z.B.
 * %ak_halloween_claimed%, gilt der Platzhalter für genau dieses Event.
 */
public class AdventCalendarExpansion extends PlaceholderExpansion {

    private static final long CACHE_MILLIS = 5000L;

    private record Cached(Set<Integer> days, long time) {}

    // Kurzer Cache, damit Scoreboards/Hologramme die Datenbank nicht jede Sekunde abfragen
    private final ConcurrentHashMap<String, Cached> cache = new ConcurrentHashMap<>();

    @Override
    public @NotNull String getIdentifier() {
        return "ak";
    }

    @Override
    public @NotNull String getAuthor() {
        return "M_Viper";
    }

    @Override
    public @NotNull String getVersion() {
        return Adventskalender.getInstance().getDescription().getVersion();
    }

    @Override
    public boolean persist() {
        return true; // Expansion bleibt nach PAPI-Reload registriert
    }

    private Set<Integer> claimedDays(Player player, CalendarEvent ev) {
        long now = System.currentTimeMillis();
        String key = player.getUniqueId() + ":" + ev.getId();
        Cached c = cache.get(key);
        if (c != null && now - c.time() < CACHE_MILLIS) return c.days();
        Set<Integer> days = DataHandler.getViewClaimedDays(player, ev);
        if (days == null) days = new HashSet<>();
        cache.put(key, new Cached(days, now));
        return days;
    }

    private record CachedBirthday(Optional<DataHandler.Birthday> birthday, long time) {}

    private final ConcurrentHashMap<UUID, CachedBirthday> birthdayCache = new ConcurrentHashMap<>();

    private String birthdayPlaceholder(Player player, boolean activeOnly) {
        long now = System.currentTimeMillis();
        CachedBirthday c = birthdayCache.get(player.getUniqueId());
        if (c == null || now - c.time() >= CACHE_MILLIS * 6) {
            try {
                c = new CachedBirthday(DataHandler.getBirthday(player.getUniqueId()), now);
            } catch (DataHandler.DataException e) {
                return activeOnly ? "Nein" : "-";
            }
            birthdayCache.put(player.getUniqueId(), c);
        }
        if (c.birthday().isEmpty()) return activeOnly ? "Nein" : "-";
        DataHandler.Birthday b = c.birthday().get();
        if (!activeOnly) return BirthdayManager.format(b.month(), b.day());
        Integer year = BirthdayManager.activeYear(b.month(), b.day(),
                java.time.LocalDate.now(Adventskalender.getInstance().getZone()));
        return (year != null && b.claimedYear() < year) ? "Ja" : "Nein";
    }

    @Override
    public String onPlaceholderRequest(Player player, String identifier) {
        if (player == null) return "";

        String id = identifier.toLowerCase();

        // %ak_birthday% - eingetragener Geburtstag (TT.MM.) oder "-"
        // %ak_birthday_active% - "Ja", wenn das Geburtstagsgeschenk gerade abholbar ist
        if (id.equals("birthday") || id.equals("birthday_active")) {
            return birthdayPlaceholder(player, id.equals("birthday_active"));
        }

        CalendarEvent ev = null;

        // Optionales Event-Präfix, z.B. "halloween_claimed"
        for (CalendarEvent candidate : EventManager.all()) {
            if (id.startsWith(candidate.getId() + "_")) {
                ev = candidate;
                id = id.substring(candidate.getId().length() + 1);
                break;
            }
        }
        if (ev == null) ev = EventManager.defaultEvent();
        if (ev == null) return "";

        int currentDay = ev.currentDay();

        switch (id) {

            // %ak_event% - ID des Events
            case "event":
                return ev.getId();

            // %ak_claimed% - Anzahl der bereits geöffneten Türchen
            case "claimed":
                return String.valueOf(claimedDays(player, ev).size());

            // %ak_day% - Der aktuelle Tag des Kalenders
            case "day":
                return String.valueOf(currentDay);

            // %ak_has_claimed_today% - Gibt "Ja" oder "Nein" zurück, ob heute schon geöffnet wurde
            case "has_claimed_today":
                if (currentDay == 0) return "Keine Adventszeit";
                return claimedDays(player, ev).contains(currentDay) ? "Ja" : "Nein";

            // %ak_remaining% - Wie viele Türchen sind noch offen?
            case "remaining":
                return String.valueOf(ev.getDays() - claimedDays(player, ev).size());

            // %ak_is_global% - Zeigt an, ob der globale Modus aktiv ist
            case "is_global":
                return ev.isGlobal() ? "Global" : "Spieler-basiert";
        }

        return null; // Placeholder unbekannt
    }
}