package de.fussball.plugin.stats;

import de.fussball.plugin.Fussball;
import org.bukkit.configuration.file.FileConfiguration;
import org.bukkit.configuration.file.YamlConfiguration;

import java.io.File;
import java.io.IOException;
import java.util.*;

/**
 * Verwaltet persistente Spielerstatistiken in stats.yml.
 * Gespeichert werden: Tore, Schüsse, Siege, Niederlagen, Unentschieden, gespielte Spiele.
 */
public class StatsManager {

    private final Fussball plugin;
    private final File statsFile;
    private FileConfiguration statsConfig;

    // In-Memory-Cache für schnellen Zugriff
    private final Map<UUID, PlayerStats> cache = new HashMap<>();

    public StatsManager(Fussball plugin) {
        this.plugin = plugin;
        this.statsFile = new File(plugin.getDataFolder(), "stats.yml");
        load();
    }

    // ── Persistenz ──────────────────────────────────────────────────────────

    private void load() {
        if (!statsFile.exists()) {
            try { statsFile.createNewFile(); } catch (IOException e) { e.printStackTrace(); }
        }
        statsConfig = YamlConfiguration.loadConfiguration(statsFile);
        cache.clear();
        if (statsConfig.contains("players")) {
            for (String uuidStr : statsConfig.getConfigurationSection("players").getKeys(false)) {
                try {
                    UUID uuid = UUID.fromString(uuidStr);
                    String path = "players." + uuidStr;
                    PlayerStats stats = new PlayerStats(
                        statsConfig.getString(path + ".name", "Unbekannt"),
                        statsConfig.getInt(path + ".goals",    0),
                        statsConfig.getInt(path + ".kicks",    0),
                        statsConfig.getInt(path + ".wins",     0),
                        statsConfig.getInt(path + ".losses",   0),
                        statsConfig.getInt(path + ".draws",    0),
                        statsConfig.getInt(path + ".games",    0),
                        statsConfig.getInt(path + ".assists",  0),
                        statsConfig.getInt(path + ".ownGoals", 0)
                    );
                    cache.put(uuid, stats);
                } catch (IllegalArgumentException ignored) {}
            }
        }
        plugin.getLogger().info("[Fussball] Statistiken geladen: " + cache.size() + " Spieler.");
    }

    public void save() {
        statsConfig.set("players", null);
        for (Map.Entry<UUID, PlayerStats> entry : cache.entrySet()) {
            String path = "players." + entry.getKey();
            PlayerStats s = entry.getValue();
            statsConfig.set(path + ".name",     s.name);
            statsConfig.set(path + ".goals",    s.goals);
            statsConfig.set(path + ".kicks",    s.kicks);
            statsConfig.set(path + ".wins",     s.wins);
            statsConfig.set(path + ".losses",   s.losses);
            statsConfig.set(path + ".draws",    s.draws);
            statsConfig.set(path + ".games",    s.games);
            statsConfig.set(path + ".assists",  s.assists);
            statsConfig.set(path + ".ownGoals", s.ownGoals);
        }
        try { statsConfig.save(statsFile); } catch (IOException e) { e.printStackTrace(); }
    }

    // ── Datenzugriff ────────────────────────────────────────────────────────

    public PlayerStats getStats(UUID uuid) {
        return cache.computeIfAbsent(uuid, k -> new PlayerStats("Unbekannt", 0, 0, 0, 0, 0, 0, 0, 0));
    }

    public void addGoal(UUID uuid, String name) {
        PlayerStats s = getStats(uuid);
        s.name = name;
        s.goals++;
        save();
    }

    public void addOwnGoal(UUID uuid, String name) {
        PlayerStats s = getStats(uuid);
        s.name = name;
        s.ownGoals++;
        save();
    }

    public void addAssist(UUID uuid, String name) {
        PlayerStats s = getStats(uuid);
        s.name = name;
        s.assists++;
        save();
    }

    public void addGameResult(UUID uuid, String name, GameResult result) {
        PlayerStats s = getStats(uuid);
        s.name = name;
        s.games++;
        switch (result) {
            case WIN   -> s.wins++;
            case LOSS  -> s.losses++;
            case DRAW  -> s.draws++;
        }
        save();
    }

    public void flushKicks(Map<UUID, Integer> kicks, Map<UUID, String> names) {
        for (Map.Entry<UUID, Integer> entry : kicks.entrySet()) {
            PlayerStats s = getStats(entry.getKey());
            if (names.containsKey(entry.getKey())) s.name = names.get(entry.getKey());
            s.kicks += entry.getValue();
        }
        save();
    }

    public boolean resetStats(UUID uuid) {
        boolean removed = cache.remove(uuid) != null;
        if (!removed) {
            return false;
        }
        save();
        return true;
    }

    public int resetAllStats() {
        int count = cache.size();
        if (count == 0) {
            return 0;
        }
        cache.clear();
        save();
        return count;
    }

    public UUID findPlayerUuidByName(String playerName) {
        for (Map.Entry<UUID, PlayerStats> entry : cache.entrySet()) {
            if (entry.getValue().name != null && entry.getValue().name.equalsIgnoreCase(playerName)) {
                return entry.getKey();
            }
        }
        return null;
    }

    /** Gibt die Top-N-Torschützen zurück, sortiert nach Toren */
    public List<Map.Entry<UUID, PlayerStats>> getTopScorers(int limit) {
        List<Map.Entry<UUID, PlayerStats>> list = new ArrayList<>(cache.entrySet());
        list.sort((a, b) -> b.getValue().goals - a.getValue().goals);
        return list.subList(0, Math.min(limit, list.size()));
    }

    /** Gibt die Top-N-Spieler nach Siegen zurück */
    public List<Map.Entry<UUID, PlayerStats>> getTopWins(int limit) {
        List<Map.Entry<UUID, PlayerStats>> list = new ArrayList<>(cache.entrySet());
        list.sort((a, b) -> b.getValue().wins - a.getValue().wins);
        return list.subList(0, Math.min(limit, list.size()));
    }

    // ── Innere Klassen ───────────────────────────────────────────────────────

    public static class PlayerStats {
        public String name;
        public int goals, kicks, wins, losses, draws, games, assists, ownGoals;

        public PlayerStats(String name, int goals, int kicks, int wins, int losses, int draws, int games, int assists, int ownGoals) {
            this.name = name; this.goals = goals; this.kicks = kicks;
            this.wins = wins; this.losses = losses; this.draws = draws; this.games = games;
            this.assists = assists; this.ownGoals = ownGoals;
        }

        public double getWinRate() {
            if (games == 0) return 0.0;
            return (double) wins / games * 100.0;
        }
    }

    public enum GameResult { WIN, LOSS, DRAW }
}