package eric.Roullette.websocket;

import com.fasterxml.jackson.databind.JsonNode;
import eric.Roullette.service.GameService;
//import eric.Roullette.service.SpotifyAuthService;
import eric.Roullette.util.JsonUtil;
import io.javalin.websocket.WsConfig;
import io.javalin.websocket.WsContext;

import java.util.*;
import java.util.concurrent.ConcurrentHashMap;

/**
 * WebSocket-Handler für Spiel-Sessions. Verwaltet Spieler-Sessions,
 * broadcastet Spieler-Listen, Runden-Starts und Rundenergebnisse.
 */
public class GameWebSocketHandler {

    private final GameService service;
    //private final SpotifyAuthService authService;

    // Spiel-ID → (Username → deren Guess)
    private final Map<String, Map<String, String>> currentGuesses = new ConcurrentHashMap<>();

    private final Map<String, List<String>> trackInfoCache = new ConcurrentHashMap<>();
    private final Map<String, List<String>> allTracksCache = new ConcurrentHashMap<>();
    //Map<gameId, Map<player, List<String>>
    private Map<String, Map<String, List<String>>> playerTracksCache = new ConcurrentHashMap<>();
    private Map<String, Map<String, List<String>>> playerTrackInfoCache = new ConcurrentHashMap<>();

    public GameWebSocketHandler(GameService gameService) {
        this.service = gameService;
        //this.authService = authService;
    }

    /**
     * Registriert Connect/Close/Message-Handler für eine WebSocket-Route.
     */
    public void register(WsConfig ws) {

        // Neue Connection
        ws.onConnect(ctx -> {
            String gameId   = ctx.pathParam("gameId");
            String username = ctx.queryParam("username");
            // Spiel- und Session-Registrierung
            service.addPlayer(gameId, username);
            // Alle Clients über neue Spielerliste informieren
            service.registerSession(gameId, ctx);
            service.broadcastPlayers(gameId);
        });

        // Connection geschlossen
        ws.onClose(ctx -> {
            String gameId = ctx.pathParam("gameId");
            service.removeSession(gameId, ctx);
        });

        // Eingehende Nachrichten (Guesses & Player-Requests)
        ws.onMessage(ctx -> {
            String gameId = ctx.pathParam("gameId");
            JsonNode node = JsonUtil.fromJson(ctx.message(), JsonNode.class);
            String type = node.get("type").asText();

            switch (type) {
                case "guess" -> {
                    String user = node.get("username").asText();
                    String guess = node.get("guess").asText();
                    // Guess speichern
                    currentGuesses
                            .computeIfAbsent(gameId, id -> new ConcurrentHashMap<>())
                            .put(user, guess);
                    // Wenn alle getippt haben, Ergebnis broadcasten
                    int numPlayers = service.getOrCreateGame(gameId).players().size();
                    if (currentGuesses.get(gameId).size() == numPlayers) {
                        broadcastRoundResult(gameId);
                    }
                }
                case "requestPlayers" -> service.broadcastPlayers(gameId);

                case "next-round" -> {
                    nextround(gameId);
                }
                case "start-round" -> {
                    var currentGame = service.getOrCreateGame(gameId);
                    if (currentGame.players().isEmpty()) return;
                   // Tracks pro Spieler sammeln
                    Map<String, List<String>> allPlayerTracks = currentGame.playerTracks();
                    // alle tracks sammeln
                    List<String> allTracks = allPlayerTracks.values().stream()
                        .flatMap(List::stream)
                        .toList();
                    System.out.println("AlltracksCache für Spiel " + gameId + " hat " + allTracks.size() + " Songs (rundenstart)");
                    if (!allTracks.isEmpty()) {
                        service.startRound(gameId, allTracks);
                    }
                    // Trackinfos für alle Spieler sammeln
                    Map<String, List<String>> allTrackInfos = service.getTrackInfos(allPlayerTracks);
                    // Cache für Trackinfos pro Spiel-ID
                    playerTrackInfoCache.put(gameId, allTrackInfos);
                    System.out.println("TrackInfosCache für Spiel " + gameId + " hat " + allTrackInfos.size() + " Spieler (rundenstart)");
                    broadcastRoundStart(gameId);
                }
            }
        });
    }

    public void nextround(String gameId) {
        var game = service.getOrCreateGame(gameId);
        if (game.players().isEmpty()) return;
        // Songs von allen Spielern sammeln
        List<String> allTracks = new ArrayList<>();
        for (String player : game.players()) {
            allTracks.addAll(game.playerTracks().getOrDefault(player, List.of()));
        }
        if (allTracks.isEmpty()) {
            // TODO: Fehler an Client senden, dass keine Songs da sind
            return;
        }
        // TODO funktionalität bei neu joinenden Spielern überprüfen
        // Runde im Service starten, um Song und Owner zu setzen
        service.startRound(gameId, allTracks);
        // Jetzt Broadcast mit den aktuellen Daten
        broadcastRoundStart(gameId);
    }
    // ----- Broadcast-Methoden -----

    /** Broadcastet den Runden-Start (Song + Optionen) an alle Clients. */
   public void broadcastRoundStart(String gameId) {
        var game = service.getOrCreateGame(gameId);
        List<String> opts = game.players();
        String songUri = game.currentSong();
        List<String> allTracks = game.allTracks();
       Map<String, List<String>> trackInfos = playerTrackInfoCache.get(gameId);
        // Cache pro Spiel-ID nutzen

        String msg = JsonUtil.toJson(Map.of(
                "type",         "round-start",
                "ownerOptions", opts,
                "songUri",      songUri,
                "allTracks",    allTracks,
                "trackInfos",   trackInfos
        ));
        broadcastToAll(gameId, msg);
    }

    /** Broadcastet das Rundenergebnis (Scores, wer richtig, wer getippt hat). */
// Punkte für alle Guess-Teilnehmer anpassen
private void broadcastRoundResult(String gameId) {
    var game    = service.getOrCreateGame(gameId);
    Map<String,Integer> scores = game.scores();
    Map<String,String> guesses = currentGuesses.remove(gameId);
    String owner   = game.currentOwner();

    // Für jeden Tippenden Score anpassen
    for (Map.Entry<String, String> entry : guesses.entrySet()) {
        String guesser = entry.getKey();
        boolean correct = owner.equals(entry.getValue());
        scores.merge(guesser, correct ? 3 : -1, Integer::sum);
    }

    String msg = JsonUtil.toJson(Map.of(
        "type",    "round-result",
        "scores",  scores,
        "guesses", guesses,
        "owner",   owner
    ));
    broadcastToAll(gameId, msg);

    // Prüfe auf Gewinner
    String winner = scores.entrySet().stream()
            .filter(e -> e.getValue() >= 30)
            .map(Map.Entry::getKey)
            .findFirst()
            .orElse(null);
    if (winner != null) {
        // Broadcast an alle, dass das Spiel vorbei ist
        String winMsg = JsonUtil.toJson(Map.of(
                "type", "game-end",
                "winner", winner,
                "scores", scores
        ));
        broadcastToAll(gameId, winMsg);
        game.scores().replaceAll((user , pts) -> 0); // Reset Scores für alle Spieler

    }else{
        // nächste Runde starten
        // ...
//        new Thread(() -> {
//            try { Thread.sleep(2000); } catch (InterruptedException ignored) {}
//            nextround(gameId);
//        }).start();
    }
}

    /** Hilfsmethode: Sendet eine Nachricht an alle WebSocket-Sessions eines Spiels. */
    private void broadcastToAll(String gameId, String msg) {
        // Holt alle WsContext, die der Service beim Connect registriert hat
        Set<WsContext> sessions = service.getSessions(gameId);
        if (sessions == null) return;
        sessions.stream()
                .filter(s -> s.session.isOpen())
                .forEach(ctx -> {
                    try {
                        ctx.send(msg);
                    } catch (Exception ignore) {}
                });
    }

}