/* ============================================================
   sockets/arena.js
   Alle Socket-Events rund um 1v1 Matchmaking, Spielfeld & Bereit-System
============================================================ */

const waitingPool = new Map(); // socketId → { socket, player }
const LEVEL_RANGE = 5;

// Werden beim ersten Event lazy initialisiert (auf io gespeichert)
// io._arenaRooms  → matchId → { sockets, names }
// io._arenaReady  → matchId → Set of ready slots
// io._arenaTimers → matchId → intervalId

const READY_TIMEOUT = 30; // Sekunden bis Match abgebrochen wird

function startReadyTimer(io, matchId) {
  if (!io._arenaTimers) io._arenaTimers = new Map();
  if (io._arenaTimers.has(matchId)) return; // läuft bereits

  let remaining = READY_TIMEOUT;

  // Sofort ersten Tick senden
  io.to("arena_" + matchId).emit("ready_timer", { remaining });

  const interval = setInterval(() => {
    remaining--;
    io.to("arena_" + matchId).emit("ready_timer", { remaining });

    if (remaining <= 0) {
      clearInterval(interval);
      io._arenaTimers.delete(matchId);

      // Match abbrechen – Funktion noch offen
      console.log(`[1v1] Match ${matchId} abgebrochen – Zeit abgelaufen.`);
      io.to("arena_" + matchId).emit("match_cancelled", {
        reason: "timeout",
        message: "Zeit abgelaufen – Match wird abgebrochen.",
      });
    }
  }, 1000);

  io._arenaTimers.set(matchId, interval);
}

function stopReadyTimer(io, matchId) {
  if (!io._arenaTimers) return;
  const interval = io._arenaTimers.get(matchId);
  if (interval) {
    clearInterval(interval);
    io._arenaTimers.delete(matchId);
    console.log(`[1v1] Timer für Match ${matchId} gestoppt (beide bereit).`);
  }
}

function tryMatchmaking(io, newSocketId) {
  const challenger = waitingPool.get(newSocketId);
  if (!challenger) return;

  for (const [id, entry] of waitingPool) {
    if (id === newSocketId) continue;

    const levelDiff = Math.abs(entry.player.level - challenger.player.level);
    if (levelDiff <= LEVEL_RANGE) {
      waitingPool.delete(newSocketId);
      waitingPool.delete(id);

      const matchId = `match_${Date.now()}_${Math.random().toString(36).slice(2, 7)}`;

      challenger.socket.emit("match_found", {
        matchId,
        opponent: entry.player,
        mySlot: "player1",
      });

      entry.socket.emit("match_found", {
        matchId,
        opponent: challenger.player,
        mySlot: "player2",
      });

      console.log(
        `[1v1] Match: ${challenger.player.name} (Lvl ${challenger.player.level})` +
        ` vs ${entry.player.name} (Lvl ${entry.player.level}) | ${matchId}`
      );
      return;
    }
  }
}

function registerArenaHandlers(io, socket) {

  /* ── Queue beitreten ── */
  socket.on("join_1v1", (playerData) => {
    if (waitingPool.has(socket.id)) return;

    const player = {
      id:    playerData.id,
      name:  playerData.name,
      level: Number(playerData.level) || 1,
    };

    waitingPool.set(socket.id, { socket, player });

    socket.emit("queue_status", {
      status:   "waiting",
      poolSize: waitingPool.size,
      message:  `Suche Gegner (Level ${player.level - LEVEL_RANGE}–${player.level + LEVEL_RANGE})…`,
    });

    console.log(`[1v1] ${player.name} (Lvl ${player.level}) im Pool. Größe: ${waitingPool.size}`);
    tryMatchmaking(io, socket.id);
  });

  /* ── Queue verlassen ── */
  socket.on("leave_1v1", () => {
    if (waitingPool.delete(socket.id)) {
      socket.emit("queue_status", { status: "left" });
      console.log(`[1v1] ${socket.id} hat Pool verlassen.`);
    }
  });

  /* ── Spielfeld: Spieler betritt Arena-Room ── */
  socket.on("arena_join", (data) => {
    const { matchId, slot } = data;
    if (!matchId || !slot) return;

    if (!io._arenaRooms) io._arenaRooms = new Map();
    if (!io._arenaRooms.has(matchId)) {
      io._arenaRooms.set(matchId, { sockets: {}, names: {} });
    }

    const room = io._arenaRooms.get(matchId);
    room.sockets[slot] = socket.id;
    room.names[slot]   = socket.user || "Spieler";

    socket.join("arena_" + matchId);

    const otherSlot = slot === "player1" ? "player2" : "player1";

    if (room.sockets[otherSlot]) {
      io.to("arena_" + matchId).emit("arena_ready", {
        player1: room.names["player1"] || "Spieler 1",
        player2: room.names["player2"] || "Spieler 2",
      });
      console.log(`[Arena] Match ${matchId} bereit: ${room.names["player1"]} vs ${room.names["player2"]}`);

      // 30-Sekunden Bereit-Timer starten
      startReadyTimer(io, matchId);
    } else {
      socket.to("arena_" + matchId).emit("arena_opponent_joined", {
        name: room.names[slot],
        slot,
      });
    }
  });

  /* ── Bereit-System ── */
  socket.on("player_ready", (data) => {
    const { matchId, slot } = data;
    if (!matchId || !slot) return;

    if (!io._arenaReady) io._arenaReady = new Map();
    if (!io._arenaReady.has(matchId)) {
      io._arenaReady.set(matchId, new Set());
    }

    const readySet = io._arenaReady.get(matchId);
    readySet.add(slot);

    io.to("arena_" + matchId).emit("ready_status", {
      readyCount: readySet.size,
      readySlots: Array.from(readySet),
    });

    console.log(`[1v1] ${slot} bereit in ${matchId} (${readySet.size}/2)`);

    if (readySet.size >= 2) {
      stopReadyTimer(io, matchId);
      io._arenaReady.delete(matchId);
    }
  });

  /* ── Aufgeben ── */
  socket.on("player_surrender", (data) => {
    const { matchId, slot } = data;
    console.log(`[1v1] ${slot} hat aufgegeben in Match ${matchId}`);
    // Aufgabe-Logik kommt hier rein
    io.to("arena_" + matchId).emit("player_surrendered", { slot });
  });

  /* ── Disconnect: aus Pool entfernen ── */
  socket.on("disconnect", () => {
    if (waitingPool.delete(socket.id)) {
      console.log(`[1v1] ${socket.id} disconnected – aus Pool entfernt.`);
    }
  });
}

module.exports = { registerArenaHandlers };