const express = require("express");
const router  = express.Router();
const db      = require("../database/database");

/* ========================
   Login Middleware (lokal)
======================== */

function requireLogin(req, res, next) {
  if (!req.session.user) {
    return res.status(401).json({ error: "Nicht eingeloggt" });
  }
  next();
}

/* ========================
   HELPER: Spieler-Stats laden
======================== */

/* HP-Formel: 20 + (level-1)*2  |  Level 1=20, Level 50=118 */
function calcAvatarHp(level) {
  return 20 + (Math.max(1, Math.min(50, level || 1)) - 1) * 2;
}

async function getPlayerStats(userId) {
  try {
    const [[acc]] = await db.query(
      "SELECT level FROM accounts WHERE id = ?",
      [userId]
    );
    return { hp: calcAvatarHp(acc?.level ?? 1), mana: 3 };
  } catch {
    return { hp: 20, mana: 3 };
  }
}

/* ================================
   Arena Übersicht
   GET /arena
================================ */

router.get("/", (req, res) => {
  res.render("arena", {
    title: "Kampfarena",
  });
});

/* ========================
   GET /arena/me
   Eigene Spielerdaten für Matchmaking
======================== */

router.get("/me", requireLogin, async (req, res) => {
  try {
    const [[account]] = await db.query(
      "SELECT id, ingame_name, level FROM accounts WHERE id = ?",
      [req.session.user.id]
    );
    if (!account) {
      return res.status(404).json({ error: "Spieler nicht gefunden" });
    }
    res.json({
      id:    account.id,
      name:  account.ingame_name || "Unbekannter Held",
      level: account.level || 1,
    });
  } catch (err) {
    console.error("[Arena /me]", err);
    res.status(500).json({ error: "Datenbankfehler" });
  }
});

/* ================================
   1v1 Spielfeld
   GET /arena/1v1
================================ */

router.get("/1v1", requireLogin, async (req, res) => {
  const userId = req.session.user.id;
  const { match: matchId, slot } = req.query;

  // Kein matchId → direkte Vorschau ohne Matchmaking (z.B. für Tests)
  if (!matchId) {
    return res.render("1v1-battlefield", {
      title:       "1v1 Kampf",
      matchId:     null,
      mySlot:      "player1",
      player1:     req.session?.user?.ingame_name || "Spieler 1",
      player2:     "Gegner",
      player1hp:   20,
      player1mana: 3,
      player2hp:   20,
      player2mana: 3,
    });
  }

  try {
    const [[me]]       = await db.query("SELECT ingame_name FROM accounts WHERE id = ?", [userId]);
    const { hp, mana } = await getPlayerStats(userId);
    const isPlayer1    = slot === "player1";

    res.render("1v1-battlefield", {
      title:       "⚔️ 1v1 Kampf",
      matchId,
      mySlot:      slot || "player1",
      player1:     isPlayer1 ? (me?.ingame_name || "Du") : "Gegner",
      player2:     isPlayer1 ? "Gegner" : (me?.ingame_name || "Du"),
      player1hp:   isPlayer1 ? hp   : 20,
      player1mana: isPlayer1 ? mana : 3,
      player2hp:   isPlayer1 ? 20   : hp,
      player2mana: isPlayer1 ? 3    : mana,
    });
  } catch (err) {
    console.error("[Arena /1v1]", err);
    res.status(500).send("Fehler beim Laden des Spielfelds.");
  }
});

/* ================================
   2v2 Spielfeld
   GET /arena/2v2
================================ */

router.get("/2v2", requireLogin, async (req, res) => {
  const userId = req.session.user.id;
  const { match: matchId, slot } = req.query;

  if (!matchId) {
    return res.render("1v1-battlefield", {
      title:       "2v2 Kampf",
      matchId:     null,
      mySlot:      "team1_player1",
      player1:     req.session?.user?.ingame_name || "Spieler 1",
      player2:     "Gegner",
      player1hp:   20,
      player1mana: 3,
      player2hp:   20,
      player2mana: 3,
    });
  }

  try {
    const [[me]]       = await db.query("SELECT ingame_name FROM accounts WHERE id = ?", [userId]);
    const { hp, mana } = await getPlayerStats(userId);

    res.render("1v1-battlefield", {
      title:       "⚔️ 2v2 Kampf",
      matchId,
      mySlot:      slot || "team1_player1",
      player1:     me?.ingame_name || "Du",
      player2:     "Gegner",
      player1hp:   hp,
      player1mana: mana,
      player2hp:   20,
      player2mana: 3,
    });
  } catch (err) {
    console.error("[Arena /2v2]", err);
    res.status(500).send("Fehler beim Laden des Spielfelds.");
  }
});

module.exports = router;