/* ============================================================
   TAB SHOOTER — Popup (Overlay) Controller
   Nutzt die geteilte engine.js.
   ============================================================ */

import { TabShooterGame, loadTabs, clamp } from "./engine.js";

const CANVAS_W = 420;
const CANVAS_H = 600;

// ---------- DOM ----------
const canvas = document.getElementById("game-canvas");
const screens = {
  start: document.getElementById("start-screen"),
  game: document.getElementById("game-screen"),
  gameover: document.getElementById("gameover-screen"),
  empty: document.getElementById("empty-screen"),
};
const els = {
  hsValue: document.getElementById("hs-value"),
  hudScore: document.getElementById("hud-score"),
  hudLives: document.getElementById("hud-lives"),
  hudTabs: document.getElementById("hud-tabs"),
  hudPowerups: document.getElementById("hud-powerups"),
  resultTabs: document.getElementById("result-tabs"),
  resultScore: document.getElementById("result-score"),
  resultHighscore: document.getElementById("result-highscore"),
  newRecord: document.getElementById("new-record"),
};

// ---------- STATE ----------
let game = null;
let highscore = 0;
let selectedScope = "current";

// Merke dir den Tab, von dem aus das Popup geöffnet wurde (den aktiven Tab
// im zuletzt fokussierten Fenster). Wird dieser Tab geschlossen, reißt Chrome
// auch das Popup mit sich -> Spiel beendet sich ohne Vorwarnung. Wir schließen
// ihn daher per excludeTabId von der Zielliste aus.
let openerTabId = null;
chrome.tabs.query({ active: true, currentWindow: true }, (tabs) => {
  if (tabs && tabs[0]) openerTabId = tabs[0].id;
});

// ---------- SCREEN HELPERS ----------
function showScreen(name) {
  Object.values(screens).forEach((s) => s.classList.remove("visible"));
  screens[name].classList.add("visible");
}

// ---------- HIGHSCORE ----------
async function loadHighscore() {
  const data = await chrome.storage.local.get("highscore");
  highscore = data.highscore || 0;
  els.hsValue.textContent = highscore;
}
async function saveHighscore(value) {
  await chrome.storage.local.set({ highscore: value });
  highscore = value;
}

// ---------- HUD CALLBACKS ----------
const hudCallbacks = {
  onScore: (s) => (els.hudScore.textContent = s),
  onLives: (l) => (els.hudLives.textContent = "❤️".repeat(Math.max(0, l))),
  onTabs: (t) => (els.hudTabs.textContent = t),
  onPowerups: (g) => {
    let html = "";
    if (g.shield > 0) html += "🛡️";
    if (g.tripleShot > 0) html += "🔫";
    if (g.rapidFire > 0) html += "⚡";
    els.hudPowerups.innerHTML = html;
  },
  onGameOver: ({ score }) => {
    const isNewRecord = score > highscore;
    if (isNewRecord) saveHighscore(score);
    els.resultTabs.textContent = game.tabsDestroyed;
    els.resultScore.textContent = score;
    els.resultHighscore.textContent = Math.max(highscore, score);
    els.newRecord.classList.toggle("hidden", !isNewRecord);
    showScreen("gameover");
  },
};

// ---------- GAME START ----------
async function startNewGame() {
  // Den Opener-Tab (aktuellen Tab, der das Popup trägt) nie als Ziel zulassen,
  // da sein Schließen das Popup und damit das Spiel sofort beenden würde.
  const tabs = await loadTabs(selectedScope, openerTabId);
  if (tabs.length === 0) {
    showScreen("empty");
    return;
  }
  showScreen("game");
  els.hudScore.textContent = "0";
  els.hudLives.textContent = "❤️❤️❤️";
  els.hudTabs.textContent = tabs.length;
  els.hudPowerups.innerHTML = "";

  game = new TabShooterGame(canvas, {}, hudCallbacks);
  await game.init(tabs);
  game.start();
}

// ---------- EVENT WIRING ----------
document.querySelectorAll(".scope-btn").forEach((btn) => {
  btn.addEventListener("click", () => {
    document.querySelectorAll(".scope-btn").forEach((b) => b.classList.remove("active"));
    btn.classList.add("active");
    selectedScope = btn.dataset.scope;
  });
});

document.getElementById("start-btn").addEventListener("click", startNewGame);
document.getElementById("replay-btn").addEventListener("click", startNewGame);

document.getElementById("menu-btn").addEventListener("click", () => {
  if (game) game.stop();
  loadHighscore();
  showScreen("start");
});
document.getElementById("empty-menu-btn").addEventListener("click", () => {
  loadHighscore();
  showScreen("start");
});

// ---------- FULLSCREEN BUTTON ----------
document.getElementById("fullscreen-btn").addEventListener("click", async () => {
  // Open the fullscreen game in a new tab. The popup will close automatically.
  await chrome.tabs.create({ url: chrome.runtime.getURL("game.html") });
  window.close();
});

// ---------- INIT ----------
loadHighscore();