// ============================
// Volume control
// ============================
document.querySelectorAll("audio").forEach((audio) => {
  audio.volume = 0.5;
});

// ============================
// Shuffle (safe)
// ============================
function fisherYatesShuffle(arr) {
  if (!Array.isArray(arr)) return [];

  for (let i = arr.length - 1; i > 0; i--) {
    const j = Math.floor(Math.random() * (i + 1));
    [arr[i], arr[j]] = [arr[j], arr[i]];
  }
  return arr;
}

// ============================
// SAFE FETCH (fixes JSON crash)
// ============================
async function safeFetchJSON(url) {
  try {
    const res = await fetch(url);

    if (!res.ok) {
      console.error("HTTP error:", res.status);
      return null;
    }

    const text = await res.text();

    // Reject non-JSON responses (HTML, error pages, etc.)
    const trimmed = text.trim();
    if (!trimmed || (trimmed[0] !== "{" && trimmed[0] !== "[")) {
      console.error("Non-JSON response detected:", trimmed.slice(0, 120));
      return null;
    }

    return JSON.parse(text);
  } catch (err) {
    console.error("Fetch failed:", err);
    return null;
  }
}

// ============================
// Load music data
// ============================
async function loadMusicData(category = "frutigerAeroBliss") {
  const data = await safeFetchJSON("https://api.veltron.net/music");

  if (!data?.ols || !Array.isArray(data.ols)) {
    console.error("Invalid API structure");
    return [];
  }

  const section =
  data.ols.find((x) => x?.["@id"] === category) || data.ols[0];

  if (!section?.li || !Array.isArray(section.li)) {
    console.error("Missing playlist section");
    return [];
  }

  const baseUrl = "https://cdn.veltron.net/aero";

  const playlist = section.li
  .map((item) => {
    const a = item?.a;
    const mp3 = a?.["@data-src-mp3"];
    const title = a?.title;

    if (!mp3 || !title) return null;

    return {
      title,
      url: baseUrl + mp3.split("/").pop(),
       background: a["@data-background"] || "",
       artist: a["@data-artist"] || "",
       youtube: a["@data-youtube"] || ""
    };
  })
  .filter(Boolean);

  return fisherYatesShuffle(playlist);
}

// ============================
// DOM
// ============================
const NAV_MUSIC = document.getElementById("navMusic");
const BUTTON_PLAY = document.getElementById("navMusicPlay");
const BUTTON_PAUSE = document.getElementById("navMusicPause");
const BUTTON_PREVIOUS = document.getElementById("navMusicPrevious");
const BUTTON_NEXT = document.getElementById("navMusicNext");
const CURRENT_SONG_INFO = document.getElementById("currentSongInfo");

// ============================
// State
// ============================
let songs = [];
let currentIndex = 0;
let isPlaying = false;

// ============================
// Save / Load state
// ============================
function saveState() {
  sessionStorage.setItem("isPlaying", JSON.stringify(isPlaying));
}

function loadState() {
  const saved = sessionStorage.getItem("isPlaying");
  if (saved !== null) isPlaying = JSON.parse(saved);
}

// ============================
// Safe song loader
// ============================
function loadSong(index) {
  if (!Array.isArray(songs) || songs.length === 0) return;
  if (index < 0 || index >= songs.length) return;

  const song = songs[index];
  if (!song?.url) return;

  NAV_MUSIC.src = song.url;
  CURRENT_SONG_INFO.innerText = `Now playing: ${song.title}`;
  NAV_MUSIC.load();
}

// ============================
// UI state
// ============================
function updateUI() {
  BUTTON_PLAY.classList.toggle("active", isPlaying);
  BUTTON_PAUSE.classList.toggle("active", !isPlaying);
}

// ============================
// Controls
// ============================
BUTTON_PLAY.addEventListener("click", () => {
  if (!songs.length) return;

  isPlaying = true;
  NAV_MUSIC.play().catch(() => {});
  updateUI();
  saveState();
});

BUTTON_PAUSE.addEventListener("click", () => {
  isPlaying = false;
  NAV_MUSIC.pause();
  updateUI();
  saveState();
});

BUTTON_PREVIOUS.addEventListener("click", () => {
  if (!songs.length) return;

  currentIndex = currentIndex === 0 ? songs.length - 1 : currentIndex - 1;
  loadSong(currentIndex);

  if (isPlaying) NAV_MUSIC.play().catch(() => {});
  saveState();
});

BUTTON_NEXT.addEventListener("click", () => {
  if (!songs.length) return;

  currentIndex = (currentIndex + 1) % songs.length;
  loadSong(currentIndex);

  if (isPlaying) NAV_MUSIC.play().catch(() => {});
  saveState();
});

// ============================
// Auto next
// ============================
NAV_MUSIC.addEventListener("ended", () => {
  if (!songs.length) return;

  currentIndex = (currentIndex + 1) % songs.length;
  loadSong(currentIndex);

  if (isPlaying) NAV_MUSIC.play().catch(() => {});
  saveState();
});

// ============================
// Init
// ============================
window.addEventListener("load", async () => {
  songs = await loadMusicData("frutigerAeroBliss");

  if (!songs.length) {
    CURRENT_SONG_INFO.innerText = "No music available";
    console.error("Playlist failed to load");
    return;
  }

  loadState();
  loadSong(currentIndex);
  updateUI();

  if (isPlaying) {
    NAV_MUSIC.play().catch(() => {});
  }
});

// ============================
// Prevent multiple audio overlap
// ============================
document.addEventListener(
  "play",
  (e) => {
    const audios = document.getElementsByTagName("audio");

    for (let i = 0; i < audios.length; i++) {
      if (audios[i] !== e.target) {
        audios[i].pause();
      }
    }
  },
  true
);