/*
 * RustPad media player helpers.
 * Project-owned code: keeps native video playback and YouTube embeds responsive.
 */

const initialized = new WeakSet();

function createYouTubeFrame(node) {
  const videoId = String(node.dataset.videoId || "").trim();
  if (!/^[A-Za-z0-9_-]{6,20}$/.test(videoId)) return;

  const iframe = document.createElement("iframe");
  iframe.src = `https://www.youtube-nocookie.com/embed/${encodeURIComponent(videoId)}?rel=0&modestbranding=1&playsinline=1`;
  iframe.title = node.dataset.playerTitle || "YouTube video";
  iframe.loading = "lazy";
  iframe.allow = "accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share";
  iframe.referrerPolicy = "strict-origin-when-cross-origin";
  iframe.allowFullscreen = true;
  node.replaceChildren(iframe);
}

function initializeNativeVideo(video) {
  video.controls = true;
  video.playsInline = true;
  video.preload = video.preload || "metadata";

  const fallback = video.closest(".rustpad-media")?.querySelector(".rustpad-media__fallback");
  if (!fallback) return;
  const revealFallback = () => { fallback.hidden = false; };
  video.addEventListener("error", revealFallback, { once: true });
  video.querySelectorAll("source").forEach(source => source.addEventListener("error", revealFallback, { once: true }));
}

export function hydrateMediaPlayers(root = document) {
  root.querySelectorAll("[data-rustpad-player]").forEach(node => {
    if (initialized.has(node)) return;
    initialized.add(node);
    if (node.dataset.playerKind === "youtube") createYouTubeFrame(node);
    else if (node instanceof HTMLVideoElement) initializeNativeVideo(node);
  });
}

export function destroyMediaPlayers(root = document) {
  root.querySelectorAll('[data-rustpad-player][data-player-kind="youtube"] iframe').forEach(frame => {
    frame.src = "about:blank";
  });
}