const DEFAULTS = {
  width: 1920,
  height: 1080,
  scale: 1,
  fit: "contain",
  maxwidth: 500,
  maxheight: 480,
  autoplay: true,
  muted: true,
  transparent: true,
  chroma: "#00ff00",
  readyDelay: 1000,
  maxWait: 10000,
};

let currentReadyTimer;
let currentMaxWaitTimer;
let autoplayTimer;

function toBoolean(value, defaultValue = false) {
  if (value === undefined || value === null || value === "") {
    return defaultValue;
  }

  if (typeof value === "boolean") {
    return value;
  }

  return ["1", "true", "yes", "on"].includes(String(value).toLowerCase());
}

function toNumber(value, defaultValue, min, max) {
  const number = Number(value);

  if (!Number.isFinite(number)) {
    return defaultValue;
  }

  return Math.min(Math.max(number, min), max);
}

function slugify(value = "") {
  return String(value)
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, "-")
    .replace(/^-|-$/g, "") || "unknown";
}

function parseJsonPayload(payload) {
  try {
    const parsed = JSON.parse(payload);

    if (parsed && typeof parsed === "object") {
      return parsed;
    }
  } catch {
    return null;
  }

  return null;
}

function parseXmlPayload(payload) {
  const data = {};
  const documentXml = new DOMParser().parseFromString(payload, "application/xml");

  if (documentXml.querySelector("parsererror")) {
    return data;
  }

  for (const component of documentXml.querySelectorAll("componentData")) {
    const key = component.getAttribute("id");
    const valueNode = component.querySelector("data[id='text'], data[id='value'], data");
    const value = valueNode?.getAttribute("value") || valueNode?.textContent;

    if (key && value) {
      data[key] = value;
    }
  }

  for (const element of documentXml.documentElement.querySelectorAll("*")) {
    if (element.children.length === 0 && element.textContent.trim()) {
      data[element.tagName] = element.textContent.trim();
    }
  }

  return data;
}

function parseUpdatePayload(payload) {
  if (payload && typeof payload === "object") {
    return payload;
  }

  const text = String(payload || "").trim();

  if (!text) {
    return {};
  }

  const json = parseJsonPayload(text);
  if (json) {
    return json;
  }

  if (/^https?:\/\//i.test(text)) {
    return { url: text };
  }

  return parseXmlPayload(text);
}

function normalizeOptions(data) {
  return {
    url: data.url || data.URL || data.link || data.source || "",
    width: toNumber(data.width, DEFAULTS.width, 320, 3840),
    height: toNumber(data.height, DEFAULTS.height, 240, 2160),
    scale: toNumber(data.scale, DEFAULTS.scale, 0.25, 3),
    maxwidth: toNumber(data.maxwidth || data.maxWidth, DEFAULTS.maxwidth, 220, 500),
    maxheight: toNumber(data.maxheight || data.maxHeight, DEFAULTS.maxheight, 220, 2160),
    readyDelay: toNumber(data.readyDelay, DEFAULTS.readyDelay, 0, 30000),
    maxWait: toNumber(data.maxWait, DEFAULTS.maxWait, 1000, 60000),
    fit: data.fit === "cover" ? "cover" : "contain",
    autoplay: toBoolean(data.autoplay, DEFAULTS.autoplay),
    muted: toBoolean(data.muted, DEFAULTS.muted),
    transparent: toBoolean(data.transparent, DEFAULTS.transparent),
    chroma: data.chroma || DEFAULTS.chroma,
  };
}

function addAutoplayToUrl(src, options) {
  try {
    const url = new URL(src, window.location.href);
    url.searchParams.set("autoplay", "1");
    url.searchParams.set("playsinline", "1");

    if (options.muted) {
      url.searchParams.set("mute", "1");
      url.searchParams.set("muted", "1");
    }

    return url.toString();
  } catch {
    return src;
  }
}

function normalizeInsertedMedia(root, options) {
  for (const iframe of root.querySelectorAll("iframe")) {
    const permissions = new Set(
      (iframe.getAttribute("allow") || "")
        .split(";")
        .map((permission) => permission.trim())
        .filter(Boolean),
    );

    permissions.add("autoplay");
    permissions.add("fullscreen");
    permissions.add("picture-in-picture");
    iframe.setAttribute("allow", Array.from(permissions).join("; "));

    if (options.autoplay && iframe.src) {
      iframe.src = addAutoplayToUrl(iframe.src, options);
    }
  }

  for (const video of root.querySelectorAll("video")) {
    video.autoplay = options.autoplay;
    video.playsInline = true;
    video.setAttribute("playsinline", "");

    if (options.autoplay) {
      video.setAttribute("autoplay", "");
    }

    if (options.muted) {
      video.muted = true;
      video.defaultMuted = true;
      video.setAttribute("muted", "");
    }
  }
}

function executeScripts(root) {
  for (const script of root.querySelectorAll("script")) {
    const replacement = document.createElement("script");

    for (const attribute of script.attributes) {
      replacement.setAttribute(attribute.name, attribute.value);
    }

    replacement.textContent = script.textContent;
    script.replaceWith(replacement);
  }
}

function applyStageOptions(options) {
  document.body.style.setProperty("--stage-width", `${options.width}px`);
  document.body.style.setProperty("--stage-height", `${options.height}px`);
  document.body.style.setProperty("--scale", String(options.scale));
  document.body.style.setProperty("--chroma", options.chroma);
  document.body.classList.toggle("transparent", options.transparent);
  document.documentElement.classList.toggle("transparent", options.transparent);

  const stage = document.querySelector<HTMLElement>(".stage");
  if (!stage) {
    return;
  }
  stage.classList.toggle("fit-cover", options.fit === "cover");
  stage.classList.toggle("fit-contain", options.fit !== "cover");
}

function hideUntilReady(options) {
  clearTimeout(currentReadyTimer);
  clearTimeout(currentMaxWaitTimer);

  document.body.classList.remove("is-ready");
  document.body.classList.add("is-loading");

  const reveal = () => {
    document.body.classList.remove("is-loading");
    document.body.classList.add("is-ready");
  };

  currentReadyTimer = setTimeout(reveal, options.readyDelay);
  currentMaxWaitTimer = setTimeout(reveal, options.maxWait);
}

function startAutoplayAssist(root, options) {
  clearInterval(autoplayTimer);

  if (!options.autoplay) {
    return;
  }

  const scan = () => {
    for (const video of root.querySelectorAll("video")) {
      const promise = video.play?.();
      promise?.catch?.(() => {});
    }
  };

  scan();
  autoplayTimer = setInterval(scan, 1000);
}

function renderEmbed(oembed, sourceUrl, options) {
  const embed = document.querySelector<HTMLElement>(".embed");
  if (!embed) {
    return;
  }
  const providerClass = `provider-${slugify(oembed.provider_name)}`;
  const embedWidth = Math.min(Number(oembed.width) || 500, 500);
  const embedHeight = Number(oembed.height);

  embed.className = `embed ${providerClass}`;
  embed.dataset.source = sourceUrl;
  embed.style.setProperty("--embed-width", `${embedWidth}px`);

  if (Number.isFinite(embedHeight) && embedHeight > 0) {
    embed.style.setProperty("--embed-height", `${embedHeight}px`);
  } else {
    embed.style.removeProperty("--embed-height");
  }

  if (oembed.type === "photo" && oembed.url) {
    const image = document.createElement("img");
    image.src = oembed.url;
    image.alt = oembed.title || "";
    embed.replaceChildren(image);
  } else {
    embed.innerHTML = oembed.html || "";
  }

  normalizeInsertedMedia(embed, options);
  executeScripts(embed);
  startAutoplayAssist(embed, options);
  hideUntilReady(options);
}

async function loadEmbed(options) {
  if (!options.url) {
    return;
  }

  applyStageOptions(options);

  const requestUrl = new URL("/api/oembed", window.location.origin);
  requestUrl.searchParams.set("url", options.url);
  requestUrl.searchParams.set("maxwidth", String(options.maxwidth));
  requestUrl.searchParams.set("maxheight", String(options.maxheight));

  const response = await fetch(requestUrl);
  const result = await response.json();

  if (!response.ok) {
    throw new Error(result.error || "Could not load oEmbed data.");
  }

  renderEmbed(result.data, options.url, options);
}

window.update = (payload) => {
  const options = normalizeOptions(parseUpdatePayload(payload));
  loadEmbed(options).catch((error) => {
    console.error(error);
    document.body.classList.remove("is-ready");
    document.body.classList.add("is-loading");
  });
};

window.play = () => {
  document.body.classList.remove("is-loading");
  document.body.classList.add("is-ready");
};

window.stop = () => {
  clearInterval(autoplayTimer);
  document.body.classList.remove("is-ready");
  document.body.classList.add("is-loading");
};