/* global document window */

window.addEventListener("DOMContentLoaded", async () => {
  const loop = async () => {
    const listen = await getCurrentListen();
    if (listen === undefined) {
      return;
    }

    let image;
    try {
      image = await getCoverArt(listen);
    } catch (error) {
      console.warn(error);
    }

    insertHtml(listen, image);
  };

  await loop();

  setInterval(loop, 5 * 60 * 1000);
});

async function getCoverArt(listen) {
  const releaseMbid = listen.track_metadata.additional_info?.release_mbid;
  if (releaseMbid === undefined) {
    return;
  }

  const result = await window.fetch(
    `https://coverartarchive.org/release/${releaseMbid}`,
    {
      headers: {
        Accept: "application/json",
      },
    },
  );
  if (!result.ok) {
    return;
  }

  const data = await result.json();
  if (data.images[0]?.thumbnails === undefined) {
    return;
  }

  const thumbnails = data.images[0].thumbnails;
  return (
    thumbnails.small ?? thumbnails["250"] ?? thumbnails["500"] ?? undefined
  );
}

async function getCurrentListen() {
  const result = await window.fetch(
    "https://api.listenbrainz.org/1/user/BaukeXYZ/playing-now",
  );
  if (!result.ok) {
    console.warn(result.status);
    return;
  }

  const data = await result.json();
  if (data.payload.listens.length === 0) {
    return;
  }

  return data.payload.listens[0];
}

function insertHtml(listen, image) {
  if (listen === undefined) {
    return;
  }

  const existing = document.querySelector(".listenbrainz") ?? undefined;
  if (existing !== undefined) {
    existing.remove();
  }

  const text = `${listen.track_metadata.artist_name} - ${listen.track_metadata.track_name}`;
  const alt = image === undefined ? "ListenBrainz Logo" : `${text} Cover Art`;

  image = image ?? "https://listenbrainz.org/static/img/logo_big.svg";
  image = image.startsWith("http://") ? "https" + image.slice(4) : image;

  const listenHtml = `
  <p class="listenbrainz">
    <img alt="${alt}" title="${alt}" src="${image}">
    <span class="byline">Currently listening to</span>
    <a href="https://listenbrainz.org/user/BaukeXYZ/" target="_blank">
      ${text}
    </a>
</p>`;

  document
    .querySelector(".page-header")
    .insertAdjacentHTML("beforeend", listenHtml);
}