(function () {
  "use strict";

  function esc(s) {
    return String(s == null ? "" : s)
      .replace(/&/g, "&")
      .replace(/</g, "&lt;")
      .replace(/>/g, "&gt;");
  }

  function subdomain(id) {
    return id.toLowerCase().replace(/[^a-z0-9-]/g, "-");
  }

  function countExperiments(node) {
    let n = 0;
    (node.children || []).forEach((c) => {
      n += 1 + countExperiments(c);
    });
    return n;
  }

  function timeAgo(iso) {
    if (!iso) return "";
    const d = (Date.now() - new Date(iso).getTime()) / 86400000;
    if (d < 1) return "today";
    if (d < 2) return "yesterday";
    if (d < 30) return `${Math.floor(d)}d ago`;
    if (d < 365) return `${Math.floor(d / 30)}mo ago`;
    return `${Math.floor(d / 365)}y ago`;
  }

  function card(space) {
    const id = space.id;
    const owner = id.split("/")[0];
    const name = id.split("/")[1] || id;
    const sub = subdomain(id);
    const title = (space.cardData && space.cardData.title) || name;

    const a = document.createElement("a");
    a.className = "card";
    a.href = `https://huggingface.co/spaces/${id}`;
    a.target = "_blank";
    a.rel = "noopener";
    a.innerHTML =
      `<div class="preview"><div class="ph">preview…</div>` +
      `<iframe loading="lazy" title="${esc(title)}" ` +
      `src="https://${sub}.static.hf.space/"></iframe></div>` +
      `<div class="card-body">` +
      `<div class="card-title">${esc(title)}</div>` +
      `<div class="card-owner">${esc(owner)}</div>` +
      `<div class="card-meta">` +
      (space.likes ? `<span class="chip">♥ ${space.likes}</span>` : "") +
      (space.lastModified
        ? `<span class="chip">${esc(timeAgo(space.lastModified))}</span>`
        : "") +
      `<span class="chip exp" data-exp></span>` +
      `</div></div>`;
    return a;
  }

  async function enrich(space, el) {
    const sub = subdomain(space.id);
    const chip = el.querySelector("[data-exp]");
    try {
      const r = await fetch(`https://${sub}.static.hf.space/logbook.json`);
      if (!r.ok) throw new Error();
      const manifest = await r.json();
      const n = countExperiments(manifest.root || {});
      chip.textContent = n === 1 ? "1 experiment" : `${n} experiments`;
      if (manifest.title) el.querySelector(".card-title").textContent = manifest.title;
    } catch (e) {
      chip.remove();
    }
  }

  async function main() {
    const grid = document.getElementById("grid");
    let spaces = [];
    try {
      const r = await fetch(
        "https://huggingface.co/api/spaces?filter=trackio-logbook&full=true&limit=300"
      );
      spaces = await r.json();
    } catch (e) {
      grid.innerHTML = '<p class="empty">Could not load logbooks right now.</p>';
      return;
    }
    spaces = spaces.filter((s) => !s.sdk || s.sdk === "static");
    spaces.sort(
      (a, b) => new Date(b.lastModified || 0) - new Date(a.lastModified || 0)
    );
    if (!spaces.length) {
      grid.innerHTML =
        '<p class="empty">No logbooks published yet. Be the first!</p>';
      document.getElementById("count").textContent = "";
      return;
    }
    document.getElementById("count").textContent =
      `${spaces.length} logbook${spaces.length === 1 ? "" : "s"}`;
    grid.innerHTML = "";
    spaces.forEach((s) => {
      const el = card(s);
      grid.appendChild(el);
      enrich(s, el);
    });
  }

  main();
})();