// Upload files
uploadBtn.addEventListener('click', async () => {
  if (!files.length) return;
  const form = new FormData();
  files.forEach(f => form.append("files", f));

  try {
    const res = await fetch("http://127.0.0.1:8000/upload", {
      method: "POST",
      body: form
    });
    const data = await res.json();

    // Clear old output
    output.innerHTML = "";

    // Assuming backend returns { ids: ["abc123", "def456"] }
    data.ids.forEach((id, index) => {
      const snippet = `<img
  alt="${files[index]?.name || ""}"
  title="${files[index]?.name || ""}"
  class="lime"
  decoding="async"
  loading="lazy"
  src="https://imagedelivery.net/1KbIPRd69s6ShuwglEoJ-Q/${id}/thumb334"
  srcset="
    https://imagedelivery.net/1KbIPRd69s6ShuwglEoJ-Q/${id}/thumb334 334w,
    https://imagedelivery.net/1KbIPRd69s6ShuwglEoJ-Q/${id}/thumb600 600w,
    https://imagedelivery.net/1KbIPRd69s6ShuwglEoJ-Q/${id}/thumb900 900w
  "
  sizes="
    (max-width: 740px) 90vw,
    (max-width: 1024px) 50vw,
    (max-width: 1700px) 33vw,
    288px
  "
/>`;

      // Create wrapper
      const wrapper = document.createElement("div");
      wrapper.style.marginBottom = "20px";

      // Pre block
      const pre = document.createElement("pre");
      pre.textContent = snippet;

      // Copy button
      const copyBtn = document.createElement("button");
      copyBtn.textContent = "Copy";
      copyBtn.className = "btn";
      copyBtn.style.marginTop = "8px";
      copyBtn.addEventListener("click", () => {
        navigator.clipboard.writeText(snippet).then(() => {
          copyBtn.textContent = "Copied!";
          setTimeout(() => (copyBtn.textContent = "Copy"), 1500);
        });
      });

      wrapper.appendChild(pre);
      wrapper.appendChild(copyBtn);
      output.appendChild(wrapper);
    });
  } catch (err) {
    output.textContent = "Upload failed: " + err;
  }
});