import { entropyToMnemonic } from "/public/utils/bip39.js";

const urlParams = new URLSearchParams(globalThis.location.search);
const codeParam = urlParams.get("code");
if (codeParam) {
  const input = document.getElementById("inviteCode");
  if (input) {
    input.value = codeParam;
    document.getElementById("username")?.focus();
  }
}

let generatedMnemonic = "";

const registerBtn = document.getElementById("registerBtn");
if (registerBtn) {
  registerBtn.addEventListener("click", async () => {
    const username = document.getElementById("username").value.trim();
    const inviteCode = document.getElementById("inviteCode").value.trim();

    if (!username || !inviteCode) {
      setStatus("Username and Invite Code are required.", true);
      return;
    }

    const loader = document.getElementById("loadingIndicator");
    const btn = document.getElementById("registerBtn");
    loader.style.display = "block";
    btn.disabled = true;
    setStatus("");

    try {
      const res = await startWebAuthnRegistration(username, inviteCode);
      if (res && res.success) {
        // Generate 16 bytes of entropy for 12 BIP-39 words
        const entropy = new Uint8Array(16);
        crypto.getRandomValues(entropy);
        generatedMnemonic = await entropyToMnemonic(entropy);

        const words = generatedMnemonic.split(" ");
        const grid = document.getElementById("wordGrid");
        grid.innerHTML = words.map((w, idx) => `
          <div class="word-cell">
            <span class="word-num">${idx + 1}.</span>
            <span class="word-text">${w}</span>
          </div>
        `).join("");

        // Switch to Step 2
        document.getElementById("step1Container").style.display = "none";
        document.getElementById("step2Container").style.display = "block";
        document.getElementById("registerTitle").textContent =
          "Recovery Voucher";
        document.getElementById("registerSubtitle").textContent =
          "Save your 12-word backup key in a safe place.";
      }
    } catch (err) {
      console.error(err);
    } finally {
      loader.style.display = "none";
      btn.disabled = false;
    }
  });
}

const copyWordsBtn = document.getElementById("copyWordsBtn");
if (copyWordsBtn) {
  copyWordsBtn.addEventListener("click", async () => {
    if (!generatedMnemonic) return;
    try {
      await navigator.clipboard.writeText(generatedMnemonic);
      const btn = document.getElementById("copyWordsBtn");
      const origHtml = btn.innerHTML;
      btn.innerHTML = "<span>✓ Copied to Clipboard!</span>";
      btn.style.borderColor = "var(--success)";
      btn.style.color = "var(--success-text)";
      setTimeout(() => {
        btn.innerHTML = origHtml;
        btn.style.borderColor = "";
        btn.style.color = "";
      }, 2500);
    } catch (_e) {
      alert("Select and copy the words manually: " + generatedMnemonic);
    }
  });
}

function setStatus(msg, isError) {
  const statusDiv = document.getElementById("statusMessage");
  if (!statusDiv) return;
  if (msg) {
    statusDiv.textContent = msg;
    statusDiv.className = isError ? "error" : "success";
    statusDiv.style.display = "block";
  } else {
    statusDiv.style.display = "none";
  }
}