document.getElementById("registerButton").addEventListener("click", register);
document.getElementById("loginButton").addEventListener("click", login);

function showMessage(message, isError = false) {
  const messageElement = document.getElementById("message");
  messageElement.textContent = message;
  messageElement.style.color = isError ? "red" : "green";
}

async function register() {
  // Retrieve the username from the input field
  const username = document.getElementById("username").value;

  try {
    // Get registration options from your server. Here, we also receive the challenge.
    const response = await fetch("/webauthn/passkey/registerBegin", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ username: username }),
    });

    // Check if the registration options are ok.
    if (!response.ok) {
      const msg = await response.json();
      throw new Error(
        "User already exists or failed to get registration options from server: " +
        msg,
      );
    }

    // Convert the registration options to JSON.
    const options = await response.json();
    console.log("registration start", options);

    // This triggers the browser to display the passkey / WebAuthn modal (e.g. Face ID, Touch ID, Windows Hello).
    // A new attestation is created. This also means a new public-private-key pair is created.
    const attestationResponse = await SimpleWebAuthnBrowser.startRegistration(
      options.publicKey,
    );

    console.log("Attempting to complete registration", attestationResponse);
    // Send attestationResponse back to server for verification and storage.
    const verificationResponse = await fetch(
      "/webauthn/passkey/registerFinish",
      {
        method: "POST",
        credentials: "same-origin",
        headers: {
          "Content-Type": "application/json",
        },
        body: JSON.stringify(attestationResponse),
      },
    );

    const msg = await verificationResponse.json();
    if (verificationResponse.ok) {
      showMessage(msg, false);
    } else {
      showMessage(msg, true);
    }
  } catch (error) {
    showMessage("Error: " + error.message, true);
  }
}

async function login() {
  // Retrieve the username from the input field
  const username = document.getElementById("username").value;

  try {
    // Get login options from your server. Here, we also receive the challenge.
    const response = await fetch("/webauthn/passkey/loginBegin", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ username: username }),
    });
    // Check if the login options are ok.
    if (!response.ok) {
      const msg = await response.json();
      throw new Error("Failed to get login options from server: " + msg);
    }
    // Convert the login options to JSON.
    const options = await response.json();

    // This triggers the browser to display the passkey / WebAuthn modal (e.g. Face ID, Touch ID, Windows Hello).
    // A new assertionResponse is created. This also means that the challenge has been signed.
    const assertionResponse = await SimpleWebAuthnBrowser.startAuthentication(
      options.publicKey,
    );

    // Send assertionResponse back to server for verification.
    const verificationResponse = await fetch("/webauthn/passkey/loginFinish", {
      method: "POST",
      credentials: "same-origin",
      headers: {
        "Content-Type": "application/json",
      },
      body: JSON.stringify(assertionResponse),
    });

    const msg = await verificationResponse.json();
    if (verificationResponse.ok) {
      showMessage(msg, false);
    } else {
      showMessage(msg, true);
    }
  } catch (error) {
    showMessage("Error: " + error.message, true);
  }
}