/**
 * Authentication service for Firebase and OTP authentication
 */

const API_BASE_URL = import.meta.env.VITE_API_BASE_URL || "";

/**
 * Get the current authenticated user
 * @returns {Promise<Object>} User object
 */
export async function getCurrentUser() {
  const token = localStorage.getItem("auth_token");
  if (!token) {
    throw new Error("No token found");
  }

  const response = await fetch(`${API_BASE_URL}/api/auth/me`, {
    method: "GET",
    headers: {
      Authorization: `Bearer ${token}`,
    },
  });

  if (!response.ok) {
    if (response.status === 401) {
      localStorage.removeItem("auth_token");
    }
    const errorData = await response.json().catch(() => ({}));
    throw new Error(errorData.detail || "Failed to get user");
  }

  return await response.json();
}

/**
 * Login with Firebase ID token
 * @param {string} idToken - Firebase ID token
 * @returns {Promise<Object>} Response with token and user
 */
export async function firebaseLogin(idToken) {
  const response = await fetch(`${API_BASE_URL}/api/auth/firebase/login`, {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
    },
    body: JSON.stringify({ id_token: idToken }),
  });

  if (!response.ok) {
    const errorData = await response.json().catch(() => ({}));
    throw new Error(errorData.detail || "Firebase login failed");
  }

  return await response.json();
}

/**
 * Request OTP for email login
 * @param {string} email - Email address
 * @returns {Promise<Object>} Response with success message
 */
export async function requestOTP(email) {
  const response = await fetch(`${API_BASE_URL}/api/auth/otp/request`, {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
    },
    body: JSON.stringify({ email }),
  });

  if (!response.ok) {
    const errorData = await response.json().catch(() => ({}));
    throw new Error(errorData.detail || "Failed to send OTP");
  }

  return await response.json();
}

/**
 * Verify OTP and login
 * @param {string} email - Email address
 * @param {string} otp - OTP code
 * @returns {Promise<Object>} Response with token and user
 */
export async function verifyOTP(email, otp) {
  const response = await fetch(`${API_BASE_URL}/api/auth/otp/verify`, {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
    },
    body: JSON.stringify({ email, otp }),
  });

  if (!response.ok) {
    const errorData = await response.json().catch(() => ({}));
    throw new Error(errorData.detail || "OTP verification failed");
  }

  return await response.json();
}

/**
 * Logout the current user
 * @returns {Promise<void>}
 */
export async function logout() {
  // For JWT tokens, logout is handled client-side by removing the token
  // No server-side logout needed
  return Promise.resolve();
}