import { initializeApp } from 'firebase/app';
import { getAuth, GoogleAuthProvider, signInWithPopup, signOut } from 'firebase/auth';
import { getFirestore, doc, getDocFromServer } from 'firebase/firestore';

const firebaseConfig = {
  apiKey: import.meta.env.VITE_FIREBASE_API_KEY || "dummy-api-key",
  authDomain: import.meta.env.VITE_FIREBASE_AUTH_DOMAIN || "dummy-auth-domain",
  projectId: import.meta.env.VITE_FIREBASE_PROJECT_ID || "dummy-project-id",
  storageBucket: import.meta.env.VITE_FIREBASE_STORAGE_BUCKET || "dummy-storage-bucket",
  messagingSenderId: import.meta.env.VITE_FIREBASE_MESSAGING_SENDER_ID || "dummy-sender-id",
  appId: import.meta.env.VITE_FIREBASE_APP_ID || "dummy-app-id",
  measurementId: import.meta.env.VITE_FIREBASE_MEASUREMENT_ID || "dummy-measurement-id"
};

// Check if Firebase config is complete to avoid "invalid-api-key" error
const isDummy = firebaseConfig.apiKey === "dummy-api-key" || !firebaseConfig.apiKey;
if (isDummy) {
  console.log("Firebase is running in Local Workspace Mode (No API keys provided). Data will be saved locally.");
}

const app = initializeApp(firebaseConfig);
export const auth = getAuth(app);
export const db = getFirestore(app, import.meta.env.VITE_FIREBASE_FIRESTORE_DATABASE_ID || '(default)');
export const googleProvider = new GoogleAuthProvider();

export const signInWithGoogle = async () => {
  if (isDummy) {
    throw new Error("LocalMode");
  }
  try {
    const result = await signInWithPopup(auth, googleProvider);
    return result.user;
  } catch (error) {
    console.error("Error signing in with Google", error);
    throw error;
  }
};

export const logOut = async () => {
  if (isDummy) return;
  try {
    await signOut(auth);
  } catch (error) {
    console.error("Error signing out", error);
    throw error;
  }
};

// Test connection
async function testConnection() {
  if (isDummy) return;
  try {
    await getDocFromServer(doc(db, 'test', 'connection'));
  } catch (error) {
    if(error instanceof Error && error.message.includes('the client is offline')) {
      console.warn("Firebase client is offline. Defaulting to local mode.");
    }
  }
}
testConnection();