/**
 * Firebase Authentication Logic for Intaleq Dashboard
 */

const auth = {
    firebaseAuth: null,
    currentUser: null,
    idToken: null,

    init: () => {
        console.log('🔐 Initializing Auth Module...');
        
        // 1. Initialize Firebase
        firebase.initializeApp(firebaseConfig);
        auth.firebaseAuth = firebase.auth();

        // 2. Listen for Auth Changes
        auth.firebaseAuth.onAuthStateChanged(async (user) => {
            if (user) {
                console.log('✅ User logged in:', user.email);
                
                // Show Dashboard, Hide Login IMMEDIATELY to prevent black screen
                auth.toggleUI(true);
                
                auth.currentUser = user;
                auth.idToken = await user.getIdToken();
                
                // Initialize main app data
                if (typeof app !== 'undefined' && app.onAuthenticated) {
                    app.onAuthenticated();
                }
            } else {
                console.log('❌ No active session.');
                auth.currentUser = null;
                auth.idToken = null;
                
                // Show Login, Hide Dashboard
                auth.toggleUI(false);
            }
        });
    },

    signInWithGoogle: async () => {
        const provider = new firebase.auth.GoogleAuthProvider();
        try {
            await auth.firebaseAuth.signInWithPopup(provider);
        } catch (error) {
            console.error('Sign-in error:', error);
            alert('Failed to sign in. Please try again.');
        }
    },

    signOut: async () => {
        try {
            await auth.firebaseAuth.signOut();
        } catch (error) {
            console.error('Sign-out error:', error);
        }
    },

    toggleUI: (isAuthenticated) => {
        const loginSection = document.getElementById('login-section');
        const mainSidebar = document.getElementById('main-sidebar');
        const mainContent = document.getElementById('main-content');

        if (isAuthenticated) {
            if (loginSection) loginSection.classList.add('hidden');
            if (mainSidebar) mainSidebar.classList.remove('hidden');
            if (mainContent) mainContent.classList.remove('hidden');
        } else {
            if (loginSection) loginSection.classList.remove('hidden');
            if (mainSidebar) mainSidebar.classList.add('hidden');
            if (mainContent) mainContent.classList.add('hidden');
        }
    },

    getAuthHeader: () => {
        return auth.idToken ? { 'Authorization': `Bearer ${auth.idToken}` } : {};
    }
};

// Start Auth on Load
document.addEventListener('DOMContentLoaded', auth.init);