// Authentication UI management
let pendingAction = null;

// Initialize auth UI when DOM is loaded
document.addEventListener('DOMContentLoaded', function() {
    initAuthUI();
    updateNavbar();
});

// Initialize authentication UI
function initAuthUI() {
    // Modal functionality
    const modal = document.getElementById('loginModal');
    const closeBtn = document.getElementById('modalClose');
    const demoBtn = document.getElementById('demoLoginBtn');

    if (closeBtn) {
        closeBtn.addEventListener('click', closeModal);
    }

    if (demoBtn) {
        demoBtn.addEventListener('click', handleDemoLogin);
    }

    // Close modal on backdrop click
    if (modal) {
        modal.addEventListener('click', (e) => {
            if (e.target === modal) {
                closeModal();
            }
        });
    }

    // Close modal on Escape key
    document.addEventListener('keydown', (e) => {
        if (e.key === 'Escape' && isModalOpen()) {
            closeModal();
        }
    });
}

// Show login modal
function showLoginModal(action = null) {
    pendingAction = action;
    const modal = document.getElementById('loginModal');
    if (modal) {
        modal.style.display = 'flex';
        document.body.style.overflow = 'hidden';
        
        // Focus management
        const focusableElements = modal.querySelectorAll('button, a');
        if (focusableElements.length > 0) {
            focusableElements[0].focus();
        }
    }
}

// Close login modal
function closeModal() {
    const modal = document.getElementById('loginModal');
    if (modal) {
        modal.style.display = 'none';
        document.body.style.overflow = '';
        pendingAction = null;
    }
}

// Check if modal is open
function isModalOpen() {
    const modal = document.getElementById('loginModal');
    return modal && modal.style.display === 'flex';
}

// Handle demo login from modal
async function handleDemoLogin() {
    try {
        const result = await auth.loginAsDemo();
        
        if (result.success) {
            auth.showToast(`Welcome, ${result.user.name}!`, 'success');
            closeModal();
            updateNavbar();
            
            // Execute pending action if any
            if (pendingAction && typeof pendingAction === 'function') {
                pendingAction();
            }
        } else {
            auth.showToast(result.error || 'Demo login failed', 'error');
        }
    } catch (error) {
        auth.showToast('An error occurred. Please try again.', 'error');
    }
}

// Update navbar based on auth state
function updateNavbar() {
    const navActions = document.querySelector('.nav-actions');
    if (!navActions) return;

    if (auth.isAuthenticated()) {
        const user = auth.getUser();
        
        // Create user dropdown
        navActions.innerHTML = `
            <div class="user-dropdown">
                <button class="user-avatar" id="userAvatar" aria-label="User menu">
                    ${user.avatar || user.name.charAt(0).toUpperCase()}
                </button>
                <div class="dropdown-menu" id="userDropdown">
                    <div class="dropdown-header">
                        <div class="user-info">
                            <div class="user-name">${user.name}</div>
                            <div class="user-email">${user.email}</div>
                        </div>
                    </div>
                    <div class="dropdown-divider"></div>
                    <a href="#" class="dropdown-item" id="profileLink">
                        <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
                            <path d="M20 21v-2a4 4 0 0 0-4-4H8a4 4 0 0 0-4 4v2"/>
                            <circle cx="12" cy="7" r="4"/>
                        </svg>
                        Profile
                    </a>
                    <a href="#" class="dropdown-item" id="savedCasesLink">
                        <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
                            <path d="M19 21l-7-5-7 5V5a2 2 0 0 1 2-2h10a2 2 0 0 1 2 2z"/>
                        </svg>
                        Saved Cases
                    </a>
                    <a href="#" class="dropdown-item" id="settingsLink">
                        <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
                            <circle cx="12" cy="12" r="3"/>
                            <path d="M12 1v6m0 6v6m11-7h-6m-6 0H1"/>
                        </svg>
                        Settings
                    </a>
                    <div class="dropdown-divider"></div>
                    <button class="dropdown-item logout-btn" id="logoutBtn">
                        <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
                            <path d="M9 21H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h4"/>
                            <polyline points="16,17 21,12 16,7"/>
                            <line x1="21" y1="12" x2="9" y2="12"/>
                        </svg>
                        Log out
                    </button>
                </div>
            </div>
        `;

        // Add event listeners
        const userAvatar = document.getElementById('userAvatar');
        const userDropdown = document.getElementById('userDropdown');
        const logoutBtn = document.getElementById('logoutBtn');

        // Toggle dropdown
        if (userAvatar) {
            userAvatar.addEventListener('click', (e) => {
                e.stopPropagation();
                userDropdown.classList.toggle('show');
            });
        }

        // Close dropdown when clicking outside
        document.addEventListener('click', (e) => {
            if (!userAvatar?.contains(e.target) && !userDropdown?.contains(e.target)) {
                userDropdown?.classList.remove('show');
            }
        });

        // Handle logout
        if (logoutBtn) {
            logoutBtn.addEventListener('click', () => {
                auth.logout();
                updateNavbar();
                location.reload(); // Refresh to update navbar
            });
        }

        // Handle other dropdown items (placeholder functionality)
        document.getElementById('profileLink')?.addEventListener('click', (e) => {
            e.preventDefault();
            auth.showToast('Profile page coming soon!', 'info');
            userDropdown.classList.remove('show');
        });

        document.getElementById('savedCasesLink')?.addEventListener('click', (e) => {
            e.preventDefault();
            auth.showToast('Saved cases feature coming soon!', 'info');
            userDropdown.classList.remove('show');
        });

        document.getElementById('settingsLink')?.addEventListener('click', (e) => {
            e.preventDefault();
            auth.showToast('Settings page coming soon!', 'info');
            userDropdown.classList.remove('show');
        });
    } else {
        // User not authenticated, show login button
        navActions.innerHTML = `
            <button class="btn btn-outline" id="loginBtn">Log in</button>
        `;

        // Add login button event listener
        document.getElementById('loginBtn')?.addEventListener('click', () => {
            window.location.href = 'login.html';
        });
    }
}

// Auth guard function
function requireAuth(action) {
    if (auth.isAuthenticated()) {
        // User is authenticated, execute action
        if (action && typeof action === 'function') {
            action();
        }
    } else {
        // User not authenticated, show login modal
        showLoginModal(action);
    }
}

// Make functions globally available
window.requireAuth = requireAuth;
window.showLoginModal = showLoginModal;
window.updateNavbar = updateNavbar;