// Shared utility functions
const formatDate = (dateString) => {
    const options = { year: 'numeric', month: 'short', day: 'numeric' };
    return new Date(dateString).toLocaleDateString(undefined, options);
};

const calculateProgress = (current, target) => {
    return Math.min(Math.round((current / target) * 100), 100);
};

// Auth state management
let currentUser = null;

const setCurrentUser = (user) => {
    currentUser = user;
    localStorage.setItem('currentUser', JSON.stringify(user));
    updateUIForUserRole();
};

const getCurrentUser = () => {
    if (!currentUser && localStorage.getItem('currentUser')) {
        currentUser = JSON.parse(localStorage.getItem('currentUser'));
    }
    return currentUser;
};

const logout = () => {
    currentUser = null;
    localStorage.removeItem('currentUser');
    window.location.href = '/';
};

const updateUIForUserRole = () => {
    const user = getCurrentUser();
    if (!user) return;

    // Show/hide elements based on role
    document.querySelectorAll('[data-role="admin"]').forEach(el => {
        el.style.display = user.role === 'admin' ? 'block' : 'none';
    });
    
    document.querySelectorAll('[data-role="manager"]').forEach(el => {
        el.style.display = user.role === 'manager' ? 'block' : 'none';
    });
    
    document.querySelectorAll('[data-role="employee"]').forEach(el => {
        el.style.display = user.role === 'employee' ? 'block' : 'none';
    });
};

// Initialize app when DOM is loaded
document.addEventListener('DOMContentLoaded', () => {
    updateUIForUserRole();
});