// Shared JavaScript across all pages
console.log('TimeTracker Pro - Work Hours Wizard loaded');

// Initialize app functionality
document.addEventListener('DOMContentLoaded', function() {
    // Check for service worker support
    if ('serviceWorker' in navigator) {
        navigator.serviceWorker.register('/sw.js')
            .then(registration => console.log('SW registered'))
            .catch(error => console.log('SW registration failed'));
    }

    // Handle mobile menu toggle
    const mobileMenuBtn = document.getElementById('mobile-menu-btn');
    const mobileMenu = document.getElementById('mobile-menu');
    
    if (mobileMenuBtn && mobileMenu) {
        mobileMenuBtn.addEventListener('click', function() {
            mobileMenu.classList.toggle('hidden');
        });
    }

    // Smooth scrolling for anchor links
    document.querySelectorAll('a[href^="#"]').forEach(anchor => {
        anchor.addEventListener('click', function (e) {
            e.preventDefault();
            const target = document.querySelector(this.getAttribute('href'));
            if (target) {
                target.scrollIntoView({
                    behavior: 'smooth',
                    block: 'start'
                });
            }
        });
    });

    // Theme handling
    const themeToggle = document.getElementById('theme-toggle');
    if (themeToggle) {
        themeToggle.addEventListener('click', function() {
            const html = document.documentElement;
            if (html.classList.contains('dark')) {
                html.classList.remove('dark');
                localStorage.setItem('theme', 'light');
            } else {
                html.classList.add('dark');
                localStorage.setItem('theme', 'dark');
            }
            feather.replace();
        });
    }

    // Check for saved theme preference
    const savedTheme = localStorage.getItem('theme');
    if (savedTheme === 'dark') {
        document.documentElement.classList.add('dark');
    }

    // Add loading states to buttons
    document.querySelectorAll('button, a').forEach(element => {
        element.addEventListener('click', function() {
            if (this.classList.contains('btn-loading')) {
                this.classList.add('loading');
                const originalText = this.innerHTML;
                this.innerHTML = '<i data-feather="loader" class="animate-spin"></i> Loading...';
                feather.replace();
                
                // Reset after 2 seconds for demo
                setTimeout(() => {
                    this.classList.remove('loading');
                    this.innerHTML = originalText;
                    feather.replace();
                }, 2000);
            }
        });
    });
});

// API functions for time tracking
const TimeTrackerAPI = {
    // Simulate time tracking data
    getCurrentTime: function() {
        return new Date().toLocaleTimeString();
    },

    // Calculate work duration
    calculateDuration: function(startTime, endTime) {
        const start = new Date(`1970-01-01T${startTime}`);
        const end = new Date(`1970-01-01T${endTime}`);
        const diff = end - start;
        const hours = Math.floor(diff / 3600000);
        const minutes = Math.floor((diff % 3600000) / 60000);
        return `${hours}h ${minutes}m`;
    },

    // Get today's summary
    getTodaySummary: function() {
        return {
            totalHours: '8.5',
            tasksCompleted: 12,
            breaksTaken: 3,
            overtime: '0.5'
        };
    }
};

// Export for use in other modules
window.TimeTrackerAPI = TimeTrackerAPI;