// assets/js/main.js

document.addEventListener('DOMContentLoaded', function() {
    
    // --- Dark Mode System ---
    const themeToggleBtn = document.getElementById('themeToggle');
    const htmlElement = document.documentElement;
    
    // Check local storage or system preference
    if (localStorage.getItem('theme') === 'dark' || (!('theme' in localStorage) && window.matchMedia('(prefers-color-scheme: dark)').matches)) {
        htmlElement.classList.add('dark');
    } else {
        htmlElement.classList.remove('dark');
    }

    if (themeToggleBtn) {
        themeToggleBtn.addEventListener('click', function() {
            htmlElement.classList.toggle('dark');
            if (htmlElement.classList.contains('dark')) {
                localStorage.setItem('theme', 'dark');
            } else {
                localStorage.setItem('theme', 'light');
            }
        });
    }

    // --- Loading Button Global Handling ---
    // If a button has 'data-loading-text', it will show a spinner when clicked within a form
    const forms = document.querySelectorAll('form');
    forms.forEach(form => {
        form.addEventListener('submit', function(e) {
            const submitBtn = form.querySelector('button[type="submit"]');
            if (submitBtn) {
                // Don't disable immediately if validation is required and fails, but assuming HTML5 validation passes here
                submitBtn.classList.add('btn-loading');
                // Optional: revert loading state if the form submission is prevented via AJAX in specific page scripts
            }
        });
    });

    // --- PWA Service Worker Registration ---
    if ('serviceWorker' in navigator) {
        window.addEventListener('load', () => {
            navigator.serviceWorker.register('sw.js')
                .then(registration => {
                    console.log('ServiceWorker registration successful with scope: ', registration.scope);
                })
                .catch(err => {
                    console.log('ServiceWorker registration failed: ', err);
                });
        });
    }
});