Función PHP - JavaScript OV Preloader

function add_ov_preloader_script() {
    if (isset($_GET['et_fb'])) {
        return;
    }
    ?>
    <script>
        document.addEventListener('DOMContentLoaded', () => {
            const preloader = document.querySelector('.ov-preloader');
            const preloaderBg = document.querySelector('.ov-preloader-background');
            const progressElement = document.querySelector('.ov-loading-progress');

            function animateCounter() {
                const duration = 1000;
                const start = performance.now();

                function update(currentTime) {
                    const elapsed = currentTime - start;
                    const progress = Math.min(elapsed / duration, 1);

                    const easeProgress = 1 - Math.pow(1 - progress, 3);
                    const currentValue = Math.floor(easeProgress * 100);

                    if (progressElement) {
                        progressElement.textContent = `${currentValue}%`;
                    }

                    if (progress < 1) {
                        requestAnimationFrame(update);
                    } else {
                        startReveal();
                    }
                }

                requestAnimationFrame(update);
            }

            function startReveal() {
                if (preloader) {
                    preloader.classList.add('ov-loaded');
                }

                setTimeout(() => {
                    if (preloaderBg) {
                        preloaderBg.classList.add('fade-out');
                    }
                }, 1000);

                setTimeout(() => {
                    if (preloader) {
                        preloader.style.display = 'none';
                    }
                    if (preloaderBg) {
                        preloaderBg.style.display = 'none';
                    }
                }, 2000);
            }

            window.addEventListener('load', () => {
                animateCounter();
            });
        });
    </script>
    <?php
}
add_action('wp_footer', 'add_ov_preloader_script', 99);