Speed Optimization

// Enqueue scripts and styles
function ivy_machinery_scripts() {
    // Remove jQuery completely
    if (!is_admin()) {
        wp_deregister_script('jquery');
    }

    // Enqueue Tailwind CSS
    wp_enqueue_style('ivy-machinery-tailwind', get_template_directory_uri() . '/css/output.css', array(), '1.0.0');

    // Enqueue custom styles
    wp_enqueue_style('ivy-machinery-style', get_template_directory_uri() . '/css/styles.css', array(), '1.0.0');

    // Conditionally load AOS only on pages that need animations
    if (!is_page('contact-us') && !is_page('about') && !is_front_page()) {
        // Skip AOS on pages that don't need it
        // Customize this condition based on your needs
    } else {
        // Enqueue AOS CSS with preload
        wp_enqueue_style('aos-css', 'https://unpkg.com/aos@next/dist/aos.css', array(), '1.0.0');

        // Add preload for AOS CSS
        add_action('wp_head', function() {
            echo '<link rel="preload" href="https://unpkg.com/aos@next/dist/aos.css" as="style">';
        });

        // Enqueue AOS JavaScript
        wp_enqueue_script('aos-js', 'https://unpkg.com/aos@next/dist/aos.js', array(), '1.0.0', true);

        // Enqueue shared JavaScript
        wp_enqueue_script('ivy-machinery-shared', get_template_directory_uri() . '/js/shared.js', array('aos-js'), '1.0.0', true);
    }

    // Enqueue homepage JavaScript only on the front page
    if (is_front_page()) {
        wp_enqueue_script('ivy-machinery-homepage', get_template_directory_uri() . '/js/homepage.js', array(), '1.0.0', true);
    }

    // Only load comment reply script when needed
    if (is_singular() && comments_open() && get_option('thread_comments')) {
        wp_enqueue_script('comment-reply');
    }
}
add_action('wp_enqueue_scripts', 'ivy_machinery_scripts');

// Add async/defer attributes to scripts
function add_async_defer_attribute($tag, $handle) {
    // Add async to AOS
    if ('aos-js' === $handle) {
        return str_replace(' src', ' async src', $tag);
    }

    // Add defer to your scripts
    if ('ivy-machinery-shared' === $handle || 'ivy-machinery-homepage' === $handle) {
        return str_replace(' src', ' defer src', $tag);
    }

    return $tag;
}
add_filter('script_loader_tag', 'add_async_defer_attribute', 10, 2);

// Preload critical assets
function ivy_machinery_preload_assets() {
    ?>
    <link rel="preload" href="<?php echo get_template_directory_uri(); ?>/css/output.css" as="style">
    <link rel="preload" href="<?php echo get_template_directory_uri(); ?>/css/styles.css" as="style">
    <?php
}
add_action('wp_head', 'ivy_machinery_preload_assets', 1);

// Remove WordPress version number
function remove_version_info() {
    return '';
}
add_filter('the_generator', 'remove_version_info');

// Remove query strings from static resources
function remove_query_strings() {
    if(!is_admin()) {
        add_filter('script_loader_src', 'remove_query_strings_split', 15);
        add_filter('style_loader_src', 'remove_query_strings_split', 15);
    }
}
function remove_query_strings_split($src){
    $output = preg_split("/(&ver|\?ver)/", $src);
    return $output[0];
}
add_action('init', 'remove_query_strings');

// Disable embeds
function disable_embeds() {
    // Remove the REST API endpoint
    remove_action('rest_api_init', 'wp_oembed_register_route');

    // Turn off oEmbed auto discovery
    add_filter('embed_oembed_discover', '__return_false');

    // Don't filter oEmbed results
    remove_filter('oembed_dataparse', 'wp_filter_oembed_result', 10);

    // Remove oEmbed discovery links
    remove_action('wp_head', 'wp_oembed_add_discovery_links');

    // Remove oEmbed JavaScript from the front-end and back-end
    remove_action('wp_head', 'wp_oembed_add_host_js');

    // Remove all embeds rewrite rules
    add_filter('rewrite_rules_array', 'disable_embeds_rewrites');
}
add_action('init', 'disable_embeds', 9999);

function disable_embeds_rewrites($rules) {
    foreach($rules as $rule => $rewrite) {
        if(false !== strpos($rewrite, 'embed=true')) {
            unset($rules[$rule]);
        }
    }
    return $rules;
}

// Disable XML-RPC
add_filter('xmlrpc_enabled', '__return_false');

// Remove REST API links
remove_action('wp_head', 'rest_output_link_wp_head', 10);
remove_action('template_redirect', 'rest_output_link_header', 11);

# BEGIN Expire headers
<IfModule mod_expires.c>
  ExpiresActive On
  ExpiresDefault "access plus 1 month"
  ExpiresByType image/jpg "access plus 1 year"
  ExpiresByType image/jpeg "access plus 1 year"
  ExpiresByType image/gif "access plus 1 year"
  ExpiresByType image/png "access plus 1 year"
  ExpiresByType image/svg+xml "access plus 1 month"
  ExpiresByType text/css "access plus 1 month"
  ExpiresByType text/html "access plus 1 minute"
  ExpiresByType application/pdf "access plus 1 month"
  ExpiresByType text/javascript "access plus 1 month"
  ExpiresByType application/javascript "access plus 1 month"
  ExpiresByType application/x-javascript "access plus 1 month"
  ExpiresByType application/x-shockwave-flash "access plus 1 month"
  ExpiresByType image/x-icon "access plus 1 year"
  ExpiresByType application/x-font-ttf "access plus 1 year"
  ExpiresByType application/x-font-woff "access plus 1 year"
  ExpiresByType application/font-woff "access plus 1 year"
  ExpiresByType application/font-woff2 "access plus 1 year"
  ExpiresByType font/woff "access plus 1 year"
  ExpiresByType font/woff2 "access plus 1 year"
</IfModule>
# END Expire headers

# BEGIN GZIP
<IfModule mod_deflate.c>
  AddOutputFilterByType DEFLATE text/plain
  AddOutputFilterByType DEFLATE text/html
  AddOutputFilterByType DEFLATE text/xml
  AddOutputFilterByType DEFLATE text/css
  AddOutputFilterByType DEFLATE application/xml
  AddOutputFilterByType DEFLATE application/xhtml+xml
  AddOutputFilterByType DEFLATE application/rss+xml
  AddOutputFilterByType DEFLATE application/javascript
  AddOutputFilterByType DEFLATE application/x-javascript
  AddOutputFilterByType DEFLATE application/x-font-ttf
  AddOutputFilterByType DEFLATE application/vnd.ms-fontobject
  AddOutputFilterByType DEFLATE font/opentype font/ttf font/eot font/otf
</IfModule>
# END GZIP