<?php
namespace Tenweb_Manager\Optimizer {

    class twoptimizeMain
    {
        protected static $instance = null;
        /**
         * @var bool|mixed|void
         */
        private $two_bg_lazyload;
        /**
         * @var bool|mixed|void
         */
        private $two_video_lazyload;
        /**
         * @var bool|mixed|void
         */
        private $two_iframe_lazyload;
        /**
         * @var bool|mixed|void
         */
        private $two_exclude_js;

        private function __construct()
        {
            $this->two_bg_lazyload = get_option('two_bg_lazyload', 'off');
            $this->two_video_lazyload = get_option('two_video_lazyload', 'off');
            $this->two_iframe_lazyload = get_option('two_iframe_lazyload', 'off');
            $this->two_exclude_js = get_option('two_exclude_js', 'wp-content/cache/, wp-includes/js/dist/, wp-includes/js/tinymce/, js/jquery/jquery.js');
            $this->init();
        }


        public function init()
        {
            $this->init_defines();
            require_once('twoptimizeBase.php');
            require_once('twoptimizeScripts.php');
            require_once('twoptimizeCSS.php');
            require_once('twoptimizeLazyload.php');

            $optimizeLazyLoad = new twoptimizeLazyload();

            add_action('wp_footer', array($this, 'add_lazyload_js_footer'), 10, 0);

            $optimizeLazyLoad->addFilterForImages();

            if ($this->two_iframe_lazyload === 'on') {
                $optimizeLazyLoad->addFilterForIframes();
            }

            if ($this->two_video_lazyload === 'on') {
                $optimizeLazyLoad->addFilterForVideo();
            }
            ob_start(array($this, 'end_buffering'));
        }

        private function init_defines()
        {
            if (!defined('TWMO_LAZYLOAD')) {
                define('TWMO_LAZYLOAD', true);
            }

            if (!defined('TWMO_WP_SITE_URL')) {
                if (function_exists('domain_mapping_siteurl')) {
                    define('TWMO_WP_SITE_URL', domain_mapping_siteurl(get_current_blog_id()));
                } else {
                    define('TWMO_WP_SITE_URL', site_url());
                }
            }
            if (!defined('TWMO_WP_CONTENT_URL')) {
                if (function_exists('get_original_url')) {
                    define('TWMO_WP_CONTENT_URL', str_replace(get_original_url(TWMO_WP_SITE_URL), TWMO_WP_SITE_URL, content_url()));
                } else {
                    define('TWMO_WP_CONTENT_URL', content_url());
                }
            }
            if (!defined('TWMO_WP_CONTENT_NAME')) {
                define('TWMO_WP_CONTENT_NAME', '/' . wp_basename(WP_CONTENT_DIR));
            }
            if (!defined('TWMO_WP_ROOT_URL')) {
                define('TWMO_WP_ROOT_URL', str_replace(TWMO_WP_CONTENT_NAME, '', TWMO_WP_CONTENT_URL));
            }
            if (!defined('TWMO_CACHE_URL')) {
                if (is_multisite()) {
                    $blog_id = get_current_blog_id();
                    define('TWMO_CACHE_URL', TWMO_WP_CONTENT_URL . TWMO_CACHE_CHILD_DIR . $blog_id . '/');
                } else {
                    define('TWMO_CACHE_URL', TWMO_WP_CONTENT_URL . TWMO_CACHE_CHILD_DIR);
                }
            }
            define('WP_ROOT_DIR', substr(WP_CONTENT_DIR, 0, strlen(WP_CONTENT_DIR) - strlen(TWMO_WP_CONTENT_NAME)));
            if (!defined('TWMO_HASH')) {
                define('TWMO_HASH', wp_hash(TWMO_CACHE_URL));
            }
            define('TWMO_CACHE_NOGZIP', true);
            if (!defined('TWMO_CACHEFILE_PREFIX')) {
                define('TWMO_CACHEFILE_PREFIX', 'twmo_');
            }
        }

        public static function optimize()
        {
            if (self::$instance === null) {
                self::$instance = new self;
            }

            return self::$instance;
        }

        public function add_lazyload_js_footer()
        {
            if (TWMO_LAZYLOAD) {
                if ($this->two_iframe_lazyload === 'on' || $this->two_bg_lazyload === 'on' || $this->two_video_lazyload === 'on') {
                    $noptimize_flag = ' data-noptimize="1"';
                    echo '<script ' . $noptimize_flag . '>window.lazySizesConfig=window.lazySizesConfig||{};window.lazySizesConfig.loadMode=1;</script>';
                    echo '<script src="' . TENWEB_URL_JS . '/jquery.lazy.min.js"></script>';
                    if ($this->two_iframe_lazyload === 'on') {
                        echo '<script src="' . TENWEB_URL_JS . '/jquery.lazy.iframe.min.js"></script>';
                    }
                    if ($this->two_video_lazyload === 'on') {
                        echo '<script src="' . TENWEB_URL_JS . '/jquery.lazy.av.min.js"></script>';
                    }
                    if ($this->two_bg_lazyload === 'on') {
                        echo '<script src="' . TENWEB_URL_JS . '/two_lazyload.js"></script>';
                    }
                    echo "<script>
            window.onload = function() {
                 jQuery('.lazyload').Lazy({
                  visibleOnly:true,
                  afterLoad: function(element) {
                     element.css('display', '');
                  }
                 });
            }
          </script>
        ";
                }
            }
        }

        /**
         * @param $content
         *  return html content
         *
         * @return mixed|string|void
         */
        private function end_buffering($content)
        {

            //this one must work always because it disables pagespeed lazyload through html attribute
            $content = apply_filters('twoptimize_html_lazyload_images', $content);

            if ($this->two_video_lazyload === 'on') {
                $content = apply_filters('twoptimize_html_lazyload_video', $content);
            }
            if ($this->two_iframe_lazyload === 'on') {
                $content = apply_filters('twoptimize_html_lazyload_iframes', $content);
            }

            $twoptimizeScripts = new twoptimizeScripts($content);
            $twoptimizeScripts->read(
                array(
                    'js_exclude' => $this->two_exclude_js,
                )
            );
            $content = $twoptimizeScripts->getcontent();


            $twoptimizeStyles = new twoptimizeCSS();
            $content = $twoptimizeStyles->run($content);

            return $content;
        }
    }
}