<?php

/**
 * HTML admin controller
 *
 * @since      2.8
 * @package    abovethefold
 * @subpackage abovethefold/admin
 * @author     PageSpeed.pro <info@pagespeed.pro>
 */

class Abovethefold_Admin_HTML
{

    /**
     * Above the fold controller
     */
    public $CTRL;

    /**
     * Options
     */
    public $options;

    /**
     * Initialize the class and set its properties.
     */
    public function __construct(&$CTRL)
    {
        $this->CTRL =& $CTRL;
        $this->options =& $CTRL->options;

        /**
         * Admin panel specific
         */
        if (is_admin()) {

            /**
             * Handle form submissions
             */
            $this->CTRL->loader->add_action('admin_post_abtf_html_update', $this, 'update_settings');

            $this->CTRL->loader->add_action('admin_enqueue_scripts', $this, 'enqueue_scripts', 30);
        }
    }

    /**
     * Update settings
     */
    public function update_settings()
    {
        check_admin_referer('abovethefold');

        // @link https://codex.wordpress.org/Function_Reference/stripslashes_deep
        $_POST = array_map('stripslashes_deep', $_POST);

        $options = get_option('abovethefold');
        if (!is_array($options)) {
            $options = array();
        }

        // input
        $input = (isset($_POST['abovethefold']) && is_array($_POST['abovethefold'])) ? $_POST['abovethefold'] : array();

        /**
         * Optimize CSS delivery
         */
        $options['html_minify'] = (isset($input['html_minify']) && intval($input['html_minify']) === 1) ? true : false;
        $options['html_comments'] = (isset($input['html_comments']) && intval($input['html_comments']) === 1) ? true : false;
        $options['html_comments_preserve'] = $this->CTRL->admin->newline_array($input['html_comments_preserve']);
        $options['html_search_replace'] = (isset($input['html_search_replace'])) ? @json_decode($input['html_search_replace'], true) : array();
        if (!is_array($options['html_search_replace'])) {
            $options['html_search_replace'] = array();
        }
        if (!empty($options['html_search_replace'])) {
            $searchreplace = array();
            $position = 0;
            foreach ($options['html_search_replace'] as $cnf) {
                if (!is_array($cnf) || !isset($cnf['search']) || !isset($cnf['replace'])) {
                    continue;
                }
                $position++;
                if (isset($cnf['regex'])) {
                    // exec preg_match on null
                    $valid = @preg_match($cnf['search'], null);
                    $error = $this->is_preg_error();
                    if ($valid === false || $error) {
                        $this->CTRL->admin->set_notice('The HTML Search & Replace configuration <code>'.esc_html($cnf['search']).'</code> is an invalid regular expression and has been removed.' . (($error) ? '<br /><p>Error: '.$error.'</p>' : ''), 'ERROR');
                        continue 1;
                    }
                }
                $searchreplace[] = $cnf;
            }
            $options['html_search_replace'] = $searchreplace;
        }

        // update settings
        $this->CTRL->admin->save_settings($options, 'HTML optimization settings saved.');

        wp_redirect(add_query_arg(array( 'page' => 'pagespeed-html' ), admin_url('admin.php')));
        exit;
    }
    
    /**
     * Enqueue scripts and styles
     */
    public function enqueue_scripts($hook)
    {
        if (!isset($_REQUEST['page']) || $_GET['page'] !== 'pagespeed-html') {
            return;
        }

        // add global admin CSS
        wp_enqueue_style('abtf_admincp_jsoneditor', plugin_dir_url(__FILE__) . 'js/jsoneditor/jsoneditor.min.css', false, WPABTF_VERSION);
        wp_enqueue_style('abtf_admincp_html', plugin_dir_url(__FILE__) . 'css/admincp-jsoneditor.min.css', false, WPABTF_VERSION);

        // add general admin javascript
        wp_enqueue_script('abtf_admincp_jsoneditor', plugin_dir_url(__FILE__) . 'js/jsoneditor/jsoneditor.min.js', array( 'jquery' ), WPABTF_VERSION);
        wp_enqueue_script('abtf_admincp_html', plugin_dir_url(__FILE__) . 'js/admincp-html.min.js', array( 'jquery', 'abtf_admincp_jsoneditor' ), WPABTF_VERSION);
    }

    /**
     * Preg error
     */
    public function is_preg_error()
    {
        if (!function_exists('preg_last_error')) {
            return false;
        }
        $error = preg_last_error();

        // no error
        if ($error === PREG_NO_ERROR) {
            return false;
        }

        $errors = array(
            PREG_INTERNAL_ERROR         => 'Code 1 : There was an internal PCRE error',
            PREG_BACKTRACK_LIMIT_ERROR  => 'Code 2 : Backtrack limit was exhausted',
            PREG_RECURSION_LIMIT_ERROR  => 'Code 3 : Recursion limit was exhausted',
            PREG_BAD_UTF8_ERROR         => 'Code 4 : The offset didn\'t correspond to the begin of a valid UTF-8 code point',
            PREG_BAD_UTF8_OFFSET_ERROR  => 'Code 5 : Malformed UTF-8 data',
        );
        return $errors[$error];
    }
}