<?php

if (!defined('ABSPATH')) {
die('No direct access.');
}

/**
 * Check for common issues with the server environment and WordPress install.
 */
class MetaSliderSystemCheck
{
    /**
     * System check options
     *
     * @var array
     */
    private $options = array();
    
    /**
     * Current slideshow ID
     *
     * @var int
     */
    private $slideshow_id;

    /**
     * Constructor
     * 
     * @param int|null $slideshow_id The current slideshow ID
     */
    public function __construct($slideshow_id = null)
    {
        $this->slideshow_id = $slideshow_id;
        $this->options = get_site_option('metaslider_systemcheck');
    }

    /**
     * Check the system
     */
    public function check()
    {
        $this->dismissMessages();
        $this->checkMaxInputVars();
        $this->checkWordPressVersion();
        $this->checkImageLibrary();
        $this->checkRoleScoper();
        // $this->checkWpFooter();
        $this->updateSystemCheck();
    }

    /**
     * Disable a message
     */
    private function dismissMessages()
    {
        if (isset($_REQUEST['dismissMessage']) && isset($_REQUEST['_wpnonce'])) {
            $nonce = sanitize_key($_REQUEST['_wpnonce']);
            $key = sanitize_key($_REQUEST['dismissMessage']);

            if (wp_verify_nonce($nonce, "metaslider-dismiss-{$key}")) {
                $this->options[$key] = false;
                update_site_option('metaslider_systemcheck', $this->options);
            }
        }
    }

    /**
     * Update our stored messages
     */
    private function updateSystemCheck()
    {
        update_site_option('metaslider_systemcheck', $this->options);
    }

    /**
     * Check if the server can handle saving
     */
    private function checkMaxInputVars()
    {
        if (!isset($_GET['input_vars_error'])) {
return;
        }

        // max_input_vars is not available < PHP5.3.9
        if (version_compare(phpversion(), '5.3.9', '<')) {
return;
        }
        $max_input_vars = ini_get('max_input_vars'); // phpcs:ignore PHPCompatibility.IniDirectives.NewIniDirectives.max_input_varsFound

        $error = sprintf(
            __('Your settings might not be saving properly due to a configuration on your server. %s is currently set to %s, but we recommend a setting of 4000. Please see %s for more information. The php.ini file is being loaded from here: %s', 'ml-slider'),
            '<code>max_input_vars</code>',
            $max_input_vars,
            sprintf('<a target="_blank" href="https://www.metaslider.com/faqs/settings-on-my-slideshow-are-not-saving/" class="text-blue underline">%s</a>', __('this article', 'ml-slider')),
            '<code>' . php_ini_loaded_file() . '</code>'
        );

        $this->printMessage($error, 'maxInputVars', 'dismissable');
    }

    /**
     * Check the WordPress version.
     */
    private function checkWordPressVersion()
    {
        if (!is_array($this->options)) {
            $this->options = [];
        }
        
        if (!isset($this->options['wordPressVersion']) || !is_bool($this->options['wordPressVersion'])) {
            $this->options['wordPressVersion'] = null;
        }

        if ($this->options['wordPressVersion'] === true) {
            return;
        }

        if (!function_exists('wp_enqueue_media')) {
            $error = "MetaSlider requires WordPress 3.5 or above. Please upgrade your WordPress installation.";
            $this->printMessage($error, 'wordPressVersion');
        } else {
            $this->options['wordPressVersion'] = true;
        }
    }

    /**
     * Check GD or ImageMagick library exists
     */
    private function checkImageLibrary()
    {
        if (isset($this->options['imageLibrary']) && $this->options['imageLibrary'] === false) {
            return;
        }

        if (( !extension_loaded('gd') || !function_exists('gd_info') ) && ( !extension_loaded('imagick') || !class_exists('Imagick') || !class_exists('ImagickPixel') )) {
            $error = "MetaSlider requires the GD or ImageMagick PHP extension. Please contact your hosting provider";
            $this->printMessage($error, 'imageLibrary');
        } else {
            $this->options['imageLibrary'] = false;
        }
    }

    /**
     * Detect the role scoper plugin
     */
    private function checkRoleScoper()
    {
        if (isset($this->options['roleScoper']) && $this->options['roleScoper'] === false) {
            return;
        }

        if (function_exists('is_plugin_active') && is_plugin_active('role-scoper/role-scoper.php')) {
            $access_types = get_option('scoper_disabled_access_types');

            if (isset($access_types['front']) && !$access_types['front']) {
                $error = 'Role Scoper Plugin Detected. Please go to Roles > Options. Click the Realm Tab, scroll down to "Access Types" and uncheck the "Viewing content (front-end)" setting.';
                $this->printMessage($error, 'roleScoper');
            }
        }
    }

    /**
     * Check the theme has a call to 'wp_footer'
     */
    private function checkWpFooter()
    {
        $current_theme = wp_get_theme();
        $theme_name = $current_theme->Template;

        $key = 'wpFooter:' . $theme_name;

        if (isset($this->options[$key]) && $this->options[$key] === false) {
            return;
        }

        $child_footer = get_stylesheet_directory() . '/footer.php';
        $parent_footer = TEMPLATEPATH . '/footer.php';
        $theme_type = 'parent';

        if (file_exists($child_footer)) {
            $theme_type = 'child';
            $footer_file = file_get_contents($child_footer);

            if (strpos($footer_file, 'wp_footer()')) {
                return;
            }
        } else if (file_exists($parent_footer . '/footer.php')) {
                $theme_type = 'parent';
                $footer_file = file_get_contents($parent_footer . '/footer.php');

            if (strpos($footer_file, 'wp_footer()')) {
                return;
            }
        }

        if ($theme_type == 'parent') {
            $file_path = $parent_footer;
        } else {
            $file_path = $child_footer;
        }

        $error = "Required call to wp_footer() not found in file <b>{$file_path}</b>. <br /><br />Please check the <a href='http://codex.wordpress.org/Function_Reference/wp_footer'>wp_footer()</a> documentation and make sure your theme has a call to wp_footer() just above the closing </body> tag.";
        $this->printMessage($error, $key);
    }

    /**
     * Print a warning message to the screen
     *
     * @param string $message Warning message to be shown
     * @param string $key     Message Key
     * @param string $style   The functional style of the notice
     */
    private function printMessage($message, $key, $style = 'dismissable')
    {
        $nonce = wp_create_nonce("metaslider-dismiss-{$key}");
        $message = sprintf('<strong>%s</strong> ', esc_html__('Warning:', 'ml-slider')) . $message;
        // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
        echo "<div id='message' class='updraft-ad-container notice updated metaslider-admin-notice'>
			<p class='m-0 p-2'>{$message}</p>";
        if ('dismissable' === $style) {
            echo "<div class='updraft-advert-dismiss'>
                <a class='underline text-blue-dark'  href='" . esc_url('?page=metaslider&dismissMessage=' . $key . '&' . '_wpnonce=' . $nonce) . ">Dismiss</a>
			</div>";
        }
        echo "</div>";
    }
}