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Edit: /home/melaqxso/public_html/wp-content/plugins/bookly-addon-tasks/lib/Boot.php

<?php
namespace BooklyTasks\Lib;

/**
 * Class Boot
 * @package BooklyTasks\Lib
 */
class Boot
{
    public static $plugin_title = 'Bookly Tasks (Add-on)';
    public static $req_plugin_class = 'BooklyPro\Lib\Plugin';
    public static $req_version = '5.0';

/**
     * Boot up.
     */
    public static function up()
    {
        $main_file = self::mainFile();
        $plugin    = self::pluginClass();

// Register activation/deactivation hooks.
        if ( self::embedded() ) {
            add_action( 'deactivate_bookly-addon-pro/main.php', array( $plugin, 'deactivate' ), 99, 1 );
        } else {
            register_activation_hook( $main_file, function ( $network_wide ) use ( $plugin ) {
                if ( Boot::checkEnv() ) {
                    $plugin::activate( $network_wide );
                }
            } );
            register_deactivation_hook( $main_file, function ( $network_wide ) use ( $plugin ) {
                if ( Boot::checkEnv() ) {
                    $plugin::deactivate( $network_wide );
                }
            } );
            register_uninstall_hook( $main_file, array( __CLASS__, 'uninstall' ) );
        }

// Run plugin.
        add_action( 'plugins_loaded', function () use ( $plugin, $main_file ) {
            if ( Boot::checkEnv() ) {
                $plugin::run();
            } else {
                // Deactivate plugin.
                add_action( 'init', function () use ( $main_file ) {
                    if ( current_user_can( 'activate_plugins' ) ) {
                        add_action( 'admin_init', function () use ( $main_file ) {
                            deactivate_plugins( $main_file, false, is_network_admin() );
                        } );
                        add_action( is_network_admin() ? 'network_admin_notices' : 'admin_notices', function () {
                            printf( '<div class="updated"><h3>%s</h3><p>The plugin has been <strong>deactivated</strong>.</p><p><strong>Bookly Pro v%s</strong> is required.</p></div>',
                                Boot::$plugin_title,
                                Boot::$req_version
                            );
                        } );
                        unset ( $_GET['activate'], $_GET['activate-multi'] );
                    }
                } );
            }
        } );
    }

/**
     * Check environment.
     *
     * @return bool
     */
    public static function checkEnv()
    {
        return class_exists( 'Bookly\Lib\Base\Plugin' ) &&
            class_exists( self::$req_plugin_class ) &&
            version_compare( call_user_func( array( self::$req_plugin_class, 'getVersion' ) ), self::$req_version, '>=' );
    }

/**
     * Uninstall plugin.
     *
     * @param $network_wide
     */
    public static function uninstall( $network_wide )
    {
        if ( ! self::embedded() ) {
            if ( $network_wide !== false && has_action( 'bookly_plugin_uninstall' ) ) {
                $slug = basename( dirname( __DIR__ ) );
                do_action( 'bookly_plugin_uninstall', $slug );
            } else {
                /** @var Base\Installer $installer */
                $installer_class = strtok( __NAMESPACE__, '\\' ) . '\Lib\Installer';
                $installer       = new $installer_class();
                $installer->uninstall();
            }
        }
    }

/**
     * Get path to plugin main file.
     *
     * @return string
     */
    public static function mainFile()
    {
        return dirname( __DIR__ ) . '/main.php';
    }

/**
     * Get plugin class.
     *
     * @return \Bookly\Lib\Base\Plugin
     */
    public static function pluginClass()
    {
        return strtok( __NAMESPACE__, '\\' ) . '\Lib\Plugin';
    }

/**
     * Check whether add-on is embedded or not.
     *
     * @return bool
     */
    public static function embedded()
    {
        return strpos( self::mainFile(), DIRECTORY_SEPARATOR . 'lib' . DIRECTORY_SEPARATOR . 'addons' . DIRECTORY_SEPARATOR ) > 0;
    }
}

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