\dirname( $this->yoast_seo_file ) . '/wp-seo.php';
		}

		$this->ensure_yoast_seo_is_activated();
		$this->transfer_auto_update_settings();
		// Mark the installer as having been completed.
		\update_option( self::OPTION_KEY, 'completed', true );
	}

	/**
	 * Loads Yoast SEO from the vendor directory.
	 *
	 * @return void
	 */
	protected function load_yoast_seo_from_vendor_directory() {
		if ( \file_exists( $this->base_dir . '/vendor/yoast/wordpress-seo/wp-seo.php' ) ) {
			require_once $this->base_dir . '/vendor/yoast/wordpress-seo/wp-seo.php';
			\register_activation_hook( \WPSEO_PREMIUM_FILE, 'wpseo_activate' );
			\register_deactivation_hook( \WPSEO_PREMIUM_FILE, 'wpseo_deactivate' );
		}
	}

	/**
	 * Detects the Yoast SEO plugin file and version.
	 *
	 * @return void
	 */
	protected function detect_yoast_seo() {
		// Make sure Yoast SEO isn't already installed in another directory.
		foreach ( \get_plugins() as $file => $plugin ) {
			// Use text domain to identify the plugin as it's the closest thing to a slug.
			if (
				isset( $plugin['TextDomain'] ) && $plugin['TextDomain'] === 'wordpress-seo'
				&& isset( $plugin['Name'] ) && $plugin['Name'] === 'Yoast SEO'
			) {
				$this->yoast_seo_file    = $file;
				$this->yoast_seo_version = isset( $plugin['Version'] ) ? $plugin['Version'] : '0';
				$this->yoast_seo_dir     = \WP_PLUGIN_DIR . '/' . \dirname( $file );
			}
		}
	}

	/**
	 * Asserts the vendor directory exists.
	 *
	 * @return void
	 *
	 * @throws Exception If the required vendor directory does not exist.
	 */
	protected function ensure_vendor_directory_exists() {
		// If Yoast SEO no longer exists in the vendor directory then abort.
		if ( ! \file_exists( $this->base_dir . '/vendor/yoast/wordpress-seo/wp-seo.php' ) ) {
			throw new Exception( 'Missing Yoast SEO in Yoast SEO Premium vendor.' );
		}
	}

	/**
	 * Cleans the target directory.
	 *
	 * @return void
	 *
	 * @throws Exception If the target directory could not be cleaned.
	 */
	protected function clean_target_directory() {
		if ( \file_exists( \WP_PLUGIN_DIR . '/' . $this->yoast_seo_file ) ) {
			if ( \file_exists( $this->yoast_seo_dir . '/.git' ) ) {
				throw new Exception( 'Existing Yoast SEO installation has a .git directory, refusing to automatically install.' );
			}
			if ( ! $this->remove_directory( $this->yoast_seo_dir ) ) {
				throw new Exception( 'Could not remove old Yoast SEO installation.' );
			}
		}
	}

	/**
	 * Removes a directory and all it's contents.
	 *
	 * @param string $directory The full path to the directory.
	 *
	 * @return bool Whether or not the remove was succesfull.
	 */
	protected function remove_directory( $directory ) {
		$items = \scandir( $directory );
		foreach ( $items as $item ) {
			if ( $item === '.' || $item === '..' ) {
				continue;
			}

			$path = $directory . '/' . $item;
			if ( \is_dir( $path ) ) {
				if ( ! $this->remove_directory( $path ) ) {
					return false;
				}
				continue;
			}
			if ( ! \unlink( $path ) ) {
				return false;
			}
		}
		return \rmdir( $directory );
	}

	/**
	 * Moves the vendor directory to the target directory.
	 *
	 * @return void
	 *
	 * @throws Exception If the move failed.
	 */
	protected function move_vendor_directory() {
		// phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged -- Prevent a potential PHP warning on Windows.
		if ( ! @\rename( $this->base_dir . '/vendor/yoast/wordpress-seo', $this->yoast_seo_dir ) ) {
			throw new Exception( 'Could not automatically install Yoast SEO' );
		}
	}

	/**
	 * Activates Yoast SEO.
	 *
	 * @return void
	 *
	 * @throws Exception If Yoast SEO could not be activated.
	 */
	protected function ensure_yoast_seo_is_activated() {
		if ( ! \is_plugin_active( $this->yoast_seo_file ) ) {
			$network_active = \is_plugin_active_for_network( \WPSEO_PREMIUM_BASENAME );
			// If we're not active at all it means we're being activated.
			if ( ! $network_active && ! \is_plugin_active( \WPSEO_PREMIUM_BASENAME ) ) {
				// So set network active to whether or not we're in the network admin.
				$network_active = \is_network_admin();
			}
			// Activate Yoast SEO. If Yoast SEO Premium is network active then make sure Yoast SEO is as well.
			$activation = \activate_plugin( $this->yoast_seo_file, '', $network_active );
			if ( \is_wp_error( $activation ) ) {
				throw new Exception( 'Could not activate Yoast SEO: ' . $activation->get_error_message() );
			}
		}
	}

	/**
	 * Transfers the auto update settings for Yoast SEO Premium to Yoast SEO.
	 *
	 * @return void
	 */
	protected function transfer_auto_update_settings() {
		$auto_updates = (array) \get_site_option( 'auto_update_plugins', [] );

		if ( \in_array( \WPSEO_PREMIUM_BASENAME, $auto_updates, true ) ) {
			$auto_updates[] = $this->yoast_seo_file;
			$auto_updates   = \array_unique( $auto_updates );
			\update_site_option( 'auto_update_plugins', $auto_updates );
		}
	}

	/**
	 * Wether or not the notification to install Yoast SEO should be shown.
	 *
	 * This is copied from the Yoast_Admin_And_Dashboard_Conditional which we can't use as Yoast SEO may not be installed.
	 *
	 * @return bool
	 */
	protected function should_show_notification() {
		global $pagenow;

		// Do not output on plugin / theme upgrade pages or when WordPress is upgrading.
		if ( ( \defined( 'IFRAME_REQUEST' ) && \IFRAME_REQUEST ) || \wp_installing() ) {
			return false;
		}

		/*
		 * IFRAME_REQUEST is not defined on these pages,
		 * though these action pages do show when upgrading themes or plugins.
		 */
		$actions = [ 'do-theme-upgrade', 'do-plugin-upgrade', 'do-core-upgrade', 'do-core-reinstall' ];
		if ( isset( $_GET['action'] ) && \in_array( $_GET['action'], $actions, true ) ) {
			return false;
		}

		// phpcs:ignore WordPress.Security.ValidatedSanitizedInput -- Only a strpos is done in the input.
		if ( $pagenow === 'admin.php' && isset( $_GET['page'] ) && \strpos( $_GET['page'], 'wpseo' ) === 0 ) {
			return true;
		}

		$target_pages = [
			'index.php',
			'plugins.php',
			'update-core.php',
			'options-permalink.php',
		];

		return \in_array( $pagenow, $target_pages, true );
	}
}