<?php
/**
 * Admin area setup stuff
 *
 * @package wpmu-dev-seo
 */

/**
 * Admin area instance page abstraction
 */
abstract class Smartcrawl_Settings_Admin extends Smartcrawl_Settings {

	/**
	 * Sections
	 *
	 * @var array
	 */
	public $sections = array();

	/**
	 * Settings corresponding to this page
	 *
	 * @var array
	 */
	public $options = array();

	/**
	 * Capability required for this page
	 *
	 * @var string
	 */
	public $capability = 'list_users';

	/**
	 * Name of the options corresponding to this page
	 *
	 * @var string
	 */
	public $option_name = '';

	/**
	 * Page name
	 *
	 * @var string
	 */
	public $name = '';

	/**
	 * Page slug
	 *
	 * @var string
	 */
	public $slug = '';

	/**
	 * Action URL
	 *
	 * @var string
	 */
	public $action_url = '';

	/**
	 * Action message
	 *
	 * @var string
	 */
	public $msg = '';

	/**
	 * Current page hook
	 *
	 * @var string
	 */
	public $smartcrawl_page_hook = '';

	/**
	 * Blog tabs
	 *
	 * @var array
	 */
	public $blog_tabs = array();

	/**
	 * Constructor
	 */
	protected function __construct() {
		if ( is_multisite() && SMARTCRAWL_SITEWIDE ) {
			$this->capability = 'manage_network_options';
		}

		$this->init();

	}

	/**
	 * Initializes the interface and binds hooks
	 */
	public function init() {
		$this->options = self::get_specific_options( $this->option_name );
		if ( is_multisite() && defined( 'SMARTCRAWL_SITEWIDE' ) && SMARTCRAWL_SITEWIDE ) {
			$this->capability = 'manage_network_options';
		}

		add_action( 'init', array( $this, 'defaults' ), 999 );
		add_action( 'admin_body_class', array( $this, 'add_body_class' ), 20 );

		if ( is_multisite() && smartcrawl_is_switch_active( 'SMARTCRAWL_SITEWIDE' ) ) {
			add_action( 'network_admin_menu', array( $this, 'add_page' ) );
		} else {
			add_action( 'admin_menu', array( $this, 'add_page' ) );
		}
	}

	private function is_current_screen() {
		$screen = get_current_screen();
		return ! empty( $screen->id )
		       && ! empty( $this->smartcrawl_page_hook )
		       && strpos( $screen->id, $this->smartcrawl_page_hook ) === 0;
	}

	/**
	 * Unified admin tab URL getter
	 *
	 * Also takes into account whether the tab is allowed or not
	 *
	 * @param string $tab Tab to check.
	 *
	 * @return string Unescaped admin URL, or tab anchor on failure
	 */
	public static function admin_url( $tab ) {
		$single_site_url = esc_url_raw( add_query_arg( 'page', $tab, admin_url( 'admin.php' ) ) );
		if ( ! is_multisite() ) {
			return $single_site_url;
		}

		$network_admin_url = esc_url_raw( add_query_arg( 'page', $tab, network_admin_url( 'admin.php' ) ) );
		$sitewide = smartcrawl_is_switch_active( 'SMARTCRAWL_SITEWIDE' );

		return $sitewide
			? $network_admin_url
			: $single_site_url;
	}

	/**
	 * Validation abstraction
	 *
	 * @param array $input Raw input to validate.
	 *
	 * @return array
	 */
	abstract public function validate( $input );

	/**
	 * Add sub page to the Settings Menu
	 */
	public function add_page() {
		if ( ! $this->_is_current_tab_allowed() ) {
			return false;
		}

		$this->smartcrawl_page_hook = add_submenu_page(
			'wds_wizard',
			$this->page_title,
			$this->get_title(),
			$this->capability,
			$this->slug,
			array( $this, 'options_page' )
		);

		// For pages that can deal with run requests, let's make sure they actually do that early enough.
		if ( is_callable( array( $this, 'process_run_action' ) ) ) {
			add_action( 'load-' . $this->smartcrawl_page_hook, array( $this, 'process_run_action' ) );
		}

		add_action( "admin_print_styles-{$this->smartcrawl_page_hook}", array( $this, 'admin_styles' ) );
	}

	abstract public function get_title();

	/**
	 * Check if the current tab (settings page) is allowed for access
	 *
	 * @return bool
	 */
	protected function _is_current_tab_allowed() {
		return ! empty( $this->slug )
			? self::is_tab_allowed( $this->slug )
			: false;
	}

	/**
	 * Check if a tab (settings page) is allowed for access
	 *
	 * It can be not allowed for access to site admins
	 *
	 * @param string $tab Tab to check.
	 *
	 * @return bool
	 */
	public static function is_tab_allowed( $tab ) {
		// On single installs, everything is good
		if ( ! is_multisite() ) {
			return true;
		}

		// Always good in network
		if ( is_network_admin() ) {
			return true;
		}

		// If we're sitewide, we're good *in network admin* pages
		if ( smartcrawl_is_switch_active( 'SMARTCRAWL_SITEWIDE' ) ) {
			return smartcrawl_is_switch_active( 'DOING_AJAX' )
				? true
				: is_network_admin();
		}

		// We're network install and not sitewide.
		// Now let's see what's up.

		// SEO checkup not supported on sub-sites
		if ( $tab === self::TAB_CHECKUP ) {
			return is_main_site();
		}

		// Dashboard shown on all sub-sites
		if ( $tab === self::TAB_DASHBOARD ) {
			return true;
		}

		// Check whether the tab is blocked on network level
		$allowed = Smartcrawl_Settings_Settings::get_blog_tabs();
		$allowed = empty( $allowed ) ? array() : $allowed;
		return in_array( $tab, array_keys( $allowed ), true ) && ! empty( $allowed[ $tab ] );
	}

	/**
	 * Enqueue styles
	 */
	public function admin_styles() {
		wp_enqueue_style( Smartcrawl_Controller_Assets::APP_CSS );
	}

	/**
	 * Initiates a checkup run
	 */
	public function run_checkup() {
		if ( current_user_can( 'manage_options' ) ) {
			$service = Smartcrawl_Service::get( Smartcrawl_Service::SERVICE_CHECKUP );
			$service->start();
		}
		wp_safe_redirect( esc_url( remove_query_arg( array( 'run-checkup', '_wds_nonce' ) ) ) );
		die;
	}

	/**
	 * Display the admin options page
	 */
	public function options_page() {
		// phpcs:disable -- $_GET values need to be used without nonces
		$this->msg = '';
		if ( ! empty( $_GET['updated'] ) || ! empty( $_GET['settings-updated'] ) ) {
			$this->msg = __( 'Settings updated', 'wds' );

			if ( function_exists( 'w3tc_pgcache_flush' ) ) {
				w3tc_pgcache_flush();
				$this->msg .= __( ' &amp; W3 Total Cache Page Cache flushed', 'wds' );
			} elseif ( function_exists( 'wp_cache_clear_cache' ) ) {
				wp_cache_clear_cache();
				$this->msg .= __( ' &amp; WP Super Cache flushed', 'wds' );
			}
		}

		$errors = get_settings_errors( $this->option_name );
		if ( $errors ) {
			set_transient( 'wds-settings-save-errors', $errors, 3 );
		}
		// phpcs:enable
	}

	/**
	 * Sets up contextual help
	 *
	 * @param string $contextual_help Help.
	 *
	 * @return string
	 */
	public function contextual_help( $contextual_help ) {
		$page = smartcrawl_get_array_value( $_GET, 'page' ); // phpcs:ignore -- Can't add nonce to the request
		if ( ! empty( $page ) && $page === $this->slug && ! empty( $this->contextual_help ) ) {
			$contextual_help = $this->contextual_help;
		}

		return $contextual_help;
	}

	/**
	 * Adds body class
	 *
	 * @param string $classes Class that's being processed.
	 *
	 * @return string
	 */
	public function add_body_class( $classes ) {
		$sui_class = smartcrawl_sui_class();
		if ( $this->is_current_screen() && strpos( $classes, $sui_class ) === false ) {
			$classes .= " {$sui_class} ";
		}

		return $classes;
	}

	/**
	 * Renders the whole page view by calling `_render`
	 *
	 * As a side-effect, also calls `WDEV_Plugin_Ui::output()`
	 *
	 * @param string $view View file to load.
	 * @param array $args Optional array of arguments to pass to view.
	 *
	 * @return bool
	 */
	protected function _render_page( $view, $args = array() ) {
		$this->_render( $view, $args );

		return true;
	}

	protected function settings_fields( $option_group ) {
		echo "<input type='hidden' name='option_page' value='" . esc_attr( $option_group ) . "' />";
		echo '<input type="hidden" name="action" value="update" />';
		wp_nonce_field( "$option_group-options", "_wpnonce", false );
	}

	/**
	 * Populates view defaults with view meta information
	 *
	 * @return array Defaults
	 */
	protected function _get_view_defaults() {
		$errors = get_transient( 'wds-settings-save-errors' );
		$errors = ! empty( $errors ) ? $errors : array();
		$service = Smartcrawl_Service::get( Smartcrawl_Service::SERVICE_SITE );

		return array(
			'_view' => array(
				'slug'        => $this->slug,
				'name'        => $this->name,
				'option_name' => $this->option_name,
				'options'     => $this->options,
				'action_url'  => $this->action_url,
				'msg'         => $this->msg,
				'errors'      => $errors,
				'is_member'   => $service->is_member(),
			),
		);
	}

	/**
	 * Checks if the last active tab is stored in the transient and returns its value. If nothing is available then it returns the default value.
	 *
	 * @param string $default Fallback value.
	 *
	 * @return string The last active tab.
	 */
	protected function _get_active_tab( $default = '' ) {
		return empty( $_GET['tab'] )
			? $default
			: $_GET['tab'];
	}
}