<?php
/**
 * Handles issues with plugin and version compatibility
 *
 * @since     1.12
 * @license   GPL2+
 * @author    GravityKit <hello@gravitykit.com>
 * @link      http://www.gravitykit.com
 * @copyright Copyright 2015, Katz Web Services, Inc.
 *
 * @package   GravityView
 */

/**
 * Handles GravityView compatibility notices and fallback shortcodes.
 *
 * @since 1.12
 */
class GravityView_Compatibility {
	/**
	 * @var GravityView_Compatibility
	 */
	public static $instance = null;

	/**
	 * @var bool Is Gravity Forms version valid and is Gravity Forms loaded?
	 */
	public static $valid_gravity_forms = false;

	/**
	 * @var bool Is the WordPress installation compatible?
	 */
	public static $valid_wordpress = false;

	/**
	 * @var array Holder for notices to be displayed in frontend shortcodes if not valid GF.
	 */
	private static $notices = [];

	private function __construct() {
		self::$valid_gravity_forms = self::check_gravityforms();

		self::$valid_wordpress = self::check_wordpress();

		self::check_php();

		self::check_gf_directory();

		add_action( 'gk/foundation/initialized', [ $this, 'register_compatibility_notices' ] );

		$this->add_fallback_shortcode();
	}

	/**
	 * Registers notices.
	 *
	 * @internal
	 *
	 * @since 2.45
	 *
	 * @return void
	 */
	public function register_compatibility_notices() {
		if ( empty( self::$notices ) ) {
			return;
		}

		if ( ! class_exists( 'GravityKitFoundation' ) ) {
			return;
		}

		$notice_manager = GravityKitFoundation::notices();

		if ( ! $notice_manager ) {
			return;
		}

		foreach ( self::$notices as $notice ) {
			try {
				$notice_manager->add_runtime( $notice );
			} catch ( Throwable $e ) {
				gravityview()->log->debug( 'Failed to register compatibility notice with Foundation: ' . $e->getMessage(), [ 'notice' => $notice ] );
			}
		}

		self::$notices = [];
	}

	/**
	 * @return GravityView_Compatibility
	 */
	public static function getInstance() {
		if ( self::$instance ) {
			return self::$instance;
		}

		self::$instance = new self();

		return self::$instance;
	}

	/**
	 * Is everything compatible with this version of GravityView?
	 *
	 * @deprecated 1.19.4
	 *
	 * @see        \GV\Plugin::is_compatible() accessible via gravityview()->plugin->is_compatible()
	 *
	 * @return bool
	 */
	public static function is_valid() {
		return gravityview()->plugin->is_compatible();
	}

	/**
	 * Is the version of WordPress compatible?
	 *
	 * @deprecated 1.19.4
	 *
	 * @since      1.12
	 *
	 * @see        \GV\Plugin::is_compatible_wordpress() accessible via gravityview()->plugin->is_compatible_wordpress()
	 */
	private static function is_valid_wordpress() {
		return gravityview()->plugin->is_compatible_wordpress();
	}

	/**
	 * @deprecated 1.19.4
	 *
	 * @since      1.12
	 *
	 * @see        \GV\Plugin::is_compatible_gravityforms() accessible via gravityview()->plugin->is_compatible_gravityforms()
	 *
	 * @return bool
	 */
	private static function is_valid_gravity_forms() {
		return gravityview()->plugin->is_compatible_gravityforms();
	}

	/**
	 * @since 1.12
	 *
	 * @return void
	 */
	private function add_fallback_shortcode() {
		// If Gravity Forms doesn't exist or is outdated, load the admin view class to.
		// show the notice, but not load any post types or process shortcodes.
		// Without Gravity Forms, there is no GravityView. Beautiful, really.
		if ( ! gravityview()->plugin->is_compatible() ) {
			// If the plugin's not loaded, might as well hide the shortcode for people.
			add_shortcode( 'gravityview', [ $this, '_shortcode_gf_notice' ] );
		}
	}

	/**
	 * Returns admin notices.
	 *
	 * @since 1.12
	 *
	 * @return array
	 */
	public static function get_notices() {
		return self::$notices;
	}

	/**
	 * @since 1.9.2 in gravityview.php
	 * @since 1.12
	 *
	 * @param array  $atts
	 * @param null   $content
	 * @param string $shortcode
	 *
	 * @return null|string NULL returned if user can't activate plugins. Notice shown with a warning that GF isn't supported.
	 */
	public function _shortcode_gf_notice( $atts = [], $content = null, $shortcode = 'gravityview' ) {
		if ( ! GVCommon::has_cap( 'activate_plugins' ) ) {
			return null;
		}

		$notices = self::get_notices();

		$message = esc_html__( 'You are seeing this notice because you are an administrator. Other users of the site will see nothing.', 'gk-gravityview' );

		foreach ( $notices as $notice ) {
			$message .= wpautop( $notice['message'] );
		}
		$message .= '</div>';

		return $message;
	}

	/**
	 * Is the version of PHP compatible?
	 *
	 * @since 1.12
	 * @since 1.19.2 Shows a notice if it's compatible with future PHP version requirements
	 *
	 * @return void
	 */
	public static function check_php() {
		if ( ! gravityview()->plugin->is_compatible_future_php() ) {
			// Show the notice on every update. Yes, annoying, but not as annoying as a plugin breaking.
			$key = sprintf( 'php_%s_%s', GV_FUTURE_MIN_PHP_VERSION, GV_PLUGIN_VERSION );

			self::$notices[ $key ] = [
				'namespace'    => 'gk-gravityview',
				'slug'         => $key,
				'message'      => sprintf( __( "%1\$sGravityView will soon require PHP Version %2\$s.%3\$s \n\nYou're using Version %4\$s. Please ask your host to upgrade your server's PHP.", 'gk-gravityview' ), '', GV_FUTURE_MIN_PHP_VERSION, '', '<strong>' . phpversion() . '</strong>' ),
				'severity'     => 'warning',
				'capabilities' => [ 'manage_options' ],
				'dismissible'  => true,
				'screens'      => [ [ __CLASS__, 'should_show_notice' ] ],
				'context'      => 'all',
			];
		}

		return true;
	}

	/**
	 * Is WordPress compatible?
	 *
	 * @since 1.12
	 * @return boolean
	 */
	public static function check_wordpress() {
		global $wp_version;

		if ( gravityview()->plugin->is_compatible_future_wordpress() ) {
			return true;
		}

		if ( ! gravityview()->plugin->is_compatible_wordpress() ) {
			self::$notices['wp_version'] = [
				'namespace'    => 'gk-gravityview',
				'slug'         => 'wp_version',
				'message'      => sprintf( __( "%1\$sGravityView requires WordPress %2\$s or newer.%3\$s \n\nYou're using Version %4\$s. Please upgrade your WordPress installation.", 'gk-gravityview' ), '', GV_MIN_WP_VERSION, '', '<strong>' . $wp_version . '</strong>' ),
				'severity'     => 'error',
				'capabilities' => [ 'update_core' ],
				'dismissible'  => true,
				'screens'      => [ [ __CLASS__, 'should_show_notice' ] ],
				'context'      => 'all',
			];

			return false;
		}

		// Show the notice on every update. Yes, annoying, but not as annoying as a plugin breaking.
		$key = sprintf( 'wp_%s_%s', GV_FUTURE_MIN_WP_VERSION, GV_PLUGIN_VERSION );

		self::$notices[ $key ] = [
			'namespace'    => 'gk-gravityview',
			'slug'         => $key,
			'message'      => sprintf( __( "%1\$sGravityView will soon require WordPress %2\$s%3\$s \n\nYou're using Version %4\$s. Please upgrade your WordPress installation.", 'gk-gravityview' ), '', GV_FUTURE_MIN_WP_VERSION, '', '<strong>' . $wp_version . '</strong>' ),
			'severity'     => 'warning',
			'capabilities' => [ 'update_core' ],
			'dismissible'  => true,
			'screens'      => [ [ __CLASS__, 'should_show_notice' ] ],
			'context'      => 'all',
		];

		return true;
	}


	/**
	 * Checks if Gravity Forms plugin is active and show notice if not.
	 *
	 * @since 1.12
	 *
	 * @return boolean True: checks have been passed; GV is fine to run; False: checks have failed, don't continue loading
	 */
	public static function check_gravityforms() {
		// Bypass other checks: if the class exists.
		if ( class_exists( 'GFCommon' ) ) {
			// Does the version meet future requirements?
			if ( true === gravityview()->plugin->is_compatible_future_gravityforms() ) {
				return true;
			}

			// Does it meet minimum requirements?
			$meets_minimum = gravityview()->plugin->is_compatible_gravityforms();

			$messages = [];

			if ( $meets_minimum ) {
				/* translators: first placeholder is the future required version of Gravity Forms. The second placeholder is the current version of Gravity Forms. */
				$messages[] = sprintf( __( 'In the future, GravityView will require Gravity Forms Version %s or newer.', 'gk-gravityview' ), GV_FUTURE_MIN_GF_VERSION );
				$version    = GV_FUTURE_MIN_GF_VERSION;
			} else {
				/* translators: the placeholder is the required version of Gravity Forms. */
				$messages[] = sprintf( __( 'GravityView requires Gravity Forms Version %s or newer.', 'gk-gravityview' ), GV_MIN_GF_VERSION );
				$version    = GV_MIN_GF_VERSION;
			}

			/* translators: the placeholder is the current version of Gravity Forms. */
			$messages[] = sprintf( esc_html__( "You're using Version %s. Please update your Gravity Forms or purchase a license.", 'gk-gravityview' ), '<strong>' . GFCommon::$version . '</strong>' );

			/* translators: In this context, "get" means purchase */
			$messages[] = '<a href="https://www.gravitykit.com/gravityforms/">' . esc_html__( 'Get the latest Gravity Forms.', 'gk-gravityview' ) . '</a>';

			// Show the notice even if the future version requirements aren't met.
			self::$notices['gf_version'] = [
				'namespace'    => 'gk-gravityview',
				'slug'         => 'gf_version_' . $version,
				'message'      => join( ' ', $messages ),
				'severity'     => $meets_minimum ? 'warning' : 'error',
				'capabilities' => [ 'update_plugins' ],
				'dismissible'  => false,
				'screens'      => [ [ __CLASS__, 'should_show_notice' ] ],
				'context'      => 'all',
			];

			// Return false if the plugin is not compatible, true if meets minimum.
			return $meets_minimum;
		}

		$gf_status = self::get_plugin_status( 'gravityforms/gravityforms.php' );

		/**
		 * The plugin is activated and yet somehow GFCommon didn't get picked up...
		 * OR
		 * It's the Network Admin and we just don't know whether the sites have GF activated themselves.
		 */
		if ( true === $gf_status || is_network_admin() ) {
			return true;
		}

		// If GFCommon doesn't exist, assume GF not active.
		$return = false;

		switch ( $gf_status ) {
			case 'inactive':
				// Required for multisite.
				if ( ! function_exists( 'wp_create_nonce' ) ) {
					require_once ABSPATH . WPINC . '/pluggable.php';
				}

				// Otherwise, throws an error on activation & deactivation "Use of undefined constant LOGGED_IN_COOKIE".
				if ( is_multisite() ) {
					wp_cookie_constants();
				}

				$return = false;

				$button = function_exists( 'is_network_admin' ) && is_network_admin() ? '<strong><a href="#gravity-forms">' : '<strong><a href="' . wp_nonce_url( admin_url( 'plugins.php?action=activate&plugin=gravityforms/gravityforms.php' ), 'activate-plugin_gravityforms/gravityforms.php' ) . '">';

				self::$notices['gf_inactive'] = [
					'namespace'    => 'gk-gravityview',
					'slug'         => 'gf_inactive',
					'message'      => sprintf( __( '%1$sGravityView requires Gravity Forms to be active. %2$sActivate Gravity Forms%3$s to use the GravityView plugin.', 'gk-gravityview' ), '', $button, '</a></strong>' ),
					'severity'     => 'error',
					'capabilities' => [ 'activate_plugins' ],
					'dismissible'  => false,
					'screens'      => [ [ __CLASS__, 'should_show_notice' ] ],
					'context'      => 'all',
				];

				break;
			default:
				self::$notices['gf_installed'] = [
					'namespace'    => 'gk-gravityview',
					'slug'         => 'gf_installed',
					'message'      => sprintf( __( '%1$sGravityView requires Gravity Forms to be installed in order to run properly. %2$sGet Gravity Forms%3$s - starting at $59%4$s%5$s', 'gk-gravityview' ), '', '<a href="https://www.gravitykit.com/gravityforms/">', '', '', '</a>' ),
					'severity'     => 'error',
					'capabilities' => [ 'install_plugins' ],
					'dismissible'  => false,
					'screens'      => [ [ __CLASS__, 'should_show_notice' ] ],
					'context'      => 'all',
				];

				break;
		}

		return $return;
	}

	/**
	 * Check for potential conflicts and let users know about common issues.
	 *
	 * @return void
	 */
	private static function check_gf_directory() {
		if ( ! class_exists( 'GFDirectory' ) ) {
			return;
		}

		self::$notices['gf_directory'] = [
			'namespace'    => 'gk-gravityview',
			'slug'         => 'gf_directory',
			'message'      => __( 'GravityView and Gravity Forms Directory are both active. This may cause problems. If you experience issues, disable the Gravity Forms Directory plugin.', 'gk-gravityview' ),
			'severity'     => 'warning',
			'capabilities' => [ 'activate_plugins' ],
			'dismissible'  => true,
			'screens'      => [ [ __CLASS__, 'should_show_notice' ] ],
			'context'      => 'all',
		];
	}

	/**
	 * Checks if specified plugin is active, inactive or not installed.
	 *
	 * @param string $location (default: '')
	 *
	 * @return boolean|string True: plugin is active; False: plugin file doesn't exist at path; 'inactive' it's inactive.
	 */
	public static function get_plugin_status( $location = '' ) {
		if ( ! function_exists( 'is_plugin_active' ) ) {
			include_once ABSPATH . 'wp-admin/includes/plugin.php';
		}

		if ( is_network_admin() && is_plugin_active_for_network( $location ) ) {
			return true;
		}

		if ( ! is_network_admin() && is_plugin_active( $location ) ) {
			return true;
		}

		if (
			! file_exists( trailingslashit( WP_PLUGIN_DIR ) . $location ) &&
			! file_exists( trailingslashit( WPMU_PLUGIN_DIR ) . $location )
		) {
			return false;
		}

		return 'inactive';
	}

	/**
	 * Displays a notice on the All Views or New View page when the compatibility requirements for the plugin are not met.
	 *
	 * @since 2.19.7
	 *
	 * @return void
	 */
	public static function override_post_pages_when_compatibility_fails() {
		global $pagenow;

		if ( ! in_array( $pagenow, [ 'post.php', 'edit.php', 'post-new.php' ], true ) ) {
			return;
		}

		$display_notices = function ( $hook_data ) {
			global $post;

			if ( ! $post instanceof WP_Post || 'gravityview' !== $post->post_type ) {
				return $hook_data;
			}

			// We only care about GravityView notices :)
			remove_all_actions( 'admin_notices' );
			remove_all_actions( 'network_admin_notices' );

			new GravityView_Admin_Notices();

			// Hide the "Screen Options" tab.
			add_filter( 'screen_options_show_screen', '__return_false' );

			// Render the wrapper for the page, which will include the notices.
			require_once ABSPATH . 'wp-admin/admin-header.php';
			require_once ABSPATH . 'wp-admin/admin-footer.php';

			exit;
		};

		add_filter( 'bulk_post_updated_messages', $display_notices ); // Fired on All Views page.

		/**
		 * Fired on New View and Edit View pages.
		 * Without this in place, other notices, the Post Title, and the Publish metabox will continue to be displayed.
		 */
		add_filter( 'replace_editor', $display_notices );
	}

	/**
	 * Determines if the compatibility notice should be shown on the current admin screen.
	 * This limits the display of the notice to the Dashboard, Plugins and GravityView post type screens.
	 *
	 * @internal
	 *
	 * @since 2.45
	 *
	 * @return bool
	 */
	public static function should_show_notice() {
		global $post;

		$screen_obj = function_exists( 'get_current_screen' ) ? get_current_screen() : null;
		$current_id = $screen_obj ? $screen_obj->id : null;

		if ( in_array( $current_id, [ 'dashboard', 'plugins', 'dashboard-network', 'plugins-network' ], true ) ) {
			return true;
		}

		if ( $post instanceof WP_Post && 'gravityview' === $post->post_type ) {
			return true;
		}

		return false;
	}
}

GravityView_Compatibility::getInstance();
