<?php
/**
 * Displays a migration notice.
 *
 * @package   Block_Lab
 * @copyright Copyright(c) 2020, Block Lab
 * @license   http://opensource.org/licenses/GPL-2.0 GNU General Public License, version 2 (GPL-2.0)
 */

namespace Block_Lab\Admin\Migration;

use Block_Lab\Component_Abstract;

/**
 * Class Notice
 */
class Notice extends Component_Abstract {

	/**
	 * The AJAX action to dismiss the migration notice.
	 *
	 * @var string
	 */
	const NOTICE_AJAX_ACTION = 'bl_dismiss_migration_notice';

	/**
	 * The action of the migration notice nonce.
	 *
	 * @var string
	 */
	const NOTICE_NONCE_ACTION = 'bl-migration-nonce';

	/**
	 * The name of the migration notice nonce.
	 *
	 * @var string
	 */
	const NOTICE_NONCE_NAME = 'bl-migration-nonce-name';

	/**
	 * The slug of the stylesheet for the migration notice.
	 *
	 * @var string
	 */
	const NOTICE_STYLE_SLUG = 'block-lab-migration-notice-style';

	/**
	 * The slug of the script for the migration notice.
	 *
	 * @var string
	 */
	const NOTICE_SCRIPT_SLUG = 'block-lab-migration-notice-script';

	/**
	 * The user meta key to store whether a user has dismissed the migration notice.
	 *
	 * @var string
	 */
	const NOTICE_USER_META_KEY = 'block_lab_show_migration_notice';

	/**
	 * The user meta value stored if a user has dismissed the migration notice.
	 *
	 * @var string
	 */
	const NOTICE_DISMISSED_META_VALUE = 'dismissed';

	/**
	 * The capability required to see the notice.
	 *
	 * @var string
	 */
	const NOTICE_CAPABILITY = 'install_plugins';

	/**
	 * Adds an action for the notice.
	 */
	public function register_hooks() {
		add_action( 'admin_enqueue_scripts', [ $this, 'enqueue_assets' ] );
		add_action( 'wp_ajax_' . self::NOTICE_AJAX_ACTION, [ $this, 'ajax_handler_migration_notice' ] );
	}

	/**
	 * Outputs the migration notice if this is on the right page and the user has the right permission.
	 */
	public function render_migration_notice() {
		if ( ! $this->should_display_migration_notice() ) {
			return;
		}

		// @todo: verify that this doc page exists, or change it to one that does exist.
		$learn_more_link = 'https://getblocklab.com/docs/genesis-custom-blocks';
		$migration_url   = add_query_arg(
			[
				'post_type' => block_lab()->get_post_type_slug(),
				'page'      => 'block-lab-migration',
			],
			admin_url( 'edit.php' )
		);

		?>
		<div id="bl-migration-notice" class="notice notice-info bl-notice-migration">
			<?php wp_nonce_field( self::NOTICE_NONCE_ACTION, self::NOTICE_NONCE_NAME, false ); ?>
			<div class="bl-migration-copy">
				<p>
					<?php
					printf(
						/* translators: %1$s: the plugin name */
						esc_html__( 'The Block Lab team have moved. For future updates and improvements, migrate now to the new home of custom blocks: %1$s.', 'block-lab' ),
						sprintf(
							'<strong>%1$s</strong>',
							esc_html__( 'Genesis Custom Blocks', 'block-lab' )
						)
					);
					?>
					<a target="_blank" rel="noopener noreferrer" class="bl-notice-migration__learn-more" href="<?php echo esc_url( $learn_more_link ); ?>">
						<?php esc_html_e( 'Learn more', 'block-lab' ); ?>
					</a>
				</p>
			</div>
			<button id="bl-notice-not-now" href="#" class="bl-notice-option button button-secondary">
				<?php esc_html_e( 'Not Now', 'block-lab' ); ?>
			</button>
			<a href="<?php echo esc_url( $migration_url ); ?>" class="bl-notice-option button button-primary">
				<?php esc_html_e( 'Migrate', 'block-lab' ); ?>
			</a>
		</div>
		<div id="bl-not-now-notice" class="notice notice-info bl-notice-migration bl-hidden">
			<div class="bl-migration-copy">
				<p><?php esc_html_e( "When you're ready, our migration tool is available in the main menu, under Block Lab > Migrate.", 'block-lab' ); ?></p>
			</div>
			<a href="#" id="bl-notice-ok" class="bl-notice-option">
				<?php esc_html_e( 'Okay', 'block-lab' ); ?>
			</a>
		</div>
		<?php
	}

	/**
	 * Enqueues the migration notice assets.
	 */
	public function enqueue_assets() {
		if ( ! $this->should_display_migration_notice() ) {
			return;
		}

		wp_enqueue_style(
			self::NOTICE_STYLE_SLUG,
			$this->plugin->get_url( 'css/admin.migration-notice.css' ),
			[],
			$this->plugin->get_version()
		);

		wp_enqueue_script(
			self::NOTICE_SCRIPT_SLUG,
			$this->plugin->get_url( 'js/admin.migration-notice.js' ),
			[],
			$this->plugin->get_version(),
			true
		);
	}

	/**
	 * Gets whether the migration notice should display.
	 *
	 * This should display on Block Lab > Content Blocks,
	 * /wp-admin/plugins.php, the Dashboard, and Block Lab > Settings.
	 *
	 * @return bool Whether the migration notice should display.
	 */
	public function should_display_migration_notice() {
		if ( ! current_user_can( self::NOTICE_CAPABILITY ) ) {
			return false;
		}

		// If the user has dismissed the notice, it shouldn't appear again.
		if ( self::NOTICE_DISMISSED_META_VALUE === get_user_meta( get_current_user_id(), self::NOTICE_USER_META_KEY, true ) ) {
			return false;
		}

		$screen = get_current_screen();
		return (
			( isset( $screen->base, $screen->post_type ) && 'edit' === $screen->base && 'block_lab' === $screen->post_type )
			||
			( isset( $screen->base ) && in_array( $screen->base, [ 'plugins', 'dashboard', 'block_lab_page_block-lab-settings' ], true ) )
		);
	}

	/**
	 * Handles an AJAX request to not display the notice.
	 *
	 * This stores in the user meta the fact that the notice was dismissed,
	 * so it's not displayed again.
	 */
	public function ajax_handler_migration_notice() {
		check_ajax_referer( self::NOTICE_NONCE_ACTION, self::NOTICE_NONCE_NAME );

		if ( ! current_user_can( self::NOTICE_CAPABILITY ) ) {
			wp_send_json_error();
		}

		update_user_meta( get_current_user_id(), self::NOTICE_USER_META_KEY, self::NOTICE_DISMISSED_META_VALUE );

		wp_send_json_success();
	}
}