<?php
/**
 * Import assistant from Custom Product Tabs (YIKES): analysis, preview, import in batches, report.
 * The screen has no menu entry: it opens from the settings, the empty library and the notice.
 *
 * @package Prodtabs
 */

namespace Prodtabs;

defined( 'ABSPATH' ) || exit;

/**
 * Import screen, AJAX actions and notice.
 */
final class Admin_Import {

	const PAGE   = 'prodtabs-import';
	const NONCE  = 'prodtabs_import';
	const NOTICE = 'prodtabs_yikes_notice_dismissed';

	/** Hooks. */
	public static function init(): void {
		add_action( 'admin_menu', array( __CLASS__, 'menu' ) );
		add_filter( 'parent_file', array( __CLASS__, 'parent_file' ), 99 );
		add_filter( 'submenu_file', array( __CLASS__, 'submenu_file' ), 99 );
		add_action( 'admin_enqueue_scripts', array( __CLASS__, 'assets' ) );
		add_action( 'wp_ajax_prodtabs_import_start', array( __CLASS__, 'ajax_start' ) );
		add_action( 'wp_ajax_prodtabs_import_step', array( __CLASS__, 'ajax_step' ) );
		add_action( 'admin_post_prodtabs_deactivate_yikes', array( __CLASS__, 'deactivate_yikes' ) );
		add_action( 'admin_post_prodtabs_undo_import', array( __CLASS__, 'undo_import' ) );
		add_action( 'admin_post_prodtabs_stop_import', array( __CLASS__, 'stop_import' ) );
		add_action( 'admin_notices', array( __CLASS__, 'notice' ) );
		add_action( 'admin_init', array( __CLASS__, 'dismiss_notice' ) );
	}

	/** Address of the import screen. */
	public static function url( array $args = array() ): string {
		return add_query_arg( $args, admin_url( 'admin.php?page=' . self::PAGE ) );
	}

	/**
	 * Screen registered under Products, its menu entry removed once the access check is done: the screen opens from
	 * the settings, the library and the notice, and the Products menu stays highlighted.
	 */
	public static function menu(): void {
		add_submenu_page(
			'edit.php?post_type=product',
			__( 'Import from Custom Product Tabs (YIKES)', 'prodtabs' ),
			__( 'Import tabs', 'prodtabs' ),
			'manage_woocommerce',
			self::PAGE,
			array( __CLASS__, 'render' )
		);
		add_action(
			'admin_head',
			static function () {
				remove_submenu_page( 'edit.php?post_type=product', self::PAGE );
			}
		);
	}

	/** Whether the current screen is the import screen. */
	private static function is_screen(): bool {
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- screen detection only.
		return isset( $_GET['page'] ) && self::PAGE === $_GET['page'];
	}

	/**
	 * Menu open on the import screen: Prodtabs, or Products without the Prodtabs menu.
	 *
	 * @param string $file Parent file.
	 */
	public static function parent_file( $file ) {
		return self::is_screen() ? Admin_Hub::parent_slug() : $file;
	}

	/**
	 * Tabs entry highlighted on the import screen.
	 *
	 * @param string $file Submenu file.
	 */
	public static function submenu_file( $file ) {
		return self::is_screen() ? 'edit.php?post_type=' . Library::POST_TYPE : $file;
	}

	/** Script and styles of the screen. */
	public static function assets(): void {
		if ( ! self::is_screen() ) {
			return;
		}
		wp_enqueue_style( 'prodtabs-admin', PRODTABS_URL . 'assets/css/admin.css', array(), Plugin::asset_version( 'assets/css/admin.css' ) );
		wp_enqueue_script( 'prodtabs-admin-import', PRODTABS_URL . 'assets/js/admin-import.js', array( 'jquery', 'wp-a11y' ), Plugin::asset_version( 'assets/js/admin-import.js' ), true );
		wp_localize_script(
			'prodtabs-admin-import',
			'prodtabsImport',
			array(
				'ajaxUrl'   => admin_url( 'admin-ajax.php' ),
				'nonce'     => wp_create_nonce( self::NONCE ),
				'reportUrl' => self::url( array( 'step' => 'report' ) ),
				'i18n'      => array(
					'startError' => __( 'The import could not start. Reload the page and try again.', 'prodtabs' ),
					'error'      => __( 'The import stopped. Reload the page: it will resume where it stopped.', 'prodtabs' ),
					'done'       => __( 'Import finished.', 'prodtabs' ),
					'none'       => __( 'Select at least one product, or choose to import all the products.', 'prodtabs' ),
				),
			)
		);
	}

	/* Screen --------------------------------------------------------------------------------------------------- */

	/** Screen content. */
	public static function render(): void {
		if ( ! current_user_can( 'manage_woocommerce' ) ) {
			wp_die( esc_html__( 'Sorry, you are not allowed to import tabs.', 'prodtabs' ) );
		}
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- navigation between read-only steps.
		$step  = isset( $_GET['step'] ) ? sanitize_key( wp_unslash( $_GET['step'] ) ) : 'analysis';
		$state = Import_Yikes::state();
		if ( 'running' === ( $state['status'] ?? '' ) && 'run' !== $step ) {
			$step = 'resume';
		}
		$steps = array(
			'analysis' => __( 'Analysis', 'prodtabs' ),
			'preview'  => __( 'Preview', 'prodtabs' ),
			'run'      => _x( 'Import', 'noun', 'prodtabs' ),
			'report'   => __( 'Report', 'prodtabs' ),
		);
		$current = 'resume' === $step ? 'run' : $step;
		?>
		<div class="wrap prodtabs-import">
			<h1><?php esc_html_e( 'Import from Custom Product Tabs (YIKES)', 'prodtabs' ); ?></h1>
			<ol class="prodtabs-steps">
				<?php foreach ( $steps as $key => $label ) : ?>
					<li<?php echo $key === $current ? ' aria-current="step" class="is-current"' : ''; ?>><?php echo esc_html( $label ); ?></li>
				<?php endforeach; ?>
			</ol>
			<?php
			switch ( $step ) {
				case 'preview':
					self::step_preview();
					break;
				case 'run':
				case 'resume':
					self::step_run( $state, 'resume' === $step );
					break;
				case 'report':
					self::step_report( $state );
					break;
				default:
					self::step_analysis();
			}
			?>
		</div>
		<?php
	}

	/** Step 1: what was found and what needs attention. */
	private static function step_analysis(): void {
		self::undo_message();
		$a = Import_Yikes::analyze();
		if ( ! $a['products'] && ! $a['saved'] ) {
			echo '<p>' . esc_html__( 'No tabs of Custom Product Tabs (YIKES) were found on this site: there is nothing to import.', 'prodtabs' ) . '</p>';
			echo '<p><a class="button" href="' . esc_url( admin_url( 'edit.php?post_type=' . Library::POST_TYPE ) ) . '">' . esc_html__( 'Go to the shared tabs', 'prodtabs' ) . '</a></p>';
			return;
		}
		$warnings = self::warnings( $a );
		?>
		<h2><?php esc_html_e( 'What was found', 'prodtabs' ); ?></h2>
		<ul class="prodtabs-status">
			<li>
				<?php
				/* translators: %d: number of products. */
				echo esc_html( sprintf( _n( '%d product has tabs of Custom Product Tabs (YIKES).', '%d products have tabs of Custom Product Tabs (YIKES).', $a['products'], 'prodtabs' ), $a['products'] ) );
				echo ' ';
				/* translators: %d: number of tabs. */
				echo esc_html( sprintf( _n( '%d tab in all.', '%d tabs in all.', $a['tabs'], 'prodtabs' ), $a['tabs'] ) );
				?>
			</li>
			<li>
				<?php
				/* translators: %d: number of saved tabs. */
				echo esc_html( sprintf( _n( '%d saved tab: it becomes a shared tab.', '%d saved tabs: they become shared tabs.', $a['saved'], 'prodtabs' ), $a['saved'] ) );
				echo ' ';
				/* translators: %d: number of products tabs that come from saved tabs. */
				echo esc_html( sprintf( _n( 'They appear %d time on products.', 'They appear %d times on products.', $a['linked'], 'prodtabs' ), $a['linked'] ) );
				?>
			</li>
			<?php if ( $a['languages'] ) : ?>
				<li>
					<?php
					$parts = array();
					foreach ( $a['languages'] as $lang => $count ) {
						/* translators: 1: language code, 2: number of products. */
						$parts[] = sprintf( __( '%1$s: %2$d', 'prodtabs' ), $lang, $count );
					}
					/* translators: %l: list of languages with their number of products, joined by wp_sprintf(). */
					echo esc_html( wp_sprintf( __( 'Products by language: %l.', 'prodtabs' ), $parts ) );
					echo ' ';
					esc_html_e( 'A product and its translations share one list of tabs; each language keeps its own texts.', 'prodtabs' );
					?>
				</li>
			<?php endif; ?>
			<li>
				<?php
				echo esc_html(
					$a['active']
						? __( 'Custom Product Tabs (YIKES) is active. It can stay active during the import: its tabs are hidden on the products once imported, so nothing shows twice.', 'prodtabs' )
						: __( 'Custom Product Tabs (YIKES) is not active: its data is read from the database.', 'prodtabs' )
				);
				?>
			</li>
		</ul>

		<h2><?php esc_html_e( 'Points to check', 'prodtabs' ); ?></h2>
		<?php if ( $warnings ) : ?>
			<ul class="prodtabs-status">
				<?php foreach ( $warnings as $warning ) : ?>
					<li><span class="dashicons dashicons-warning" aria-hidden="true"></span> <?php echo esc_html( $warning ); ?></li>
				<?php endforeach; ?>
			</ul>
		<?php else : ?>
			<p><?php esc_html_e( 'Nothing special: every tab can be imported as it is.', 'prodtabs' ); ?></p>
		<?php endif; ?>

		<p class="prodtabs-box__actions">
			<a class="button button-primary" href="<?php echo esc_url( self::url( array( 'step' => 'preview' ) ) ); ?>"><?php esc_html_e( 'See the preview', 'prodtabs' ); ?></a>
		</p>
		<p class="description"><?php esc_html_e( 'The data of Custom Product Tabs (YIKES) is only read: nothing is changed or deleted, and the import can be run again.', 'prodtabs' ); ?></p>
		<?php
	}

	/** Message after an undo. */
	private static function undo_message(): void {
		// phpcs:disable WordPress.Security.NonceVerification.Recommended -- message after a redirect.
		if ( ! isset( $_GET['undone'] ) ) {
			return;
		}
		$cleaned  = isset( $_GET['cleaned'] ) ? absint( $_GET['cleaned'] ) : 0;
		$restored = isset( $_GET['restored'] ) ? absint( $_GET['restored'] ) : 0;
		$kept     = isset( $_GET['kept'] ) ? absint( $_GET['kept'] ) : 0;
		// phpcs:enable
		$lines = array(
			/* translators: %d: number of products. */
			sprintf( _n( 'Import undone on %d product.', 'Import undone on %d products.', $cleaned, 'prodtabs' ), $cleaned ),
		);
		if ( $restored ) {
			/* translators: %d: number of products. */
			$lines[] = sprintf( _n( '%d product got back the ProdTabs tabs it had before the import.', '%d products got back the ProdTabs tabs they had before the import.', $restored, 'prodtabs' ), $restored );
		}
		if ( $kept ) {
			/* translators: %d: number of library tabs. */
			$lines[] = sprintf( _n( '%d shared tab created by the import is used by other products since: it was kept.', '%d shared tabs created by the import are used by other products since: they were kept.', $kept, 'prodtabs' ), $kept );
		}
		echo '<div class="notice notice-success inline"><p>' . esc_html( implode( ' ', $lines ) ) . '</p></div>';
	}

	/**
	 * Warnings of the analysis, as sentences.
	 *
	 * @param array $a Analysis.
	 * @return string[]
	 */
	private static function warnings( array $a ): array {
		$out = array();
		if ( $a['has_tabs'] ) {
			/* translators: %d: number of products. */
			$out[] = sprintf( _n( '%d product already has ProdTabs tabs made by hand: it is skipped, with its translations, unless you choose to import it again (its tabs are then kept aside and put back if you undo the import).', '%d products already have ProdTabs tabs made by hand: they are skipped, with their translations, unless you choose to import them again (their tabs are then kept aside and put back if you undo the import).', $a['has_tabs'], 'prodtabs' ), $a['has_tabs'] );
		}
		if ( $a['duplicate'] ) {
			/* translators: %d: number of tabs. */
			$out[] = sprintf( _n( '%d tab was never shown by YIKES because another tab of the product has the same title: it is imported hidden, so that you can check it and show it.', '%d tabs were never shown by YIKES because another tab of the product has the same title: they are imported hidden, so that you can check them and show them.', $a['duplicate'], 'prodtabs' ), $a['duplicate'] );
		}
		if ( $a['untitled'] ) {
			/* translators: %d: number of tabs. */
			$out[] = sprintf( _n( '%d tab has no title, so YIKES never showed it: it is imported hidden.', '%d tabs have no title, so YIKES never showed them: they are imported hidden.', $a['untitled'], 'prodtabs' ), $a['untitled'] );
		}
		if ( $a['replaces_native'] ) {
			/* translators: %d: number of tabs. */
			$out[] = sprintf( _n( '%d tab has the title of a WooCommerce tab (Description, Reviews) and replaced it: it is imported, and the WooCommerce tab is hidden on that product.', '%d tabs have the title of a WooCommerce tab (Description, Reviews) and replaced it: they are imported, and the WooCommerce tab is hidden on those products.', $a['replaces_native'], 'prodtabs' ), $a['replaces_native'] );
		}
		if ( $a['differs'] ) {
			/* translators: %d: number of tabs. */
			$out[] = sprintf( _n( '%d tab is linked to a saved tab but its text differs: it is imported as a customized copy of the shared tab.', '%d tabs are linked to a saved tab but their text differs: they are imported as customized copies of the shared tab.', $a['differs'], 'prodtabs' ), $a['differs'] );
		}
		if ( $a['looks_saved'] ) {
			/* translators: %d: number of tabs. */
			$out[] = sprintf( _n( '%d tab has the same text as a saved tab without being linked to it: it is imported as a customized copy, with a button to go back to the shared version.', '%d tabs have the same text as a saved tab without being linked to it: they are imported as customized copies, with a button to go back to the shared version.', $a['looks_saved'], 'prodtabs' ), $a['looks_saved'] );
		}
		if ( $a['unreadable'] ) {
			/* translators: %s: product ids. */
			$out[] = sprintf( __( 'Tabs that cannot be read (damaged data), products %s: they are left out.', 'prodtabs' ), implode( ', ', array_slice( $a['unreadable'], 0, 20 ) ) );
		}
		if ( $a['repaired'] ) {
			/* translators: %d: number of products. */
			$out[] = sprintf( _n( '%d product has tabs edited outside WordPress (spreadsheet): they were repaired for the import, check them.', '%d products have tabs edited outside WordPress (spreadsheet): they were repaired for the import, check them.', count( $a['repaired'] ), 'prodtabs' ), count( $a['repaired'] ) );
		}
		if ( $a['shortcodes'] ) {
			/* translators: %s: shortcode names. */
			$out[] = sprintf( __( 'Shortcodes of plugins that are not active: %s. They will show as plain text until their plugin is active.', 'prodtabs' ), '[' . implode( '], [', array_keys( $a['shortcodes'] ) ) . ']' );
		}
		if ( $a['groups'] && $a['groups'] < $a['products'] ) {
			/* translators: %d: number of groups. */
			$out[] = sprintf( _n( 'Products and their translations are imported together (%d group): one list of tabs for all their languages, with the texts of each language matched by position.', 'Products and their translations are imported together (%d groups): one list of tabs for all their languages, with the texts of each language matched by position.', $a['groups'], 'prodtabs' ), $a['groups'] );
		}
		if ( $a['missing_translation'] ) {
			/* translators: %d: number of tabs. */
			$out[] = sprintf( _n( '%d tab of a translation had no equivalent with YIKES: that language shows the text of the default language until you translate it.', '%d tabs of translations had no equivalent with YIKES: those languages show the text of the default language until you translate them.', $a['missing_translation'], 'prodtabs' ), $a['missing_translation'] );
		}
		if ( $a['not_in_source'] ) {
			/* translators: %d: number of tabs. */
			$out[] = sprintf( _n( '%d tab of a translation does not exist in the default language: it is added to the list and shown only in the languages that have it.', '%d tabs of translations do not exist in the default language: they are added to the list and shown only in the languages that have them.', $a['not_in_source'], 'prodtabs' ), $a['not_in_source'] );
		}
		if ( $a['pro'] ) {
			/* translators: %d: number of saved tabs. */
			$out[] = sprintf( _n( '%d saved tab was a global or category tab of YIKES Pro: it is imported as a shared tab, to be added to products.', '%d saved tabs were global or category tabs of YIKES Pro: they are imported as shared tabs, to be added to products.', $a['pro'], 'prodtabs' ), $a['pro'] );
		}
		if ( $a['imported'] ) {
			/* translators: %d: number of products. */
			$out[] = sprintf( _n( '%d product was already imported: it is skipped, unless you choose to import it again.', '%d products were already imported: they are skipped, unless you choose to import them again.', $a['imported'], 'prodtabs' ), $a['imported'] );
		}
		return $out;
	}

	/**
	 * "3 products", "1 saved tab"…
	 *
	 * @param string $what  products or saved.
	 * @param int    $count Number.
	 */
	private static function count_label( string $what, int $count ): string {
		switch ( $what ) {
			case 'products':
				/* translators: %d: number of products. */
				return sprintf( _n( '%d product', '%d products', $count, 'prodtabs' ), $count );
			default:
				/* translators: %d: number of saved tabs. */
				return sprintf( _n( '%d saved tab', '%d saved tabs', $count, 'prodtabs' ), $count );
		}
	}

	/** Step 2: products and the tabs they will get, options, start. */
	private static function step_preview(): void {
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- read-only pagination.
		$page     = isset( $_GET['paged'] ) ? max( 1, absint( $_GET['paged'] ) ) : 1;
		$per_page = 20;
		$preview  = Import_Yikes::preview( $page, $per_page );
		$pages    = (int) ceil( $preview['total'] / $per_page );
		?>
		<form id="prodtabs-import-form">
			<fieldset class="prodtabs-import__scope">
				<legend class="screen-reader-text"><?php esc_html_e( 'Products to import', 'prodtabs' ); ?></legend>
				<label><input type="radio" name="scope" value="all" checked> <?php echo esc_html( sprintf( /* translators: %d: number of products. */ __( 'All the products (%d)', 'prodtabs' ), $preview['total'] ) ); ?></label><br>
				<label><input type="radio" name="scope" value="selected"> <?php esc_html_e( 'Only the products checked below', 'prodtabs' ); ?></label>
			</fieldset>
			<?php if ( $preview['first_run'] ) : // A later run keeps the settings the merchant may have changed since. ?>
				<p>
					<label><input type="checkbox" name="the_content" value="1"<?php checked( $preview['the_content'] ); ?>> <?php esc_html_e( 'Format the content as YIKES did, with the full content filter of the theme and plugins', 'prodtabs' ); ?></label>
				</p>
			<?php endif; ?>
			<?php if ( $preview['protected'] ) : ?>
				<p><label><input type="checkbox" name="overwrite" value="1"> <?php esc_html_e( 'Import again the products that already have ProdTabs tabs (their tabs are replaced, and put back if you undo the import)', 'prodtabs' ); ?></label></p>
			<?php endif; ?>

			<table class="widefat striped">
				<thead>
					<tr>
						<td class="check-column"><label class="screen-reader-text" for="prodtabs-check-all"><?php esc_html_e( 'Select all', 'prodtabs' ); ?></label><input type="checkbox" id="prodtabs-check-all"></td>
						<th scope="col"><?php esc_html_e( 'Product', 'prodtabs' ); ?></th>
						<th scope="col"><?php esc_html_e( 'Tabs after the import', 'prodtabs' ); ?></th>
					</tr>
				</thead>
				<tbody>
					<?php foreach ( $preview['rows'] as $row ) : ?>
						<tr>
							<th scope="row" class="check-column"><input type="checkbox" name="products[]" value="<?php echo esc_attr( (string) $row['id'] ); ?>" aria-label="<?php echo esc_attr( $row['title'] ); ?>"></th>
							<td>
								<a href="<?php echo esc_url( (string) get_edit_post_link( $row['id'] ) ); ?>"><?php echo esc_html( $row['title'] ); ?></a>
								<?php if ( '' !== $row['language'] ) : ?>
									<span class="prodtabs-badge"><?php echo esc_html( $row['language'] ); ?></span>
								<?php endif; ?>
								<?php if ( $row['imported'] ) : ?>
									<br><span class="description"><?php esc_html_e( 'Already imported', 'prodtabs' ); ?></span>
								<?php elseif ( $row['has_tabs'] ) : ?>
									<br><span class="description"><?php esc_html_e( 'Already has ProdTabs tabs', 'prodtabs' ); ?></span>
								<?php endif; ?>
								<?php if ( 'unreadable' === $row['status'] ) : ?>
									<br><span class="prodtabs-warning"><?php esc_html_e( 'Tabs cannot be read: left out', 'prodtabs' ); ?></span>
								<?php endif; ?>
							</td>
							<td><?php self::preview_tabs( $row['entries'], $preview['saved'] ); ?></td>
						</tr>
					<?php endforeach; ?>
				</tbody>
			</table>
			<?php if ( $pages > 1 ) : ?>
				<p class="prodtabs-pages">
					<?php
					echo wp_kses_post(
						(string) paginate_links(
							array(
								'base'      => add_query_arg( 'paged', '%#%', self::url( array( 'step' => 'preview' ) ) ),
								'format'    => '',
								'current'   => $page,
								'total'     => $pages,
								'prev_text' => __( 'Previous', 'prodtabs' ),
								'next_text' => __( 'Next', 'prodtabs' ),
							)
						)
					);
					?>
				</p>
			<?php endif; ?>
			<p class="prodtabs-box__actions">
				<button type="submit" class="button button-primary"><?php esc_html_e( 'Import', 'prodtabs' ); ?></button>
				<a class="button" href="<?php echo esc_url( self::url() ); ?>"><?php esc_html_e( 'Back to the analysis', 'prodtabs' ); ?></a>
			</p>
		</form>
		<div class="prodtabs-run" hidden>
			<?php self::progress( 0, $preview['total'] ); ?>
			<?php self::stop_form(); ?>
		</div>
		<?php
	}

	/**
	 * Tabs of a product in the preview.
	 *
	 * @param array[] $entries Entries planned.
	 * @param array   $saved   Saved tabs.
	 */
	private static function preview_tabs( array $entries, array $saved ): void {
		$titles = array();
		foreach ( $saved as $id => $tab ) {
			$titles[ $id ] = $tab['title'];
		}
		$natives = array(
			'description'            => __( 'Description', 'prodtabs' ),
			'additional_information' => __( 'Additional information', 'prodtabs' ),
			'reviews'                => __( 'Reviews', 'prodtabs' ),
		);
		$hidden = array();
		echo '<ol class="prodtabs-preview-tabs">';
		foreach ( $entries as $entry ) {
			if ( 'native' === $entry['type'] ) {
				if ( false === $entry['visible'] ) {
					$hidden[] = $natives[ $entry['key'] ];
				}
				continue;
			}
			if ( 'local' === $entry['type'] && '' === $entry['title'] && '' === trim( $entry['content'] ) ) {
				$label = 'fallback' === ( $entry['note'] ?? '' )
					? __( '(not translated: shown in the default language)', 'prodtabs' )
					: __( '(tab of another language: not shown in this one)', 'prodtabs' );
				echo '<li class="description">' . esc_html( $label ) . '</li>';
				continue;
			}
			$label = 'library' === $entry['type'] ? ( $titles[ $entry['library_id'] ] ?? '' ) : $entry['title'];
			echo '<li>' . esc_html( '' !== $label ? $label : __( '(no title)', 'prodtabs' ) ) . ' ';
			if ( 'library' === $entry['type'] ) {
				echo '<span class="prodtabs-badge prodtabs-badge--library">' . esc_html__( 'Shared', 'prodtabs' ) . '</span>';
			} elseif ( $entry['origin'] ) {
				echo '<span class="prodtabs-badge prodtabs-badge--local">' . esc_html__( 'Customized', 'prodtabs' ) . '</span>';
			}
			if ( ! $entry['visible'] ) {
				echo ' <span class="prodtabs-warning">' . esc_html__( 'hidden', 'prodtabs' ) . '</span>';
			}
			echo '</li>';
		}
		echo '</ol>';
		foreach ( $hidden as $label ) {
			/* translators: %s: name of a WooCommerce tab. */
			echo '<p class="description">' . esc_html( sprintf( __( 'WooCommerce tab “%s” hidden on this product.', 'prodtabs' ), $label ) ) . '</p>';
		}
	}

	/**
	 * Progress bar.
	 *
	 * @param int $done  Products done.
	 * @param int $total Products to do.
	 */
	private static function progress( int $done, int $total ): void {
		$percent = $total ? (int) floor( 100 * $done / $total ) : 0;
		?>
		<div class="prodtabs-progress" role="progressbar" tabindex="-1" aria-valuemin="0" aria-valuemax="100" aria-valuenow="<?php echo esc_attr( (string) $percent ); ?>" aria-label="<?php esc_attr_e( 'Import progress', 'prodtabs' ); ?>">
			<div class="prodtabs-progress__bar" style="width: <?php echo esc_attr( (string) $percent ); ?>%"></div>
		</div>
		<p class="prodtabs-progress__text" aria-live="polite">
			<?php
			/* translators: 1: products done, 2: total number of products. */
			echo esc_html( sprintf( _n( '%1$d of %2$d product', '%1$d of %2$d products', $total, 'prodtabs' ), $done, $total ) );
			?>
		</p>
		<?php
	}

	/**
	 * Step 3: import running, or stopped and ready to resume.
	 *
	 * @param array $state  Import state.
	 * @param bool  $resume Whether the page was closed during the import.
	 */
	private static function step_run( array $state, bool $resume ): void {
		if ( 'running' !== ( $state['status'] ?? '' ) ) {
			self::step_report( $state );
			return;
		}
		?>
		<div class="prodtabs-run" data-running="1">
			<?php if ( $resume ) : ?>
				<p><?php esc_html_e( 'An import was stopped before the end. It resumes where it stopped.', 'prodtabs' ); ?></p>
			<?php endif; ?>
			<?php self::progress( (int) $state['done'], (int) $state['total'] ); ?>
			<?php self::stop_form(); ?>
		</div>
		<?php
	}

	/** Button that stops the import; the script lets the running batch finish first. */
	private static function stop_form(): void {
		?>
		<form method="post" action="<?php echo esc_url( admin_url( 'admin-post.php' ) ); ?>" class="prodtabs-stop">
			<input type="hidden" name="action" value="prodtabs_stop_import">
			<?php wp_nonce_field( 'prodtabs_stop_import' ); ?>
			<p><button type="submit" class="button"><?php esc_html_e( 'Stop the import', 'prodtabs' ); ?></button></p>
			<p class="description"><?php esc_html_e( 'The products already imported keep their tabs; the report lists them.', 'prodtabs' ); ?></p>
		</form>
		<?php
	}

	/** Stops a running import from its screen. */
	public static function stop_import(): void {
		check_admin_referer( 'prodtabs_stop_import' );
		if ( ! current_user_can( 'manage_woocommerce' ) ) {
			wp_die( esc_html__( 'Sorry, you are not allowed to import tabs.', 'prodtabs' ) );
		}
		Import_Yikes::stop();
		wp_safe_redirect( self::url( array( 'step' => 'report' ) ) );
		exit;
	}

	/**
	 * Step 4: report.
	 *
	 * @param array $state Import state.
	 */
	private static function step_report( array $state ): void {
		if ( 'done' !== ( $state['status'] ?? '' ) ) {
			echo '<p>' . esc_html__( 'No import has been run yet.', 'prodtabs' ) . '</p>';
			echo '<p><a class="button button-primary" href="' . esc_url( self::url() ) . '">' . esc_html__( 'Start with the analysis', 'prodtabs' ) . '</a></p>';
			return;
		}
		$c = $state['counts'];
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- message after a redirect.
		if ( isset( $_GET['deactivated'] ) ) {
			echo '<div class="notice notice-success inline"><p>' . esc_html__( 'Custom Product Tabs (YIKES) is deactivated. Its data stays in the database: do not delete the plugin until you have checked your products, deleting it erases its data.', 'prodtabs' ) . '</p></div>';
		}
		?>
		<h2><?php echo empty( $state['stopped'] ) ? esc_html__( 'Import finished', 'prodtabs' ) : esc_html__( 'Import stopped', 'prodtabs' ); ?></h2>
		<ul class="prodtabs-status">
			<li><span class="dashicons dashicons-yes-alt" aria-hidden="true"></span>
				<?php
				/* translators: %d: number of products. */
				echo esc_html( sprintf( _n( '%d product imported.', '%d products imported.', (int) $c['imported'], 'prodtabs' ), (int) $c['imported'] ) );
				echo ' ';
				/* translators: %d: number of tabs. */
				echo esc_html( sprintf( _n( '%d tab in all.', '%d tabs in all.', (int) $c['tabs'], 'prodtabs' ), (int) $c['tabs'] ) );
				?>
			</li>
			<li><span class="dashicons dashicons-yes-alt" aria-hidden="true"></span>
				<?php
				/* translators: %d: number of library tabs. */
				echo esc_html( sprintf( _n( '%d shared tab created.', '%d shared tabs created.', (int) $c['library'], 'prodtabs' ), (int) $c['library'] ) );
				echo ' ';
				/* translators: %d: number of tabs. */
				echo esc_html( sprintf( _n( '%d product tab now uses a shared tab.', '%d product tabs now use a shared tab.', (int) $c['linked'], 'prodtabs' ), (int) $c['linked'] ) );
				?>
			</li>
			<?php if ( $c['hidden'] ) : ?>
				<li><span class="dashicons dashicons-warning" aria-hidden="true"></span>
					<?php
					/* translators: %d: number of tabs. */
					echo esc_html( sprintf( _n( '%d tab imported hidden (YIKES did not show it).', '%d tabs imported hidden (YIKES did not show them).', (int) $c['hidden'], 'prodtabs' ), (int) $c['hidden'] ) );
					?>
				</li>
			<?php endif; ?>
			<?php if ( $c['skipped'] ) : ?>
				<li>
					<?php
					/* translators: %d: number of products. */
					echo esc_html( sprintf( _n( '%d product skipped: it already had ProdTabs tabs.', '%d products skipped: they already had ProdTabs tabs.', (int) $c['skipped'], 'prodtabs' ), (int) $c['skipped'] ) );
					?>
				</li>
			<?php endif; ?>
			<?php if ( $c['errors'] ) : ?>
				<li><span class="dashicons dashicons-warning" aria-hidden="true"></span>
					<?php
					/* translators: %d: number of products. */
					echo esc_html( sprintf( _n( '%d product could not be imported:', '%d products could not be imported:', (int) $c['errors'], 'prodtabs' ), (int) $c['errors'] ) );
					?>
				</li>
			<?php endif; ?>
		</ul>
		<?php if ( ! empty( $state['errors'] ) ) : ?>
			<ul class="ul-disc">
				<?php foreach ( $state['errors'] as $error ) : ?>
					<li>
						<?php if ( $error[0] ) : ?>
							<a href="<?php echo esc_url( (string) get_edit_post_link( (int) $error[0] ) ); ?>"><?php echo esc_html( get_the_title( (int) $error[0] ) ); ?></a>:
						<?php endif; ?>
						<?php echo esc_html( $error[1] ); ?>
					</li>
				<?php endforeach; ?>
			</ul>
		<?php endif; ?>
		<?php self::report_notes( $state['notes'] ?? array() ); ?>

		<?php if ( ! empty( $state['first'] ) ) : ?>
			<p>
				<?php esc_html_e( 'Check a product:', 'prodtabs' ); ?>
				<a href="<?php echo esc_url( (string) get_permalink( (int) $state['first'] ) ); ?>" target="_blank" rel="noopener"><?php echo esc_html( get_the_title( (int) $state['first'] ) ); ?><span class="screen-reader-text"> <?php esc_html_e( '(opens in a new tab)', 'prodtabs' ); ?></span></a>
				(<a href="<?php echo esc_url( (string) get_edit_post_link( (int) $state['first'] ) ); ?>"><?php esc_html_e( 'edit', 'prodtabs' ); ?></a>)
			</p>
		<?php endif; ?>

		<?php if ( Import_Yikes::active() && self::yikes_network_active() ) : ?>
			<h2><?php esc_html_e( 'And now?', 'prodtabs' ); ?></h2>
			<p><?php esc_html_e( 'Custom Product Tabs (YIKES) is active on the whole network: only the network admin can deactivate it, from the Plugins screen of the network, once the other sites no longer use it.', 'prodtabs' ); ?></p>
		<?php elseif ( Import_Yikes::active() && current_user_can( 'deactivate_plugin', Import_Yikes::PLUGIN_FILE ) ) : ?>
			<h2><?php esc_html_e( 'And now?', 'prodtabs' ); ?></h2>
			<p><?php esc_html_e( 'Your products now show the ProdTabs tabs. Custom Product Tabs (YIKES) can be deactivated: its data stays in the database, and the import can be run again.', 'prodtabs' ); ?></p>
			<form method="post" action="<?php echo esc_url( admin_url( 'admin-post.php' ) ); ?>" class="prodtabs-box__actions">
				<input type="hidden" name="action" value="prodtabs_deactivate_yikes">
				<?php wp_nonce_field( 'prodtabs_deactivate_yikes' ); ?>
				<button type="submit" class="button button-primary"><?php esc_html_e( 'Deactivate YIKES', 'prodtabs' ); ?></button>
				<a class="button" href="<?php echo esc_url( admin_url( 'edit.php?post_type=' . Library::POST_TYPE ) ); ?>"><?php esc_html_e( 'Keep YIKES for now', 'prodtabs' ); ?></a>
			</form>
		<?php endif; ?>
		<p class="description"><?php esc_html_e( 'The data of Custom Product Tabs (YIKES) was not changed. Do not delete that plugin before checking your products: deleting it erases its data.', 'prodtabs' ); ?></p>
		<p><a href="<?php echo esc_url( self::url() ); ?>"><?php esc_html_e( 'Run the import again', 'prodtabs' ); ?></a></p>

		<?php $in_use = Import_Yikes::library_in_use(); ?>
		<h2><?php esc_html_e( 'Not what you expected?', 'prodtabs' ); ?></h2>
		<form method="post" action="<?php echo esc_url( admin_url( 'admin-post.php' ) ); ?>" class="prodtabs-undo" data-confirm="<?php esc_attr_e( 'Undo the import? The imported products get back the ProdTabs tabs they had before it, and changes made to them since are lost.', 'prodtabs' ); ?>">
			<input type="hidden" name="action" value="prodtabs_undo_import">
			<?php wp_nonce_field( 'prodtabs_undo_import' ); ?>
			<p><?php esc_html_e( 'Undoing the import gives the imported products back the ProdTabs tabs they had before it (usually none), and moves the shared tabs created by the import to the trash. Your products show the tabs of Custom Product Tabs (YIKES) again as long as that plugin is active.', 'prodtabs' ); ?></p>
			<?php if ( $in_use ) : ?>
				<p>
					<?php
					/* translators: %d: number of library tabs. */
					echo esc_html( sprintf( _n( '%d shared tab created by the import is now used by other products too: it will be kept.', '%d shared tabs created by the import are now used by other products too: they will be kept.', $in_use, 'prodtabs' ), $in_use ) );
					?>
				</p>
			<?php endif; ?>
			<p><button type="submit" class="button"><?php esc_html_e( 'Undo the import', 'prodtabs' ); ?></button></p>
		</form>
		<?php
	}

	/** Undoes the import from the report. */
	public static function undo_import(): void {
		check_admin_referer( 'prodtabs_undo_import' );
		if ( ! current_user_can( 'manage_woocommerce' ) ) {
			wp_die( esc_html__( 'Sorry, you are not allowed to import tabs.', 'prodtabs' ) );
		}
		$undone = Import_Yikes::undo();
		wp_safe_redirect(
			self::url(
				array(
					'undone'   => 1,
					'cleaned'  => $undone['products'],
					'restored' => $undone['restored'],
					'kept'     => $undone['kept'],
				)
			)
		);
		exit;
	}

	/**
	 * Tabs to look at after the import, by kind.
	 *
	 * @param array $notes Notes: product id, code, tab title.
	 */
	private static function report_notes( array $notes ): void {
		if ( ! $notes ) {
			return;
		}
		$labels = array(
			'duplicate'           => __( 'Imported hidden: same title as another tab of the product', 'prodtabs' ),
			'untitled'            => __( 'Imported hidden: no title', 'prodtabs' ),
			'replaces_native'     => __( 'Replaces a WooCommerce tab, which is hidden', 'prodtabs' ),
			'differs'             => __( 'Customized copy of a shared tab (its text differed)', 'prodtabs' ),
			'looks_saved'         => __( 'Customized copy of a shared tab (same text, not linked)', 'prodtabs' ),
			'repaired'            => __( 'Tabs repaired (edited outside WordPress)', 'prodtabs' ),
			'not_in_source'       => __( 'Tab missing from the default language: shown only in the languages that have it', 'prodtabs' ),
			'missing_translation' => __( 'Not translated yet: shown in the default language', 'prodtabs' ),
			'has_tabs'            => __( 'Skipped: the product already had ProdTabs tabs', 'prodtabs' ),
		);
		$by_code = array();
		foreach ( $notes as $note ) {
			$by_code[ $note[1] ][] = $note;
		}
		echo '<h2>' . esc_html__( 'Tabs to look at', 'prodtabs' ) . '</h2>';
		foreach ( $by_code as $code => $items ) {
			echo '<h3>' . esc_html( $labels[ $code ] ?? $code ) . '</h3><ul class="ul-disc">';
			foreach ( array_slice( $items, 0, 20 ) as $item ) {
				printf(
					'<li><a href="%s">%s</a>%s</li>',
					esc_url( (string) get_edit_post_link( (int) $item[0] ) ),
					esc_html( get_the_title( (int) $item[0] ) ),
					'' !== $item[2] ? ': ' . esc_html( $item[2] ) : ''
				);
			}
			if ( count( $items ) > 20 ) {
				/* translators: %d: number of other tabs. */
				echo '<li>' . esc_html( sprintf( __( 'and %d more', 'prodtabs' ), count( $items ) - 20 ) ) . '</li>';
			}
			echo '</ul>';
		}
	}

	/* AJAX ----------------------------------------------------------------------------------------------------- */

	/** Checks an AJAX request of the screen. */
	private static function check(): void {
		check_ajax_referer( self::NONCE, 'nonce' );
		if ( ! current_user_can( 'manage_woocommerce' ) ) {
			wp_send_json_error( null, 403 );
		}
	}

	/** AJAX: starts the import. */
	public static function ajax_start(): void {
		self::check();
		// phpcs:disable WordPress.Security.NonceVerification.Missing -- nonce checked by check() above.
		$scope    = isset( $_POST['scope'] ) ? sanitize_key( wp_unslash( $_POST['scope'] ) ) : 'all';
		$products = isset( $_POST['products'] ) && is_array( $_POST['products'] ) ? array_map( 'absint', wp_unslash( $_POST['products'] ) ) : array();
		if ( 'selected' === $scope && ! $products ) {
			wp_send_json_error( null, 400 );
		}
		$state = Import_Yikes::start(
			array(
				'products'    => 'selected' === $scope ? $products : array(),
				'overwrite'   => ! empty( $_POST['overwrite'] ),
				'the_content' => isset( $_POST['the_content'] ) ? ! empty( $_POST['the_content'] ) : null,
			)
		);
		// phpcs:enable
		wp_send_json_success( self::summary( $state ) );
	}

	/** AJAX: imports the next batch. */
	public static function ajax_step(): void {
		self::check();
		wp_send_json_success( self::summary( Import_Yikes::step() ) );
	}

	/**
	 * Progress sent to the script.
	 *
	 * @param array $state Import state.
	 */
	private static function summary( array $state ): array {
		$done  = (int) ( $state['done'] ?? 0 );
		$total = (int) ( $state['total'] ?? 0 );
		return array(
			'status' => $state['status'] ?? '',
			'done'   => $done,
			'total'  => $total,
			/* translators: 1: products done, 2: total number of products. */
			'text'   => sprintf( _n( '%1$d of %2$d product', '%1$d of %2$d products', $total, 'prodtabs' ), $done, $total ),
		);
	}

	/** Deactivates YIKES from the report. */
	public static function deactivate_yikes(): void {
		check_admin_referer( 'prodtabs_deactivate_yikes' );
		if ( ! current_user_can( 'deactivate_plugin', Import_Yikes::PLUGIN_FILE ) ) {
			wp_die( esc_html__( 'Sorry, you are not allowed to deactivate plugins.', 'prodtabs' ) );
		}
		// As on the Plugins screen of a site: a plugin active on the whole network is deactivated from the network.
		if ( self::yikes_network_active() ) {
			wp_die( esc_html__( 'Custom Product Tabs (YIKES) is active on the whole network: only the network admin can deactivate it, from the Plugins screen of the network, once the other sites no longer use it.', 'prodtabs' ) );
		}
		deactivate_plugins( Import_Yikes::PLUGIN_FILE, false, false );
		wp_safe_redirect( self::url( array( 'step' => 'report', 'deactivated' => 1 ) ) );
		exit;
	}

	/** Whether YIKES is active on the whole network of sites. */
	private static function yikes_network_active(): bool {
		return is_multisite() && is_plugin_active_for_network( Import_Yikes::PLUGIN_FILE );
	}

	/* Notice --------------------------------------------------------------------------------------------------- */

	/** Notice on the Plugins screen and the plugin's screens while YIKES data waits to be imported. */
	public static function notice(): void {
		$screen = get_current_screen();
		$ours   = array( 'plugins', 'edit-' . Library::POST_TYPE, 'woocommerce_page_wc-settings' );
		if ( ! $screen || ! in_array( $screen->id, $ours, true ) || self::is_screen() || ! current_user_can( 'manage_woocommerce' ) ) {
			return;
		}
		if ( 'woocommerce_page_wc-settings' === $screen->id && ! self::is_settings_section() ) {
			return;
		}
		if ( get_user_meta( get_current_user_id(), self::NOTICE, true ) || Import_Yikes::state() ) {
			return;
		}
		$found = Import_Yikes::detect();
		if ( ! $found['products'] && ! $found['reusable'] ) {
			return;
		}
		$dismiss = wp_nonce_url( add_query_arg( 'prodtabs_dismiss', 'yikes' ), 'prodtabs_dismiss_yikes' );
		?>
		<div class="notice notice-info">
			<p>
				<?php
				echo esc_html(
					sprintf(
						/* translators: 1: number of products, 2: number of saved tabs. */
						__( 'Custom Product Tabs (YIKES) found: %1$s with tabs and %2$s. Import them into ProdTabs in a few clicks; the data of YIKES is not changed.', 'prodtabs' ),
						self::count_label( 'products', $found['products'] ),
						self::count_label( 'saved', $found['reusable'] )
					)
				);
				?>
			</p>
			<p>
				<a class="button button-primary" href="<?php echo esc_url( self::url() ); ?>"><?php esc_html_e( 'Import the tabs', 'prodtabs' ); ?></a>
				<a class="button-link" href="<?php echo esc_url( $dismiss ); ?>"><?php esc_html_e( 'Do not show again', 'prodtabs' ); ?></a>
			</p>
		</div>
		<?php
	}

	/** Whether the settings screen shows the Prodtabs section. */
	private static function is_settings_section(): bool {
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- screen detection only.
		return isset( $_GET['tab'], $_GET['section'] ) && 'products' === $_GET['tab'] && Admin_Settings::SECTION === $_GET['section'];
	}

	/** Closes the notice for the current user. */
	public static function dismiss_notice(): void {
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- nonce checked below.
		if ( ! isset( $_GET['prodtabs_dismiss'] ) || 'yikes' !== $_GET['prodtabs_dismiss'] ) {
			return;
		}
		check_admin_referer( 'prodtabs_dismiss_yikes' );
		update_user_meta( get_current_user_id(), self::NOTICE, 1 );
		wp_safe_redirect( remove_query_arg( array( 'prodtabs_dismiss', '_wpnonce' ) ) );
		exit;
	}
}