<?php
/**
 * Die Seite fuer die Content-Jobs.
 *
 * @package Aivor\Content
 */

namespace Aivor\Content\Admin;

use Aivor\Content\Job\Job;
use Aivor\Content\Job\JobRepository;
use Aivor\Content\Plugin;
use Aivor\Content\Settings\Settings;
use Aivor\Content\Target\PostTypeTarget;

defined( 'ABSPATH' ) || exit;

/**
 * Liste, Anlegen und Bearbeiten der Content-Jobs.
 */
final class JobsPage {

	/**
	 * Slug der Unterseite.
	 *
	 * @var string
	 */
	public const SLUG = 'aivor-content-import-jobs';

	/**
	 * Nonce-Aktion des Formulars.
	 *
	 * @var string
	 */
	private const NONCE_ACTION = 'aivor_content_save_job';

	/**
	 * Verarbeitet Speichern und Loeschen, bevor etwas ausgegeben wurde.
	 *
	 * @return void
	 */
	public static function handle_post(): void {
		if ( ! current_user_can( Plugin::CAPABILITY ) ) {
			return;
		}

		$method = isset( $_SERVER['REQUEST_METHOD'] ) ? sanitize_key( wp_unslash( $_SERVER['REQUEST_METHOD'] ) ) : '';

		if ( 'post' === $method ) {
			self::save();

			return;
		}

		// phpcs:ignore WordPress.Security.NonceVerification.Recommended
		$action = isset( $_GET['action'] ) ? sanitize_key( wp_unslash( $_GET['action'] ) ) : '';

		if ( 'delete' !== $action ) {
			return;
		}

		// phpcs:ignore WordPress.Security.NonceVerification.Recommended
		$id = isset( $_GET['job'] ) ? absint( wp_unslash( $_GET['job'] ) ) : 0;

		check_admin_referer( 'aivor_content_delete_job_' . $id );

		( new JobRepository() )->delete( $id );
		self::redirect( 'deleted' );
	}

	/**
	 * Gibt die Seite aus.
	 *
	 * @return void
	 */
	public static function render(): void {
		if ( ! current_user_can( Plugin::CAPABILITY ) ) {
			wp_die( esc_html__( 'You are not allowed to do this.', 'aivor-content-import' ) );
		}

		self::render_notice();

		// phpcs:ignore WordPress.Security.NonceVerification.Recommended
		$action = isset( $_GET['action'] ) ? sanitize_key( wp_unslash( $_GET['action'] ) ) : '';

		if ( 'edit' === $action || 'new' === $action ) {
			self::render_form( $action );

			return;
		}

		self::render_list();
	}

	/**
	 * Klartext-Beschreibung des Ziels eines Jobs.
	 *
	 * @param Job $job Der Job.
	 * @return string
	 */
	public static function describe_target( Job $job ): string {
		$post_type = get_post_type_object( $job->post_type );
		$label     = $post_type instanceof \WP_Post_Type ? $post_type->labels->singular_name : $job->post_type;

		if ( '' === $job->taxonomy || 0 === $job->term_id ) {
			return $label;
		}

		$term = get_term( $job->term_id, $job->taxonomy );

		if ( ! $term instanceof \WP_Term ) {
			return $label . ' — ' . __( '(term no longer exists)', 'aivor-content-import' );
		}

		return $label . ' — ' . $term->name;
	}

	/**
	 * Klartext-Beschreibung des Autors eines Jobs.
	 *
	 * @param Job $job Der Job.
	 * @return string
	 */
	public static function describe_author( Job $job ): string {
		if ( 0 === $job->author_id ) {
			return __( 'Default author', 'aivor-content-import' );
		}

		$user = get_userdata( $job->author_id );

		return $user instanceof \WP_User ? $user->display_name : __( '(user deleted)', 'aivor-content-import' );
	}

	/**
	 * Klartext, was nach dem Import mit einem Beitrag passiert.
	 *
	 * @param Job $job Der Job.
	 * @return string
	 */
	public static function describe_mode( Job $job ): string {
		if ( Job::MODE_PENDING === $job->mode ) {
			return __( 'Submitted for review', 'aivor-content-import' );
		}

		return __( 'Saved as draft', 'aivor-content-import' );
	}

	/**
	 * Nimmt das Formular entgegen.
	 *
	 * @return void
	 */
	private static function save(): void {
		check_admin_referer( self::NONCE_ACTION );

		$repository = new JobRepository();

		// Das Feld heisst aivor_post_type, nicht post_type: admin.php liest
		// $_REQUEST['post_type'], sucht die Seite dann unter admin.php?post_type=…,
		// findet sie nicht und bricht mit „Cannot load" ab.
		$id           = isset( $_POST['job_id'] ) ? absint( wp_unslash( $_POST['job_id'] ) ) : 0;
		$aivor_job_id = isset( $_POST['aivor_job_id'] ) ? strtolower( trim( sanitize_text_field( wp_unslash( $_POST['aivor_job_id'] ) ) ) ) : '';
		$post_type    = isset( $_POST['aivor_post_type'] ) ? sanitize_key( wp_unslash( $_POST['aivor_post_type'] ) ) : 'post';
		$author_id    = isset( $_POST['author_id'] ) ? absint( wp_unslash( $_POST['author_id'] ) ) : 0;
		$mode         = isset( $_POST['mode'] ) ? sanitize_key( wp_unslash( $_POST['mode'] ) ) : Job::MODE_DRAFT;
		$comments     = ! empty( $_POST['enable_comments'] );
		$term_field   = isset( $_POST['term'] ) ? sanitize_text_field( wp_unslash( $_POST['term'] ) ) : '';

		if ( ! self::is_uuid( $aivor_job_id ) ) {
			self::redirect( 'invalid_uuid', $id, true );
		}

		if ( ! in_array( $post_type, self::selectable_post_types(), true ) ) {
			self::redirect( 'invalid_post_type', $id, true );
		}

		$taxonomy = '';
		$term_id  = 0;

		if ( '' !== $term_field ) {
			$parts = explode( ':', $term_field, 2 );

			if ( 2 === count( $parts ) ) {
				$taxonomy = sanitize_key( $parts[0] );
				$term_id  = absint( $parts[1] );
			}

			if ( '' === $taxonomy || 0 === $term_id || ! in_array( $taxonomy, get_object_taxonomies( $post_type ), true ) ) {
				self::redirect( 'invalid_term', $id, true );
			}

			if ( ! get_term( $term_id, $taxonomy ) instanceof \WP_Term ) {
				self::redirect( 'invalid_term', $id, true );
			}
		}

		if ( ! in_array( $mode, Job::modes(), true ) ) {
			$mode = Job::MODE_DRAFT;
		}

		$existing = $id > 0 ? $repository->find( $id ) : null;
		$base     = $existing instanceof Job ? $existing : new Job();

		// Eine geaenderte Import-Job-ID gehoert womoeglich zu einer anderen
		// Site; die zwischengespeicherten Angaben des alten Jobs gelten nicht mehr.
		$same_remote = $base->aivor_job_id === $aivor_job_id;

		$job = $base->with(
			array(
				'aivor_job_id'    => $aivor_job_id,
				'post_type'       => $post_type,
				'taxonomy'        => $taxonomy,
				'term_id'         => $term_id,
				'author_id'       => $author_id,
				'mode'            => $mode,
				'enable_comments' => $comments,
				'site_hash'       => $same_remote ? $base->site_hash : '',
				'remote_name'     => $same_remote ? $base->remote_name : '',
				'remote_site_url' => $same_remote ? $base->remote_site_url : '',
				'remote_status'   => $same_remote ? $base->remote_status : '',
				'error'           => $same_remote ? $base->error : '',
			)
		);

		$job = $repository->save( $job );

		// Bei einer Aktivierung ohne angemeldeten Benutzer (WP-CLI, Installer)
		// fehlt der Standard-Autor noch; spaetestens hier ist jemand da.
		Settings::adopt_default_author( get_current_user_id() );

		if ( '' === Settings::api_key() ) {
			self::redirect( 'saved' );
		}

		$notices = array(
			'ok'        => 'saved_verified',
			'not_found' => 'saved_not_found',
			'forbidden' => 'saved_forbidden',
		);

		self::redirect( $notices[ ConnectionCheck::check_job( $job ) ] ?? 'saved_unverified' );
	}

	/**
	 * Gibt die Liste aus.
	 *
	 * @return void
	 */
	private static function render_list(): void {
		$table = new JobsListTable();
		$table->prepare_items();

		$new_url = add_query_arg(
			array(
				'page'   => self::SLUG,
				'action' => 'new',
			),
			admin_url( 'admin.php' )
		);

		?>
		<div class="wrap">
			<?php Tabs::render( self::SLUG ); ?>
			<h2 class="wp-heading-inline" style="display:inline-block;margin-right:5px"><?php esc_html_e( 'Content jobs', 'aivor-content-import' ); ?></h2>
			<a href="<?php echo esc_url( $new_url ); ?>" class="page-title-action"><?php esc_html_e( 'Add content job', 'aivor-content-import' ); ?></a>
			<p><?php esc_html_e( 'A content job connects a topic cluster or content job in Aivor with a post type and category on this website. Every cluster has its own import job ID.', 'aivor-content-import' ); ?></p>
			<?php $table->display(); ?>
		</div>
		<?php
	}

	/**
	 * Gibt das Formular aus.
	 *
	 * @param string $action edit oder new.
	 * @return void
	 */
	private static function render_form( string $action ): void {
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Nur Auswahl des angezeigten Jobs.
		$id  = isset( $_GET['job'] ) ? absint( wp_unslash( $_GET['job'] ) ) : 0;
		$job = 'edit' === $action ? ( new JobRepository() )->find( $id ) : null;

		if ( 'edit' === $action && ! $job instanceof Job ) {
			echo '<div class="wrap">';
			Tabs::render( self::SLUG );
			printf( '<p>%s</p></div>', esc_html__( 'This content job no longer exists.', 'aivor-content-import' ) );

			return;
		}

		if ( ! $job instanceof Job ) {
			$job = new Job();
		}

		$list_url = add_query_arg( array( 'page' => self::SLUG ), admin_url( 'admin.php' ) );

		?>
		<div class="wrap">
			<?php Tabs::render( self::SLUG ); ?>
			<h2><?php echo esc_html( 0 === $job->id ? __( 'Add content job', 'aivor-content-import' ) : __( 'Edit content job', 'aivor-content-import' ) ); ?></h2>

			<?php if ( '' !== $job->error ) : ?>
				<div class="notice notice-error inline"><p><?php echo esc_html( $job->error ); ?></p></div>
			<?php endif; ?>

			<form method="post" action="">
				<?php wp_nonce_field( self::NONCE_ACTION ); ?>
				<input type="hidden" name="job_id" value="<?php echo esc_attr( (string) $job->id ); ?>">

				<table class="form-table" role="presentation">
					<tbody>
						<tr>
							<th scope="row"><label for="aivor_job_id"><?php esc_html_e( 'Import job ID', 'aivor-content-import' ); ?></label></th>
							<td>
								<input type="text" id="aivor_job_id" name="aivor_job_id" class="regular-text code" value="<?php echo esc_attr( $job->aivor_job_id ); ?>" pattern="[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}" title="<?php esc_attr_e( 'A UUID, for example 3f2a1c40-9b6e-4a11-8d3c-5e7f9a0b1c2d', 'aivor-content-import' ); ?>" required spellcheck="false">
								<p class="description"><?php esc_html_e( 'In Aivor, open the cluster under Content → Clusters and copy the “Import job ID for the CMS plugin”.', 'aivor-content-import' ); ?></p>
								<?php if ( 'ok' === $job->remote_status && '' !== $job->remote_name ) : ?>
									<p><span class="dashicons dashicons-yes" aria-hidden="true"></span>
										<?php
										echo esc_html(
											sprintf(
												/* translators: %s: name of the job in Aivor */
												__( 'Found in Aivor: %s', 'aivor-content-import' ),
												$job->remote_name
											)
										);
										?>
									</p>
								<?php endif; ?>
							</td>
						</tr>
						<tr>
							<th scope="row"><label for="aivor_post_type"><?php esc_html_e( 'Post type', 'aivor-content-import' ); ?></label></th>
							<td>
								<select id="aivor_post_type" name="aivor_post_type">
									<?php foreach ( self::selectable_post_types() as $type ) : ?>
										<?php $object = get_post_type_object( $type ); ?>
										<option value="<?php echo esc_attr( $type ); ?>" <?php selected( $job->post_type, $type ); ?>>
											<?php echo esc_html( $object instanceof \WP_Post_Type ? $object->labels->singular_name : $type ); ?>
										</option>
									<?php endforeach; ?>
								</select>
								<p class="description"><?php esc_html_e( 'Posts and pages are fully supported. Other post types work in the same way but are not tested by us.', 'aivor-content-import' ); ?></p>
							</td>
						</tr>
						<tr>
							<th scope="row"><label for="term"><?php esc_html_e( 'Category', 'aivor-content-import' ); ?></label></th>
							<td>
								<select id="term" name="term">
									<option value=""><?php esc_html_e( '— none —', 'aivor-content-import' ); ?></option>
									<?php self::render_term_options( $job ); ?>
								</select>
								<p class="description"><?php esc_html_e( 'The list shows the categories and terms of the saved post type. After changing the post type, save first.', 'aivor-content-import' ); ?></p>
							</td>
						</tr>
						<tr>
							<th scope="row"><label for="author_id"><?php esc_html_e( 'Author', 'aivor-content-import' ); ?></label></th>
							<td>
								<?php
								wp_dropdown_users(
									array(
										'name'             => 'author_id',
										'id'               => 'author_id',
										'selected'         => $job->author_id,
										'include_selected' => true,
										'show_option_none' => __( '— default author —', 'aivor-content-import' ),
										'option_none_value' => 0,
										'capability'       => array( 'edit_posts' ),
									)
								);
								?>
							</td>
						</tr>
						<tr>
							<th scope="row"><?php esc_html_e( 'After import', 'aivor-content-import' ); ?></th>
							<td>
								<fieldset>
									<legend class="screen-reader-text"><?php esc_html_e( 'After import', 'aivor-content-import' ); ?></legend>
									<label>
										<input type="radio" name="mode" value="<?php echo esc_attr( Job::MODE_DRAFT ); ?>" <?php checked( $job->mode, Job::MODE_DRAFT ); ?>>
										<?php esc_html_e( 'Save as draft (recommended)', 'aivor-content-import' ); ?>
									</label><br>
									<label>
										<input type="radio" name="mode" value="<?php echo esc_attr( Job::MODE_PENDING ); ?>" <?php checked( $job->mode, Job::MODE_PENDING ); ?>>
										<?php esc_html_e( 'Submit for review (status “Pending”)', 'aivor-content-import' ); ?>
									</label>
								</fieldset>
								<p class="description"><?php esc_html_e( 'Imported articles arrive complete with featured image, category, tags and meta description. You review them and publish them with one click. Aivor learns the address of an article only once it is public, so the next articles of a cluster wait until you publish its pillar article.', 'aivor-content-import' ); ?></p>
							</td>
						</tr>
						<tr>
							<th scope="row"><?php esc_html_e( 'Comments', 'aivor-content-import' ); ?></th>
							<td>
								<label>
									<input type="checkbox" name="enable_comments" value="1" <?php checked( $job->enable_comments ); ?>>
									<?php esc_html_e( 'Allow comments on imported posts', 'aivor-content-import' ); ?>
								</label>
							</td>
						</tr>
					</tbody>
				</table>

				<?php submit_button( __( 'Save content job', 'aivor-content-import' ) ); ?>
				<a href="<?php echo esc_url( $list_url ); ?>"><?php esc_html_e( 'Cancel', 'aivor-content-import' ); ?></a>
			</form>
		</div>
		<?php
	}

	/**
	 * Warnung, wenn die in Aivor hinterlegte Website nicht zu dieser passt.
	 *
	 * Aivor nimmt die Meldung dann zwar an, fuehrt den Artikel aber nicht als
	 * Linkziel, bis die Adresse bestaetigt ist (technisches Konzept K9).
	 *
	 * @param Job $job Der Job.
	 * @return string Leer, wenn alles passt oder nichts bekannt ist.
	 */
	public static function site_mismatch_warning( Job $job ): string {
		if ( '' === $job->remote_site_url || PostTypeTarget::same_site( $job->remote_site_url, home_url() ) ) {
			return '';
		}

		return sprintf(
			/* translators: 1: website address stored in Aivor, 2: address of this website */
			__( 'In Aivor, this job belongs to the website %1$s, but this website is %2$s. Correct the website address in Aivor, otherwise the articles are not linked with each other.', 'aivor-content-import' ),
			$job->remote_site_url,
			home_url()
		);
	}

	/**
	 * Gibt die Begriffe des Ziel-Inhaltstyps aus, nach Taxonomie gruppiert.
	 *
	 * @param Job $job Der bearbeitete Job.
	 * @return void
	 */
	private static function render_term_options( Job $job ): void {
		$taxonomies = get_object_taxonomies( $job->post_type, 'objects' );

		foreach ( $taxonomies as $taxonomy ) {
			if ( ! $taxonomy->show_ui ) {
				continue;
			}

			$terms = get_terms(
				array(
					'taxonomy'   => $taxonomy->name,
					'hide_empty' => false,
					'number'     => 200,
				)
			);

			if ( is_wp_error( $terms ) || array() === $terms ) {
				continue;
			}

			printf( '<optgroup label="%s">', esc_attr( $taxonomy->labels->name ) );

			foreach ( $terms as $term ) {
				$value = $taxonomy->name . ':' . $term->term_id;

				printf(
					'<option value="%s" %s>%s</option>',
					esc_attr( $value ),
					selected( $job->taxonomy . ':' . $job->term_id, $value, false ),
					esc_html( $term->name )
				);
			}

			echo '</optgroup>';
		}
	}

	/**
	 * Die als Ziel waehlbaren Inhaltstypen.
	 *
	 * @return string[]
	 */
	private static function selectable_post_types(): array {
		$types = get_post_types(
			array(
				'public'  => true,
				'show_ui' => true,
			)
		);

		unset( $types['attachment'] );

		return array_values( $types );
	}

	/**
	 * Prueft das UUID-Format. Der Server lehnt alles andere mit 400 ab.
	 *
	 * @param string $value Zu pruefender Wert.
	 * @return bool
	 */
	private static function is_uuid( string $value ): bool {
		return 1 === preg_match( '/^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/', $value );
	}

	/**
	 * Zeigt die Rueckmeldung nach dem Absenden.
	 *
	 * @return void
	 */
	private static function render_notice(): void {
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Nur Anzeige einer Rueckmeldung.
		$notice = isset( $_GET['aivor_notice'] ) ? sanitize_key( wp_unslash( $_GET['aivor_notice'] ) ) : '';

		$messages = array(
			'saved'             => array( 'success', __( 'Content job saved.', 'aivor-content-import' ) ),
			'saved_verified'    => array( 'success', __( 'Content job saved and found in Aivor.', 'aivor-content-import' ) ),
			'saved_unverified'  => array( 'warning', __( 'Content job saved. Aivor could not be asked about it right now; the next run will show whether the import job ID is correct.', 'aivor-content-import' ) ),
			'saved_not_found'   => array( 'error', __( 'Content job saved, but Aivor does not know this import job ID. Copy it again from the cluster in Aivor.', 'aivor-content-import' ) ),
			'saved_forbidden'   => array( 'error', __( 'Content job saved, but the import job belongs to a different Aivor project than the API key. Create the API key in the project of the cluster.', 'aivor-content-import' ) ),
			'deleted'           => array( 'success', __( 'Content job deleted. Posts that were already imported stay.', 'aivor-content-import' ) ),
			'invalid_uuid'      => array( 'error', __( 'The import job ID must be a UUID. The content job was not saved.', 'aivor-content-import' ) ),
			'invalid_post_type' => array( 'error', __( 'This post type is not available. The content job was not saved.', 'aivor-content-import' ) ),
			'invalid_term'      => array( 'error', __( 'The selected category does not belong to the post type. The content job was not saved.', 'aivor-content-import' ) ),
		);

		if ( ! isset( $messages[ $notice ] ) ) {
			return;
		}

		printf(
			'<div class="notice notice-%s is-dismissible"><p>%s</p></div>',
			esc_attr( $messages[ $notice ][0] ),
			esc_html( $messages[ $notice ][1] )
		);
	}

	/**
	 * Leitet nach der Verarbeitung zurueck.
	 *
	 * @param string $notice        Schluessel der Rueckmeldung.
	 * @param int    $job_id        Job, zu dem zurueckgekehrt wird; 0 fuer die Liste.
	 * @param bool   $back_to_form  Bei $job_id 0 zurueck ins leere Formular statt in die Liste.
	 * @return void
	 */
	private static function redirect( string $notice, int $job_id = 0, bool $back_to_form = false ): void {
		$args = array(
			'page'         => self::SLUG,
			'aivor_notice' => $notice,
		);

		if ( $job_id > 0 ) {
			$args['action'] = 'edit';
			$args['job']    = $job_id;
		} elseif ( $back_to_form ) {
			// Ein neuer Job hat keine ID, zu der man zurueckkehren koennte. Ohne
			// diesen Zweig landet die Fehlermeldung auf der Liste — weit weg von
			// dem Formular, das sie erklaert.
			$args['action'] = 'new';
		}

		wp_safe_redirect( add_query_arg( $args, admin_url( 'admin.php' ) ) );
		exit;
	}
}