<?php
/**
 * Gallery storage. A gallery is a non-public post: the title is its name,
 * settings and images live in post meta.
 */

defined( 'ABSPATH' ) || exit;

class EquaFrame_Gallery {

	const POST_TYPE     = 'equaframe_gallery';
	const META_SETTINGS = '_equaframe_settings';
	const META_IMAGES   = '_equaframe_images';

	public static function register_post_type() {
		register_post_type(
			self::POST_TYPE,
			array(
				'labels'              => array(
					'name'          => __( 'Galleries', 'equaframe' ),
					'singular_name' => __( 'Gallery', 'equaframe' ),
				),
				'public'              => false,
				'show_ui'             => false,
				'show_in_menu'        => false,
				'show_in_rest'        => false,
				'exclude_from_search' => true,
				'rewrite'             => false,
				'query_var'           => false,
				'supports'            => array( 'title' ),
			)
		);
	}

	/**
	 * @return int|WP_Error New gallery ID.
	 */
	public static function create( $name, $layout ) {
		$id = wp_insert_post(
			wp_slash(
				array(
					'post_type'   => self::POST_TYPE,
					'post_status' => 'publish',
					'post_title'  => $name,
				)
			),
			true
		);
		if ( is_wp_error( $id ) ) {
			return $id;
		}
		$settings = EquaFrame_Settings::defaults();
		if ( isset( EquaFrame_Settings::layouts()[ $layout ] ) ) {
			$settings['layout'] = $layout;
		}
		update_post_meta( $id, self::META_SETTINGS, wp_slash( $settings ) );
		update_post_meta( $id, self::META_IMAGES, array() );
		return (int) $id;
	}

	public static function get( $id ) {
		$post = get_post( (int) $id );
		if ( ! $post || self::POST_TYPE !== $post->post_type || 'trash' === $post->post_status ) {
			return null;
		}
		return $post;
	}

	public static function all() {
		return get_posts(
			array(
				'post_type'      => self::POST_TYPE,
				'post_status'    => 'publish',
				'posts_per_page' => -1,
				'orderby'        => 'date',
				'order'          => 'DESC',
			)
		);
	}

	public static function get_settings( $id ) {
		return EquaFrame_Settings::with_defaults( get_post_meta( (int) $id, self::META_SETTINGS, true ) );
	}

	/**
	 * @param int    $id       Gallery ID.
	 * @param array  $input    Unslashed submitted settings.
	 * @param string $name     New gallery name (optional).
	 */
	public static function save_settings( $id, $input, $name = '' ) {
		$settings = EquaFrame_Settings::sanitize( $input, self::get_settings( $id ) );
		update_post_meta( $id, self::META_SETTINGS, wp_slash( $settings ) );
		if ( '' !== $name ) {
			wp_update_post( wp_slash( array( 'ID' => $id, 'post_title' => $name ) ) );
		}
		return $settings;
	}

	public static function get_images( $id ) {
		$images = get_post_meta( (int) $id, self::META_IMAGES, true );
		return is_array( $images ) ? array_values( $images ) : array();
	}

	/**
	 * Clean a list of images from the admin UI and keep only real image attachments.
	 *
	 * @param mixed $raw Decoded JSON (already unslashed).
	 */
	public static function sanitize_images( $raw ) {
		$images = array();
		if ( ! is_array( $raw ) ) {
			return $images;
		}
		foreach ( $raw as $row ) {
			if ( ! is_array( $row ) ) {
				continue;
			}
			// Only positive whole numbers are attachment IDs; "-6" must not turn into 6.
			$attachment_id = ( isset( $row['id'] ) && is_scalar( $row['id'] ) ) ? (int) $row['id'] : 0;
			if ( $attachment_id < 1 || ! wp_attachment_is_image( $attachment_id ) ) {
				continue;
			}
			$images[] = array(
				'id'      => $attachment_id,
				'title'   => self::clean_text( isset( $row['title'] ) ? $row['title'] : '' ),
				'alt'     => self::clean_text( isset( $row['alt'] ) ? $row['alt'] : '' ),
				'caption' => self::clean_text( isset( $row['caption'] ) ? $row['caption'] : '' ),
				'css_id'  => isset( $row['css_id'] ) ? self::sanitize_css_id( $row['css_id'] ) : '',
			);
		}
		return $images;
	}

	/**
	 * Single-line text from the admin UI, capped at a sensible length.
	 *
	 * @param mixed $value Raw value.
	 * @return string
	 */
	private static function clean_text( $value ) {
		return mb_substr( sanitize_text_field( is_scalar( $value ) ? (string) $value : '' ), 0, 1000 );
	}

	/**
	 * HTML IDs must not contain spaces and are easiest to target in CSS when they
	 * start with a letter.
	 */
	public static function sanitize_css_id( $value ) {
		$value = preg_replace( '/[^A-Za-z0-9_\-:.]/', '', (string) $value );
		if ( '' !== $value && ! preg_match( '/^[A-Za-z]/', $value ) ) {
			$value = 'id-' . $value;
		}
		return substr( $value, 0, 80 );
	}

	public static function save_images( $id, $images ) {
		update_post_meta( $id, self::META_IMAGES, wp_slash( $images ) );
		wp_update_post( array( 'ID' => $id ) ); // Touch the modified date.
	}

	public static function duplicate( $id ) {
		$post = self::get( $id );
		if ( ! $post ) {
			return 0;
		}
		/* translators: %s: gallery name */
		$title = sprintf( __( '%s (copy)', 'equaframe' ), $post->post_title );
		$new   = wp_insert_post(
			wp_slash(
				array(
					'post_type'   => self::POST_TYPE,
					'post_status' => 'publish',
					'post_title'  => $title,
				)
			)
		);
		if ( ! $new || is_wp_error( $new ) ) {
			return 0;
		}
		update_post_meta( $new, self::META_SETTINGS, wp_slash( self::get_settings( $id ) ) );
		update_post_meta( $new, self::META_IMAGES, wp_slash( self::get_images( $id ) ) );
		return (int) $new;
	}

	public static function delete( $id ) {
		return self::get( $id ) ? (bool) wp_delete_post( $id, true ) : false;
	}
}