<?php
/**
 * Customer designs in WordPress's privacy tools (Tools › Export / Erase Personal Data), the privacy-policy
 * guide, and designs deleted when their order is deleted for good.
 *
 * A design belongs to the shopper who made it (their user ID when signed in) and, once ordered, to that
 * order. Erasing removes the designs that are not part of an order; ordered designs follow WooCommerce's own
 * "Remove personal data from orders on request" setting, like the orders themselves.
 *
 * @package PrintBlob
 */

namespace PrintBlob;

defined( 'ABSPATH' ) || exit;

final class Privacy {

	private const ID       = 'printblob-designs';
	private const PER_PAGE = 50;

	public static function register(): void {
		add_filter( 'wp_privacy_personal_data_exporters', array( __CLASS__, 'add_exporter' ) );
		add_filter( 'wp_privacy_personal_data_erasers', array( __CLASS__, 'add_eraser' ) );
		add_action( 'admin_init', array( __CLASS__, 'policy_text' ) );
		add_action( 'woocommerce_before_delete_order', array( __CLASS__, 'delete_order_designs' ) );
		add_action( 'before_delete_post', array( __CLASS__, 'delete_order_designs_legacy' ) );
	}

	public static function add_exporter( array $exporters ): array {
		$exporters[ self::ID ] = array(
			'exporter_friendly_name' => __( 'PrintBlob designs', 'printblob' ),
			'callback'               => array( __CLASS__, 'export' ),
		);
		return $exporters;
	}

	public static function add_eraser( array $erasers ): array {
		$erasers[ self::ID ] = array(
			'eraser_friendly_name' => __( 'PrintBlob designs', 'printblob' ),
			'callback'             => array( __CLASS__, 'erase' ),
		);
		return $erasers;
	}

	/** The designs of the person with this email: theirs as a signed-in shopper, and those on their orders. */
	private static function designs_of( string $email, int $page ): array {
		$user   = get_user_by( 'email', $email );
		$orders = wc_get_orders(
			array(
				'billing_email' => $email,
				'limit'         => -1,
				'return'        => 'ids',
			)
		);
		if ( $user ) {
			$orders = array_merge(
				$orders,
				wc_get_orders(
					array(
						'customer_id' => $user->ID,
						'limit'       => -1,
						'return'      => 'ids',
					)
				)
			);
		}
		$meta = array( 'relation' => 'OR' );
		if ( $user ) {
			$meta[] = array(
				'key'   => Design_Store::META_OWNER,
				'value' => (string) $user->ID,
			);
		}
		if ( $orders ) {
			$meta[] = array(
				'key'     => Design_Store::META_ORDER,
				'value'   => array_map( 'intval', array_unique( $orders ) ),
				'compare' => 'IN',
			);
		}
		if ( count( $meta ) < 2 ) {
			return array();
		}
		return get_posts(
			array(
				'post_type'   => Design_Store::POST_TYPE,
				'post_status' => 'private',
				'numberposts' => self::PER_PAGE,
				'paged'       => $page,
				'meta_query'  => $meta, // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_query
			)
		);
	}

	public static function export( string $email, int $page = 1 ): array {
		$data = array();
		foreach ( self::designs_of( $email, $page ) as $design ) {
			$product = Design_Store::product_of( $design->ID );
			$order   = Design_Store::order_id( $design->ID );
			$items   = array(
				array(
					'name'  => __( 'Product', 'printblob' ),
					'value' => $product ? $product->get_name() : '',
				),
				array(
					'name'  => __( 'Created', 'printblob' ),
					'value' => $design->post_date_gmt . ' UTC',
				),
				array(
					'name'  => __( 'Order', 'printblob' ),
					'value' => $order ? (string) $order : __( 'Not ordered', 'printblob' ),
				),
			);
			foreach ( Design_Store::sides( $design->ID ) as $side => $files ) {
				$url = ! empty( $files['preview_id'] ) ? wp_get_attachment_url( (int) $files['preview_id'] ) : '';
				if ( $url ) {
					$items[] = array(
						/* translators: %s: printed side, e.g. Front. */
						'name'  => sprintf( __( 'Preview, %s', 'printblob' ), Product_Settings::side_label( $side ) ),
						'value' => $url,
					);
				}
				foreach ( (array) ( $files['uploads'] ?? array() ) as $upload ) {
					$items[] = array(
						/* translators: %s: printed side, e.g. Front. */
						'name'  => sprintf( __( 'Uploaded image, %s', 'printblob' ), Product_Settings::side_label( $side ) ),
						'value' => wp_basename( (string) $upload ),
					);
				}
			}
			$data[] = array(
				'group_id'    => self::ID,
				'group_label' => __( 'Designs', 'printblob' ),
				'item_id'     => 'printblob-design-' . $design->ID,
				'data'        => $items,
			);
		}
		return array(
			'data' => $data,
			'done' => count( $data ) < self::PER_PAGE,
		);
	}

	public static function erase( string $email ): array {
		$orders_too = 'yes' === get_option( 'woocommerce_erasure_request_removes_order_data', 'no' );
		$removed    = false;
		$retained   = false;
		// Always page 1: what is deleted no longer shows up, and what is kept is counted only once below.
		foreach ( self::designs_of( $email, 1 ) as $design ) {
			$ordered = Design_Store::order_id( $design->ID ) > 0;
			if ( $ordered && ! $orders_too ) {
				$retained = true;
				continue;
			}
			Design_Store::delete_design( $design->ID );
			$removed = true;
		}
		return array(
			'items_removed'  => $removed,
			'items_retained' => $retained,
			'messages'       => $retained ? array( __( 'Designs that are part of an order were kept with the order (WooCommerce › Settings › Accounts & Privacy decides whether order data is removed on request).', 'printblob' ) ) : array(),
			'done'           => true,
		);
	}

	public static function policy_text(): void {
		if ( ! function_exists( 'wp_add_privacy_policy_content' ) ) {
			return;
		}
		wp_add_privacy_policy_content(
			'PrintBlob',
			'<p>' . esc_html__( 'When you design a product, the images you upload and the text you add are stored on this site with your design: a preview of each printed side, and a print file that only the shop’s staff can download. Designs that are not ordered are deleted after a few days; designs that are ordered are kept with the order. Nothing is sent to PrintBlob or any other service.', 'printblob' ) . '</p>'
		);
	}

	/** An order deleted for good takes its designs, previews and print files with it. */
	public static function delete_order_designs( $order_id ): void {
		foreach ( get_posts(
			array(
				'post_type'   => Design_Store::POST_TYPE,
				'post_status' => 'private',
				'numberposts' => -1,
				'fields'      => 'ids',
				'meta_key'    => Design_Store::META_ORDER, // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_key -- One order's designs, by the order they are saved with.
				'meta_value'  => (int) $order_id, // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_value -- As above.
			)
		) as $design_id ) {
			Design_Store::delete_design( (int) $design_id );
		}
	}

	/** The same for orders stored as posts (WooCommerce without High-Performance Order Storage). */
	public static function delete_order_designs_legacy( $post_id ): void {
		if ( 'shop_order' === get_post_type( $post_id ) ) {
			self::delete_order_designs( (int) $post_id );
		}
	}
}