<?php
/**
 * Export and erasure of a logged-in shopper's try-ons.
 *
 * @package Fitzaro
 */

namespace Fitzaro\Privacy;

use Fitzaro\Job\Requests;
use Fitzaro\Storage\FileStore;

defined( 'ABSPATH' ) || exit;

/**
 * Only requests started while logged in can be tied to an e-mail address. Guest requests carry
 * hashes only and are removed by the retention job.
 *
 * Photos are not included in an export: they are deleted within a day, and the export lists what
 * is still held about the person (product, status, date).
 */
final class PersonalData {

	/**
	 * Most requests handled per call; more than a shopper makes in the retention period.
	 */
	public const LIMIT = 500;

	/**
	 * Export items, newest first.
	 *
	 * @param Requests $requests     Request storage.
	 * @param int      $user_id      User ID.
	 * @param callable $product_name Receives a product ID, returns its name.
	 * @return list<array{id: string, data: array{product: string, status: string, date: string}}>
	 */
	public static function export( Requests $requests, int $user_id, callable $product_name ): array {
		$items = array();

		foreach ( $requests->for_user( $user_id, self::LIMIT ) as $row ) {
			$items[] = array(
				'id'   => 'fitzaro-tryon-' . (string) $row['id'],
				'data' => array(
					'product' => (string) $product_name( (int) $row['product_id'] ),
					'status'  => (string) $row['status'],
					'date'    => (string) $row['created_at'],
				),
			);
		}

		return $items;
	}

	/**
	 * Deletes the user's requests and their photos. Returns the number of requests removed.
	 *
	 * @param Requests  $requests Request storage.
	 * @param FileStore $files    Private files.
	 * @param int       $user_id  User ID.
	 */
	public static function erase( Requests $requests, FileStore $files, int $user_id ): int {
		$removed = 0;

		foreach ( $requests->for_user( $user_id, self::LIMIT ) as $row ) {
			$files->delete( (string) ( $row['upload_path'] ?? '' ) );
			$files->delete( (string) ( $row['result_path'] ?? '' ) );

			if ( $requests->delete( (string) $row['id'] ) ) {
				++$removed;
			}
		}

		return $removed;
	}
}