<?php
/**
 * Bounded new Wizard inputs. Existing saved configuration is never migrated.
 *
 * @package Leanmerce\CommerceCompliance
 */

namespace Leanmerce\CommerceCompliance\Application\Setup;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

final class SetupInputSchema {
	/** Max UTF-8 bytes of a new value; textarea fields keep legitimate line breaks. */
	private const FIELDS = array(
		1 => array(
			'admin_language'               => 2,
			'default_document_language'    => 2,
			'enabled_customer_languages'   => 'list',
			'initialize_language_defaults' => 'bool',
		),
		2 => array(
			'legal_name'             => 512,
			'registered_name'        => 512,
			'registration_number'    => 64,
			'registration_authority' => 512,
			'tax_id'                 => 64,
			'vat_registered'         => 'bool',
			'vat_number'             => 64,
			'address'                => 2048,
			'city'                   => 256,
			'postcode'               => 32,
			'phone'                  => 64,
			'email'                  => 254,
			'site'                   => 2048,
			'establishment'          => 4,
		),
		3 => array(
			'distance_sale_registration_confirmed' => 'bool',
			'physical_goods_scope_confirmed'       => 'bool',
			'complaints_email'                     => 254,
			'complaints_phone'                     => 64,
			'complaints_contact'                   => 8192,
			'returns_same_as_complaints'           => 'bool',
			'returns_email'                        => 254,
			'returns_phone'                        => 64,
			'returns_address'                      => 2048,
			'returns_contact'                      => 8192,
			'returns_use_merchant_address'         => 'bool',
			'returns_recipient'                    => 512,
			'returns_street'                       => 2048,
			'returns_postcode'                     => 32,
			'returns_city'                         => 256,
			'returns_country'                      => 256,
			'offer_validity_configured'            => 'bool',
			'warranty_information_configured'      => 'bool',
			'sells_across_bih'                     => 'bool',
			'supplier_relationship'                => 32,
			'separate_supplier_name'               => 512,
			'separate_supplier_email'              => 254,
		),
		4 => array(
			'terms_page_id'                       => 'id',
			'contract_formation_mode'             => 32,
			'contract_formation_status'           => 64,
			'contract_formation_provider'         => 128,
			'order_process_information_confirmed' => 'bool',
			'terms_accessible_saveable_confirmed' => 'bool',
			'rs_payment_obligation_confirmed'     => 'bool',
		),
		5 => array(
			'completed_means_dispatched'             => 'bool',
			'customer_email_id'                      => 128,
			'payment_delivery_information_confirmed' => 'bool',
		),
		6 => array(
			'basic_pdf_enabled'  => 'bool',
			'basic_pdf_email_id' => 128,
		),
	);

	public static function boolean( $value ): bool {
		return in_array( $value, array( true, 1, '1', 'on', 'true', 'yes' ), true );
	}

	/** Select known fields before unslashing; unknown subtrees are never traversed. */
	public static function normalize( $input, int $step, array $settings = array() ): array {
		if ( ! is_array( $input ) || empty( $input ) || count( $input ) > 64 || ! isset( self::FIELDS[ $step ] ) ) {
			throw new \InvalidArgumentException( 'Invalid setup payload.' );
		}
		$old    = array();
		$result = array();
		foreach ( array( 'languages', 'merchant', 'sales', 'terms', 'delivery', 'documents' ) as $bucket ) {
			$old = array_replace( $old, (array) ( $settings[ $bucket ] ?? array() ) );
		}
		foreach ( self::FIELDS[ $step ] as $key => $bound ) {
			if ( ! array_key_exists( $key, $input ) ) {
				continue;
			}
			$value = $input[ $key ];
			if ( 'list' === $bound ) {
				if ( ! is_array( $value ) || count( $value ) > 4 || ! array_is_list( $value ) ) {
					throw new \InvalidArgumentException( 'Invalid language list.' );
				}
				foreach ( $value as $code ) {
					if ( ! is_string( $code ) || ! in_array( $code, LanguageCatalog::supported_codes(), true ) ) {
						throw new \InvalidArgumentException( 'Invalid language.' );
					}
				}
				$result[ $key ] = array_values( array_unique( $value ) );
				continue;
			}
			if ( 'bool' === $bound ) {
				if ( ! in_array( $value, array( true, false, 1, 0, '1', '0', 'on', 'off', 'true', 'false', 'yes', 'no', '' ), true ) ) {
					throw new \InvalidArgumentException( 'Invalid checkbox value.' );
				}
				$result[ $key ] = self::boolean( $value );
				continue;
			}
			if ( ! is_string( $value ) || false !== strpos( $value, "\0" ) || 1 !== preg_match( '//u', $value ) ) {
				throw new \InvalidArgumentException( 'Invalid scalar value.' );
			}
			$value = wp_unslash( $value );
			$enums = array(
				'admin_language'            => LanguageCatalog::supported_codes(),
				'default_document_language' => LanguageCatalog::supported_codes(),
				'establishment'             => array( '', 'FBIH', 'RS', 'BD' ),
				'supplier_relationship'     => array( '', 'SAME_AS_MERCHANT', 'SEPARATE_CONTRACT_SUPPLIER' ),
				'contract_formation_mode'   => array( '', 'ORDER_CREATED', 'PAYMENT_COMPLETED', 'ORDER_STATUS', 'CUSTOM_PROVIDER' ),
			);
			if ( isset( $enums[ $key ] ) && ! in_array( $value, $enums[ $key ], true ) ) {
				throw new \InvalidArgumentException( 'Invalid setup enum.' );
			}
			if ( 'id' === $bound ) {
				if ( '' !== $value && null === \Leanmerce\CommerceCompliance\Infrastructure\WordPress\RequestGuard::positive_id( $value ) ) {
					throw new \InvalidArgumentException( 'Invalid page ID.' );
				}
			} elseif ( strlen( $value ) > $bound && ( $old[ $key ] ?? null ) !== $value ) {
				throw new \InvalidArgumentException( 'Setup input exceeds its byte limit.' );
			}
			$result[ $key ] = $value;
		}
		if ( empty( $result ) ) {
			throw new \InvalidArgumentException( 'No known setup fields.' );
		}
		return $result;
	}

	private function __construct() {}
}