<?php
/**
 * Native registration context factory.
 *
 * @package ZeroSpamForms
 */

namespace TwoOTwoCode\ZeroSpamForms\Integrations\WordPress\Auth;

defined( 'ABSPATH' ) || exit;

use TwoOTwoCode\ZeroSpamForms\Engine\SubmissionContext;
use TwoOTwoCode\ZeroSpamForms\Integrations\ProtectionFieldRenderer;
use TwoOTwoCode\ZeroSpamForms\Integrations\SubmissionContextFactory;

/**
 * Converts native WordPress registration data into engine context.
 */
final class RegistrationContextFactory extends SubmissionContextFactory {
	/**
	 * Default form identifier.
	 */
	public const DEFAULT_FORM_ID = 'wordpress_registration';

	/**
	 * Build context from registration and posted data.
	 *
	 * @param string               $username              Submitted username.
	 * @param string               $email                 Submitted email.
	 * @param array<string, mixed> $posted_data           Posted form data.
	 * @param string               $rate_limit_identifier Identifier used only for hashing.
	 * @param int|null             $timestamp             Current timestamp.
	 */
	public function build_from_registration_data(
		string $username,
		string $email,
		array $posted_data,
		string $rate_limit_identifier = '',
		?int $timestamp = null
	): SubmissionContext {
		return $this->build_from_submitted_data(
			$this->normalize_registration_data( $username, $email, $posted_data ),
			self::DEFAULT_FORM_ID,
			$rate_limit_identifier,
			$timestamp
		);
	}

	/**
	 * Normalize native registration fields and root protection fields.
	 *
	 * @param string               $username    Submitted username.
	 * @param string               $email       Submitted email.
	 * @param array<string, mixed> $posted_data Posted data.
	 *
	 * @return array<string, mixed>
	 */
	private function normalize_registration_data( string $username, string $email, array $posted_data ): array {
		$submitted_data = $this->extract_internal_fields( $posted_data );

		if ( '' !== $username ) {
			$submitted_data['user_login'] = $username;
		}

		if ( '' !== $email ) {
			$submitted_data['user_email'] = $email;
		}

		return $submitted_data;
	}

	/**
	 * Extract internal 2o2code Spamless Forms fields from posted data.
	 *
	 * @param array<string, mixed> $posted_data Posted data.
	 *
	 * @return array<string, mixed>
	 */
	private function extract_internal_fields( array $posted_data ): array {
		$internal_fields = array();

		foreach ( $this->get_internal_field_names() as $field_name ) {
			if ( array_key_exists( $field_name, $posted_data ) ) {
				$internal_fields[ $field_name ] = $posted_data[ $field_name ];
			}
		}

		return $internal_fields;
	}

	/**
	 * Get internal field names.
	 *
	 * @return array<int, string>
	 */
	private function get_internal_field_names(): array {
		return array(
			ProtectionFieldRenderer::HONEYPOT_FIELD,
			ProtectionFieldRenderer::TOKEN_FIELD,
			ProtectionFieldRenderer::STARTED_AT_FIELD,
		);
	}
}