<?php
/**
 * Private administrator endpoint for the Free PDF sample.
 *
 * @package Leanmerce\CommerceCompliance
 */

namespace Leanmerce\CommerceCompliance\Admin;

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

use Leanmerce\CommerceCompliance\Application\Document\BasicPdfPreviewService;
use Leanmerce\CommerceCompliance\Application\Setup\LanguageCatalog;
use Leanmerce\CommerceCompliance\Application\Setup\SettingsRepository;
use Leanmerce\CommerceCompliance\Core\Capabilities;
use Leanmerce\CommerceCompliance\Infrastructure\WordPress\RequestGuard;

final class BasicPdfPreviewController {
	public function __construct( private readonly BasicPdfPreviewService $preview, private readonly SettingsRepository $settings ) {}

	public function register(): void {
		add_action( 'admin_post_lmcc_basic_pdf_preview', array( $this, 'handle' ) );
	}

	public function handle(): void {
		if ( ! current_user_can( Capabilities::MANAGE_SETTINGS ) ) {
			wp_die( esc_html__( 'You are not allowed to preview this document.', 'leanmerce-commerce-assistant' ), '', array( 'response' => 403 ) );
		}
		RequestGuard::unique_query( array( 'language', 'disposition', '_wpnonce' ) );
		if ( ! wp_verify_nonce( RequestGuard::nonce( 'lmcc_basic_pdf_preview' ), 'lmcc_basic_pdf_preview' ) ) {
			RequestGuard::reject( 403 );
		}
		if ( ! is_string( $_GET['language'] ?? null ) || ! is_string( $_GET['disposition'] ?? 'inline' ) ) {
			RequestGuard::reject( 400 );
		}
		$language    = isset( $_GET['language'] ) ? sanitize_key( wp_unslash( $_GET['language'] ) ) : '';
		$disposition = isset( $_GET['disposition'] ) ? sanitize_key( wp_unslash( $_GET['disposition'] ) ) : 'inline';
		$settings    = $this->settings->get_settings();
		$enabled     = array_values( array_intersect( LanguageCatalog::supported_codes(), array_map( 'strval', (array) ( $settings['languages']['enabled_customer_languages'] ?? array() ) ) ) );
		if ( ! in_array( $language, $enabled, true ) || ! in_array( $disposition, array( 'inline', 'attachment' ), true ) ) {
			wp_die( esc_html__( 'The requested preview language or download mode is not available.', 'leanmerce-commerce-assistant' ), '', array( 'response' => 400 ) );
		}
		$pdf = $this->preview->render( $language );
		if ( function_exists( 'nocache_headers' ) ) {
			nocache_headers();
		}
		header( 'Content-Type: application/pdf' );
		header( 'X-Content-Type-Options: nosniff' );
		header( 'Content-Disposition: ' . $disposition . '; filename="leanmerce-order-sample-' . $language . '.pdf"' );
		header( 'Content-Length: ' . strlen( $pdf ) );
		echo $pdf; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- Binary PDF generated by the internal renderer.
		exit;
	}

	public static function url( string $language, string $disposition ): string {
		return wp_nonce_url(
			add_query_arg(
				array(
					'action'      => 'lmcc_basic_pdf_preview',
					'language'    => $language,
					'disposition' => $disposition,
				),
				admin_url( 'admin-post.php' )
			),
			'lmcc_basic_pdf_preview'
		);
	}
}