<?php

declare(strict_types=1);

namespace VPlugins\WPCloudClient\Handler;

final class PhpVerifyHandler extends AbstractHandler {

	private const REQUIREMENTS = [
		'extensions' => [
			'retrieve_func' => 'get_loaded_extensions',
			'expected'      => [
				'Core',
				'PDO',
				'Phar',
				'Reflection',
				'SPL',
				'SimpleXML',
				'bcmath',
				'bz2',
				'ctype',
				'curl',
				'date',
				'dom',
				'exif',
				'fileinfo',
				'filter',
				'ftp',
				'gd',
				'hash',
				'iconv',
				'imagick',
				'imap',
				'json',
				'libxml',
				'mbstring',
				'mysqli',
				'mysqlnd',
				'openssl',
				'pcre',
				'pdo_mysql',
				'posix',
				'readline',
				'session',
				'soap',
				'sodium',
				'standard',
				'tokenizer',
				'xml',
				'xmlreader',
				'xmlwriter',
				'zip',
				'zlib',
			],
		],
		'transports' => [
			'retrieve_func' => 'stream_get_transports',
			'expected'      => [
				'ssl',
				'tcp',
				'tls',
				'tlsv1.0',
				'tlsv1.1',
				'tlsv1.2',
				'udg',
				'udp',
				'unix',
			],
		],
		'streams'    => [
			'retrieve_func' => 'stream_get_wrappers',
			'expected'      => [
				'compress.bzip2',
				'compress.zlib',
				'data',
				'file',
				'ftp',
				'ftps',
				'glob',
				'http',
				'https',
				'phar',
				'php',
				'zip',
			],
		],
	];

	/**
	 * Return the action name.
	 *
	 * @return string Action name.
	 */
	public function action(): string {
		return 'php_verify';
	}

	/**
	 * Verify PHP extensions, transports, and stream wrappers.
	 *
	 * @param array<string, mixed> $params Action parameters.
	 * @return array<string, mixed> Verification result.
	 */
	public function execute( array $params ): array {
		$missing = [];

		foreach ( self::REQUIREMENTS as $type => $requirement ) {
			/**
			 * Retrieval function name.
			 *
			 * @var callable-string $func
			 */
			$func = $requirement['retrieve_func'];

			/**
			 * Available items from the retrieval function.
			 *
			 * @var list<string> $got
			 */
			$got = $func();

			$got = array_flip( $got );
			foreach ( $requirement['expected'] as $item ) {
				if ( ! isset( $got[ $item ] ) ) {
					if ( ! isset( $missing[ $type ] ) ) {
						$missing[ $type ] = [];
					}
					$missing[ $type ][] = $item;
				}
			}
		}

		if ( empty( $missing ) ) {
			return [ 'all_good' => true ];
		}

		return [ 'missing' => $missing ];
	}
}