<?php

declare(strict_types=1);

namespace Cepis\Tests;

use Cepis\NetworkException;
use Cepis\Response;
use Cepis\Transport;

/**
 * A {@see Transport} over PHP streams rather than curl — roughly the shape a
 * WordPress plugin's `wp_remote_get` implementation takes, and proof that the
 * seam is implementable against a different HTTP stack in a few lines.
 */
final class StreamTransport implements Transport
{
    public function get(string $url, array $headers, float $timeout): Response
    {
        $lines = '';
        foreach ($headers as $name => $value) {
            $lines .= $name . ': ' . $value . "\r\n";
        }

        $context = stream_context_create(['http' => [
            'method' => 'GET',
            'header' => $lines,
            'timeout' => $timeout,
            'ignore_errors' => true,
        ]]);

        $body = @file_get_contents($url, false, $context);
        if ($body === false) {
            throw new NetworkException('could not reach ' . $url);
        }

        $status = 0;
        $received = [];
        foreach ($http_response_header ?? [] as $line) {
            if (preg_match('#^HTTP/\S+\s+(\d{3})#', $line, $match) === 1) {
                $status = (int) $match[1];
                continue;
            }
            $parts = explode(':', $line, 2);
            if (count($parts) === 2) {
                $received[trim($parts[0])][] = trim($parts[1]);
            }
        }

        return new Response($status, $received, $body);
    }
}