<?php

declare(strict_types=1);

namespace Monitor\Api\Sync;

use RuntimeException;

final class CurlCodebergClient implements CodebergClient
{
    private const PER_PAGE = 50;
    private const MAX_PAGES = 20;

    public function __construct(
        private readonly string $apiBase,
        private readonly ?string $token = null,
    ) {
    }

    public function listIssues(string $owner, string $repo, string $state): array
    {
        $issues = [];

        for ($page = 1; $page <= self::MAX_PAGES; $page++) {
            $url = sprintf(
                '%s/repos/%s/%s/issues?state=%s&type=issues&page=%d&limit=%d',
                $this->apiBase,
                rawurlencode($owner),
                rawurlencode($repo),
                rawurlencode($state),
                $page,
                self::PER_PAGE
            );

            $pageIssues = $this->fetch($url);
            if ($pageIssues === []) {
                break;
            }

            foreach ($pageIssues as $issue) {
                $issues[] = [
                    'number' => (int) $issue['number'],
                    'title' => (string) $issue['title'],
                    'body' => isset($issue['body']) ? (string) $issue['body'] : null,
                    'labels' => array_map(
                        static fn (array $label): array => [
                            'name' => (string) $label['name'],
                            'color' => (string) $label['color'],
                        ],
                        $issue['labels'] ?? []
                    ),
                ];
            }

            if (count($pageIssues) < self::PER_PAGE) {
                break;
            }
        }

        return $issues;
    }

    /** @return array<int, array<string, mixed>> */
    private function fetch(string $url): array
    {
        $headers = ['Accept: application/json'];
        if ($this->token !== null && $this->token !== '') {
            $headers[] = 'Authorization: token ' . $this->token;
        }

        $ch = curl_init($url);
        curl_setopt_array($ch, [
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_HTTPHEADER => $headers,
            CURLOPT_TIMEOUT => 15,
        ]);
        $body = curl_exec($ch);
        $status = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        $error = curl_error($ch);
        curl_close($ch);

        if ($body === false) {
            throw new RuntimeException('Codeberg-API nicht erreichbar: ' . $error);
        }
        if ($status >= 400) {
            throw new RuntimeException('Codeberg-API-Fehler (HTTP ' . $status . '): ' . $body);
        }

        $decoded = json_decode((string) $body, true);

        return is_array($decoded) ? $decoded : [];
    }
}