<?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) $issue['body'] : null,
                    'author' => self::authorLogin($issue),
                    '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;
    }

    public function listOpenPullRequests(string $owner, string $repo): array
    {
        $pulls = [];

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

            $pagePulls = $this->fetch($url);

            foreach ($pagePulls as $pull) {
                $pulls[] = [
                    'number' => (int) $pull['number'],
                    'title' => (string) ($pull['title'] ?? ''),
                    'body' => isset($pull['body']) ? (string) $pull['body'] : null,
                    'author' => self::authorLogin($pull),
                ];
            }

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

        return $pulls;
    }

    /**
     * Issue #113: Login des Kontos, das Issue/PR angelegt hat (Feld "user" der Codeberg-API).
     *
     * @param array<string, mixed> $item
     */
    private static function authorLogin(array $item): ?string
    {
        $login = is_array($item['user'] ?? null) ? ($item['user']['login'] ?? null) : null;

        return is_string($login) && $login !== '' ? $login : null;
    }

    public function repoPermissions(string $owner, string $repo): array
    {
        $url = sprintf('%s/repos/%s/%s', $this->apiBase, rawurlencode($owner), rawurlencode($repo));
        $data = $this->fetch($url);
        $permissions = is_array($data['permissions'] ?? null) ? $data['permissions'] : [];

        return ['push' => (bool) ($permissions['push'] ?? false)];
    }

    public function listWebhooks(string $owner, string $repo): array
    {
        $url = sprintf('%s/repos/%s/%s/hooks', $this->apiBase, rawurlencode($owner), rawurlencode($repo));
        $data = $this->fetch($url);

        return array_map(
            static fn (array $hook): array => [
                'active' => (bool) ($hook['active'] ?? false),
                'url' => (string) ($hook['config']['url'] ?? ''),
                'content_type' => (string) ($hook['config']['content_type'] ?? ''),
            ],
            $data
        );
    }

    /** @return array<int|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 CodebergApiException($status, 'Codeberg-API-Fehler (HTTP ' . $status . '): ' . $body);
        }

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

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