<?php

namespace App\Console\Commands;

use Illuminate\Console\Command;

class CheckUpdates extends Command
{
    protected $signature = 'clubird:check-updates|mailwolt:check-updates';
    protected $description = 'Check for newer CluBird releases via git tags';

    public function handle(): int
    {
        $currentNorm = $this->readInstalledVersionNorm();
        $currentRaw  = $this->readInstalledVersionRaw() ?? ($currentNorm ? 'v'.$currentNorm : null);

        $appPath    = base_path();
        $remoteFile = '/var/lib/mailwolt/version_remote';

        // Fallback-Kette für Remote-Tags (erste funktionierende Methode gewinnt):
        //   1. mailwolt-update --check-only  (sudoers: mailwolt-update)
        //   2. mailwolt-fetch-tags           (sudoers: mailwolt-fetch-tags)
        //   3. Gitea/GitHub API (kein Auth nötig wenn Repo öffentlich)
        //   4. git ls-remote (klappt wenn Credentials im git-Config)
        //   5. git fetch --tags direkt
        $updateBin   = '/usr/local/sbin/mailwolt-update';
        $fetchHelper = '/usr/local/sbin/mailwolt-fetch-tags';

        $fetched = false;

        if (file_exists($updateBin) && str_contains((string) @file_get_contents($updateBin), '--check-only')) {
            @exec('sudo -n ' . escapeshellarg($updateBin) . ' --check-only 2>/dev/null', $_, $rc);
            $fetched = ($rc === 0);
        }

        if (!$fetched && file_exists($fetchHelper)) {
            @exec('sudo -n ' . escapeshellarg($fetchHelper) . ' 2>/dev/null', $_, $rc);
            $fetched = ($rc === 0);
        }

        // Gitea/GitHub API – funktioniert ohne Credentials wenn Repo öffentlich
        if (!$fetched) {
            $remoteUrl = trim((string) @shell_exec('git -C ' . escapeshellarg($appPath) . ' remote get-url origin 2>/dev/null'));
            if (preg_match('~https?://([^/]+)/([^/]+/[^/]+?)(?:\.git)?$~', $remoteUrl, $rm)) {
                $host    = $rm[1];
                $project = $rm[2];
                // Gitea API
                $apiUrl  = "https://{$host}/api/v1/repos/{$project}/tags?limit=50";
                $ctx     = stream_context_create(['http' => ['timeout' => 5, 'ignore_errors' => true]]);
                $json    = @file_get_contents($apiUrl, false, $ctx);
                if ($json) {
                    $tags = json_decode($json, true);
                    if (is_array($tags)) {
                        $versions = [];
                        foreach ($tags as $t) {
                            $name = $t['name'] ?? '';
                            if (preg_match('/^v[\d.]+$/', $name)) {
                                $versions[] = $name;
                            }
                        }
                        usort($versions, 'version_compare');
                        $latest = end($versions);
                        if ($latest) {
                            @mkdir(dirname($remoteFile), 0755, true);
                            file_put_contents($remoteFile, $latest);
                            $fetched = true;
                        }
                    }
                }
            }
        }

        // git ls-remote (klappt wenn Credentials im git-Config hinterlegt sind)
        if (!$fetched) {
            $lsOut = [];
            @exec('git -C ' . escapeshellarg($appPath) . ' ls-remote --tags origin \'v*\' 2>/dev/null', $lsOut);
            $lsVersions = [];
            foreach ($lsOut as $line) {
                if (preg_match('~refs/tags/(v[\d.]+)$~', $line, $m)) {
                    $lsVersions[] = $m[1];
                }
            }
            if (!empty($lsVersions)) {
                usort($lsVersions, 'version_compare');
                $latest = end($lsVersions);
                @mkdir(dirname($remoteFile), 0755, true);
                file_put_contents($remoteFile, $latest);
                $fetched = true;
            }
        }

        // Direkter git fetch als letzter Fallback
        if (!$fetched) {
            @exec('git -C ' . escapeshellarg($appPath) . ' fetch --tags origin 2>/dev/null', $_, $rc);
        }

        // version_remote von Helfer geschrieben; als frisch wenn < 2h alt
        $remoteRaw  = '';
        if (file_exists($remoteFile) && (time() - filemtime($remoteFile)) < 7200) {
            $remoteRaw = trim((string) file_get_contents($remoteFile));
        }

        // Lokale Tags (nach fetch hoffentlich aktuell)
        $out = [];
        @exec("git -C " . escapeshellarg($appPath) . " tag -l 'v*' --sort=-v:refname 2>/dev/null", $out);
        $latestTagRaw = $remoteRaw !== '' ? $remoteRaw : trim($out[0] ?? '');

        $latestNorm = $this->normalizeVersion($latestTagRaw);

        if (!$latestNorm) {
            cache()->forget('updates:latest');
            cache()->forget('updates:latest_raw');
            cache()->forget('mailwolt.update_available');
            $this->warn('Keine Release-Tags gefunden.');
            return self::SUCCESS;
        }

        if ($currentNorm && version_compare($latestNorm, $currentNorm, '>')) {
            cache()->forever('updates:latest', $latestNorm);
            cache()->forever('updates:latest_raw', $latestTagRaw ?: ('v'.$latestNorm));
            cache()->forever('mailwolt.update_available', $latestNorm);
            $this->info("Update verfügbar: {$latestTagRaw} (installiert: ".($currentRaw ?? $currentNorm).")");
        } else {
            cache()->forget('updates:latest');
            cache()->forget('updates:latest_raw');
            cache()->forget('mailwolt.update_available');
            $this->info("Aktuell (installiert: ".($currentRaw ?? $currentNorm ?? 'unbekannt').").");
        }

        cache()->put('updates:last_checked_at', now(), now()->addMinutes(10));
        return self::SUCCESS;
    }

    /* ===== Helpers ===== */

    private function readInstalledVersionNorm(): ?string
    {
        // version_raw ist die zuverlässigste Quelle – wird vom Update-Script geschrieben
        $rawVer = $this->normalizeVersion($this->readInstalledVersionRaw() ?? '');

        $fileVer = null;
        foreach (['/var/lib/mailwolt/version', base_path('VERSION')] as $p) {
            $raw = @trim(@file_get_contents($p) ?: '');
            if ($raw !== '') { $fileVer = $this->normalizeVersion($raw); break; }
        }

        // version_raw bevorzugen (echter installierter Stand)
        // Nur wenn version_raw fehlt: version-Datei oder git-Tag als Fallback
        if ($rawVer) {
            return $rawVer;
        }

        // git-Tag als letzter Fallback (funktioniert auf Dev-Servern)
        $out = [];
        @exec('git -C ' . escapeshellarg(base_path()) . ' describe --tags --abbrev=0 2>/dev/null', $out);
        $gitVer = $this->normalizeVersion(trim($out[0] ?? ''));

        if ($gitVer && (!$fileVer || version_compare($gitVer, $fileVer, '>'))) {
            return $gitVer;
        }
        return $fileVer ?: null;
    }

    private function readInstalledVersionRaw(): ?string
    {
        $p = '/var/lib/mailwolt/version_raw';
        $raw = @trim(@file_get_contents($p) ?: '');
        return $raw !== '' ? $raw : null;
    }

    private function normalizeVersion(?string $v): ?string
    {
        if (!$v) return null;
        $v = trim($v);
        if ($v === '') return null;
        $v = ltrim($v, "vV \t\n\r\0\x0B");
        $v = preg_replace('/-.*$/', '', $v);
        return $v !== '' ? $v : null;
    }
}