<?php

namespace App\Support;

use Illuminate\Support\Str;

final class BuildMeta
{
    public string $version = 'dev';
    public string $rev = '';
    public string $short = '';
    public ?string $updated = null;

    public static function detect(
        string $buildFile = '/etc/mailwolt/build.info',
        string $basePath = null
    ): self {
        $m = new self();
        $basePath ??= base_path();

        // 1) /etc/mailwolt/build.info (vom Updater)
        if (is_file($buildFile) && is_readable($buildFile)) {
            $lines = @file($buildFile, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES) ?: [];
            foreach ($lines as $line) {
                if (!str_contains($line, '=')) continue;
                [$k, $v] = explode('=', $line, 2);
                $k = trim($k); $v = trim($v);
                if ($k === 'version') $m->version = $v;
                if ($k === 'rev')     $m->rev     = $v;
                if ($k === 'updated') $m->updated = $v;
            }
        }

        // 2) Fallback: .env APP_VERSION
        if ($m->version === 'dev' && ($envVer = env('APP_VERSION'))) {
            $m->version = trim($envVer);
        }

        // 3) Fallback: Git (ohne "-dirty")
        if ($m->rev === '' || $m->version === 'dev') {
            $head = $basePath.'/.git/HEAD';
            if (is_file($head)) {
                $ref = trim((string)@file_get_contents($head));
                if (Str::startsWith($ref, 'ref:')) {
                    $refFile = $basePath.'/.git/'.substr($ref, 5);
                    $commit  = @file_get_contents($refFile);
                } else {
                    $commit  = $ref;
                }
                $m->rev = $m->rev ?: trim((string)$commit);

                if ($m->version === 'dev') {
                    $tag = @shell_exec('git -C '.escapeshellarg($basePath).' describe --tags --abbrev=0 2>/dev/null');
                    $m->version = $tag ? trim($tag) : 'dev';
                }
            }
        }

        // Sauber: "-dirty" entfernen
        $m->version = preg_replace('/-dirty$/', '', $m->version);

        // Kurz-Commit
        $m->short = $m->rev ? substr($m->rev, 0, 7) : '';

        return $m;
    }

    public function toArray(): array
    {
        return [
            'version' => $this->version,
            'rev'     => $this->rev,
            'short'   => $this->short,
            'updated' => $this->updated,
        ];
    }
}