<?php

namespace App\Console\Commands;

use App\Enums\CompanyType;
use App\Models\Company;
use App\Models\User;
use App\Scopes\PortalScope;
use Illuminate\Console\Command;
use Illuminate\Support\Facades\Storage;

/**
 * Übernimmt die Namen der Legacy-Agentur-Firmen (companies.type = agency)
 * in das Profilfeld users.agency_name des jeweiligen Owners — Teil des
 * Umbaus Agentur-Attribution → User-Profil (dev/agentur-attribution/
 * entwicklungsplan.md, A2). Läuft im Go-Live NACH dem Firmen-/User-Import
 * und VOR companies:retire-agency-type. Wiederholbar: bereits gesetzte
 * agency_name-Werte werden nie überschrieben.
 *
 * Verwendung:
 *   php artisan legacy:migrate-agency-names --dry-run
 *   php artisan legacy:migrate-agency-names
 */
class MigrateLegacyAgencyNames extends Command
{
    protected $signature = 'legacy:migrate-agency-names
                            {--dry-run : Nur anzeigen und Report schreiben, keine User ändern}';

    protected $description = 'Übernimmt Namen der Legacy-Agentur-Firmen in das Profilfeld users.agency_name.';

    public function handle(): int
    {
        $dryRun = (bool) $this->option('dry-run');

        if ($dryRun) {
            $this->warn('[DRY-RUN] Kein tatsächlicher Schreibvorgang.');
        }

        // Bewusst ohne is_active-Filter: die Attributions-Zeile hat auch
        // inaktive Agentur-Firmen angezeigt; dieses Verhalten bleibt erhalten.
        $agencies = Company::withoutGlobalScope(PortalScope::class)
            ->where('type', CompanyType::Agency)
            ->get(['id', 'portal', 'owner_user_id', 'name', 'is_active', 'updated_at']);

        $report = [
            'generated_at' => now()->toIso8601String(),
            'dry_run' => $dryRun,
            'summary' => [],
            'multiple_names' => [],
            'skipped_existing' => [],
            'ownerless' => [],
            'missing_owner' => [],
        ];

        foreach ($agencies->whereNull('owner_user_id') as $orphan) {
            $report['ownerless'][] = [
                'company_id' => $orphan->id,
                'portal' => $orphan->portal?->value,
                'name' => $orphan->name,
            ];
        }

        $byOwner = $agencies->whereNotNull('owner_user_id')->groupBy('owner_user_id');
        $users = User::withTrashed()->whereIn('id', $byOwner->keys())->get()->keyBy('id');

        $migrated = 0;

        foreach ($byOwner as $userId => $companies) {
            $user = $users->get($userId);

            if ($user === null) {
                $report['missing_owner'][] = [
                    'user_id' => $userId,
                    'company_ids' => $companies->pluck('id')->all(),
                ];

                continue;
            }

            /** @var Company $winner Zuletzt aktualisierter Datensatz gewinnt (Regel Mehrfach-Fälle). */
            $winner = $companies->sortByDesc('updated_at')->first();
            $variants = $companies->pluck('name')->unique()->values();

            if ($variants->count() > 1) {
                $report['multiple_names'][] = [
                    'user_id' => $user->id,
                    'email' => $user->email,
                    'chosen' => $winner->name,
                    'variants' => $variants->all(),
                ];
            }

            if (filled($user->agency_name)) {
                $report['skipped_existing'][] = [
                    'user_id' => $user->id,
                    'email' => $user->email,
                    'existing' => $user->agency_name,
                    'candidate' => $winner->name,
                ];

                continue;
            }

            if (! $dryRun) {
                $user->update(['agency_name' => $winner->name]);
            }

            $migrated++;
        }

        $report['summary'] = [
            'agency_companies' => $agencies->count(),
            'users_migrated' => $migrated,
            'users_skipped_existing' => count($report['skipped_existing']),
            'users_multiple_names' => count($report['multiple_names']),
            'companies_ownerless' => count($report['ownerless']),
            'owners_missing' => count($report['missing_owner']),
        ];

        $this->table(
            ['Agentur-Firmen', 'User migriert', 'Bereits gesetzt', 'Mehrfach-Namen', 'Ohne Owner', 'Owner fehlt'],
            [array_values($report['summary'])],
        );

        $path = 'migration/agency-names-'.now()->format('Ymd-His').'.json';
        Storage::disk('local')->put($path, json_encode($report, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE));
        $this->line("Report geschrieben: storage/app/private/{$path}");

        return self::SUCCESS;
    }
}