<?php

namespace App\Console\Commands;

use App\Models\BackofficeStatisticsSnapshot;
use App\Services\Backoffice\BackofficeDashboardService;
use App\User;
use Carbon\Carbon;
use Illuminate\Console\Command;

class BackofficeStoreStatisticsSnapshots extends Command
{
    /**
     * The name and signature of the console command.
     *
     * @var string
     */
    protected $signature = 'backoffice:store-statistics-snapshots
                            {--user= : Nur einen bestimmten User berechnen (user_id)}
                            {--month= : Nur einen bestimmten Monat berechnen}
                            {--year= : Nur ein bestimmtes Jahr berechnen}
                            {--force : Bereits vorhandene Snapshots überschreiben}';

    /**
     * The console command description.
     *
     * @var string
     */
    protected $description = 'Speichert Backoffice-Statistik-Snapshots fuer abgeschlossene Monate';

    /**
     * Execute the console command.
     */
    public function handle(BackofficeDashboardService $dashboardService): int
    {
        $months = $this->monthsToStore();
        $force = (bool) $this->option('force');

        if ($months === []) {
            $this->info('Keine abgeschlossenen Monate zum Speichern.');

            return self::SUCCESS;
        }

        $userQuery = User::query()
            ->where('admin', '>=', 1)
            ->where('admin', '<', 4)
            ->whereNull('deleted_at');

        if ($userId = $this->option('user')) {
            $userQuery->where('id', $userId);
        }

        $users = $userQuery->get();
        $this->info('Berechne Backoffice-Snapshots fuer '.$users->count().' User und '.count($months).' Monate...');

        $bar = $this->output->createProgressBar($users->count());
        $bar->start();

        $stored = 0;
        $skipped = 0;

        foreach ($users as $user) {
            foreach ($months as [$year, $month]) {
                $exists = BackofficeStatisticsSnapshot::query()
                    ->where('user_id', $user->id)
                    ->where('year', $year)
                    ->where('month', $month)
                    ->exists();

                if ($exists && ! $force) {
                    $skipped++;

                    continue;
                }

                $dashboardService->storeSnapshot($user, $month, $year);
                $stored++;
            }

            $bar->advance();
            gc_collect_cycles();
        }

        $bar->finish();
        $this->newLine();
        $this->info("Fertig. Gespeichert: {$stored}, uebersprungen: {$skipped}");

        return self::SUCCESS;
    }

    /**
     * @return array<array{int, int}>
     */
    private function monthsToStore(): array
    {
        $monthOption = $this->option('month');
        $yearOption = $this->option('year');

        if ($monthOption && $yearOption) {
            $month = max(1, min(12, (int) $monthOption));
            $year = (int) $yearOption;

            if (! $this->isClosedMonth($month, $year)) {
                return [];
            }

            return [[$year, $month]];
        }

        $months = [];
        $cursor = Carbon::create(2026, 1, 1)->startOfMonth();
        $lastClosedMonth = now()->startOfMonth()->subMonth();

        while ($cursor->lte($lastClosedMonth)) {
            $months[] = [(int) $cursor->year, (int) $cursor->month];
            $cursor->addMonth();
        }

        return $months;
    }

    private function isClosedMonth(int $month, int $year): bool
    {
        return Carbon::create($year, $month, 1)->endOfMonth()->lt(now()->startOfMonth());
    }
}