<?php

namespace App\Console\Commands;

use App\Models\AboChartSnapshot;
use App\Models\UserAbo;
use App\Services\AboHelper;
use App\User;
use Carbon\Carbon;
use Illuminate\Console\Command;

class AboStoreChartSnapshots extends Command
{
    protected $signature = 'abo:store-chart-snapshots
                            {--user= : Nur einen bestimmten User berechnen (user_id)}
                            {--force : Bereits vorhandene Snapshots überschreiben}';

    protected $description = 'Speichert monatliche Abo-Zählungen aller vergangenen Monate in der Datenbank (einmalig je Monat)';

    private const SCOPES = ['ot', 'team_abos', 'team_cust_abos'];

    private const START_YEAR = 2026;

    public function handle(): int
    {
        $now = Carbon::now();
        $force = (bool) $this->option('force');

        // Monate die eingefroren werden sollen: von START_YEAR/01 bis letzten Monat
        $months = $this->getPastMonths($now);
        if (empty($months)) {
            $this->info('Keine vergangenen Monate zum Speichern.');

            return self::SUCCESS;
        }

        // User ermitteln
        $userQuery = User::whereNotNull('m_level')
            ->whereNotNull('payment_account')
            ->where('admin', '<', 4)
            ->whereNull('deleted_at');

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

        $users = $userQuery->select('id')->get();
        $total = $users->count();
        $this->info("Berechne Snapshots für {$total} User, ".count($months).' Monate, '.count(self::SCOPES).' Scopes...');

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

        $inserted = 0;
        $skipped = 0;

        foreach ($users as $user) {
            // Bereits vorhandene Snapshots für diesen User laden (zum Überspringen)
            $existing = AboChartSnapshot::where('user_id', $user->id)
                ->get()
                ->keyBy(fn ($s) => "{$s->scope}_{$s->year}_{$s->month}");

            $teamUserIds = AboHelper::getTeamUserIds($user->id);
            $rows = [];

            foreach ($months as [$year, $month]) {
                $startOfMonth = Carbon::create($year, $month, 1)->startOfMonth();
                $endOfMonth = Carbon::create($year, $month, 1)->endOfMonth();

                foreach (self::SCOPES as $scope) {
                    $key = "{$scope}_{$year}_{$month}";

                    if (! $force && $existing->has($key)) {
                        $skipped++;

                        continue;
                    }

                    $count = $this->calculateCount($scope, $user->id, $teamUserIds, $startOfMonth, $endOfMonth);
                    $rows[] = [
                        'user_id' => $user->id,
                        'scope' => $scope,
                        'year' => $year,
                        'month' => $month,
                        'count' => $count,
                        'calculated_at' => $now,
                        'created_at' => $now,
                        'updated_at' => $now,
                    ];
                    $inserted++;
                }
            }

            if (! empty($rows)) {
                if ($force) {
                    foreach ($rows as $row) {
                        AboChartSnapshot::updateOrInsert(
                            ['user_id' => $row['user_id'], 'scope' => $row['scope'], 'year' => $row['year'], 'month' => $row['month']],
                            $row
                        );
                    }
                } else {
                    AboChartSnapshot::insertOrIgnore($rows);
                }
            }

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

        $bar->finish();
        $this->newLine();
        $this->info("Fertig. Gespeichert: {$inserted}, Übersprungen (bereits vorhanden): {$skipped}");

        return self::SUCCESS;
    }

    /**
     * Berechnet die Abo-Anzahl für einen Scope/User/Monat anhand der tatsächlichen Daten zum Zeitpunkt der Berechnung.
     *
     * @param  int[]  $teamUserIds
     */
    private function calculateCount(string $scope, int $userId, array $teamUserIds, Carbon $startOfMonth, Carbon $endOfMonth): int
    {
        $terminalStatuses = [4, 5];

        $query = match ($scope) {
            'ot' => UserAbo::where('member_id', $userId)
                ->where('is_for', 'ot')
                ->where('status', '>', 1),
            'team_abos' => UserAbo::whereIn('user_id', $teamUserIds)
                ->where('is_for', 'me')
                ->where('status', '>', 1),
            'team_cust_abos' => UserAbo::whereIn('member_id', $teamUserIds)
                ->where('is_for', 'ot')
                ->where('status', '>', 1),
        };

        return $query
            ->whereDate('start_date', '<=', $endOfMonth)
            ->where(function ($q) use ($startOfMonth, $terminalStatuses) {
                $q->whereDate('cancel_date', '>=', $startOfMonth)
                    ->orWhere(function ($q2) use ($terminalStatuses) {
                        $q2->whereNull('cancel_date')
                            ->whereNotIn('status', $terminalStatuses);
                    });
            })
            ->count();
    }

    /**
     * Alle abgeschlossenen Monate von START_YEAR/01 bis letzten Monat.
     *
     * @return array<array{int, int}>
     */
    private function getPastMonths(Carbon $now): array
    {
        $months = [];
        $cursor = Carbon::create(self::START_YEAR, 1, 1);
        $lastMonth = $now->copy()->subMonth()->endOfMonth();

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

        return $months;
    }
}