<?php

namespace App\Services\Api;

use App\Enums\UserPaymentOptionStatus;
use App\Models\User;

class ApiAccessEligibilityService
{
    public function canCreateToken(User $user): bool
    {
        return $this->denialReason($user) === null;
    }

    public function denialReason(User $user): ?string
    {
        if (! $user->is_active) {
            return 'Ihr Benutzerkonto ist nicht aktiv. API-Tokens können nur für aktive Benutzer erstellt werden.';
        }

        if ($this->hasActivePaymentOption($user) || $this->hasPaidLegacyInvoice($user)) {
            return null;
        }

        return 'API-Tokens werden erst freigeschaltet, wenn ein aktiver Zahlungsstatus oder freigegebener Bestandsschutz vorliegt.';
    }

    private function hasActivePaymentOption(User $user): bool
    {
        return $user->userPaymentOptions()
            ->where(function ($query): void {
                $query
                    ->where(function ($active): void {
                        $active
                            ->where('status', UserPaymentOptionStatus::Active->value)
                            ->whereDate('current_period_start', '<=', now())
                            ->whereDate('current_period_end', '>=', now());
                    })
                    ->orWhere(function ($grandfathered): void {
                        $grandfathered
                            ->where('status', UserPaymentOptionStatus::Grandfathered->value)
                            ->whereDate('grandfathered_until', '>=', now());
                    });
            })
            ->exists();
    }

    private function hasPaidLegacyInvoice(User $user): bool
    {
        $latestInvoice = $user->legacyInvoices()
            ->latest('invoice_date')
            ->latest('id')
            ->first(['id', 'status']);

        return $latestInvoice?->status === 'paid';
    }
}