<?php

namespace App\Http\Requests\Payment;

use App\Models\ShoppingPayment;
use App\Services\ManualPaymentService;
use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Validation\Rule;
use Illuminate\Validation\Validator;

/**
 * Erfassung eines Zahlungseingangs durch die Buchhaltung
 * (Plan dev/2026-08-26-stripe/, Phase SE4).
 *
 * Der Verwendungszweck bzw. die Bankreferenz ist Pflicht — sie ist der Beleg,
 * mit dem die Buchung später nachvollziehbar bleibt.
 */
class RecordManualPaymentRequest extends FormRequest
{
    public function authorize(): bool
    {
        // Die Route liegt hinter der admin-Middleware.
        return true;
    }

    /**
     * @return array<string, array<int, mixed>>
     */
    public function rules(): array
    {
        return [
            'id' => ['required', 'integer', 'exists:shopping_orders,id'],
            'payment_id' => ['required', 'integer', 'exists:shopping_payments,id'],
            'paid_at' => ['required', 'date', 'before_or_equal:today'],
            'amount' => ['required', 'numeric', 'min:0.01', 'max:99999'],
            'method' => ['required', Rule::in(array_keys(ManualPaymentService::methods()))],
            'bank_reference' => ['required', 'string', 'max:255'],
            'note' => ['nullable', 'string', 'max:1000'],
            'send_mail' => ['nullable', 'boolean'],
            'confirm_deviation' => ['nullable', 'boolean'],
            'back' => ['nullable', 'string'],
        ];
    }

    /**
     * @return array<string, string>
     */
    public function messages(): array
    {
        return [
            'bank_reference.required' => __('payment.manual_error_reference_required'),
            'paid_at.before_or_equal' => __('payment.manual_error_future_date'),
        ];
    }

    /**
     * Ein abweichender Betrag ist erlaubt (Teilzahlung, Rundungsdifferenz),
     * muss aber bewusst bestätigt werden — sonst wird aus einem Tippfehler
     * still eine falsche Buchung.
     */
    public function withValidator(Validator $validator): void
    {
        $validator->after(function (Validator $validator): void {
            if ($validator->errors()->isNotEmpty()) {
                return;
            }

            $payment = ShoppingPayment::find($this->integer('payment_id'));
            if (! $payment) {
                return;
            }

            if ($this->amountCents() !== (int) $payment->amount && ! $this->boolean('confirm_deviation')) {
                $validator->errors()->add('amount', __('payment.manual_error_amount_deviation', [
                    'expected' => number_format($payment->amount / 100, 2, ',', '.'),
                ]));
            }
        });
    }

    /**
     * Erfasster Betrag in Cent (die Zahlungen werden in Cent geführt).
     */
    public function amountCents(): int
    {
        return (int) round(((float) str_replace(',', '.', (string) $this->input('amount'))) * 100);
    }

    /**
     * @return array{amount_cents: int, paid_at: string, method: string, bank_reference: string, note: string|null, send_mail: bool}
     */
    public function toServiceData(): array
    {
        return [
            'amount_cents' => $this->amountCents(),
            'paid_at' => (string) $this->input('paid_at'),
            'method' => (string) $this->input('method'),
            'bank_reference' => trim((string) $this->input('bank_reference')),
            'note' => $this->filled('note') ? trim((string) $this->input('note')) : null,
            'send_mail' => $this->boolean('send_mail'),
        ];
    }
}