<?php

namespace App\Services;

use App\Models\PaymentTransaction;
use App\Models\User;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Str;

class PaymentService
{
    public function __construct(
        private readonly WalletService $walletService,
        private readonly AuditService $auditService,
    ) {}

    public function initiateTopUp(
        User $user,
        float $amount,
        string $idempotencyKey,
        ?string $returnUrl = null,
    ): PaymentTransaction {
        if ($amount <= 0) {
            throw new \InvalidArgumentException('Le montant doit être strictement positif.');
        }

        $existing = PaymentTransaction::query()
            ->where('idempotency_key', $idempotencyKey)
            ->first();

        if ($existing !== null) {
            return $existing;
        }

        $payment = PaymentTransaction::query()->create([
            'uuid' => (string) Str::uuid(),
            'user_id' => $user->id,
            'provider' => config('laverie.payment.default_provider', 'simulated'),
            'provider_payment_id' => 'sim-'.Str::random(16),
            'amount' => $amount,
            'currency' => 'EUR',
            'status' => 'initiated',
            'idempotency_key' => $idempotencyKey,
            'return_url' => $returnUrl,
        ]);

        $this->auditService->log($user, 'payment.initiated', $payment, null, $payment->toArray());

        return $payment;
    }

    public function confirmTopUp(string $paymentUuid): PaymentTransaction
    {
        return DB::transaction(function () use ($paymentUuid) {
            $payment = PaymentTransaction::query()
                ->where('uuid', $paymentUuid)
                ->lockForUpdate()
                ->firstOrFail();

            if ($payment->status === 'succeeded') {
                return $payment;
            }

            if (! in_array($payment->status, ['initiated', 'pending'], true)) {
                throw new \RuntimeException("Paiement non confirmable (statut : {$payment->status}).");
            }

            $payment->update(['status' => 'succeeded']);

            $this->walletService->credit(
                $payment->user,
                (float) $payment->amount,
                PaymentTransaction::class,
                $payment->id,
                "payment-credit:{$payment->uuid}",
                ['provider' => $payment->provider],
            );

            $this->auditService->log(
                $payment->user,
                'payment.confirmed',
                $payment,
                null,
                $payment->fresh()->toArray(),
            );

            return $payment->fresh();
        });
    }

    public function handleWebhook(string $provider, array $payload): void
    {
        $providerPaymentId = $payload['provider_payment_id'] ?? $payload['payment_id'] ?? null;
        $idempotencyKey = $payload['idempotency_key'] ?? null;
        $status = $payload['status'] ?? 'succeeded';

        if ($providerPaymentId === null && $idempotencyKey === null) {
            throw new \InvalidArgumentException('Webhook paiement invalide.');
        }

        DB::transaction(function () use ($provider, $payload, $providerPaymentId, $idempotencyKey, $status) {
            $query = PaymentTransaction::query()->lockForUpdate();

            if ($idempotencyKey !== null) {
                $payment = $query->where('idempotency_key', $idempotencyKey)->first();
            } else {
                $payment = $query
                    ->where('provider', $provider)
                    ->where('provider_payment_id', $providerPaymentId)
                    ->first();
            }

            if ($payment === null) {
                return;
            }

            if ($payment->status === 'succeeded') {
                return;
            }

            $payment->update([
                'raw_payload' => $payload,
            ]);

            if ($status === 'succeeded') {
                $this->confirmTopUp($payment->uuid);
            } elseif (in_array($status, ['failed', 'cancelled', 'refunded'], true)) {
                $payment->update(['status' => $status]);
            }
        });
    }
}