<?php

namespace App\Services;

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

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

    public function initiateTopUp(
        User $user,
        float $amount,
        string $idempotencyKey,
        ?string $returnUrl = null,
    ): PaymentTransaction {
        $minAmount = (float) config('laverie.payment.top_up_min', 5);
        $maxAmount = (float) config('laverie.payment.top_up_max', 150);

        if ($amount < $minAmount || $amount > $maxAmount) {
            throw new \InvalidArgumentException(
                "Le montant doit être compris entre {$minAmount} et {$maxAmount} EUR.",
            );
        }

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

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

        $provider = config('laverie.payment.default_provider', 'simulated');

        if ($provider === 'stripe' && ! $this->stripePaymentService->isEnabled()) {
            throw new \RuntimeException('Stripe n\'est pas configuré.');
        }

        return DB::transaction(function () use ($user, $amount, $idempotencyKey, $returnUrl, $provider) {
            $payment = PaymentTransaction::query()->create([
                'uuid' => (string) Str::uuid(),
                'user_id' => $user->id,
                'provider' => $provider,
                'provider_payment_id' => null,
                'amount' => $amount,
                'currency' => 'EUR',
                'status' => 'initiated',
                'idempotency_key' => $idempotencyKey,
                'return_url' => $returnUrl,
            ]);

            if ($provider === 'stripe') {
                try {
                    $intent = $this->stripePaymentService->createPaymentIntent($user, $payment, $amount);
                } catch (ApiErrorException $e) {
                    throw new \RuntimeException('Impossible de créer le paiement Stripe.', 0, $e);
                }

                $payment->update([
                    'provider_payment_id' => $intent->id,
                    'status' => 'pending',
                    'raw_payload' => [
                        'client_secret' => $intent->client_secret,
                    ],
                ]);
            } else {
                $payment->update([
                    'provider_payment_id' => 'sim-'.Str::random(16),
                ]);
            }

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

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

    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}).");
            }

            if ($payment->provider === 'stripe') {
                if (blank($payment->provider_payment_id)) {
                    throw new \RuntimeException('Paiement Stripe introuvable.');
                }

                try {
                    $intent = $this->stripePaymentService->retrievePaymentIntent($payment->provider_payment_id);
                } catch (ApiErrorException $e) {
                    throw new \RuntimeException('Impossible de vérifier le paiement Stripe.', 0, $e);
                }

                if (! $this->stripePaymentService->isPaymentSucceeded($intent)) {
                    throw new \RuntimeException('Le paiement Stripe n\'est pas encore confirmé.');
                }

                $payment->update([
                    'raw_payload' => array_merge($payment->raw_payload ?? [], [
                        'stripe' => $this->stripePaymentService->summarizePaymentIntent($intent),
                    ]),
                ]);
            }

            return $this->markPaymentSucceeded($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.');
        }

        if ($status === 'ignored') {
            return;
        }

        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;
            }

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

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

    public function handleStripeWebhook(string $payload, string $signature): void
    {
        $parsed = $this->stripePaymentService->parseWebhook($payload, $signature);

        if ($parsed['status'] === 'ignored') {
            return;
        }

        $this->handleWebhook('stripe', [
            'provider_payment_id' => $parsed['provider_payment_id'],
            'status' => $parsed['status'],
            'payload' => $parsed['payload'],
        ]);
    }

    private function markPaymentSucceeded(PaymentTransaction $payment): PaymentTransaction
    {
        if ($payment->status === 'succeeded') {
            return $payment;
        }

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

        $this->walletService->credit(
            $payment->user,
            (float) $payment->amount,
            PaymentTransaction::class,
            $payment->id,
            "payment-credit:{$payment->uuid}",
            $this->buildWalletCreditMetadata($payment),
        );

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

        return $payment->fresh();
    }

    /**
     * @return array<string, mixed>
     */
    private function buildWalletCreditMetadata(PaymentTransaction $payment): array
    {
        $metadata = [
            'operation' => 'top_up',
            'provider' => $payment->provider,
            'label' => match ($payment->provider) {
                'stripe' => 'Rechargement par carte',
                'simulated' => 'Rechargement (simulation)',
                default => 'Rechargement portefeuille',
            },
            'payment_uuid' => $payment->uuid,
            'provider_payment_id' => $payment->provider_payment_id,
            'currency' => $payment->currency,
            'amount' => (float) $payment->amount,
        ];

        $raw = $payment->raw_payload ?? [];

        if ($payment->provider === 'stripe') {
            $metadata['stripe'] = $raw['stripe'] ?? [
                'payment_intent_id' => $payment->provider_payment_id,
                'status' => 'succeeded',
            ];
        }

        return $metadata;
    }
}