<?php

namespace App\Services\Pagarme;

use App\Models\Payment;
use App\Models\PaymentTransfer;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Log;

class PagarmePaymentService
{
    public function createOrderWithCreditCard(
        Payment $payment,
        array   $items,
        array   $customer,
        array   $creditCard,
        array   $options = []
    ): array {
        $paymentMethod = [
            'payment_method' => 'credit_card',
            'credit_card'    => $this->buildCreditCardPayload($creditCard),
        ];

        if (! empty($options['split']) && is_array($options['split'])) {
            $paymentMethod['split'] = $options['split'];
        }

        return $this->createOrder(
            payment:       $payment,
            items:         $items,
            customer:      $customer,
            paymentMethod: $paymentMethod,
            options:       $options,
        );
    }

    public function createOrderWithPix(
        Payment $payment,
        array   $items,
        array   $customer,
        array   $pix,
        array   $options = []
    ): array {
        $paymentMethod = [
            'payment_method' => 'pix',
            'pix'            => $this->buildPixPayload($pix),
        ];

        if (! empty($options['split']) && is_array($options['split'])) {
            $paymentMethod['split'] = $options['split'];
        }

        return $this->createOrder(
            payment:       $payment,
            items:         $items,
            customer:      $customer,
            paymentMethod: $paymentMethod,
            options:       $options,
        );
    }

    public function createOrder(
        Payment $payment, 
        array   $items,
        array   $customer,
        array   $paymentMethod,
        array   $options = []
    ): array {
        if (empty($items)) {
            throw new \InvalidArgumentException('items nao pode estar vazio.');
        }

        if (empty($paymentMethod['payment_method'])) {
            throw new \InvalidArgumentException('payment_method e obrigatorio.');
        }

        if (! in_array($paymentMethod['payment_method'], ['credit_card', 'pix'], true)) {
            throw new \InvalidArgumentException('payment_method deve ser credit_card ou pix.');
        }

        $customerPayload = $options['customer_id'] ?? null;

        if (! $this->filled($customerPayload)) {
            $customerPayload = $this->filterFilledRecursive($customer);
        }

        if (empty($customerPayload)) {
            throw new \InvalidArgumentException('customer ou customer_id e obrigatorio.');
        }

        $payload = [
            'code'     => $options['order_code'] ?? "payment-{$payment->id}",
            'items'    => $this->validateItems($items),
            'payments' => [$this->filterFilledRecursive($paymentMethod)],
            'closed'   => $options['closed'] ?? true,

            'metadata' => array_merge([
                'payment_id'  => (string) $payment->id,
                'schedule_id' => (string) $payment->schedule_id,
                'client_id'   => (string) $payment->client_id,
                'provider_id' => (string) $payment->provider_id,
            ], $options['metadata'] ?? []),
        ];

        if (is_string($customerPayload)) {
            $payload['customer_id'] = $customerPayload;
        } else {
            $payload['customer'] = $customerPayload;
        }

        if (! empty($options['channel'])) {
            $payload['channel'] = $options['channel'];
        }

        $response = $this->pagarmeRequest($this->idempotencyKey($payment))
            ->post($this->pagarmeUrl('/orders'), $payload);

        if ($response->failed()) {
            Log::channel('pagarme')->error('Pagar.me order creation failed', [
                'status'  => $response->status(),
                'body'    => $response->json() ?? $response->body(),
                'payload' => $payload,
            ]);

            throw new \RuntimeException('Erro ao criar pedido de pagamento no Pagar.me.');
        }

        $order = $response->json();

        if (empty($order['id'])) {
            Log::channel('pagarme')->error('Pagar.me order creation returned empty id', [
                'payment_id' => $payment->id,
                'response'   => $order,
            ]);

            throw new \RuntimeException('Pagar.me order creation returned an empty id.');
        }

        return $order;
    }

    public function applyGatewayResponseToPayment(Payment $payment, array $orderResponse): Payment
    {
        $charge = $orderResponse['charges'][0] ?? [];

        $transaction  = $charge['last_transaction']  ?? [];
        $chargeStatus = $charge['status'] ?? null;

        $transactionStatus = $transaction['status'] ?? null;

        $payment->forceFill([
            'gateway_provider'            => 'pagarme',
            'gateway_entity_reference'    => $charge['id'] ?? $orderResponse['id'] ?? null,
            'gateway_entity_label'        => isset($charge['id']) ? 'charge' : 'order',
            'gateway_operation_reference' => $transaction['id'] ?? $charge['id'] ?? $orderResponse['id'] ?? null,
            'gateway_operation_label'     => isset($transaction['id']) ? 'transaction' : (isset($charge['id']) ? 'charge' : 'order'),
            'status'                      => $this->mapPaymentStatus($chargeStatus, $transactionStatus),
            'paid_at'                     => $this->filledArrayValue($charge, 'paid_at'),
            'authorized_at'               => $this->resolveAuthorizedAt($transactionStatus, $transaction),
            'gateway_payload'             => $orderResponse,
            'failure_code'                => $this->extractFailureCode($transaction),
            'failure_message'             => $this->extractFailureMessage($transaction),
        ])->save();

        return $payment->fresh();
    }

    /**
     * @param  Collection<int, PaymentTransfer>  $transfers
     * @return array<int, array<string, mixed>>
     */
    public function buildSplitFromTransfers(Collection $transfers): array
    {
        return $transfers
            ->filter(fn (PaymentTransfer $transfer) => ! empty($transfer->gateway_transfer_target_reference))
            ->map(function (PaymentTransfer $transfer) {
                return [
            'amount'       => $this->toGatewayAmountInCents((float) $transfer->gross_amount),
            'recipient_id' => $transfer->gateway_transfer_target_reference,
            'type'         => 'flat',
            'options'      => [
                'charge_processing_fee' => false,
                'charge_remainder_fee'  => false,
                'liable'                => false,
            ],
        ];
    })
            ->values()
            ->all();
    }

    public function toGatewayAmountInCents(float $amount): int
    {
        return (int) round($amount * 100);
    }

    //

    private function pagarmeUrl(string $path): string
    {
        return rtrim(config('services.pagarme.base_url'), '/').'/'.ltrim($path, '/');
    }

    private function idempotencyKey(Payment $payment): string
    {
        return "payment-{$payment->id}-schedule-{$payment->schedule_id}";
    }

    //

    private function buildCreditCardPayload(array $creditCard): array
    {
        $payload = [];

        foreach ([
            'installments',
            'statement_descriptor',
            'operation_type',
            'recurrence_cycle',
            'metadata',
            'extended_limit_enabled',
            'extended_limit_code',
            'merchant_category_code',
            'authentication',
            'auto_recovery',
            'payload',
            'payment_type',
            'funding_source',
            'initiated_type',
            'recurrence_model',
            'channel',
            'payment_origin',
        ] as $field) {
            if (array_key_exists($field, $creditCard) && $this->filled($creditCard[$field])) {
                $payload[$field] = $creditCard[$field];
            }
        }

        $allowedCardOptions = ['card', 'card_id', 'card_token', 'network_token'];

        $provided = array_values(array_filter(
            $allowedCardOptions,
            static fn (string $field) => ! empty($creditCard[$field])
        ));

        if (count($provided) !== 1) {
            throw new \InvalidArgumentException('Informe exatamente uma opcao entre card, card_id, card_token ou network_token.');
        }

        $selected = $provided[0];

        $payload[$selected] = $creditCard[$selected];

        return $payload;
    }

    private function buildPixPayload(array $pix): array
    {
        if (! $this->filled($pix['expires_in'] ?? null) && ! $this->filled($pix['expires_at'] ?? null)) {
            throw new \InvalidArgumentException('pix.expires_in ou pix.expires_at e obrigatorio.');
        }

        $payload = [];

        foreach (['expires_in', 'expires_at', 'additional_information'] as $field) {
            if (array_key_exists($field, $pix) && $this->filled($pix[$field])) {
                $payload[$field] = $pix[$field];
            }
        }

        return $payload;
    }

    //

    private function resolveAuthorizedAt(?string $transactionStatus, array $transaction): ?string
    {
        if (in_array($transactionStatus, ['authorized_pending_capture', 'captured', 'partial_capture'], true)) {
            return $this->filledArrayValue($transaction, 'created_at');
        }

        return null;
    }

    //

    private function extractFailureCode(array $transaction): ?string
    {
        return $this->filledArrayValue($transaction['gateway_response'] ?? [], 'code');
    }

    private function extractFailureMessage(array $transaction): ?string
    {
        return $this->filledArrayValue($transaction, 'acquirer_message');
    }

    /**
     * @param  array<int, array<string, mixed>>  $items
     * @return array<int, array<string, mixed>>
     */
    private function validateItems(array $items): array
    {
        return collect($items)
            ->map(function (array $item, int $index) {
                foreach (['code', 'amount', 'quantity'] as $field) {
                    if (! array_key_exists($field, $item) || ! $this->filled($item[$field])) {
                        throw new \InvalidArgumentException("items.{$index}.{$field} e obrigatorio.");
                    }
                }

                if ((int) $item['amount'] <= 0 || (int) $item['quantity'] <= 0) {
                    throw new \InvalidArgumentException("items.{$index}.amount e quantity devem ser maiores que zero.");
                }

                return $this->filterFilledRecursive($item);
            })
            ->values()
            ->all();
    }

    private function filledArrayValue(array $data, string $field): ?string
    {
        if (! array_key_exists($field, $data) || ! $this->filled($data[$field])) {
            return null;
        }

        return (string) $data[$field];
    }

    /**
     * @param  array<string, mixed>  $data
     * @return array<string, mixed>
     */
    private function filterFilledRecursive(array $data): array
    {
        $filtered = [];

        foreach ($data as $key => $value) {
            if (is_array($value)) {
                $value = $this->filterFilledRecursive($value);
            }

            if ($this->filled($value)) {
                $filtered[$key] = $value;
            }
        }

        return $filtered;
    }

    private function filled(mixed $value): bool
    {
        return $value !== null && $value !== '' && $value !== [];
    }

    //

    private function mapPaymentStatus(?string $chargeStatus, ?string $transactionStatus): string
    {
        $status = strtolower((string) ($transactionStatus ?: $chargeStatus));

        return match ($status) {
            'captured', 'paid'                                         => 'paid',
            'authorized_pending_capture', 'waiting_capture', 'pending' => 'authorized',
            'processing'                                               => 'processing',
            'not_authorized', 'with_error', 'failed'                   => 'failed',
            'voided', 'partial_void'                                   => 'cancelled',
            default                                                    => 'pending',
        };
    }

    //

    private function pagarmeRequest(string $idempotencyKey)
    {
        $secretKey = config('services.pagarme.secret_key');

        if (empty($secretKey)) {
            Log::channel('pagarme')->error('PAGARME_SECRET_KEY is not configured.');

            throw new \RuntimeException('PAGARME_SECRET_KEY is not configured.');
        }

        return Http::withBasicAuth($secretKey, '')
            ->withHeaders([
                'Idempotency-Key' => $idempotencyKey,
                'Content-Type'    => 'application/json',
                'Accept'          => 'application/json',
            ]);
    }
}