<?php

namespace App\Services\Pagarme;

use App\Models\Client;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Log;

class PagarmeCustomerService
{
    public function createCustomerForClient(Client $client, array $data): ?string
    {
        if (! empty($client->external_customer_id)) {
            return $client->external_customer_id;
        }

        $client->loadMissing('user');

        $name  = $client->user?->name ?? $data['name'] ?? 'Cliente';
        $email = $client->user?->email ?? $data['email'] ?? null;

        $document = $this->sanitizeDigits($client->document ?? $data['document'] ?? null);

        if (empty($email) || empty($document)) {
            Log::channel('pagarme')->warning(
                'Skipping customer creation because the client is missing email or document.',
                [
                    'client_id' => $client->id,
                    'user_id'   => $client->user_id,
                ]
            );

            return null;
        }

        $address = $this->buildAddress($data);
        $phones  = $this->buildPhones($client->user?->phone ?? $data['phone'] ?? null);

        $code = $client->external_customer_code ?? "client-{$client->id}";

        $payload = [
            'name'          => $name,
            'email'         => $email,
            'document'      => $document,
            'type'          => $this->personType($document),
            'document_type' => $this->documentType($document),
            'code'          => $code,
            'address'       => $address,
        ];

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

        $response = $this->pagarmeRequest($client->id)
            ->post($this->pagarmeUrl('/customers'), $payload);

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

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

        $customerData = $response->json();
        $customerId   = $customerData['id'] ?? null;

        if (! $customerId) {
            Log::channel('pagarme')->error('Customer creation returned an empty id.', [
                'client_id' => $client->id,
                'response'  => $customerData,
            ]);

            throw new \RuntimeException('Customer creation returned an empty id.');
        }

        $client->forceFill([
            'external_customer_id'   => $customerId,
            'external_customer_code' => $code,
        ])->save();

        return $customerId;
    }

    //

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

    private function idempotencyKey(int $clientId): string
    {
        return "client-{$clientId}-customer";
    }

    //

    private function buildAddress(array $data): array
    {
        $zipCode = $this->sanitizeDigits($data['zip_code'] ?? null);

        $street       = (string) ($data['address'] ?? '');
        $number       = (string) ($data['number'] ?? '0');
        $neighborhood = (string) ($data['district'] ?? '');

        $city    = (string) ($data['city'] ?? '');
        $state   = (string) ($data['state'] ?? '');
        $country = (string) ($data['country'] ?? 'BR');

        $complement = (string) ($data['complement'] ?? '');

        $line1Parts = array_filter([$number, $street, $neighborhood], static fn ($value) => $value !== '');

        $line1 = implode(', ', $line1Parts);
        $line2 = $complement ?: (string) ($data['instructions'] ?? '');

        return [
            'line_1'   => $line1,
            'line_2'   => $line2,
            'zip_code' => $zipCode,
            'city'     => $city,
            'state'    => $state,
            'country'  => $country,
        ];
    }

    private function buildPhones(?string $phone): array
    {
        $digits = $this->sanitizeDigits($phone);

        if (empty($digits)) {
            return [];
        }

        $countryCode = '55';
        $areaCode    = substr($digits, 0, 2);
        $number      = substr($digits, 2);

        if (strlen($digits) <= 2) {
            $areaCode = '';
            $number   = $digits;
        }

        return [
            'mobile_phone' => [
                'country_code' => $countryCode,
                'area_code'    => $areaCode,
                'number'       => $number,
            ],
        ];
    }

    //

    private function documentType(string $document): string
    {
        return strlen($document) === 14 ? 'CNPJ' : 'CPF';
    }

    private function personType(string $document): string
    {
        return strlen($document) === 14 ? 'company' : 'individual';
    }

    private function sanitizeDigits(?string $value): string
    {
        return preg_replace('/\D+/', '', (string) $value) ?? '';
    }

    //

    private function pagarmeRequest(int $clientId)
    {
        $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' => $this->idempotencyKey($clientId),
                'Content-Type'    => 'application/json',
                'Accept'          => 'application/json',
            ]);
    }
}