<?php

namespace App\Services\Sms;

use App\Models\SmsVerification;
use App\Support\SmsConfig;
use Illuminate\Support\Facades\Http;

class TencentCloudSmsSender implements SmsSender
{
    public function sendVerification(SmsVerification $record): SmsSendResult
    {
        try {
            SmsConfig::assertReadyForRealSending();
        } catch (\Throwable $e) {
            return SmsSendResult::failure(
                SmsVerification::PROVIDER_TENCENTCLOUD,
                null,
                'CONFIG_INCOMPLETE',
                $e->getMessage(),
                ['error' => 'config_incomplete']
            );
        }

        $endpoint = rtrim((string) config('sms.tencentcloud.endpoint'), '?&');
        $sdkAppId = (string) config('sms.tencentcloud.sdk_app_id');
        $appKey = (string) config('sms.tencentcloud.app_key');
        $timeout = (int) config('sms.timeout', 5);
        $random = (string) random_int(100000, 999999999);
        $timestamp = time();
        $mobile = (string) $record->mobile;

        $payload = [
            'ext' => '',
            'extend' => '',
            'params' => [
                (string) $record->code,
                (string) data_get($record->request_payload_json, 'ttl_minutes', '5'),
            ],
            'sig' => hash(
                'sha256',
                "appkey={$appKey}&random={$random}&time={$timestamp}&mobile={$mobile}"
            ),
            'sign' => (string) config('sms.tencentcloud.sign_name'),
            'tel' => [
                'mobile' => $mobile,
                'nationcode' => '86',
            ],
            'time' => $timestamp,
            'tpl_id' => (int) config('sms.tencentcloud.template_id'),
        ];

        $url = $endpoint.'?'.http_build_query([
            'sdkappid' => $sdkAppId,
            'random' => $random,
        ], '', '&', PHP_QUERY_RFC3986);

        try {
            $response = Http::timeout($timeout)
                ->acceptJson()
                ->asJson()
                ->post($url, $payload);
        } catch (\Throwable $e) {
            return SmsSendResult::failure(
                SmsVerification::PROVIDER_TENCENTCLOUD,
                null,
                'NETWORK_ERROR',
                'Tencent Cloud SMS request failed: '.$e->getMessage(),
                ['error' => 'network_error', 'exception' => $e::class]
            );
        }

        $json = $response->json();
        if (! $response->successful()) {
            $responseSummary = is_array($json)
                ? $this->responseSummary($json, $response->status())
                : ['http_status' => $response->status(), 'error' => 'http_error'];
            $providerMessage = is_array($json) && isset($json['errmsg']) && is_scalar($json['errmsg'])
                ? (string) $json['errmsg']
                : 'Tencent Cloud SMS returned HTTP '.$response->status().'.';

            return SmsSendResult::failure(
                SmsVerification::PROVIDER_TENCENTCLOUD,
                is_array($json) ? $this->requestId($json) : null,
                'HTTP_'.$response->status(),
                $providerMessage,
                $responseSummary
            );
        }

        if (! is_array($json)) {
            return SmsSendResult::failure(
                SmsVerification::PROVIDER_TENCENTCLOUD,
                null,
                'INVALID_JSON_RESPONSE',
                'Tencent Cloud SMS returned invalid JSON.',
                ['error' => 'invalid_json_response', 'http_status' => $response->status()]
            );
        }

        $rawResult = $json['result'] ?? null;
        if (! is_int($rawResult) && (! is_string($rawResult) || preg_match('/^-?\d+$/', $rawResult) !== 1)) {
            return SmsSendResult::failure(
                SmsVerification::PROVIDER_TENCENTCLOUD,
                $this->requestId($json),
                'PROTOCOL_ERROR',
                'Tencent Cloud SMS response is missing an integer result field.',
                $this->responseSummary($json, $response->status())
            );
        }

        $result = (int) $rawResult;
        $requestId = $this->requestId($json);
        $providerCode = (string) $result;
        $providerMessage = isset($json['errmsg']) && is_scalar($json['errmsg'])
            ? (string) $json['errmsg']
            : '';

        if ($result === 0) {
            return SmsSendResult::success(
                SmsVerification::PROVIDER_TENCENTCLOUD,
                $requestId,
                $providerCode,
                $providerMessage,
                $this->responseSummary($json, $response->status())
            );
        }

        return SmsSendResult::failure(
            SmsVerification::PROVIDER_TENCENTCLOUD,
            $requestId,
            $providerCode,
            $providerMessage !== '' ? $providerMessage : 'Tencent Cloud SMS send failed.',
            $this->responseSummary($json, $response->status())
        );
    }

    /** @param array<string, mixed> $response */
    private function requestId(array $response): ?string
    {
        $sid = $response['sid'] ?? null;

        return is_string($sid) || is_numeric($sid) ? (string) $sid : null;
    }

    /**
     * @param  array<string, mixed>  $response
     * @return array<string, mixed>
     */
    private function responseSummary(array $response, int $httpStatus): array
    {
        return [
            'http_status' => $httpStatus,
            'result' => $response['result'] ?? null,
            'errmsg' => $response['errmsg'] ?? null,
            'sid' => $response['sid'] ?? null,
            'fee' => $response['fee'] ?? null,
            'ext' => $response['ext'] ?? null,
        ];
    }
}