<?php

namespace App\Services\Sms;

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

class TencentCloudSmsSender implements SmsSender
{
    private const ACTION = 'SendSms';
    private const VERSION = '2021-01-11';
    private const SERVICE = 'sms';
    private const ALGORITHM = 'TC3-HMAC-SHA256';

    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 = (string) config('sms.tencentcloud.endpoint');
        $region = (string) config('sms.tencentcloud.region');
        $secretId = (string) config('sms.tencentcloud.secret_id');
        $secretKey = (string) config('sms.tencentcloud.secret_key');
        $timeout = (int) config('sms.timeout', 5);

        $payload = [
            'PhoneNumberSet' => ['+86'.$record->mobile],
            'SmsSdkAppId' => (string) config('sms.tencentcloud.sdk_app_id'),
            'SignName' => (string) config('sms.tencentcloud.sign_name'),
            'TemplateId' => (string) config('sms.tencentcloud.template_id'),
            'TemplateParamSet' => [
                (string) $record->code,
                (string) data_get($record->request_payload_json, 'ttl_minutes', '5'),
            ],
        ];

        $body = json_encode($payload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
        if ($body === false) {
            return SmsSendResult::failure(
                SmsVerification::PROVIDER_TENCENTCLOUD,
                null,
                'PAYLOAD_ENCODE_FAILED',
                'Tencent Cloud SMS payload encode failed.',
                ['error' => 'payload_encode_failed']
            );
        }

        $timestamp = time();
        $headers = $this->buildHeaders($endpoint, $region, $secretId, $secretKey, $timestamp, $body);

        try {
            $response = Http::timeout($timeout)
                ->withHeaders($headers)
                ->withBody($body, 'application/json; charset=utf-8')
                ->post('https://'.$endpoint);
        } catch (\Throwable $e) {
            return SmsSendResult::failure(
                SmsVerification::PROVIDER_TENCENTCLOUD,
                null,
                'NETWORK_ERROR',
                $e->getMessage(),
                ['error' => 'network_error']
            );
        }

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

        $tencentResponse = data_get($json, 'Response', []);
        $requestId = data_get($tencentResponse, 'RequestId');

        if (data_get($tencentResponse, 'Error.Code')) {
            return SmsSendResult::failure(
                SmsVerification::PROVIDER_TENCENTCLOUD,
                is_string($requestId) ? $requestId : null,
                (string) data_get($tencentResponse, 'Error.Code'),
                (string) data_get($tencentResponse, 'Error.Message'),
                $this->responseSummary($json)
            );
        }

        $status = data_get($tencentResponse, 'SendStatusSet.0', []);
        $providerCode = (string) data_get($status, 'Code', '');
        $providerMessage = (string) data_get($status, 'Message', '');

        if ($response->successful() && $providerCode === 'Ok') {
            return SmsSendResult::success(
                SmsVerification::PROVIDER_TENCENTCLOUD,
                is_string($requestId) ? $requestId : null,
                $providerCode,
                $providerMessage,
                $this->responseSummary($json)
            );
        }

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

    /**
     * @return array<string, string>
     */
    private function buildHeaders(
        string $host,
        string $region,
        string $secretId,
        string $secretKey,
        int $timestamp,
        string $payload,
    ): array {
        $date = gmdate('Y-m-d', $timestamp);
        $canonicalHeaders = "content-type:application/json; charset=utf-8\nhost:{$host}\n";
        $signedHeaders = 'content-type;host';
        $canonicalRequest = implode("\n", [
            'POST',
            '/',
            '',
            $canonicalHeaders,
            $signedHeaders,
            hash('sha256', $payload),
        ]);

        $credentialScope = $date.'/'.self::SERVICE.'/tc3_request';
        $stringToSign = implode("\n", [
            self::ALGORITHM,
            (string) $timestamp,
            $credentialScope,
            hash('sha256', $canonicalRequest),
        ]);

        $secretDate = hash_hmac('sha256', $date, 'TC3'.$secretKey, true);
        $secretService = hash_hmac('sha256', self::SERVICE, $secretDate, true);
        $secretSigning = hash_hmac('sha256', 'tc3_request', $secretService, true);
        $signature = hash_hmac('sha256', $stringToSign, $secretSigning);

        $authorization = self::ALGORITHM
            .' Credential='.$secretId.'/'.$credentialScope
            .', SignedHeaders='.$signedHeaders
            .', Signature='.$signature;

        return [
            'Authorization' => $authorization,
            'Content-Type' => 'application/json; charset=utf-8',
            'Host' => $host,
            'X-TC-Action' => self::ACTION,
            'X-TC-Region' => $region,
            'X-TC-Timestamp' => (string) $timestamp,
            'X-TC-Version' => self::VERSION,
        ];
    }

    /**
     * @param  array<string, mixed>  $response
     * @return array<string, mixed>
     */
    private function responseSummary(array $response): array
    {
        return [
            'request_id' => data_get($response, 'Response.RequestId'),
            'error' => data_get($response, 'Response.Error'),
            'send_status_set' => data_get($response, 'Response.SendStatusSet'),
        ];
    }
}