<?php

namespace App\Support;

use RuntimeException;

class SmsConfig
{
    /**
     * Tencent Cloud SendSms uses Cloud API 3.0 authentication. SmsSdkAppId is
     * a business parameter, not an API credential.
     *
     * @return array<string, string>
     */
    public static function realSendingRequiredEnv(): array
    {
        return [
            'sms.tencentcloud.endpoint' => 'TENCENT_SMS_ENDPOINT',
            'sms.tencentcloud.region' => 'TENCENT_SMS_REGION',
            'sms.tencentcloud.secret_id' => 'TENCENTCLOUD_SECRET_ID',
            'sms.tencentcloud.secret_key' => 'TENCENTCLOUD_SECRET_KEY',
            'sms.tencentcloud.sdk_app_id' => 'TENCENT_SMS_SDK_APP_ID',
            'sms.tencentcloud.sign_name' => 'TENCENT_SMS_SIGN_NAME',
            'sms.tencentcloud.template_id' => 'TENCENT_SMS_TEMPLATE_ID',
        ];
    }

    public static function assertReadyForRealSending(): void
    {
        if (! (bool) config('sms.enabled')) {
            return;
        }

        if ((string) config('sms.driver') !== 'tencentcloud') {
            throw new RuntimeException('SMS_ENABLED=true requires SMS_DRIVER=tencentcloud.');
        }

        $missing = [];
        foreach (self::realSendingRequiredEnv() as $configKey => $envName) {
            $value = config($configKey);
            if ($value === null || trim((string) $value) === '') {
                $missing[] = $envName;
            }
        }

        if ((int) config('sms.tencentcloud.template_param_count') !== 2) {
            $missing[] = 'TENCENT_SMS_TEMPLATE_PARAM_COUNT must be 2';
        }

        if ($missing !== []) {
            throw new RuntimeException(
                'SMS_ENABLED=true but Tencent Cloud SMS configuration is incomplete. '
                .'SendSms uses Cloud API 3.0 and requires CAM credentials. Missing or invalid: '
                .implode(', ', $missing)
            );
        }
    }
}