<?php

namespace App\Services;

use App\Models\SystemConfig;
use Illuminate\Support\Facades\Cache;

class SmsService
{
    /**
     * 发送验证码
     */
    public function sendCode(string $phone, string $type = 'login', int $expireMinutes = 5): array
    {
        $config = $this->getConfig();

        if (!$config['enabled']) {
            return ['success' => false, 'message' => '短信服务未启用'];
        }

        // 生成6位验证码
        $code = str_pad((string) random_int(0, 999999), 6, '0', STR_PAD_LEFT);

        // 存储验证码
        $cacheKey = "sms_code:{$phone}:{$type}";
        Cache::put($cacheKey, [
            'code' => $code,
            'expires_at' => now()->addMinutes($expireMinutes)->timestamp,
        ], now()->addMinutes($expireMinutes + 5));

        // 调用阿里云短信
        if ($config['driver'] === 'aliyun') {
            return $this->sendAliyunSms($phone, $code, $type, $config);
        }

        // 模拟模式（开发环境）
        \Log::info("SMS Code [{$type}] for {$phone}: {$code}");

        return [
            'success' => true,
            'message' => '验证码已发送（模拟模式）',
            'data' => ['code' => $code], // 开发环境返回验证码
        ];
    }

    /**
     * 验证验证码
     */
    public function verifyCode(string $phone, string $code, string $type = 'login'): bool
    {
        $cacheKey = "sms_code:{$phone}:{$type}";
        $data = Cache::get($cacheKey);

        if (!$data) {
            return false;
        }

        if ($data['expires_at'] < now()->timestamp) {
            Cache::forget($cacheKey);
            return false;
        }

        if ($data['code'] !== $code) {
            return false;
        }

        // 验证成功后删除
        Cache::forget($cacheKey);

        return true;
    }

    /**
     * 获取短信配置
     */
    public function getConfig(): array
    {
        $cacheKey = 'sms_service_config';

        return Cache::remember($cacheKey, 3600, function () {
            return [
                'enabled' => SystemConfig::getValue('sms', 'enabled', false),
                'driver' => SystemConfig::getValue('sms', 'driver', 'aliyun'),
                'access_key_id' => SystemConfig::getValue('sms', 'access_key_id', ''),
                'access_key_secret' => SystemConfig::getValue('sms', 'access_key_secret', ''),
                'sign_name' => SystemConfig::getValue('sms', 'sign_name', ''),
                'template_codes' => SystemConfig::getValue('sms', 'template_codes', []),
            ];
        });
    }

    /**
     * 阿里云短信发送
     */
    private function sendAliyunSms(string $phone, string $code, string $type, array $config): array
    {
        $templateCode = $this->getTemplateCode($type, $config['template_codes']);

        if (!$templateCode) {
            return ['success' => false, 'message' => '未配置短信模板'];
        }

        try {
            $params = [
                'PhoneNumbers' => $phone,
                'SignName' => $config['sign_name'],
                'TemplateCode' => $templateCode,
                'TemplateParam' => json_encode(['code' => $code]),
            ];

            // 阿里云 OpenAPI 签名
            $signResult = $this->aliyunSign($config['access_key_id'], $config['access_key_secret'], $params);

            $response = \Illuminate\Support\Facades\Http::withHeaders([
                'Content-Type' => 'application/x-www-form-urlencoded',
            ])->asForm()->post('https://dysmsapi.aliyuncs.com/', array_merge($params, $signResult));

            $result = $response->json();

            if (($result['Code'] ?? '') === 'OK') {
                return ['success' => true, 'message' => '发送成功'];
            }

            return ['success' => false, 'message' => $result['Message'] ?? '发送失败'];
        } catch (\Exception $e) {
            \Log::error('阿里云短信发送失败: ' . $e->getMessage());
            return ['success' => false, 'message' => '短信发送失败'];
        }
    }

    /**
     * 获取模板代码
     */
    private function getTemplateCode(string $type, array $templates): ?string
    {
        $map = [
            'login' => $templates['login'] ?? null,
            'reset_password' => $templates['reset_password'] ?? $templates['reset'] ?? null,
            'pair' => $templates['pair'] ?? $templates['login'] ?? null,
        ];

        return $map[$type] ?? null;
    }

    /**
     * 阿里云 API 签名
     */
    private function aliyunSign(string $accessKeyId, string $accessKeySecret, array $params): array
    {
        $params['AccessKeyId'] = $accessKeyId;
        $params['Format'] = 'JSON';
        $params['SignatureMethod'] = 'HMAC-SHA1';
        $params['SignatureVersion'] = '1.0';
        $params['SignatureNonce'] = uniqid();
        $params['Timestamp'] = gmdate('Y-m-d\TH:i:s\Z');
        $params['Version'] = '2017-05-25';

        ksort($params);
        $stringToSign = 'POST&%2F&' . urlencode(http_build_query($params, '', '&', PHP_QUERY_RFC3986));

        $signature = base64_encode(
            hash_hmac('sha1', $stringToSign, $accessKeySecret . '&', true)
        );

        $params['Signature'] = $signature;

        return $params;
    }
}