'use strict';

const Service = require('egg').Service;

/**
 * 短信网关服务（阿里云 Dysmsapi）
 *
 * 仅负责把"服务端已生成的验证码"下发给手机号，不参与验证码的存证与校验
 * （校验仍由 ctx.session 在 auth 控制器中完成，契约见 verify_sms_and_import_lock 测试）。
 *
 * 依赖 SDK（生产环境需 npm install）：
 *   @alicloud/openapi-client
 *   @alicloud/dysmsapi20170525
 *   @alicloud/tea-util
 */
class SmsService extends Service {
  /**
   * 发送短信验证码
   * @param {string} phone - 接收短信的手机号
   * @param {string} code  - 6 位验证码（由调用方生成并存入 session）
   * @returns {Promise<{ok:boolean, message:string}>}
   */
  async sendVerifyCode(phone, code) {
    const { ctx, app } = this;
    const cfg = app.config.sms && app.config.sms.aliyun;
    if (!cfg || !cfg.accessKeyId || !cfg.accessKeySecret) {
      ctx.logger.error('[短信网关] 未配置阿里云密钥，无法发送');
      return { ok: false, message: '短信网关未配置' };
    }

    let OpenApi;
    let Dysmsapi;
    let Util;
    try {
      OpenApi = require('@alicloud/openapi-client');
      Dysmsapi = require('@alicloud/dysmsapi20170525');
      Util = require('@alicloud/tea-util');
    } catch (e) {
      ctx.logger.error('[短信网关] 未安装阿里云 SDK：' + e.message);
      return { ok: false, message: '短信网关 SDK 未安装' };
    }

    try {
      const config = new OpenApi.Config({
        accessKeyId: cfg.accessKeyId,
        accessKeySecret: cfg.accessKeySecret,
        endpoint: cfg.endpoint,
      });
      const client = new Dysmsapi.default(config);

      const request = new Dysmsapi.SendSmsRequest({
        phoneNumbers: String(phone),
        signName: cfg.signName,
        templateCode: cfg.templateCode,
        templateParam: JSON.stringify({ code: String(code) }),
      });

      const runtime = new Util.RuntimeOptions({});
      runtime.readTimeout = 5000;
      runtime.connectTimeout = 5000;

      const response = await client.sendSmsWithOptions(request, runtime);
      const body = response && response.body;
      if (body && body.code === 'OK') {
        ctx.logger.info(`[短信网关] 验证码已下发至 ${phone}`);
        return { ok: true, message: '验证码发送成功' };
      }
      const reason = (body && (body.message || body.code)) || '未知错误';
      ctx.logger.error(`[短信网关] 下发失败：${reason}`);
      return { ok: false, message: reason };
    } catch (err) {
      ctx.logger.error('[短信网关] 调用异常：' + (err && err.message));
      return { ok: false, message: (err && err.message) || '短信网关调用异常' };
    }
  }
}

module.exports = SmsService;