package auth

import (
	"context"
	"fmt"
	openapi "github.com/alibabacloud-go/darabonba-openapi/v2/client"
	dysmsapi "github.com/alibabacloud-go/dysmsapi-20170525/v3/client"
	"github.com/alibabacloud-go/tea-utils/v2/service"
	"github.com/alibabacloud-go/tea/tea"
	"github.com/zeromicro/go-zero/core/logx"
	"tianyuan-api/apps/gateway/internal/svc"
	"tianyuan-api/apps/gateway/internal/types"
	"math/rand"
	"time"
)

type GetVerifyCodeLogic struct {
	logx.Logger
	ctx    context.Context
	svcCtx *svc.ServiceContext
}

func NewGetVerifyCodeLogic(ctx context.Context, svcCtx *svc.ServiceContext) *GetVerifyCodeLogic {
	return &GetVerifyCodeLogic{
		Logger: logx.WithContext(ctx),
		ctx:    ctx,
		svcCtx: svcCtx,
	}
}

func (l *GetVerifyCodeLogic) GetVerifyCode(req *types.GetVerifyCodeReq) (err error) {
	// 校验 actionType 参数的值是否为 "login" 或 "register"
	if req.ActionType != "login" && req.ActionType != "register" {
		return fmt.Errorf("action_type 参数只能是 'login' 或 'register'")
	}
	// 检查手机号是否在一分钟内已发送过验证码
	redisKey := fmt.Sprintf("%s:%s", req.ActionType, req.Phone)
	exists, err := l.svcCtx.Redis.Exists(redisKey)
	if err != nil {
		return err
	}

	if exists {
		// 如果 Redis 中已经存在标记，说明在 1 分钟内请求过，返回错误
		return fmt.Errorf("一分钟内不能重复发送验证码")
	}
	// 生成随机验证码
	code := fmt.Sprintf("%06d", rand.New(rand.NewSource(time.Now().UnixNano())).Intn(1000000))

	// 调用阿里云短信服务发送验证码
	client, err := l.CreateClient()
	if err != nil {
		return err
	}

	sendSmsRequest := &dysmsapi.SendSmsRequest{
		SignName:      tea.String(l.svcCtx.Config.VerifyCode.SignName),
		TemplateCode:  tea.String(l.svcCtx.Config.VerifyCode.TemplateCode),
		PhoneNumbers:  tea.String(req.Phone),
		TemplateParam: tea.String(fmt.Sprintf("{\"code\":\"%s\"}", code)),
	}

	runtime := &service.RuntimeOptions{}
	// 这里使用 *dysmsapi.SendSmsResponse 接收返回值
	smsResp, err := client.SendSmsWithOptions(sendSmsRequest, runtime)
	if err != nil {
		return err
	}

	if *smsResp.Body.Code != "OK" {
		return fmt.Errorf("短信发送失败: %s", *smsResp.Body.Message)
	}
	// 将验证码保存到 Redis，设置过期时间
	err = l.svcCtx.Redis.Setex(req.Phone, code, l.svcCtx.Config.VerifyCode.ValidTime) // 验证码有效期5分钟
	if err != nil {
		return err
	}
	// 在 Redis 中设置 1 分钟的标记，限制重复请求
	err = l.svcCtx.Redis.Setex(redisKey, code, 60) // 标记 1 分钟内不能重复请求
	if err != nil {
		return err
	}
	// 构建返回给前端的响应
	return nil
}

// 创建阿里云短信客户端
func (l *GetVerifyCodeLogic) CreateClient() (*dysmsapi.Client, error) {
	config := &openapi.Config{
		AccessKeyId:     &l.svcCtx.Config.VerifyCode.AccessKeyID,
		AccessKeySecret: &l.svcCtx.Config.VerifyCode.AccessKeySecret,
	}
	config.Endpoint = tea.String(l.svcCtx.Config.VerifyCode.EndpointURL)
	return dysmsapi.NewClient(config)
}