package sms

import (
	"context"
	"time"

	"bsm/full/module/base/sender/internal/excode"
	"bsm/full/module/base/sender/internal/impl"
	pb "bsm/full/module/base/sender/pb"
	"git.apinb.com/bsm-sdk/core/errcode"
)

func Verify(ctx context.Context, in *pb.SmsVerifyRequest) (reply *pb.SmsReply, err error) {
	if in.GetCode() == "" {
		return nil, excode.ErrCode
	}

	if in.GetPhone() == "" {
		return nil, excode.ErrPhone
	}

	//check redis
	key := KeyPrefix + in.GetPhone()
	code, err := impl.RedisService.Client.Get(impl.RedisService.Ctx, key).Result()
	if err != nil {
		return nil, errcode.NewError(1311, err.Error())
	}
	//check code
	if code == in.Code {
		// 校验成功：删除验证码与失败计数，验证码一次性使用，避免重放
		failKey := VerifyFailCacheKey + in.GetPhone()
		impl.RedisService.Client.Del(impl.RedisService.Ctx, key)
		impl.RedisService.Client.Del(impl.RedisService.Ctx, failKey)
		return &pb.SmsReply{
			Reply: "true",
		}, nil
	}

	// 校验失败：累计连续失败次数，达到上限后验证码作废，避免暴力枚举
	failKey := VerifyFailCacheKey + in.GetPhone()
	count := impl.RedisService.Client.Incr(impl.RedisService.Ctx, failKey).Val()
	if count == 1 {
		ttl := impl.RedisService.Client.TTL(impl.RedisService.Ctx, key).Val()
		if ttl <= 0 {
			ttl = 300 * time.Second
		}
		impl.RedisService.Client.Expire(impl.RedisService.Ctx, failKey, ttl)
	}
	if count >= MaxVerifyFail {
		impl.RedisService.Client.Del(impl.RedisService.Ctx, key)
		impl.RedisService.Client.Del(impl.RedisService.Ctx, failKey)
		return nil, excode.ErrCodeVerifyTooMany
	}

	return &pb.SmsReply{
		Reply: "false",
	}, nil
}