package smsser

import (
	"context"
	"fmt"
	"strconv"
	"strings"
	"time"

	"91porn-server/app/appg"
	"91porn-server/common"
	"91porn-server/common/constant"
	"91porn-server/common/constant/redisconst"
	"91porn-server/common/log"
	"91porn-server/common/maths"
	"91porn-server/common/redis"
	"91porn-server/common/sms"
	"91porn-server/common/stderr"
	v10 "91porn-server/common/v10"
	"91porn-server/common/ysphone"
	"91porn-server/models/v/usermod"
)

type smsCaptchaLimitRule struct {
	window   time.Duration
	maxCount int64
}

var smsCaptchaLimitRules = []smsCaptchaLimitRule{
	{window: time.Minute, maxCount: redisconst.MobileCaptchaMaxCountInMinute},
	{window: time.Hour, maxCount: redisconst.MobileCaptchaMaxCountInHour},
	{window: 24 * time.Hour, maxCount: redisconst.MobileCaptchaMaxCountInDay},
}

func SendSmsCode(ctx context.Context, mobile string, typ int) stderr.Code {
	mobile = strings.TrimSpace(mobile)
	mobile = ysphone.FormatPhoneNumber(mobile)
	if !v10.IsGlobalizationPhoneNumber(mobile) {
		return stderr.ErrMobileInvalid
	}
	//如果发送的验证码 用户手机绑定 则先校验 当前手机号是否被绑定
	if typ == 1 {
		//手机号是否绑定
		if user, _ := usermod.FindUserByMobile(mobile); user != nil {
			return stderr.ErrMobileHasBindByOther
		}
	}

	// 限制同一手机号在 1 分钟/1 小时/24 小时内的发送次数，使用滑动窗口统计。
	rateCode := checkAndRecordSMSCaptchaRate(ctx, mobile)
	if rateCode != stderr.Success {
		return rateCode
	}

	redisKey := redisconst.MobileCaptchaKey(mobile)
	redisCode, err := appg.Redis.Get(redisKey)
	if err != nil {
		log.ErrorX(ctx, "SendCaptcha redis get err", log.Any("mobile", mobile), log.E(err))
		return stderr.ErrNetWorkBusy
	}
	var code string
	if redisCode != nil {
		code = *redisCode
	} else {
		code = maths.RandDigits(constant.CaptchaLen)
	}
	if err = appg.Redis.Set(redisKey, code, redisconst.MobileCaptchaExpire); err != nil {
		log.ErrorX(ctx, "SendCaptcha Save Redis error", log.Any("mobile", mobile), log.E(err))
		return stderr.ErrNetWorkBusy
	}
	common.Go(func() {
		err = sms.Send(sms.FengNiao, mobile, code)
		if err != nil {
			log.ErrorX(ctx, "SendCaptcha send err", log.Any("mobile", mobile), log.Any("Platform", sms.FengNiao),
				log.E(err))
			yunErr := sms.Send(sms.YunPian, mobile, code)
			if yunErr != nil {
				log.ErrorX(ctx, "SendCaptcha send err", log.Any("mobile", mobile), log.Any("Platform", sms.YunPian),
					log.E(err))
			}
		}
	})
	return stderr.Success
}

func checkAndRecordSMSCaptchaRate(ctx context.Context, mobile string) stderr.Code {
	rateKey := redisconst.SMSCaptchaPhoneNumberKey(mobile)
	for retry := 0; retry < 2; retry++ {
		ret, err := checkAndRecordSMSCaptchaRateOnce(rateKey)
		if err == nil {
			return ret
		}
		if retry == 0 && isRedisWrongTypeError(err) {
			_, _ = appg.Redis.Del(rateKey)
			continue
		}
		log.ErrorX(ctx, "checkAndRecordSMSCaptchaRate failed", log.Any("mobile", mobile), log.E(err))
		return stderr.ErrNetWorkBusy
	}
	return stderr.ErrNetWorkBusy
}

func checkAndRecordSMSCaptchaRateOnce(rateKey string) (stderr.Code, error) {
	now := time.Now().Unix()
	dayWindowSec := int64((24 * time.Hour) / time.Second)

	// 先清理 24 小时窗口外的数据，避免集合无界增长。
	_, err := appg.Redis.ZRemRangeByScore(rateKey, "-inf", strconv.FormatInt(now-dayWindowSec, 10))
	if err != nil {
		return stderr.ErrNetWorkBusy, err
	}

	for _, rule := range smsCaptchaLimitRules {
		windowSec := int64(rule.window / time.Second)
		start := strconv.FormatInt(now-windowSec+1, 10)
		end := strconv.FormatInt(now, 10)
		cnt, countErr := appg.Redis.ZCount(rateKey, start, end)
		if countErr != nil {
			return stderr.ErrNetWorkBusy, countErr
		}
		if cnt >= rule.maxCount {
			return stderr.VisitLimit, nil
		}
	}

	member := fmt.Sprintf("%d:%d", now, time.Now().UnixNano())
	_, err = appg.Redis.ZAdd(rateKey, redis.Member{Score: float64(now), Member: member})
	if err != nil {
		return stderr.ErrNetWorkBusy, err
	}
	_, err = appg.Redis.ExpireKey(rateKey, 25*time.Hour)
	if err != nil {
		return stderr.ErrNetWorkBusy, err
	}
	return stderr.Success, nil
}

func isRedisWrongTypeError(err error) bool {
	return err != nil && strings.Contains(err.Error(), "WRONGTYPE")
}

func VerifySmsCode(mobile string, code string) stderr.Code {
	mobile = strings.TrimSpace(mobile)
	if strings.HasPrefix(mobile, "+86122") { // pass the test mobile
		log.Info("VerifySmsCode dismiss test mobile", log.Any("mobile", mobile))
		return stderr.Success
	}
	if !v10.IsGlobalizationPhoneNumber(mobile) {
		return stderr.ErrMobileInvalid
	}
	mobile = ysphone.FormatPhoneNumber(mobile)
	redisKey := redisconst.MobileCaptchaKey(mobile)
	redisCode, err := appg.Redis.Get(redisKey)
	if err != nil {
		log.Error("VerifySmsCode redis get err", log.Any("mobile", mobile), log.E(err))
		return stderr.ErrNetWorkBusy
	}
	if redisCode != nil && *redisCode == code {
		log.Info("VerifySmsCode check correct", log.Any("mobile", mobile), log.Any("code", code), log.Any("redisCode", redisCode))
		return stderr.Success
	}
	if redisCode == nil {
		log.Info("VerifySmsCode miss", log.Any("mobile", mobile), log.Any("code", code), log.Any("redisCode", redisCode))
		return stderr.ErrCaptcha
	}
	log.Info("VerifySmsCode invalid", log.Any("mobile", mobile), log.Any("code", code), log.Any("redisCode", redisCode))
	return stderr.ErrCaptchaInvalid
}