package service

import (
	"context"
	"fmt"
	v1 "github.com/go-nunu/nunu-layout-advanced/api/v1"
	"github.com/go-nunu/nunu-layout-advanced/internal/model"
	"github.com/go-nunu/nunu-layout-advanced/internal/repository"
	"github.com/spf13/cast"
	"github.com/spf13/viper"
	"strconv"
	"sync"

	"github.com/sourcegraph/conc"
)

type GlobalLimitService interface {
	GetGlobalLimit(ctx context.Context, id int64) (*model.GlobalLimit, error)
	AddGlobalLimit(ctx context.Context, req v1.GlobalLimitRequest) error
	EditGlobalLimit(ctx context.Context, req v1.GlobalLimitRequest) error
	DeleteGlobalLimit(ctx context.Context, req v1.GlobalLimitRequest) error
}

func NewGlobalLimitService(
	service *Service,
	globalLimitRepository repository.GlobalLimitRepository,
	duedate DuedateService,
	crawler CrawlerService,
	conf *viper.Viper,
	required RequiredService,
	parser ParserService,
	host HostService,
	tcpLimit TcpLimitService,
	udpLimit UdpLimitService,
	webLimit WebLimitService,
	gateWayGroup GatewayGroupService,
	hostRep repository.HostRepository,
) GlobalLimitService {
	return &globalLimitService{
		Service:               service,
		globalLimitRepository: globalLimitRepository,
		duedate:               duedate,
		crawler:               crawler,
		Url:                   conf.GetString("crawler.Url"),
		required:              required,
		parser:                parser,
		host:                  host,
		tcpLimit:              tcpLimit,
		udpLimit:              udpLimit,
		webLimit:              webLimit,
		gateWayGroup:          gateWayGroup,
		hostRep:                hostRep,
	}
}

type globalLimitService struct {
	*Service
	globalLimitRepository repository.GlobalLimitRepository
	duedate               DuedateService
	crawler               CrawlerService
	Url                   string
	required              RequiredService
	parser                ParserService
	host                  HostService
	tcpLimit              TcpLimitService
	udpLimit              UdpLimitService
	webLimit              WebLimitService
	gateWayGroup          GatewayGroupService
	hostRep               repository.HostRepository
}

func (s *globalLimitService) GlobalLimitRequire(ctx context.Context, req v1.GlobalLimitRequest) (res v1.GlobalLimitRequireResponse, err error) {
	isExist, err := s.globalLimitRepository.IsGlobalLimitExistByHostId(ctx, int64(req.HostId))
	if err != nil {
		return v1.GlobalLimitRequireResponse{}, err
	}
	if isExist {
		return v1.GlobalLimitRequireResponse{}, fmt.Errorf("配置限制已存在")
	}
	res.ExpiredAt, err = s.duedate.NextDueDate(ctx, req.Uid, req.HostId)
	if err != nil {
		return v1.GlobalLimitRequireResponse{}, err
	}
	configCount, err := s.host.GetGlobalLimitConfig(ctx, req.HostId)
	if err != nil {
		return v1.GlobalLimitRequireResponse{}, fmt.Errorf("获取配置限制失败: %w", err)
	}

	res.Bps = configCount.Bps
	res.MaxBytesMonth = configCount.MaxBytesMonth
	domain, err := s.hostRep.GetDomainById(ctx, req.HostId)
	if err != nil {
		return v1.GlobalLimitRequireResponse{}, err
	}
	res.GlobalLimitName = strconv.Itoa(req.Uid) + "_" + strconv.Itoa(req.HostId) + "_" + domain
	return res, nil
}

func (s *globalLimitService) GetGlobalLimit(ctx context.Context, id int64) (*model.GlobalLimit, error) {
	return s.globalLimitRepository.GetGlobalLimit(ctx, id)
}

func (s *globalLimitService) AddGlobalLimit(ctx context.Context, req v1.GlobalLimitRequest) error {
	require, err := s.GlobalLimitRequire(ctx, req)
	if err != nil {
		return err
	}
	formData := map[string]interface{}{
		"tag":             require.GlobalLimitName,
		"bps":             require.Bps,
		"max_bytes_month": require.MaxBytesMonth,
		"expired_at":      require.ExpiredAt,
	}
	respBody, err := s.required.SendForm(ctx, "admin/info/waf_common_limit/new", "admin/new/waf_common_limit", formData)
	if err != nil {
		return err
	}
	ruleIdBase, err := s.parser.GetRuleIdByColumnName(ctx, respBody, require.GlobalLimitName)
	if err != nil {
		return err
	}
	if ruleIdBase == "" {
		res, err := s.parser.ParseAlert(string(respBody))
		if err != nil {
			return err
		}
		return fmt.Errorf(res)
	}
	ruleId, err := cast.ToIntE(ruleIdBase)
	if err != nil {
		return err
	}
	// 使用conc库并发执行API调用
	var tcpLimitRuleId, udpLimitRuleId, webLimitRuleId int
	var mu sync.Mutex // 用于保护共享变量

	// 为每个并发调用创建独立的请求参数（深拷贝）
	// 避免共享同一个指针可能导致的数据竞争


	// 创建一个WaitGroup来协调多个并发任务
	wg := conc.NewWaitGroup()

	// 启动tcpLimit调用 - 使用独立的请求参数副本
	wg.Go(func() {
		// 为该goroutine创建独立的请求参数副本
		tcpLimitReq := &v1.GeneralLimitRequireRequest{
			Tag:    require.GlobalLimitName,
			HostId: req.HostId,
			RuleId: ruleId,
			Uid:    req.Uid,
		}
		result, e := s.tcpLimit.AddTcpLimit(ctx, tcpLimitReq)
		if e != nil {
			// 只在修改共享的错误变量时加锁
			mu.Lock()
			err = e
			mu.Unlock()
		} else {
			// 不需要加锁，因为tcpLimitRuleId只被这一个goroutine修改
			tcpLimitRuleId = result
		}
	})

	// 启动udpLimit调用 - 使用独立的请求参数副本
	wg.Go(func() {
		// 为该goroutine创建独立的请求参数副本
		udpLimitReq := &v1.GeneralLimitRequireRequest{
			Tag:    require.GlobalLimitName,
			HostId: req.HostId,
			RuleId: ruleId,
			Uid:    req.Uid,
		}
		result, e := s.udpLimit.AddUdpLimit(ctx, udpLimitReq)
		if e != nil {
			// 只在修改共享的错误变量时加锁
			mu.Lock()
			err = e
			mu.Unlock()
		} else {
			// 不需要加锁，因为udpLimitRuleId只被这一个goroutine修改
			udpLimitRuleId = result
		}
	})

	// 启动webLimit调用 - 使用独立的请求参数副本
	wg.Go(func() {
		// 为该goroutine创建独立的请求参数副本
		webLimitReq := &v1.GeneralLimitRequireRequest{
			Tag:    require.GlobalLimitName,
			HostId: req.HostId,
			RuleId: ruleId,
			Uid:    req.Uid,
		}
		result, e := s.webLimit.AddWebLimit(ctx, webLimitReq)
		if e != nil {
			// 只在修改共享的错误变量时加锁
			mu.Lock()
			err = e
			mu.Unlock()
		} else {
			// 不需要加锁，因为webLimitRuleId只被这一个goroutine修改
			webLimitRuleId = result
		}
	})

	// 等待所有调用完成
	wg.Wait()

	// 检查是否有错误发生
	if err != nil {
		return err
	}
	err = s.globalLimitRepository.AddGlobalLimit(ctx, &model.GlobalLimit{
		HostId:          req.HostId,
		RuleId:          cast.ToInt(ruleId),
		GlobalLimitName: require.GlobalLimitName,
		Comment:         req.Comment,
		TcpLimitRuleId:  tcpLimitRuleId,
		UdpLimitRuleId:  udpLimitRuleId,
		WebLimitRuleId:  webLimitRuleId,
		GatewayGroupId:  5,
	})
	if err != nil {
		return err
	}
	return nil
}

func (s *globalLimitService) EditGlobalLimit(ctx context.Context, req v1.GlobalLimitRequest) error {
	if err := s.globalLimitRepository.UpdateGlobalLimitByHostId(ctx, &model.GlobalLimit{
		HostId:  req.HostId,
		Comment: req.Comment,
	}); err != nil {
		return err
	}
	return nil
}

func (s *globalLimitService) DeleteGlobalLimit(ctx context.Context, req v1.GlobalLimitRequest) error {
	if err := s.globalLimitRepository.DeleteGlobalLimitByHostId(ctx, int64(req.HostId)); err != nil {
		return err
	}
	return nil
}