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"
	"golang.org/x/sync/errgroup"
	"net"
	"sort"
	"strconv"
	"strings"
)

type TcpforwardingService interface {
	GetTcpforwarding(ctx context.Context, req v1.GetForwardingRequest) (v1.TcpForwardingDataRequest, error)
	AddTcpForwarding(ctx context.Context, req *v1.TcpForwardingRequest)  error
	EditTcpForwarding(ctx context.Context, req *v1.TcpForwardingRequest)  error
	DeleteTcpForwarding(ctx context.Context, req v1.DeleteTcpForwardingRequest) error
	GetTcpForwardingAllIpsByHostId(ctx context.Context, req v1.GetForwardingRequest) ([]v1.TcpForwardingDataRequest, error)
}

func NewTcpforwardingService(
	service *Service,
	tcpforwardingRepository repository.TcpforwardingRepository,
	parser ParserService,
	required RequiredService,
	crawler CrawlerService,
	globalRep repository.GlobalLimitRepository,
	hostRep repository.HostRepository,
	wafformatter WafFormatterService,
) TcpforwardingService {
	return &tcpforwardingService{
		Service:                 service,
		tcpforwardingRepository: tcpforwardingRepository,
		parser:                  parser,
		required:                required,
		crawler:                 crawler,
		globalRep:               globalRep,
		hostRep:                 hostRep,
		wafformatter:            wafformatter,
	}
}

type tcpforwardingService struct {
	*Service
	tcpforwardingRepository repository.TcpforwardingRepository
	parser                  ParserService
	required                RequiredService
	crawler                 CrawlerService
	globalRep               repository.GlobalLimitRepository
	hostRep      repository.HostRepository
	wafformatter WafFormatterService
}

func (s *tcpforwardingService) GetTcpforwarding(ctx context.Context, req v1.GetForwardingRequest) (v1.TcpForwardingDataRequest, error) {
	var tcpForwarding model.Tcpforwarding
	var backend model.TcpForwardingRule
	var err error

	g, gCtx := errgroup.WithContext(ctx)
	g.Go(func() error {
		res, e := s.tcpforwardingRepository.GetTcpforwarding(gCtx, int64(req.Id))
		if e != nil {
			return fmt.Errorf("GetTcpforwarding failed: %w", e)
		}
		if res != nil {
			tcpForwarding = *res
		}
		return nil
	})

	g.Go(func() error {
		res, e := s.tcpforwardingRepository.GetTcpForwardingIpsByID(gCtx, req.Id)
		if e != nil {
			return fmt.Errorf("GetTcpforwardingIps failed: %w", e)
		}
		if res != nil {
			backend = *res
		}
		return nil
	})
	if err = g.Wait(); err != nil {
		return v1.TcpForwardingDataRequest{}, err
	}

	return v1.TcpForwardingDataRequest{
		Id:               tcpForwarding.Id,
		WafTcpId:         tcpForwarding.WafTcpId,
		Tag:              tcpForwarding.Tag,
		Port:             tcpForwarding.Port,
		Comment:          tcpForwarding.Comment,
		WafGatewayGroupId: tcpForwarding.WafGatewayGroupId,
		WafTcpLimitRuleId: tcpForwarding.TcpLimitRuleId,
		CcCount:           tcpForwarding.CcCount,
		CcDuration:        tcpForwarding.CcDuration,
		CcBlockCount:      tcpForwarding.CcBlockCount,
		CcBlockDuration:   tcpForwarding.CcBlockDuration,
		BackendProtocol:   tcpForwarding.BackendProtocol,
		BackendTimeout:    tcpForwarding.BackendTimeout,
		BackendList:       backend.BackendList,
		AllowIpList:       backend.AllowIpList,
		DenyIpList:        backend.DenyIpList,
		AccessRule:        backend.AccessRule,
	}, nil
}

func (s *tcpforwardingService) require(ctx context.Context,req v1.GlobalRequire) (v1.GlobalRequire, error) {
	res, err := s.wafformatter.require(ctx, req, "tcp")
	if err != nil {
		return v1.GlobalRequire{}, err
	}
	return res, nil
}

func (s *tcpforwardingService) buildWafFormData(req *v1.TcpForwardingDataSend, require v1.GlobalRequire) map[string]interface{} {
	return map[string]interface{}{
		"waf_tcp_id":           req.WafTcpId,
		"tag":                  require.Tag,
		"port":                 req.Port,
		"waf_gateway_group_id": require.WafGatewayGroupId,
		"waf_tcp_limit_id": 	require.LimitRuleId,
		"cc_count":             req.CcCount,
		"cc_duration":          req.CcDuration,
		"cc_block_count":       req.CcBlockCount,
		"cc_block_duration":    req.CcBlockDuration,
		"backend_protocol":     req.BackendProtocol,
		"backend_timeout":      req.BackendTimeout,
		"comment":              req.Comment,
		"backend_list":         req.BackendList,
		"allow_ip_list":        req.AllowIpList,
		"deny_ip_list":         req.DenyIpList,
		"access_rule":          req.AccessRule,
	}
}

func (s *tcpforwardingService) buildTcpForwardingModel(req *v1.TcpForwardingDataRequest, ruleId int, require v1.GlobalRequire) *model.Tcpforwarding {
	return &model.Tcpforwarding{
		HostId:  require.HostId,
		WafTcpId: ruleId,
		Port:    req.Port,
		Tag:     require.Tag,
		Comment: req.Comment,
		TcpLimitRuleId: require.LimitRuleId,
		WafGatewayGroupId: require.WafGatewayGroupId,
		CcCount: req.CcCount,
		CcDuration: req.CcDuration,
		CcBlockCount: req.CcBlockCount,
		CcBlockDuration: req.CcBlockDuration,
		BackendProtocol: req.BackendProtocol,
		BackendTimeout: req.BackendTimeout,
	}
}

func (s *tcpforwardingService) buildTcpRuleModel(reqData *v1.TcpForwardingDataRequest, require v1.GlobalRequire, localDbId int) *model.TcpForwardingRule {
	return &model.TcpForwardingRule{
		Uid:         require.Uid,
		HostId:      require.HostId,
		TcpId:       localDbId, // 关联到本地数据库的主记录 ID
		BackendList: reqData.BackendList,
		AllowIpList: reqData.AllowIpList,
		DenyIpList:  reqData.DenyIpList,
		AccessRule:  reqData.AccessRule,
	}
}

func (s *tcpforwardingService) prepareWafData(ctx context.Context, req *v1.TcpForwardingRequest) (v1.GlobalRequire, map[string]interface{}, error) {
	// 1. 获取必要的全局信息
	require, err := s.require(ctx, v1.GlobalRequire{
		HostId:  req.HostId,
		Uid:     req.Uid,
		Comment: req.TcpForwardingData.Comment,
	})
	if err != nil {
		return v1.GlobalRequire{}, nil, err
	}
	if require.WafGatewayGroupId == 0 || require.LimitRuleId == 0 {
		return v1.GlobalRequire{}, nil, fmt.Errorf("请先配置实例")
	}
	// 2. 将字符串切片拼接成字符串，用于 WAF API
	backendListStr := strings.Join(req.TcpForwardingData.BackendList, "\n")
	allowIpListStr := strings.Join(req.TcpForwardingData.AllowIpList, "\n")
	denyIpListStr := strings.Join(req.TcpForwardingData.DenyIpList, "\n")

	// 3. 创建用于构建 WAF 表单的数据结构
	formDataBase := v1.TcpForwardingDataSend{
		Tag:               require.Tag,
		WafTcpId:          req.TcpForwardingData.WafTcpId,
		WafGatewayGroupId: require.WafGatewayGroupId,
		WafTcpLimitRuleId: require.LimitRuleId,
		Port:              req.TcpForwardingData.Port,
		CcCount:           req.TcpForwardingData.CcCount,
		CcDuration:        req.TcpForwardingData.CcDuration,
		CcBlockCount:      req.TcpForwardingData.CcBlockCount,
		CcBlockDuration:   req.TcpForwardingData.CcBlockDuration,
		BackendProtocol:   req.TcpForwardingData.BackendProtocol,
		BackendTimeout:    req.TcpForwardingData.BackendTimeout,
		BackendList:       backendListStr,
		AllowIpList:       allowIpListStr,
		DenyIpList:        denyIpListStr,
		AccessRule:        req.TcpForwardingData.AccessRule,
		Comment:           req.TcpForwardingData.Comment,
	}

	// 4. 构建 WAF 表单数据映射
	formData := s.buildWafFormData(&formDataBase, require)

	return require, formData, nil
}

func (s *tcpforwardingService) AddTcpForwarding(ctx context.Context, req *v1.TcpForwardingRequest)  error {
	require, formData, err := s.prepareWafData(ctx, req)
	if err != nil {
		return err
	}
	err = s.wafformatter.validateWafPortCount(ctx, require.HostId)
	if err != nil {
		return err
	}
	wafTcpId, err := s.wafformatter.sendFormData(ctx, "admin/info/waf_tcp/new", "admin/new/waf_tcp", formData)
	if err != nil {
		return err
	}

	// 异步任务：将IP添加到白名单
	var ips []string
	if req.TcpForwardingData.BackendList != nil {
		for _, v := range req.TcpForwardingData.BackendList {
			ip, _, err := net.SplitHostPort(v)
			if err != nil {
				return err
			}
			ips = append(ips, ip)
		}
		ips = append(ips, req.TcpForwardingData.AllowIpList...)
		go s.wafformatter.PublishIpWhitelistTask(ips, "add")
	}

	tcpModel := s.buildTcpForwardingModel(&req.TcpForwardingData, wafTcpId, require)

	id, err := s.tcpforwardingRepository.AddTcpforwarding(ctx, tcpModel)
	if err != nil {
		return  err
	}
	TcpRuleModel := s.buildTcpRuleModel(&req.TcpForwardingData, require, id)
	if _, err = s.tcpforwardingRepository.AddTcpforwardingIps(ctx, *TcpRuleModel); err != nil {
		return err
	}
	return  nil
}

func (s *tcpforwardingService) EditTcpForwarding(ctx context.Context, req *v1.TcpForwardingRequest) error {
	WafTcpId, err := s.tcpforwardingRepository.GetTcpforwardingWafTcpIdById(ctx, req.TcpForwardingData.Id)
	if err != nil {
		return  err
	}
	req.TcpForwardingData.WafTcpId = WafTcpId
	require, formData, err := s.prepareWafData(ctx, req)
	if err != nil {
		return  err
	}
	_, err = s.wafformatter.sendFormData(ctx, "admin/info/waf_tcp/edit?&__goadmin_edit_pk="+strconv.Itoa(req.TcpForwardingData.WafTcpId), "admin/edit/waf_tcp", formData)
	if err != nil {
		return err
	}

	// 异步任务：将IP添加到白名单
	ipData, err := s.tcpforwardingRepository.GetTcpForwardingIpsByID(ctx, req.TcpForwardingData.Id)
	if err != nil {
		return err
	}
	addedIps, removedIps, err := s.wafformatter.WashEditWafIp(ctx,req.TcpForwardingData.BackendList,req.TcpForwardingData.AllowIpList,ipData.BackendList,ipData.AllowIpList)
	if err != nil {
		return err
	}
	if len(addedIps) > 0 {
		go s.wafformatter.PublishIpWhitelistTask(addedIps, "add")
	}
	if len(removedIps) > 0 {
		go s.wafformatter.PublishIpWhitelistTask(removedIps, "del")
	}

	tcpModel := s.buildTcpForwardingModel(&req.TcpForwardingData, req.TcpForwardingData.WafTcpId, require)
	tcpModel.Id = req.TcpForwardingData.Id
	if err = s.tcpforwardingRepository.EditTcpforwarding(ctx, tcpModel); err != nil {
		return  err
	}
	TcpRuleModel := s.buildTcpRuleModel(&req.TcpForwardingData, require, req.TcpForwardingData.Id)
	if err = s.tcpforwardingRepository.EditTcpforwardingIps(ctx, *TcpRuleModel); err != nil {
		return err
	}
	return  nil
}

func (s *tcpforwardingService) DeleteTcpForwarding(ctx context.Context, req v1.DeleteTcpForwardingRequest)  error {
	for _, Id := range req.Ids {
		wafTcpId, err := s.tcpforwardingRepository.GetTcpforwardingWafTcpIdById(ctx, Id)
		if err != nil {
			return  err
		}

		_, err = s.crawler.DeleteRule(ctx, wafTcpId, "admin/delete/waf_tcp?page=1&__pageSize=1000000&__sort=waf_tcp_id&__sort_type=desc")
		if err != nil {
			return err
		}


		// 删除白名单
		var ips []string
		ipData, err := s.tcpforwardingRepository.GetTcpForwardingIpsByID(ctx, Id)
		if err != nil {
			return err
		}
		ips, err = s.wafformatter.WashDeleteWafIp(ctx, ipData.BackendList, ipData.AllowIpList)
		if err != nil {
			return err
		}
		if len(ips) > 0 {
			go s.wafformatter.PublishIpWhitelistTask(ips, "del")
		}


		if err = s.tcpforwardingRepository.DeleteTcpforwarding(ctx, int64(Id)); err != nil {
			return  err
		}

		if err = s.tcpforwardingRepository.DeleteTcpForwardingIpsById(ctx, Id); err != nil {
			return  err
		}
	}
	return  nil
}

func (s *tcpforwardingService) GetTcpForwardingAllIpsByHostId(ctx context.Context, req v1.GetForwardingRequest) ([]v1.TcpForwardingDataRequest, error) {
	type CombinedResult struct {
		Id          int
		Forwarding  *model.Tcpforwarding
		BackendRule *model.TcpForwardingRule
		Err         error // 如果此ID的处理出错，则携带错误
	}
	g,gCtx := errgroup.WithContext(ctx)
	ids, err := s.tcpforwardingRepository.GetTcpForwardingAllIdsByID(gCtx, req.HostId)
	if err != nil {
		return nil, fmt.Errorf("GetTcpForwardingAllIds failed: %w", err)
	}
	if len(ids) == 0 {
		return nil, nil
	}
	resChan := make(chan CombinedResult, len(ids))
	g.Go(func() error {
		for _, idVal := range ids {
			currentID := idVal
			g.Go(func() error {
				var wf *model.Tcpforwarding
				var bk *model.TcpForwardingRule
				var localErr error
				wf, localErr = s.tcpforwardingRepository.GetTcpforwarding(gCtx, int64(currentID))
				if localErr != nil {
					resChan <- CombinedResult{Id: currentID, Err: localErr}
					return localErr
				}
				bk, localErr = s.tcpforwardingRepository.GetTcpForwardingIpsByID(gCtx, currentID)
				if localErr != nil {
					resChan <- CombinedResult{Id: currentID, Err: localErr}
					return localErr
				}
				resChan <- CombinedResult{Id: currentID, Forwarding: wf, BackendRule: bk}
				return nil
			})
		}
		return nil
	})
	groupErr := g.Wait()
	close(resChan)
	if groupErr != nil {
		return nil, groupErr
	}
	res := make([]v1.TcpForwardingDataRequest, 0, len(ids))
	for r := range resChan {
		if r.Err != nil {
			return nil, fmt.Errorf("received error from goroutine for ID %d: %w", r.Id, r.Err)
		}
		if r.Forwarding == nil {
			return nil,fmt.Errorf("received nil forwarding from goroutine for ID %d", r.Id)
		}

		dataReq := v1.TcpForwardingDataRequest{
			Id: r.Forwarding.Id,
			Port: r.Forwarding.Port,
			CcCount: r.Forwarding.CcCount,
			CcDuration: r.Forwarding.CcDuration,
			CcBlockCount: r.Forwarding.CcBlockCount,
			CcBlockDuration: r.Forwarding.CcBlockDuration,
			BackendProtocol: r.Forwarding.BackendProtocol,
			BackendTimeout: r.Forwarding.BackendTimeout,
			Comment: r.Forwarding.Comment,

		}
		if r.BackendRule != nil {
			dataReq.BackendList = r.BackendRule.BackendList
			dataReq.AllowIpList = r.BackendRule.AllowIpList
			dataReq.DenyIpList = r.BackendRule.DenyIpList
			dataReq.AccessRule = r.BackendRule.AccessRule
		}
		res = append(res, dataReq)
	}

	sort.Slice(res, func(i, j int) bool {
		return res[i].Id > res[j].Id
	})
	return res, nil

}