package service

import (
	"context"
	"encoding/json"
	"fmt"
	v1 "github.com/go-nunu/nunu-layout-advanced/api/v1"
	"github.com/go-nunu/nunu-layout-advanced/internal/repository"
	"github.com/go-nunu/nunu-layout-advanced/pkg/rabbitmq"
	amqp "github.com/rabbitmq/amqp091-go"
	"github.com/spf13/cast"
	"go.uber.org/zap"
	"golang.org/x/net/publicsuffix"
	"net"
	"slices"
	"strconv"
)

type WafFormatterService interface {
	require(ctx context.Context, req v1.GlobalRequire, category string) (v1.GlobalRequire, error)
	sendFormData(ctx context.Context,addTokenUrl string,addSendUrl string,formData map[string]interface{}) (int, error)
	validateWafPortCount(ctx context.Context, hostId int) error
	validateWafDomainCount(ctx context.Context, req v1.GlobalRequire) error
	ConvertToWildcardDomain(ctx context.Context,domain string) (string, error)
	AppendWafIp(ctx context.Context, req []string,returnSourceIp string) ([]v1.IpInfo, error)
	WashIps(ctx context.Context, req []string) ([]string, error)
	PublishIpWhitelistTask(ips []string, action string,returnSourceIp string)
	PublishDomainWhitelistTask(domain, ip, action string)
	findIpDifferences(oldIps, newIps []string) ([]string, []string)
	WashDeleteWafIp(ctx context.Context, backendList []string,allowIpList []string) ([]string, error)
	WashEditWafIp(ctx context.Context, newBackendList []string,newAllowIpList []string,oldBackendList []string,oldAllowIpList []string) ([]string, []string, []string,  []string, error)
	GetIp(ctx context.Context, gatewayGroupId int) ([]string,string, error)
}
func NewWafFormatterService(
    service *Service,
	globalRep repository.GlobalLimitRepository,
	hostRep repository.HostRepository,
	required RequiredService,
	parser ParserService,
	tcpforwardingRep repository.TcpforwardingRepository,
	udpForWardingRep repository.UdpForWardingRepository,
	webForwardingRep repository.WebForwardingRepository,
	mq *rabbitmq.RabbitMQ,
	host HostService,
	gatewayGroupRep repository.GatewayGroupRepository,
	gatewayGroupIpRep repository.GateWayGroupIpRepository,
) WafFormatterService {
	return &wafFormatterService{
		Service:        service,
		globalRep: globalRep,
		hostRep: hostRep,
		required: required,
		parser: parser,
		tcpforwardingRep: tcpforwardingRep,
		udpForWardingRep: udpForWardingRep,
		webForwardingRep: webForwardingRep,
		host : host,
		mq:    mq,
		gatewayGroupRep: gatewayGroupRep,
		gatewayGroupIpRep: gatewayGroupIpRep,
	}
}

type wafFormatterService struct {
	*Service
	globalRep repository.GlobalLimitRepository
	hostRep repository.HostRepository
	required RequiredService
	parser ParserService
	tcpforwardingRep repository.TcpforwardingRepository
	udpForWardingRep repository.UdpForWardingRepository
	webForwardingRep repository.WebForwardingRepository
	host HostService
	mq *rabbitmq.RabbitMQ
	gatewayGroupRep repository.GatewayGroupRepository
	gatewayGroupIpRep repository.GateWayGroupIpRepository
}


func (s *wafFormatterService) require(ctx context.Context,req v1.GlobalRequire,category string) (v1.GlobalRequire, error) {
	RuleIds, err := s.globalRep.GetGlobalLimitByHostId(ctx, int64(req.HostId))
	if err != nil {
		return v1.GlobalRequire{}, err
	}
	req.WafGatewayGroupId = RuleIds.GatewayGroupId
	switch category {
	case "tcp":
		req.LimitRuleId = RuleIds.TcpLimitRuleId
	case "udp":
		req.LimitRuleId = RuleIds.UdpLimitRuleId
	case "web":
		req.LimitRuleId = RuleIds.WebLimitRuleId
	}
	domain, err := s.hostRep.GetDomainById(ctx, req.HostId)
	if err != nil {
		return v1.GlobalRequire{}, err
	}
	req.Tag = strconv.Itoa(req.Uid) + "_" + strconv.Itoa(req.HostId) + "_" + domain + "_" + req.Comment
	return req, nil
}

func (s *wafFormatterService) sendFormData(ctx context.Context,addTokenUrl string,addSendUrl string,formData map[string]interface{}) (int, error) {
	respBody, err := s.required.SendForm(ctx, addTokenUrl, addSendUrl, formData)
	if err != nil {
		return 0, err
	}
	// 解析响应内容中的 alert 消息
	res, err := s.parser.ParseAlert(string(respBody))
	if err != nil {
		return 0,err
	}
	if res != "" {
		return 0,fmt.Errorf(res)
	}
	ruleIdStr, err := s.parser.GetRuleIdByColumnName(ctx, respBody,formData["tag"].(string))
	if err != nil {
		return 0, err
	}
	ruleId, err := cast.ToIntE(ruleIdStr)
	if err != nil {
		return 0,err
	}
	return ruleId, nil
}

func (s *wafFormatterService) validateWafPortCount(ctx context.Context, hostId int) error {
	congfig, err := s.host.GetGlobalLimitConfig(ctx, hostId)
	if err != nil {
		return err
	}
	tcpCount, err := s.tcpforwardingRep.GetTcpForwardingPortCountByHostId(ctx, hostId)
	if err != nil {
		return err
	}
	udpCount, err := s.udpForWardingRep.GetUdpForwardingPortCountByHostId(ctx, hostId)
	if err != nil {
		return err
	}
	webCount, err := s.webForwardingRep.GetWebForwardingPortCountByHostId(ctx, hostId)
	if err != nil {
		return err
	}
	if int64(congfig.PortCount) > tcpCount + udpCount + webCount {
		return nil
	}
	return fmt.Errorf("端口数量超出套餐限制,已配置%d个端口，套餐限制为%d个端口", tcpCount+udpCount+webCount, congfig.PortCount)
}

func (s *wafFormatterService) validateWafDomainCount(ctx context.Context, req v1.GlobalRequire) error {
	congfig, err := s.host.GetGlobalLimitConfig(ctx, req.HostId)
	if err != nil {
		return err
	}
	domainCount, domainSlice, err := s.webForwardingRep.GetWebForwardingDomainCountByHostId(ctx, req.HostId)
	if err != nil {
		return err
	}
	if req.Domain != "" {
		if !slices.Contains(domainSlice, req.Domain) {
			domainCount += 1
			if domainCount > int64(congfig.DomainCount) {
				return fmt.Errorf("域名数量已达到上限,已配置%d个域名，套餐限制为%d个域名", domainCount, congfig.DomainCount)
			}
		}
	}
	return nil
}
func (s *wafFormatterService) ConvertToWildcardDomain(ctx context.Context, domain string) (string, error) {
	// 1. 使用 EffectiveTLDPlusOne 获取可注册域名部分。
	//    例如，对于 "www.google.com"，这将返回 "google.com"。
	//    对于 "a.b.c.tokyo.jp"，这将返回 "c.tokyo.jp"。
	registrableDomain, err := publicsuffix.EffectiveTLDPlusOne(domain)
	if err != nil {
		// 如果域名无效（如 IP 地址、localhost），则返回错误。
		return "", fmt.Errorf("无法处理 '%s': %w", domain, err)
	}

	// 2. 比较原始域名和可注册域名。
	//    如果它们不相等，说明原始域名包含子域名。
	if domain != registrableDomain {
		// 3. 如果存在子域名，则用 "*." 加上可注册域名来构造通配符域名。
		return registrableDomain, nil
	}

	// 4. 如果原始域名和可注册域名相同（例如，输入就是 "google.com"），
	//    则说明没有子域名可替换，直接返回原始域名。
	return domain, nil
}

func (s *wafFormatterService) AppendWafIp(ctx context.Context, req []string,returnSourceIp string) ([]v1.IpInfo, error) {
	var ips []v1.IpInfo
	for _, v := range req {
		ips = append(ips, v1.IpInfo{
			FType:      "0",
			FStartIp:   v,
			FEndIp:     v,
			FRemark:    "宁波高防IP过白",
			FServerIp:  returnSourceIp,
		})
	}
	return ips, nil
}

func (s *wafFormatterService) AppendWafIpByRemovePort(ctx context.Context, req []string) ([]v1.IpInfo, error) {
	var ips []v1.IpInfo
	for _, v := range req {
		ip, _, err := net.SplitHostPort(v)
		if err != nil {
			return nil, err
		}
		ips = append(ips, v1.IpInfo{
			FType:      "0",
			FStartIp:   ip,
			FEndIp:     ip,
			FRemark:    "宁波高防IP过白",
			FServerIp:  "",
		})
	}
	return ips, nil

}

func (s *wafFormatterService) WashIps(ctx context.Context, req []string) ([]string, error) {
	var res []string
	for _, v := range req {
		res = append(res,v)
	}
	return res, nil
}

// publishDomainWhitelistTask is a helper function to publish domain whitelist tasks to RabbitMQ.
// It can handle different actions like "add" or "del".
func (s *wafFormatterService) PublishDomainWhitelistTask(domain, ip, action string) {
	// Define message payload, including the action
	type domainTaskPayload struct {
		Domain string `json:"domain"`
		Ip     string `json:"ip"`
		Action string `json:"action"`
	}
	payload := domainTaskPayload{
		Domain: domain,
		Ip:     ip,
		Action: action,
	}

	// Serialize the message
	msgBody, err := json.Marshal(payload)
	if err != nil {
		s.logger.Error("Failed to serialize domain whitelist task message", zap.Error(err), zap.String("domain", domain), zap.String("ip", ip), zap.String("action", action))
		return
	}

	// Get task configuration
	taskCfg, ok := s.mq.GetTaskConfig("domain_whitelist")
	if !ok {
		s.logger.Error("Failed to get 'domain_whitelist' task configuration")
		return
	}

	// Construct the routing key dynamically based on the action
	routingKey := fmt.Sprintf("whitelist.domain.%s", action)

	// Construct the amqp.Publishing message
	publishingMsg := amqp.Publishing{
		ContentType:  "application/json",
		Body:         msgBody,
		DeliveryMode: amqp.Persistent, // Persistent message
	}

	// Publish the message
	err = s.mq.PublishWithCh(taskCfg.Exchange, routingKey, publishingMsg)
	if err != nil {
		s.logger.Error("发布 域名 白名单任务到 MQ 失败", zap.Error(err), zap.String("domain", domain), zap.String("action", action))
	} else {
		s.logger.Info("成功将 域名 白名单任务发布到 MQ", zap.String("domain", domain), zap.String("action", action))
	}
}


func (s *wafFormatterService) PublishIpWhitelistTask(ips []string, action string, returnSourceIp string) {
	// Define message payload, including the action
	type ipTaskPayload struct {
		Ips     []string `json:"ips"`
		Action string `json:"action"`
		ReturnSourceIp string `json:"return_source_ip"`
	}
	payload := ipTaskPayload{
		Ips:     ips,
		Action: action,
		ReturnSourceIp: returnSourceIp,
	}

	// Serialize the message
	msgBody, err := json.Marshal(payload)
	if err != nil {
		s.logger.Error("序列化 IP 白名单任务消息失败", zap.Error(err), zap.Any("IPs", ips), zap.String("action", action))
		return
	}

	// Get task configuration
	taskCfg, ok := s.mq.GetTaskConfig("ip_white")
	if !ok {
		s.logger.Error("无法获取“ip_white”任务配置")
		return
	}

	// Construct the routing key dynamically based on the action
	routingKey := fmt.Sprintf("task.ip_white.%s", action)

	// Construct the amqp.Publishing message
	publishingMsg := amqp.Publishing{
		ContentType:  "application/json",
		Body:         msgBody,
		DeliveryMode: amqp.Persistent, // Persistent message
	}

	// Publish the message
	err = s.mq.PublishWithCh(taskCfg.Exchange, routingKey, publishingMsg)
	if err != nil {
		s.logger.Error("发布 IP 白名单任务到 MQ 失败", zap.Error(err), zap.String("action", action))
	} else {
		s.logger.Info("成功将 IP 白名单任务发布到 MQ", zap.String("action", action))
	}
}


func (s *wafFormatterService) findIpDifferences(oldIps, newIps []string) ([]string, []string) {
	// 使用 map 实现 set，用于快速查找
	oldIpsSet := make(map[string]struct{}, len(oldIps))
	for _, ip := range oldIps {
		oldIpsSet[ip] = struct{}{}
	}

	newIpsSet := make(map[string]struct{}, len(newIps))
	for _, ip := range newIps {
		newIpsSet[ip] = struct{}{}
	}

	var addedIps []string
	// 查找新增的 IP：存在于 newIpsSet 但不存在于 oldIpsSet
	for ip := range newIpsSet {
		if _, found := oldIpsSet[ip]; !found {
			addedIps = append(addedIps, ip)
		}
	}

	var removedIps []string
	// 查找移除的 IP：存在于 oldIpsSet 但不存在于 newIpsSet
	for ip := range oldIpsSet {
		if _, found := newIpsSet[ip]; !found {
			removedIps = append(removedIps, ip)
		}
	}

	return addedIps, removedIps
}

func (s *wafFormatterService) WashDeleteWafIp(ctx context.Context, backendList []string,allowIpList []string) ([]string, error) {
	var res []string
	for _, v := range backendList {
		ip, _, err := net.SplitHostPort(v)
		if err != nil {
			return nil, err
		}
		res = append(res, ip)
	}
	res = append(res, allowIpList...)
	return res, nil
}

func (s *wafFormatterService) WashEditWafIp(ctx context.Context, newBackendList []string,newAllowIpList []string,oldBackendList []string,oldAllowIpList []string) ([]string, []string, []string, []string, error) {
	var oldIps []string
	var newIps []string
	var oldAllowIps []string
	var newAllowIps []string
	for _, v := range oldBackendList {
		ip, _, err := net.SplitHostPort(v)
		if err != nil {
			return nil, nil, nil, nil, err
		}
		oldIps = append(oldIps, ip)
	}
	if newBackendList != nil {
		for _, v := range newBackendList {
			ip, _, err := net.SplitHostPort(v)
			if err != nil {
				return nil, nil, nil, nil, err
			}
			newIps = append(newIps, ip)
		}
	}
	addedIps, removedIps := s.findIpDifferences(oldIps, newIps)

	if oldAllowIpList != nil {
		oldAllowIps = append(oldAllowIps, oldAllowIpList...)
	}
	if newAllowIpList != nil {
		newAllowIps = append(newAllowIps, newAllowIpList...)
	}
	addedAllowIps, removedAllowIps := s.findIpDifferences(oldAllowIps, newAllowIps)



	return addedIps, removedIps ,addedAllowIps, removedAllowIps, nil
}

func (s *wafFormatterService) GetIp(ctx context.Context, gatewayGroupId int) ([]string,string, error) {
	WafGatewayGroupRuleId, err := s.gatewayGroupRep.GetGatewayGroupByRuleId(ctx, int64(gatewayGroupId))
	if err != nil {
		return nil, "", err
	}
	ips, err := s.gatewayGroupIpRep.GetGateWayGroupAllIpByGatewayGroupId(ctx, WafGatewayGroupRuleId.Id)
	if err != nil {
		return nil, "", err
	}
	if len(ips) == 0 {
		return nil, "", fmt.Errorf("请联系客服分配网关IP")
	}
	return ips,ips[0], nil
}