package web

import (
	"context"
	"encoding/json"
	"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/api/waf"
	"github.com/go-nunu/nunu-layout-advanced/internal/service"
	"github.com/go-nunu/nunu-layout-advanced/internal/service/api/flexCdn"
	waf2 "github.com/go-nunu/nunu-layout-advanced/internal/service/api/waf"
	"github.com/go-nunu/nunu-layout-advanced/internal/service/api/waf/common"
)

// AidedWebService Web转发辅助服务接口
type AidedWebServiceInterface interface {
	// 数据准备辅助函数
	PrepareWafData(ctx context.Context, req *v1.WebForwardingRequest) (common.RequireResponse, v1.Website, error)
	BuildProxyConfig(ctx context.Context, req *v1.WebForwardingRequest, gatewayIps []string) (v1.TypeJSON, error)
	BulidFormData(ctx context.Context, formData v1.Website) (v1.WebsiteSend, error)

	// 协议判断辅助函数
	GetProtocolType(isHttps int) string
	IsHttpsProtocol(isHttps int) bool

	// 模型构建辅助函数
	BuildWebForwardingModel(req *v1.WebForwardingDataRequest, ruleId int, require common.RequireResponse) *model.WebForwarding
	BuildWebRuleModel(reqData *v1.WebForwardingDataRequest, require common.RequireResponse, localDbId int, cdnOriginIds map[string]int64) *model.WebForwardingRule

}

func NewAidedWebService(
	service *service.Service,
	webForwardingRepository waf.WebForwardingRepository,
	wafformatter common.WafFormatterService,
	sslCert flexCdn.SslCertService,
	cdn flexCdn.CdnService,
	proxy flexCdn.ProxyService,
	websocket flexCdn.WebsocketService,
	cc waf2.CcService,
	ccIpList waf2.CcIpListService,
	gatewayIp common.GatewayipService,
	globalLimitRep waf.GlobalLimitRepository,
) *AidedWebService {
	return &AidedWebService{
		Service:                 service,
		webForwardingRepository: webForwardingRepository,
		wafformatter:            wafformatter,
		sslCert:                 sslCert,
		cdn:                     cdn,
		proxy:                   proxy,
		websocket:               websocket,
		cc:                      cc,
		ccIpList:                ccIpList,
		gatewayIp:               gatewayIp,
		globalLimitRep:          globalLimitRep,
	}
}

type AidedWebService struct {
	*service.Service
	webForwardingRepository waf.WebForwardingRepository
	wafformatter            common.WafFormatterService
	sslCert                 flexCdn.SslCertService
	cdn                     flexCdn.CdnService
	proxy                   flexCdn.ProxyService
	websocket      flexCdn.WebsocketService
	cc             waf2.CcService
	ccIpList       waf2.CcIpListService
	gatewayIp      common.GatewayipService
	globalLimitRep waf.GlobalLimitRepository
}

const (
	// 协议类型常量
	isHttps       = 1
	isHttp        = 0
	protocolHttps = "https"
	protocolHttp  = "http"

	// 默认配置常量
	defaultNodeClusterId = 2
	proxyProtocolVersion = 1
)



// BuildWebForwardingModel 辅助函数，用于构建通用的 WebForwarding 模型
// ruleId 是从 WAF 系统获取的 ID
func (s *AidedWebService) BuildWebForwardingModel(req *v1.WebForwardingDataRequest, ruleId int, require common.RequireResponse) *model.WebForwarding {
	return &model.WebForwarding{
		HostId:          require.HostId,
		CdnWebId:        ruleId,
		Port:            req.Port,
		Domain:          req.Domain,
		IsHttps:         req.IsHttps,
		Comment:         req.Comment,
		HttpsCert:       req.HttpsCert,
		HttpsKey:        req.HttpsKey,
		SslCertId:       int(req.SslCertId),
		SslPolicyId:     int(req.SslPolicyId),
		Cc:              req.CcConfig.IsOn,
		ThresholdMethod: req.CcConfig.ThresholdMethod,
		Level:           req.CcConfig.Level,
		Limit5s:         req.CcConfig.Limit5s,
		Limit60s:        req.CcConfig.Limit60s,
		Limit300s:       req.CcConfig.Limit300s,
		Proxy:           req.Proxy,
	}
}

// BuildWebRuleModel 构建WebForwardingRule模型
func (s *AidedWebService) BuildWebRuleModel(reqData *v1.WebForwardingDataRequest, require common.RequireResponse, localDbId int, cdnOriginIds map[string]int64) *model.WebForwardingRule {
	return &model.WebForwardingRule{
		Uid:          require.Uid,
		HostId:       require.HostId,
		WebId:        localDbId,
		CdnOriginIds: cdnOriginIds,
		BackendList:  reqData.BackendList,
	}
}

// getRequire 获取前置配置
func (s *AidedWebService) getRequire (ctx context.Context, req *v1.WebForwardingRequest) (common.RequireResponse, error) {
	// 1. 获取基础配置
	require, err := s.wafformatter.Require(ctx, v1.GlobalRequire{
		HostId:  req.HostId,
		Uid:     req.Uid,
		Comment: req.WebForwardingData.Comment,
	})
	if err != nil {
		return common.RequireResponse{},  fmt.Errorf("获取WAF前置配置失败: %w", err)
	}
	if require.Uid == 0 {
		return common.RequireResponse{},  fmt.Errorf("请先配置实例")
	}

	return require, nil

}

// PrepareWafData 准备WAF数据
// 职责：协调整个流程，负责获取前置配置和组装最终的 formData。
func (s *AidedWebService) PrepareWafData(ctx context.Context, req *v1.WebForwardingRequest) (common.RequireResponse, v1.Website, error) {

	// 1. 获取前置配置
	require, err := s.getRequire(ctx, req)
	if err != nil {
		return common.RequireResponse{}, v1.Website{}, err
	}

	// 2. 调用辅助函数，构建核心的代理配置 (将复杂逻辑封装起来)
	byteData, err := s.BuildProxyConfig(ctx, req, require.GatewayIps)
	if err != nil {
		return common.RequireResponse{}, v1.Website{}, err // 错误信息在辅助函数中已经包装好了
	}


	type serverNames struct {
		ServerNames string `json:"name" form:"name"`
		Type        string `json:"type" form:"type"`
	}
	var serverName []serverNames
	var serverJson []byte
	if req.WebForwardingData.Domain != "" {
		serverName = append(serverName, serverNames{
			ServerNames: req.WebForwardingData.Domain,
			Type:        "full",
		})
		serverJson, err = json.Marshal(serverName)
		if err != nil {
			return common.RequireResponse{}, v1.Website{}, err
		}
	}

	// 3. 组装最终的 WAF 表单数据
	formData := v1.Website{
		UserId:          int64(require.CdnUid),
		Type:            "httpProxy",
		Name:            require.Tag,
		ServerNamesJSON: serverJson,
		Description:     req.WebForwardingData.Comment,
		ServerGroupIds:  []int64{int64(require.GroupId)},
		NodeClusterId:   defaultNodeClusterId,
	}

	// 4. 根据协议类型，填充 HttpJSON 和 HttpsJSON 字段
	if req.WebForwardingData.IsHttps == isHttps {
		formData.HttpJSON = v1.TypeJSON{IsOn: false}
		formData.HttpsJSON = byteData
	} else {
		formData.HttpJSON = byteData
		formData.HttpsJSON = v1.TypeJSON{IsOn: false}
	}

	return require, formData, nil
}


func (s *AidedWebService) buildSslPolicy(ctx context.Context, data *v1.WebForwardingDataRequest) (v1.SslPolicyRef, error) {
	// 如果不是 HTTPS，直接返回关闭状态的 SSL 策略
	if data.IsHttps != isHttps {
		return v1.SslPolicyRef{
			IsOn:        false,
			SslPolicyId: data.SslPolicyId,
		}, nil
	}

	// --- 以下是 HTTPS 的逻辑 ---
	sslPolicyID := data.SslPolicyId
	// 如果请求中没有提供 SSL 策略 ID，则为其创建一个新的
	if sslPolicyID == 0 {
		var err error
		sslPolicyID, err = s.sslCert.AddSslPolicy(ctx, nil)
		if err != nil {
			// 如果创建失败，返回零值和错误
			return v1.SslPolicyRef{}, err
		}
	}

	// 返回开启状态的 HTTPS 策略
	return v1.SslPolicyRef{
		IsOn:        true,
		SslPolicyId: sslPolicyID,
	}, nil
}

// BuildProxyConfig 构建代理配置
// 职责：专门负责处理 HTTP/HTTPS 的差异，并生成对应的 JSON 配置。
func (s *AidedWebService) BuildProxyConfig(ctx context.Context, req *v1.WebForwardingRequest, gatewayIps []string) (v1.TypeJSON, error) {
	// 第一步：构建 SSL 策略。所有复杂的 if/else 都被封装在辅助函数中
	sslPolicy, err := s.buildSslPolicy(ctx, &req.WebForwardingData)
	if err != nil {
		return v1.TypeJSON{}, err
	}

	// 更新请求中的 SSL 策略
	req.WebForwardingData.SslPolicyId = sslPolicy.SslPolicyId

	// 第二步：根据协议类型确定 apiType
	apiType := protocolHttp
	if req.WebForwardingData.IsHttps == isHttps {
		apiType = protocolHttps
	}

	// 第三步：构建通用的 Listen 配置
	listenConfigs := make([]v1.Listen, 0, len(gatewayIps))
	for _, ip := range gatewayIps {
		listenConfigs = append(listenConfigs, v1.Listen{
			Protocol: apiType,
			Host:     ip,
			Port:     req.WebForwardingData.Port,
		})
	}

	// 第四步：组装并返回最终结果
	jsonData := v1.TypeJSON{
		IsOn:         true,
		SslPolicyRef: sslPolicy,
		Listen:       listenConfigs,
	}



	return jsonData, nil
}




// BulidFormData 构建表单数据
func (s *AidedWebService) BulidFormData(ctx context.Context, formData v1.Website) (v1.WebsiteSend, error) {
	httpJSON, err := json.Marshal(formData.HttpJSON)
	if err != nil {
		return v1.WebsiteSend{}, err
	}
	httpsJSON, err := json.Marshal(formData.HttpsJSON)
	if err != nil {
		return v1.WebsiteSend{}, err
	}
	formDataSend := v1.WebsiteSend{
		UserId:           formData.UserId,
		AdminId:          formData.AdminId,
		Type:             formData.Type,
		Name:             formData.Name,
		Description:      formData.Description,
		ServerNamesJSON:  formData.ServerNamesJSON,
		HttpJSON:         httpJSON,
		HttpsJSON:        httpsJSON,
		TcpJSON:          formData.TcpJSON,
		TlsJSON:          formData.TlsJSON,
		UdpJSON:          formData.UdpJSON,
		WebId:            formData.WebId,
		ReverseProxyJSON: formData.ReverseProxyJSON,
		ServerGroupIds:   formData.ServerGroupIds,
		UserPlanId:       formData.UserPlanId,
		NodeClusterId:    formData.NodeClusterId,
		IncludeNodesJSON: formData.IncludeNodesJSON,
		ExcludeNodesJSON: formData.ExcludeNodesJSON,
	}
	return formDataSend, nil
}






// GetProtocolType 获取协议类型字符串
func (s *AidedWebService) GetProtocolType(isHttps int) string {
	if s.IsHttpsProtocol(isHttps) {
		return protocolHttps
	}
	return protocolHttp
}

// IsHttpsProtocol 判断是否为HTTPS协议
func (s *AidedWebService) IsHttpsProtocol(httpsFlag int) bool {
	return httpsFlag == isHttps
}













// updateWebsiteProtocolAndCert 更新网站协议和证书
func (s *AidedWebService) updateWebsiteProtocolAndCert(ctx context.Context, isHttps int, cdnWebId int64,  formData v1.Website) error {


	// 切换协议
	var typeConfig, closeConfig v1.TypeJSON
	var apiType, closeType string

	if s.IsHttpsProtocol(isHttps) {
		typeConfig = formData.HttpsJSON
		closeConfig = formData.HttpJSON
		apiType = s.GetProtocolType(isHttps)
		closeType = s.GetProtocolType(0) // HTTP
	} else {
		typeConfig = formData.HttpJSON
		closeConfig = formData.HttpsJSON
		apiType = s.GetProtocolType(isHttps)
		closeType = s.GetProtocolType(1) // HTTPS
	}

	typeJson, err := json.Marshal(typeConfig)
	if err != nil {
		return fmt.Errorf("序列化协议配置失败: %w", err)
	}
	closeJson, err := json.Marshal(closeConfig)
	if err != nil {
		return fmt.Errorf("序列化关闭协议配置失败: %w", err)
	}

	// 切换协议
	if err := s.cdn.EditServerType(ctx, v1.EditWebsite{
		Id:       cdnWebId,
		TypeJSON: typeJson,
	}, apiType); err != nil {
		return fmt.Errorf("切换到%s协议失败: %w", apiType, err)
	}

	if err := s.cdn.EditServerType(ctx, v1.EditWebsite{
		Id:       cdnWebId,
		TypeJSON: closeJson,
	}, closeType); err != nil {
		return fmt.Errorf("关闭%s协议失败: %w", closeType, err)
	}

	return nil
}

// updateWebsiteDomain 更新网站域名
func (s *AidedWebService) updateWebsiteDomain(ctx context.Context, domain string, cdnWebId int64) error {
	type serverName struct {
		Name string `json:"name" form:"name"`
		Type string `json:"type" form:"type"`
	}
	var serverData []serverName
	serverData = append(serverData, serverName{
		Name: domain,
		Type: "full",
	})
	serverJson, err := json.Marshal(serverData)
	if err != nil {
		return fmt.Errorf("序列化服务器名称失败: %w", err)
	}

	if err := s.cdn.EditServerName(ctx, v1.EditServerNames{
		ServerId:        cdnWebId,
		ServerNamesJSON: serverJson,
	}); err != nil {
		return fmt.Errorf("更新服务器名称失败: %w", err)
	}

	return nil
}

// updateWebsiteBasicInfo 更新网站基本信息
func (s *AidedWebService) updateWebsiteBasicInfo(ctx context.Context, cdnWebId int64, tag string) error {
	// 通过globalLimitRep获取节点ID，这是项目中现有的方法
	nodeId, err := s.globalLimitRep.GetNodeId(ctx, int(cdnWebId))
	if err != nil {
		return fmt.Errorf("获取节点ID失败: %w", err)
	}

	if err := s.cdn.EditServerBasic(ctx, cdnWebId, tag, nodeId); err != nil {
		return fmt.Errorf("更新服务器基本信息失败: %w", err)
	}

	return nil
}