package admin

import (
	"encoding/json"
	"fmt"
	"github.com/go-nunu/nunu-layout-advanced/internal/service"
	"github.com/tidwall/gjson"
	"go.uber.org/zap"
	"strconv"
	"strings"
)

// --- 1. 集中化字段路径配置 ---

// FieldPathConfig 定义了提取一个特定字段所需的所有信息
type FieldPathConfig struct {
	// Paths 是一个优先级列表，解析器会从前到后尝试这些路径
	Paths []string
	// FieldType 指示字段的预期类型，用于特殊处理（如'array_object', 'array_string', 'bool'）
	FieldType string
}

// apiFieldMappings 是驱动整个解析逻辑的核心配置
// Key: API名称的关键字 (e.g., "web", "tcp", "allowAndDeny")
// Value: 一个映射，定义了该API类型下需要提取的各个字段及其查找路径
var apiFieldMappings = map[string]map[string]FieldPathConfig{
	"web": {
		"Comment":     {Paths: []string{"comment", "data.comment", "desc"}},
		"Port":        {Paths: []string{"port", "data.port"}},
		"Domain":      {Paths: []string{"domain", "data.domain", "host"}},
		"IsHttps":     {Paths: []string{"isHttps", "data.isHttps"}},
		"RuleID":      {Paths: []string{"ruleId", "data.ruleId", "ids", "data.ids"}, FieldType: "array_int"},
		"BackendList": {Paths: []string{"backendList", "data.backendList", "backends"}, FieldType: "array_object"},
	},
	"tcp": {
		"Comment":         {Paths: []string{"comment", "data.comment", "desc"}},
		"Port":            {Paths: []string{"port", "data.port"}},
		"RuleID":          {Paths: []string{"ruleId", "data.ruleId", "ids", "data.ids"}, FieldType: "array_int"},
		"AddrBackendList": {Paths: []string{"addrBackendList", "data.addrBackendList"}, FieldType: "array_string"},
	},
	"udp": { // UDP 和 TCP 结构类似
		"Comment":         {Paths: []string{"comment", "data.comment", "desc"}},
		"Port":            {Paths: []string{"port", "data.port"}},
		"RuleID":          {Paths: []string{"ruleId", "data.ruleId", "ids", "data.ids"}, FieldType: "array_int"},
		"AddrBackendList": {Paths: []string{"addrBackendList", "data.addrBackendList"}, FieldType: "array_string"},
	},
	"globalLimit": {
		"Comment": {Paths: []string{"comment", "data.comment", "desc"}},
		"RuleID":  {Paths: []string{"ruleId", "data.ruleId", "ids", "data.ids"}, FieldType: "array_int"},
	},
	"allowAndDeny": {
		"AllowAndDenyIps": {Paths: []string{"ip", "ips"}, FieldType: "array_string"},
		"RuleID":          {Paths: []string{"ruleId", "data.ruleId", "ids", "data.ids"}, FieldType: "array_int"},
	},
	"ccIpList": {
		"AllowAndDenyIps": {Paths: []string{"ip", "ips","newIp"}}, // 精确指定 ccIpList 只查找 "ip"
		"RuleID":          {Paths: []string{"ruleId", "data.ruleId", "ids", "data.ids"}, FieldType: "array_int"},
	},
	// "分配网关组" 的日志通常不包含用户层面的业务数据，所以这里不定义
}

// --- 2. 清洗后的统一数据结构 ---

type CleanedExtraData struct {
	Port            string
	Domain          string
	Comment         string
	IsHttps         int
	RuleID          []int64
	AddrBackendList []string
	CustomHost      []string
	AllowAndDenyIps string
}

// --- 3. 服务实现 ---

type WafLogDataCleanService interface {
	ParseWafLogExtraData(extraDataBytes json.RawMessage, apiName string) CleanedExtraData
	FormatBackendList(backendList interface{}) string
}

func NewWafLogDataCleanService(
	service *service.Service,
) WafLogDataCleanService {
	return &wafLogDataCleanService{
		Service: service,
	}
}

type wafLogDataCleanService struct {
	*service.Service
}

// ParseWafLogExtraData 使用配置驱动的 gjson 解析，兼具灵活性和可维护性
func (s *wafLogDataCleanService) ParseWafLogExtraData(extraDataBytes json.RawMessage, apiName string) CleanedExtraData {
	var cleaned CleanedExtraData
	if len(extraDataBytes) == 0 || !gjson.Valid(string(extraDataBytes)) {
		if len(extraDataBytes) > 0 {
			s.Logger.Warn("ExtraData 不是有效的JSON", zap.String("raw_data", string(extraDataBytes)))
		}
		return cleaned
	}
	jsonStr := string(extraDataBytes)

	// 根据 apiName 找到对应的字段映射配置
	var fieldConfig map[string]FieldPathConfig
	for keyword, config := range apiFieldMappings {
		if strings.Contains(strings.ToLower(apiName), keyword) {
			fieldConfig = config
			break
		}
	}

	// 如果没有找到配置，直接返回空结构
	if fieldConfig == nil {
		return cleaned
	}

	// 通用、循环地提取字段
	for fieldName, config := range fieldConfig {
		s.extractField(jsonStr, fieldName, config, &cleaned)
	}

	return cleaned
}

// extractField 是一个通用的字段提取辅助函数
func (s *wafLogDataCleanService) extractField(jsonStr, fieldName string, config FieldPathConfig, cleaned *CleanedExtraData) {
	// 找到第一个有效的路径和其结果
	var validPathResult gjson.Result
	for _, path := range config.Paths {
		result := gjson.Get(jsonStr, path)
		if result.Exists() {
			validPathResult = result
			break
		}
	}

	if !validPathResult.Exists() {
		return // 如果所有路径都找不到，直接返回
	}

	// 根据字段名称和类型将结果赋值给 CleanedExtraData
	switch fieldName {
	case "Comment":
		cleaned.Comment = validPathResult.String()
	case "Port":
		cleaned.Port = validPathResult.String()
	case "Domain":
		cleaned.Domain = validPathResult.String()
	case "IsHttps":
		cleaned.IsHttps = int(validPathResult.Int())
	case "RuleID":
		if validPathResult.IsArray() {
			validPathResult.ForEach(func(_, value gjson.Result) bool {
				cleaned.RuleID = append(cleaned.RuleID, value.Int())
				return true
			})
		} else {
			cleaned.RuleID = append(cleaned.RuleID, validPathResult.Int())
		}
	case "BackendList": // 特殊处理对象数组
		if validPathResult.IsArray() {
			validPathResult.ForEach(func(_, value gjson.Result) bool {
				if value.IsObject() {
					addr := gjson.Get(value.Raw, "addr").String()
					customHost := gjson.Get(value.Raw, "customHost").String()
					isHttps := gjson.Get(value.Raw, "isHttps").Int()
					if isHttps == 1 {
						addr = "https://" + addr
					} else {
						addr = "http://" + addr
					}
					cleaned.AddrBackendList = append(cleaned.AddrBackendList, addr)
					cleaned.CustomHost = append(cleaned.CustomHost, customHost)
				}
				return true
			})
		}
	case "AddrBackendList": // 处理字符串数组
		if validPathResult.IsArray() {
			validPathResult.ForEach(func(_, value gjson.Result) bool {
				cleaned.AddrBackendList = append(cleaned.AddrBackendList, value.String())
				return true
			})
		}
	case "AllowAndDenyIps":
		if validPathResult.IsArray() {
			var ips []string
			validPathResult.ForEach(func(_, value gjson.Result) bool {
				ips = append(ips, value.String())
				return true
			})
			cleaned.AllowAndDenyIps = strings.Join(ips, ", ")
		} else {
			cleaned.AllowAndDenyIps = validPathResult.String()
		}
	}
}

// FormatBackendList 格式化后端地址列表（已简化）
func (s *wafLogDataCleanService) FormatBackendList(backendList interface{}) string {
	if backendList == nil {
		return ""
	}

	switch v := backendList.(type) {
	case []string:
		return strings.Join(v, ", ")
	case []int64:
		if len(v) == 0 {
			return ""
		}
		var strList []string
		for _, id := range v {
			strList = append(strList, strconv.FormatInt(id, 10))
		}
		return strings.Join(strList, ", ")
	case string:
		return v
	default:
		// 其他类型直接转为字符串，作为最后的兼容手段
		return fmt.Sprintf("%v", v)
	}
}