package controllers

import (
	"encoding/json"
	"fmt"
	"math/rand"
	"shudao-chat-go/models"
	"shudao-chat-go/utils"
	"strconv"
	"strings"
	"time"

	"github.com/beego/beego/v2/server/web"
)

// TrackingController 埋点记录控制器
type TrackingController struct {
	web.Controller
}

// TrackingRequest 埋点请求结构（user_id从token中获取）
type TrackingRequest struct {
	ApiPath   string `json:"api_path"`
	Method    string `json:"method"`
	ExtraData string `json:"extra_data"`
}

// TrackingResponse 埋点响应结构
type TrackingResponse struct {
	Code    int    `json:"code"`
	Message string `json:"message"`
	Data    struct {
		RequestId string `json:"request_id"`
	} `json:"data"`
}

// RecordTracking 记录埋点数据
func (c *TrackingController) RecordTracking() {
	// 从token中获取用户信息
	userInfo, err := utils.GetUserInfoFromContext(c.Ctx.Input.GetData("userInfo"))
	if err != nil {
		c.Data["json"] = map[string]interface{}{
			"code":    401,
			"message": "获取用户信息失败: " + err.Error(),
		}
		c.ServeJSON()
		return
	}
	userID := int(userInfo.ID)
	if userID == 0 {
		userID = 1
	}

	var req TrackingRequest
	err = json.Unmarshal(c.Ctx.Input.RequestBody, &req)
	if err != nil {
		c.Data["json"] = map[string]interface{}{
			"code":    400,
			"message": "请求参数解析失败",
		}
		c.ServeJSON()
		return
	}

	if req.ApiPath == "" {
		c.Data["json"] = map[string]interface{}{
			"code":    400,
			"message": "接口路径不能为空",
		}
		c.ServeJSON()
		return
	}

	// 生成请求ID
	requestId := c.generateRequestID()

	// 获取客户端IP
	ipAddress := c.getClientIP()

	// 获取User-Agent
	userAgent := c.Ctx.Input.Header("User-Agent")
	if userAgent == "" {
		userAgent = "Unknown"
	}

	// 通过接口路径查找接口名称
	apiName := c.getApiNameByPath(req.ApiPath)

	// 创建埋点记录
	trackingRecord := models.TrackingRecord{
		UserID:    userID,
		ApiPath:   req.ApiPath,
		ApiName:   apiName,
		Method:    req.Method,
		UserAgent: userAgent,
		IpAddress: ipAddress,
		RequestId: requestId,
		Status:    1,
		Duration:  0, // 前端调用时暂时设为0，后续可以扩展
		ExtraData: req.ExtraData,
	}

	// 保存到数据库
	result := models.DB.Create(&trackingRecord)
	if result.Error != nil {
		c.Data["json"] = map[string]interface{}{
			"code":    500,
			"message": "埋点记录保存失败: " + result.Error.Error(),
		}
		c.ServeJSON()
		return
	}

	// 返回成功响应
	c.Data["json"] = TrackingResponse{
		Code:    200,
		Message: "埋点记录成功",
		Data: struct {
			RequestId string `json:"request_id"`
		}{
			RequestId: requestId,
		},
	}
	c.ServeJSON()
}

// getClientIP 获取客户端真实IP
func (c *TrackingController) getClientIP() string {
	// 优先从X-Forwarded-For获取
	xForwardedFor := c.Ctx.Input.Header("X-Forwarded-For")
	if xForwardedFor != "" {
		ips := strings.Split(xForwardedFor, ",")
		if len(ips) > 0 {
			return strings.TrimSpace(ips[0])
		}
	}

	// 从X-Real-IP获取
	xRealIP := c.Ctx.Input.Header("X-Real-IP")
	if xRealIP != "" {
		return xRealIP
	}

	// 从RemoteAddr获取
	remoteAddr := c.Ctx.Input.Context.Request.RemoteAddr
	if remoteAddr != "" {
		// 去掉端口号
		if colonIndex := strings.LastIndex(remoteAddr, ":"); colonIndex != -1 {
			return remoteAddr[:colonIndex]
		}
		return remoteAddr
	}

	return "Unknown"
}

// getApiNameByPath 通过接口路径获取接口名称
func (c *TrackingController) getApiNameByPath(apiPath string) string {
	// 首先从数据库查找映射关系
	var mapping models.ApiPathMapping
	result := models.DB.Where("api_path = ? AND status = 1", apiPath).First(&mapping)
	if result.Error == nil {
		return mapping.ApiName
	}

	// 如果数据库中没有找到，使用默认的路径解析规则
	return c.parseApiNameFromPath(apiPath)
}

// parseApiNameFromPath 从路径解析接口名称
func (c *TrackingController) parseApiNameFromPath(apiPath string) string {
	// 移除前缀 /apiv1/
	if strings.HasPrefix(apiPath, "/apiv1/") {
		apiPath = strings.TrimPrefix(apiPath, "/apiv1/")
	}

	// 移除开头的 /
	apiPath = strings.TrimPrefix(apiPath, "/")

	// 将路径转换为更友好的名称
	parts := strings.Split(apiPath, "/")
	var nameParts []string

	for _, part := range parts {
		if part != "" {
			// 将下划线替换为空格，并转换为标题格式
			part = strings.ReplaceAll(part, "_", " ")
			nameParts = append(nameParts, strings.Title(part))
		}
	}

	if len(nameParts) > 0 {
		return strings.Join(nameParts, " ")
	}

	return "未知接口"
}

// GetTrackingRecords 获取埋点记录列表
func (c *TrackingController) GetTrackingRecords() {
	// 获取查询参数
	userIDStr := c.GetString("user_id")
	apiPath := c.GetString("api_path")
	pageStr := c.GetString("page", "1")
	pageSizeStr := c.GetString("page_size", "20")

	// 转换分页参数
	page, err := strconv.Atoi(pageStr)
	if err != nil || page < 1 {
		page = 1
	}

	pageSize, err := strconv.Atoi(pageSizeStr)
	if err != nil || pageSize < 1 || pageSize > 100 {
		pageSize = 20
	}

	// 构建查询条件
	query := models.DB.Model(&models.TrackingRecord{})

	if userIDStr != "" {
		userID, err := strconv.Atoi(userIDStr)
		if err == nil {
			query = query.Where("user_id = ?", userID)
		}
	}

	if apiPath != "" {
		query = query.Where("api_path LIKE ?", "%"+apiPath+"%")
	}

	// 获取总数
	var total int64
	query.Count(&total)

	// 分页查询
	var records []models.TrackingRecord
	offset := (page - 1) * pageSize
	result := query.Order("created_at DESC").Offset(offset).Limit(pageSize).Find(&records)

	if result.Error != nil {
		c.Data["json"] = map[string]interface{}{
			"code":    500,
			"message": "查询失败: " + result.Error.Error(),
		}
		c.ServeJSON()
		return
	}

	// 返回结果
	c.Data["json"] = map[string]interface{}{
		"code":    200,
		"message": "查询成功",
		"data": map[string]interface{}{
			"list":      records,
			"total":     total,
			"page":      page,
			"page_size": pageSize,
		},
	}
	c.ServeJSON()
}

// AddApiMapping 添加接口路径映射
func (c *TrackingController) AddApiMapping() {
	var req struct {
		ApiPath string `json:"api_path"`
		ApiName string `json:"api_name"`
		ApiDesc string `json:"api_desc"`
	}

	err := json.Unmarshal(c.Ctx.Input.RequestBody, &req)
	if err != nil {
		c.Data["json"] = map[string]interface{}{
			"code":    400,
			"message": "请求参数解析失败",
		}
		c.ServeJSON()
		return
	}

	// 验证必要参数
	if req.ApiPath == "" || req.ApiName == "" {
		c.Data["json"] = map[string]interface{}{
			"code":    400,
			"message": "接口路径和接口名称不能为空",
		}
		c.ServeJSON()
		return
	}

	// 检查是否已存在
	var existingMapping models.ApiPathMapping
	result := models.DB.Where("api_path = ?", req.ApiPath).First(&existingMapping)
	if result.Error == nil {
		c.Data["json"] = map[string]interface{}{
			"code":    400,
			"message": "该接口路径已存在映射",
		}
		c.ServeJSON()
		return
	}

	// 创建新映射
	mapping := models.ApiPathMapping{
		ApiPath: req.ApiPath,
		ApiName: req.ApiName,
		ApiDesc: req.ApiDesc,
		Status:  1,
	}

	result = models.DB.Create(&mapping)
	if result.Error != nil {
		c.Data["json"] = map[string]interface{}{
			"code":    500,
			"message": "添加映射失败: " + result.Error.Error(),
		}
		c.ServeJSON()
		return
	}

	c.Data["json"] = map[string]interface{}{
		"code":    200,
		"message": "添加映射成功",
		"data":    mapping,
	}
	c.ServeJSON()
}

// GetApiMappings 获取接口路径映射列表
func (c *TrackingController) GetApiMappings() {
	var mappings []models.ApiPathMapping
	result := models.DB.Where("status = 1").Order("created_at DESC").Find(&mappings)

	if result.Error != nil {
		c.Data["json"] = map[string]interface{}{
			"code":    500,
			"message": "查询失败: " + result.Error.Error(),
		}
		c.ServeJSON()
		return
	}

	c.Data["json"] = map[string]interface{}{
		"code":    200,
		"message": "查询成功",
		"data":    mappings,
	}
	c.ServeJSON()
}

// generateRequestID 生成请求ID
func (c *TrackingController) generateRequestID() string {
	// 使用时间戳和随机数生成唯一ID
	timestamp := time.Now().UnixNano()
	randomNum := rand.Intn(10000)
	return fmt.Sprintf("%d_%d", timestamp, randomNum)
}