resume/internal/handler/admin.go

package handler

import (
	"bytes"
	"crypto/hmac"
	"crypto/rand"
	"crypto/sha256"
	"encoding/base64"
	"encoding/json"
	"fmt"
	"html/template"
	"log"
	"net/http"
	"os"
	"resume-platform/internal/model"
	"resume-platform/internal/repository"
	"resume-platform/internal/security"
	"resume-platform/pkg/config"
	"runtime"
	"strconv"
	"strings"
	"sync"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
)

const (
	tokenExpiryDuration = 7 * 24 * time.Hour
	tokenRenewInterval  = 1 * time.Hour
	tokenSecret         = "resume-platform-admin-secret-key"
	tokenStorageFile    = "./data/admin_tokens.json"
	settingsFile        = "./data/settings.json"
)

// parseInt 安全解析整数，解析失败返回默认值
// @param s 待解析字符串
// @param defaultValue 解析失败时的默认值
// @author sunct
func parseInt(s string, defaultValue int) int {
	if s == "" {
		return defaultValue
	}
	v, err := strconv.Atoi(s)
	if err != nil {
		return defaultValue
	}
	return v
}

var (
	adminTokens = make(map[string]tokenInfo)
	tokensMutex sync.RWMutex
	resumeRepo  repository.ResumeRepository
)

type tokenInfo struct {
	Username     string      `json:"username"`
	ExpiresAt    localTime   `json:"expires_at"`
	CreatedAt    localTime   `json:"created_at"`
	LastActivity localTime   `json:"last_activity"`
}

type localTime time.Time

func (t localTime) MarshalJSON() ([]byte, error) {
	return []byte(`"` + time.Time(t).Local().Format(time.RFC3339) + `"`), nil
}

func (t *localTime) UnmarshalJSON(data []byte) error {
	s := strings.Trim(string(data), `"`)
	parsed, err := time.Parse(time.RFC3339, s)
	if err != nil {
		return err
	}
	*t = localTime(parsed.Local())
	return nil
}

// LoadTokens 从本地文件加载已保存的管理员令牌到内存
// @author sunct
func LoadTokens() {
	tokensMutex.Lock()
	defer tokensMutex.Unlock()

	data, err := os.ReadFile(tokenStorageFile)
	if err != nil {
		return
	}

	var storedTokens map[string]tokenInfo
	if err := json.Unmarshal(data, &storedTokens); err != nil {
		return
	}

	now := time.Now()
	for token, info := range storedTokens {
		if now.Before(time.Time(info.ExpiresAt)) {
			adminTokens[token] = info
		}
	}
}

// SaveTokens 将内存中的管理员令牌持久化到本地文件
// @author sunct
func SaveTokens() {
	tokensMutex.RLock()
	defer tokensMutex.RUnlock()

	data, err := json.Marshal(adminTokens)
	if err != nil {
		return
	}

	os.WriteFile(tokenStorageFile, data, 0600)
}

// SetResumeRepository 注入简历数据仓库实例，供包级函数使用
// @param repo 数据仓库接口实现
// @author sunct
func SetResumeRepository(repo repository.ResumeRepository) {
	resumeRepo = repo
}

// AdminHandler 后台管理处理器
type AdminHandler struct {
	config      *config.Config
	rateLimiter *security.RateLimiter
	startTime   time.Time
}

// NewAdminHandler 创建后台管理处理器实例
// @param config 系统配置
// @param rateLimiter 限流器
// @return *AdminHandler 处理器实例
// @author sunct
func NewAdminHandler(config *config.Config, rateLimiter *security.RateLimiter) *AdminHandler {
	return &AdminHandler{
		config:      config,
		rateLimiter: rateLimiter,
		startTime:   time.Now(),
	}
}

// getAdminPath 获取后台登录入口路径，优先使用配置项
// @return string 登录路径
// @author sunct
func (h *AdminHandler) getAdminPath() string {
	if h.config.Auth.AdminPath != "" {
		return h.config.Auth.AdminPath
	}
	return "/admin"
}

// getDashboardPath 获取后台管理根路径
// @return string 后台路径
// @author sunct
func (h *AdminHandler) getDashboardPath() string {
	return "/dashboard"
}

// createNotification 创建系统通知的辅助函数
// @param nType 通知类型
// @param title 通知标题
// @param message 通知内容
// @param url 跳转链接
// @author sunct
func createNotification(nType, title, message, url string) {
	if resumeRepo == nil {
		return
	}
	resumeRepo.CreateNotification(&model.Notification{
		Type:    nType,
		Title:   title,
		Message: message,
		URL:     url,
	})
}

// LoginPage 渲染后台登录页面
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) LoginPage(c *gin.Context) {
	t, err := template.ParseFiles("templates/admin/login.html")
	if err != nil {
		c.String(http.StatusInternalServerError, "Template load error: "+err.Error())
		return
	}

	getConfig, _ := resumeRepo.GetSystemConfig()
	if getConfig == nil {
		getConfig = &model.SystemConfig{
			WebsiteDomain:   "http://localhost:8090",
			WebsiteTitle:    "Resume Platform",
			WebsiteDesc:     "现代化的开源简历平台，支持多人简历管理、自定义模板、实时预览",
			WebsiteKeywords: "简历平台,开源,个人主页,作品集,简历管理",
		}
	}

	var buf bytes.Buffer
	err = t.Execute(&buf, gin.H{
		"adminPath":    h.getAdminPath(),
		"SystemConfig": getConfig,
	})
	if err != nil {
		c.String(http.StatusInternalServerError, "Template render error: "+err.Error())
		return
	}

	c.Header("Content-Type", "text/html; charset=utf-8")
	c.String(http.StatusOK, buf.String())
}

// Login 处理管理员登录验证，包含验证码校验、限流和令牌生成
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) Login(c *gin.Context) {
	ip := c.ClientIP()
	userAgent := c.GetHeader("User-Agent")

	allowed, remaining := h.rateLimiter.Allow(ip)
	if !allowed {
		h.recordLoginHistory(ip, userAgent, "", "", false, "登录次数过多")
		c.JSON(http.StatusTooManyRequests, gin.H{"success": false, "message": "登录次数过多，请稍后重试", "remaining": 0})
		return
	}

	var credentials struct {
		Username     string `json:"username" form:"username"`
		Password     string `json:"password" form:"password"`
		Captcha      string `json:"captcha" form:"captcha"`
		CaptchaToken string `json:"captcha_token" form:"captcha_token"`
	}

	if err := c.ShouldBind(&credentials); err != nil {
		h.rateLimiter.RecordAttempt(ip)
		h.recordLoginHistory(ip, userAgent, credentials.Username, "", false, "请求参数错误")
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": "请求参数错误", "remaining": remaining - 1})
		return
	}

	if !security.Verify(credentials.CaptchaToken, credentials.Captcha) {
		h.rateLimiter.RecordAttempt(ip)
		h.recordLoginHistory(ip, userAgent, credentials.Username, "", false, "验证码错误")
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": "验证码错误", "remaining": remaining - 1})
		return
	}

	if credentials.Username == h.config.Auth.Username && credentials.Password == h.config.Auth.Password {
		h.rateLimiter.Reset(ip)

		newToken := generateEncryptedToken(credentials.Username)
		now := time.Now()

		tokensMutex.Lock()
		for token, info := range adminTokens {
			if info.Username == credentials.Username {
				delete(adminTokens, token)
			}
		}
		adminTokens[newToken] = tokenInfo{
			Username:     credentials.Username,
			ExpiresAt:    localTime(now.Add(tokenExpiryDuration)),
			CreatedAt:    localTime(now),
			LastActivity: localTime(now),
		}
		tokensMutex.Unlock()
		SaveTokens()

		h.recordLoginHistory(ip, userAgent, credentials.Username, "管理员", true, "登录成功")

		c.SetCookie("admin_token", newToken, int(tokenExpiryDuration.Seconds()), "/", "", false, true)
		c.JSON(http.StatusOK, gin.H{"success": true, "redirect": h.getDashboardPath() + "/home"})
		return
	}

	h.rateLimiter.RecordAttempt(ip)
	h.recordLoginHistory(ip, userAgent, credentials.Username, "", false, "用户名或密码错误")
	c.JSON(http.StatusUnauthorized, gin.H{"success": false, "message": "用户名或密码错误", "remaining": remaining - 1})
}

// recordLoginHistory 异步记录登录历史
// @param ip 客户端IP
// @param userAgent 用户代理
// @param username 用户名
// @param displayName 显示名称
// @param success 是否登录成功
// @param message 结果消息
// @author sunct
func (h *AdminHandler) recordLoginHistory(ip, userAgent, username, displayName string, success bool, message string) {
	go func() {
		history := &model.LoginHistory{
			ID:        uuid.NewString(),
			UserID:    "",
			UserName:  displayName,
			IP:        ip,
			Location:  "",
			UserAgent: userAgent,
			Success:   success,
			Message:   message,
		}
		resumeRepo.CreateLoginHistory(history)
	}()
}

// Captcha 生成并返回图形验证码
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) Captcha(c *gin.Context) {
	security.ServeCaptcha(c.Writer)
}

// Logout 处理管理员退出登录，清除令牌和Cookie
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) Logout(c *gin.Context) {
	token, err := c.Cookie("admin_token")
	if err == nil && token != "" {
		tokensMutex.Lock()
		delete(adminTokens, token)
		tokensMutex.Unlock()
		SaveTokens()
	}
	c.SetCookie("admin_token", "", -1, "/", "", false, true)
	c.Redirect(http.StatusFound, h.getAdminPath()+"/login")
}

// AuthMiddleware 后台认证中间件，校验 Cookie 令牌有效性并自动续期
// @return gin.HandlerFunc Gin中间件处理函数
// @author sunct
func (h *AdminHandler) AuthMiddleware() gin.HandlerFunc {
	return func(c *gin.Context) {
		if !h.config.Auth.Enabled {
			c.Next()
			return
		}

		token, err := c.Cookie("admin_token")
		if err != nil || token == "" {
			h.render401Page(c)
			c.Abort()
			return
		}

		tokensMutex.Lock()
		info, exists := adminTokens[token]
		if !exists {
			tokensMutex.Unlock()
			c.SetCookie("admin_token", "", -1, "/", "", false, true)
			h.render401Page(c)
			c.Abort()
			return
		}

		now := time.Now()
		if now.After(time.Time(info.ExpiresAt)) {
			delete(adminTokens, token)
			tokensMutex.Unlock()
			SaveTokens()
			c.SetCookie("admin_token", "", -1, "/", "", false, true)
			h.render401Page(c)
			c.Abort()
			return
		}

		sinceLastActivity := now.Sub(time.Time(info.LastActivity))
		needSave := false

		info.LastActivity = localTime(now)

		if sinceLastActivity >= tokenRenewInterval {
			info.ExpiresAt = localTime(now.Add(tokenExpiryDuration))
			needSave = true
		}

		adminTokens[token] = info
		tokensMutex.Unlock()

		if needSave {
			SaveTokens()
			c.SetCookie("admin_token", token, int(tokenExpiryDuration.Seconds()), "/", "", false, true)
		}

		c.Set("username", info.Username)
		c.Next()
	}
}

// render401Page 渲染 401 未授权错误页面
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) render401Page(c *gin.Context) {
	t, err := template.ParseFiles("templates/admin/401.html")
	if err != nil {
		c.String(http.StatusUnauthorized, "401 Unauthorized")
		return
	}

	var buf bytes.Buffer
	err = t.Execute(&buf, gin.H{
		"AdminPath": h.getAdminPath(),
	})
	if err != nil {
		c.String(http.StatusUnauthorized, "401 Unauthorized")
		return
	}

	c.Header("Content-Type", "text/html; charset=utf-8")
	c.String(http.StatusUnauthorized, buf.String())
}

// generateEncryptedToken 生成 HMAC-SHA256 签名的加密认证令牌
// @param username 用户名
// @return string Base64编码的令牌
// @author sunct
func generateEncryptedToken(username string) string {
	randomBytes := make([]byte, 16)
	rand.Read(randomBytes)

	timestamp := fmt.Sprintf("%d", time.Now().UnixNano())
	payload := username + ":" + timestamp + ":" + base64.URLEncoding.EncodeToString(randomBytes)

	h := hmac.New(sha256.New, []byte(tokenSecret))
	h.Write([]byte(payload))
	signature := h.Sum(nil)

	token := base64.URLEncoding.EncodeToString(signature) + "." + base64.URLEncoding.EncodeToString([]byte(payload))

	return token
}

// getMenus 获取后台侧边栏固定菜单配置
// @return []*model.Menu 菜单列表
// @author sunct
func (h *AdminHandler) getMenus() []*model.Menu {
	return []*model.Menu{
		{ID: "home", Name: "后台首页", Icon: "fas fa-home", Path: "home", IsEnabled: true, SortOrder: 10},
		{ID: "users", Name: "人员管理", Icon: "fas fa-users", Path: "users", IsEnabled: true, SortOrder: 20},
		{ID: "resumes", Name: "简历管理", Icon: "fas fa-file-alt", Path: "resumes", IsEnabled: true, SortOrder: 25},
		{ID: "portfolios", Name: "作品集", Icon: "fas fa-folder-open", Path: "portfolios", IsEnabled: true, SortOrder: 27},
		{ID: "quiz", Name: "面试答题", Icon: "fas fa-question-circle", Path: "quiz", IsEnabled: true, SortOrder: 28},
		{ID: "settings", Name: "系统设置", Icon: "fas fa-cog", Path: "settings", IsEnabled: true, SortOrder: 30},
	}
}

// substr Unicode 安全的字符串截取函数，支持中文等多字节字符
// @param s 源字符串
// @param start 起始位置（负数表示从末尾倒数）
// @param length 截取长度（可选，省略则截取到末尾）
// @return string 截取后的子串
// @author sunct
func substr(s string, start int, length ...int) string {
	if len(s) == 0 {
		return ""
	}

	runes := []rune(s)
	runeLen := len(runes)

	startIdx := 0
	if start < 0 {
		startIdx = runeLen + start
		if startIdx < 0 {
			startIdx = 0
		}
	} else {
		startIdx = start
	}

	if startIdx >= runeLen {
		return ""
	}

	if len(length) == 0 {
		return string(runes[startIdx:])
	}

	endIdx := startIdx + length[0]
	if endIdx > runeLen {
		endIdx = runeLen
	}

	return string(runes[startIdx:endIdx])
}

// renderContentTemplate 渲染内容区模板为 HTML 字符串
// @param templateName 模板文件名（不含后缀）
// @param data 模板数据
// @return template.HTML 渲染后的HTML内容
// @author sunct
func (h *AdminHandler) renderContentTemplate(templateName string, data interface{}) template.HTML {
	templatePath := "templates/admin/" + templateName + ".html"
	content, err := os.ReadFile(templatePath)
	if err != nil {
		log.Printf("[ERROR] Failed to read template file: %s, error: %v", templatePath, err)
		if h.config.Server.Debug {
			return template.HTML("Template load error: " + err.Error())
		}
		return template.HTML("Template load error")
	}

	t, err := template.New(templateName).Funcs(template.FuncMap{
		"substr":   substr,
		"add":      func(a, b int) int { return a + b },
		"subtract": func(a, b int) int { return a - b },
		"to": func(a, b int) []int {
			if b < a {
				return []int{}
			}
			r := make([]int, b-a+1)
			for i := range r {
				r[i] = a + i
			}
			return r
		},
		"join": func(slice []string, sep string) string {
			result := ""
			for i, s := range slice {
				if i > 0 {
					result += sep
				}
				result += s
			}
			return result
		},
	}).Parse(string(content))
	if err != nil {
		log.Printf("[ERROR] Failed to parse template: %s, error: %v", templatePath, err)
		if h.config.Server.Debug {
			return template.HTML("Template parse error: " + err.Error())
		}
		return template.HTML("Template parse error")
	}

	var buf bytes.Buffer
	if err := t.Execute(&buf, data); err != nil {
		log.Printf("[ERROR] Failed to execute template: %s, error: %v", templatePath, err)
		if h.config.Server.Debug {
			return template.HTML("Template render error: " + err.Error())
		}
		return template.HTML("Template render error")
	}

	return template.HTML(buf.String())
}

// renderAdminPage 渲染完整后台页面（基础布局模板 + 内容模板组合）
// @param c Gin 上下文
// @param pageTitle 页面标题
// @param currentMenu 当前高亮菜单ID
// @param contentTemplate 内容模板名
// @param contentData 内容模板数据
// @param extraScripts 额外注入的脚本
// @author sunct
func (h *AdminHandler) renderAdminPage(c *gin.Context, pageTitle, currentMenu, contentTemplate string, contentData interface{}, extraScripts string) {
	content := h.renderContentTemplate(contentTemplate, contentData)

	t := template.New("base.html").Funcs(template.FuncMap{
		"substr":   substr,
		"add":      func(a, b int) int { return a + b },
		"subtract": func(a, b int) int { return a - b },
		"to": func(a, b int) []int {
			if b < a {
				return []int{}
			}
			r := make([]int, b-a+1)
			for i := range r {
				r[i] = a + i
			}
			return r
		},
		"join": func(slice []string, sep string) string {
			result := ""
			for i, s := range slice {
				if i > 0 {
					result += sep
				}
				result += s
			}
			return result
		},
	})
	t, err := t.ParseFiles("templates/admin/base.html")
	if err != nil {
		log.Printf("[ERROR] Failed to load template: %v", err)
		if h.config.Server.Debug {
			c.String(http.StatusInternalServerError, "Template load error: "+err.Error())
		} else {
			c.String(http.StatusInternalServerError, "Template load error")
		}
		return
	}

	username, _ := c.Get("username")

	var buf bytes.Buffer
	err = t.Execute(&buf, gin.H{
		"PageTitle":    pageTitle,
		"AdminPath":    h.getDashboardPath(),
		"Username":     username,
		"CurrentMenu":  currentMenu,
		"Menus":        h.getMenus(),
		"Content":      content,
		"ExtraScripts": extraScripts,
		"Config":       h.loadSettings(),
	})
	if err != nil {
		log.Printf("[ERROR] Failed to render template: %v", err)
		if h.config.Server.Debug {
			c.String(http.StatusInternalServerError, "Template render error: "+err.Error())
		} else {
			c.String(http.StatusInternalServerError, "Template render error")
		}
		return
	}

	c.Header("Content-Type", "text/html; charset=utf-8")
	c.String(http.StatusOK, buf.String())
}

// HomePage 渲染后台首页仪表盘，展示统计数据和最近动态
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) HomePage(c *gin.Context) {
	var stats struct {
		TotalUsers        int
		TotalResumes      int
		TotalPortfolio    int
		TotalQuizRecords  int
		TotalFavorites    int
		TotalWrongAnswers int
	}

	var recentUsers []*model.User
	var recentResumes []*model.Resume

	if resumeRepo != nil {
		users, _ := resumeRepo.GetAllUsers()
		stats.TotalUsers = len(users)

		resumes, _ := resumeRepo.GetAllResumes()
		stats.TotalResumes = len(resumes)

		portfolioItems, _ := resumeRepo.GetPortfolioItems()
		stats.TotalPortfolio = len(portfolioItems)

		allRecords := make([]*model.QuizRecord, 0)
		allFavorites := make([]*model.FavoriteQuestion, 0)
		for _, u := range users {
			records, _ := resumeRepo.GetQuizRecordsByUserID(u.ID)
			allRecords = append(allRecords, records...)

			favs, _ := resumeRepo.GetFavoriteQuestionsByUserID(u.ID)
			allFavorites = append(allFavorites, favs...)
		}
		stats.TotalQuizRecords = len(allRecords)

		favCount := 0
		wrongCount := 0
		for _, f := range allFavorites {
			if f.IsFavorite {
				favCount++
			}
			if !f.IsCorrect {
				wrongCount++
			}
		}
		stats.TotalFavorites = favCount
		stats.TotalWrongAnswers = wrongCount

		// 复用已查询数据，避免重复请求
		recentUsers = users
		if len(recentUsers) > 5 {
			recentUsers = recentUsers[:5]
		}
		recentResumes = resumes
		if len(recentResumes) > 5 {
			recentResumes = recentResumes[:5]
		}
	}

	h.renderAdminPage(c, "后台首页", "home", "home", gin.H{
		"Stats":         stats,
		"RecentUsers":   recentUsers,
		"RecentResumes": recentResumes,
		"AdminPath":     h.getDashboardPath(),
		"Uptime":        time.Since(h.startTime).Round(time.Second).String(),
	}, "")
}

// UsersPage 渲染人员管理列表页，支持分页
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) UsersPage(c *gin.Context) {
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	if page < 1 {
		page = 1
	}
	pageSize := h.getPageSize()

	users, total, _ := resumeRepo.GetUsersWithPagination(page, pageSize)
	totalPages := (total + pageSize - 1) / pageSize

	h.renderAdminPage(c, "人员管理", "users", "users", gin.H{
		"Users":      users,
		"Page":       page,
		"TotalPages": totalPages,
		"Total":      total,
		"AdminPath":  h.getDashboardPath(),
	}, "")
}

// ResumesPage 渲染简历管理列表页，支持多条件筛选和分页
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) ResumesPage(c *gin.Context) {
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	if page < 1 {
		page = 1
	}
	pageSize := h.getPageSize()

	// 筛选参数
	userID := c.Query("user_id")
	keyword := c.Query("keyword")
	template := c.Query("template")
	showInHomeStr := c.Query("show_in_home")
	var showInHome *bool
	if showInHomeStr == "1" {
		t := true
		showInHome = &t
	} else if showInHomeStr == "0" {
		f := false
		showInHome = &f
	}

	resumes, total, _ := resumeRepo.GetResumesWithFilter(page, pageSize, userID, keyword, template, showInHome)
	totalPages := (total + pageSize - 1) / pageSize
	users, _ := resumeRepo.GetAllUsers()

	userMap := make(map[string]*model.User)
	for _, u := range users {
		userMap[u.ID] = u
	}

	// 构建分页链接需要保留的筛选查询字符串前缀（不含 page）
	filterQuery := ""
	if userID != "" {
		filterQuery += "&user_id=" + userID
	}
	if keyword != "" {
		filterQuery += "&keyword=" + keyword
	}
	if template != "" {
		filterQuery += "&template=" + template
	}
	if showInHomeStr != "" {
		filterQuery += "&show_in_home=" + showInHomeStr
	}

	h.renderAdminPage(c, "简历管理", "resumes", "resumes", gin.H{
		"Resumes":          resumes,
		"Users":            users,
		"UserMap":          userMap,
		"Page":             page,
		"TotalPages":       totalPages,
		"Total":            total,
		"AdminPath":        h.getDashboardPath(),
		"FilterUserID":     userID,
		"FilterKeyword":    keyword,
		"FilterTemplate":   template,
		"FilterShowInHome": showInHomeStr,
		"FilterQuery":      filterQuery,
	}, "")
}

// PortfoliosPage 渲染作品集项目列表页，支持分页
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) PortfoliosPage(c *gin.Context) {
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	if page < 1 {
		page = 1
	}
	pageSize := h.getPageSize()

	items, total, _ := resumeRepo.GetPortfolioItemsWithPagination(page, pageSize)
	totalPages := (total + pageSize - 1) / pageSize
	users, _ := resumeRepo.GetAllUsers()

	userMap := make(map[string]*model.User)
	for _, u := range users {
		userMap[u.ID] = u
	}

	h.renderAdminPage(c, "作品集", "portfolios", "portfolios", gin.H{
		"Items":      items,
		"Users":      users,
		"UserMap":    userMap,
		"Page":       page,
		"TotalPages": totalPages,
		"Total":      total,
		"AdminPath":  h.getDashboardPath(),
	}, "")
}

// PortfolioAddPage 渲染新增作品集项目表单页
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) PortfolioAddPage(c *gin.Context) {
	users, _ := resumeRepo.GetAllUsers()
	resumes, _, _ := resumeRepo.GetResumesWithPagination(1, 100)

	h.renderAdminPage(c, "新增项目", "portfolios", "portfolio-edit", gin.H{
		"Item":      &model.PortfolioItem{},
		"Users":     users,
		"Resumes":   resumes,
		"AdminPath": h.getDashboardPath(),
	}, "")
}

// PortfolioEditPage 渲染编辑作品集项目表单页
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) PortfolioEditPage(c *gin.Context) {
	id, _ := strconv.ParseUint(c.Param("id"), 10, 64)
	item, _ := resumeRepo.GetPortfolioItem(uint(id))
	users, _ := resumeRepo.GetAllUsers()
	resumes, _, _ := resumeRepo.GetResumesWithPagination(1, 100)

	if item == nil {
		c.String(http.StatusNotFound, "项目不存在")
		return
	}

	h.renderAdminPage(c, "编辑项目", "portfolios", "portfolio-edit", gin.H{
		"Item":      item,
		"Users":     users,
		"Resumes":   resumes,
		"AdminPath": h.getDashboardPath(),
	}, "")
}

// QuizPage 渲染面试答题总览页，展示所有用户的答题统计
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) QuizPage(c *gin.Context) {
	page, _ := strconv.Atoi(c.Query("page"))
	if page < 1 {
		page = 1
	}

	pageSize := h.getPageSize()

	users, totalRecords, _ := resumeRepo.GetUsersWithPagination(page, pageSize)

	type UserQuizStats struct {
		User            *model.User
		TotalAttempts   int
		CorrectRate     int
		FavoriteCount   int
		WrongCount      int
		TotalScore      float64
		AvgScore        float64
		LastAttemptDate string
	}

	var usersWithStats []UserQuizStats
	var totalStats struct {
		TotalAttempts  int
		TotalFavorites int
		TotalWrong     int
	}

	for _, user := range users {
		quizRecords, _ := resumeRepo.GetQuizRecordsByUserID(user.ID)
		favoriteQuestions, _ := resumeRepo.GetFavoriteQuestionsByUserID(user.ID)

		totalAttempts := len(quizRecords)
		totalCorrect := 0
		totalQuestions := 0
		totalScore := 0.0
		lastAttemptDate := ""
		favoriteCount := 0
		wrongCount := 0

		for _, record := range quizRecords {
			totalCorrect += record.CorrectCount
			totalQuestions += record.TotalCount
			totalScore += record.Score
			if record.CreatedAt > lastAttemptDate {
				lastAttemptDate = record.CreatedAt
			}
		}

		for _, fq := range favoriteQuestions {
			if fq.IsFavorite {
				favoriteCount++
			}
			if !fq.IsCorrect {
				wrongCount++
			}
		}

		totalStats.TotalAttempts += totalAttempts
		totalStats.TotalFavorites += favoriteCount
		totalStats.TotalWrong += wrongCount

		correctRate := 0
		if totalQuestions > 0 {
			correctRate = int(float64(totalCorrect) / float64(totalQuestions) * 100)
		}

		avgScore := 0.0
		if totalAttempts > 0 {
			avgScore = totalScore / float64(totalAttempts)
		}

		usersWithStats = append(usersWithStats, UserQuizStats{
			User:            user,
			TotalAttempts:   totalAttempts,
			CorrectRate:     correctRate,
			FavoriteCount:   favoriteCount,
			WrongCount:      wrongCount,
			TotalScore:      totalScore,
			AvgScore:        avgScore,
			LastAttemptDate: lastAttemptDate,
		})
	}

	totalPages := (totalRecords + pageSize - 1) / pageSize

	h.renderAdminPage(c, "面试答题", "quiz", "quiz", gin.H{
		"UsersWithStats": usersWithStats,
		"TotalStats":     totalStats,
		"TotalRecords":   totalRecords,
		"TotalPages":     totalPages,
		"CurrentPage":    page,
		"PageSize":       pageSize,
		"AdminPath":      h.getDashboardPath(),
	}, "")
}

// QuizGeneratePage 渲染 AI 生成题目配置页
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) QuizGeneratePage(c *gin.Context) {
	userID := c.Param("id")

	user, _ := resumeRepo.GetUserByID(userID)
	resumes, _ := resumeRepo.GetResumesByUserID(userID)

	h.renderAdminPage(c, "AI生成题目", "quiz", "quiz-generate", gin.H{
		"User":      user,
		"Resumes":   resumes,
		"AdminPath": h.getDashboardPath(),
	}, "")
}

// UserResumePage 渲染单个用户的简历管理页
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) UserResumePage(c *gin.Context) {
	userID := c.Param("id")

	user, _ := resumeRepo.GetUserByID(userID)
	resumes, _ := resumeRepo.GetResumesByUserID(userID)

	h.renderAdminPage(c, "个人简历", "resumes", "user-resume", gin.H{
		"User":      user,
		"Resumes":   resumes,
		"AdminPath": h.getDashboardPath(),
	}, "")
}

// ResumeAddPage 渲染添加简历表单页（不绑定用户）
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) ResumeAddPage(c *gin.Context) {
	resume := &model.Resume{
		ShowInHome: true,
	}

	h.renderAdminPage(c, "添加简历", "resumes", "resume-edit", gin.H{
		"User":      nil,
		"Resume":    resume,
		"IsNew":     true,
		"AdminPath": h.getDashboardPath(),
	}, "")
}

// ResumeEditPageWithoutUser 渲染无用户绑定的简历编辑页
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) ResumeEditPageWithoutUser(c *gin.Context) {
	resumeID := c.Param("id")

	resume, _ := resumeRepo.GetResume(resumeID)
	if resume == nil {
		c.Redirect(http.StatusMovedPermanently, h.getDashboardPath()+"/resumes")
		return
	}

	h.renderAdminPage(c, "编辑简历", "resumes", "resume-edit", gin.H{
		"User":      nil,
		"Resume":    resume,
		"IsNew":     false,
		"AdminPath": h.getDashboardPath(),
	}, "")
}

// ResumeEditPage 渲染完整字段的简历编辑页（支持新建和编辑）
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) ResumeEditPage(c *gin.Context) {
	userID := c.Param("id")
	resumeID := c.Param("resume_id")

	user, _ := resumeRepo.GetUserByID(userID)

	if user == nil {
		c.Redirect(http.StatusMovedPermanently, h.getDashboardPath()+"/resumes")
		return
	}

	var resume *model.Resume
	var isNew bool

	if resumeID == "new" {
		isNew = true
		resume = &model.Resume{
			UserID:     userID,
			ShowInHome: true,
			BasicInfo: model.BasicInfo{
				Name:  user.Name,
				Email: user.Email,
				Phone: user.Phone,
			},
		}
	} else {
		isNew = false
		resume, _ = resumeRepo.GetResume(resumeID)
		if resume == nil {
			resume = &model.Resume{
				UserID:     userID,
				ShowInHome: true,
				BasicInfo: model.BasicInfo{
					Name:  user.Name,
					Email: user.Email,
					Phone: user.Phone,
				},
			}
		}
	}

	h.renderAdminPage(c, "编辑简历", "resumes", "resume-edit", gin.H{
		"User":      user,
		"Resume":    resume,
		"IsNew":     isNew,
		"AdminPath": h.getDashboardPath(),
	}, "")
}

// UserPortfolioPage 渲染单个用户的作品集管理页
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) UserPortfolioPage(c *gin.Context) {
	userID := c.Param("id")

	user, _ := resumeRepo.GetUserByID(userID)
	portfolioItems, _ := resumeRepo.GetPortfolioItemsByUserID(userID)

	h.renderAdminPage(c, "作品集管理", "portfolios", "user-portfolio", gin.H{
		"User":           user,
		"PortfolioItems": portfolioItems,
		"AdminPath":      h.getDashboardPath(),
	}, "")
}

// UserQuizPage 渲染单个用户的面试题库页，含答题记录和统计
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) UserQuizPage(c *gin.Context) {
	userID := c.Param("id")

	page := parseInt(c.DefaultQuery("page", "1"), 1)
	pageSize := 10

	user, _ := resumeRepo.GetUserByID(userID)
	resumes, _ := resumeRepo.GetResumesByUserID(userID)
	quizRecords, totalRecords, _ := resumeRepo.GetQuizRecordsByUserIDWithPagination(userID, page, pageSize)

	var favoriteCount, wrongCount int
	var totalScore float64
	var avgScore int
	favoriteQuestions, _ := resumeRepo.GetFavoriteQuestionsByUserID(userID)
	for _, fq := range favoriteQuestions {
		if fq.IsFavorite {
			favoriteCount++
		}
		if !fq.IsCorrect {
			wrongCount++
		}
	}

	allRecords, _ := resumeRepo.GetQuizRecordsByUserID(userID)
	for _, r := range allRecords {
		totalScore += r.Score
	}
	if len(allRecords) > 0 {
		avgScore = int(totalScore / float64(len(allRecords)))
	}

	totalPages := (totalRecords + pageSize - 1) / pageSize

	h.renderAdminPage(c, "面试题库", "quiz", "user-quiz", gin.H{
		"User":              user,
		"Resumes":           resumes,
		"QuizRecords":       quizRecords,
		"TotalRecords":      totalRecords,
		"TotalPages":        totalPages,
		"CurrentPage":       page,
		"PageSize":          pageSize,
		"FavoriteQuestions": favoriteQuestions,
		"FavoriteCount":     favoriteCount,
		"WrongCount":        wrongCount,
		"AvgScore":          avgScore,
		"AdminPath":         h.getDashboardPath(),
	}, "")
}

// QuizRecordDetailPage 渲染单条答题记录详情页，展示题目和答案
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) QuizRecordDetailPage(c *gin.Context) {
	userID := c.Param("id")
	recordID := c.Param("record_id")

	user, _ := resumeRepo.GetUserByID(userID)
	record, _ := resumeRepo.GetQuizRecord(recordID)

	if user == nil || record == nil {
		c.String(http.StatusNotFound, "记录不存在")
		return
	}

	type questionWithCorrect struct {
		*model.QuizQuestion
		IsCorrect bool
	}

	questions := make([]*model.QuizQuestion, 0, len(record.Questions))
	correctList := make([]bool, 0, len(record.Questions))
	userAnswers := make([]string, 0, len(record.Questions))

	for i, q := range record.Questions {
		questions = append(questions, &q)
		userAns := ""
		if record.UserAnswers != nil {
			userAns = record.UserAnswers[strconv.Itoa(i)]
		}
		userAnswers = append(userAnswers, userAns)
		isCorrect := false
		if q.Type == "mcq" || q.Type == "fill" {
			isCorrect = userAns != "" && q.Answer != "" &&
				strings.EqualFold(strings.TrimSpace(userAns), strings.TrimSpace(q.Answer))
		} else if len(userAns) > 0 {
			isCorrect = true
		}
		correctList = append(correctList, isCorrect)
	}

	h.renderAdminPage(c, "答题详情", "quiz", "quiz-record-detail", gin.H{
		"User":        user,
		"Record":      record,
		"Questions":   questions,
		"Correct":     correctList,
		"UserAnswers": userAnswers,
		"AdminPath":   h.getDashboardPath(),
	}, "")
}

// ToggleFavoriteAPI 切换题目收藏状态 API
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) ToggleFavoriteAPI(c *gin.Context) {
	id := c.Param("id")
	err := resumeRepo.ToggleFavorite(id)
	if err != nil {
		Error(c, err.Error())
		return
	}
	OK(c, nil)
}

// DashboardNotFound 渲染后台 404 页面
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) DashboardNotFound(c *gin.Context) {
	c.Status(http.StatusNotFound)
	c.File("templates/admin/404.html")
}

// SettingsPage 渲染系统设置页
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) SettingsPage(c *gin.Context) {
	config := h.loadSettings()

	h.renderAdminPage(c, "系统设置", "settings", "settings", gin.H{
		"Config":    config,
		"AdminPath": h.getDashboardPath(),
	}, "")
}

// loadSettings 从数据库加载系统配置，不存在则返回默认值
// @return *model.SystemConfig 系统配置
// @author sunct
func (h *AdminHandler) loadSettings() *model.SystemConfig {
	config, err := resumeRepo.GetSystemConfig()
	if err != nil || config == nil {
		return &model.SystemConfig{
			ID:            "default",
			WebsiteDomain: "http://localhost:8090",
			WebsiteTitle:  "Resume Platform",
			AdminPageSize: 20,
		}
	}
	if config.AdminPageSize <= 0 {
		config.AdminPageSize = 20
	}
	return config
}

// getPageSize 获取后台列表分页大小
// @return int 每页条数
// @author sunct
func (h *AdminHandler) getPageSize() int {
	config := h.loadSettings()
	if config.AdminPageSize <= 0 {
		return 20
	}
	return config.AdminPageSize
}

// saveSettings 保存系统配置，确保始终只有一条记录（先清空再写入）
// @param config 系统配置
// @return error 保存错误
// @author sunct
func (h *AdminHandler) saveSettings(config *model.SystemConfig) error {
	config.ID = "default"

	existingConfig, err := resumeRepo.GetSystemConfig()
	if err != nil {
		return resumeRepo.CreateSystemConfig(config)
	}

	resumeRepo.CleanSystemConfig()

	config.CreatedAt = existingConfig.CreatedAt
	return resumeRepo.UpdateSystemConfig(config.ID, config)
}

// GetSettingsAPI 获取系统配置 API
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) GetSettingsAPI(c *gin.Context) {
	config := h.loadSettings()
	OK(c, config)
}

// UpdateSettingsAPI 更新系统配置 API，支持 Base64 格式 Logo 图片上传
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) UpdateSettingsAPI(c *gin.Context) {
	var config model.SystemConfig
	if err := c.ShouldBindJSON(&config); err != nil {
		BadRequest(c, "参数错误")
		return
	}

	if config.LogoPath != "" && strings.HasPrefix(config.LogoPath, "data:image/") {
		parts := strings.SplitN(config.LogoPath, ",", 2)
		if len(parts) == 2 {
			header := parts[0]
			data := parts[1]

			var ext string
			switch {
			case strings.Contains(header, "image/png"):
				ext = ".png"
			case strings.Contains(header, "image/jpeg"):
				ext = ".jpg"
			case strings.Contains(header, "image/jpg"):
				ext = ".jpg"
			case strings.Contains(header, "image/gif"):
				ext = ".gif"
			case strings.Contains(header, "image/webp"):
				ext = ".webp"
			default:
				ext = ".png"
			}

			logoPath := "./static/images/logo" + ext
			if err := os.MkdirAll("./static/images", 0755); err != nil {
				Error(c, "创建目录失败")
				return
			}

			decoded, err := base64.StdEncoding.DecodeString(data)
			if err != nil {
				BadRequest(c, "图片解码失败")
				return
			}

			if err := os.WriteFile(logoPath, decoded, 0644); err != nil {
				Error(c, "保存图片失败")
				return
			}

			config.LogoPath = "/static/images/logo" + ext
		}
	}

	if err := h.saveSettings(&config); err != nil {
		Error(c, "保存失败")
		return
	}

	Success(c, "设置保存成功")
}

// SystemInfoAPI 获取系统运行信息 API（Go版本、系统、运行时长等）
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) SystemInfoAPI(c *gin.Context) {
	OK(c, map[string]interface{}{
		"go_version": runtime.Version(),
		"os":         runtime.GOOS,
		"arch":       runtime.GOARCH,
		"start_time": h.startTime.Format("2006-01-02 15:04:05"),
		"uptime":     formatUptime(time.Since(h.startTime)),
	})
}

// LoginHistoryAPI 获取登录历史列表 API，支持分页
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) LoginHistoryAPI(c *gin.Context) {
	page := parseInt(c.Query("page"), 1)
	pageSize := parseInt(c.Query("pageSize"), 10)

	histories, total, err := resumeRepo.GetLoginHistory(page, pageSize)
	if err != nil {
		Error(c, "获取失败")
		return
	}

	OK(c, map[string]interface{}{
		"list":  histories,
		"total": total,
	})
}

// formatUptime 将时长格式化为中文友好显示（天/小时/分/秒）
// @param d 时间间隔
// @return string 格式化后的时长字符串
// @author sunct
func formatUptime(d time.Duration) string {
	days := int(d.Hours() / 24)
	hours := int(d.Hours()) % 24
	minutes := int(d.Minutes()) % 60
	seconds := int(d.Seconds()) % 60

	if days > 0 {
		return fmt.Sprintf("%d天 %d小时 %d分", days, hours, minutes)
	} else if hours > 0 {
		return fmt.Sprintf("%d小时 %d分 %d秒", hours, minutes, seconds)
	} else if minutes > 0 {
		return fmt.Sprintf("%d分 %d秒", minutes, seconds)
	} else {
		return fmt.Sprintf("%d秒", seconds)
	}
}

// UploadLogoAPI 上传网站 Logo 图片 API
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) UploadLogoAPI(c *gin.Context) {
	file, err := c.FormFile("logo")
	if err != nil {
		BadRequest(c, "请选择文件")
		return
	}

	ext := ""
	for i := len(file.Filename) - 1; i >= 0; i-- {
		if file.Filename[i] == '.' {
			ext = file.Filename[i:]
			break
		}
	}

	if ext == "" {
		BadRequest(c, "无效的文件格式")
		return
	}

	logoPath := "./static/images/logo" + ext
	if err := os.MkdirAll("./static/images", 0755); err != nil {
		Error(c, "创建目录失败")
		return
	}

	if err := c.SaveUploadedFile(file, logoPath); err != nil {
		Error(c, "保存文件失败")
		return
	}

	config := h.loadSettings()
	config.LogoPath = "/static/images/logo" + ext
	h.saveSettings(config)

	OK(c, gin.H{"logo_path": config.LogoPath}, "上传成功")
}

// SearchAPI 后台全局搜索 API，支持用户/简历/作品集三类搜索
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) SearchAPI(c *gin.Context) {
	query := c.Query("q")
	searchType := c.DefaultQuery("type", "all")

	if query == "" {
		OK(c, []interface{}{})
		return
	}

	var results []interface{}

	if searchType == "all" || searchType == "user" {
		users, _ := resumeRepo.GetAllUsers()
		for _, user := range users {
			if containsIgnoreCase(user.Name, query) || containsIgnoreCase(user.Email, query) || containsIgnoreCase(user.Username, query) {
				results = append(results, map[string]interface{}{
					"type":     "user",
					"title":    user.Name,
					"subtitle": user.Email,
					"url":      h.getDashboardPath() + "/user/" + user.ID + "/resume",
				})
			}
		}
	}

	if searchType == "all" || searchType == "resume" {
		resumes, _ := resumeRepo.GetAllResumes()
		for _, resume := range resumes {
			if containsIgnoreCase(resume.BasicInfo.Name, query) || containsIgnoreCase(resume.BasicInfo.Title, query) || containsIgnoreCase(resume.Route, query) {
				results = append(results, map[string]interface{}{
					"type":     "resume",
					"title":    resume.BasicInfo.Name + " - " + resume.BasicInfo.Title,
					"subtitle": resume.Route,
					"url":      h.getDashboardPath() + "/user/" + resume.UserID + "/resume/" + resume.ID + "/edit",
				})
			}
		}
	}

	if searchType == "all" || searchType == "portfolio" {
		items, _ := resumeRepo.GetPortfolioItems()
		for _, item := range items {
			if containsIgnoreCase(item.Name, query) || containsIgnoreCase(item.Description, query) {
				results = append(results, map[string]interface{}{
					"type":     "portfolio",
					"title":    item.Name,
					"subtitle": item.Description,
					"url":      h.getDashboardPath() + "/portfolio/" + strconv.FormatUint(uint64(item.ID), 10) + "/edit",
				})
			}
		}
	}

	OK(c, results)
}

// containsIgnoreCase 忽略大小写判断字符串是否包含子串
// @param str 源字符串
// @param substr 子串
// @return bool 是否包含
// @author sunct
func containsIgnoreCase(str, substr string) bool {
	for i := 0; i <= len(str)-len(substr); i++ {
		if strings.EqualFold(str[i:i+len(substr)], substr) {
			return true
		}
	}
	return false
}

// GetNotificationsAPI 获取系统通知列表 API
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) GetNotificationsAPI(c *gin.Context) {
	notifications, err := resumeRepo.GetNotifications()
	if err != nil {
		OK(c, []interface{}{})
		return
	}

	if notifications == nil {
		notifications = []*model.Notification{}
	}

	type notificationResp struct {
		ID      string `json:"id"`
		Type    string `json:"type"`
		Title   string `json:"title"`
		Message string `json:"message"`
		Time    string `json:"time"`
		Read    bool   `json:"read"`
		URL     string `json:"url"`
	}

	result := make([]notificationResp, 0, len(notifications))
	for _, n := range notifications {
		result = append(result, notificationResp{
			ID:      n.ID,
			Type:    n.Type,
			Title:   n.Title,
			Message: n.Message,
			Time:    formatRelativeTime(n.CreatedAt),
			Read:    n.IsRead,
			URL:     n.URL,
		})
	}

	OK(c, result)
}

// MarkNotificationAsReadAPI 标记单条通知为已读 API
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) MarkNotificationAsReadAPI(c *gin.Context) {
	id := c.Param("id")
	if err := resumeRepo.MarkNotificationAsRead(id); err != nil {
		Error(c, err.Error())
		return
	}
	Success(c, "标记成功")
}

// MarkAllNotificationsAsReadAPI 批量标记所有通知为已读 API
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) MarkAllNotificationsAsReadAPI(c *gin.Context) {
	if err := resumeRepo.MarkAllNotificationsAsRead(); err != nil {
		Error(c, err.Error())
		return
	}
	Success(c, "标记成功")
}

// DeleteAllNotificationsAPI 删除所有通知 API
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) DeleteAllNotificationsAPI(c *gin.Context) {
	if err := resumeRepo.DeleteAllNotifications(); err != nil {
		Error(c, err.Error())
		return
	}
	Success(c, "删除成功")
}

// GetUnreadNotificationCountAPI 获取未读通知数量 API
// @param c Gin 上下文
// @author sunct
func (h *AdminHandler) GetUnreadNotificationCountAPI(c *gin.Context) {
	count, _ := resumeRepo.GetUnreadNotificationCount()
	OK(c, map[string]interface{}{"count": count})
}

// formatRelativeTime 将时间字符串格式化为相对时间描述（刚刚/X分钟前/昨天等）
// @param t 时间字符串
// @return string 相对时间描述
// @author sunct
func formatRelativeTime(t string) string {
	if t == "" {
		return ""
	}
	t = strings.TrimSpace(t)
	layouts := []string{"2006-01-02 15:04:05", "2006-01-02T15:04:05", "2006-01-02 15:04", time.RFC3339}
	var nt time.Time
	var err error
	for _, layout := range layouts {
		nt, err = time.Parse(layout, t)
		if err == nil {
			break
		}
	}
	if err != nil {
		return t
	}

	diff := time.Since(nt)
	switch {
	case diff < time.Minute:
		return "刚刚"
	case diff < time.Hour:
		return fmt.Sprintf("%d分钟前", int(diff.Minutes()))
	case diff < 24*time.Hour:
		return fmt.Sprintf("%d小时前", int(diff.Hours()))
	case diff < 48*time.Hour:
		return "昨天"
	case diff < 30*24*time.Hour:
		return fmt.Sprintf("%d天前", int(diff.Hours()/24))
	default:
		return nt.Format("2006-01-02")
	}
}