package routers // Add the package declaration at the top

import (
	"fmt"
	"go_blog/controllers"
	"go_blog/models"
	"go_blog/serializers"
	"go_blog/themes" // <-- 确保导入 themes 包
	"log"
	"net/http"
	"strconv"
	"time"

	"github.com/gin-contrib/sessions"
	"github.com/gin-gonic/gin"
	"gorm.io/gorm"
)

// 新增：自定义后台认证中间件（处理页面重定向）
// 自定义后台认证中间件（通过Session判断登录状态）
func CheckAdminAuth() gin.HandlerFunc {
	return func(c *gin.Context) {
		currentPath := c.Request.URL.Path
		session := sessions.Default(c)   // 获取当前请求的Session
		userID := session.Get("user_id") // 从Session中获取用户ID
		loggedIn := userID != nil && userID != ""

		// 已登录状态访问登录/注册页：重定向到后台首页
		if (currentPath == "/admin/login" || currentPath == "/admin/register") && loggedIn {
			c.Redirect(http.StatusFound, "/admin/index")
			c.Abort()
			return
		}

		// 未登录状态访问非登录/注册页：重定向到登录页
		if (currentPath != "/admin/login" && currentPath != "/admin/register") && !loggedIn {
			c.Redirect(http.StatusFound, "/admin/login")
			c.Abort()
			return
		}

		c.Next()
	}
}

// 新增：基于Session的认证中间件
func SessionAuthRequired() gin.HandlerFunc {
	return func(c *gin.Context) {
		session := sessions.Default(c)
		userID := session.Get("user_id")
		if userID == nil {
			// 未登录，重定向到登录页
			c.Redirect(http.StatusFound, "/admin/login")
			c.Abort()
			return
		}
		// 可选：根据userID查询用户信息并注入上下文
		// user, err := models.GetAccountByID(userID.(uint))
		// if err != nil { ... }
		// c.Set("user", user)
		c.Next()
	}
}

func RegisterRoutes(r *gin.Engine) {

	// 注册WebSocket路由
	r.GET("/events", esSSE)

	r.GET("/page", func(c *gin.Context) {
		tm, exists := c.Get("ThemeManager")
		if !exists {
			c.String(http.StatusInternalServerError, "Theme manager not found")
			return
		}
		themeManager, ok := tm.(*themes.ThemeManager)
		if !ok {
			c.String(http.StatusInternalServerError, "Invalid theme manager type")
			return
		}

		var items []models.Content
		var pager serializers.Pager
		pager.InitPager(c) // 这会从查询参数中读取 page 和 pageSize
		offset := (pager.Page - 1) * pager.PageSize

		dbInterface, dbOk := c.Get("DB")
		if !dbOk {
			log.Println("未找到键 'DB' 的上下文值")
			c.JSON(http.StatusInternalServerError, gin.H{"error": "内部服务器错误"})
			return
		}
		db, typeOk := dbInterface.(*gorm.DB)
		if !typeOk {
			log.Println("无法将 DB 转换为 *gorm.DB 类型")
			c.JSON(http.StatusInternalServerError, gin.H{"error": "内部服务器错误"})
			return
		}

		db.Select("*").Offset(offset).Limit(pager.PageSize).Find(&items, "type = ?", "post")
		var totalCount int64
		db.Model(&models.Content{}).Where("type = ?", "post").Count(&totalCount)
		pager.Total = int(totalCount) // 确保 Pager 结构体中的 Total 类型匹配

		tpl := themeManager.GetTemplate("index") // 假设分页列表也使用 index 模板
		if tpl == nil {
			c.String(http.StatusInternalServerError, "Template 'index' not found in current theme: "+themeManager.CurrentTheme())
			return
		}

		c.Status(http.StatusOK)
		c.Header("Content-Type", "text/html; charset=utf-8")
		err := tpl.Execute(c.Writer, gin.H{
			"Items": items,
			"Pager": pager, // 确保你的 index.tmpl 支持 Pager 结构
			"Title": "文章列表 - 第 " + strconv.Itoa(pager.Page) + " 页",
		})
		if err != nil {
			c.String(http.StatusInternalServerError, "Error rendering template: "+err.Error())
		}
	})

	r.GET("/createcontent", func(c *gin.Context) {
		tm, exists := c.Get("ThemeManager")
		if !exists {
			c.String(http.StatusInternalServerError, "Theme manager not found")
			return
		}
		themeManager, ok := tm.(*themes.ThemeManager)
		if !ok {
			c.String(http.StatusInternalServerError, "Invalid theme manager type")
			return
		}

		// 假设你的主题中有一个名为 "content" 的模板 (content.html 或 content.tmpl)
		// 注意：当前的 default 主题并没有 content.tmpl，你需要添加它。
		// 如果这个页面是后台页面，它可能不需要主题化，或者使用一个固定的后台模板。
		tpl := themeManager.GetTemplate("content")
		if tpl == nil {
			c.String(http.StatusInternalServerError, "Template 'content' not found in current theme: "+themeManager.CurrentTheme()+". Make sure 'content.html' or 'content.tmpl' exists.")
			return
		}

		c.Status(http.StatusOK)
		c.Header("Content-Type", "text/html; charset=utf-8")
		err := tpl.Execute(c.Writer, gin.H{
			"Title": "创建新内容",
		})
		if err != nil {
			c.String(http.StatusInternalServerError, "Error rendering template: "+err.Error())
		}
	})

	r.GET("/ws", controllers.WebSocketHandler)
	r.POST("/content", controllers.CreateContentHandler)
	// Frontend routes (dynamic themes)
	r.GET("/", controllers.Home)
	r.GET("/post/:id", controllers.ShowPost)

	admin := r.Group("/admin")
	admin.Use(CheckAdminAuth())
	{
		// 无需认证的公开路由（登录/注册）
		// 新增：处理 /admin 根路径跳转
		admin.GET("/", func(c *gin.Context) {
			// 由于 CheckAdminAuth 中间件已处理未登录场景，此处用户必定已登录
			c.Redirect(http.StatusFound, "/admin/index")
		})

		admin.GET("/login", controllers.ShowLoginPage)
		admin.GET("/register", controllers.ShowRegisterPage)
		admin.POST("/login", controllers.UsersLoginHandler)
		admin.POST("/register", controllers.UsersRegisterHandler)

		// 需要认证的路由组
		authAdmin := admin.Group("", SessionAuthRequired())
		{
			authAdmin.GET("/index", controllers.ShowAdminIndexPage)
			authAdmin.GET("/themes", controllers.ListThemes)
			authAdmin.POST("/themes/switch", controllers.SwitchTheme)
			authAdmin.POST("/setpwd", controllers.UsersSetPwdHandler)
			admin.GET("/logout", controllers.UsersLogoutHandler) // 添加退出路由
		}
	}

	// Static files for themes
	r.StaticFS("/themes", http.Dir("web/themes"))
}

func esSSE(c *gin.Context) {
	w := c.Writer

	w.Header().Set("Content-Type", "text/event-stream")
	w.Header().Set("Cache-Control", "no-cache")
	w.Header().Set("Connection", "keep-alive")
	w.Header().Set("Access-Control-Allow-Origin", "*")

	_, ok := w.(http.Flusher)

	if !ok {
		log.Panic("server not support") //浏览器不兼容
	}

	for {
		// Simulate sending events every second
		fmt.Fprintf(w, "data: %s\n\n", time.Now().Format(time.Stamp))
		w.(http.Flusher).Flush()
		time.Sleep(1 * time.Second)
	}

	_, err := fmt.Fprintf(w, "event: connecttime\ndata: %s\n\n", "connecttime")
	if err != nil {
		print("error", err)
		return
	}
}