package routers

import (
	"fmt"
	"go_blog/controllers"
	"go_blog/controllers/admin"
	"net/http"
	"time"

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

// CheckAdminAuth 后台认证中间件（处理页面重定向）
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()
	}
}

// SessionAuthRequired 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) {
	// WebSocket 和 SSE 路由
	r.GET("/events", esSSE)
	r.GET("/ws", controllers.WebSocketHandler)

	// 内容相关路由
	r.POST("/content", controllers.CreateContentHandler)
	r.GET("/page", controllers.PageList)
	r.GET("/createcontent", controllers.CreateContentPage)

	// 前端路由（动态主题）
	r.GET("/", controllers.Home)
	r.GET("/post/:id", controllers.ShowPost)

	adminGroup := r.Group("/admin")
	adminGroup.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
		adminGroup.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")
		})

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

		// 需要认证的路由组
		authAdmin := adminGroup.Group("", SessionAuthRequired())
		{
			authAdmin.GET("/index", admin.ShowAdminIndexPage)
			authAdmin.GET("/themes", admin.ListThemes)
			authAdmin.POST("/themes/switch", admin.SwitchTheme)
			authAdmin.POST("/setpwd", admin.UsersSetPwdHandler)
			authAdmin.GET("/logout", admin.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", "*")

	flusher, ok := w.(http.Flusher)
	if !ok {
		c.String(http.StatusInternalServerError, "server not support SSE")
		return
	}

	for {
		fmt.Fprintf(w, "data: %s\n\n", time.Now().Format(time.Stamp))
		flusher.Flush()
		time.Sleep(1 * time.Second)
	}
}