package handler

import (
	"net/http"

	"github.com/gin-gonic/gin"
	"note-manager/middleware"
	"note-manager/service"
)

// AdminHandler 后台管理处理器（登录页与页面跳转，多租户账号认证）
type AdminHandler struct {
	userSvc *service.UserService
}

// NewAdminHandler 创建后台管理处理器
func NewAdminHandler(userSvc *service.UserService) *AdminHandler {
	return &AdminHandler{userSvc: userSvc}
}

// LoginPage 登录页面
func (h *AdminHandler) LoginPage(c *gin.Context) {
	c.HTML(http.StatusOK, "login.html", gin.H{
		"title": "后台管理登录",
	})
}

// Login 验证登录（用户名 + 密码，兼容 JSON 与 form）
func (h *AdminHandler) Login(c *gin.Context) {
	username := c.PostForm("username")
	password := c.PostForm("password")
	if username == "" && password == "" {
		// 尝试 JSON
		var req struct {
			Username string `json:"username"`
			Password string `json:"password"`
		}
		if err := c.ShouldBindJSON(&req); err == nil {
			username = req.Username
			password = req.Password
		}
	}
	u, err := h.userSvc.Login(username, password)
	if err != nil {
		c.JSON(http.StatusUnauthorized, gin.H{
			"code":    401,
			"message": err.Error(),
		})
		return
	}
	token, _ := middleware.NewSession(u.ID)
	secure := c.Request.TLS != nil
	middleware.SetAuthCookie(c, token, secure)
	c.JSON(http.StatusOK, gin.H{
		"code":    0,
		"message": "登录成功",
	})
}

// Logout 登出
func (h *AdminHandler) Logout(c *gin.Context) {
	middleware.RevokeSession(middleware.GetAuthToken(c))
	middleware.ClearAuthCookie(c)
	c.JSON(http.StatusOK, gin.H{
		"code":    0,
		"message": "已退出登录",
	})
}

// CheckAuth 检查是否已登录
func (h *AdminHandler) CheckAuth(c *gin.Context) {
	token := middleware.GetAuthToken(c)
	if middleware.IsValidSession(token) {
		c.JSON(http.StatusOK, gin.H{
			"code":    0,
			"message": "已登录",
			"data": gin.H{
				"authenticated": true,
			},
		})
		return
	}
	c.JSON(http.StatusOK, gin.H{
		"code":    0,
		"message": "未登录",
		"data": gin.H{
			"authenticated": false,
		},
	})
}

// IndexPage 后台管理首页（需登录，否则跳转登录页）
func (h *AdminHandler) IndexPage(c *gin.Context) {
	token := middleware.GetAuthToken(c)
	if !middleware.IsValidSession(token) {
		c.Redirect(http.StatusFound, "/admin/login")
		return
	}
	c.HTML(http.StatusOK, "index.html", gin.H{
		"title": "笔记管理后台",
	})
}