package casdoor_middleware

import (
	"log"
	"net/http"
	"strings"

	"autolibrary.top/webserver/config"

	"github.com/casdoor/casdoor-go-sdk/casdoorsdk"
	"github.com/gin-gonic/gin"
)

func CasdoorAuth() gin.HandlerFunc {
	cfg := config.GetConfig()

	return func(c *gin.Context) {
		// If Casdoor is not configured, return 501 Not Implemented
		if cfg.Backend.Casdoor.Endpoint == "" || cfg.Backend.Casdoor.ClientID == "" {
			c.JSON(http.StatusNotImplemented, gin.H{
				"code": http.StatusNotImplemented,
				"msg":  "AUTH > Casdoor authentication is not configured on this server",
				"data": nil,
			})
			c.Abort()
			return
		}

		authHeader := c.GetHeader("Authorization")
		if authHeader == "" {
			c.JSON(http.StatusUnauthorized, gin.H{
				"code": http.StatusUnauthorized,
				"msg":  "AUTH > missing Authorization header",
				"data": nil,
			})
			c.Abort()
			return
		}

		token := strings.TrimPrefix(authHeader, "Bearer ")
		if token == authHeader {
			c.JSON(http.StatusUnauthorized, gin.H{
				"code": http.StatusUnauthorized,
				"msg":  "AUTH > Authorization header must be Bearer <token>",
				"data": nil,
			})
			c.Abort()
			return
		}

		claims, err := casdoorsdk.ParseJwtToken(token)
		if err != nil {
			log.Printf("[W] AUTH > invalid JWT token: %v", err)
			c.JSON(http.StatusUnauthorized, gin.H{
				"code": http.StatusUnauthorized,
				"msg":  "AUTH > invalid or expired token",
				"data": nil,
			})
			c.Abort()
			return
		}

		c.Set("user_id", claims.User.Id)
		c.Set("user_name", claims.User.Name)
		c.Set("display_name", claims.User.DisplayName)
		c.Set("is_admin", claims.User.IsAdmin)
		c.Set("user_tag", claims.User.Tag)
		c.Next()
	}
}

// CasdoorAdminAuth requires both valid Casdoor JWT and admin privileges
func CasdoorAdminAuth() gin.HandlerFunc {
	auth := CasdoorAuth()
	return func(c *gin.Context) {
		auth(c)
		if c.IsAborted() {
			return
		}
		isAdmin, _ := c.Get("is_admin")
		if isAdmin == nil || !isAdmin.(bool) {
			c.JSON(http.StatusForbidden, gin.H{
				"code": http.StatusForbidden,
				"msg":  "AUTH > admin privileges required",
				"data": nil,
			})
			c.Abort()
			return
		}
		c.Next()
	}
}