package middleware

import (
	"net/http"
	"strings"

	"github.com/gin-gonic/gin"
	"github.com/novablog/server/internal/utils"
)

// AuthMiddleware JWT 认证中间件
func AuthMiddleware(jwtManager *utils.JWTManager) gin.HandlerFunc {
	return func(c *gin.Context) {
		// 从 Header 获取 Token
		authHeader := c.GetHeader("Authorization")
		if authHeader == "" {
			c.JSON(http.StatusUnauthorized, gin.H{
				"error": "authorization header is required",
			})
			c.Abort()
			return
		}

		// 解析 Bearer Token
		parts := strings.SplitN(authHeader, " ", 2)
		if len(parts) != 2 || parts[0] != "Bearer" {
			c.JSON(http.StatusUnauthorized, gin.H{
				"error": "invalid authorization header format",
			})
			c.Abort()
			return
		}

		tokenString := parts[1]

		// 验证 Token
		claims, err := jwtManager.ParseToken(tokenString)
		if err != nil {
			c.JSON(http.StatusUnauthorized, gin.H{
				"error": err.Error(),
			})
			c.Abort()
			return
		}

		// 将用户信息存入上下文
		c.Set("userID", claims.UserID)
		c.Set("username", claims.Username)
		c.Set("role", claims.Role)

		c.Next()
	}
}

// AdminMiddleware 管理员权限中间件
func AdminMiddleware() gin.HandlerFunc {
	return func(c *gin.Context) {
		role, exists := c.Get("role")
		if !exists || role != "admin" {
			c.JSON(http.StatusForbidden, gin.H{
				"error": "admin permission required",
			})
			c.Abort()
			return
		}
		c.Next()
	}
}

// GetUserID 从上下文获取用户 ID
func GetUserID(c *gin.Context) (uint, bool) {
	userID, exists := c.Get("userID")
	if !exists {
		return 0, false
	}
	return userID.(uint), true
}

// GetUsername 从上下文获取用户名
func GetUsername(c *gin.Context) (string, bool) {
	username, exists := c.Get("username")
	if !exists {
		return "", false
	}
	return username.(string), true
}