package middleware

import (
	"net/http"
	"strings"

	"github.com/gin-gonic/gin"
	"github.com/zggsong/gin-vue-demo/common"
	"github.com/zggsong/gin-vue-demo/model"
)

// 认证中间件
func AuthMiddleWare() gin.HandlerFunc {
	return func(c *gin.Context) {
		// 获取 authorization header
		tokenString := c.GetHeader("Authorization")

		// 验证token
		if tokenString == "" || !strings.HasPrefix(tokenString, "Bearer ") {
			c.JSON(http.StatusUnauthorized, gin.H{
				"code":    http.StatusUnauthorized,
				"message": "请求未授权",
			})
			c.Abort()
			return
		}

		tokenString = tokenString[7:]

		token, claims, err := common.ParseToken(tokenString)
		if err != nil || !token.Valid {
			c.JSON(http.StatusUnauthorized, gin.H{
				"code":    http.StatusUnauthorized,
				"message": "请求未授权",
			})
			c.Abort()
			return
		}
		// 验证通过后获取Claim中的UserId
		userId := claims.UserId
		DB := common.GetDB()
		var user model.User
		DB.First(&user, userId)

		// 用户不存在
		if user.ID == 0 {
			c.JSON(http.StatusUnauthorized, gin.H{
				"code":    http.StatusUnauthorized,
				"message": "请求未授权",
			})
			c.Abort()
			return
		}

		// 用户信息存在，则将用户信息存入上下文
		c.Set("user", user)

		c.Next()
	}
}