package jwts

import (
   "fmt"
   "github.com/dgrijalva/jwt-go"
   "github.com/kataras/iris/v12"
   "strings"
   "time"
)



// 生成token
func (config *ClaimsConfigJson) TokenObtain() (string, error) {

   config.IssuedAt = time.Now().Unix()
   config.ExpiresAt = time.Now().Add(ExpireTime).Unix()

   token := jwt.NewWithClaims(jwt.SigningMethodHS256, config)
   signedToken, err := token.SignedString([]byte(SignKey))
   if err != nil {

      return "", err
   }
   return signedToken, nil
}

// =======================

// 重新整理token
func (config *ClaimsConfigJson) tokenRefresh(ctx iris.Context) {
   jwtObj := ctx.GetHeader("Authorization")
   if jwtObj == "" {
      _, _ = ctx.JSON("未登入或已失效")
      return
   }
   StrToken := strings.Split(jwtObj, " ")[1]
   token, err := jwt.ParseWithClaims(StrToken, &ClaimsConfigJson{}, func(token *jwt.Token) (interface{}, error) {
      return []byte(SignKey), nil
   })
   if err != nil {
      println(err)
      return
   }
   claims, ok := token.Claims.(*ClaimsConfigJson)
   if !ok {
      println("test")
      return
   }
   if err := token.Claims.Valid(); err != nil {
      println(err)
      return
   }
   claims.UserId = config.UserId
   claims.ExpiresAt = time.Now().Unix() + (claims.ExpiresAt - claims.IssuedAt)

   newToken := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
   signedToken, err := newToken.SignedString([]byte(SignKey))
   if err != nil {
      println(err)
      return
   }
   fmt.Println(signedToken)
}

// =====================

// 路由中介軟體
func JwtHandle(ctx iris.Context) {
   jwtObj := ctx.GetHeader("Authorization")
   if jwtObj == "" {
      _, _ = ctx.JSON("未登入或已失效")
      return
   }
   jwtStr := strings.Split(jwtObj, " ")[1]

   token, err := jwt.ParseWithClaims(jwtStr, &ClaimsConfigJson{}, func(token *jwt.Token) (interface{}, error) {
      return []byte(SignKey), nil
   })
   if err != nil {
      _, _ = ctx.JSON("令牌已過期")
      return
   }
   claims, ok := token.Claims.(*ClaimsConfigJson)
   if !ok {
      _, _ = ctx.JSON("解析使用者資料錯誤")
      return
   }
   if err := token.Claims.Valid(); err != nil {
      _, _ = ctx.JSON("令牌已失效")
      return
   }
   ctx.Values().Set(DataKey, claims)
   ctx.Next()
}