package middleware

import (
	"context"
	"errors"
	"net/http"
	"slowwildws/internal/constants"

	"github.com/golang-jwt/jwt"
	xhttp "github.com/zeromicro/x/http"
)

// 自定义 Claims 类型
type MyCustomClaims struct {
	UserAuthID int64 `json:"user_id"`
	jwt.StandardClaims
}

type JwtMiddleware struct {
	Secret string
}

func NewJwtMiddleware(secret string) *JwtMiddleware {
	return &JwtMiddleware{
		Secret: secret,
	}
}

func (j *JwtMiddleware) Handle(next http.HandlerFunc) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		var authToken string
		if authToken = r.Header.Get("Sec-Websocket-Protocol"); authToken != "" {
			r.Header.Set("Authorization", authToken)
		}
		parseToken, err := jwt.ParseWithClaims(authToken, &MyCustomClaims{}, func(t *jwt.Token) (interface{}, error) {
			return []byte(j.Secret), nil
		})
		if err != nil {
			w.WriteHeader(http.StatusUnauthorized)
			xhttp.JsonBaseResponseCtx(r.Context(), w, errors.New("token invalid"))
			return
		}
		if !parseToken.Valid {
			w.WriteHeader(http.StatusUnauthorized)
			xhttp.JsonBaseResponseCtx(r.Context(), w, errors.New("token invalid"))
			return
		}
		claims, ok := parseToken.Claims.(*MyCustomClaims)
		if !ok {
			w.WriteHeader(http.StatusUnauthorized)
			xhttp.JsonBaseResponseCtx(r.Context(), w, errors.New("parse token invalid"))
			return
		}
		*r = *r.WithContext(context.WithValue(r.Context(), constants.UserID, claims.UserAuthID))
		next(w, r)
	}
}