package models

import (
	"github.com/golang-jwt/jwt"
	"github.com/google/uuid"
	"ms-auth/internal/lib"
)

type Session struct {
	Id     *string
	UserId *int32
}

func NewSession(userId int32) *Session {
	return &Session{
		Id:     lib.AsStringP(uuid.NewString()),
		UserId: &userId,
	}
}

func (s Session) Valid() error {
	if s.Id == nil {
		return lib.ErrBadSession
	}
	if s.UserId == nil {
		return lib.ErrBadSession
	}
	return nil
}

func (s Session) Token(secret string) (string, error) {
	if err := s.Valid(); err != nil {
		return "", err
	}
	refreshToken := jwt.NewWithClaims(jwt.SigningMethodHS256, s)
	str, err := refreshToken.SignedString([]byte(secret))
	if err != nil {
		return "", lib.ErrBadSession
	}
	return str, nil
}

func Parse(tkn string, secret string) (*Session, error) {
	parsedToken, err := jwt.ParseWithClaims(tkn, &Session{}, func(token *jwt.Token) (interface{}, error) {
		return []byte(secret), nil
	})
	if err != nil {
		return nil, lib.ErrBadSession
	}
	session := parsedToken.Claims.(*Session)
	if err = session.Valid(); err != nil {
		return nil, err
	}
	return session, nil
}