package authboss

import "net/http"

const (
	// SessionKey is the primarily used key by authboss.
	SessionKey = "uid"
	// HalfAuthKey is used for sessions that have been authenticated by
	// the remember module. This serves as a way to force full authentication
	// by denying half-authed users acccess to sensitive areas.
	SessionHalfAuthKey = "halfauth"
	// FlashSuccessKey is used for storing sucess flash messages on the session
	FlashSuccessKey = "flash_success"
	// FlashErrorKey is used for storing sucess flash messages on the session
	FlashErrorKey = "flash_error"
)

// ClientStorer should be able to store values on the clients machine. Cookie and
// Session storers are built with this interface.
type ClientStorer interface {
	Put(key, value string)
	Get(key string) (string, bool)
	Del(key string)
}

// ClientStorerErr is a wrapper to return error values from failed Gets.
type ClientStorerErr interface {
	ClientStorer
	GetErr(key string) (string, error)
}

type clientStoreWrapper struct {
	ClientStorer
}

// GetErr returns a value or an error.
func (c clientStoreWrapper) GetErr(key string) (string, error) {
	str, ok := c.Get(key)
	if !ok {
		return str, ClientDataErr{key}
	}

	return str, nil
}

// CookieStoreMaker is used to create a cookie storer from an http request. Keep in mind
// security considerations for your implementation, Secure, HTTP-Only, etc flags.
type CookieStoreMaker func(http.ResponseWriter, *http.Request) ClientStorer

// SessionStoreMaker is used to create a session storer from an http request.
// It must be implemented to satisfy certain modules (auth, remember primarily).
// It should be a secure storage of the session. This means if it represents a cookie-based session
// storage these cookies should be signed in order to prevent tampering, or they should be encrypted.
type SessionStoreMaker func(http.ResponseWriter, *http.Request) ClientStorer