package main

import (
	"crypto/ed25519"
	"github.com/emersion/go-imap/v2/imapserver"
)

// OAuthConfig is the configuration for OAuth.
type OAuthConfig struct {
	HostName  string
	PublicKey ed25519.PublicKey
}

// Server is a server instance.
//
// A server contains a list of users.
type Server struct {
	config OAuthConfig
}

// New creates a new server.
func New(config OAuthConfig) *Server {
	return &Server{
		config: config,
	}
}

// NewSession creates a new IMAP session.
func (s *Server) NewSession() imapserver.Session {
	return &serverSession{
		server: s,
		UserSession: &UserSession{
			user: &User{
				server: s,
			},
			mailbox: nil,
		},
	}
}

type serverSession struct {
	*UserSession // may be nil

	server *Server // immutable
}

var _ imapserver.Session = (*serverSession)(nil)

func (sess *serverSession) SLogin(username, token string) error {
	sess.user = &User{server: sess.server}
	err := sess.user.Login(username, token)
	if err != nil {
		return err
	}

	return nil
}