package main

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

type OAuthConfig struct {
	HostName  string
	PublicKey ed25519.PublicKey
}

type Backend struct {
	oauthConfig OAuthConfig
}

func (be *Backend) Login(_ *imap.ConnInfo, username, token string) (backend.User, error) {
	sub, err := Authenticate(token, be.oauthConfig)
	if err != nil {
		return nil, err
	}

	username, err = GetUsername(token, be.oauthConfig)
	if err != nil {
		return nil, err
	}

	user := &User{
		username:     username,
		sub:          sub,
		openMessages: make(map[*Message]struct{}),
	}

	_, err = user.GetMailbox("INBOX")
	if err != nil {
		err := user.CreateMailbox("INBOX")
		if err != nil {
			return nil, err
		}
	}

	return user, nil
}