package ftpserver

import (
	"crypto/tls"
	"fmt"

	ftpserver "github.com/fclairamb/ftpserverlib"
	"github.com/spf13/afero"
)

type driver struct {
	User, Pass string
	ListenAddr string

	ClientDriver afero.Fs
}

// GetSettings returns some general settings around the server setup
func (d *driver) GetSettings() (*ftpserver.Settings, error) {
	//log.Printf("Passed settings to ftpserverlib.")

	return &ftpserver.Settings{
		ListenAddr:          d.ListenAddr,
		DefaultTransferType: ftpserver.TransferTypeBinary,
	}, nil
}

// ClientConnected is called to send the very first welcome message
func (d *driver) ClientConnected(cc ftpserver.ClientContext) (string, error) {
	//log.Printf("Client %q connected.", cc.RemoteAddr())

	return "Welcome to the Scanyonero FTP server.", nil
}

// ClientDisconnected is called when the user disconnects, even if he never authenticated
func (d *driver) ClientDisconnected(cc ftpserver.ClientContext) {
	//log.Printf("Client %q disconnected.", cc.RemoteAddr())
}

// AuthUser authenticates the user and selects an handling driver
func (d *driver) AuthUser(cc ftpserver.ClientContext, user, pass string) (ftpserver.ClientDriver, error) {
	if d.User != "" && d.Pass != "" {
		if user != d.User || pass != d.Pass {
			return nil, fmt.Errorf("wrong username or password")
		}
	}

	//log.Printf("Client %q authenticated with %q and %q.", cc.RemoteAddr(), user, pass)

	return d.ClientDriver, nil
}

// GetTLSConfig returns a TLS Certificate to use
// The certificate could frequently change if we use something like "let's encrypt"
func (d *driver) GetTLSConfig() (*tls.Config, error) {
	return nil, fmt.Errorf("tls not implemented")
}