package hotline

import (
	"encoding/binary"
	"github.com/jhalter/mobius/concat"
)

const GuestAccount = "guest" // default account used when no login is provided for a connection

type Account struct {
	Login    string  `yaml:"Login"`
	Name     string  `yaml:"Name"`
	Password string  `yaml:"Password"`
	Access   *[]byte `yaml:"Access"` // 8 byte bitmap
}

// Payload marshals an account to byte slice
// Example:
//	00 04 // fieldCount?
//	00 66 // 102 - fieldUserName
//	00 0d // 13
//	61 64 6d 69 6e 69 73 74 72 61 74 6f 72 // administrator
//	00 69 // 105 fieldUserLogin (encoded)
//	00 05 // len
//	9e 9b 92 96 91 // encoded login name
//	00 6a // 106 fieldUserPassword
//	00 01  // len
//	78
//	00 6e  // fieldUserAccess
//	00 08
//	ff d3 cf ef ff 80 00 00
func (a *Account) Payload() (out []byte) {
	nameLen := make([]byte, 2)
	binary.BigEndian.PutUint16(nameLen, uint16(len(a.Name)))

	loginLen := make([]byte, 2)
	binary.BigEndian.PutUint16(loginLen, uint16(len(a.Login)))

	return concat.Slices(
		[]byte{0x00, 0x3}, // param count -- always 3

		[]byte{0x00, 0x66}, // fieldUserName
		nameLen,
		[]byte(a.Name),

		[]byte{0x00, 0x69}, // fieldUserLogin
		loginLen,
		[]byte(NegatedUserString([]byte(a.Login))),

		[]byte{0x00, 0x6e}, // fieldUserAccess
		[]byte{0x00, 0x08},
		*a.Access,
	)
}