package bip32

import "crypto/rand"

// GenerateSeed generates seed that can be used to initialize a master key.
func GenerateSeed() ([]byte, error) {
	randBytes := make([]byte, 32)
	_, err := rand.Read(randBytes)
	if err != nil {
		return nil, err
	}

	return randBytes, nil
}

// NewMasterWithPath returns a new master key based on the given seed and version, with a derivation
// to the given path.
func NewMasterWithPath(seed []byte, version [4]byte, pathString string) (*ExtendedKey, error) {
	masterKey, err := NewMaster(seed, version)
	if err != nil {
		return nil, err
	}

	return masterKey.DeriveFromPath(pathString)
}

// NewPublicMasterWithPath returns a new public master key based on the given seed and version, with a derivation
// to the given path.
func NewPublicMasterWithPath(seed []byte, version [4]byte, pathString string) (*ExtendedKey, error) {
	masterKey, err := NewMaster(seed, version)
	if err != nil {
		return nil, err
	}

	path, err := parsePath(pathString)
	if err != nil {
		return nil, err
	}

	descendantKey, err := masterKey.path(path)
	if err != nil {
		return nil, err
	}

	return descendantKey.Public()
}