package signer

import (
	pb "github.com/docker/notary/proto"
	"github.com/docker/notary/signer/keys"
)

// SigningService is the interface to implement a key management and signing service
type SigningService interface {
	KeyManager

	// Signer returns a Signer for a given keyID
	Signer(keyID *pb.KeyID) (Signer, error)
}

// SigningServiceIndex represents a mapping between a service algorithm string
// and a signing service
type SigningServiceIndex map[string]SigningService

// KeyManager is the interface to implement key management (possibly a key database)
type KeyManager interface {
	// CreateKey creates a new key and returns it's Information
	CreateKey() (*pb.PublicKey, error)

	// DeleteKey removes a key
	DeleteKey(keyID *pb.KeyID) (*pb.Void, error)

	// KeyInfo returns the public key of a particular key
	KeyInfo(keyID *pb.KeyID) (*pb.PublicKey, error)
}

// Signer is the interface that allows the signing service to return signatures
type Signer interface {
	Sign(request *pb.SignatureRequest) (*pb.Signature, error)
}

// KeyDatabase is the interface that allows the implementation of multiple database backends
type KeyDatabase interface {
	KeyManager

	// GetKey returns the private key to do signing operations
	GetKey(keyID *pb.KeyID) (*keys.Key, error)

	// AddKey allows the direct addition and removal of keys from the database
	AddKey(key *keys.Key) error
}