package seal

import (
	"crypto"
	"net/url"
	"time"
)

type Type int

const (
	TypHighest = iota
	TypSecondHighest
)

// Auction describes the asset of an auction and other
// relevant meta-data
type Description struct {
	DashboardUrl    *url.URL // can be empty
	Start           time.Time
	End             time.Time
	RoundTimeout    time.Duration // Timeout per round by which all responses must have arrived
	BitLength       uint8         // Length of the price encoding
	Currency        string
	Type            Type
	SellerPublicKey crypto.PublicKey // Public key of the Seller
}

// The SignedAuction contains an Auction and the signature,
// signed by the seller's public key off the SHA512 hash of
// the normalized JSON-object.
// TODO(oec): normalized?
type SignedDesciption struct {
	Description
	SellerSignature string
}

// Auction is the simple interface for the engine
type Auction interface {
	Join(bidder Bidder)
	Received(msg []byte) error
}

// Bidder is the interface that the Auction engine uses to communicate
type Bidder interface {
	Result()
	Send(msg []byte, sig []byte) error
}