package garage

import (
	"crypto/ed25519"
	"encoding/hex"
	"fmt"
	"net"
	"strconv"
)

// Peer describes all information necessary to connect to a given garage node.
type Peer struct {
	IP        string
	RPCPort   int
	S3APIPort int
}

// RPCPeerKey deterministically generates a public/private keys which can
// be used as a garage node key.
//
// DANGER: This function will deterministically produce public/private keys
// given some arbitrary input. This is NEVER what you want. It's only being used
// in cryptic-net for a very specific purpose for which I think it's ok and is
// very necessary, and people are probably _still_ going to yell at me.
//
func (p Peer) RPCPeerKey() (pubKey, privKey []byte) {
	input := []byte(net.JoinHostPort(p.IP, strconv.Itoa(p.RPCPort)))

	// Append the length of the input to the input, so that the input "foo"
	// doesn't generate the same key as the input "foofoo".
	input = strconv.AppendInt(input, int64(len(input)), 10)

	pubKey, privKey, err := ed25519.GenerateKey(NewInfiniteReader(input))
	if err != nil {
		panic(err)
	}

	return pubKey, privKey
}

// RPCPeerID returns the peer ID of the garage node for use in communicating
// over RPC.
//
// DANGER: See warning on RPCPeerKey.
func (p Peer) RPCPeerID() string {
	pubKey, _ := p.RPCPeerKey()
	return hex.EncodeToString(pubKey)
}

// RPCAddr returns the address of the peer's RPC port.
func (p Peer) RPCAddr() string {
	return net.JoinHostPort(p.IP, strconv.Itoa(p.RPCPort))
}

// RPCPeerAddr returns the full peer address (e.g. "id@ip:port") of the garage
// node for use in communicating over RPC.
//
// DANGER: See warning on RPCPeerKey.
func (p Peer) RPCPeerAddr() string {
	return fmt.Sprintf("%s@%s", p.RPCPeerID(), p.RPCAddr())
}

// S3APIAddr returns the address of the peer's S3 API port.
func (p Peer) S3APIAddr() string {
	return net.JoinHostPort(p.IP, strconv.Itoa(p.S3APIPort))
}