package handshake_test

import (
	"bytes"
	"crypto/ecdsa"
	"log"
	"net"
	"sync"
	"testing"

	"koti.casa/numenor-labs/dsfx/pkg/dcrypto"
	"koti.casa/numenor-labs/dsfx/pkg/handshake"
)

func TestHandshake(t *testing.T) {
	var wg sync.WaitGroup

	client, server := net.Pipe()
	defer client.Close()
	defer server.Close()

	alice := newActor()
	bob := newActor()

	var aliceSharedSecret []byte
	var aliceErr error
	var bobSharedSecret []byte
	var bobErr error

	wg.Add(2)
	go func() {
		aliceSharedSecret, aliceErr = handshake.InitiateHandshake(alice, client, &bob.IdentityKey().PublicKey)
		wg.Done()
	}()
	go func() {
		bobSharedSecret, bobErr = handshake.AcceptHandshake(bob, server)
		wg.Done()
	}()

	wg.Wait()

	if aliceErr != nil || bobErr != nil {
		if aliceErr != nil {
			t.Errorf("alice error: %v", aliceErr)
			return
		}
		t.Errorf("bob error: %v", bobErr)
		return
	}

	if aliceSharedSecret == nil || bobSharedSecret == nil {
		t.Errorf("handshake failed: shared secret is nil")
		return
	}
	if len(aliceSharedSecret) == 0 || len(bobSharedSecret) == 0 {
		t.Errorf("handshake failed: shared secret is empty")
	}
	if !bytes.Equal(aliceSharedSecret, bobSharedSecret) {
		t.Errorf("handshake failed: shared secrets do not match")
		return
	}
}

// An actor represents an entity that can participate in the handshake process.
type actor struct {
	identity *ecdsa.PrivateKey
}

// newActor creates a new actor with a random identity key.
func newActor() *actor {
	key, err := dcrypto.GenerateSigningKey()
	if err != nil {
		log.Fatal(err)
	}

	return &actor{
		identity: key,
	}
}

// IdentityKey ...
func (a *actor) IdentityKey() *ecdsa.PrivateKey {
	return a.identity
}

// Address returns the address of the actor. This is used when listening for
// incoming connections, and when dialing out to other actors.
func (a *actor) Address() *net.TCPAddr {
	return nil
}