package brontide

import (
	"bytes"
	"net"
	"testing"

	"github.com/lightningnetwork/lnd/lnwire"
	"github.com/roasbeef/btcd/btcec"
)

func TestConnectionCorrectness(t *testing.T) {
	// First, generate the long-term private keys both ends of the connection
	// within our test.
	localPriv, err := btcec.NewPrivateKey(btcec.S256())
	if err != nil {
		t.Fatalf("unable to generate local priv key: %v", err)
	}
	remotePriv, err := btcec.NewPrivateKey(btcec.S256())
	if err != nil {
		t.Fatalf("unable to generate remote priv key: %v", err)
	}

	// Having a port of ":0" means a random port, and interface will be
	// chosen for our listener.
	addr := ":0"

	// Our listener will be local, and the connection remote.
	listener, err := NewListener(localPriv, addr)
	if err != nil {
		t.Fatalf("unable to create listener: %v", err)
	}
	defer listener.Close()

	netAddr := &lnwire.NetAddress{
		IdentityKey: localPriv.PubKey(),
		Address:     listener.Addr().(*net.TCPAddr),
	}

	// Initiate a connection with a separate goroutine, and listen with our
	// main one. If both errors are nil, then encryption+auth was succesful.
	errChan := make(chan error)
	connChan := make(chan net.Conn)
	go func() {
		conn, err := Dial(remotePriv, netAddr)
		errChan <- err
		connChan <- conn
	}()

	localConn, listenErr := listener.Accept()
	if listenErr != nil {
		t.Fatalf("unable to accept connection: %v", listenErr)
	}

	if dialErr := <-errChan; err != nil {
		t.Fatalf("unable to establish connection: %v", dialErr)
	}
	conn := <-connChan

	// Test out some message full-message reads.
	for i := 0; i < 10; i++ {
		msg := []byte("hello" + string(i))

		if _, err := conn.Write(msg); err != nil {
			t.Fatalf("remote conn failed to write: %v", err)
		}

		readBuf := make([]byte, len(msg))
		if _, err := localConn.Read(readBuf); err != nil {
			t.Fatalf("local conn failed to read: %v", err)
		}

		if !bytes.Equal(readBuf, msg) {
			t.Fatalf("messages don't match, %v vs %v",
				string(readBuf), string(msg))
		}
	}

	// Now try incremental message reads. This simulates first writing a
	// message header, then a message body.
	outMsg := []byte("hello world")
	if _, err := conn.Write(outMsg); err != nil {
		t.Fatalf("remote conn failed to write: %v", err)
	}

	readBuf := make([]byte, len(outMsg))
	if _, err := localConn.Read(readBuf[:len(outMsg)/2]); err != nil {
		t.Fatalf("local conn failed to read: %v", err)
	}
	if _, err := localConn.Read(readBuf[len(outMsg)/2:]); err != nil {
		t.Fatalf("local conn failed to read: %v", err)
	}

	if !bytes.Equal(outMsg, readBuf) {
		t.Fatalf("messages don't match, %v vs %v",
			string(readBuf), string(outMsg))
	}
}

func TestNoiseIdentityHiding(t *testing.T) {
	// TODO(roasbeef): fin
}