package yggdrasil

import (
	"bytes"
	"math/rand"
	"os"
	"testing"
	"time"

	"github.com/gologme/log"

	"github.com/yggdrasil-network/yggdrasil-go/src/config"
)

// GenerateConfig is modification
func GenerateConfig() *config.NodeConfig {
	cfg := config.GenerateConfig()
	cfg.AdminListen = "none"
	cfg.Listen = []string{"tcp://127.0.0.1:0"}
	cfg.IfName = "none"

	return cfg
}

func GetLoggerWithPrefix(prefix string) *log.Logger {
	l := log.New(os.Stderr, prefix, log.Flags())
	l.EnableLevel("info")
	l.EnableLevel("warn")
	l.EnableLevel("error")
	return l
}

func CreateAndConnectTwo(t *testing.T) (*Core, *Core) {
	nodeA := Core{}
	_, err := nodeA.Start(GenerateConfig(), GetLoggerWithPrefix("A: "))
	if err != nil {
		t.Fatal(err)
	}

	nodeB := Core{}
	_, err = nodeB.Start(GenerateConfig(), GetLoggerWithPrefix("B: "))
	if err != nil {
		t.Fatal(err)
	}

	err = nodeB.AddPeer("tcp://"+nodeA.link.tcp.getAddr().String(), "")
	if err != nil {
		t.Fatal(err)
	}

	if l := len(nodeA.GetPeers()); l != 1 {
		t.Fatal("unexpected number of peers", l)
	}
	if l := len(nodeB.GetPeers()); l != 1 {
		t.Fatal("unexpected number of peers", l)
	}

	return &nodeA, &nodeB
}

func TestCore_Start_Connect(t *testing.T) {
	CreateAndConnectTwo(t)
}

func TestCore_Start_Transfer(t *testing.T) {
	nodeA, nodeB := CreateAndConnectTwo(t)

	// Listen
	listener, err := nodeA.ConnListen()
	if err != nil {
		t.Fatal(err)
	}
	defer listener.Close()

	done := make(chan struct{})
	go func() {
		conn, err := listener.Accept()
		if err != nil {
			t.Error(err)
			return
		}
		defer conn.Close()
		buf := make([]byte, 64)
		n, err := conn.Read(buf)
		if err != nil {
			t.Error(err)
			return
		}
		if n != 64 {
			t.Error("missing data")
			return
		}
		_, err = conn.Write(buf)
		if err != nil {
			t.Error(err)
		}
		done <- struct{}{}
	}()

	time.Sleep(3 * time.Second) // FIXME
	// Dial
	dialer, err := nodeB.ConnDialer()
	if err != nil {
		t.Fatal(err)
	}
	t.Log(nodeA.GetSwitchPeers())
	t.Log(nodeB.GetSwitchPeers())
	t.Log(nodeA.GetSessions())
	t.Log(nodeB.GetSessions())
	conn, err := dialer.Dial("nodeid", nodeA.NodeID().String())
	if err != nil {
		t.Fatal(err)
	}
	defer conn.Close()
	msg := make([]byte, 64)
	rand.Read(msg)
	conn.Write(msg)
	if err != nil {
		t.Fatal(err)
	}
	buf := make([]byte, 64)
	_, err = conn.Read(buf)
	if err != nil {
		t.Fatal(err)
	}
	if bytes.Compare(msg, buf) != 0 {
		t.Fatal("expected echo")
	}
	<-done
}