package p2p

import (
	"bytes"
	"io/ioutil"
	"testing"

	"github.com/ethereum/go-ethereum/ethutil"
)

func TestNewMsg(t *testing.T) {
	msg := NewMsg(3, 1, "000")
	if msg.Code != 3 {
		t.Errorf("incorrect code %d, want %d", msg.Code)
	}
	if msg.Size != 5 {
		t.Errorf("incorrect size %d, want %d", msg.Size, 5)
	}
	pl, _ := ioutil.ReadAll(msg.Payload)
	expect := []byte{0x01, 0x83, 0x30, 0x30, 0x30}
	if !bytes.Equal(pl, expect) {
		t.Errorf("incorrect payload content, got %x, want %x", pl, expect)
	}
}

func TestEncodeDecodeMsg(t *testing.T) {
	msg := NewMsg(3, 1, "000")
	buf := new(bytes.Buffer)
	if err := writeMsg(buf, msg); err != nil {
		t.Fatalf("encodeMsg error: %v", err)
	}
	// t.Logf("encoded: %x", buf.Bytes())

	decmsg, err := readMsg(buf)
	if err != nil {
		t.Fatalf("readMsg error: %v", err)
	}
	if decmsg.Code != 3 {
		t.Errorf("incorrect code %d, want %d", decmsg.Code, 3)
	}
	if decmsg.Size != 5 {
		t.Errorf("incorrect size %d, want %d", decmsg.Size, 5)
	}

	var data struct {
		I uint
		S string
	}
	if err := decmsg.Decode(&data); err != nil {
		t.Fatalf("Decode error: %v", err)
	}
	if data.I != 1 {
		t.Errorf("incorrect data.I: got %v, expected %d", data.I, 1)
	}
	if data.S != "000" {
		t.Errorf("incorrect data.S: got %q, expected %q", data.S, "000")
	}
}

func TestDecodeRealMsg(t *testing.T) {
	data := ethutil.Hex2Bytes("2240089100000080f87e8002b5457468657265756d282b2b292f5065657220536572766572204f6e652f76302e372e382f52656c656173652f4c696e75782f672b2bc082765fb84086dd80b7aefd6a6d2e3b93f4f300a86bfb6ef7bdc97cb03f793db6bb")
	msg, err := readMsg(bytes.NewReader(data))
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	if msg.Code != 0 {
		t.Errorf("incorrect code %d, want %d", msg.Code, 0)
	}
}