// Copyright 2015 The Vanadium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package framer

import (
	"bytes"
	"testing"
)

type readWriteCloser struct {
	bytes.Buffer
}

func (*readWriteCloser) Close() error {
	return nil
}

func TestFramer(t *testing.T) {
	f := &framer{ReadWriteCloser: &readWriteCloser{}}
	bufs := [][]byte{[]byte("read "), []byte("this "), []byte("please.")}
	want := []byte("read this please.")
	l := len(want)
	if n, err := f.WriteMsg(bufs...); err != nil || n != l {
		t.Fatalf("got %v, %v, want %v, nil", n, err, l)
	}
	if got, err := f.ReadMsg(); err != nil || !bytes.Equal(got, want) {
		t.Errorf("got %v, %v, want %v, nil", got, err, want)
	}
	// Framing a smaller message afterwards should reuse the internal buffer
	// from the first sent message.
	bufs = [][]byte{[]byte("read "), []byte("this "), []byte("too.")}
	want = []byte("read this too.")
	oldBufferLen := l + 3
	l = len(want)
	if n, err := f.WriteMsg(bufs...); err != nil || n != l {
		t.Fatalf("got %v, %v, want %v, nil", n, err, l)
	}
	if got, err := f.ReadMsg(); err != nil || !bytes.Equal(got, want) {
		t.Errorf("got %v, %v, want %v, nil", got, err, want)
	}
	if len(f.buf) != oldBufferLen {
		t.Errorf("framer internal buffer should have been reused")
	}
	// Sending larger message afterwards should work as well.
	bufs = [][]byte{[]byte("read "), []byte("this "), []byte("way bigger message.")}
	want = []byte("read this way bigger message.")
	l = len(want)
	if n, err := f.WriteMsg(bufs...); err != nil || n != l {
		t.Fatalf("got %v, %v, want %v, nil", n, err, l)
	}
	if got, err := f.ReadMsg(); err != nil || !bytes.Equal(got, want) {
		t.Errorf("got %v, %v, want %v, nil", got, err, want)
	}
}

func Test3ByteUint(t *testing.T) {
	var b [3]byte
	if err := write3ByteUint(b[:], 65555); err != nil {
		t.Error(err)
	}
	if got := read3ByteUint(b); got != 65555 {
		t.Errorf("got %v, want %v", got, 65555)
	}
}