package main

import (
	"encoding/binary"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestAudioVersionId(t *testing.T) {
	bytes := []byte{0xff, 0xe8, 0, 0}
	h, err := newHeader(binary.LittleEndian.Uint32(bytes))
	require.NoError(t, err)
	assert.Equal(t, AudioVersionReserved, h.AudioVersionId())

	bytes = []byte{0xff, 0xf0, 0, 0}
	h, err = newHeader(binary.LittleEndian.Uint32(bytes))
	require.NoError(t, err)
	assert.Equal(t, AudioVersionMPEG2, h.AudioVersionId())

	bytes = []byte{0xff, 0xff, 0, 0}
	h, err = newHeader(binary.LittleEndian.Uint32(bytes))
	require.NoError(t, err)
	assert.Equal(t, AudioVersionMPEG1, h.AudioVersionId())

	bytes = []byte{0xff, 0xe0, 0, 0}
	h, err = newHeader(binary.LittleEndian.Uint32(bytes))
	require.NoError(t, err)
	assert.Equal(t, AudioVersionMPEG25, h.AudioVersionId())
}

func TestLayerIndex(t *testing.T) {
	bytes := []byte{0xff, 0xe2, 0, 0}
	h, err := newHeader(binary.LittleEndian.Uint32(bytes))
	require.NoError(t, err)
	assert.Equal(t, LayerIndexIII, h.LayerIndex())

	bytes = []byte{0xff, 0xe4, 0, 0}
	h, err = newHeader(binary.LittleEndian.Uint32(bytes))
	require.NoError(t, err)
	assert.Equal(t, LayerIndexII, h.LayerIndex())

	bytes = []byte{0xff, 0xe6, 0, 0}
	h, err = newHeader(binary.LittleEndian.Uint32(bytes))
	require.NoError(t, err)
	assert.Equal(t, LayerIndexI, h.LayerIndex())
}