package bootsect

import (
	"encoding/binary"
	"testing"
)

func TestParseBootSectorUsesCorrectFieldWidths(t *testing.T) {
	data := make([]byte, 512)
	copy(data[0x03:], []byte("NTFS    "))
	binary.LittleEndian.PutUint16(data[0x0B:], 512)
	data[0x0D] = 8
	data[0x15] = 0xF8
	binary.LittleEndian.PutUint16(data[0x18:], 63)
	binary.LittleEndian.PutUint16(data[0x1A:], 255)
	binary.LittleEndian.PutUint32(data[0x1C:], 0x11223344)
	binary.LittleEndian.PutUint64(data[0x28:], 0x0102030405060708)
	binary.LittleEndian.PutUint64(data[0x30:], 0x1112131415161718)
	binary.LittleEndian.PutUint64(data[0x38:], 0x2122232425262728)
	data[0x40] = 0xF6
	data[0x44] = 1
	copy(data[0x48:], []byte{1, 2, 3, 4, 5, 6, 7, 8})

	boot, err := Parse(data)
	if err != nil {
		t.Fatalf("Parse failed: %v", err)
	}

	if boot.SectorsPerCluster != 8 {
		t.Fatalf("SectorsPerCluster = %d, want 8", boot.SectorsPerCluster)
	}
	if boot.HiddenSectors != 0x11223344 {
		t.Fatalf("HiddenSectors = %#x, want %#x", boot.HiddenSectors, 0x11223344)
	}
	if boot.FileRecordSegmentSizeInBytes != 1024 {
		t.Fatalf("FileRecordSegmentSizeInBytes = %d, want 1024", boot.FileRecordSegmentSizeInBytes)
	}
	if boot.IndexBufferSizeInBytes != 4096 {
		t.Fatalf("IndexBufferSizeInBytes = %d, want 4096", boot.IndexBufferSizeInBytes)
	}
}