/*
NAME
  bytescanner_test.go

DESCRIPTION
  See Readme.md

AUTHOR
  Dan Kortschak <dan@ausocean.org>

LICENSE
  This is Copyright (C) 2017 the Australian Ocean Lab (AusOcean)

  It is free software: you can redistribute it and/or modify them
  under the terms of the GNU General Public License as published by the
  Free Software Foundation, either version 3 of the License, or (at your
  option) any later version.

  It is distributed in the hope that it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
  for more details.

  You should have received a copy of the GNU General Public License
  in gpl.txt. If not, see http://www.gnu.org/licenses.
*/

package codecutil

import (
	"bytes"
	"reflect"
	"testing"
)

type chunkEncoder [][]byte

func (e *chunkEncoder) Encode(b []byte) error {
	*e = append(*e, b)
	return nil
}

func (*chunkEncoder) Stream() <-chan []byte { panic("INVALID USE") }

func TestScannerReadByte(t *testing.T) {
	data := []byte("Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.")

	for _, size := range []int{1, 2, 8, 1 << 10} {
		r := NewByteScanner(bytes.NewReader(data), make([]byte, size))
		var got []byte
		for {
			b, err := r.ReadByte()
			if err != nil {
				break
			}
			got = append(got, b)
		}
		if !bytes.Equal(got, data) {
			t.Errorf("unexpected result for buffer size %d:\ngot :%q\nwant:%q", size, got, data)
		}
	}
}

func TestScannerScanUntilZero(t *testing.T) {
	data := []byte("Lorem ipsum dolor sit amet, consectetur adipiscing elit,\x00 sed do eiusmod tempor incididunt ut \x00labore et dolore magna aliqua.")

	for _, size := range []int{1, 2, 8, 1 << 10} {
		r := NewByteScanner(bytes.NewReader(data), make([]byte, size))
		var got [][]byte
		for {
			buf, _, err := r.ScanUntil(nil, 0x0)
			got = append(got, buf)
			if err != nil {
				break
			}
		}
		want := bytes.SplitAfter(data, []byte{0})
		if !reflect.DeepEqual(got, want) {
			t.Errorf("unexpected result for buffer zie %d:\ngot :%q\nwant:%q", size, got, want)
		}
	}
}