package erasureencode

import (
	// "fmt"
	"bytes"
	"io"
	"testing"
)

var simpleEncodeMeta = &EEMeta{
	Params: Params{
		Size:   0,
		Stride: 2,
		Shards: 3,
		Parity: 2,
	},
}

func TestEncode_EvenStride_Full(t *testing.T) {
	file := []byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11}
	simpleEncodeMeta.Params.Size = uint64(len(file))

	reader := bytes.NewReader(file)

	outputs := []io.Writer{&bytes.Buffer{}, &bytes.Buffer{}, &bytes.Buffer{}, &bytes.Buffer{}, &bytes.Buffer{}}

	if err := Encode(reader, outputs, simpleEncodeMeta); err != nil {
		t.Errorf(`Error: %s`, err)
	}

	actual := outputs[0].(*bytes.Buffer).Bytes()
	expected := []byte{0x00, 0x01, 0x06, 0x07, 0x0c, 0x0d}
	if !bytes.Equal(actual, expected) {
		t.Errorf(`Expected[0] %x to equal %x`, actual, expected)
	}

	actual = outputs[1].(*bytes.Buffer).Bytes()
	expected = []byte{0x02, 0x03, 0x08, 0x09, 0x0e, 0x0f}
	if !bytes.Equal(actual, expected) {
		t.Errorf(`Expected[1] %x to equal %x`, actual, expected)
	}

	actual = outputs[2].(*bytes.Buffer).Bytes()
	expected = []byte{0x04, 0x05, 0x0a, 0x0b, 0x10, 0x11}
	if !bytes.Equal(actual, expected) {
		t.Errorf(`Expected[2] %x to equal %x`, actual, expected)
	}

	unexpected := []byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00}

	actual = outputs[3].(*bytes.Buffer).Bytes()
	if bytes.Equal(actual, unexpected) {
		t.Errorf(`Expected[3] %x to not equal %x`, actual, unexpected)
	}

	actual = outputs[4].(*bytes.Buffer).Bytes()
	if bytes.Equal(actual, unexpected) {
		t.Errorf(`Expected[4] %x to not equal %x`, actual, unexpected)
	}
}

func TestEncode_EvenStride_Short1(t *testing.T) {
	file := []byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10}
	simpleEncodeMeta.Params.Size = uint64(len(file))

	reader := bytes.NewReader(file)

	outputs := []io.Writer{&bytes.Buffer{}, &bytes.Buffer{}, &bytes.Buffer{}, &bytes.Buffer{}, &bytes.Buffer{}}

	if err := Encode(reader, outputs, simpleEncodeMeta); err != nil {
		t.Errorf(`Error: %s`, err)
	}

	actual := outputs[0].(*bytes.Buffer).Bytes()
	expected := []byte{0x00, 0x01, 0x06, 0x07, 0x0c, 0x0d}
	if !bytes.Equal(actual, expected) {
		t.Errorf(`Expected[0] %x to equal %x`, actual, expected)
	}

	actual = outputs[1].(*bytes.Buffer).Bytes()
	expected = []byte{0x02, 0x03, 0x08, 0x09, 0x0e, 0x0f}
	if !bytes.Equal(actual, expected) {
		t.Errorf(`Expected[1] %x to equal %x`, actual, expected)
	}

	actual = outputs[2].(*bytes.Buffer).Bytes()
	expected = []byte{0x04, 0x05, 0x0a, 0x0b, 0x10, 0x00}
	if !bytes.Equal(actual, expected) {
		t.Errorf(`Expected[2] %x to equal %x`, actual, expected)
	}

	unexpected := []byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00}

	actual = outputs[3].(*bytes.Buffer).Bytes()
	if bytes.Equal(actual, unexpected) {
		t.Errorf(`Expected[3] %x to not equal %x`, actual, unexpected)
	}

	actual = outputs[4].(*bytes.Buffer).Bytes()
	if bytes.Equal(actual, unexpected) {
		t.Errorf(`Expected[4] %x to not equal %x`, actual, unexpected)
	}
}

func TestEncode_EvenStride_Short2(t *testing.T) {
	file := []byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f}
	simpleEncodeMeta.Params.Size = uint64(len(file))

	reader := bytes.NewReader(file)

	outputs := []io.Writer{&bytes.Buffer{}, &bytes.Buffer{}, &bytes.Buffer{}, &bytes.Buffer{}, &bytes.Buffer{}}

	if err := Encode(reader, outputs, simpleEncodeMeta); err != nil {
		t.Errorf(`Error: %s`, err)
	}

	actual := outputs[0].(*bytes.Buffer).Bytes()
	expected := []byte{0x00, 0x01, 0x06, 0x07, 0x0c, 0x0d}
	if !bytes.Equal(actual, expected) {
		t.Errorf(`Expected[0] %x to equal %x`, actual, expected)
	}

	actual = outputs[1].(*bytes.Buffer).Bytes()
	expected = []byte{0x02, 0x03, 0x08, 0x09, 0x0e, 0x0f}
	if !bytes.Equal(actual, expected) {
		t.Errorf(`Expected[1] %x to equal %x`, actual, expected)
	}

	actual = outputs[2].(*bytes.Buffer).Bytes()
	expected = []byte{0x04, 0x05, 0x0a, 0x0b, 0x00, 0x00}
	if !bytes.Equal(actual, expected) {
		t.Errorf(`Expected[2] %x to equal %x`, actual, expected)
	}

	unexpected := []byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00}

	actual = outputs[3].(*bytes.Buffer).Bytes()
	if bytes.Equal(actual, unexpected) {
		t.Errorf(`Expected[3] %x to not equal %x`, actual, unexpected)
	}

	actual = outputs[4].(*bytes.Buffer).Bytes()
	if bytes.Equal(actual, unexpected) {
		t.Errorf(`Expected[4] %x to not equal %x`, actual, unexpected)
	}
}

func TestEncode_OddStride_Full(t *testing.T) {
	file := []byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e}
	simpleEncodeMeta.Params.Size = uint64(len(file))

	reader := bytes.NewReader(file)

	outputs := []io.Writer{&bytes.Buffer{}, &bytes.Buffer{}, &bytes.Buffer{}, &bytes.Buffer{}, &bytes.Buffer{}}

	if err := Encode(reader, outputs, simpleEncodeMeta); err != nil {
		t.Errorf(`Error: %s`, err)
	}

	actual := outputs[0].(*bytes.Buffer).Bytes()
	expected := []byte{0x00, 0x01, 0x06, 0x07, 0x0c}
	if !bytes.Equal(actual, expected) {
		t.Errorf(`Expected[0] %x to equal %x`, actual, expected)
	}

	actual = outputs[1].(*bytes.Buffer).Bytes()
	expected = []byte{0x02, 0x03, 0x08, 0x09, 0x0d}
	if !bytes.Equal(actual, expected) {
		t.Errorf(`Expected[1] %x to equal %x`, actual, expected)
	}

	actual = outputs[2].(*bytes.Buffer).Bytes()
	expected = []byte{0x04, 0x05, 0x0a, 0x0b, 0x0e}
	if !bytes.Equal(actual, expected) {
		t.Errorf(`Expected[2] %x to equal %x`, actual, expected)
	}

	unexpected := []byte{0x00, 0x00, 0x00, 0x00, 0x00}

	actual = outputs[3].(*bytes.Buffer).Bytes()
	if len(actual) != len(unexpected) {
		t.Errorf("Expected[3] actual len to be %d, not %d", len(unexpected), len(actual))
	}
	if bytes.Equal(actual, unexpected) {
		t.Errorf(`Expected[3] %x to not equal %x`, actual, unexpected)
	}

	actual = outputs[4].(*bytes.Buffer).Bytes()
	if len(actual) != len(unexpected) {
		t.Errorf("Expected[4] actual len to be %d, not %d", len(unexpected), len(actual))
	}
	if bytes.Equal(actual, unexpected) {
		t.Errorf(`Expected[4] %x to not equal %x`, actual, unexpected)
	}
}

func TestEncode_OddStride_Short1(t *testing.T) {
	file := []byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d}
	simpleEncodeMeta.Params.Size = uint64(len(file))

	reader := bytes.NewReader(file)

	outputs := []io.Writer{&bytes.Buffer{}, &bytes.Buffer{}, &bytes.Buffer{}, &bytes.Buffer{}, &bytes.Buffer{}}

	if err := Encode(reader, outputs, simpleEncodeMeta); err != nil {
		t.Errorf(`Error: %s`, err)
	}

	actual := outputs[0].(*bytes.Buffer).Bytes()
	expected := []byte{0x00, 0x01, 0x06, 0x07, 0x0c}
	if !bytes.Equal(actual, expected) {
		t.Errorf(`Expected[0] %x to equal %x`, actual, expected)
	}

	actual = outputs[1].(*bytes.Buffer).Bytes()
	expected = []byte{0x02, 0x03, 0x08, 0x09, 0x0d}
	if !bytes.Equal(actual, expected) {
		t.Errorf(`Expected[1] %x to equal %x`, actual, expected)
	}

	actual = outputs[2].(*bytes.Buffer).Bytes()
	expected = []byte{0x04, 0x05, 0x0a, 0x0b, 0x00}
	if !bytes.Equal(actual, expected) {
		t.Errorf(`Expected[2] %x to equal %x`, actual, expected)
	}

	unexpected := []byte{0x00, 0x00, 0x00, 0x00, 0x00}

	actual = outputs[3].(*bytes.Buffer).Bytes()
	if len(actual) != len(unexpected) {
		t.Errorf("Expected[3] actual len to be %d, not %d", len(unexpected), len(actual))
	}
	if bytes.Equal(actual, unexpected) {
		t.Errorf(`Expected[3] %x to not equal %x`, actual, unexpected)
	}

	actual = outputs[4].(*bytes.Buffer).Bytes()
	if len(actual) != len(unexpected) {
		t.Errorf("Expected[4] actual len to be %d, not %d", len(unexpected), len(actual))
	}
	if bytes.Equal(actual, unexpected) {
		t.Errorf(`Expected[4] %x to not equal %x`, actual, unexpected)
	}
}

func TestEncode_OddStride_Short2(t *testing.T) {
	file := []byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c}
	simpleEncodeMeta.Params.Size = uint64(len(file))

	reader := bytes.NewReader(file)

	outputs := []io.Writer{&bytes.Buffer{}, &bytes.Buffer{}, &bytes.Buffer{}, &bytes.Buffer{}, &bytes.Buffer{}}

	if err := Encode(reader, outputs, simpleEncodeMeta); err != nil {
		t.Errorf(`Error: %s`, err)
	}

	actual := outputs[0].(*bytes.Buffer).Bytes()
	expected := []byte{0x00, 0x01, 0x06, 0x07, 0x0c}
	if !bytes.Equal(actual, expected) {
		t.Errorf(`Expected[0] %x to equal %x`, actual, expected)
	}

	actual = outputs[1].(*bytes.Buffer).Bytes()
	expected = []byte{0x02, 0x03, 0x08, 0x09, 0x00}
	if !bytes.Equal(actual, expected) {
		t.Errorf(`Expected[1] %x to equal %x`, actual, expected)
	}

	actual = outputs[2].(*bytes.Buffer).Bytes()
	expected = []byte{0x04, 0x05, 0x0a, 0x0b, 0x00}
	if !bytes.Equal(actual, expected) {
		t.Errorf(`Expected[2] %x to equal %x`, actual, expected)
	}

	unexpected := []byte{0x00, 0x00, 0x00, 0x00, 0x00}

	actual = outputs[3].(*bytes.Buffer).Bytes()
	if len(actual) != len(unexpected) {
		t.Errorf("Expected[3] actual len to be %d, not %d", len(unexpected), len(actual))
	}
	if bytes.Equal(actual, unexpected) {
		t.Errorf(`Expected[3] %x to not equal %x`, actual, unexpected)
	}

	actual = outputs[4].(*bytes.Buffer).Bytes()
	if len(actual) != len(unexpected) {
		t.Errorf("Expected[4] actual len to be %d, not %d", len(unexpected), len(actual))
	}
	if bytes.Equal(actual, unexpected) {
		t.Errorf(`Expected[4] %x to not equal %x`, actual, unexpected)
	}
}