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package fibonacci

import (
	diff "0dev.org/diff"
	"bytes"
	"io"
	"strings"
	"testing"
)

func TestNumbers(t *testing.T) {
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		}
		if encLen != decLen {
			t.Errorf("Unexpected difference between encoded and decoded lengths.", encLen, decLen)
		}
	}
}

func TestWriter(t *testing.T) {
	var buf bytes.Buffer
	var w io.Writer = Writer(&buf)
	var input []byte = make([]byte, 256)
	var fib Numbers = New(16)
func TestWriterReader(t *testing.T) {
	var (
		buf   bytes.Buffer
		w     io.Writer = Writer(&buf)
		input []byte    = make([]byte, 256)
		fib   Numbers   = New(16)
	)

	for i := uint64(0); i < 256; i++ {
		input[i] = byte(i)
	}

	// Write the input
	count, err := w.Write(input)
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		c, l := fib.Code(uint64(v))
		vs := u2s(c, l)
		if loc := strings.Index(output, vs); loc != 0 {
			t.Fatal("Unexpected location for", i, "value", vs)
		}
		output = output[len(vs):]
	}

	var (
		in  *bytes.Reader = bytes.NewReader(buf.Bytes())
		r   io.Reader     = Reader(in)
		out bytes.Buffer
	)
	io.Copy(&out, r)
	decoded := out.Bytes()

	delta := diff.Diff(diff.D{Len1: len(decoded), Len2: len(input), EqualFunc: func(i, j int) bool {
		return decoded[i] == input[j]
	}})

	if len(delta.Added) > 0 || len(delta.Removed) > 0 {
		t.Error("Differences detected ", delta)
	}
}

func u2s(b uint64, l byte) (result string) {
	for i := byte(0); i < l; i++ {
		if (b & 1) > 0 {
			result += "1"
		} else {
			result += "0"
		}
		b >>= 1
	}
	return
}