package ref

import (
	"testing"

	"crypto/sha1"

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

func TestParseError(t *testing.T) {
	assert := assert.New(t)

	r, err := Parse("foo")
	assert.Error(err)
	r, err = Parse("sha1")
	assert.Error(err)
	r, err = Parse("sha1-0")
	assert.Error(err)

	// too many digits
	r, err = Parse("sha1-00000000000000000000000000000000000000000")
	assert.Error(err)

	// 'g' not valid hex
	r, err = Parse("sha1-	000000000000000000000000000000000000000g")
	assert.Error(err)

	// sha2 not supported
	r, err = Parse("sha2-0000000000000000000000000000000000000000")
	assert.Error(err)

	r, err = Parse("sha1-0000000000000000000000000000000000000000")
	assert.NoError(err)
	assert.NotNil(r)
}

func TestEquals(t *testing.T) {
	assert := assert.New(t)

	r0 := MustParse("sha1-0000000000000000000000000000000000000000")
	r01 := MustParse("sha1-0000000000000000000000000000000000000000")
	r1 := MustParse("sha1-0000000000000000000000000000000000000001")

	assert.Equal(r0, r01)
	assert.Equal(r01, r0)
	assert.NotEqual(r0, r1)
	assert.NotEqual(r1, r0)
}

func TestString(t *testing.T) {
	s := "sha1-0123456789abcdef0123456789abcdef01234567"
	r := MustParse(s)
	assert.Equal(t, s, r.String())
}

func TestDigest(t *testing.T) {
	r := New(Sha1Digest{})
	d := r.Digest()
	assert.Equal(t, r.Digest(), d)
	// Digest() must return a copy otherwise things get weird.
	d[0] = 0x01
	assert.NotEqual(t, r.Digest(), d)
}

func TestFromHash(t *testing.T) {
	h := sha1.New()
	h.Write([]byte("abc"))
	r := FromHash(h)
	assert.Equal(t, "sha1-a9993e364706816aba3e25717850c26c9cd0d89d", r.String())
}