package gopredictivenamegenerator

import (
	"hash/crc32"
	"hash/crc64"
	"math/rand"
	"testing"

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

// this string was found to return "boring-wozniak" when run with the
// predictive option. (This will change if the lists are altered.)
const seedString string = "1717521489308073576"

func TestNew(t *testing.T) {
	n := New()
	assert.IsType(t, NameGenerator{}, n)
}

func TestGetRandomName(t *testing.T) {
	var n NameGenerator

	testingSeed := crc64.Checksum([]byte(seedString), crc64.MakeTable(crc32.IEEE))
	n.rand = rand.New(rand.NewSource(int64(testingSeed)))

	name := n.GetRandom()
	assert.Equal(t, name, "elegant-solomon")
}

func TestGetRandomNameExclude(t *testing.T) {
	n := New()
	// this value will select "boring-wozniak".
	n.rand = rand.New(rand.NewSource(1717521489308012347))

	name := n.GetRandom()
	assert.Equal(t, name, "infallible-varahamihira")
}

func TestGetPredictiveName(t *testing.T) {
	var n NameGenerator

	name := n.GetPredictive(seedString)

	assert.EqualValues(t, name, "elegant-solomon")
}

func TestExclusions(t *testing.T) {
	answer := exclusions("boring-wozniak")
	assert.True(t, answer)

	answer = exclusions("sane-beeblebrox")
	assert.True(t, answer)

	answer = exclusions("sane-jannings")
	assert.False(t, answer)
}