package core

import (
	"math/big"
	"testing"
)

func TestExpectedGuessDeterministic(t *testing.T) {
	a := ExpectedGuess("task_x", "seed", "client", 7, 28)
	b := ExpectedGuess("task_x", "seed", "client", 7, 28)
	if a != b {
		t.Fatalf("not deterministic: %s != %s", a, b)
	}
	n, ok := new(big.Int).SetString(a, 10)
	if !ok || n.Sign() < 0 || n.BitLen() > 28 {
		t.Fatalf("guess outside range: %s", a)
	}
}

func TestScore(t *testing.T) {
	if Score(big.NewInt(0), 32) != 100 {
		t.Fatal("exact hit must score 100")
	}
	near := Score(big.NewInt(1), 32)
	far := Score(new(big.Int).Lsh(big.NewInt(1), 30), 32)
	if near <= far {
		t.Fatalf("near score %f should exceed far %f", near, far)
	}
}