package iskra

import "testing"

func TestHashDeterministic(t *testing.T) {
	data := []byte("func main()")
	h1 := HashBytes(data)
	h2 := HashBytes(data)
	if h1 != h2 {
		t.Fatal("hash should be deterministic")
	}
}

func TestHashDistinct(t *testing.T) {
	h1 := HashBytes([]byte("func main()"))
	h2 := HashBytes([]byte("func init()"))
	if h1 == h2 {
		t.Fatal("different inputs should produce different hashes")
	}
}

func TestHash56Bit(t *testing.T) {
	h := HashBytes([]byte("anything"))
	if h>>56 != 0 {
		t.Fatal("hash should be 56 bits (top 8 bits zero)")
	}
}

func TestSegmentKeyStage(t *testing.T) {
	key := SegmentKey(StageSRC, []byte("test"))
	if KeyStage(key) != StageSRC {
		t.Fatal("stage tag not preserved")
	}
	key2 := SegmentKey(StageBIN, []byte("test"))
	if KeyStage(key2) != StageBIN {
		t.Fatal("stage tag not preserved for BIN")
	}
	if KeyHash(key) != KeyHash(key2) {
		t.Fatal("same content should have same hash regardless of stage")
	}
	if key == key2 {
		t.Fatal("different stages should produce different keys")
	}
}