package lib

import (
	"testing"
)

func TestNewID_unique(t *testing.T) {
	ids := make(map[int64]bool)
	for i := 0; i < 1000; i++ {
		id := NewID()
		if id <= 0 {
			t.Fatalf("ID should be positive, got %d", id)
		}
		if ids[id] {
			t.Fatalf("duplicate ID after %d iterations", i)
		}
		ids[id] = true
	}
}

func TestIDToHex_and_back(t *testing.T) {
	id := NewID()
	hex := IDToHex(id)
	if len(hex) != 16 {
		t.Fatalf("hex should be 16 chars, got %d: %s", len(hex), hex)
	}
	back, err := HexToID(hex)
	if err != nil {
		t.Fatal(err)
	}
	if back != id {
		t.Errorf("roundtrip failed: %d -> %s -> %d", id, hex, back)
	}
}

func TestHexToID_invalid(t *testing.T) {
	_, err := HexToID("short")
	if err == nil {
		t.Error("should reject short hex")
	}
	_, err = HexToID("zzzzzzzzzzzzzzzz")
	if err == nil {
		t.Error("should reject non-hex chars")
	}
}