import { describe, expect, test } from "bun:test";
import deriveWireguardInterfaceName from "./derive-wireguard-interface-name";

describe("deriveWireguardInterfaceName", () => {
    test("derives interface name from host id", () => {
        expect(deriveWireguardInterfaceName({ host_id: 0 })).toBe("wgui0");
        expect(deriveWireguardInterfaceName({ host_id: 1 })).toBe("wgui1");
        expect(deriveWireguardInterfaceName({ host_id: 7 })).toBe("wgui7");
    });

    test("uses a project-scoped prefix, never stock wgN", () => {
        expect(deriveWireguardInterfaceName({ host_id: 0 })).not.toBe("wg0");
        expect(deriveWireguardInterfaceName({ host_id: 1 })).not.toBe("wg1");
    });

    test("prefix matches wg-quick interface name requirements (<= 15 chars)", () => {
        expect(deriveWireguardInterfaceName({ host_id: 0 }).length).toBeLessThanOrEqual(
            15,
        );
    });
});