import { describe, expect, it } from "vitest";
import { hostname, isContainerIdLike, parseCgroupContainerId } from "../src/hostInfo.js";

describe("parseCgroupContainerId", () => {
  it("parses a cgroup v1 docker path", () => {
    const data = "12:memory:/docker/9f8b7c6d5e4f3a2b1c0d9e8f7a6b5c4d3e2f1a0b9c8d7e6f5a4b3c2d1e0f9a8b\n";
    expect(parseCgroupContainerId(data)).toBe("9f8b7c6d5e4f3a2b1c0d9e8f7a6b5c4d3e2f1a0b9c8d7e6f5a4b3c2d1e0f9a8b");
  });

  it("parses a cgroup v2 systemd scope", () => {
    const data = "0::/system.slice/docker-9f8b7c6d5e4f3a2b1c0d9e8f7a6b5c4d3e2f1a0b9c8d7e6f5a4b3c2d1e0f9a8b.scope\n";
    expect(parseCgroupContainerId(data)).toBe("9f8b7c6d5e4f3a2b1c0d9e8f7a6b5c4d3e2f1a0b9c8d7e6f5a4b3c2d1e0f9a8b");
  });

  it("returns empty on a non-container host", () => {
    expect(parseCgroupContainerId("0::/user.slice/user-1000.slice/session-2.scope\n")).toBe("");
  });

  it("returns empty for empty input", () => {
    expect(parseCgroupContainerId("")).toBe("");
  });
});

describe("isContainerIdLike", () => {
  it("accepts a hex id of valid length", () => {
    expect(isContainerIdLike("9f8b7c6d5e4f")).toBe(true);
  });
  it("rejects short strings", () => {
    expect(isContainerIdLike("short")).toBe(false);
  });
  it("rejects non-hex strings", () => {
    expect(isContainerIdLike("session-2")).toBe(false);
  });
  it("rejects empty strings", () => {
    expect(isContainerIdLike("")).toBe(false);
  });
});

describe("hostname", () => {
  it("returns a non-empty value", () => {
    expect(hostname().length).toBeGreaterThan(0);
  });
});