import { describe, expect, it } from "vitest";

import {
  activityColorSlug,
  activityDurationLabel,
  activityHeldMs,
} from "./activity.js";

describe("activityHeldMs", () => {
  it("measures time spent in the current state", () => {
    const now = Date.now();
    const since = new Date(now - 90_000).toISOString();
    expect(activityHeldMs(since, now)).toBe(90_000);
  });

  it("returns null for payloads that predate #102 (epoch default)", () => {
    expect(activityHeldMs(undefined, Date.now())).toBeNull();
    expect(activityHeldMs(new Date(0).toISOString(), Date.now())).toBeNull();
  });

  it("returns null for unparseable timestamps", () => {
    expect(activityHeldMs("not-a-time", Date.now())).toBeNull();
  });

  it("never goes negative", () => {
    const now = Date.now();
    expect(activityHeldMs(new Date(now + 5_000).toISOString(), now)).toBe(0);
  });
});

describe("activityDurationLabel (#102)", () => {
  it("floors whole seconds under a minute", () => {
    expect(activityDurationLabel(30_400)).toBe("30s");
    expect(activityDurationLabel(59_900)).toBe("59s");
  });

  it("floors whole minutes under an hour", () => {
    expect(activityDurationLabel(60_000)).toBe("1m");
    expect(activityDurationLabel(4 * 60_000 + 59_999)).toBe("4m");
  });

  it("floors whole hours from an hour up, with no days unit", () => {
    expect(activityDurationLabel(60 * 60_000)).toBe("1h");
    expect(activityDurationLabel(2 * 3_600_000 + 59 * 60_000 + 59_999)).toBe("2h");
    expect(activityDurationLabel(26 * 3_600_000)).toBe("26h");
  });
});

describe("activityColorSlug", () => {
  it("maps each known state to its contract slug", () => {
    expect(activityColorSlug("Active")).toBe("active");
    expect(activityColorSlug("Idle")).toBe("idle");
    expect(activityColorSlug("AwaitingInput")).toBe("awaiting-input");
    expect(activityColorSlug("Error")).toBe("error");
  });

  it("treats an unknown variant as idle so rendering never fails", () => {
    expect(activityColorSlug("Teleported")).toBe("idle");
  });
});