import { describe, expect, it } from "vitest";
import {
  MOB_ANIMATION_FAR_INTERVAL,
  MOB_ANIMATION_MEDIUM_INTERVAL,
  advanceMobAnimationCadence,
  createMobAnimationCadenceState,
  resolveMobAnimationInterval,
} from "./mobAnimationCadence";

describe("mob animation cadence", () => {
  it("keeps nearby and combat-critical actors at render rate", () => {
    expect(resolveMobAnimationInterval(true, false, 20 ** 2, false)).toBe(0);
    expect(resolveMobAnimationInterval(true, true, 90 ** 2, false)).toBe(0);
  });

  it("uses 30 Hz and 15 Hz tiers for visible background actors", () => {
    expect(resolveMobAnimationInterval(true, false, 50 ** 2, true))
      .toBe(MOB_ANIMATION_MEDIUM_INTERVAL);
    expect(resolveMobAnimationInterval(true, false, 90 ** 2, true))
      .toBe(MOB_ANIMATION_FAR_INTERVAL);
  });

  it("freezes inactive and safely offscreen background actors", () => {
    expect(resolveMobAnimationInterval(false, true, 10, true)).toBeNull();
    expect(resolveMobAnimationInterval(true, false, 50 ** 2, false)).toBeNull();
  });

  it("accumulates elapsed time so throttled clips keep real-time speed", () => {
    const state = createMobAnimationCadenceState();

    expect(advanceMobAnimationCadence(state, 1 / 60, 1 / 30)).toBe(0);
    expect(advanceMobAnimationCadence(state, 1 / 60, 1 / 30)).toBeCloseTo(1 / 30);
    expect(state.accumulatedDelta).toBe(0);
  });

  it("drops frozen time and caps individual frame gaps", () => {
    const state = createMobAnimationCadenceState();

    expect(advanceMobAnimationCadence(state, 1 / 60, 1 / 15)).toBe(0);
    expect(advanceMobAnimationCadence(state, 5, null)).toBe(0);
    expect(state.accumulatedDelta).toBe(0);
    expect(advanceMobAnimationCadence(state, 5, 0)).toBe(0.05);
  });
});