/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
import { renderHook, act } from '@testing-library/react';
import { useTimer } from './useTimer.js';
describe('useTimer', () => {
    beforeEach(() => {
        vi.useFakeTimers();
    });
    afterEach(() => {
        vi.restoreAllMocks();
    });
    it('should initialize with 0', () => {
        const { result } = renderHook(() => useTimer(false, 0));
        expect(result.current).toBe(0);
    });
    it('should not increment time if isActive is false', () => {
        const { result } = renderHook(() => useTimer(false, 0));
        act(() => {
            vi.advanceTimersByTime(5000);
        });
        expect(result.current).toBe(0);
    });
    it('should increment time every second if isActive is true', () => {
        const { result } = renderHook(() => useTimer(true, 0));
        act(() => {
            vi.advanceTimersByTime(1000);
        });
        expect(result.current).toBe(1);
        act(() => {
            vi.advanceTimersByTime(2000);
        });
        expect(result.current).toBe(3);
    });
    it('should reset to 0 and start incrementing when isActive becomes true from false', () => {
        const { result, rerender } = renderHook(({ isActive, resetKey }) => useTimer(isActive, resetKey), { initialProps: { isActive: false, resetKey: 0 } });
        expect(result.current).toBe(0);
        rerender({ isActive: true, resetKey: 0 });
        expect(result.current).toBe(0); // Should reset to 0 upon becoming active
        act(() => {
            vi.advanceTimersByTime(1000);
        });
        expect(result.current).toBe(1);
    });
    it('should reset to 0 when resetKey changes while active', () => {
        const { result, rerender } = renderHook(({ isActive, resetKey }) => useTimer(isActive, resetKey), { initialProps: { isActive: true, resetKey: 0 } });
        act(() => {
            vi.advanceTimersByTime(3000); // 3s
        });
        expect(result.current).toBe(3);
        rerender({ isActive: true, resetKey: 1 }); // Change resetKey
        expect(result.current).toBe(0); // Should reset to 0
        act(() => {
            vi.advanceTimersByTime(1000);
        });
        expect(result.current).toBe(1); // Starts incrementing from 0
    });
    it('should be 0 if isActive is false, regardless of resetKey changes', () => {
        const { result, rerender } = renderHook(({ isActive, resetKey }) => useTimer(isActive, resetKey), { initialProps: { isActive: false, resetKey: 0 } });
        expect(result.current).toBe(0);
        rerender({ isActive: false, resetKey: 1 });
        expect(result.current).toBe(0);
    });
    it('should clear timer on unmount', () => {
        const { unmount } = renderHook(() => useTimer(true, 0));
        const clearIntervalSpy = vi.spyOn(global, 'clearInterval');
        unmount();
        expect(clearIntervalSpy).toHaveBeenCalledOnce();
    });
    it('should preserve elapsedTime when isActive becomes false, and reset to 0 when it becomes active again', () => {
        const { result, rerender } = renderHook(({ isActive, resetKey }) => useTimer(isActive, resetKey), { initialProps: { isActive: true, resetKey: 0 } });
        act(() => {
            vi.advanceTimersByTime(3000); // Advance to 3 seconds
        });
        expect(result.current).toBe(3);
        rerender({ isActive: false, resetKey: 0 });
        expect(result.current).toBe(3); // Time should be preserved when timer becomes inactive
        // Now make it active again, it should reset to 0
        rerender({ isActive: true, resetKey: 0 });
        expect(result.current).toBe(0);
        act(() => {
            vi.advanceTimersByTime(1000);
        });
        expect(result.current).toBe(1);
    });
});
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