import { describe, it, expect, vi, beforeEach } from 'vitest';
import { createBrowserTools } from './tools.js';
import type { BrowserManager } from './manager.js';

const mockGoto = vi.fn().mockResolvedValue(undefined);
const mockTitle = vi.fn().mockResolvedValue('Test Page');
const mockUrl = vi.fn().mockReturnValue('https://example.com');
const mockClick = vi.fn().mockResolvedValue(undefined);
const mockType = vi.fn().mockResolvedValue(undefined);
const mock$eval = vi.fn().mockResolvedValue('Page content here');
const mockEvaluate = vi.fn().mockResolvedValue({ result: 42 });
const mockScreenshot = vi.fn().mockResolvedValue('base64data');
const mock$ = vi.fn().mockResolvedValue({ screenshot: vi.fn().mockResolvedValue('element-base64') });
const mockKeyboard = { press: vi.fn().mockResolvedValue(undefined) };

const mockPage = {
  goto: mockGoto,
  title: mockTitle,
  url: mockUrl,
  click: mockClick,
  type: mockType,
  $eval: mock$eval,
  evaluate: mockEvaluate,
  screenshot: mockScreenshot,
  $: mock$,
  keyboard: mockKeyboard,
  isClosed: () => false,
};

const mockManager = {
  getPage: vi.fn().mockResolvedValue(mockPage),
} as unknown as BrowserManager;

describe('Browser tools', () => {
  let tools: ReturnType<typeof createBrowserTools>;

  beforeEach(() => {
    vi.clearAllMocks();
    tools = createBrowserTools(mockManager);
  });

  it('creates all browser tools', () => {
    const names = tools.map(t => t.name);
    expect(names).toContain('browser.navigate');
    expect(names).toContain('browser.screenshot');
    expect(names).toContain('browser.click');
    expect(names).toContain('browser.type');
    expect(names).toContain('browser.content');
    expect(names).toContain('browser.eval');
    expect(names).toHaveLength(6);
  });

  it('browser.navigate navigates to URL', async () => {
    const tool = tools.find(t => t.name === 'browser.navigate')!;
    const result = await tool.execute({ url: 'https://example.com' });
    expect(result.success).toBe(true);
    expect(result.output).toContain('example.com');
    expect(mockGoto).toHaveBeenCalledWith('https://example.com', { waitUntil: 'domcontentloaded' });
  });

  it('browser.navigate respects custom waitUntil', async () => {
    const tool = tools.find(t => t.name === 'browser.navigate')!;
    await tool.execute({ url: 'https://example.com', waitUntil: 'networkidle0' });
    expect(mockGoto).toHaveBeenCalledWith('https://example.com', { waitUntil: 'networkidle0' });
  });

  it('browser.screenshot takes page screenshot', async () => {
    const tool = tools.find(t => t.name === 'browser.screenshot')!;
    const result = await tool.execute({});
    expect(result.success).toBe(true);
    expect(result.output).toContain('Screenshot captured');
    expect(mockScreenshot).toHaveBeenCalledWith({ encoding: 'base64', fullPage: false });
  });

  it('browser.screenshot takes element screenshot', async () => {
    const tool = tools.find(t => t.name === 'browser.screenshot')!;
    const result = await tool.execute({ selector: '#header' });
    expect(result.success).toBe(true);
    expect(mock$).toHaveBeenCalledWith('#header');
  });

  it('browser.screenshot fails for missing element', async () => {
    mock$.mockResolvedValueOnce(null);
    const tool = tools.find(t => t.name === 'browser.screenshot')!;
    const result = await tool.execute({ selector: '#nonexistent' });
    expect(result.success).toBe(false);
    expect(result.error).toContain('Element not found');
  });

  it('browser.click clicks element', async () => {
    const tool = tools.find(t => t.name === 'browser.click')!;
    const result = await tool.execute({ selector: '#submit' });
    expect(result.success).toBe(true);
    expect(mockClick).toHaveBeenCalledWith('#submit');
  });

  it('browser.type types into element', async () => {
    const tool = tools.find(t => t.name === 'browser.type')!;
    const result = await tool.execute({ selector: '#search', text: 'hello' });
    expect(result.success).toBe(true);
    expect(mockType).toHaveBeenCalledWith('#search', 'hello');
  });

  it('browser.type clears field before typing when clear=true', async () => {
    const tool = tools.find(t => t.name === 'browser.type')!;
    await tool.execute({ selector: '#search', text: 'hello', clear: true });
    expect(mockClick).toHaveBeenCalledWith('#search', { count: 3 });
    expect(mockKeyboard.press).toHaveBeenCalledWith('Backspace');
    expect(mockType).toHaveBeenCalledWith('#search', 'hello');
  });

  it('browser.content returns page text', async () => {
    const tool = tools.find(t => t.name === 'browser.content')!;
    const result = await tool.execute({});
    expect(result.success).toBe(true);
    expect(result.output).toContain('Page content here');
    expect(result.output).toContain('example.com');
    expect(result.output).toContain('Test Page');
  });

  it('browser.content uses custom selector', async () => {
    const tool = tools.find(t => t.name === 'browser.content')!;
    await tool.execute({ selector: '#main' });
    expect(mock$eval).toHaveBeenCalledWith('#main', expect.any(Function));
  });

  it('browser.eval evaluates JS', async () => {
    const tool = tools.find(t => t.name === 'browser.eval')!;
    const result = await tool.execute({ expression: '1 + 1' });
    expect(result.success).toBe(true);
    expect(result.output).toContain('42');
  });

  it('browser.eval returns string results directly', async () => {
    mockEvaluate.mockResolvedValueOnce('hello world');
    const tool = tools.find(t => t.name === 'browser.eval')!;
    const result = await tool.execute({ expression: '"hello world"' });
    expect(result.success).toBe(true);
    expect(result.output).toBe('hello world');
  });

  it('handles navigation errors gracefully', async () => {
    mockGoto.mockRejectedValueOnce(new Error('Navigation failed'));
    const tool = tools.find(t => t.name === 'browser.navigate')!;
    const result = await tool.execute({ url: 'https://broken.example.com' });
    expect(result.success).toBe(false);
    expect(result.error).toContain('Navigation failed');
  });

  it('handles click errors gracefully', async () => {
    mockClick.mockRejectedValueOnce(new Error('Element not found'));
    const tool = tools.find(t => t.name === 'browser.click')!;
    const result = await tool.execute({ selector: '#missing' });
    expect(result.success).toBe(false);
    expect(result.error).toContain('Element not found');
  });

  it('returns aborted error when signal is already aborted', async () => {
    const tool = tools.find(t => t.name === 'browser.navigate')!;
    const controller = new AbortController();
    controller.abort();

    const result = await tool.execute({ url: 'https://example.com' }, { signal: controller.signal });
    expect(result.success).toBe(false);
    expect(result.error).toContain('aborted');
    expect(mockManager.getPage).not.toHaveBeenCalled();
    expect(mockGoto).not.toHaveBeenCalled();
  });
});