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 mock$$eval = vi.fn().mockResolvedValue(['Row 1', 'Row 2']);
const mockEvaluate = vi.fn().mockResolvedValue({ result: 42 });
const mockWaitForSelector = vi.fn().mockResolvedValue(undefined);
const mockWaitForFunction = vi.fn().mockResolvedValue(undefined);
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,
  $$eval: mock$$eval,
  evaluate: mockEvaluate,
  waitForSelector: mockWaitForSelector,
  waitForFunction: mockWaitForFunction,
  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>;

  function getTool(name: string) {
    const tool = tools.find(t => t.name === name);
    if (!tool) {
      throw new Error(`Tool not found: ${name}`);
    }
    return tool;
  }

  beforeEach(() => {
    vi.clearAllMocks();
    mockUrl.mockReturnValue('https://example.com');
    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.wait_for');
    expect(names).toContain('browser.assert');
    expect(names).toContain('browser.extract');
    expect(names).toContain('browser.checkpoint.save');
    expect(names).toContain('browser.checkpoint.resume');
    expect(names).toContain('browser.eval');
    expect(names).toContain('browser.evaluate');
    expect(names).toHaveLength(12);
  });

  it('browser.navigate navigates to URL', async () => {
    const tool = getTool('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 = getTool('browser.navigate');
    await tool.execute({ url: 'https://example.com', waitUntil: 'networkidle0' });
    expect(mockGoto).toHaveBeenCalledWith('https://example.com', { waitUntil: 'networkidle0' });
  });

  it('browser.navigate retries on transient errors', async () => {
    mockGoto.mockRejectedValueOnce(new Error('temporary down'));
    const tool = getTool('browser.navigate');
    const result = await tool.execute({
      url: 'https://example.com',
      retry: { attempts: 2, delay_ms: 0 },
    });
    expect(result.success).toBe(true);
    expect(mockGoto).toHaveBeenCalledTimes(2);
  });

  it('browser.screenshot takes page screenshot', async () => {
    const tool = getTool('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 = getTool('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 = getTool('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 = getTool('browser.click');
    const result = await tool.execute({ selector: '#submit' });
    expect(result.success).toBe(true);
    expect(mockClick).toHaveBeenCalledWith('#submit');
  });

  it('browser.click retries on transient failures', async () => {
    mockClick.mockRejectedValueOnce(new Error('click miss'));
    const tool = getTool('browser.click');
    const result = await tool.execute({
      selector: '#submit',
      retry: { attempts: 2, delay_ms: 0 },
    });
    expect(result.success).toBe(true);
    expect(mockClick).toHaveBeenCalledTimes(2);
  });

  it('browser.type types into element', async () => {
    const tool = getTool('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 = getTool('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 = getTool('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 = getTool('browser.content');
    await tool.execute({ selector: '#main' });
    expect(mock$eval).toHaveBeenCalledWith('#main', expect.any(Function));
  });

  it('browser.wait_for waits on selector and text', async () => {
    const tool = getTool('browser.wait_for');
    const result = await tool.execute({
      selector: '#loaded',
      text: 'Ready',
      timeout_ms: 5000,
    });
    expect(result.success).toBe(true);
    expect(mockWaitForSelector).toHaveBeenCalledWith('#loaded', { timeout: 5000, visible: false });
    expect(mockWaitForFunction).toHaveBeenCalled();
  });

  it('browser.assert validates selector/text/url conditions', async () => {
    const tool = getTool('browser.assert');
    const result = await tool.execute({
      selector: '#main',
      exists: true,
      text: 'Page content here',
      url_includes: 'example.com',
    });
    expect(result.success).toBe(true);
  });

  it('browser.assert fails when conditions are not met', async () => {
    mockUrl.mockReturnValue('https://example.com/path');
    mock$eval.mockResolvedValueOnce('different content');
    mock$.mockResolvedValueOnce(null);
    const tool = getTool('browser.assert');
    const result = await tool.execute({
      selector: '#missing',
      exists: true,
      text: 'not present',
      url_includes: 'nope',
      retry: { attempts: 1 },
    });
    expect(result.success).toBe(false);
    expect(result.error).toContain('failed after retries');
  });

  it('browser.extract returns a single value by selector', async () => {
    mock$eval.mockResolvedValueOnce('Primary value');
    const tool = getTool('browser.extract');
    const result = await tool.execute({ selector: '#value' });
    expect(result.success).toBe(true);
    expect(result.output).toContain('"value": "Primary value"');
  });

  it('browser.extract returns array values when all=true', async () => {
    mock$$eval.mockResolvedValueOnce(['A', 'B', 'C']);
    const tool = getTool('browser.extract');
    const result = await tool.execute({ selector: '.row', all: true });
    expect(result.success).toBe(true);
    expect(result.output).toContain('"count": 3');
    expect(result.output).toContain('"values"');
  });

  it('browser.checkpoint.save and resume navigates to saved url', async () => {
    const saveTool = getTool('browser.checkpoint.save');
    const resumeTool = getTool('browser.checkpoint.resume');

    const saved = await saveTool.execute({ checkpoint_id: 'cp-1' });
    expect(saved.success).toBe(true);
    expect(saved.output).toContain('cp-1');

    const resumed = await resumeTool.execute({ checkpoint_id: 'cp-1' });
    expect(resumed.success).toBe(true);
    expect(mockGoto).toHaveBeenCalledWith('https://example.com', { waitUntil: 'domcontentloaded' });
  });

  it('browser.eval evaluates JS', async () => {
    const tool = getTool('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 = getTool('browser.eval');
    const result = await tool.execute({ expression: '"hello world"' });
    expect(result.success).toBe(true);
    expect(result.output).toBe('hello world');
  });

  it('browser.evaluate aliases browser.eval behavior', async () => {
    const tool = getTool('browser.evaluate');
    const result = await tool.execute({ expression: '1 + 1' });
    expect(result.success).toBe(true);
    expect(result.output).toContain('42');
  });

  it('enforces allowed domain guardrail for navigation', async () => {
    const restrictedTools = createBrowserTools(mockManager, {
      allowedDomains: ['example.com'],
    });
    const navigate = restrictedTools.find((tool) => tool.name === 'browser.navigate');
    if (!navigate) {
      throw new Error('missing navigate tool');
    }
    const result = await navigate.execute({ url: 'https://blocked.test' });
    expect(result.success).toBe(false);
    expect(result.error).toContain('allowed_domains');
  });

  it('requires explicit high-risk confirmation for configured domains', async () => {
    const guardedTools = createBrowserTools(mockManager, {
      highRiskDomains: ['bank.example.com'],
      requireHighRiskConfirmation: true,
    });
    const navigate = guardedTools.find((tool) => tool.name === 'browser.navigate');
    if (!navigate) {
      throw new Error('missing navigate tool');
    }

    const denied = await navigate.execute({ url: 'https://bank.example.com' });
    expect(denied.success).toBe(false);
    expect(denied.error).toContain('confirm_high_risk=true');

    const allowed = await navigate.execute({
      url: 'https://bank.example.com',
      confirm_high_risk: true,
    });
    expect(allowed.success).toBe(true);
  });

  it('enforces workflow step budget', async () => {
    const budgetedTools = createBrowserTools(mockManager, {
      maxWorkflowSteps: 1,
    });
    const navigate = budgetedTools.find((tool) => tool.name === 'browser.navigate');
    const click = budgetedTools.find((tool) => tool.name === 'browser.click');
    if (!navigate || !click) {
      throw new Error('missing browser tools');
    }

    const first = await navigate.execute({ url: 'https://example.com' });
    expect(first.success).toBe(true);
    const second = await click.execute({ selector: '#submit' });
    expect(second.success).toBe(false);
    expect(second.error).toContain('budget exhausted');
  });

  it('handles navigation errors gracefully', async () => {
    mockGoto.mockRejectedValueOnce(new Error('Navigation failed'));
    const tool = getTool('browser.navigate');
    const result = await tool.execute({ url: 'https://broken.example.com', retry: { attempts: 1 } });
    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 = getTool('browser.click');
    const result = await tool.execute({ selector: '#missing', retry: { attempts: 1 } });
    expect(result.success).toBe(false);
    expect(result.error).toContain('Element not found');
  });

  it('returns aborted error when signal is already aborted', async () => {
    const tool = getTool('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();
  });
});