import { afterEach, describe, expect, it, vi } from 'vitest';
import ScreenshotHelper from './ScreenshotHelper.mjs';

afterEach(() => {
  vi.unstubAllEnvs();
});

describe('ScreenshotHelper', () => {
  it('captures a local screenshot through Browserless', async () => {
    vi.stubEnv('SCREENSHOT_PROVIDER', 'browserless');

    let png = Buffer.from([137, 80, 78, 71]);
    let page = {
      setViewport: vi.fn(),
      goto: vi.fn(),
      waitForSelector: vi.fn(),
      screenshot: vi.fn().mockResolvedValue(png),
      close: vi.fn(),
    };
    let browser = {
      newPage: vi.fn().mockResolvedValue(page),
      close: vi.fn(),
    };
    let puppeteerClient = {
      connect: vi.fn().mockResolvedValue(browser),
    };
    let httpServer = {
      port: 4321,
      open: vi.fn(),
      close: vi.fn(),
    };
    let helper = new ScreenshotHelper({
      env: {
        BROWSERLESS_ENDPOINT: 'ws://browserless:3000',
        SCREENSHOT_HOST: 'app',
      },
      httpServerFactory: () => httpServer,
      puppeteerClient,
    });

    let screenshot = await helper.capture('schedules', {
      viewport: { height: 400 },
    });
    await helper.close();

    expect(screenshot).toEqual(png);
    expect(puppeteerClient.connect).toHaveBeenCalledWith({
      browserWSEndpoint: 'ws://browserless:3000',
    });
    expect(page.setViewport).toHaveBeenCalledWith({
      width: 1200,
      height: 400,
      deviceScaleFactor: 2,
    });
    expect(page.goto).toHaveBeenCalledWith(
      new URL('http://app:4321/screenshots/#schedules'),
      { waitUntil: 'load' },
    );
    expect(page.waitForSelector).toHaveBeenCalledWith(
      '[data-screenshot-ready="true"]',
      { timeout: 30_000 },
    );
    expect(httpServer.close).toHaveBeenCalledOnce();
    expect(page.close).toHaveBeenCalledOnce();
    expect(browser.close).toHaveBeenCalledOnce();
  });

  it('captures a public screenshot through Cloudflare Browser Run', async () => {
    vi.stubEnv('SCREENSHOT_PROVIDER', 'cloudflare');
    vi.stubEnv('SITE_URL', 'https://splatoon3.ink');
    vi.stubEnv('CLOUDFLARE_ACCOUNT_ID', 'account-id');
    vi.stubEnv('CLOUDFLARE_BROWSER_RUN_API_TOKEN', 'api-token');

    let png = new Uint8Array([137, 80, 78, 71]);
    let fetch = vi.fn().mockResolvedValue(new Response(png, {
      headers: { 'Content-Type': 'image/png' },
    }));
    let helper = new ScreenshotHelper({ fetch });
    helper.defaultParams = { time: 123 };

    let screenshot = await helper.capture('schedules', {
      params: { region: 'NA' },
      viewport: { width: 600 },
    });

    expect(screenshot).toEqual(Buffer.from(png));
    expect(fetch).toHaveBeenCalledWith(
      'https://api.cloudflare.com/client/v4/accounts/account-id/browser-rendering/screenshot?cacheTTL=0',
      {
        method: 'POST',
        headers: {
          Authorization: 'Bearer api-token',
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({
          url: 'https://splatoon3.ink/screenshots/index.html#schedules?time=123&region=NA',
          viewport: {
            width: 600,
            height: 675,
            deviceScaleFactor: 2,
          },
          gotoOptions: { waitUntil: 'load' },
          waitForSelector: {
            selector: '[data-screenshot-ready="true"]',
            timeout: 30_000,
          },
          screenshotOptions: { type: 'png' },
        }),
      },
    );
  });

  it('surfaces a Cloudflare rate limit response without retrying', async () => {
    vi.stubEnv('SCREENSHOT_PROVIDER', 'cloudflare');
    vi.stubEnv('SITE_URL', 'https://splatoon3.ink');
    vi.stubEnv('CLOUDFLARE_ACCOUNT_ID', 'account-id');
    vi.stubEnv('CLOUDFLARE_BROWSER_RUN_API_TOKEN', 'api-token');

    let fetch = vi.fn().mockResolvedValue(new Response(JSON.stringify({
      success: false,
      errors: [{ code: 2001, message: 'Rate limit exceeded' }],
    }), {
      status: 429,
      headers: { 'Content-Type': 'application/json' },
    }));
    let helper = new ScreenshotHelper({ fetch });

    await expect(helper.capture('schedules')).rejects.toThrow(
      'Cloudflare Browser Run screenshot failed (429): Rate limit exceeded',
    );
    expect(fetch).toHaveBeenCalledOnce();
  });

  it('requires the Cloudflare configuration before opening', async () => {
    vi.stubEnv('SCREENSHOT_PROVIDER', 'cloudflare');
    vi.stubEnv('SITE_URL', '');
    vi.stubEnv('CLOUDFLARE_ACCOUNT_ID', '');
    vi.stubEnv('CLOUDFLARE_BROWSER_RUN_API_TOKEN', '');

    let helper = new ScreenshotHelper;

    await expect(helper.open()).rejects.toThrow(
      'Missing Cloudflare screenshot configuration: SITE_URL, CLOUDFLARE_ACCOUNT_ID, CLOUDFLARE_BROWSER_RUN_API_TOKEN',
    );
  });

  it('requires an explicitly supported screenshot provider', async () => {
    vi.stubEnv('SCREENSHOT_PROVIDER', 'auto');

    let helper = new ScreenshotHelper;

    await expect(helper.open()).rejects.toThrow(
      'SCREENSHOT_PROVIDER must be "cloudflare" or "browserless"',
    );
  });
});