import React from 'react';
import { mount, shallow } from 'enzyme';

import { pdfjs } from './entry.jest';

import { PageInternal as Page } from './Page';

import failingPdf from '../__mocks__/_failing_pdf';
import silentlyFailingPdf from '../__mocks__/_silently_failing_pdf';
import {
  loadPDF, makeAsyncCallback, muteConsole, restoreConsole,
} from '../test-utils';

const pdfFile = loadPDF('./__mocks__/_pdf.pdf');
const pdfFile2 = loadPDF('./__mocks__/_pdf2.pdf');

describe('Page', () => {
  // Loaded PDF file
  let pdf;
  let pdf2;

  // Object with basic loaded page information that shall match after successful loading
  const desiredLoadedPage = {};
  const desiredLoadedPage2 = {};
  const desiredLoadedPage3 = {};

  // Callbacks used in registerPage and unregisterPage callbacks
  const registerPageArguments = [];
  let unregisterPageArguments = null;

  beforeAll(async () => {
    pdf = await pdfjs.getDocument({ data: pdfFile.arrayBuffer }).promise;

    const page = await pdf.getPage(1);
    desiredLoadedPage._pageIndex = page._pageIndex;
    desiredLoadedPage._pageInfo = page._pageInfo;

    const page2 = await pdf.getPage(2);
    desiredLoadedPage2._pageIndex = page2._pageIndex;
    desiredLoadedPage2._pageInfo = page2._pageInfo;

    pdf2 = await pdfjs.getDocument({ data: pdfFile2.arrayBuffer }).promise;

    const page3 = await pdf2.getPage(1);
    desiredLoadedPage3._pageIndex = page3._pageIndex;
    desiredLoadedPage3._pageInfo = page3._pageInfo;

    registerPageArguments.push(
      page._pageIndex,
      undefined, // Page reference is not defined in Enzyme
    );
    unregisterPageArguments = page._pageIndex;
  });

  describe('loading', () => {
    it('loads a page and calls onLoadSuccess callback properly', async () => {
      const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();

      shallow(
        <Page
          onLoadSuccess={onLoadSuccess}
          pageIndex={0}
          pdf={pdf}
        />,
      );

      expect.assertions(1);
      await expect(onLoadSuccessPromise).resolves.toMatchObject(desiredLoadedPage);
    });

    it('returns all desired parameters in onLoadSuccess callback', () => {
      const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();

      const component = shallow(
        <Page
          onLoadSuccess={onLoadSuccess}
          pageIndex={0}
          pdf={pdf}
        />,
      );

      expect.assertions(5);
      return onLoadSuccessPromise.then((page) => {
        component.update();
        expect(page.width).toBeDefined();
        expect(page.height).toBeDefined();
        expect(page.originalWidth).toBeDefined();
        expect(page.originalHeight).toBeDefined();
        // Example of a method that got stripped away in the past
        expect(page.getTextContent).toBeInstanceOf(Function);
      });
    });

    it('calls onLoadError when failed to load a page', async () => {
      const { func: onLoadError, promise: onLoadErrorPromise } = makeAsyncCallback();

      muteConsole();

      shallow(
        <Page
          onLoadError={onLoadError}
          pageIndex={0}
          pdf={failingPdf}
        />,
      );

      expect.assertions(1);
      await expect(onLoadErrorPromise).resolves.toBeInstanceOf(Error);

      restoreConsole();
    });

    it('loads page when given pageIndex', () => {
      const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();

      const component = shallow(
        <Page
          onLoadSuccess={onLoadSuccess}
          pageIndex={0}
          pdf={pdf}
        />,
      );

      expect.assertions(1);
      return onLoadSuccessPromise.then(() => {
        expect(component.state().page).toMatchObject(desiredLoadedPage);
      });
    });

    it('loads page when given pageNumber', () => {
      const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();

      const component = shallow(
        <Page
          onLoadSuccess={onLoadSuccess}
          pageNumber={1}
          pdf={pdf}
        />,
      );

      expect.assertions(1);
      return onLoadSuccessPromise.then(() => {
        expect(component.state().page).toMatchObject(desiredLoadedPage);
      });
    });

    it('calls registerPage when loaded a page', async () => {
      const { func: registerPage, promise: registerPagePromise } = makeAsyncCallback();

      shallow(
        <Page
          pageIndex={0}
          pdf={pdf}
          registerPage={registerPage}
        />,
      );

      expect.assertions(1);
      await expect(registerPagePromise).resolves.toMatchObject(registerPageArguments);
    });

    it('calls unregisterPage on unmount', async () => {
      const { func: unregisterPage, promise: nuregisterPagePromise } = makeAsyncCallback();

      const component = shallow(
        <Page
          pageIndex={0}
          pdf={pdf}
          unregisterPage={unregisterPage}
        />,
      );

      component.unmount();

      expect.assertions(1);
      await expect(nuregisterPagePromise).resolves.toBe(unregisterPageArguments);
    });

    it('replaces a page properly when pdf is changed', async () => {
      const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();

      const mountedComponent = shallow(
        <Page
          onLoadSuccess={onLoadSuccess}
          pageIndex={0}
          pdf={pdf}
        />,
      );

      expect.assertions(2);
      await expect(onLoadSuccessPromise).resolves.toMatchObject(desiredLoadedPage);

      const { func: onLoadSuccess2, promise: onLoadSuccessPromise2 } = makeAsyncCallback();

      mountedComponent.setProps({
        onLoadSuccess: onLoadSuccess2,
        pdf: pdf2,
      });

      await expect(onLoadSuccessPromise2).resolves.toMatchObject(desiredLoadedPage3);
    });

    it('replaces a page properly when pageNumber is changed', async () => {
      const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();

      const mountedComponent = shallow(
        <Page
          onLoadSuccess={onLoadSuccess}
          pageIndex={0}
          pdf={pdf}
        />,
      );

      expect.assertions(2);
      await expect(onLoadSuccessPromise).resolves.toMatchObject(desiredLoadedPage);

      const { func: onLoadSuccess2, promise: onLoadSuccessPromise2 } = makeAsyncCallback();

      mountedComponent.setProps({
        onLoadSuccess: onLoadSuccess2,
        pageIndex: 1,
      });

      await expect(onLoadSuccessPromise2).resolves.toMatchObject(desiredLoadedPage2);
    });

    it('throws an error when placed outside Document', () => {
      expect(() => shallow(<Page pageIndex={0} />)).toThrow();
    });
  });

  describe('rendering', () => {
    it('applies className to its wrapper when given a string', () => {
      const className = 'testClassName';

      const component = shallow(
        <Page
          className={className}
          pageIndex={0}
          pdf={pdf}
        />,
      );

      const wrapperClassName = component.find('.react-pdf__Page').prop('className');

      expect(wrapperClassName.includes(className)).toBe(true);
    });

    it('passes container element to inputRef properly', () => {
      const inputRef = jest.fn();

      mount(
        <Page
          inputRef={inputRef}
          pageIndex={1}
          pdf={silentlyFailingPdf}
        />,
      );

      expect(inputRef).toHaveBeenCalled();
      expect(inputRef.mock.calls[0][0]).toBeInstanceOf(HTMLElement);
    });

    it('passes canvas element to PageCanvas properly', async () => {
      const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();

      const canvasRef = jest.fn();

      const component = shallow(
        <Page
          canvasRef={canvasRef}
          onLoadSuccess={onLoadSuccess}
          pageIndex={0}
          pdf={pdf}
        />,
      );

      expect.assertions(1);

      await onLoadSuccessPromise;

      const pageCanvas = component.find('PageCanvas');

      expect(pageCanvas.prop('canvasRef')).toBe(canvasRef);
    });

    it('renders "No page specified." when given neither pageIndex nor pageNumber', () => {
      muteConsole();

      const component = shallow(
        <Page pdf={pdf} />,
      );

      const noData = component.find('Message');

      expect(noData).toHaveLength(1);
      expect(noData.prop('children')).toBe('No page specified.');

      restoreConsole();
    });

    it('renders custom no data message when given nothing and noData is given', () => {
      muteConsole();

      const component = shallow(
        <Page
          noData="Nothing here"
          pdf={pdf}
        />,
      );

      const noData = component.find('Message');

      expect(noData).toHaveLength(1);
      expect(noData.prop('children')).toBe('Nothing here');

      restoreConsole();
    });

    it('renders custom no data message when given nothing and noData is given as a function', () => {
      muteConsole();

      const component = shallow(
        <Page
          noData={() => 'Nothing here'}
          pdf={pdf}
        />,
      );

      const noData = component.find('Message');

      expect(noData).toHaveLength(1);
      expect(noData.prop('children')).toBe('Nothing here');

      restoreConsole();
    });

    it('renders "Loading page…" when loading a page', async () => {
      const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();

      const component = shallow(
        <Page
          onLoadSuccess={onLoadSuccess}
          pageIndex={0}
          pdf={pdf}
        />,
      );

      expect.assertions(2);

      await onLoadSuccessPromise;

      // Since the page loads automatically, we need to simulate its loading state
      component.setState({ page: null });

      const loading = component.find('Message');

      expect(loading).toHaveLength(1);
      expect(loading.prop('children')).toBe('Loading page…');
    });

    it('renders custom loading message when loading a page and loading prop is given', async () => {
      const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();

      const component = shallow(
        <Page
          loading="Loading"
          onLoadSuccess={onLoadSuccess}
          pageIndex={0}
          pdf={pdf}
        />,
      );

      expect.assertions(2);

      await onLoadSuccessPromise;

      // Since the page loads automatically, we need to simulate its loading state
      component.setState({ page: null });

      const loading = component.find('Message');

      expect(loading).toHaveLength(1);
      expect(loading.prop('children')).toBe('Loading');
    });

    it('renders custom loading message when loading a page and loading prop is given as a function', async () => {
      const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();

      const component = shallow(
        <Page
          loading="Loading"
          onLoadSuccess={onLoadSuccess}
          pageIndex={0}
          pdf={pdf}
        />,
      );

      expect.assertions(2);

      await onLoadSuccessPromise;

      // Since the page loads automatically, we need to simulate its loading state
      component.setState({ page: null });

      const loading = component.find('Message');

      expect(loading).toHaveLength(1);
      expect(loading.prop('children')).toBe('Loading');
    });

    it('ignores pageIndex when given pageIndex and pageNumber', async () => {
      const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();

      const component = shallow(
        <Page
          onLoadSuccess={onLoadSuccess}
          pageIndex={1}
          pageNumber={1}
          pdf={pdf}
        />,
      );

      expect.assertions(1);

      await onLoadSuccessPromise;

      expect(component.state().page).toMatchObject(desiredLoadedPage);
    });

    it('orders page to be rendered with default rotation when given nothing', async () => {
      const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();

      const component = shallow(
        <Page
          onLoadSuccess={onLoadSuccess}
          pageIndex={0}
          pdf={pdf}
        />,
      );

      expect.assertions(1);

      await onLoadSuccessPromise;

      expect(component.instance().rotate).toBe(0);
    });

    it('requests page to be rendered with default rotation when given rotate prop', async () => {
      const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();

      const component = shallow(
        <Page
          onLoadSuccess={onLoadSuccess}
          pageIndex={0}
          pdf={pdf}
          rotate={90}
        />,
      );

      expect.assertions(1);

      await onLoadSuccessPromise;

      expect(component.instance().rotate).toBe(90);
    });

    it('requests page to be rendered in canvas mode by default', async () => {
      const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();

      const component = shallow(
        <Page
          onLoadSuccess={onLoadSuccess}
          pageIndex={0}
          pdf={pdf}
        />,
      );

      expect.assertions(1);

      await onLoadSuccessPromise;

      component.update();

      const pageCanvas = component.find('PageCanvas');
      expect(pageCanvas).toHaveLength(1);
    });

    it('requests page not to be rendered when given renderMode = "none"', () => {
      const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();

      const component = shallow(
        <Page
          onLoadSuccess={onLoadSuccess}
          pageIndex={0}
          pdf={pdf}
          renderMode="none"
        />,
      );

      expect.assertions(2);
      return onLoadSuccessPromise.then(() => {
        component.update();
        const pageCanvas = component.find('PageCanvas');
        const pageSVG = component.find('PageSVG');
        expect(pageCanvas).toHaveLength(0);
        expect(pageSVG).toHaveLength(0);
      });
    });

    it('requests page to be rendered in canvas mode when given renderMode = "canvas"', async () => {
      const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();

      const component = shallow(
        <Page
          onLoadSuccess={onLoadSuccess}
          pageIndex={0}
          pdf={pdf}
          renderMode="canvas"
        />,
      );

      expect.assertions(1);

      await onLoadSuccessPromise;

      component.update();

      const pageCanvas = component.find('PageCanvas');
      expect(pageCanvas).toHaveLength(1);
    });

    it('requests page to be rendered in SVG mode when given renderMode = "svg"', async () => {
      const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();

      const component = shallow(
        <Page
          onLoadSuccess={onLoadSuccess}
          pageIndex={0}
          pdf={pdf}
          renderMode="svg"
        />,
      );

      expect.assertions(1);

      await onLoadSuccessPromise;

      component.update();

      const pageSVG = component.find('PageSVG');
      expect(pageSVG).toHaveLength(1);
    });

    it('requests text content to be rendered by default', async () => {
      const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();

      const component = shallow(
        <Page
          onLoadSuccess={onLoadSuccess}
          pageIndex={0}
          pdf={pdf}
        />,
      );

      expect.assertions(1);

      await onLoadSuccessPromise;

      component.update();

      const textLayer = component.find('TextLayer');
      expect(textLayer).toHaveLength(1);
    });

    it('requests text content to be rendered when given renderTextLayer = true', async () => {
      const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();

      const component = shallow(
        <Page
          onLoadSuccess={onLoadSuccess}
          pageIndex={0}
          pdf={pdf}
          renderTextLayer
        />,
      );

      expect.assertions(1);

      await onLoadSuccessPromise;

      component.update();

      const textLayer = component.find('TextLayer');
      expect(textLayer).toHaveLength(1);
    });

    it('does not request text content to be rendered when given renderTextLayer = false', async () => {
      const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();

      const component = shallow(
        <Page
          onLoadSuccess={onLoadSuccess}
          pageIndex={0}
          pdf={pdf}
          renderTextLayer={false}
        />,
      );

      expect.assertions(1);

      await onLoadSuccessPromise;

      component.update();

      const textLayer = component.find('TextLayer');
      expect(textLayer).toHaveLength(0);
    });

    it('renders TextLayer when given renderMode = "canvas"', async () => {
      const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();

      const component = shallow(
        <Page
          onLoadSuccess={onLoadSuccess}
          pageIndex={0}
          pdf={pdf}
          renderMode="canvas"
          renderTextLayer
        />,
      );

      expect.assertions(1);

      await onLoadSuccessPromise;

      component.update();

      const textLayer = component.find('TextLayer');
      expect(textLayer).toHaveLength(1);
    });

    it('renders TextLayer when given renderMode = "svg"', async () => {
      const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();

      const component = shallow(
        <Page
          onLoadSuccess={onLoadSuccess}
          pageIndex={0}
          pdf={pdf}
          renderMode="svg"
          renderTextLayer
        />,
      );

      expect.assertions(1);

      await onLoadSuccessPromise;

      component.update();
      const textLayer = component.find('TextLayer');
      expect(textLayer).toHaveLength(1);
    });

    it('requests annotations to be rendered by default', async () => {
      const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();

      const component = shallow(
        <Page
          onLoadSuccess={onLoadSuccess}
          pageIndex={0}
          pdf={pdf}
        />,
      );

      expect.assertions(1);

      await onLoadSuccessPromise;

      component.update();

      const annotationLayer = component.find('AnnotationLayer');
      expect(annotationLayer).toHaveLength(1);
    });

    it('requests annotations to be rendered when given renderAnnotationLayer = true', async () => {
      const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();

      const component = shallow(
        <Page
          onLoadSuccess={onLoadSuccess}
          pageIndex={0}
          pdf={pdf}
          renderAnnotationLayer
        />,
      );

      expect.assertions(1);

      await onLoadSuccessPromise;

      component.update();

      const annotationLayer = component.find('AnnotationLayer');
      expect(annotationLayer).toHaveLength(1);
    });

    it('does not request annotations to be rendered when given renderAnnotationLayer = false', async () => {
      const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();

      const component = shallow(
        <Page
          onLoadSuccess={onLoadSuccess}
          pageIndex={0}
          pdf={pdf}
          renderAnnotationLayer={false}
        />,
      );

      expect.assertions(1);

      await onLoadSuccessPromise;

      component.update();

      const annotationLayer = component.find('AnnotationLayer');
      expect(annotationLayer).toHaveLength(0);
    });
  });

  it('requests page to be rendered at its original size given nothing', () => {
    const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();

    const component = shallow(
      <Page
        onLoadSuccess={onLoadSuccess}
        pageIndex={0}
        pdf={pdf}
      />,
    );

    expect.assertions(1);

    return onLoadSuccessPromise.then((page) => {
      component.update();

      expect(page.width).toEqual(page.originalWidth);
    });
  });

  it('requests page to be rendered with a proper scale when given scale', () => {
    const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();
    const scale = 1.5;

    const component = shallow(
      <Page
        onLoadSuccess={onLoadSuccess}
        pageIndex={0}
        pdf={pdf}
        scale={scale}
      />,
    );

    expect.assertions(1);

    return onLoadSuccessPromise.then((page) => {
      component.update();

      expect(page.width).toEqual(page.originalWidth * scale);
    });
  });

  it('requests page to be rendered with a proper scale when given width', () => {
    const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();
    const width = 600;

    const component = shallow(
      <Page
        onLoadSuccess={onLoadSuccess}
        pageIndex={0}
        pdf={pdf}
        width={width}
      />,
    );

    expect.assertions(1);

    return onLoadSuccessPromise.then((page) => {
      component.update();

      expect(page.width).toEqual(width);
    });
  });

  it('requests page to be rendered with a proper scale when given width and scale (multiplies)', () => {
    const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();
    const width = 600;
    const scale = 1.5;

    const component = shallow(
      <Page
        onLoadSuccess={onLoadSuccess}
        pageIndex={0}
        pdf={pdf}
        scale={scale}
        width={width}
      />,
    );

    expect.assertions(1);

    return onLoadSuccessPromise.then((page) => {
      component.update();

      expect(page.width).toBeCloseTo(width * scale);
    });
  });

  it('requests page to be rendered with a proper scale when given height', () => {
    const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();
    const height = 850;

    const component = shallow(
      <Page
        height={height}
        onLoadSuccess={onLoadSuccess}
        pageIndex={0}
        pdf={pdf}
      />,
    );

    expect.assertions(1);

    return onLoadSuccessPromise.then((page) => {
      component.update();

      expect(page.height).toEqual(height);
    });
  });

  it('requests page to be rendered with a proper scale when given height and scale (multiplies)', () => {
    const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();
    const height = 850;
    const scale = 1.5;

    const component = shallow(
      <Page
        height={height}
        onLoadSuccess={onLoadSuccess}
        pageIndex={0}
        pdf={pdf}
        scale={scale}
      />,
    );

    expect.assertions(1);

    return onLoadSuccessPromise.then((page) => {
      component.update();

      expect(page.height).toBeCloseTo(height * scale);
    });
  });

  it('requests page to be rendered with a proper scale when given width and height (ignores height)', () => {
    const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();
    const width = 600;
    const height = 100;

    const component = shallow(
      <Page
        height={height}
        onLoadSuccess={onLoadSuccess}
        pageIndex={0}
        pdf={pdf}
        width={width}
      />,
    );

    expect.assertions(2);

    return onLoadSuccessPromise.then((page) => {
      component.update();

      expect(page.width).toEqual(width);
      // Expect proportions to be correct even though invalid height was provided
      expect(page.height).toEqual(page.originalHeight * (page.width / page.originalWidth));
    });
  });

  it('requests page to be rendered with a proper scale when given width, height and scale (ignores height, multiplies)', () => {
    const { func: onLoadSuccess, promise: onLoadSuccessPromise } = makeAsyncCallback();
    const width = 600;
    const height = 100;
    const scale = 1.5;

    const component = shallow(
      <Page
        height={height}
        onLoadSuccess={onLoadSuccess}
        pageIndex={0}
        pdf={pdf}
        scale={scale}
        width={width}
      />,
    );

    expect.assertions(2);

    return onLoadSuccessPromise.then((page) => {
      component.update();

      expect(page.width).toBeCloseTo(width * scale);
      // Expect proportions to be correct even though invalid height was provided
      expect(page.height).toEqual(page.originalHeight * (page.width / page.originalWidth));
    });
  });

  it('calls onClick callback when clicked a page (sample of mouse events family)', () => {
    const onClick = jest.fn();

    const component = mount(
      <Page
        onClick={onClick}
        pdf={pdf}
      />,
    );

    const page = component.find('.react-pdf__Page');
    page.simulate('click');

    expect(onClick).toHaveBeenCalled();
  });

  it('calls onTouchStart callback when touched a page (sample of touch events family)', () => {
    const onTouchStart = jest.fn();

    const component = mount(
      <Page
        onTouchStart={onTouchStart}
        pdf={pdf}
      />,
    );

    const page = component.find('.react-pdf__Page');
    page.simulate('touchstart');

    expect(onTouchStart).toHaveBeenCalled();
  });
});