"""
    weasyprint.tests.test_api
    -------------------------

    Test the public API.

"""

import gzip
import io
import os
import sys
import unicodedata
import zlib
from pathlib import Path
from urllib.parse import urljoin, uses_relative

import py
import pytest
from PIL import Image
from weasyprint import CSS, HTML, __main__, default_url_fetcher
from weasyprint.document import resolve_links
from weasyprint.urls import path2url

from .test_draw import assert_pixels_equal, parse_pixels
from .testing_utils import (
    FakeHTML, assert_no_logs, capture_logs, http_server, resource_filename)


def _test_resource(class_, basename, check, **kwargs):
    """Common code for testing the HTML and CSS classes."""
    absolute_filename = resource_filename(basename)
    absolute_path = Path(absolute_filename)
    url = path2url(absolute_filename)
    check(class_(absolute_filename, **kwargs))
    check(class_(absolute_path, **kwargs))
    check(class_(guess=absolute_filename, **kwargs))
    check(class_(guess=absolute_path, **kwargs))
    check(class_(filename=absolute_filename, **kwargs))
    check(class_(filename=absolute_path, **kwargs))
    check(class_(url, **kwargs))
    check(class_(guess=url, **kwargs))
    url = path2url(absolute_filename.encode('utf-8'))
    check(class_(url=url, **kwargs))
    with open(absolute_filename, 'rb') as fd:
        check(class_(fd, **kwargs))
    with open(absolute_filename, 'rb') as fd:
        check(class_(guess=fd, **kwargs))
    with open(absolute_filename, 'rb') as fd:
        check(class_(file_obj=fd, **kwargs))
    with open(absolute_filename, 'rb') as fd:
        content = fd.read()
    py.path.local(os.path.dirname(__file__)).chdir()
    relative_filename = os.path.join('resources', basename)
    relative_path = Path(relative_filename)
    check(class_(relative_filename, **kwargs))
    check(class_(relative_path, **kwargs))
    kwargs.pop('base_url', None)
    check(class_(string=content, base_url=relative_filename, **kwargs))
    encoding = kwargs.get('encoding') or 'utf8'
    check(class_(string=content.decode(encoding),  # unicode
                 base_url=relative_filename, **kwargs))
    with pytest.raises(TypeError):
        class_(filename='foo', url='bar')


def _check_doc1(html, has_base_url=True):
    """Check that a parsed HTML document looks like resources/doc1.html"""
    root = html.etree_element
    assert root.tag == 'html'
    assert [child.tag for child in root] == ['head', 'body']
    _head, body = root
    assert [child.tag for child in body] == ['h1', 'p', 'ul', 'div']
    h1, p, ul, div = body
    assert h1.text == 'WeasyPrint test document (with Ünicōde)'
    if has_base_url:
        url = urljoin(html.base_url, 'pattern.png')
        assert url.startswith('file:')
        assert url.endswith('tests/resources/pattern.png')
    else:
        assert html.base_url is None


def _run(args, stdin=b''):
    stdin = io.BytesIO(stdin)
    stdout = io.BytesIO()
    try:
        __main__.HTML = FakeHTML
        __main__.main(args.split(), stdin=stdin, stdout=stdout)
    finally:
        __main__.HTML = HTML
    return stdout.getvalue()


class _fake_file:
    def __init__(self):
        self.chunks = []

    def write(self, data):
        self.chunks.append(bytes(data[:]))

    def getvalue(self):
        return b''.join(self.chunks)


def _png_size(png_bytes):
    image = Image.open(io.BytesIO(png_bytes))
    return image.width, image.height


def _round_meta(pages):
    """Eliminate errors of floating point arithmetic for metadata."""
    for page in pages:
        anchors = page.anchors
        for anchor_name, (pos_x, pos_y) in anchors.items():
            anchors[anchor_name] = round(pos_x, 6), round(pos_y, 6)
        links = page.links
        for i, link in enumerate(links):
            link_type, target, rectangle, download_name = link
            pos_x, pos_y, width, height = rectangle
            link = (
                link_type, target,
                (round(pos_x, 6), round(pos_y, 6),
                 round(width, 6), round(height, 6)),
                download_name)
            links[i] = link
        bookmarks = page.bookmarks
        for i, (level, label, (pos_x, pos_y), state) in enumerate(bookmarks):
            bookmarks[i] = (
                level, label, (round(pos_x, 6), round(pos_y, 6)), state)


@assert_no_logs
def test_html_parsing():
    """Test the constructor for the HTML class."""
    _test_resource(FakeHTML, 'doc1.html', _check_doc1)
    _test_resource(FakeHTML, 'doc1_UTF-16BE.html', _check_doc1,
                   encoding='UTF-16BE')

    py.path.local(os.path.dirname(__file__)).chdir()
    filename = os.path.join('resources', 'doc1.html')
    with open(filename, encoding='utf-8') as fd:
        string = fd.read()
    _test_resource(FakeHTML, 'doc1.html', _check_doc1, base_url=filename)
    _check_doc1(FakeHTML(string=string, base_url=filename))
    _check_doc1(FakeHTML(string=string), has_base_url=False)
    string_with_meta = string.replace(
        '<meta', '<base href="resources/"><meta')
    _check_doc1(FakeHTML(string=string_with_meta, base_url='.'))


@assert_no_logs
def test_css_parsing():
    """Test the constructor for the CSS class."""
    def check_css(css):
        """Check that a parsed stylsheet looks like resources/utf8-test.css"""
        # Using 'encoding' adds a CSSCharsetRule
        h1_rule, = css.matcher.lower_local_name_selectors['h1']
        assert h1_rule[3] == 'before'
        assert h1_rule[4][0][0] == 'content'
        assert h1_rule[4][0][1][0][1] == 'I løvë Unicode'
        assert h1_rule[4][1][0] == 'background_image'
        assert h1_rule[4][1][1][0][0] == 'url'
        assert h1_rule[4][1][1][0][1].startswith('file:')
        assert h1_rule[4][1][1][0][1].endswith('tests/resources/pattern.png')

    _test_resource(CSS, 'utf8-test.css', check_css)
    _test_resource(CSS, 'latin1-test.css', check_css, encoding='latin1')


def check_png_pattern(png_bytes, x2=False, blank=False, rotated=False):
    if blank:
        expected_pixels = '''
            ________
            ________
            ________
            ________
            ________
            ________
            ________
            ________
        '''
        size = 8
    elif x2:
        expected_pixels = '''
            ________________
            ________________
            ________________
            ________________
            ____rrBBBBBB____
            ____rrBBBBBB____
            ____BBBBBBBB____
            ____BBBBBBBB____
            ____BBBBBBBB____
            ____BBBBBBBB____
            ____BBBBBBBB____
            ____BBBBBBBB____
            ________________
            ________________
            ________________
            ________________
        '''
        size = 16
    elif rotated:
        expected_pixels = '''
            ________
            ________
            __BBBB__
            __BBBB__
            __BBBB__
            __rBBB__
            ________
            ________
        '''
        size = 8
    else:
        expected_pixels = '''
            ________
            ________
            __rBBB__
            __BBBB__
            __BBBB__
            __BBBB__
            ________
            ________
        '''
        size = 8
    image = Image.open(io.BytesIO(png_bytes))
    assert_pixels_equal(
        'api_png', size, size, image.getdata(),
        parse_pixels(expected_pixels))


@assert_no_logs
def test_python_render(tmpdir):
    """Test rendering with the Python API."""
    base_url = resource_filename('dummy.html')
    html_string = '<body><img src=pattern.png>'
    css_string = '''
        @page { margin: 2px; size: 8px; background: #fff }
        body { margin: 0; font-size: 0 }
        img { image-rendering: pixelated }

        @media screen { img { transform: rotate(-90deg) } }
    '''
    html = FakeHTML(string=html_string, base_url=base_url)
    css = CSS(string=css_string)

    png_bytes = html.write_png(stylesheets=[css])
    pdf_bytes = html.write_pdf(stylesheets=[css])
    assert png_bytes.startswith(b'\211PNG\r\n\032\n')
    assert pdf_bytes.startswith(b'%PDF')
    check_png_pattern(png_bytes)
    # TODO: check PDF content? How?

    png_file = _fake_file()
    html.write_png(png_file, stylesheets=[css])
    assert png_file.getvalue() == png_bytes
    pdf_file = _fake_file()
    html.write_pdf(pdf_file, stylesheets=[css])
    # assert pdf_file.read_binary() == pdf_bytes

    png_file = tmpdir.join('1.png')
    pdf_file = tmpdir.join('1.pdf')
    html.write_png(png_file.strpath, stylesheets=[css])
    html.write_pdf(pdf_file.strpath, stylesheets=[css])
    assert png_file.read_binary() == png_bytes
    # assert pdf_file.read_binary() == pdf_bytes

    png_file = tmpdir.join('2.png')
    pdf_file = tmpdir.join('2.pdf')
    with open(png_file.strpath, 'wb') as png_fd:
        html.write_png(png_fd, stylesheets=[css])
    with open(pdf_file.strpath, 'wb') as pdf_fd:
        html.write_pdf(pdf_fd, stylesheets=[css])
    assert png_file.read_binary() == png_bytes
    # assert pdf_file.read_binary() == pdf_bytes

    x2_png_bytes = html.write_png(stylesheets=[css], resolution=192)
    check_png_pattern(x2_png_bytes, x2=True)

    screen_css = CSS(string=css_string, media_type='screen')
    rotated_png_bytes = html.write_png(stylesheets=[screen_css])
    check_png_pattern(rotated_png_bytes, rotated=True)

    assert FakeHTML(
        string=html_string, base_url=base_url, media_type='screen'
    ).write_png(
        stylesheets=[io.BytesIO(css_string.encode('utf8'))]
    ) == rotated_png_bytes
    assert FakeHTML(
        string=f'<style>{css_string}</style>{html_string}',
        base_url=base_url, media_type='screen'
    ).write_png() == rotated_png_bytes


@assert_no_logs
def test_command_line_render(tmpdir):
    css = b'''
        @page { margin: 2px; size: 8px; background: #fff }
        @media screen { img { transform: rotate(-90deg) } }
        body { margin: 0; font-size: 0 }
    '''
    html = b'<body><img src=pattern.png>'
    combined = b'<style>' + css + b'</style>' + html
    linked = b'<link rel=stylesheet href=style.css>' + html

    py.path.local(resource_filename('')).chdir()
    # Reference
    html_obj = FakeHTML(string=combined, base_url='dummy.html')
    pdf_bytes = html_obj.write_pdf()
    rotated_pdf_bytes = FakeHTML(
        string=combined, base_url='dummy.html',
        media_type='screen').write_pdf()

    tmpdir.chdir()
    with open(resource_filename('pattern.png'), 'rb') as pattern_fd:
        pattern_bytes = pattern_fd.read()
    tmpdir.join('pattern.png').write_binary(pattern_bytes)
    tmpdir.join('no_css.html').write_binary(html)
    tmpdir.join('combined.html').write_binary(combined)
    tmpdir.join('combined-UTF-16BE.html').write_binary(
        combined.decode('ascii').encode('UTF-16BE'))
    tmpdir.join('linked.html').write_binary(linked)
    tmpdir.join('style.css').write_binary(css)

    _run('combined.html out2.pdf')
    assert tmpdir.join('out2.pdf').read_binary() == pdf_bytes

    _run('combined-UTF-16BE.html out3.pdf --encoding UTF-16BE')
    assert tmpdir.join('out3.pdf').read_binary() == pdf_bytes

    _run(tmpdir.join('combined.html').strpath + ' out4.pdf')
    assert tmpdir.join('out4.pdf').read_binary() == pdf_bytes

    _run(path2url(tmpdir.join('combined.html').strpath) + ' out5.pdf')
    assert tmpdir.join('out5.pdf').read_binary() == pdf_bytes

    _run('linked.html --debug out6.pdf')  # test relative URLs
    assert tmpdir.join('out6.pdf').read_binary() == pdf_bytes

    _run('combined.html --verbose out7')
    _run('combined.html --quiet out8')
    assert tmpdir.join('out7').read_binary() == pdf_bytes
    assert tmpdir.join('out8').read_binary() == pdf_bytes

    _run('no_css.html out9.pdf')
    _run('no_css.html out10.pdf -s style.css')
    assert tmpdir.join('out9.pdf').read_binary() != pdf_bytes
    assert tmpdir.join('out10.pdf').read_binary() == pdf_bytes

    stdout = _run('combined.html -')
    assert stdout == pdf_bytes

    _run('- out11.pdf', stdin=combined)
    assert tmpdir.join('out11.pdf').read_binary() == pdf_bytes

    stdout = _run('- -', stdin=combined)
    assert stdout == pdf_bytes

    _run('combined.html out13.pdf --media-type screen')
    _run('combined.html out12.pdf -m screen')
    _run('linked.html out14.pdf -m screen')
    assert tmpdir.join('out12.pdf').read_binary() == rotated_pdf_bytes
    assert tmpdir.join('out13.pdf').read_binary() == rotated_pdf_bytes
    assert tmpdir.join('out14.pdf').read_binary() == rotated_pdf_bytes

    stdout = _run('combined.html -')
    assert stdout.count(b'attachment') == 0
    stdout = _run('combined.html -')
    assert stdout.count(b'attachment') == 0
    stdout = _run('-a pattern.png combined.html -')
    assert stdout.count(b'attachment') == 1
    stdout = _run('-a style.css -a pattern.png combined.html -')
    assert stdout.count(b'attachment') == 2

    os.mkdir('subdirectory')
    py.path.local('subdirectory').chdir()
    with capture_logs() as logs:
        stdout = _run('- -', stdin=combined)
    assert len(logs) == 1
    assert logs[0].startswith('ERROR: Failed to load image')
    assert stdout.startswith(b'%PDF')

    with capture_logs() as logs:
        stdout = _run('--base-url= - -', stdin=combined)
    assert len(logs) == 1
    assert logs[0].startswith(
        'ERROR: Relative URI reference without a base URI')
    assert stdout.startswith(b'%PDF')

    stdout = _run('--base-url .. - -', stdin=combined)
    assert stdout == pdf_bytes

    with pytest.raises(SystemExit):
        _run('--info')

    with pytest.raises(SystemExit):
        _run('--version')


@assert_no_logs
def test_unicode_filenames(tmpdir):
    """Test non-ASCII filenames both in Unicode or bytes form."""
    # Replicate pattern.png in CSS so that base_url does not matter.
    html = b'''
        <style>
            @page { margin: 2px; size: 8px; background: #fff }
            html { background: #00f; }
            body { background: #f00; width: 1px; height: 1px }
        </style>
        <body>
    '''
    png_bytes = FakeHTML(string=html).write_png()
    check_png_pattern(png_bytes)
    unicode_filename = 'Unicödé'
    if sys.platform.startswith('darwin'):  # pragma: no cover
        unicode_filename = unicodedata.normalize('NFD', unicode_filename)

    tmpdir.chdir()
    tmpdir.join(unicode_filename).write(html)
    bytes_file, = tmpdir.listdir()
    assert bytes_file.basename == unicode_filename

    assert FakeHTML(unicode_filename).write_png() == png_bytes
    assert FakeHTML(bytes_file.strpath).write_png() == png_bytes

    os.remove(unicode_filename)
    assert tmpdir.listdir() == []

    FakeHTML(string=html).write_png(unicode_filename)
    assert bytes_file.read_binary() == png_bytes


@assert_no_logs
def test_low_level_api():
    html = FakeHTML(string='<body>')
    css = CSS(string='''
        @page { margin: 2px; size: 8px; background: #fff }
        html { background: #00f; }
        body { background: #f00; width: 1px; height: 1px }
    ''')
    pdf_bytes = html.write_pdf(stylesheets=[css])
    assert pdf_bytes.startswith(b'%PDF')
    # TODO: check PDF content? How?
    # assert html.render([css]).write_pdf() == pdf_bytes

    png_bytes = html.write_png(stylesheets=[css])
    document = html.render([css])
    page, = document.pages
    assert page.width == 8
    assert page.height == 8
    assert document.write_png() == png_bytes
    assert document.copy([page]).write_png() == png_bytes

    document = html.render([css])
    page, = document.pages
    assert (page.width, page.height) == (8, 8)
    png_bytes = document.write_png(resolution=192)
    check_png_pattern(png_bytes, x2=True)

    document = html.render([css])
    page, = document.pages
    assert (page.width, page.height) == (8, 8)
    # A resolution that is not multiple of 96:
    assert _png_size(document.write_png(resolution=145.2)) == (12, 12)

    document = FakeHTML(string='''
        <style>
            @page:first { size: 5px 10px } @page { size: 6px 4px }
            p { page-break-before: always }
        </style>
        <p></p>
        <p></p>
    ''').render()
    page_1, page_2 = document.pages
    assert (page_1.width, page_1.height) == (5, 10)
    assert (page_2.width, page_2.height) == (6, 4)

    result = document.write_png()
    # (Max of both widths, Sum of both heights)
    assert _png_size(result) == (6, 14)
    assert document.copy([page_1, page_2]).write_png() == result
    assert _png_size(document.copy([page_1]).write_png()) == (5, 10)
    assert _png_size(document.copy([page_2]).write_png()) == (6, 4)


@pytest.mark.parametrize('html, expected_by_page, round_', (
    ('''
        <style>* { height: 10px }</style>
        <h1>a</h1>
        <h4 style="page-break-after: always">b</h4>
        <h3 style="position: relative; top: 2px; left: 3px">c</h3>
        <h2>d</h2>
        <h1>e</h1>
    ''', [
        [(1, 'a', (0, 0), 'open'), (4, 'b', (0, 10), 'open')],
        [(3, 'c', (3, 2), 'open'), (2, 'd', (0, 10), 'open'),
         (1, 'e', (0, 20), 'open')],
    ], False),
    ('''
        <style>
            * { height: 90px; margin: 0 0 10px 0 }
        </style>
        <h1>Title 1</h1>
        <h1>Title 2</h1>
        <h2 style="position: relative; left: 20px">Title 3</h2>
        <h2>Title 4</h2>
        <h3>Title 5</h3>
        <span style="display: block; page-break-before: always"></span>
        <h2>Title 6</h2>
        <h1>Title 7</h1>
        <h2>Title 8</h2>
        <h3>Title 9</h3>
        <h1>Title 10</h1>
        <h2>Title 11</h2>
    ''', [
        [
            (1, 'Title 1', (0, 0), 'open'),
            (1, 'Title 2', (0, 100), 'open'),
            (2, 'Title 3', (20, 200), 'open'),
            (2, 'Title 4', (0, 300), 'open'),
            (3, 'Title 5', (0, 400), 'open')
        ], [
            (2, 'Title 6', (0, 100), 'open'),
            (1, 'Title 7', (0, 200), 'open'),
            (2, 'Title 8', (0, 300), 'open'),
            (3, 'Title 9', (0, 400), 'open'),
            (1, 'Title 10', (0, 500), 'open'),
            (2, 'Title 11', (0, 600), 'open')
        ],
    ], False),
    ('''
        <style>* { height: 10px }</style>
        <h2>A</h2> <p>depth 1</p>
        <h4>B</h4> <p>depth 2</p>
        <h2>C</h2> <p>depth 1</p>
        <h3>D</h3> <p>depth 2</p>
        <h4>E</h4> <p>depth 3</p>
    ''', [[
        (2, 'A', (0, 0), 'open'),
        (4, 'B', (0, 20), 'open'),
        (2, 'C', (0, 40), 'open'),
        (3, 'D', (0, 60), 'open'),
        (4, 'E', (0, 80), 'open'),
    ]], False),
    ('''
        <style>* { height: 10px; font-size: 0 }</style>
        <h2>A</h2> <p>h2 depth 1</p>
        <h4>B</h4> <p>h4 depth 2</p>
        <h3>C</h3> <p>h3 depth 2</p>
        <h5>D</h5> <p>h5 depth 3</p>
        <h1>E</h1> <p>h1 depth 1</p>
        <h2>F</h2> <p>h2 depth 2</p>
        <h2>G</h2> <p>h2 depth 2</p>
        <h4>H</h4> <p>h4 depth 3</p>
        <h1>I</h1> <p>h1 depth 1</p>
    ''', [[
        (2, 'A', (0, 0), 'open'),
        (4, 'B', (0, 20), 'open'),
        (3, 'C', (0, 40), 'open'),
        (5, 'D', (0, 60), 'open'),
        (1, 'E', (0, 70), 'open'),
        (2, 'F', (0, 90), 'open'),
        (2, 'G', (0, 110), 'open'),
        (4, 'H', (0, 130), 'open'),
        (1, 'I', (0, 150), 'open'),
    ]], False),
    ('<h1>é', [
        [(1, 'é', (0, 0), 'open')]
    ], False),
    ('''
        <h1 style="transform: translateX(50px)">!
    ''', [
        [(1, '!', (50, 0), 'open')]
    ], False),
    ('''
        <style>
          img { display: block; bookmark-label: attr(alt); bookmark-level: 1 }
        </style>
        <img src="%s" alt="Chocolate" />
    ''' % path2url(resource_filename('pattern.png')),
     [[(1, 'Chocolate', (0, 0), 'open')]], False),
    ('''
        <h1 style="transform-origin: 0 0;
                   transform: rotate(90deg) translateX(50px)">!
    ''', [[(1, '!', (0, 50), 'open')]], True),
    ('''
        <body style="transform-origin: 0 0; transform: rotate(90deg)">
        <h1 style="transform: translateX(50px)">!
    ''', [[(1, '!', (0, 50), 'open')]], True),
))
@assert_no_logs
def test_assert_bookmarks(html, expected_by_page, round_):
    document = FakeHTML(string=html).render()
    if round_:
        _round_meta(document.pages)
    assert [page.bookmarks for page in document.pages] == expected_by_page


@assert_no_logs
def test_links():
    def assert_links(html, expected_links_by_page, expected_anchors_by_page,
                     expected_resolved_links,
                     base_url=resource_filename('<inline HTML>'),
                     warnings=(), round=False):
        with capture_logs() as logs:
            document = FakeHTML(string=html, base_url=base_url).render()
            if round:
                _round_meta(document.pages)
            resolved_links = list(resolve_links(document.pages))
        assert len(logs) == len(warnings)
        for message, expected in zip(logs, warnings):
            assert expected in message
        assert [p.links for p in document.pages] == expected_links_by_page
        assert [p.anchors for p in document.pages] == expected_anchors_by_page
        assert resolved_links == expected_resolved_links

    assert_links('''
        <style>
            body { font-size: 10px; line-height: 2; width: 200px }
            p { height: 90px; margin: 0 0 10px 0 }
            img { width: 30px; vertical-align: top }
        </style>
        <p><a href="http://weasyprint.org"><img src=pattern.png></a></p>
        <p style="padding: 0 10px"><a
            href="#lipsum"><img style="border: solid 1px"
                                src=pattern.png></a></p>
        <p id=hello>Hello, World</p>
        <p id=lipsum>
            <a style="display: block; page-break-before: always; height: 30px"
               href="#hel%6Co"></a>
        </p>
    ''', [
        [
            ('external', 'http://weasyprint.org', (0, 0, 30, 20), None),
            ('external', 'http://weasyprint.org', (0, 0, 30, 30), None),
            ('internal', 'lipsum', (10, 100, 42, 120), None),
            ('internal', 'lipsum', (10, 100, 42, 132), None)
        ],
        [('internal', 'hello', (0, 0, 200, 30), None)],
    ], [
        {'hello': (0, 200)},
        {'lipsum': (0, 0)}
    ], [
        (
            [
                ('external', 'http://weasyprint.org', (0, 0, 30, 20), None),
                ('external', 'http://weasyprint.org', (0, 0, 30, 30), None),
                ('internal', 'lipsum', (10, 100, 42, 120), None),
                ('internal', 'lipsum', (10, 100, 42, 132), None)
            ],
            [('hello', 0, 200)],
        ),
        (
            [
                ('internal', 'hello', (0, 0, 200, 30), None)
            ],
            [('lipsum', 0, 0)]),
    ])

    assert_links(
        '''
            <body style="width: 200px">
            <a href="../lipsum/é_%E9" style="display: block; margin: 10px 5px">
        ''', [[('external', 'http://weasyprint.org/foo/lipsum/%C3%A9_%E9',
                (5, 10, 195, 10), None)]],
        [{}], [([('external', 'http://weasyprint.org/foo/lipsum/%C3%A9_%E9',
                  (5, 10, 195, 10), None)], [])],
        base_url='http://weasyprint.org/foo/bar/')

    assert_links(
        '''
            <body style="width: 200px">
            <div style="display: block; margin: 10px 5px;
                        -weasy-link: url(../lipsum/é_%E9)">
        ''', [[('external', 'http://weasyprint.org/foo/lipsum/%C3%A9_%E9',
                (5, 10, 195, 10), None)]],
        [{}], [([('external', 'http://weasyprint.org/foo/lipsum/%C3%A9_%E9',
                  (5, 10, 195, 10), None)], [])],
        base_url='http://weasyprint.org/foo/bar/')

    # Relative URI reference without a base URI: allowed for links
    assert_links(
        '''
            <body style="width: 200px">
            <a href="../lipsum" style="display: block; margin: 10px 5px">
        ''', [[('external', '../lipsum', (5, 10, 195, 10), None)]], [{}],
        [([('external', '../lipsum', (5, 10, 195, 10), None)], [])],
        base_url=None)

    # Relative URI reference without a base URI: not supported for -weasy-link
    assert_links(
        '''
            <body style="width: 200px">
            <div style="-weasy-link: url(../lipsum);
                        display: block; margin: 10px 5px">
        ''', [[]], [{}], [([], [])], base_url=None, warnings=[
            'WARNING: Ignored `-weasy-link: url(../lipsum)` at 1:1, '
            'Relative URI reference without a base URI'])

    # Internal or absolute URI reference without a base URI: OK
    assert_links(
        '''
            <body style="width: 200px">
            <a href="#lipsum" id="lipsum"
                style="display: block; margin: 10px 5px"></a>
            <a href="http://weasyprint.org/" style="display: block"></a>
        ''', [[
            ('internal', 'lipsum', (5, 10, 195, 10), None),
            ('external', 'http://weasyprint.org/', (0, 10, 200, 10), None)]],
        [{'lipsum': (5, 10)}],
        [([('internal', 'lipsum', (5, 10, 195, 10), None),
           ('external', 'http://weasyprint.org/', (0, 10, 200, 10), None)],
          [('lipsum', 5, 10)])],
        base_url=None)

    assert_links(
        '''
            <body style="width: 200px">
            <div style="-weasy-link: url(#lipsum);
                        margin: 10px 5px" id="lipsum">
        ''',
        [[('internal', 'lipsum', (5, 10, 195, 10), None)]],
        [{'lipsum': (5, 10)}],
        [([('internal', 'lipsum', (5, 10, 195, 10), None)],
          [('lipsum', 5, 10)])],
        base_url=None)

    assert_links(
        '''
            <style> a { display: block; height: 15px } </style>
            <body style="width: 200px">
                <a href="#lipsum"></a>
                <a href="#missing" id="lipsum"></a>
        ''',
        [[('internal', 'lipsum', (0, 0, 200, 15), None),
          ('internal', 'missing', (0, 15, 200, 30), None)]],
        [{'lipsum': (0, 15)}],
        [([('internal', 'lipsum', (0, 0, 200, 15), None)],
          [('lipsum', 0, 15)])],
        base_url=None,
        warnings=[
            'ERROR: No anchor #missing for internal URI reference'])

    assert_links(
        '''
            <body style="width: 100px; transform: translateY(100px)">
            <a href="#lipsum" id="lipsum" style="display: block; height: 20px;
                transform: rotate(90deg) scale(2)">
        ''',
        [[('internal', 'lipsum', (30, 10, 70, 210), None)]],
        [{'lipsum': (70, 10)}],
        [([('internal', 'lipsum', (30, 10, 70, 210), None)],
          [('lipsum', 70, 10)])],
        round=True)

    # Download for attachment
    assert_links(
        '''
            <body style="width: 200px">
            <a rel=attachment href="pattern.png" download="wow.png"
                style="display: block; margin: 10px 5px">
        ''', [[('attachment', 'pattern.png',
                (5, 10, 195, 10), 'wow.png')]],
        [{}], [([('attachment', 'pattern.png',
                  (5, 10, 195, 10), 'wow.png')], [])],
        base_url=None)


# Make relative URL references work with our custom URL scheme.
uses_relative.append('weasyprint-custom')


@assert_no_logs
def test_url_fetcher():
    filename = resource_filename('pattern.png')
    with open(filename, 'rb') as pattern_fd:
        pattern_png = pattern_fd.read()

    def fetcher(url):
        if url == 'weasyprint-custom:foo/%C3%A9_%e9_pattern':
            return {'string': pattern_png, 'mime_type': 'image/png'}
        elif url == 'weasyprint-custom:foo/bar.css':
            return {
                'string': 'body { background: url(é_%e9_pattern)',
                'mime_type': 'text/css'}
        elif url == 'weasyprint-custom:foo/bar.no':
            return {
                'string': 'body { background: red }',
                'mime_type': 'text/no'}
        else:
            return default_url_fetcher(url)

    base_url = resource_filename('dummy.html')
    css = CSS(string='''
        @page { size: 8px; margin: 2px; background: #fff }
        body { margin: 0; font-size: 0 }
    ''', base_url=base_url)

    def test(html, blank=False):
        html = FakeHTML(string=html, url_fetcher=fetcher, base_url=base_url)
        check_png_pattern(html.write_png(stylesheets=[css]), blank=blank)

    test('<body><img src="pattern.png">')  # Test a "normal" URL
    test(f'<body><img src="{Path(filename).as_uri()}">')
    test(f'<body><img src="{Path(filename).as_uri()}?ignored">')
    test('<body><img src="weasyprint-custom:foo/é_%e9_pattern">')
    test('<body style="background: url(weasyprint-custom:foo/é_%e9_pattern)">')
    test('<body><li style="list-style: inside '
         'url(weasyprint-custom:foo/é_%e9_pattern)">')
    test('<link rel=stylesheet href="weasyprint-custom:foo/bar.css"><body>')
    test('<style>@import "weasyprint-custom:foo/bar.css";</style><body>')
    test('<style>@import url(weasyprint-custom:foo/bar.css);</style><body>')
    test('<style>@import url("weasyprint-custom:foo/bar.css");</style><body>')
    test('<link rel=stylesheet href="weasyprint-custom:foo/bar.css"><body>')

    with capture_logs() as logs:
        test('<body><img src="custom:foo/bar">', blank=True)
    assert len(logs) == 1
    assert logs[0].startswith(
        "ERROR: Failed to load image at 'custom:foo/bar'")

    with capture_logs() as logs:
        test(
            '<link rel=stylesheet href="weasyprint-custom:foo/bar.css">'
            '<link rel=stylesheet href="weasyprint-custom:foo/bar.no"><body>')
    assert len(logs) == 1
    assert logs[0].startswith('ERROR: Unsupported stylesheet type text/no')

    def fetcher_2(url):
        assert url == 'weasyprint-custom:%C3%A9_%e9.css'
        return {'string': '', 'mime_type': 'text/css'}
    FakeHTML(
        string='<link rel=stylesheet href="weasyprint-custom:é_%e9.css"><body',
        url_fetcher=fetcher_2).render()


@assert_no_logs
def test_html_meta():
    def assert_meta(html, **meta):
        meta.setdefault('title', None)
        meta.setdefault('authors', [])
        meta.setdefault('keywords', [])
        meta.setdefault('generator', None)
        meta.setdefault('description', None)
        meta.setdefault('created', None)
        meta.setdefault('modified', None)
        meta.setdefault('attachments', [])
        assert vars(FakeHTML(string=html).render().metadata) == meta

    assert_meta('<body>')
    assert_meta(
        '''
            <meta name=author content="I Me &amp; Myself">
            <meta name=author content="Smith, John">
            <title>Test document</title>
            <h1>Another title</h1>
            <meta name=generator content="Human after all">
            <meta name=dummy content=ignored>
            <meta name=dummy>
            <meta content=ignored>
            <meta>
            <meta name=keywords content="html ,\tcss,
                                         pdf,css">
            <meta name=dcterms.created content=2011-04>
            <meta name=dcterms.created content=2011-05>
            <meta name=dcterms.modified content=2013>
            <meta name=keywords content="Python; pydyf">
            <meta name=description content="Blah… ">
        ''',
        authors=['I Me & Myself', 'Smith, John'],
        title='Test document',
        generator='Human after all',
        keywords=['html', 'css', 'pdf', 'Python; pydyf'],
        description="Blah… ",
        created='2011-04',
        modified='2013')
    assert_meta(
        '''
            <title>One</title>
            <meta name=Author>
            <title>Two</title>
            <title>Three</title>
            <meta name=author content=Me>
        ''',
        title='One',
        authors=['', 'Me'])


@assert_no_logs
def test_http():
    def gzip_compress(data):
        file_obj = io.BytesIO()
        gzip_file = gzip.GzipFile(fileobj=file_obj, mode='wb')
        gzip_file.write(data)
        gzip_file.close()
        return file_obj.getvalue()

    with http_server({
        '/gzip': lambda env: (
            (gzip_compress(b'<html test=ok>'), [('Content-Encoding', 'gzip')])
            if 'gzip' in env.get('HTTP_ACCEPT_ENCODING', '') else
            (b'<html test=accept-encoding-header-fail>', [])
        ),
        '/deflate': lambda env: (
            (zlib.compress(b'<html test=ok>'),
             [('Content-Encoding', 'deflate')])
            if 'deflate' in env.get('HTTP_ACCEPT_ENCODING', '') else
            (b'<html test=accept-encoding-header-fail>', [])
        ),
        '/raw-deflate': lambda env: (
            # Remove zlib header and checksum
            (zlib.compress(b'<html test=ok>')[2:-4],
             [('Content-Encoding', 'deflate')])
            if 'deflate' in env.get('HTTP_ACCEPT_ENCODING', '') else
            (b'<html test=accept-encoding-header-fail>', [])
        ),
    }) as root_url:
        assert HTML(root_url + '/gzip').etree_element.get('test') == 'ok'
        assert HTML(root_url + '/deflate').etree_element.get('test') == 'ok'
        assert HTML(
            root_url + '/raw-deflate').etree_element.get('test') == 'ok'