import unittest

from django.contrib.admindocs.utils import (
    docutils_is_available, parse_docstring, parse_rst,
)
from django.test.utils import captured_stderr

from .tests import AdminDocsSimpleTestCase


@unittest.skipUnless(docutils_is_available, "no docutils installed.")
class TestUtils(AdminDocsSimpleTestCase):
    """
    This __doc__ output is required for testing. I copied this example from
    `admindocs` documentation. (TITLE)

    Display an individual :model:`myapp.MyModel`.

    **Context**

    ``RequestContext``

    ``mymodel``
        An instance of :model:`myapp.MyModel`.

    **Template:**

    :template:`myapp/my_template.html` (DESCRIPTION)

    some_metadata: some data
    """
    def setUp(self):
        self.docstring = self.__doc__

    def test_parse_docstring(self):
        title, description, metadata = parse_docstring(self.docstring)
        docstring_title = (
            'This __doc__ output is required for testing. I copied this example from\n'
            '`admindocs` documentation. (TITLE)'
        )
        docstring_description = (
            'Display an individual :model:`myapp.MyModel`.\n\n'
            '**Context**\n\n``RequestContext``\n\n``mymodel``\n'
            '    An instance of :model:`myapp.MyModel`.\n\n'
            '**Template:**\n\n:template:`myapp/my_template.html` '
            '(DESCRIPTION)'
        )
        self.assertEqual(title, docstring_title)
        self.assertEqual(description, docstring_description)
        self.assertEqual(metadata, {'some_metadata': 'some data'})

    def test_title_output(self):
        title, description, metadata = parse_docstring(self.docstring)
        title_output = parse_rst(title, 'model', 'model:admindocs')
        self.assertIn('TITLE', title_output)
        title_rendered = (
            '<p>This __doc__ output is required for testing. I copied this '
            'example from\n<a class="reference external" '
            'href="/admindocs/models/admindocs/">admindocs</a> documentation. '
            '(TITLE)</p>\n'
        )
        self.assertHTMLEqual(title_output, title_rendered)

    def test_description_output(self):
        title, description, metadata = parse_docstring(self.docstring)
        description_output = parse_rst(description, 'model', 'model:admindocs')
        description_rendered = (
            '<p>Display an individual <a class="reference external" '
            'href="/admindocs/models/myapp.mymodel/">myapp.MyModel</a>.</p>\n'
            '<p><strong>Context</strong></p>\n<p><tt class="docutils literal">'
            'RequestContext</tt></p>\n<dl class="docutils">\n<dt><tt class="'
            'docutils literal">mymodel</tt></dt>\n<dd>An instance of <a class="'
            'reference external" href="/admindocs/models/myapp.mymodel/">'
            'myapp.MyModel</a>.</dd>\n</dl>\n<p><strong>Template:</strong></p>'
            '\n<p><a class="reference external" href="/admindocs/templates/'
            'myapp/my_template.html/">myapp/my_template.html</a> (DESCRIPTION)'
            '</p>\n'
        )
        self.assertHTMLEqual(description_output, description_rendered)

    def test_initial_header_level(self):
        header = 'should be h3...\n\nHeader\n------\n'
        output = parse_rst(header, 'header')
        self.assertIn('<h3>Header</h3>', output)

    def test_parse_rst(self):
        """
        parse_rst() should use `cmsreference` as the default role.
        """
        markup = '<p><a class="reference external" href="/admindocs/%s">title</a></p>\n'
        self.assertEqual(parse_rst('`title`', 'model'), markup % 'models/title/')
        self.assertEqual(parse_rst('`title`', 'view'), markup % 'views/title/')
        self.assertEqual(parse_rst('`title`', 'template'), markup % 'templates/title/')
        self.assertEqual(parse_rst('`title`', 'filter'), markup % 'filters/#title')
        self.assertEqual(parse_rst('`title`', 'tag'), markup % 'tags/#title')

    def test_parse_rst_with_docstring_no_leading_line_feed(self):
        title, body, _ = parse_docstring('firstline\n\n    second line')
        with captured_stderr() as stderr:
            self.assertEqual(parse_rst(title, ''), '<p>firstline</p>\n')
            self.assertEqual(parse_rst(body, ''), '<p>second line</p>\n')
        self.assertEqual(stderr.getvalue(), '')

    def test_publish_parts(self):
        """
        Django shouldn't break the default role for interpreted text
        when ``publish_parts`` is used directly, by setting it to
        ``cmsreference`` (#6681).
        """
        import docutils
        self.assertNotEqual(docutils.parsers.rst.roles.DEFAULT_INTERPRETED_ROLE, 'cmsreference')
        source = 'reST, `interpreted text`, default role.'
        markup = '<p>reST, <cite>interpreted text</cite>, default role.</p>\n'
        parts = docutils.core.publish_parts(source=source, writer_name="html4css1")
        self.assertEqual(parts['fragment'], markup)