"""Test sphinx.ext.inheritance_diagram extension."""

import os
import re
import sys
import zlib

import pytest

from sphinx.ext.inheritance_diagram import (
    InheritanceDiagram,
    InheritanceException,
    import_classes,
)
from sphinx.ext.intersphinx import load_mappings, normalize_intersphinx_mapping


@pytest.mark.sphinx(buildername="html", testroot="inheritance")
@pytest.mark.usefixtures('if_graphviz_found')
def test_inheritance_diagram(app, status, warning):
    # monkey-patch InheritaceDiagram.run() so we can get access to its
    # results.
    orig_run = InheritanceDiagram.run
    graphs = {}

    def new_run(self):
        result = orig_run(self)
        node = result[0]
        source = os.path.basename(node.document.current_source).replace(".rst", "")
        graphs[source] = node['graph']
        return result

    InheritanceDiagram.run = new_run

    try:
        app.build(force_all=True)
    finally:
        InheritanceDiagram.run = orig_run

    assert app.statuscode == 0

    html_warnings = warning.getvalue()
    assert html_warnings == ""

    # note: it is better to split these asserts into separate test functions
    # but I can't figure out how to build only a specific .rst file

    # basic inheritance diagram showing all classes
    for cls in graphs['basic_diagram'].class_info:
        # use in b/c traversing order is different sometimes
        assert cls in [
            ('dummy.test.A', 'dummy.test.A', [], None),
            ('dummy.test.F', 'dummy.test.F', ['dummy.test.C'], None),
            ('dummy.test.C', 'dummy.test.C', ['dummy.test.A'], None),
            ('dummy.test.E', 'dummy.test.E', ['dummy.test.B'], None),
            ('dummy.test.D', 'dummy.test.D', ['dummy.test.B', 'dummy.test.C'], None),
            ('dummy.test.B', 'dummy.test.B', ['dummy.test.A'], None),
        ]

    # inheritance diagram using :parts: 1 option
    for cls in graphs['diagram_w_parts'].class_info:
        assert cls in [
            ('A', 'dummy.test.A', [], None),
            ('F', 'dummy.test.F', ['C'], None),
            ('C', 'dummy.test.C', ['A'], None),
            ('E', 'dummy.test.E', ['B'], None),
            ('D', 'dummy.test.D', ['B', 'C'], None),
            ('B', 'dummy.test.B', ['A'], None),
        ]

    # inheritance diagram with 1 top class
    # :top-classes: dummy.test.B
    # rendering should be
    #       A
    #        \
    #     B   C
    #    / \ / \
    #   E   D   F
    #
    for cls in graphs['diagram_w_1_top_class'].class_info:
        assert cls in [
            ('dummy.test.A', 'dummy.test.A', [], None),
            ('dummy.test.F', 'dummy.test.F', ['dummy.test.C'], None),
            ('dummy.test.C', 'dummy.test.C', ['dummy.test.A'], None),
            ('dummy.test.E', 'dummy.test.E', ['dummy.test.B'], None),
            ('dummy.test.D', 'dummy.test.D', ['dummy.test.B', 'dummy.test.C'], None),
            ('dummy.test.B', 'dummy.test.B', [], None),
        ]

    # inheritance diagram with 2 top classes
    # :top-classes: dummy.test.B, dummy.test.C
    # Note: we're specifying separate classes, not the entire module here
    # rendering should be
    #
    #     B   C
    #    / \ / \
    #   E   D   F
    #
    for cls in graphs['diagram_w_2_top_classes'].class_info:
        assert cls in [
            ('dummy.test.F', 'dummy.test.F', ['dummy.test.C'], None),
            ('dummy.test.C', 'dummy.test.C', [], None),
            ('dummy.test.E', 'dummy.test.E', ['dummy.test.B'], None),
            ('dummy.test.D', 'dummy.test.D', ['dummy.test.B', 'dummy.test.C'], None),
            ('dummy.test.B', 'dummy.test.B', [], None),
        ]

    # inheritance diagram with 2 top classes and specifying the entire module
    # rendering should be
    #
    #       A
    #     B   C
    #    / \ / \
    #   E   D   F
    #
    # Note: dummy.test.A is included in the graph before its descendants are even processed
    # b/c we've specified to load the entire module. The way InheritanceGraph works it is very
    # hard to exclude parent classes once after they have been included in the graph.
    # If you'd like to not show class A in the graph don't specify the entire module.
    # this is a known issue.
    for cls in graphs['diagram_module_w_2_top_classes'].class_info:
        assert cls in [
            ('dummy.test.F', 'dummy.test.F', ['dummy.test.C'], None),
            ('dummy.test.C', 'dummy.test.C', [], None),
            ('dummy.test.E', 'dummy.test.E', ['dummy.test.B'], None),
            ('dummy.test.D', 'dummy.test.D', ['dummy.test.B', 'dummy.test.C'], None),
            ('dummy.test.B', 'dummy.test.B', [], None),
            ('dummy.test.A', 'dummy.test.A', [], None),
        ]

    # inheritance diagram involving a base class nested within another class
    for cls in graphs['diagram_w_nested_classes'].class_info:
        assert cls in [
            ('dummy.test_nested.A', 'dummy.test_nested.A', [], None),
            ('dummy.test_nested.C', 'dummy.test_nested.C', ['dummy.test_nested.A.B'], None),
            ('dummy.test_nested.A.B', 'dummy.test_nested.A.B', [], None),
        ]


# An external inventory to test intersphinx links in inheritance diagrams
external_inventory = b'''\
# Sphinx inventory version 2
# Project: external
# Version: 1.0
# The remainder of this file is compressed using zlib.
''' + zlib.compress(b'''\
external.other.Bob py:class 1 foo.html#external.other.Bob -
''')


@pytest.mark.sphinx('html', testroot='ext-inheritance_diagram')
@pytest.mark.usefixtures('if_graphviz_found')
def test_inheritance_diagram_png_html(tmp_path, app):
    inv_file = tmp_path / 'inventory'
    inv_file.write_bytes(external_inventory)
    app.config.intersphinx_mapping = {
        'https://example.org': str(inv_file),
    }
    app.config.intersphinx_cache_limit = 0
    normalize_intersphinx_mapping(app, app.config)
    load_mappings(app)

    app.build(force_all=True)

    content = (app.outdir / 'index.html').read_text(encoding='utf8')
    base_maps = re.findall('<map .+\n.+\n</map>', content)

    pattern = ('<figure class="align-default" id="id1">\n'
               '<div class="graphviz">'
               '<img src="_images/inheritance-\\w+.png" alt="Inheritance diagram of test.Foo" '
               'class="inheritance graphviz" /></div>\n<figcaption>\n<p>'
               '<span class="caption-text">Test Foo!</span><a class="headerlink" href="#id1" '
               'title="Link to this image">\xb6</a></p>\n</figcaption>\n</figure>\n')
    assert re.search(pattern, content, re.MULTILINE)

    subdir_content = (app.outdir / 'subdir/page1.html').read_text(encoding='utf8')
    subdir_maps = re.findall('<map .+\n.+\n</map>', subdir_content)
    subdir_maps = [re.sub('href="(\\S+)"', 'href="subdir/\\g<1>"', s) for s in subdir_maps]

    # Go through the clickmap for every PNG inheritance diagram
    for diagram_content in base_maps + subdir_maps:
        # Verify that an intersphinx link was created via the external inventory
        if 'subdir.' in diagram_content:
            assert "https://example.org" in diagram_content

        # Extract every link in the inheritance diagram
        for href in re.findall('href="(\\S+?)"', diagram_content):
            if '://' in href:
                # Verify that absolute URLs are not prefixed with ../
                assert href.startswith("https://example.org/")
            else:
                # Verify that relative URLs point to existing documents
                reluri = href.rsplit('#', 1)[0]  # strip the anchor at the end
                assert (app.outdir / reluri).exists()


@pytest.mark.sphinx('html', testroot='ext-inheritance_diagram',
                    confoverrides={'graphviz_output_format': 'svg'})
@pytest.mark.usefixtures('if_graphviz_found')
def test_inheritance_diagram_svg_html(tmp_path, app):
    inv_file = tmp_path / 'inventory'
    inv_file.write_bytes(external_inventory)
    app.config.intersphinx_mapping = {
        "subdir": ('https://example.org', str(inv_file)),
    }
    app.config.intersphinx_cache_limit = 0
    normalize_intersphinx_mapping(app, app.config)
    load_mappings(app)

    app.build(force_all=True)

    content = (app.outdir / 'index.html').read_text(encoding='utf8')
    base_svgs = re.findall('<object data="(_images/inheritance-\\w+.svg?)"', content)

    pattern = ('<figure class="align-default" id="id1">\n'
               '<div class="graphviz">'
               '<object data="_images/inheritance-\\w+.svg" '
               'type="image/svg\\+xml" class="inheritance graphviz">\n'
               '<p class="warning">Inheritance diagram of test.Foo</p>'
               '</object></div>\n<figcaption>\n<p><span class="caption-text">'
               'Test Foo!</span><a class="headerlink" href="#id1" '
               'title="Link to this image">\xb6</a></p>\n</figcaption>\n</figure>\n')

    assert re.search(pattern, content, re.MULTILINE)

    subdir_content = (app.outdir / 'subdir/page1.html').read_text(encoding='utf8')
    subdir_svgs = re.findall('<object data="../(_images/inheritance-\\w+.svg?)"', subdir_content)

    # Go through every SVG inheritance diagram
    for diagram in base_svgs + subdir_svgs:
        diagram_content = (app.outdir / diagram).read_text(encoding='utf8')

        # Verify that an intersphinx link was created via the external inventory
        if 'subdir.' in diagram_content:
            assert "https://example.org" in diagram_content

        # Extract every link in the inheritance diagram
        for href in re.findall('href="(\\S+?)"', diagram_content):
            if '://' in href:
                # Verify that absolute URLs are not prefixed with ../
                assert href.startswith("https://example.org/")
            else:
                # Verify that relative URLs point to existing documents
                reluri = href.rsplit('#', 1)[0]  # strip the anchor at the end
                abs_uri = (app.outdir / app.builder.imagedir / reluri).resolve()
                assert abs_uri.exists()


@pytest.mark.sphinx('latex', testroot='ext-inheritance_diagram')
@pytest.mark.usefixtures('if_graphviz_found')
def test_inheritance_diagram_latex(app, status, warning):
    app.build(force_all=True)

    content = (app.outdir / 'python.tex').read_text(encoding='utf8')

    pattern = ('\\\\begin{figure}\\[htbp]\n\\\\centering\n\\\\capstart\n\n'
               '\\\\sphinxincludegraphics\\[\\]{inheritance-\\w+.pdf}\n'
               '\\\\caption{Test Foo!}\\\\label{\\\\detokenize{index:id1}}\\\\end{figure}')
    assert re.search(pattern, content, re.MULTILINE)


@pytest.mark.sphinx('html', testroot='ext-inheritance_diagram',
                    srcdir='ext-inheritance_diagram-alias')
@pytest.mark.usefixtures('if_graphviz_found')
def test_inheritance_diagram_latex_alias(app, status, warning):
    app.config.inheritance_alias = {'test.Foo': 'alias.Foo'}
    app.build(force_all=True)

    doc = app.env.get_and_resolve_doctree('index', app)
    aliased_graph = doc.children[0].children[3]['graph'].class_info
    assert len(aliased_graph) == 4
    assert ('test.DocSubDir2', 'test.DocSubDir2', ['test.DocSubDir1'], None) in aliased_graph
    assert ('test.DocSubDir1', 'test.DocSubDir1', ['test.DocHere'], None) in aliased_graph
    assert ('test.DocHere', 'test.DocHere', ['alias.Foo'], None) in aliased_graph
    assert ('alias.Foo', 'alias.Foo', [], None) in aliased_graph

    content = (app.outdir / 'index.html').read_text(encoding='utf8')

    pattern = ('<figure class="align-default" id="id1">\n'
               '<div class="graphviz">'
               '<img src="_images/inheritance-\\w+.png" alt="Inheritance diagram of test.Foo" '
               'class="inheritance graphviz" /></div>\n<figcaption>\n<p>'
               '<span class="caption-text">Test Foo!</span><a class="headerlink" href="#id1" '
               'title="Link to this image">\xb6</a></p>\n</figcaption>\n</figure>\n')
    assert re.search(pattern, content, re.MULTILINE)


def test_import_classes(rootdir):
    from sphinx.parsers import Parser, RSTParser
    from sphinx.util.i18n import CatalogInfo

    try:
        sys.path.append(str(rootdir / 'test-ext-inheritance_diagram'))
        from example.sphinx import DummyClass

        # got exception for unknown class or module
        with pytest.raises(InheritanceException):
            import_classes('unknown', None)
        with pytest.raises(InheritanceException):
            import_classes('unknown.Unknown', None)

        # got exception InheritanceException for wrong class or module
        # not AttributeError (refs: #4019)
        with pytest.raises(InheritanceException):
            import_classes('unknown', '.')
        with pytest.raises(InheritanceException):
            import_classes('unknown.Unknown', '.')
        with pytest.raises(InheritanceException):
            import_classes('.', None)

        # a module having no classes
        classes = import_classes('sphinx', None)
        assert classes == []

        classes = import_classes('sphinx', 'foo')
        assert classes == []

        # all of classes in the module
        classes = import_classes('sphinx.parsers', None)
        assert set(classes) == {Parser, RSTParser}

        # specified class in the module
        classes = import_classes('sphinx.parsers.Parser', None)
        assert classes == [Parser]

        # specified class in current module
        classes = import_classes('Parser', 'sphinx.parsers')
        assert classes == [Parser]

        # relative module name to current module
        classes = import_classes('i18n.CatalogInfo', 'sphinx.util')
        assert classes == [CatalogInfo]

        # got exception for functions
        with pytest.raises(InheritanceException):
            import_classes('encode_uri', 'sphinx.util')

        # import submodule on current module (refs: #3164)
        classes = import_classes('sphinx', 'example')
        assert classes == [DummyClass]
    finally:
        sys.path.pop()
