"""Tests for the backlinks module."""

from __future__ import annotations

from textwrap import dedent

from markdown import Markdown

from mkdocs_autorefs import AUTOREF_RE, AutorefsExtension, AutorefsPlugin, Backlink, BacklinkCrumb
from mkdocs_autorefs._internal.references import _html_attrs_parser
from tests.helpers import create_page


def test_record_backlinks() -> None:
    """Check that only useful backlinks are recorded."""
    plugin = AutorefsPlugin()
    plugin._record_backlink("foo", "referenced-by", "foo", "foo.html")
    assert "foo" not in plugin._backlinks

    plugin.register_anchor(identifier="foo", page=create_page("foo.html"), primary=True)
    plugin._record_backlink("foo", "referenced-by", "foo", "foo.html")
    assert "foo" in plugin._backlinks


def test_get_backlinks() -> None:
    """Check that backlinks can be retrieved."""
    plugin = AutorefsPlugin()
    plugin.record_backlinks = True
    plugin.register_anchor(identifier="foo", page=create_page("foo.html"), primary=True)
    plugin._record_backlink("foo", "referenced-by", "foo", "foo.html")
    assert plugin.get_backlinks("foo", from_url="") == {
        "referenced-by": {
            Backlink(
                crumbs=(
                    BacklinkCrumb(title="foo.html", url="foo.html#"),
                    BacklinkCrumb(title="", url="foo.html#foo"),
                ),
            ),
        },
    }


def test_backlinks_treeprocessor() -> None:
    """Check that the backlinks treeprocessor works."""
    plugin = AutorefsPlugin()
    plugin.record_backlinks = True
    plugin.current_page = create_page("foo.html")
    md = Markdown(extensions=["attr_list", "toc", AutorefsExtension(plugin)])
    html = md.convert(
        dedent(
            """
            [](){#alias}
            ## Heading

            [Foo][foo]
            """,
        ),
    )
    match = AUTOREF_RE.search(html)
    assert match
    attrs = _html_attrs_parser.parse(f"<a {match['attrs']}>")
    assert "backlink-type" in attrs
    assert "backlink-anchor" in attrs
