#!/usr/bin/env python3
#
#  generic_bases.py
r"""
Modifies :class:`sphinx.ext.autodoc.ClassDocumenter`\'s ``:show-inheritence:`` option
to show generic base classes.

This requires a relatively new version of the :mod:`typing` module that implements ``__orig_bases__``.

.. versionadded:: 1.5.0
.. extensions:: sphinx_toolbox.more_autodoc.generic_bases


Configuration
----------------

.. confval:: generic_bases_fully_qualified
	:type: :class:`bool`
	:required: False
	:default: :py:obj:`False`

	Determines whether the fully qualified name should be shown for bases.

	If :py:obj:`False` (the default):

		.. class:: Foo
			:noindex:

			**Bases**: :class:`~typing.List`\[:class:`str`\]

	If :py:obj:`True`:

		.. class:: Foo
			:noindex:

			**Bases**: :class:`typing.List`\[:class:`str`\]

	Corresponds to the ``fully_qualified`` argument to
	:func:`sphinx_toolbox.more_autodoc.typehints.format_annotation`.

	.. versionadded:: 2.13.0

Example
--------

.. autoclass:: sphinx_toolbox.more_autodoc.generic_bases.Example


API Reference
-----------------
"""  # noqa: D400
#
#  Copyright © 2020-2021 Dominic Davis-Foster <dominic@davis-foster.co.uk>
#
#  Permission is hereby granted, free of charge, to any person obtaining a copy
#  of this software and associated documentation files (the "Software"), to deal
#  in the Software without restriction, including without limitation the rights
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#  copies of the Software, and to permit persons to whom the Software is
#  furnished to do so, subject to the following conditions:
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#  The above copyright notice and this permission notice shall be included in all
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#  OR OTHER DEALINGS IN THE SOFTWARE.
#

# stdlib
import sys
from typing import List, Tuple

# 3rd party
from sphinx.application import Sphinx
from sphinx.ext.autodoc import Documenter
from sphinx.locale import _
from typing_extensions import final

# this package
from sphinx_toolbox.more_autodoc.typehints import format_annotation
from sphinx_toolbox.more_autosummary import PatchedAutoSummClassDocumenter
from sphinx_toolbox.utils import SphinxExtMetadata, allow_subclass_add, metadata_add_version

if sys.version_info >= (3, 8):  # pragma: no cover (<py38)
	# stdlib
	from typing import get_origin
else:  # pragma: no cover (py38+)
	# 3rd party
	from typing_inspect import get_origin

__all__ = ("GenericBasesClassDocumenter", "setup")


class GenericBasesClassDocumenter(PatchedAutoSummClassDocumenter):
	"""
	Class documenter that adds inheritance info, with support for generics.
	"""

	def add_directive_header(self, sig: str) -> None:
		"""
		Add the directive header.

		:param sig:
		"""

		sourcename = self.get_sourcename()

		if self.doc_as_attr:
			self.directivetype = "attribute"

		Documenter.add_directive_header(self, sig)

		if self.analyzer and '.'.join(self.objpath) in self.analyzer.finals:
			self.add_line("   :final:", sourcename)

		# add inheritance info, if wanted
		if not self.doc_as_attr and self.options.show_inheritance:
			_add_generic_bases(self)


def _add_generic_bases(documenter: Documenter) -> None:
	"""
	Add the generic bases to the output of the given Documenter.

	.. versionadded:: 2.13.0  (undocumented)

	:param documenter:
	"""

	sourcename = documenter.get_sourcename()

	# add inheritance info, if wanted
	fully_qualified = getattr(documenter.env.config, "generic_bases_fully_qualified", False)

	documenter.add_line('', sourcename)
	bases = []  # pylint: disable=W8301

	if (
			hasattr(documenter.object, "__orig_bases__") and len(documenter.object.__orig_bases__)
			and get_origin(documenter.object.__orig_bases__[0]) is documenter.object.__bases__[0]
			):
		# Last condition guards against classes that don't directly subclass a Generic.
		bases = [format_annotation(b, fully_qualified) for b in documenter.object.__orig_bases__]

	elif hasattr(documenter.object, "__bases__") and len(documenter.object.__bases__):
		bases = [format_annotation(b, fully_qualified) for b in documenter.object.__bases__]

	if bases:
		bases_string = ", ".join(bases).replace("typing_extensions.", "typing.")
		documenter.add_line("   " + _("Bases: %s") % bases_string, sourcename)


@metadata_add_version
def setup(app: Sphinx) -> SphinxExtMetadata:
	"""
	Setup :mod:`sphinx_toolbox.more_autodoc.generic_bases`.

	.. versionadded:: 1.5.0

	:param app: The Sphinx application.
	"""

	allow_subclass_add(app, GenericBasesClassDocumenter)
	app.add_config_value(
			"generic_bases_fully_qualified",
			default=False,
			rebuild="env",
			types=[bool],
			)

	return {"parallel_read_safe": True}


class Example(List[Tuple[str, float, List[str]]]):
	"""
	An example of :mod:`sphinx_toolbox.more_autodoc.generic_bases`.
	"""

	def __init__(self, iterable=()):  # pragma: no cover  # noqa: MAN001
		pass


class Example2(Example):
	"""
	An example of :mod:`sphinx_toolbox.more_autodoc.generic_bases`.

	This one does not directly subclass a Generic.
	"""


@final
class FinalExample(List[Tuple[str, float, List[str]]]):
	"""
	An example of :mod:`sphinx_toolbox.more_autodoc.generic_bases` decorated with ``@final``.
	"""

	def __init__(self, iterable=()):  # pragma: no cover  # noqa: MAN001
		pass