# -*- coding: utf-8 -*-
#
# Configuration file for the Sphinx documentation builder.
#
# This file does only contain a selection of the most common options. For a
# full list see the documentation:
# http://www.sphinx-doc.org/en/stable/config

# -- Path setup --------------------------------------------------------------

# If extensions (or modules to document with autodoc) are in another directory,
# add these directories to sys.path here. If the directory is relative to the
# documentation root, use os.path.abspath to make it absolute, like shown here.
#
import os
import shutil
import sys

sys.path.insert(0, os.path.abspath("../.."))
from datetime import datetime

import pytorch_sphinx_theme

import ignite

# -- Project information -----------------------------------------------------

project = "PyTorch-Ignite"
author = "PyTorch-Ignite Contributors"
copyright = f"{datetime.now().year}, {author}"

# The short X.Y version
try:
    version = os.environ["code_version"]
except KeyError:
    version = ignite.__version__

# The full version, including alpha/beta/rc tags
release = version


# -- General configuration ---------------------------------------------------

# If your documentation needs a minimal Sphinx version, state it here.
#
# needs_sphinx = '1.0'

# Add any Sphinx extension module names here, as strings. They can be
# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
# ones.
extensions = [
    "sphinx.ext.autodoc",
    "sphinx.ext.autosummary",
    "sphinx.ext.doctest",
    "sphinx.ext.intersphinx",
    "sphinx.ext.todo",
    "sphinx.ext.coverage",
    "sphinxcontrib.katex",
    "sphinx.ext.napoleon",
    "sphinx.ext.viewcode",
    "sphinx.ext.autosectionlabel",
    "sphinx_copybutton",
    "sphinx_togglebutton",
]

# toggle button hint text
togglebutton_hint = "Show default setup"
togglebutton_hint_hide = "Hide default setup"

# Copy defaults.rst to source/generated to be discoverable in docstrings
# Skip this step for previous versions of ignite
if os.path.exists("defaults.rst"):
    src_folder = os.path.dirname(__file__)
    gen_folder = os.path.join(src_folder, "generated")
    os.makedirs(gen_folder, exist_ok=True)
    shutil.copy(os.path.join(src_folder, "defaults.rst"), gen_folder)

# katex options
katex_prerender = True

# Add any paths that contain templates here, relative to this directory.
templates_path = ["_templates"]

# The suffix(es) of source filenames.
# You can specify multiple suffix as a list of string:
#
# source_suffix = ['.rst', '.md']
source_suffix = ".rst"

# The master toctree document.
master_doc = "index"

# The language for content autogenerated by Sphinx. Refer to documentation
# for a list of supported languages.
#
# This is also used if you do content translation via gettext catalogs.
# Usually you set "language" from the command line for these cases.
language = "en"

# List of patterns, relative to source directory, that match files and
# directories to ignore when looking for source files.
# This pattern also affects html_static_path and html_extra_path .
exclude_patterns = []

# The name of the Pygments (syntax highlighting) style to use.
pygments_style = "sphinx"


# -- Options for HTML output -------------------------------------------------

# The theme to use for HTML and HTML Help pages.  See the documentation for
# a list of builtin themes.

html_title = f"{project} {version} Documentation"
html_theme = "pytorch_sphinx_theme"
html_theme_path = [pytorch_sphinx_theme.get_html_theme_path()]

html_theme_options = {
    "canonical_url": "https://pytorch.org/ignite/",
    "collapse_navigation": False,
    "display_version": True,
    "logo_only": True,
    "navigation_with_keys": True,
}

html_logo = "_templates/_static/img/ignite_logo.svg"

html_favicon = "_templates/_static/img/ignite_logomark.svg"

# Theme options are theme-specific and customize the look and feel of a theme
# further.  For a list of options available for each theme, see the
# documentation.
#
# html_theme_options = {}

# Add any paths that contain custom static files (such as style sheets) here,
# relative to this directory. They are copied after the builtin static files,
# so a file named "default.css" will overwrite the builtin "default.css".
html_static_path = ["_static", "_templates/_static"]

html_context = {
    "extra_css_files": [
        # 'https://fonts.googleapis.com/css?family=Lato',
        # '_static/css/pytorch_theme.css'
        "_static/css/ignite_theme.css",
        "https://cdn.jsdelivr.net/npm/@docsearch/css@1.0.0-alpha.28/dist/style.min.css",
    ],
}

html_last_updated_fmt = "%m/%d/%Y, %X"
html_permalinks = True
html_permalinks_icon = "#"

# -- Options for HTMLHelp output ---------------------------------------------

# Output file base name for HTML help builder.
htmlhelp_basename = "ignitedoc"


# -- Options for LaTeX output ------------------------------------------------

latex_elements = {
    # The paper size ('letterpaper' or 'a4paper').
    #
    # 'papersize': 'letterpaper',
    # The font size ('10pt', '11pt' or '12pt').
    #
    # 'pointsize': '10pt',
    # Additional stuff for the LaTeX preamble.
    #
    # 'preamble': '',
    # Latex figure (float) alignment
    #
    # 'figure_align': 'htbp',
}

# Grouping the document tree into LaTeX files. List of tuples
# (source start file, target name, title,
#  author, documentclass [howto, manual, or own class]).
latex_documents = [
    (master_doc, "ignite.tex", "ignite Documentation", "Torch Contributors", "manual"),
]


# -- Options for manual page output ------------------------------------------

# One entry per manual page. List of tuples
# (source start file, name, description, authors, manual section).
man_pages = [(master_doc, "ignite", "ignite Documentation", [author], 1)]


# -- Options for Texinfo output ----------------------------------------------

# Grouping the document tree into Texinfo files. List of tuples
# (source start file, target name, title, author,
#  dir menu entry, description, category)
texinfo_documents = [
    (
        master_doc,
        "ignite",
        "ignite Documentation",
        author,
        "ignite",
        "One line description of project.",
        "Miscellaneous",
    ),
]


# -- Extension configuration -------------------------------------------------

# -- Options for intersphinx extension ---------------------------------------

# Example configuration for intersphinx: refer to the Python standard library.
intersphinx_mapping = {
    "python": ("https://docs.python.org/3", None),
    "torch": ("https://pytorch.org/docs/stable/", None),
}

# -- Options for todo extension ----------------------------------------------

# If true, `todo` and `todoList` produce output, else they produce nothing.
todo_include_todos = True

# -- Type hints configs ------------------------------------------------------

autodoc_inherit_docstrings = True
autoclass_content = "both"
autodoc_typehints = "description"
napoleon_attr_annotations = True

# -- Autosummary patch to get list of a classes, funcs automatically ----------

from importlib import import_module
from inspect import getmembers, isclass, isfunction

from docutils.parsers.rst import directives
from docutils.statemachine import StringList
from sphinx.ext.autosummary import Autosummary


class AutolistAutosummary(Autosummary):
    """Autosummary with autolisting for modules.

    By default it tries to import all public names (__all__),
    otherwise import all classes and/or functions in a module.

    Options:
    - :autolist: option to get list of classes and functions from currentmodule.
    - :autolist-classes: option to get list of classes from currentmodule.
    - :autolist-functions: option to get list of functions from currentmodule.

    Example Usage:

    .. currentmodule:: ignite.metrics

    .. autosummary::
        :nosignatures:
        :autolist:
    """

    # Add new option
    _option_spec = Autosummary.option_spec.copy()
    _option_spec.update(
        {
            "autolist": directives.unchanged,
            "autolist-classes": directives.unchanged,
            "autolist-functions": directives.unchanged,
        }
    )
    option_spec = _option_spec

    def run(self):
        for auto in ("autolist", "autolist-classes", "autolist-functions"):
            if auto in self.options:
                # Get current module name
                module_name = self.env.ref_context.get("py:module")
                # Import module
                module = import_module(module_name)

                # Get public names (if possible)
                try:
                    names = getattr(module, "__all__")
                except AttributeError:
                    # Get classes defined in the module
                    cls_names = [
                        name[0]
                        for name in getmembers(module, isclass)
                        if name[-1].__module__ == module_name and not (name[0].startswith("_"))
                    ]
                    # Get functions defined in the module
                    fn_names = [
                        name[0]
                        for name in getmembers(module, isfunction)
                        if (name[-1].__module__ == module_name) and not (name[0].startswith("_"))
                    ]
                    names = cls_names + fn_names
                    # It may happen that module doesn't have any defined class or func
                    if not names:
                        names = [name[0] for name in getmembers(module)]

                # Filter out members w/o doc strings
                names = [name for name in names if getattr(module, name).__doc__ is not None]

                if auto == "autolist":
                    # Get list of all classes and functions inside module
                    names = [
                        name for name in names if (isclass(getattr(module, name)) or isfunction(getattr(module, name)))
                    ]
                else:
                    if auto == "autolist-classes":
                        # Get only classes
                        check = isclass
                    elif auto == "autolist-functions":
                        # Get only functions
                        check = isfunction
                    else:
                        raise NotImplementedError

                    names = [name for name in names if check(getattr(module, name))]

                # Update content
                self.content = StringList(names)
        return super().run()


# --- autosummary config -----------------------------------------------------
autosummary_generate = True

# --- nitpicky config : check internal links are correct or not --------------
nitpicky = True
# ignore links which can't be referenced
nitpick_ignore = [
    ("py:class", ".."),
    ("py:class", "TextIO"),
    ("py:class", "torch.device"),
    ("py:class", "_MpDeviceLoader"),
    ("py:class", "torch.nn.modules.module.Module"),
    ("py:class", "torch.optim.optimizer.Optimizer"),
    ("py:class", "torch.utils.data.dataset.Dataset"),
    ("py:class", "torch.utils.data.sampler.BatchSampler"),
    ("py:class", "torch.cuda.amp.grad_scaler.GradScaler"),
    ("py:class", "torch.optim.lr_scheduler._LRScheduler"),
    ("py:class", "torch.utils.data.dataloader.DataLoader"),
]


def setup(app):
    app.add_directive("autosummary", AutolistAutosummary, override=True)
