#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Pybricks documentation build configuration file, created by
# sphinx-quickstart on Thu Sep  6 15:31:12 2018.
#
# This file is execfile()d with the current directory set to its
# containing dir.
#
# Note that not all possible configuration values are present in this
# autogenerated file.
#
# All configuration values have a default; values that are commented out
# serve to show the default.

# 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.
#
# flake8: noqa

import os
import re
import sys

from docutils import nodes
from docutils.parsers.rst.directives import flag
from docutils.parsers.rst import Directive
from sphinx.application import Sphinx
from sphinx.addnodes import pending_xref
from sphinx.environment import BuildEnvironment
from sphinx.util.nodes import make_refnode
import toml

TOP_DIR = os.path.abspath(os.path.join("..", ".."))
sys.path.insert(0, os.path.join(TOP_DIR, "src"))
sys.path.append(os.path.abspath("../common/extensions"))

# ON_RTD is whether we are on readthedocs.org
# this line of code grabbed from docs.readthedocs.org
ON_RTD = os.environ.get("READTHEDOCS", None) == "True"

_pyproject = toml.load(os.path.join(TOP_DIR, "pyproject.toml"))

# -- 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.napoleon",
    "sphinx.ext.todo",
    "sphinx.ext.mathjax",
    # Custom Pybricks extensions
    "color",
    "classlink",
    "requirements",
    "requirements-static",
    "versionchanged",
]

# Add any paths that contain templates here, relative to this directory.
templates_path = ["../common/_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 version info for the project you're documenting, acts as replacement for
# |version| and |release|, also used in various other places throughout the
# built documents.
#
# The full version, including alpha/beta/rc tags.
release = "v" + _pyproject["tool"]["poetry"]["version"]
# The short X.Y version.
version = re.match(r"(v\d+\.\d+)", release)[0]

# 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"

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

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

# Figure numbering
numfig = True
numfig_format = {
    "figure": "Figure %s",
    "table": "Table %s",
    "code-block": "Listing %s",
    "section": "Section %s",
}

# Find cross-reference errors
nitpicky = True

# https://stackoverflow.com/a/30624034/1976323
nitpick_ignore = [
    ("py:class", "bool"),
    ("py:class", "bytearray"),
    ("py:class", "bytes"),
    ("py:class", "callable"),
    ("py:class", "dict"),
    ("py:class", "float"),
    ("py:class", "int"),
    ("py:class", "iter"),
    ("py:class", "list"),
    ("py:class", "object"),
    ("py:class", "str"),
    ("py:class", "tuple"),
    ("py:exc", "OSError"),
    ("py:exc", "RuntimeError"),
    ("py:exc", "TypeError"),
    ("py:exc", "ValueError"),
]

# not sure why, but this is needed for typing.IO in uselect
nitpick_ignore.append(("py:obj", "typing.IO"))

# -- Autodoc options ------------------------------------------------------

autodoc_member_order = "bysource"
autodoc_default_options = {
    "members": True,
    "undoc-members": True,
}
autoclass_content = "both"  # This ensures init arguments are not ignored
add_module_names = False  # Hide module name

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

if ON_RTD:
    html_theme = "default"
else:
    import sphinx_rtd_theme

    html_theme = "sphinx_rtd_theme"
    html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]

html_context = {
    "disclaimer": _DISCLAIMER,
}

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

# 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 = {
    "style_external_links": True,
    "logo_only": True,
}

# 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 = ["../common/_static"]

# Custom sidebar templates, must be a dictionary that maps document names
# to template names.
#
# This is required for the alabaster theme
# refs: http://alabaster.readthedocs.io/en/latest/installation.html#sidebars
html_sidebars = {
    "**": [
        "relations.html",  # needs 'show_related': True theme option to display
        "searchbox.html",
    ]
}

# Don't hyperlink to larger images for scaled images.
html_scaled_image_link = False

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

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


# -- 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": r"""
    \usepackage{CJKutf8}
    \makeatletter
    \fancypagestyle{normal}{
        \fancyhf{}
        \fancyfoot[R]{{\py@HeaderFamily\thepage}}
        \fancyfoot[C]{\raisebox{-7mm}{\tiny %(disclaimer)s}}
        \fancyhead[L]{{\py@HeaderFamily \@title}}
        \fancyhead[R]{{\py@HeaderFamily \py@release}}
        \renewcommand{\headrulewidth}{0.4pt}
        \renewcommand{\footrulewidth}{0.4pt}
    }
    \fancypagestyle{plain}{
        \fancyhf{}
        \fancyfoot[R]{{\py@HeaderFamily\thepage}}
        \fancyfoot[C]{\raisebox{-7mm}{\tiny %(disclaimer)s}}
        \renewcommand{\headrulewidth}{0.4pt}
        \renewcommand{\footrulewidth}{0.4pt}
    }
    \makeatother
    """
    % {
        "disclaimer": " ".join((_DISCLAIMER, "©", copyright)),
    },
    # Latex figure (float) alignment
    #
    # 'figure_align': 'htbp',
    "extraclassoptions": "openany,oneside",
    "releasename": "Version",
}

# 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, "".join([project, "-v", version, ".tex"]), _TITLE, author, "manual"),
]

# -- Content control -----------------------------------------------------


exclude_patterns = [
    "ev3devices.rst",
    "hubs/ev3brick.rst",
    "iodevices/analogsensor.rst",
    "iodevices/dcmotor.rst",
    "iodevices/ev3devsensor.rst",
    "iodevices/i2cdevice.rst",
    "iodevices/lumpdevice.rst",
    "iodevices/uartdevice.rst",
    "media.rst",
    "messaging.rst",
    "nxtdevices.rst",
    "tools/datalog.rst",
]


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


# -- .. availability:: directive


class AvailabilityDirective(Directive):
    has_content = True
    option_spec = {
        "movehub": flag,
        "cityhub": flag,
        "technichub": flag,
        "ev3dev-stretch": flag,
    }

    def run(self):
        if not self.options:
            raise self.error("Must specify at least one platform.")
        # TODO: make links to platform pages
        return [
            nodes.emphasis(text="Availability: "),
            nodes.Text(", ".join(self.options)),
        ]


def on_missing_reference(
    app: Sphinx, env: BuildEnvironment, node: pending_xref, contnode: nodes.Element
) -> nodes.Element:
    # The Number type alias is on the Signals and Units page instead of on the
    # pybricks.parameters page so normal resolution doesn't work
    if node["reftype"] == "class" and node["reftarget"] == "Number":
        return make_refnode(
            app.builder, node["refdoc"], "signaltypes", "numbers", contnode
        )

    # References with special characters can't exist, so we have to supress
    # warnings when Sphinx tries to cross reference units like deg/s. For
    # consistency, we also treat units without special characters this way.
    for unit in [
        "deg",
        "deg/s",
        "deg/s²",
        "mm",
        "mm/s",
        "mm/s²",
        "%",
        "mV",
        "mA",
        "ms",
        "mNm",
        "Hz",
        "°C",
        "J",
        "Ω",
        "N",
    ]:

        # If they match on raw source, we are dealing with argument types.
        if unit == contnode.rawsource:
            # Return as-is to suppress missing cross reference warning. We
            # could make this more fancy by returning an xref node that links
            # to the signals page.
            return contnode

        # Return types are denoted as "int: deg"
        try:
            # Try to unpack the node.
            ret_type, ret_unit = str(contnode).split(": ")
        except ValueError:
            # Not a valid format, so skip.
            continue

        # If it's a match, we could format the node so it looks a bit nicer.
        # For now just keep the colon notation as is.
        if unit == ret_unit:
            return nodes.Text(f"{ret_type}: {ret_unit}")


def setup(app: Sphinx):
    app.add_directive("availability", AvailabilityDirective)
    app.connect("missing-reference", on_missing_reference)


# -- Python domain hacks ---------------------------------------------------