#!/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
import tomllib

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

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"

with open(os.path.join(TOP_DIR, "pyproject.toml"), "rb") as _f:
    _pyproject = tomllib.load(_f)

# -- 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",
    # Custom Pybricks extensions
    "awaitable",
    "blockimg",
    "color",
    "classlink",
    "docstring_signature",
    "nestedmethod",
    "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": "restructuredtext"}

# 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"))

# MaybeAwaitable* stub types have no documented target; the awaitable
# extension renders them as an "await" prefix instead, but the raw names can
# still leak into signatures (e.g. overloads), so suppress those warnings.
nitpick_ignore_regex = [
    ("py:class", r"MaybeAwaitable\w*"),
]

# -- 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 ----------------------------------------------

# The theme to use for HTML and HTML Help pages.  Since sphinx-rtd-theme 1.2
# themes are registered via entry points, so setting html_theme is all that
# is needed (no extensions entry or html_theme_path).
html_theme = "sphinx_rtd_theme"

# 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 = {
    # Hide the next/previous buttons at the bottom of each page.
    "prev_next_buttons_location": None,
}

html_show_sourcelink = False
html_copy_source = False

html_context = {
    "disclaimer": _DISCLAIMER,
}

# 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"]

# 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"


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


exclude_patterns = [
    "hubs/ev3brick.rst",
    "media.rst",
    "messaging.rst",
    "tools/datalog.rst",
    "*.rst.txt",
]


# 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 suppress
    # 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 [
        "dBm",
        "deg",
        "deg/s",
        "deg/s²",
        "mm",
        "mm/s",
        "mm/s²",
        "%",
        "mV",
        "mA",
        "ms",
        "mNm",
        "Hz",
        "°C",
        "J",
        "Ω",
        "N",
    ]:
        try:
            # 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

        except AttributeError:
            pass

        # 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 on_build_finished(app: Sphinx, exception):
    if exception or app.builder.name != "html":
        return
    import json
    from sphinx.util.inventory import InventoryFile

    inv_path = os.path.join(app.outdir, "objects.inv")
    if not os.path.exists(inv_path):
        return

    with open(inv_path, "rb") as f:
        inv = InventoryFile.load(f, "", lambda base, uri: base + uri)

    index = {}
    for type_key, entries in inv.items():
        if not type_key.startswith("py:"):
            continue
        for name, item in entries.items():
            index[name] = item.uri

    out_path = os.path.join(app.outdir, "namespace_index.json")
    with open(out_path, "w") as f:
        json.dump(index, f, indent=2, sort_keys=True)


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


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