# -*- coding: utf-8 -*-
"""
    pyspecific.py
    ~~~~~~~~~~~~~

    Sphinx extension with Python doc-specific markup.

    :copyright: 2008-2014 by Georg Brandl.
    :license: Python license.
"""

import re
import io
from os import getenv, path
from time import asctime
from pprint import pformat

from docutils import nodes
from docutils.io import StringOutput
from docutils.parsers.rst import directives
from docutils.utils import new_document, unescape
from sphinx import addnodes
from sphinx.builders import Builder
from sphinx.domains.changeset import VersionChange, versionlabels, versionlabel_classes
from sphinx.domains.python import PyFunction, PyMethod, PyModule
from sphinx.locale import _ as sphinx_gettext
from sphinx.util import logging
from sphinx.util.docutils import SphinxDirective
from sphinx.writers.text import TextWriter, TextTranslator
from sphinx.util.display import status_iterator


ISSUE_URI = 'https://bugs.python.org/issue?@action=redirect&bpo=%s'
GH_ISSUE_URI = 'https://github.com/python/cpython/issues/%s'
# Used in conf.py and updated here by python/release-tools/run_release.py
SOURCE_URI = 'https://github.com/python/cpython/tree/3.12/%s'

# monkey-patch reST parser to disable alphabetic and roman enumerated lists
from docutils.parsers.rst.states import Body
Body.enum.converters['loweralpha'] = \
    Body.enum.converters['upperalpha'] = \
    Body.enum.converters['lowerroman'] = \
    Body.enum.converters['upperroman'] = lambda x: None

# monkey-patch the productionlist directive to allow hyphens in group names
# https://github.com/sphinx-doc/sphinx/issues/11854
from sphinx.domains import std

std.token_re = re.compile(r'`((~?[\w-]*:)?\w+)`')

# backport :no-index:
PyModule.option_spec['no-index'] = directives.flag


# Support for marking up and linking to bugs.python.org issues

def issue_role(typ, rawtext, text, lineno, inliner, options={}, content=[]):
    issue = unescape(text)
    # sanity check: there are no bpo issues within these two values
    if 47261 < int(issue) < 400000:
        msg = inliner.reporter.error(f'The BPO ID {text!r} seems too high -- '
                                     'use :gh:`...` for GitHub IDs', line=lineno)
        prb = inliner.problematic(rawtext, rawtext, msg)
        return [prb], [msg]
    text = 'bpo-' + issue
    refnode = nodes.reference(text, text, refuri=ISSUE_URI % issue)
    return [refnode], []


# Support for marking up and linking to GitHub issues

def gh_issue_role(typ, rawtext, text, lineno, inliner, options={}, content=[]):
    issue = unescape(text)
    # sanity check: all GitHub issues have ID >= 32426
    # even though some of them are also valid BPO IDs
    if int(issue) < 32426:
        msg = inliner.reporter.error(f'The GitHub ID {text!r} seems too low -- '
                                     'use :issue:`...` for BPO IDs', line=lineno)
        prb = inliner.problematic(rawtext, rawtext, msg)
        return [prb], [msg]
    text = 'gh-' + issue
    refnode = nodes.reference(text, text, refuri=GH_ISSUE_URI % issue)
    return [refnode], []


# Support for marking up implementation details

class ImplementationDetail(SphinxDirective):

    has_content = True
    final_argument_whitespace = True

    # This text is copied to templates/dummy.html
    label_text = sphinx_gettext('CPython implementation detail:')

    def run(self):
        self.assert_has_content()
        pnode = nodes.compound(classes=['impl-detail'])
        content = self.content
        add_text = nodes.strong(self.label_text, self.label_text)
        self.state.nested_parse(content, self.content_offset, pnode)
        content = nodes.inline(pnode[0].rawsource, translatable=True)
        content.source = pnode[0].source
        content.line = pnode[0].line
        content += pnode[0].children
        pnode[0].replace_self(nodes.paragraph(
            '', '', add_text, nodes.Text(' '), content, translatable=False))
        return [pnode]


# Support for documenting platform availability

class Availability(SphinxDirective):

    has_content = True
    required_arguments = 1
    optional_arguments = 0
    final_argument_whitespace = True

    # known platform, libc, and threading implementations
    known_platforms = frozenset({
        "AIX", "Android", "BSD", "DragonFlyBSD", "Emscripten", "FreeBSD",
        "Linux", "NetBSD", "OpenBSD", "POSIX", "Solaris", "Unix", "VxWorks",
        "WASI", "Windows", "macOS",
        # libc
        "BSD libc", "glibc", "musl",
        # POSIX platforms with pthreads
        "pthreads",
    })

    def run(self):
        availability_ref = ':ref:`Availability <availability>`: '
        avail_nodes, avail_msgs = self.state.inline_text(
            availability_ref + self.arguments[0],
            self.lineno)
        pnode = nodes.paragraph(availability_ref + self.arguments[0],
                                '', *avail_nodes, *avail_msgs)
        self.set_source_info(pnode)
        cnode = nodes.container("", pnode, classes=["availability"])
        self.set_source_info(cnode)
        if self.content:
            self.state.nested_parse(self.content, self.content_offset, cnode)
        self.parse_platforms()

        return [cnode]

    def parse_platforms(self):
        """Parse platform information from arguments

        Arguments is a comma-separated string of platforms. A platform may
        be prefixed with "not " to indicate that a feature is not available.

        Example::

           .. availability:: Windows, Linux >= 4.2, not Emscripten, not WASI

        Arguments like "Linux >= 3.17 with glibc >= 2.27" are currently not
        parsed into separate tokens.
        """
        platforms = {}
        for arg in self.arguments[0].rstrip(".").split(","):
            arg = arg.strip()
            platform, _, version = arg.partition(" >= ")
            if platform.startswith("not "):
                version = False
                platform = platform[4:]
            elif not version:
                version = True
            platforms[platform] = version

        unknown = set(platforms).difference(self.known_platforms)
        if unknown:
            cls = type(self)
            logger = logging.getLogger(cls.__qualname__)
            logger.warning(
                f"Unknown platform(s) or syntax '{' '.join(sorted(unknown))}' "
                f"in '.. availability:: {self.arguments[0]}', see "
                f"{__file__}:{cls.__qualname__}.known_platforms for a set "
                "known platforms."
            )

        return platforms


# Support for documenting decorators

class PyDecoratorMixin(object):
    def handle_signature(self, sig, signode):
        ret = super(PyDecoratorMixin, self).handle_signature(sig, signode)
        signode.insert(0, addnodes.desc_addname('@', '@'))
        return ret

    def needs_arglist(self):
        return False


class PyDecoratorFunction(PyDecoratorMixin, PyFunction):
    def run(self):
        # a decorator function is a function after all
        self.name = 'py:function'
        return PyFunction.run(self)


# TODO: Use sphinx.domains.python.PyDecoratorMethod when possible
class PyDecoratorMethod(PyDecoratorMixin, PyMethod):
    def run(self):
        self.name = 'py:method'
        return PyMethod.run(self)


class PyCoroutineMixin(object):
    def handle_signature(self, sig, signode):
        ret = super(PyCoroutineMixin, self).handle_signature(sig, signode)
        signode.insert(0, addnodes.desc_annotation('coroutine ', 'coroutine '))
        return ret


class PyAwaitableMixin(object):
    def handle_signature(self, sig, signode):
        ret = super(PyAwaitableMixin, self).handle_signature(sig, signode)
        signode.insert(0, addnodes.desc_annotation('awaitable ', 'awaitable '))
        return ret


class PyCoroutineFunction(PyCoroutineMixin, PyFunction):
    def run(self):
        self.name = 'py:function'
        return PyFunction.run(self)


class PyCoroutineMethod(PyCoroutineMixin, PyMethod):
    def run(self):
        self.name = 'py:method'
        return PyMethod.run(self)


class PyAwaitableFunction(PyAwaitableMixin, PyFunction):
    def run(self):
        self.name = 'py:function'
        return PyFunction.run(self)


class PyAwaitableMethod(PyAwaitableMixin, PyMethod):
    def run(self):
        self.name = 'py:method'
        return PyMethod.run(self)


class PyAbstractMethod(PyMethod):

    def handle_signature(self, sig, signode):
        ret = super(PyAbstractMethod, self).handle_signature(sig, signode)
        signode.insert(0, addnodes.desc_annotation('abstractmethod ',
                                                   'abstractmethod '))
        return ret

    def run(self):
        self.name = 'py:method'
        return PyMethod.run(self)


# Support for documenting version of removal in deprecations

class DeprecatedRemoved(VersionChange):
    required_arguments = 2

    _deprecated_label = sphinx_gettext('Deprecated since version %s, will be removed in version %s')
    _removed_label = sphinx_gettext('Deprecated since version %s, removed in version %s')

    def run(self):
        # Replace the first two arguments (deprecated version and removed version)
        # with a single tuple of both versions.
        version_deprecated = self.arguments[0]
        version_removed = self.arguments.pop(1)
        self.arguments[0] = version_deprecated, version_removed

        # Set the label based on if we have reached the removal version
        current_version = tuple(map(int, self.config.version.split('.')))
        removed_version = tuple(map(int,  version_removed.split('.')))
        if current_version < removed_version:
            versionlabels[self.name] = self._deprecated_label
            versionlabel_classes[self.name] = 'deprecated'
        else:
            versionlabels[self.name] = self._removed_label
            versionlabel_classes[self.name] = 'removed'
        try:
            return super().run()
        finally:
            # reset versionlabels and versionlabel_classes
            versionlabels[self.name] = ''
            versionlabel_classes[self.name] = ''


# Support for including Misc/NEWS

issue_re = re.compile('(?:[Ii]ssue #|bpo-)([0-9]+)', re.I)
gh_issue_re = re.compile('(?:gh-issue-|gh-)([0-9]+)', re.I)
whatsnew_re = re.compile(r"(?im)^what's new in (.*?)\??$")


class MiscNews(SphinxDirective):
    has_content = False
    required_arguments = 1
    optional_arguments = 0
    final_argument_whitespace = False
    option_spec = {}

    def run(self):
        fname = self.arguments[0]
        source = self.state_machine.input_lines.source(
            self.lineno - self.state_machine.input_offset - 1)
        source_dir = getenv('PY_MISC_NEWS_DIR')
        if not source_dir:
            source_dir = path.dirname(path.abspath(source))
        fpath = path.join(source_dir, fname)
        self.env.note_dependency(path.abspath(fpath))
        try:
            with io.open(fpath, encoding='utf-8') as fp:
                content = fp.read()
        except Exception:
            text = 'The NEWS file is not available.'
            node = nodes.strong(text, text)
            return [node]
        content = issue_re.sub(r':issue:`\1`', content)
        # Fallback handling for the GitHub issue
        content = gh_issue_re.sub(r':gh:`\1`', content)
        content = whatsnew_re.sub(r'\1', content)
        # remove first 3 lines as they are the main heading
        lines = ['.. default-role:: obj', ''] + content.splitlines()[3:]
        self.state_machine.insert_input(lines, fname)
        return []


# Support for building "topic help" for pydoc

pydoc_topic_labels = [
    'assert', 'assignment', 'async', 'atom-identifiers', 'atom-literals',
    'attribute-access', 'attribute-references', 'augassign', 'await',
    'binary', 'bitwise', 'bltin-code-objects', 'bltin-ellipsis-object',
    'bltin-null-object', 'bltin-type-objects', 'booleans',
    'break', 'callable-types', 'calls', 'class', 'comparisons', 'compound',
    'context-managers', 'continue', 'conversions', 'customization', 'debugger',
    'del', 'dict', 'dynamic-features', 'else', 'exceptions', 'execmodel',
    'exprlists', 'floating', 'for', 'formatstrings', 'function', 'global',
    'id-classes', 'identifiers', 'if', 'imaginary', 'import', 'in', 'integers',
    'lambda', 'lists', 'naming', 'nonlocal', 'numbers', 'numeric-types',
    'objects', 'operator-summary', 'pass', 'power', 'raise', 'return',
    'sequence-types', 'shifting', 'slicings', 'specialattrs', 'specialnames',
    'string-methods', 'strings', 'subscriptions', 'truth', 'try', 'types',
    'typesfunctions', 'typesmapping', 'typesmethods', 'typesmodules',
    'typesseq', 'typesseq-mutable', 'unary', 'while', 'with', 'yield'
]


class PydocTopicsBuilder(Builder):
    name = 'pydoc-topics'

    default_translator_class = TextTranslator

    def init(self):
        self.topics = {}
        self.secnumbers = {}

    def get_outdated_docs(self):
        return 'all pydoc topics'

    def get_target_uri(self, docname, typ=None):
        return ''  # no URIs

    def write(self, *ignored):
        writer = TextWriter(self)
        for label in status_iterator(pydoc_topic_labels,
                                     'building topics... ',
                                     length=len(pydoc_topic_labels)):
            if label not in self.env.domaindata['std']['labels']:
                self.env.logger.warning(f'label {label!r} not in documentation')
                continue
            docname, labelid, sectname = self.env.domaindata['std']['labels'][label]
            doctree = self.env.get_and_resolve_doctree(docname, self)
            document = new_document('<section node>')
            document.append(doctree.ids[labelid])
            destination = StringOutput(encoding='utf-8')
            writer.write(document, destination)
            self.topics[label] = writer.output

    def finish(self):
        f = open(path.join(self.outdir, 'topics.py'), 'wb')
        try:
            f.write('# -*- coding: utf-8 -*-\n'.encode('utf-8'))
            f.write(('# Autogenerated by Sphinx on %s\n' % asctime()).encode('utf-8'))
            f.write('# as part of the release process.\n'.encode('utf-8'))
            f.write(('topics = ' + pformat(self.topics) + '\n').encode('utf-8'))
        finally:
            f.close()


# Support for documenting Opcodes

opcode_sig_re = re.compile(r'(\w+(?:\+\d)?)(?:\s*\((.*)\))?')


def parse_opcode_signature(env, sig, signode):
    """Transform an opcode signature into RST nodes."""
    m = opcode_sig_re.match(sig)
    if m is None:
        raise ValueError
    opname, arglist = m.groups()
    signode += addnodes.desc_name(opname, opname)
    if arglist is not None:
        paramlist = addnodes.desc_parameterlist()
        signode += paramlist
        paramlist += addnodes.desc_parameter(arglist, arglist)
    return opname.strip()


# Support for documenting pdb commands

pdbcmd_sig_re = re.compile(r'([a-z()!]+)\s*(.*)')

# later...
# pdbargs_tokens_re = re.compile(r'''[a-zA-Z]+  |  # identifiers
#                                   [.,:]+     |  # punctuation
#                                   [\[\]()]   |  # parens
#                                   \s+           # whitespace
#                                   ''', re.X)


def parse_pdb_command(env, sig, signode):
    """Transform a pdb command signature into RST nodes."""
    m = pdbcmd_sig_re.match(sig)
    if m is None:
        raise ValueError
    name, args = m.groups()
    fullname = name.replace('(', '').replace(')', '')
    signode += addnodes.desc_name(name, name)
    if args:
        signode += addnodes.desc_addname(' '+args, ' '+args)
    return fullname


def parse_monitoring_event(env, sig, signode):
    """Transform a monitoring event signature into RST nodes."""
    signode += addnodes.desc_addname('sys.monitoring.events.', 'sys.monitoring.events.')
    signode += addnodes.desc_name(sig, sig)
    return sig


def patch_pairindextypes(app, _env) -> None:
    """Remove all entries from ``pairindextypes`` before writing POT files.

    We want to run this just before writing output files, as the check to
    circumvent is in ``I18nBuilder.write_doc()``.
    As such, we link this to ``env-check-consistency``, even though it has
    nothing to do with the environment consistency check.
    """
    if app.builder.name != 'gettext':
        return

    # allow translating deprecated index entries
    try:
        from sphinx.domains.python import pairindextypes
    except ImportError:
        pass
    else:
        # Sphinx checks if a 'pair' type entry on an index directive is one of
        # the Sphinx-translated pairindextypes values. As we intend to move
        # away from this, we need Sphinx to believe that these values don't
        # exist, by deleting them when using the gettext builder.
        pairindextypes.clear()


def setup(app):
    app.add_role('issue', issue_role)
    app.add_role('gh', gh_issue_role)
    app.add_directive('impl-detail', ImplementationDetail)
    app.add_directive('availability', Availability)
    app.add_directive('deprecated-removed', DeprecatedRemoved)
    app.add_builder(PydocTopicsBuilder)
    app.add_object_type('opcode', 'opcode', '%s (opcode)', parse_opcode_signature)
    app.add_object_type('pdbcommand', 'pdbcmd', '%s (pdb command)', parse_pdb_command)
    app.add_object_type('monitoring-event', 'monitoring-event', '%s (monitoring event)', parse_monitoring_event)
    app.add_object_type('2to3fixer', '2to3fixer', '%s (2to3 fixer)')
    app.add_directive_to_domain('py', 'decorator', PyDecoratorFunction)
    app.add_directive_to_domain('py', 'decoratormethod', PyDecoratorMethod)
    app.add_directive_to_domain('py', 'coroutinefunction', PyCoroutineFunction)
    app.add_directive_to_domain('py', 'coroutinemethod', PyCoroutineMethod)
    app.add_directive_to_domain('py', 'awaitablefunction', PyAwaitableFunction)
    app.add_directive_to_domain('py', 'awaitablemethod', PyAwaitableMethod)
    app.add_directive_to_domain('py', 'abstractmethod', PyAbstractMethod)
    app.add_directive('miscnews', MiscNews)
    app.connect('env-check-consistency', patch_pairindextypes)
    return {'version': '1.0', 'parallel_read_safe': True}
