# -*- coding: utf-8 -*-
"""
    sphinx.config
    ~~~~~~~~~~~~~

    Build configuration file handling.

    :copyright: Copyright 2007-2016 by the Sphinx team, see AUTHORS.
    :license: BSD, see LICENSE for details.
"""

import re
from os import path, environ, getenv
import shlex

from six import PY2, PY3, iteritems, string_types, binary_type, text_type, integer_types

from sphinx.errors import ConfigError
from sphinx.locale import l_
from sphinx.util.osutil import make_filename, cd
from sphinx.util.pycompat import execfile_, NoneType
from sphinx.util.i18n import format_date

nonascii_re = re.compile(br'[\x80-\xff]')
copyright_year_re = re.compile(r'^((\d{4}-)?)(\d{4})(?=[ ,])')

CONFIG_SYNTAX_ERROR = "There is a syntax error in your configuration file: %s"
if PY3:
    CONFIG_SYNTAX_ERROR += "\nDid you change the syntax from 2.x to 3.x?"
CONFIG_EXIT_ERROR = "The configuration file (or one of the modules it imports) " \
                    "called sys.exit()"
CONFIG_TYPE_WARNING = "The config value `{name}' has type `{current.__name__}', " \
                      "defaults to `{default.__name__}.'"


string_classes = [text_type]
if PY2:
    string_classes.append(binary_type)  # => [str, unicode]


class Config(object):
    """
    Configuration file abstraction.
    """

    # the values are: (default, what needs to be rebuilt if changed)

    # If you add a value here, don't forget to include it in the
    # quickstart.py file template as well as in the docs!

    config_values = dict(
        # general options
        project = ('Python', 'env'),
        copyright = ('', 'html'),
        version = ('', 'env'),
        release = ('', 'env'),
        today = ('', 'env'),
        # the real default is locale-dependent
        today_fmt = (None, 'env', string_classes),

        language = (None, 'env', string_classes),
        locale_dirs = ([], 'env'),
        figure_language_filename = (u'{root}.{language}{ext}', 'env', [str]),

        master_doc = ('contents', 'env'),
        source_suffix = (['.rst'], 'env'),
        source_encoding = ('utf-8-sig', 'env'),
        source_parsers = ({}, 'env'),
        exclude_patterns = ([], 'env'),
        default_role = (None, 'env', string_classes),
        add_function_parentheses = (True, 'env'),
        add_module_names = (True, 'env'),
        trim_footnote_reference_space = (False, 'env'),
        show_authors = (False, 'env'),
        pygments_style = (None, 'html', string_classes),
        highlight_language = ('default', 'env'),
        highlight_options = ({}, 'env'),
        templates_path = ([], 'html'),
        template_bridge = (None, 'html', string_classes),
        keep_warnings = (False, 'env'),
        suppress_warnings = ([], 'env'),
        modindex_common_prefix = ([], 'html'),
        rst_epilog = (None, 'env', string_classes),
        rst_prolog = (None, 'env', string_classes),
        trim_doctest_flags = (True, 'env'),
        primary_domain = ('py', 'env', [NoneType]),
        needs_sphinx = (None, None, string_classes),
        needs_extensions = ({}, None),
        nitpicky = (False, 'env'),
        nitpick_ignore = ([], 'html'),
        numfig = (False, 'env'),
        numfig_secnum_depth = (1, 'env'),
        numfig_format = ({'figure': l_('Fig. %s'),
                          'table': l_('Table %s'),
                          'code-block': l_('Listing %s')},
                         'env'),

        # HTML options
        html_theme = ('alabaster', 'html'),
        html_theme_path = ([], 'html'),
        html_theme_options = ({}, 'html'),
        html_title = (lambda self: l_('%s %s documentation') %
                      (self.project, self.release),
                      'html', string_classes),
        html_short_title = (lambda self: self.html_title, 'html'),
        html_style = (None, 'html', string_classes),
        html_logo = (None, 'html', string_classes),
        html_favicon = (None, 'html', string_classes),
        html_static_path = ([], 'html'),
        html_extra_path = ([], 'html'),
        # the real default is locale-dependent
        html_last_updated_fmt = (None, 'html', string_classes),
        html_use_smartypants = (True, 'html'),
        html_translator_class = (None, 'html', string_classes),
        html_sidebars = ({}, 'html'),
        html_additional_pages = ({}, 'html'),
        html_use_modindex = (True, 'html'),  # deprecated
        html_domain_indices = (True, 'html', [list]),
        html_add_permalinks = (u'\u00B6', 'html'),
        html_use_index = (True, 'html'),
        html_split_index = (False, 'html'),
        html_copy_source = (True, 'html'),
        html_show_sourcelink = (True, 'html'),
        html_use_opensearch = ('', 'html'),
        html_file_suffix = (None, 'html', string_classes),
        html_link_suffix = (None, 'html', string_classes),
        html_show_copyright = (True, 'html'),
        html_show_sphinx = (True, 'html'),
        html_context = ({}, 'html'),
        html_output_encoding = ('utf-8', 'html'),
        html_compact_lists = (True, 'html'),
        html_secnumber_suffix = ('. ', 'html'),
        html_search_language = (None, 'html', string_classes),
        html_search_options = ({}, 'html'),
        html_search_scorer = ('', None),
        html_scaled_image_link = (True, 'html'),

        # HTML help only options
        htmlhelp_basename = (lambda self: make_filename(self.project), None),

        # Qt help only options
        qthelp_basename = (lambda self: make_filename(self.project), None),

        # Devhelp only options
        devhelp_basename = (lambda self: make_filename(self.project), None),

        # Apple help options
        applehelp_bundle_name = (lambda self: make_filename(self.project),
                                 'applehelp'),
        applehelp_bundle_id = (None, 'applehelp', string_classes),
        applehelp_dev_region = ('en-us', 'applehelp'),
        applehelp_bundle_version = ('1', 'applehelp'),
        applehelp_icon = (None, 'applehelp', string_classes),
        applehelp_kb_product = (lambda self: '%s-%s' %
                                (make_filename(self.project), self.release),
                                'applehelp'),
        applehelp_kb_url = (None, 'applehelp', string_classes),
        applehelp_remote_url = (None, 'applehelp', string_classes),
        applehelp_index_anchors = (False, 'applehelp', string_classes),
        applehelp_min_term_length = (None, 'applehelp', string_classes),
        applehelp_stopwords = (lambda self: self.language or 'en', 'applehelp'),
        applehelp_locale = (lambda self: self.language or 'en', 'applehelp'),
        applehelp_title = (lambda self: self.project + ' Help', 'applehelp'),
        applehelp_codesign_identity = (lambda self:
                                       environ.get('CODE_SIGN_IDENTITY', None),
                                       'applehelp'),
        applehelp_codesign_flags = (lambda self:
                                    shlex.split(
                                        environ.get('OTHER_CODE_SIGN_FLAGS',
                                                    '')),
                                    'applehelp'),
        applehelp_indexer_path = ('/usr/bin/hiutil', 'applehelp'),
        applehelp_codesign_path = ('/usr/bin/codesign', 'applehelp'),
        applehelp_disable_external_tools = (False, None),

        # Epub options
        epub_basename = (lambda self: make_filename(self.project), None),
        epub_theme = ('epub', 'html'),
        epub_theme_options = ({}, 'html'),
        epub_title = (lambda self: self.html_title, 'html'),
        epub3_description = ('', 'epub3', string_classes),
        epub_author = ('unknown', 'html'),
        epub3_contributor = ('unknown', 'epub3', string_classes),
        epub_language = (lambda self: self.language or 'en', 'html'),
        epub_publisher = ('unknown', 'html'),
        epub_copyright = (lambda self: self.copyright, 'html'),
        epub_identifier = ('unknown', 'html'),
        epub_scheme = ('unknown', 'html'),
        epub_uid = ('unknown', 'env'),
        epub_cover = ((), 'env'),
        epub_guide = ((), 'env'),
        epub_pre_files = ([], 'env'),
        epub_post_files = ([], 'env'),
        epub_exclude_files = ([], 'env'),
        epub_tocdepth = (3, 'env'),
        epub_tocdup = (True, 'env'),
        epub_tocscope = ('default', 'env'),
        epub_fix_images = (False, 'env'),
        epub_max_image_width = (0, 'env'),
        epub_show_urls = ('inline', 'html'),
        epub_use_index = (lambda self: self.html_use_index, 'html'),
        epub3_page_progression_direction = ('ltr', 'epub3', string_classes),

        # LaTeX options
        latex_documents = (lambda self: [(self.master_doc,
                                          make_filename(self.project) + '.tex',
                                          self.project,
                                          '', 'manual')],
                           None),
        latex_logo = (None, None, string_classes),
        latex_appendices = ([], None),
        # now deprecated - use latex_toplevel_sectioning
        latex_use_parts = (False, None),
        latex_toplevel_sectioning = (None, None, [str]),
        latex_use_modindex = (True, None),  # deprecated
        latex_domain_indices = (True, None, [list]),
        latex_show_urls = ('no', None),
        latex_show_pagerefs = (False, None),
        # paper_size and font_size are still separate values
        # so that you can give them easily on the command line
        latex_paper_size = ('letter', None),
        latex_font_size = ('10pt', None),
        latex_elements = ({}, None),
        latex_additional_files = ([], None),
        latex_docclass = ({}, None),
        # now deprecated - use latex_elements
        latex_preamble = ('', None),

        # text options
        text_sectionchars = ('*=-~"+`', 'env'),
        text_newlines = ('unix', 'env'),

        # manpage options
        man_pages = (lambda self: [(self.master_doc,
                                    make_filename(self.project).lower(),
                                    '%s %s' % (self.project, self.release),
                                    [], 1)],
                     None),
        man_show_urls = (False, None),

        # Texinfo options
        texinfo_documents = (lambda self: [(self.master_doc,
                                            make_filename(self.project).lower(),
                                            self.project, '',
                                            make_filename(self.project),
                                            'The %s reference manual.' %
                                            make_filename(self.project),
                                            'Python')],
                             None),
        texinfo_appendices = ([], None),
        texinfo_elements = ({}, None),
        texinfo_domain_indices = (True, None, [list]),
        texinfo_show_urls = ('footnote', None),
        texinfo_no_detailmenu = (False, None),

        # linkcheck options
        linkcheck_ignore = ([], None),
        linkcheck_retries = (1, None),
        linkcheck_timeout = (None, None, [int]),
        linkcheck_workers = (5, None),
        linkcheck_anchors = (True, None),

        # gettext options
        gettext_compact = (True, 'gettext'),
        gettext_location = (True, 'gettext'),
        gettext_uuid = (False, 'gettext'),
        gettext_auto_build = (True, 'env'),
        gettext_additional_targets = ([], 'env'),

        # XML options
        xml_pretty = (True, 'env'),
    )

    def __init__(self, dirname, filename, overrides, tags):
        self.overrides = overrides
        self.values = Config.config_values.copy()
        config = {}
        if 'extensions' in overrides:  # XXX do we need this?
            if isinstance(overrides['extensions'], string_types):
                config['extensions'] = overrides.pop('extensions').split(',')
            else:
                config['extensions'] = overrides.pop('extensions')
        if dirname is not None:
            config_file = path.join(dirname, filename)
            config['__file__'] = config_file
            config['tags'] = tags
            with cd(dirname):
                # we promise to have the config dir as current dir while the
                # config file is executed
                try:
                    execfile_(filename, config)
                except SyntaxError as err:
                    raise ConfigError(CONFIG_SYNTAX_ERROR % err)
                except SystemExit:
                    raise ConfigError(CONFIG_EXIT_ERROR)

        self._raw_config = config
        # these two must be preinitialized because extensions can add their
        # own config values
        self.setup = config.get('setup', None)
        self.extensions = config.get('extensions', [])

        # correct values of copyright year that are not coherent with
        # the SOURCE_DATE_EPOCH environment variable (if set)
        # See https://reproducible-builds.org/specs/source-date-epoch/
        if getenv('SOURCE_DATE_EPOCH') is not None:
            for k in ('copyright', 'epub_copyright'):
                if k in config:
                    config[k] = copyright_year_re.sub('\g<1>%s' % format_date('%Y'),
                                                      config[k])

    def check_types(self, warn):
        # check all values for deviation from the default value's type, since
        # that can result in TypeErrors all over the place
        # NB. since config values might use l_() we have to wait with calling
        # this method until i18n is initialized
        for name in self._raw_config:
            if name not in self.values:
                continue  # we don't know a default value
            settings = self.values[name]
            default, dummy_rebuild = settings[:2]
            permitted = settings[2] if len(settings) == 3 else ()

            if hasattr(default, '__call__'):
                default = default(self)  # could invoke l_()
            if default is None and not permitted:
                continue  # neither inferrable nor expliclitly permitted types
            current = self[name]
            if type(current) is type(default):
                continue
            if type(current) in permitted:
                continue

            common_bases = (set(type(current).__bases__ + (type(current),)) &
                            set(type(default).__bases__))
            common_bases.discard(object)
            if common_bases:
                continue  # at least we share a non-trivial base class

            warn(CONFIG_TYPE_WARNING.format(
                name=name, current=type(current), default=type(default)))

    def check_unicode(self, warn):
        # check all string values for non-ASCII characters in bytestrings,
        # since that can result in UnicodeErrors all over the place
        for name, value in iteritems(self._raw_config):
            if isinstance(value, binary_type) and nonascii_re.search(value):
                warn('the config value %r is set to a string with non-ASCII '
                     'characters; this can lead to Unicode errors occurring. '
                     'Please use Unicode strings, e.g. %r.' % (name, u'Content'))

    def convert_overrides(self, name, value):
        if not isinstance(value, string_types):
            return value
        else:
            defvalue = self.values[name][0]
            if isinstance(defvalue, dict):
                raise ValueError('cannot override dictionary config setting %r, '
                                 'ignoring (use %r to set individual elements)' %
                                 (name, name + '.key=value'))
            elif isinstance(defvalue, list):
                return value.split(',')
            elif isinstance(defvalue, integer_types):
                try:
                    return int(value)
                except ValueError:
                    raise ValueError('invalid number %r for config value %r, ignoring' %
                                     (value, name))
            elif hasattr(defvalue, '__call__'):
                return value
            elif defvalue is not None and not isinstance(defvalue, string_types):
                raise ValueError('cannot override config setting %r with unsupported '
                                 'type, ignoring' % name)
            else:
                return value

    def pre_init_values(self, warn):
        """Initialize some limited config variables before loading extensions"""
        variables = ['needs_sphinx', 'suppress_warnings']
        for name in variables:
            try:
                if name in self.overrides:
                    self.__dict__[name] = self.convert_overrides(name, self.overrides[name])
                elif name in self._raw_config:
                    self.__dict__[name] = self._raw_config[name]
            except ValueError as exc:
                warn(exc)

    def init_values(self, warn):
        config = self._raw_config
        for valname, value in iteritems(self.overrides):
            try:
                if '.' in valname:
                    realvalname, key = valname.split('.', 1)
                    config.setdefault(realvalname, {})[key] = value
                    continue
                elif valname not in self.values:
                    warn('unknown config value %r in override, ignoring' % valname)
                    continue
                if isinstance(value, string_types):
                    config[valname] = self.convert_overrides(valname, value)
                else:
                    config[valname] = value
            except ValueError as exc:
                warn(exc)
        for name in config:
            if name in self.values:
                self.__dict__[name] = config[name]
        if isinstance(self.source_suffix, string_types):
            self.source_suffix = [self.source_suffix]

    def __getattr__(self, name):
        if name.startswith('_'):
            raise AttributeError(name)
        if name not in self.values:
            raise AttributeError('No such config value: %s' % name)
        default = self.values[name][0]
        if hasattr(default, '__call__'):
            return default(self)
        return default

    def __getitem__(self, name):
        return getattr(self, name)

    def __setitem__(self, name, value):
        setattr(self, name, value)

    def __delitem__(self, name):
        delattr(self, name)

    def __contains__(self, name):
        return name in self.values
