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# Source code for mopidy.config

    from __future__ import absolute_import, unicode_literals

    import io
    import itertools
    import logging
    import os.path
    import re

    from mopidy import compat
    from mopidy.compat import configparser
    from mopidy.config import keyring
    from mopidy.config.schemas import *  # noqa
    from mopidy.config.types import *  # noqa
    from mopidy.utils import path, versioning

    logger = logging.getLogger(__name__)

    _logging_schema = ConfigSchema('logging')
    _logging_schema['color'] = Boolean()
    _logging_schema['console_format'] = String()
    _logging_schema['debug_format'] = String()
    _logging_schema['debug_file'] = Path()
    _logging_schema['config_file'] = Path(optional=True)

    _loglevels_schema = MapConfigSchema('loglevels', LogLevel())
    _logcolors_schema = MapConfigSchema('logcolors', LogColor())

    _audio_schema = ConfigSchema('audio')
    _audio_schema['mixer'] = String()
    _audio_schema['mixer_track'] = Deprecated()
    _audio_schema['mixer_volume'] = Integer(optional=True, minimum=0, maximum=100)
    _audio_schema['output'] = String()
    _audio_schema['visualizer'] = Deprecated()

    _proxy_schema = ConfigSchema('proxy')
    _proxy_schema['scheme'] = String(optional=True,
                                     choices=['http', 'https', 'socks4', 'socks5'])
    _proxy_schema['hostname'] = Hostname(optional=True)
    _proxy_schema['port'] = Port(optional=True)
    _proxy_schema['username'] = String(optional=True)
    _proxy_schema['password'] = Secret(optional=True)

    # NOTE: if multiple outputs ever comes something like LogLevelConfigSchema
    # _outputs_schema = config.AudioOutputConfigSchema()

    _schemas = [_logging_schema, _loglevels_schema, _logcolors_schema,
                _audio_schema, _proxy_schema]

    _INITIAL_HELP = """
    # For further information about options in this file see:
    #   http://docs.mopidy.com/
    #
    # The initial commented out values reflect the defaults as of:
    #   %(versions)s
    #
    # Available options and defaults might have changed since then,
    # run `mopidy config` to see the current effective config and
    # `mopidy --version` to check the current version.
    """

    def read(config_file):
        """Helper to load config defaults in same way across core and extensions"""
        with io.open(config_file, 'rb') as filehandle:
            return filehandle.read()

    def load(files, extensions, overrides):
        # Helper to get configs, as the rest of our config system should not need
        # to know about extensions.
        config_dir = os.path.dirname(__file__)
        defaults = [read(os.path.join(config_dir, 'default.conf'))]
        defaults.extend(e.get_default_config() for e in extensions)
        raw_config = _load(files, defaults, keyring.fetch() + (overrides or []))

        schemas = _schemas[:]
        schemas.extend(e.get_config_schema() for e in extensions)
        return _validate(raw_config, schemas)

    def format(config, extensions, comments=None, display=True):
        # Helper to format configs, as the rest of our config system should not
        # need to know about extensions.
        schemas = _schemas[:]
        schemas.extend(e.get_config_schema() for e in extensions)
        return _format(config, comments or {}, schemas, display, False)

    def format_initial(extensions):
        config_dir = os.path.dirname(__file__)
        defaults = [read(os.path.join(config_dir, 'default.conf'))]
        defaults.extend(e.get_default_config() for e in extensions)
        raw_config = _load([], defaults, [])

        schemas = _schemas[:]
        schemas.extend(e.get_config_schema() for e in extensions)

        config, errors = _validate(raw_config, schemas)

        versions = ['Mopidy %s' % versioning.get_version()]
        for extension in sorted(extensions, key=lambda ext: ext.dist_name):
            versions.append('%s %s' % (extension.dist_name, extension.version))

        header = _INITIAL_HELP.strip() % {'versions': '\n#   '.join(versions)}
        formatted_config = _format(
            config=config, comments={}, schemas=schemas,
            display=False, disable=True).decode('utf-8')
        return header + '\n\n' + formatted_config

    def _load(files, defaults, overrides):
        parser = configparser.RawConfigParser()

        # TODO: simply return path to config file for defaults so we can load it
        # all in the same way?
        logger.info('Loading config from builtin defaults')
        for default in defaults:
            if isinstance(default, compat.text_type):
                default = default.encode('utf-8')
            parser.readfp(io.BytesIO(default))

        # Load config from a series of config files
        files = [path.expand_path(f) for f in files]
        for name in files:
            if os.path.isdir(name):
                for filename in os.listdir(name):
                    filename = os.path.join(name, filename)
                    if os.path.isfile(filename) and filename.endswith('.conf'):
                        _load_file(parser, filename)
            else:
                _load_file(parser, name)

        # If there have been parse errors there is a python bug that causes the
        # values to be lists, this little trick coerces these into strings.
        parser.readfp(io.BytesIO())

        raw_config = {}
        for section in parser.sections():
            raw_config[section] = dict(parser.items(section))

        logger.info('Loading config from command line options')
        for section, key, value in overrides:
            raw_config.setdefault(section, {})[key] = value

        return raw_config

    def _load_file(parser, filename):
        if not os.path.exists(filename):
            logger.debug(
                'Loading config from %s failed; it does not exist', filename)
            return
        if not os.access(filename, os.R_OK):
            logger.warning(
                'Loading config from %s failed; read permission missing',
                filename)
            return

        try:
            logger.info('Loading config from %s', filename)
            with io.open(filename, 'rb') as filehandle:
                parser.readfp(filehandle)
        except configparser.MissingSectionHeaderError as e:
            logger.warning('%s does not have a config section, not loaded.',
                           filename)
        except configparser.ParsingError as e:
            linenos = ', '.join(str(lineno) for lineno, line in e.errors)
            logger.warning(
                '%s has errors, line %s has been ignored.', filename, linenos)
        except IOError:
            # TODO: if this is the initial load of logging config we might not
            # have a logger at this point, we might want to handle this better.
            logger.debug('Config file %s not found; skipping', filename)

    def _validate(raw_config, schemas):
        # Get validated config
        config = {}
        errors = {}
        sections = set(raw_config)
        for schema in schemas:
            sections.discard(schema.name)
            values = raw_config.get(schema.name, {})
            result, error = schema.deserialize(values)
            if error:
                errors[schema.name] = error
            if result:
                config[schema.name] = result

        for section in sections:
            logger.debug('Ignoring unknown config section: %s', section)

        return config, errors

    def _format(config, comments, schemas, display, disable):
        output = []
        for schema in schemas:
            serialized = schema.serialize(
                config.get(schema.name, {}), display=display)
            if not serialized:
                continue
            output.append(b'[%s]' % bytes(schema.name))
            for key, value in serialized.items():
                if isinstance(value, types.DeprecatedValue):
                    continue
                comment = bytes(comments.get(schema.name, {}).get(key, ''))
                output.append(b'%s =' % bytes(key))
                if value is not None:
                    output[-1] += b' ' + value
                if comment:
                    output[-1] += b'  ; ' + comment.capitalize()
                if disable:
                    output[-1] = re.sub(r'^', b'#', output[-1], flags=re.M)
            output.append(b'')
        return b'\n'.join(output).strip()

    def _preprocess(config_string):
        """Convert a raw config into a form that preserves comments etc."""
        results = ['[__COMMENTS__]']
        counter = itertools.count(0)

        section_re = re.compile(r'^(\[[^\]]+\])\s*(.+)$')
        blank_line_re = re.compile(r'^\s*$')
        comment_re = re.compile(r'^(#|;)')
        inline_comment_re = re.compile(r' ;')

        def newlines(match):
            return '__BLANK%d__ =' % next(counter)

        def comments(match):
            if match.group(1) == '#':
                return '__HASH%d__ =' % next(counter)
            elif match.group(1) == ';':
                return '__SEMICOLON%d__ =' % next(counter)

        def inlinecomments(match):
            return '\n__INLINE%d__ =' % next(counter)

        def sections(match):
            return '%s\n__SECTION%d__ = %s' % (
                match.group(1), next(counter), match.group(2))

        for line in config_string.splitlines():
            line = blank_line_re.sub(newlines, line)
            line = section_re.sub(sections, line)
            line = comment_re.sub(comments, line)
            line = inline_comment_re.sub(inlinecomments, line)
            results.append(line)
        return '\n'.join(results)

    def _postprocess(config_string):
        """Converts a preprocessed config back to original form."""
        flags = re.IGNORECASE | re.MULTILINE
        result = re.sub(r'^\[__COMMENTS__\](\n|$)', '', config_string, flags=flags)
        result = re.sub(r'\n__INLINE\d+__ =(.*)$', ' ;\g<1>', result, flags=flags)
        result = re.sub(r'^__HASH\d+__ =(.*)$', '#\g<1>', result, flags=flags)
        result = re.sub(r'^__SEMICOLON\d+__ =(.*)$', ';\g<1>', result, flags=flags)
        result = re.sub(r'\n__SECTION\d+__ =(.*)$', '\g<1>', result, flags=flags)
        result = re.sub(r'^__BLANK\d+__ =$', '', result, flags=flags)
        return result

    class Proxy(collections.Mapping):
        def __init__(self, data):
            self._data = data

        def __getitem__(self, key):
            item = self._data.__getitem__(key)
            if isinstance(item, dict):
                return Proxy(item)
            return item

        def __iter__(self):
            return self._data.__iter__()

        def __len__(self):
            return self._data.__len__()

        def __repr__(self):
            return b'Proxy(%r)' % self._data

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