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# Copyright 2011-2012 GRNET S.A. All rights reserved.

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# without modification, are permitted provided that the following

# conditions are met:

#

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#      copyright notice, this list of conditions and the following

#      disclaimer.

#

#   2. Redistributions in binary form must reproduce the above

#      copyright notice, this list of conditions and the following

#      disclaimer in the documentation and/or other materials

#      provided with the distribution.

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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

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import os

from collections import defaultdict

from ConfigParser import RawConfigParser, NoOptionError, NoSectionError

try:

    from collections import OrderedDict

except ImportError:

    from kamaki.clients.utils.ordereddict import OrderedDict

# Path to the file that stores the configuration

CONFIG_PATH = os.path.expanduser('~/.kamakirc')

HISTORY_PATH = os.path.expanduser('~/.kamaki.history')

# Name of a shell variable to bypass the CONFIG_PATH value

CONFIG_ENV = 'KAMAKI_CONFIG'

HEADER = """

# Kamaki configuration file v3

"""

DEFAULTS = {

    'global': {

        'colors': 'off',

        'token': '',

        'log_file': os.path.expanduser('~/.kamaki.log'),

        'log_token': 'off',

        'log_data': 'off',

        'max_threads': 7,

        'url': 'https://accounts.okeanos.grnet.gr/astakos/identity/v2.0/'

    },

    'cli': {

        'user': 'astakos',

        'file': 'pithos',

        'server': 'cyclades',

        'flavor': 'cyclades',

        'network': 'cyclades',

        'image': 'image',

        'config': 'config',

        'history': 'history'

    },

    'history': {

        'file': HISTORY_PATH

    },

    'pithos': {

        'type': 'object-store',

        'version': 'v1'

    },

    'cyclades': {

        'type': 'compute',

        'version': 'v2.0'

        },

    'image': {

        'type': 'image',

        'version': ''

    },

    'astakos': {

        'type': 'identity',

        'version': 'v2.0'

    }

}

class Config(RawConfigParser):

    def __init__(self, path=None):

        RawConfigParser.__init__(self, dict_type=OrderedDict)

        self.path = path or os.environ.get(CONFIG_ENV, CONFIG_PATH)

        self._overrides = defaultdict(dict)

        self._load_defaults()

        self.read(self.path)

    def _load_defaults(self):

        for section, options in DEFAULTS.items():

            for option, val in options.items():

                self.set(section, option, val)

    def _get_dict(self, section, include_defaults=True):

        try:

            d = dict(DEFAULTS[section]) if include_defaults else {}

        except KeyError:

            d = {}

        try:

            d.update(RawConfigParser.items(self, section))

        except NoSectionError:

            pass

        return d

    def reload(self):

        self = self.__init__(self.path)

    def get(self, section, option):

        value = self._overrides.get(section, {}).get(option)

        if value is not None:

            return value

        try:

            return RawConfigParser.get(self, section, option)

        except (NoSectionError, NoOptionError):

            return DEFAULTS.get(section, {}).get(option)

    def set(self, section, option, value):

        if section not in RawConfigParser.sections(self):

            self.add_section(section)

        RawConfigParser.set(self, section, option, value)

    def remove_option(self, section, option, also_remove_default=False):

        try:

            if also_remove_default:

                DEFAULTS[section].pop(option)

            RawConfigParser.remove_option(self, section, option)

        except NoSectionError:

            pass

    def keys(self, section, include_defaults=True):

        d = self._get_dict(section, include_defaults)

        return d.keys()

    def items(self, section, include_defaults=True):

        d = self._get_dict(section, include_defaults)

        return d.items()

    def override(self, section, option, value):

        self._overrides[section][option] = value

    def write(self):

        with open(self.path, 'w') as f:

            os.chmod(self.path, 0600)

            f.write(HEADER.lstrip())

            f.flush()

            RawConfigParser.write(self, f)