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import os

from logging import getLogger

from collections import defaultdict

from ConfigParser import RawConfigParser, NoOptionError, NoSectionError, Error

from re import match

from kamaki.cli.errors import CLISyntaxError

from kamaki import __version__

try:

    from collections import OrderedDict

except ImportError:

    from kamaki.clients.utils.ordereddict import OrderedDict

class InvalidCloudNameError(Error):

    """A valid cloud name is accepted by this regex: ([@#$:-\w]+)"""

log = getLogger(__name__)

# Path to the file that stores the configuration

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

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

CLOUD_PREFIX = 'cloud'

# Name of a shell variable to bypass the CONFIG_PATH value

CONFIG_ENV = 'KAMAKI_CONFIG'

version = ''

for c in '%s' % __version__:

    if c not in '0.123456789':

        break

    version += c

HEADER = '# Kamaki configuration file v%s\n' % version

DEFAULTS = {

    'global': {

        'default_cloud': '',

        'colors': 'off',

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

        'log_token': 'off',

        'log_data': 'off',

        'max_threads': 7,

        'history_file': HISTORY_PATH,

        'user_cli': 'astakos',

        'file_cli': 'pithos',

        'server_cli': 'cyclades',

        'flavor_cli': 'cyclades',

        'network_cli': 'cyclades',

        'image_cli': 'image',

        'config_cli': 'config',

        'history_cli': 'history'

        #  Optional command specs:

        #  'livetest_cli': 'livetest',

        #  'astakos_cli': 'snf-astakos'

    },

    CLOUD_PREFIX:

    {

        #'default': {

        #    'url': '',

        #    'token': ''

        #    'pithos_type': 'object-store',

        #    'pithos_version': 'v1',

        #    'cyclades_type': 'compute',

        #    'cyclades_version': 'v2.0',

        #    'plankton_type': 'image',

        #    'plankton_version': '',

        #    'astakos_type': 'identity',

        #    'astakos_version': 'v2.0'

        #}

    }

}

class Config(RawConfigParser):

    def __init__(self, path=None, with_defaults=True):

        RawConfigParser.__init__(self, dict_type=OrderedDict)

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

        self._overrides = defaultdict(dict)

        if with_defaults:

            self._load_defaults()

        self.read(self.path)

        for section in self.sections():

            r = self._cloud_name(section)

            if r:

                for k, v in self.items(section):

                    self.set_cloud(r, k, v)

                self.remove_section(section)

    @staticmethod

    def _cloud_name(full_section_name):

        if not full_section_name.startswith(CLOUD_PREFIX + ' '):

            return None

        matcher = match(CLOUD_PREFIX + ' "([@#$:\-\w]+)"', full_section_name)

        if matcher:

            return matcher.groups()[0]

        else:

            icn = full_section_name[len(CLOUD_PREFIX) + 1:]

            raise InvalidCloudNameError('Invalid Cloud Name %s' % icn)

    def rescue_old_file(self):

        lost_terms = []

        global_terms = DEFAULTS['global'].keys()

        translations = dict(

            config=dict(serv='', cmd='config'),

            history=dict(serv='', cmd='history'),

            pithos=dict(serv='pithos', cmd='file'),

            file=dict(serv='pithos', cmd='file'),

            store=dict(serv='pithos', cmd='file'),

            storage=dict(serv='pithos', cmd='file'),

            image=dict(serv='plankton', cmd='image'),

            plankton=dict(serv='plankton', cmd='image'),

            compute=dict(serv='compute', cmd=''),

            cyclades=dict(serv='compute', cmd='server'),

            server=dict(serv='compute', cmd='server'),

            flavor=dict(serv='compute', cmd='flavor'),

            network=dict(serv='compute', cmd='network'),

            astakos=dict(serv='astakos', cmd='user'),

            user=dict(serv='astakos', cmd='user'),

        )

        self.set('global', 'default_' + CLOUD_PREFIX, 'default')

        for s in self.sections():

            if s in ('global'):

                # global.url, global.token -->

                # cloud.default.url, cloud.default.token

                for term in set(self.keys(s)).difference(global_terms):

                    if term not in ('url', 'token'):

                        lost_terms.append('%s.%s = %s' % (

                            s, term, self.get(s, term)))

                        self.remove_option(s, term)

                        continue

                    gval = self.get(s, term)

                    try:

                        cval = self.get_cloud('default', term)

                    except KeyError:

                        cval = ''

                    if gval and cval and (

                        gval.lower().strip('/') != cval.lower().strip('/')):

                            raise CLISyntaxError(

                                'Conflicting values for default %s' % term,

                                importance=2, details=[

                                    ' global.%s:  %s' % (term, gval),

                                    ' %s.default.%s:  %s' % (

                                        CLOUD_PREFIX, term, cval),

                                    'Please remove one of them manually:',

                                    ' /config delete global.%s' % term,

                                    ' or'

                                    ' /config delete %s.default.%s' % (

                                        CLOUD_PREFIX, term),

                                    'and try again'])

                    elif gval:

                        print('... rescue %s.%s => %s.default.%s' % (

                            s, term, CLOUD_PREFIX, term))

                        self.set_cloud('default', term, gval)

                    self.remove_option(s, term)

            # translation for <service> or <command> settings

            # <service> or <command group> settings --> translation --> global

            elif s in translations:

                if s in ('history',):

                    k = 'file'

                    v = self.get(s, k)

                    if v:

                        print('... rescue %s.%s => global.%s_%s' % (

                            s, k, s, k))

                        self.set('global', '%s_%s' % (s, k), v)

                        self.remove_option(s, k)

                trn = translations[s]

                for k, v in self.items(s, False):

                    if v and k in ('cli',):

                        print('... rescue %s.%s => global.%s_cli' % (

                            s, k, trn['cmd']))

                        self.set('global', '%s_cli' % trn['cmd'], v)

                    elif k in ('container',) and trn['serv'] in ('pithos',):

                        print('... rescue %s.%s => %s.default.pithos_%s' % (

                                    s, k, CLOUD_PREFIX, k))

                        self.set_cloud('default', 'pithos_%s' % k, v)

                    else:

                        lost_terms.append('%s.%s = %s' % (s, k, v))

                self.remove_section(s)

        #  self.pretty_print()

        return lost_terms

    def pretty_print(self):

        for s in self.sections():

            print s

            for k, v in self.items(s):

                if isinstance(v, dict):

                    print '\t', k, '=> {'

                    for ki, vi in v.items():

                        print '\t\t', ki, '=>', vi

                    print('\t}')

                else:

                    print '\t', k, '=>', v

    def guess_version(self):

        """

        :returns: (float) version of the config file or 0.0 if unrecognized

        """

        checker = Config(self.path, with_defaults=False)

        sections = checker.sections()

        log.warning('Config file heuristic 1: old global section ?')

        if 'global' in sections:

            if checker.get('global', 'url') or checker.get('global', 'token'):

                log.warning('..... config file has an old global section')

                return 0.8

        log.warning('........ nope')

        log.warning('Config file heuristic 2: Any cloud sections ?')

        if CLOUD_PREFIX in sections:

            for r in self.keys(CLOUD_PREFIX):

                log.warning('... found cloud "%s"' % r)

                return 0.9

        log.warning('........ nope')

        log.warning('All heuristics failed, cannot decide')

        return 0.9

    def get_cloud(self, cloud, option):

        """

        :param cloud: (str) cloud alias

        :param option: (str) option in cloud section

        :returns: (str) the value assigned on this option

        :raises KeyError: if cloud or cloud's option does not exist

        """

        r = self.get(CLOUD_PREFIX, cloud)

        if not r:

            raise KeyError('Cloud "%s" does not exist' % cloud)

        return r[option]

    def get_global(self, option):

        return self.get('global', option)

    def set_cloud(self, cloud, option, value):

        try:

            d = self.get(CLOUD_PREFIX, cloud) or dict()

        except KeyError:

            d = dict()

        d[option] = value

        self.set(CLOUD_PREFIX, cloud, d)

    def set_global(self, option, value):

        self.set('global', option, value)

    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):

        """

        :param section: (str) HINT: for clouds, use cloud.<section>

        :param option: (str)

        :returns: (str) the value stored at section: {option: value}

        """

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

        if value is not None:

            return value

        prefix = CLOUD_PREFIX + '.'

        if section.startswith(prefix):

            return self.get_cloud(section[len(prefix):], option)

        try:

            return RawConfigParser.get(self, section, option)

        except (NoSectionError, NoOptionError):

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

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

        """

        :param section: (str) HINT: for remotes use cloud.<section>

        :param option: (str)

        :param value: str

        """

        prefix = CLOUD_PREFIX + '.'

        if section.startswith(prefix):

            cloud = self._cloud_name(

                CLOUD_PREFIX + ' "' + section[len(prefix):] + '"')

            return self.set_cloud(cloud, 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 remote_from_cloud(self, cloud, option):

        d = self.get(CLOUD_PREFIX, cloud)

        if isinstance(d, dict):

            d.pop(option)

    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):

        cld_bu = self._get_dict(CLOUD_PREFIX)

        try:

            for r, d in self.items(CLOUD_PREFIX):

                for k, v in d.items():

                    self.set(CLOUD_PREFIX + ' "%s"' % r, k, v)

            self.remove_section(CLOUD_PREFIX)

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

                os.chmod(self.path, 0600)

                f.write(HEADER.lstrip())

                f.flush()

                RawConfigParser.write(self, f)

        finally:

            if CLOUD_PREFIX not in self.sections():

                self.add_section(CLOUD_PREFIX)

            for cloud, d in cld_bu.items():

                self.set(CLOUD_PREFIX, cloud, d)