# copyright 2003-2014 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr

#

# This file is part of CubicWeb.

#

# CubicWeb is free software: you can redistribute it and/or modify it under the

# terms of the GNU Lesser General Public License as published by the Free

# Software Foundation, either version 2.1 of the License, or (at your option)

# any later version.

#

# CubicWeb is distributed in the hope that it will be useful, but WITHOUT

# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more

# details.

#

# You should have received a copy of the GNU Lesser General Public License along

# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.

"""server.serverconfig definition"""

from __future__ import print_function

__docformat__ = "restructuredtext en"

import sys

from os.path import join, exists

from io import StringIO

import logilab.common.configuration as lgconfig

from logilab.common.decorators import cached

from cubicweb.toolsutils import read_config, restrict_perms_to_user

from cubicweb.cwconfig import CONFIGURATIONS, CubicWebConfiguration

from cubicweb.server import SOURCE_TYPES

USER_OPTIONS =  (

    ('login', {'type' : 'string',

               'default': 'admin',

               'help': "cubicweb manager account's login "

               '(this user will be created)',

               'level': 0,

               }),

    ('password', {'type' : 'password',

                  'default': lgconfig.REQUIRED,

                  'help': "cubicweb manager account's password",

                  'level': 0,

                  }),

    )

class SourceConfiguration(lgconfig.Configuration):

    def __init__(self, appconfig, options):

        self.appconfig = appconfig # has to be done before super call

        super(SourceConfiguration, self).__init__(options=options)

    # make Method('default_instance_id') usable in db option defs (in native.py)

    def default_instance_id(self):

        return self.appconfig.appid

    def input_option(self, option, optdict, inputlevel):

        try:

            dbdriver = self['db-driver']

        except lgconfig.OptionError:

            pass

        else:

            if dbdriver == 'sqlite':

                if option in ('db-user', 'db-password'):

                    return

                if option == 'db-name':

                    optdict = optdict.copy()

                    optdict['help'] = 'path to the sqlite database'

                    optdict['default'] = join(self.appconfig.appdatahome,

                                              self.appconfig.appid + '.sqlite')

        super(SourceConfiguration, self).input_option(option, optdict, inputlevel)

def ask_source_config(appconfig, type, inputlevel=0):

    options = SOURCE_TYPES[type].options

    sconfig = SourceConfiguration(appconfig, options=options)

    sconfig.input_config(inputlevel=inputlevel)

    return sconfig

def generate_source_config(sconfig, encoding=sys.stdin.encoding):

    """serialize a repository source configuration as text"""

    stream = StringIO()

    optsbysect = list(sconfig.options_by_section())

    assert len(optsbysect) == 1, (

        'all options for a source should be in the same group, got %s'

        % [x[0] for x in optsbysect])

    lgconfig.ini_format(stream, optsbysect[0][1], encoding)

    return stream.getvalue()

class ServerConfiguration(CubicWebConfiguration):

    """standalone RQL server"""

    name = 'repository'

    cubicweb_appobject_path = CubicWebConfiguration.cubicweb_appobject_path | set(['sobjects', 'hooks'])

    cube_appobject_path = CubicWebConfiguration.cube_appobject_path | set(['sobjects', 'hooks'])

    options = lgconfig.merge_options((

        # ctl configuration

        ('host',

         {'type' : 'string',

          'default': None,

          'help': 'host name if not correctly detectable through gethostname',

          'group': 'main', 'level': 1,

          }),

        ('pid-file',

         {'type' : 'string',

          'default': lgconfig.Method('default_pid_file'),

          'help': 'repository\'s pid file',

          'group': 'main', 'level': 2,

          }),

        ('uid',

         {'type' : 'string',

          'default': None,

          'help': 'if this option is set, use the specified user to start \

the repository rather than the user running the command',

          'group': 'main', 'level': (CubicWebConfiguration.mode == 'installed') and 0 or 1,

          }),

        ('cleanup-session-time',

         {'type' : 'time',

          'default': '24h',

          'help': 'duration of inactivity after which a session '

          'will be closed, to limit memory consumption (avoid sessions that '

          'never expire and cause memory leak when http-session-time is 0, or '

          'because of bad client that never closes their connection). '

          'So notice that even if http-session-time is 0 and the user don\'t '

          'close his browser, he will have to reauthenticate after this time '

          'of inactivity. Default to 24h.',

          'group': 'main', 'level': 3,

          }),

        ('connections-pool-size',

         {'type' : 'int',

          'default': 4,

          'help': 'size of the connections pool. Each source supporting multiple \

connections will have this number of opened connections.',

          'group': 'main', 'level': 3,

          }),

        ('rql-cache-size',

         {'type' : 'int',

          'default': 3000,

          'help': 'size of the parsed rql cache size.',

          'group': 'main', 'level': 3,

          }),

        ('undo-enabled',

         {'type' : 'yn', 'default': False,

          'help': 'enable undo support',

          'group': 'main', 'level': 3,

          }),

        ('keep-transaction-lifetime',

         {'type' : 'int', 'default': 7,

          'help': 'number of days during which transaction records should be \

kept (hence undoable).',

          'group': 'main', 'level': 3,

          }),

        ('multi-sources-etypes',

         {'type' : 'csv', 'default': (),

          'help': 'defines which entity types from this repository are used \

by some other instances. You should set this properly for these instances to \

detect updates / deletions.',

          'group': 'main', 'level': 3,

          }),

        ('delay-full-text-indexation',

         {'type' : 'yn', 'default': False,

          'help': 'When full text indexation of entity has a too important cost'

          ' to be done when entity are added/modified by users, activate this '

          'option and setup a job using cubicweb-ctl db-rebuild-fti on your '

          'system (using cron for instance).',

          'group': 'main', 'level': 3,

          }),

        # email configuration

        ('default-recipients-mode',

         {'type' : 'choice',

          'choices' : ('default-dest-addrs', 'users', 'none'),

          'default': 'default-dest-addrs',

          'help': 'when a notification should be sent with no specific rules \

to find recipients, recipients will be found according to this mode. Available \

modes are "default-dest-addrs" (emails specified in the configuration \

variable with the same name), "users" (every users which has activated \

account with an email set), "none" (no notification).',

          'group': 'email', 'level': 2,

          }),

        ('default-dest-addrs',

         {'type' : 'csv',

          'default': (),

          'help': 'comma separated list of email addresses that will be used \

as default recipient when an email is sent and the notification has no \

specific recipient rules.',

          'group': 'email', 'level': 2,

          }),

        ('supervising-addrs',

         {'type' : 'csv',

          'default': (),

          'help': 'comma separated list of email addresses that will be \

notified of every changes.',

          'group': 'email', 'level': 2,

          }),

         ('zmq-address-sub',

          {'type' : 'csv',

           'default' : (),

           'help': ('List of ZMQ addresses to subscribe to (requires pyzmq) '

                    '(of the form `tcp://<ipaddr>:<port>`)'),

           'group': 'zmq', 'level': 1,

           }),

         ('zmq-address-pub',

          {'type' : 'string',

           'default' : None,

           'help': ('ZMQ address to use for publishing (requires pyzmq) '

                    '(of the form `tcp://<ipaddr>:<port>`)'),

           'group': 'zmq', 'level': 1,

           }),

        ) + CubicWebConfiguration.options)

    # should we init the connections pool (eg connect to sources). This is

    # usually necessary...

    init_cnxset_pool = True

    # read the schema from the database

    read_instance_schema = True

    # set this to true to get a minimal repository, for instance to get cubes

    # information on commands such as i18ninstance, db-restore, etc...

    quick_start = False

    # check user's state at login time

    consider_user_state = True

    # should some hooks be deactivated during [pre|post]create script execution

    free_wheel = False

    # list of enables sources when sources restriction is necessary

    # (eg repository initialization at least)

    enabled_sources = None

    def bootstrap_cubes(self):

        from logilab.common.textutils import splitstrip

        for line in open(join(self.apphome, 'bootstrap_cubes')):

            line = line.strip()

            if not line or line.startswith('#'):

                continue

            self.init_cubes(self.expand_cubes(splitstrip(line)))

            break

        else:

            # no cubes

            self.init_cubes(())

    def write_bootstrap_cubes_file(self, cubes):

        stream = open(join(self.apphome, 'bootstrap_cubes'), 'w')

        stream.write('# this is a generated file only used for bootstraping\n')

        stream.write('# you should not have to edit this\n')

        stream.write('%s\n' % ','.join(cubes))

        stream.close()

    def sources_file(self):

        return join(self.apphome, 'sources')

    # this method has to be cached since when the server is running using a

    # restricted user, this user usually don't have access to the sources

    # configuration file (#16102)

    @cached

    def read_sources_file(self):

        """return a dictionary of values found in the sources file"""

        return read_config(self.sources_file(), raise_if_unreadable=True)

    @property

    def system_source_config(self):

        return self.read_sources_file()['system']

    @property

    def default_admin_config(self):

        return self.read_sources_file()['admin']

    def source_enabled(self, source):

        if self.sources_mode is not None:

            if 'migration' in self.sources_mode:

                assert len(self.sources_mode) == 1

                if source.connect_for_migration:

                    return True

                print('not connecting to source', source.uri, 'during migration')

                return False

            if 'all' in self.sources_mode:

                assert len(self.sources_mode) == 1

                return True

            return source.uri in self.sources_mode

        if self.quick_start:

            return source.uri == 'system'

        return (not source.disabled and (

            not self.enabled_sources or source.uri in self.enabled_sources))

    def write_sources_file(self, sourcescfg):

        """serialize repository'sources configuration into a INI like file"""

        sourcesfile = self.sources_file()

        if exists(sourcesfile):

            import shutil

            shutil.copy(sourcesfile, sourcesfile + '.bak')

        stream = open(sourcesfile, 'w')

        for section in ('admin', 'system'):

            sconfig = sourcescfg[section]

            if isinstance(sconfig, dict):

                # get a Configuration object

                assert section == 'system', '%r is not system' % section

                _sconfig = SourceConfiguration(

                    self, options=SOURCE_TYPES['native'].options)

                for attr, val in sconfig.items():

                    try:

                        _sconfig.set_option(attr, val)

                    except lgconfig.OptionError:

                        # skip adapter, may be present on pre 3.10 instances

                        if attr != 'adapter':

                            self.error('skip unknown option %s in sources file' % attr)

                sconfig = _sconfig

            stream.write('[%s]\n%s\n' % (section, generate_source_config(sconfig)))

        restrict_perms_to_user(sourcesfile)

    def load_schema(self, expand_cubes=False, **kwargs):

        from cubicweb.schema import CubicWebSchemaLoader

        if expand_cubes:

            # in case some new dependencies have been introduced, we have to

            # reinitialize cubes so the full filesystem schema is read

            origcubes = self.cubes()

            self._cubes = None

            self.init_cubes(self.expand_cubes(origcubes))

        schema = CubicWebSchemaLoader().load(self, **kwargs)

        if expand_cubes:

            # restore original value

            self._cubes = origcubes

        return schema

    def load_bootstrap_schema(self):

        from cubicweb.schema import BootstrapSchemaLoader

        schema = BootstrapSchemaLoader().load(self)

        schema.name = 'bootstrap'

        return schema

    sources_mode = None

    def set_sources_mode(self, sources):

        self.sources_mode = sources

    def migration_handler(self, schema=None, interactive=True,

                          cnx=None, repo=None, connect=True, verbosity=None):

        """return a migration handler instance"""

        from cubicweb.server.migractions import ServerMigrationHelper

        if verbosity is None:

            verbosity = getattr(self, 'verbosity', 0)

        return ServerMigrationHelper(self, schema, interactive=interactive,

                                     cnx=cnx, repo=repo, connect=connect,

                                     verbosity=verbosity)