"""server.serverconfig definition

:organization: Logilab

:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.

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

:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses

"""

__docformat__ = "restructuredtext en"

from os.path import join, exists

from logilab.common.configuration import REQUIRED, Method, Configuration, \

     ini_format_section

from logilab.common.decorators import wproperty, cached, clear_cache

from cubicweb.toolsutils import read_config, restrict_perms_to_user

from cubicweb.cwconfig import CubicWebConfiguration, merge_options

from cubicweb.server import SOURCE_TYPES

USER_OPTIONS =  (

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

               'default': 'admin',

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

               '(this user will be created)',

               'inputlevel': 0,

               }),

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

                  'default': REQUIRED,

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

                  'inputlevel': 0,

                  }),

    )

class SourceConfiguration(Configuration):

    def __init__(self, appid, options):

        self.appid = appid # 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.appid

def generate_sources_file(appid, sourcesfile, sourcescfg, keys=None):

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

    the `keys` parameter may be used to sort sections

    """

    if keys is None:

        keys = sourcescfg.keys()

    else:

        for key in sourcescfg:

            if not key in keys:

                keys.append(key)

    stream = open(sourcesfile, 'w')

    for uri in keys:

        sconfig = sourcescfg[uri]

        if isinstance(sconfig, dict):

            # get a Configuration object

            if uri == 'admin':

                options = USER_OPTIONS

            else:

                options = SOURCE_TYPES[sconfig['adapter']].options

            _sconfig = SourceConfiguration(appid, options=options)

            for attr, val in sconfig.items():

                if attr == 'uri':

                    continue

                if attr == 'adapter':

                    _sconfig.adapter = val

                else:

                    _sconfig.set_option(attr, val)

            sconfig = _sconfig

        optsbysect = list(sconfig.options_by_section())

        assert len(optsbysect) == 1, 'all options for a source should be in the same group'

        ini_format_section(stream, uri, optsbysect[0][1])

        if hasattr(sconfig, 'adapter'):

            print >> stream

            print >> stream, '# adapter for this source (YOU SHOULD NOT CHANGE THIS)'

            print >> stream, 'adapter=%s' % sconfig.adapter

        print >> stream

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 = merge_options((

        # ctl configuration

        ('host',

         {'type' : 'string',

          'default': None,

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

          'group': 'main', 'inputlevel': 1,

          }),

        ('pid-file',

         {'type' : 'string',

          'default': Method('default_pid_file'),

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

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

          }),

        ('session-time',

         {'type' : 'int',

          'default': 30*60,

          'help': 'session expiration time, default to 30 minutes',

          'group': 'main', 'inputlevel': 1,

          }),

        ('connections-pool-size',

         {'type' : 'int',

          'default': 4,

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

connections will have this number of opened connections.',

          'group': 'main', 'inputlevel': 1,

          }),

        ('rql-cache-size',

         {'type' : 'int',

          'default': 300,

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

          'group': 'main', 'inputlevel': 1,

          }),

        ('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', 'inputlevel': 1,

          }),

        # 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', 'inputlevel': 1,

          }),

        ('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', 'inputlevel': 1,

          }),

        ('supervising-addrs',

         {'type' : 'csv',

          'default': (),

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

notified of every changes.',

          'group': 'email', 'inputlevel': 2,

          }),

        # pyro server.serverconfig

        ('pyro-host',

         {'type' : 'string',

          'default': None,

          'help': 'Pyro server host, if not detectable correctly through \

gethostname(). It may contains port information using <host>:<port> notation, \

and if not set, it will be choosen randomly',

          'group': 'pyro', 'inputlevel': 2,

          }),

        ) + CubicWebConfiguration.options)

    # should we open connections pools (eg connect to sources). This is usually

    # necessary...

    open_connections_pools = True

    # read the schema from the database

    read_instance_schema = True

    bootstrap_schema = True

    # check user's state at login time

    consider_user_state = True

    # XXX hooks control stuff should probably be on the session, not on the config

    # hooks activation configuration

    # all hooks should be activated during normal execution

    disabled_hooks_categories = set()

    enabled_hooks_categories = set()

    ALLOW_ALL = object()

    DENY_ALL = object()

    hooks_mode = ALLOW_ALL

    @classmethod

    def set_hooks_mode(cls, mode):

        assert mode is cls.ALLOW_ALL or mode is cls.DENY_ALL

        oldmode = cls.hooks_mode

        cls.hooks_mode = mode

        return oldmode

    @classmethod

    def disable_hook_category(cls, *categories):

        changes = set()

        if cls.hooks_mode is cls.DENY_ALL:

            for category in categories:

                if category in cls.enabled_hooks_categories:

                    cls.enabled_hooks_categories.remove(category)

                    changes.add(category)

        else:

            for category in categories:

                if category not in cls.disabled_hooks_categories:

                    cls.disabled_hooks_categories.add(category)

                    changes.add(category)

        return changes

    @classmethod

    def enable_hook_category(cls, *categories):

        changes = set()

        if cls.hooks_mode is cls.DENY_ALL:

            for category in categories:

                if category not in cls.enabled_hooks_categories:

                    cls.enabled_hooks_categories.add(category)

                    changes.add(category)

        else:

            for category in categories:

                if category in cls.disabled_hooks_categories:

                    cls.disabled_hooks_categories.remove(category)

                    changes.add(category)

        return changes

    @classmethod

    def is_hook_activated(cls, hook):

        return cls.is_hook_category_activated(hook.category)

    @classmethod

    def is_hook_category_activated(cls, category):

        if cls.hooks_mode is cls.DENY_ALL:

            return category in cls.enabled_hooks_categories

        return category not in cls.disabled_hooks_categories

    # 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

    @wproperty

    def enabled_sources(self, sourceuris=None):

        self._enabled_sources = sourceuris

        clear_cache(self, 'sources')

    def bootstrap_cubes(self):

        from logilab.common.textutils import splitstrip

        for line in file(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 = file(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 read_config(self.sources_file())

    def sources(self):

        """return a dictionnaries containing sources definitions indexed by

        sources'uri

        """

        allsources = self.read_sources_file()

        if self._enabled_sources is None:

            return allsources

        return dict((uri, config) for uri, config in allsources.items()

                    if uri in self._enabled_sources or uri == 'admin')

    def write_sources_file(self, sourcescfg):

        sourcesfile = self.sources_file()

        if exists(sourcesfile):

            import shutil

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

        generate_sources_file(self.appid, sourcesfile, sourcescfg,

                              ['admin', 'system'])

        restrict_perms_to_user(sourcesfile)

    def pyro_enabled(self):

        """pyro is always enabled in standalone repository configuration"""

        return True

    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:

            # restaure 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

    def set_sources_mode(self, sources):

        if 'migration' in sources:

            from cubicweb.server.sources import source_adapter

            assert len(sources) == 1

            enabled_sources = []

            for uri, config in self.sources().iteritems():

                if uri == 'admin':

                    continue

                if source_adapter(config).connect_for_migration:

                    enabled_sources.append(uri)

                else:

                    print 'not connecting to source', uri, 'during migration'

        elif 'all' in sources:

            assert len(sources) == 1

            enabled_sources = None

        else:

            known_sources = self.sources()

            for uri in sources:

                assert uri in known_sources, uri

            enabled_sources = sources

        self._enabled_sources = enabled_sources

        clear_cache(self, '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)