# Authors:
#   Rob Crittenden <rcritten@redhat.com>
#
# Copyright (C) 2010  Red Hat
# see file 'COPYING' for use and warranty information
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

from ipalib import _, ngettext
from ipalib import Str
from ipalib import api, crud, errors
from ipalib import output
from ipalib import Object
from ipalib.plugable import Registry
from .baseldap import gen_pkey_only_option, pkey_to_value

__doc__ = _("""
Self-service Permissions

A permission enables fine-grained delegation of permissions. Access Control
Rules, or instructions (ACIs), grant permission to permissions to perform
given tasks such as adding a user, modifying a group, etc.

A Self-service permission defines what an object can change in its own entry.


EXAMPLES:

 Add a self-service rule to allow users to manage their address (using Bash
 brace expansion):
   ipa selfservice-add --permissions=write --attrs={street,postalCode,l,c,st} "Users manage their own address"

 When managing the list of attributes you need to include all attributes
 in the list, including existing ones.
 Add telephoneNumber to the list (using Bash brace expansion):
   ipa selfservice-mod --attrs={street,postalCode,l,c,st,telephoneNumber} "Users manage their own address"

 Display our updated rule:
   ipa selfservice-show "Users manage their own address"

 Delete a rule:
   ipa selfservice-del "Users manage their own address"
""")

register = Registry()

ACI_PREFIX=u"selfservice"


@register()
class selfservice(Object):
    """
    Selfservice object.
    """

    bindable = False
    object_name = _('self service permission')
    object_name_plural = _('self service permissions')
    label = _('Self Service Permissions')
    label_singular = _('Self Service Permission')

    takes_params = (
        Str('aciname',
            cli_name='name',
            label=_('Self-service name'),
            doc=_('Self-service name'),
            primary_key=True,
            pattern='^[-_ a-zA-Z0-9]+$',
            pattern_errmsg="May only contain letters, numbers, -, _, and space",
        ),
        Str('permissions*',
            cli_name='permissions',
            label=_('Permissions'),
            doc=_('Permissions to grant (read, write). Default is write.'),
        ),
        Str('attrs+',
            cli_name='attrs',
            label=_('Attributes'),
            doc=_('Attributes to which the permission applies.'),
            normalizer=lambda value: value.lower(),
        ),
        Str('aci',
            label=_('ACI'),
            flags={'no_create', 'no_update', 'no_search'},
        ),
    )

    def __json__(self):
        json_friendly_attributes = (
            'label', 'label_singular', 'takes_params', 'bindable', 'name',
            'object_name', 'object_name_plural',
        )
        json_dict = dict(
            (a, getattr(self, a)) for a in json_friendly_attributes
        )
        json_dict['primary_key'] = self.primary_key.name
        json_dict['methods'] = [m for m in self.methods]
        return json_dict

    def postprocess_result(self, result):
        try:
            # do not include prefix in result
            del result['aciprefix']
        except KeyError:
            pass



@register()
class selfservice_add(crud.Create):
    __doc__ = _('Add a new self-service permission.')

    msg_summary = _('Added selfservice "%(value)s"')

    def execute(self, aciname, **kw):
        if 'permissions' not in kw:
            kw['permissions'] = (u'write',)
        kw['selfaci'] = True
        kw['aciprefix'] = ACI_PREFIX
        result = api.Command['aci_add'](aciname, **kw)['result']
        self.obj.postprocess_result(result)

        return dict(
            result=result,
            value=pkey_to_value(aciname, kw),
        )



@register()
class selfservice_del(crud.Delete):
    __doc__ = _('Delete a self-service permission.')

    has_output = output.standard_boolean
    msg_summary = _('Deleted selfservice "%(value)s"')

    def execute(self, aciname, **kw):
        result = api.Command['aci_del'](aciname, aciprefix=ACI_PREFIX)
        self.obj.postprocess_result(result)

        return dict(
            result=True,
            value=pkey_to_value(aciname, kw),
        )



@register()
class selfservice_mod(crud.Update):
    __doc__ = _('Modify a self-service permission.')

    msg_summary = _('Modified selfservice "%(value)s"')

    def execute(self, aciname, **kw):
        if 'attrs' in kw and kw['attrs'] is None:
            raise errors.RequirementError(name='attrs')

        kw['aciprefix'] = ACI_PREFIX
        result = api.Command['aci_mod'](aciname, **kw)['result']
        self.obj.postprocess_result(result)

        return dict(
            result=result,
            value=pkey_to_value(aciname, kw),
        )



@register()
class selfservice_find(crud.Search):
    __doc__ = _('Search for a self-service permission.')

    msg_summary = ngettext(
        '%(count)d selfservice matched', '%(count)d selfservices matched', 0
    )

    takes_options = (gen_pkey_only_option("name"),)

    def execute(self, term=None, **kw):
        kw['selfaci'] = True
        kw['aciprefix'] = ACI_PREFIX
        result = api.Command['aci_find'](term, **kw)['result']

        for aci in result:
            self.obj.postprocess_result(aci)

        return dict(
            result=result,
            count=len(result),
            truncated=False,
        )



@register()
class selfservice_show(crud.Retrieve):
    __doc__ = _('Display information about a self-service permission.')

    def execute(self, aciname, **kw):
        result = api.Command['aci_show'](aciname, aciprefix=ACI_PREFIX, **kw)['result']
        self.obj.postprocess_result(result)
        return dict(
            result=result,
            value=pkey_to_value(aciname, kw),
        )
