#   Copyright 2012-2013 OpenStack Foundation
#
#   Licensed under the Apache License, Version 2.0 (the "License"); you may
#   not use this file except in compliance with the License. You may obtain
#   a copy of the License at
#
#        http://www.apache.org/licenses/LICENSE-2.0
#
#   Unless required by applicable law or agreed to in writing, software
#   distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#   WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#   License for the specific language governing permissions and limitations
#   under the License.
#

"""Identity v2.0 User action implementations"""

import functools
import logging

from cliff import columns as cliff_columns
from keystoneauth1 import exceptions as ks_exc
from osc_lib.command import command
from osc_lib import exceptions
from osc_lib import utils

from openstackclient.i18n import _


LOG = logging.getLogger(__name__)


class ProjectColumn(cliff_columns.FormattableColumn):
    """Formattable column for project column.

    Unlike the parent FormattableColumn class, the initializer of the
    class takes project_cache as the second argument.
    osc_lib.utils.get_item_properties instantiate cliff FormattableColumn
    object with a single parameter "column value", so you need to pass
    a partially initialized class like
    ``functools.partial(ProjectColumn, project_cache)``.
    """

    def __init__(self, value, project_cache=None):
        super(ProjectColumn, self).__init__(value)
        self.project_cache = project_cache or {}

    def human_readable(self):
        project = self._value
        if not project:
            return ""
        if project in self.project_cache.keys():
            return self.project_cache[project].name
        else:
            return project


class CreateUser(command.ShowOne):
    _description = _("Create new user")

    def get_parser(self, prog_name):
        parser = super(CreateUser, self).get_parser(prog_name)
        parser.add_argument(
            'name',
            metavar='<name>',
            help=_('New user name'),
        )
        parser.add_argument(
            '--project',
            metavar='<project>',
            help=_('Default project (name or ID)'),
        )
        parser.add_argument(
            '--password',
            metavar='<password>',
            help=_('Set user password'),
        )
        parser.add_argument(
            '--password-prompt',
            dest="password_prompt",
            action="store_true",
            help=_('Prompt interactively for password'),
        )
        parser.add_argument(
            '--email',
            metavar='<email-address>',
            help=_('Set user email address'),
        )
        enable_group = parser.add_mutually_exclusive_group()
        enable_group.add_argument(
            '--enable',
            action='store_true',
            help=_('Enable user (default)'),
        )
        enable_group.add_argument(
            '--disable',
            action='store_true',
            help=_('Disable user'),
        )
        parser.add_argument(
            '--or-show',
            action='store_true',
            help=_('Return existing user'),
        )
        return parser

    def take_action(self, parsed_args):
        identity_client = self.app.client_manager.identity

        if parsed_args.project:
            project_id = utils.find_resource(
                identity_client.tenants,
                parsed_args.project,
            ).id
        else:
            project_id = None

        enabled = True
        if parsed_args.disable:
            enabled = False
        if parsed_args.password_prompt:
            parsed_args.password = utils.get_password(self.app.stdin)

        if not parsed_args.password:
            LOG.warning(_("No password was supplied, authentication will fail "
                          "when a user does not have a password."))

        try:
            user = identity_client.users.create(
                parsed_args.name,
                parsed_args.password,
                parsed_args.email,
                tenant_id=project_id,
                enabled=enabled,
            )
        except ks_exc.Conflict:
            if parsed_args.or_show:
                user = utils.find_resource(
                    identity_client.users,
                    parsed_args.name,
                )
                LOG.info(_('Returning existing user %s'), user.name)
            else:
                raise

        # NOTE(dtroyer): The users.create() method wants 'tenant_id' but
        #                the returned resource has 'tenantId'.  Sigh.
        #                We're using project_id now inside OSC so there.
        if 'tenantId' in user._info:
            user._info.update(
                {'project_id': user._info.pop('tenantId')}
            )

        info = {}
        info.update(user._info)
        return zip(*sorted(info.items()))


class DeleteUser(command.Command):
    _description = _("Delete user(s)")

    def get_parser(self, prog_name):
        parser = super(DeleteUser, self).get_parser(prog_name)
        parser.add_argument(
            'users',
            metavar='<user>',
            nargs="+",
            help=_('User(s) to delete (name or ID)'),
        )
        return parser

    def take_action(self, parsed_args):
        identity_client = self.app.client_manager.identity

        errors = 0
        for user in parsed_args.users:
            try:
                user_obj = utils.find_resource(
                    identity_client.users,
                    user,
                )
                identity_client.users.delete(user_obj.id)
            except Exception as e:
                errors += 1
                LOG.error(_("Failed to delete user with "
                          "name or ID '%(user)s': %(e)s"),
                          {'user': user, 'e': e})

        if errors > 0:
            total = len(parsed_args.users)
            msg = (_("%(errors)s of %(total)s users failed "
                   "to delete.") % {'errors': errors, 'total': total})
            raise exceptions.CommandError(msg)


class ListUser(command.Lister):
    _description = _("List users")

    def get_parser(self, prog_name):
        parser = super(ListUser, self).get_parser(prog_name)
        parser.add_argument(
            '--project',
            metavar='<project>',
            help=_('Filter users by project (name or ID)'),
        )
        parser.add_argument(
            '--long',
            action='store_true',
            default=False,
            help=_('List additional fields in output'),
        )
        return parser

    def take_action(self, parsed_args):
        identity_client = self.app.client_manager.identity
        formatters = {}
        project = None
        if parsed_args.project:
            project = utils.find_resource(
                identity_client.tenants,
                parsed_args.project,
            )
            project = project.id

        if parsed_args.long:
            columns = (
                'ID',
                'Name',
                'tenantId',
                'Email',
                'Enabled',
            )
            column_headers = (
                'ID',
                'Name',
                'Project',
                'Email',
                'Enabled',
            )
            # Cache the project list
            project_cache = {}
            try:
                for p in identity_client.tenants.list():
                    project_cache[p.id] = p
            except Exception:
                # Just forget it if there's any trouble
                pass
            formatters['tenantId'] = functools.partial(
                ProjectColumn, project_cache=project_cache)
        else:
            columns = column_headers = ('ID', 'Name')
        data = identity_client.users.list(tenant_id=project)

        if parsed_args.project:
            d = {}
            for s in data:
                d[s.id] = s
            data = d.values()

        if parsed_args.long:
            # FIXME(dtroyer): Sometimes user objects have 'tenant_id' instead
            #                 of 'tenantId'.  Why?  Dunno yet, but until that
            #                 is fixed we need to handle it; auth_token.py
            #                 only looks for 'tenantId'.
            for d in data:
                if 'tenant_id' in d._info:
                    d._info['tenantId'] = d._info.pop('tenant_id')
                    d._add_details(d._info)

        return (column_headers,
                (utils.get_item_properties(
                    s, columns,
                    mixed_case_fields=('tenantId',),
                    formatters=formatters,
                ) for s in data))


class SetUser(command.Command):
    _description = _("Set user properties")

    def get_parser(self, prog_name):
        parser = super(SetUser, self).get_parser(prog_name)
        parser.add_argument(
            'user',
            metavar='<user>',
            help=_('User to modify (name or ID)'),
        )
        parser.add_argument(
            '--name',
            metavar='<name>',
            help=_('Set user name'),
        )
        parser.add_argument(
            '--project',
            metavar='<project>',
            help=_('Set default project (name or ID)'),
        )
        parser.add_argument(
            '--password',
            metavar='<user-password>',
            help=_('Set user password'),
        )
        parser.add_argument(
            '--password-prompt',
            dest="password_prompt",
            action="store_true",
            help=_('Prompt interactively for password'),
        )
        parser.add_argument(
            '--email',
            metavar='<email-address>',
            help=_('Set user email address'),
        )
        enable_group = parser.add_mutually_exclusive_group()
        enable_group.add_argument(
            '--enable',
            action='store_true',
            help=_('Enable user (default)'),
        )
        enable_group.add_argument(
            '--disable',
            action='store_true',
            help=_('Disable user'),
        )
        return parser

    def take_action(self, parsed_args):
        identity_client = self.app.client_manager.identity

        if parsed_args.password_prompt:
            parsed_args.password = utils.get_password(self.app.stdin)

        if '' == parsed_args.password:
            LOG.warning(_("No password was supplied, authentication will fail "
                          "when a user does not have a password."))

        user = utils.find_resource(
            identity_client.users,
            parsed_args.user,
        )

        if parsed_args.password:
            identity_client.users.update_password(
                user.id,
                parsed_args.password,
            )

        if parsed_args.project:
            project = utils.find_resource(
                identity_client.tenants,
                parsed_args.project,
            )
            identity_client.users.update_tenant(
                user.id,
                project.id,
            )

        kwargs = {}
        if parsed_args.name:
            kwargs['name'] = parsed_args.name
        if parsed_args.email:
            kwargs['email'] = parsed_args.email
        kwargs['enabled'] = user.enabled
        if parsed_args.enable:
            kwargs['enabled'] = True
        if parsed_args.disable:
            kwargs['enabled'] = False

        identity_client.users.update(user.id, **kwargs)


class ShowUser(command.ShowOne):
    _description = _("Display user details")

    def get_parser(self, prog_name):
        parser = super(ShowUser, self).get_parser(prog_name)
        parser.add_argument(
            'user',
            metavar='<user>',
            help=_('User to display (name or ID)'),
        )
        return parser

    def take_action(self, parsed_args):
        identity_client = self.app.client_manager.identity

        info = {}
        try:
            user = utils.find_resource(
                identity_client.users,
                parsed_args.user,
            )
            info.update(user._info)
        except ks_exc.Forbidden:
            auth_ref = self.app.client_manager.auth_ref
            if (
                parsed_args.user == auth_ref.user_id or
                parsed_args.user == auth_ref.username
            ):
                # Ask for currently auth'ed project so return it
                info = {
                    'id': auth_ref.user_id,
                    'name': auth_ref.username,
                    'project_id': auth_ref.project_id,
                    # True because we don't get this far if it is disabled
                    'enabled': True,
                }
            else:
                raise

        if 'tenantId' in info:
            info.update(
                {'project_id': info.pop('tenantId')}
            )
        if 'tenant_id' in info:
            info.update(
                {'project_id': info.pop('tenant_id')}
            )

        return zip(*sorted(info.items()))
