# Copyright (c) 2017 Ericsson AB.
# All Rights Reserved.
#
#    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.
#
# Copyright (c) 2019 Wind River Systems, Inc.
#
# SPDX-License-Identifier: Apache-2.0
#

from oslo_config import cfg
from oslo_log import log as logging

import pecan
from pecan import expose
from pecan import request
from pecan import response

from dcdbsync.api.controllers import restcomm
from dcdbsync.common import exceptions
from dcdbsync.common.i18n import _
from dcdbsync.db.identity import api as db_api

import json

CONF = cfg.CONF
LOG = logging.getLogger(__name__)


class UsersController(object):
    VERSION_ALIASES = {
        'Pike': '1.0',
    }

    def __init__(self):
        super(UsersController, self).__init__()

    # to do the version compatibility for future purpose
    def _determine_version_cap(self, target):
        version_cap = 1.0
        return version_cap

    @expose(generic=True, template='json')
    def index(self):
        # Route the request to specific methods with parameters
        pass

    @index.when(method='GET', template='json')
    def get(self, user_ref=None):
        """Get a list of users."""
        context = restcomm.extract_context_from_environ()
        try:
            if user_ref is None:
                return db_api.user_get_all(context)

            else:
                user = db_api.user_get(context, user_ref)
                return user

        except exceptions.UserNotFound as e:
            pecan.abort(404, _("User not found: %s") % e)

        except Exception as e:
            LOG.exception(e)
            pecan.abort(500, _('Unable to get user'))

    @index.when(method='POST', template='json')
    def post(self):
        """Create a new user."""

        context = restcomm.extract_context_from_environ()

        # Convert JSON string in request to Python dict
        try:
            payload = json.loads(request.body)
        except ValueError:
            pecan.abort(400, _('Request body decoding error'))

        if not payload:
            pecan.abort(400, _('Body required'))
        user_name = payload.get('local_user').get('name')

        if not user_name:
            pecan.abort(400, _('User name required'))

        try:
            # Insert the user into DB tables
            user_ref = db_api.user_create(context, payload)
            response.status = 201
            return (user_ref)

        except Exception as e:
            LOG.exception(e)
            pecan.abort(500, _('Unable to create user'))

    @index.when(method='PUT', template='json')
    def put(self, user_ref=None):
        """Update a existing user."""

        context = restcomm.extract_context_from_environ()

        if user_ref is None:
            pecan.abort(400, _('User ID required'))

        # Convert JSON string in request to Python dict
        try:
            payload = json.loads(request.body)
        except ValueError:
            pecan.abort(400, _('Request body decoding error'))

        if not payload:
            pecan.abort(400, _('Body required'))

        try:
            # Update the user in DB tables
            return db_api.user_update(context, user_ref, payload)

        except exceptions.UserNotFound as e:
            pecan.abort(404, _("User not found: %s") % e)

        except Exception as e:
            LOG.exception(e)
            pecan.abort(500, _('Unable to update user'))