# Copyright 2014 Huawei Technologies Co. Ltd
#
# 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.

"""UserLog database operations."""
import logging

from compass.db.api import database
from compass.db.api import user as user_api
from compass.db.api import utils
from compass.db import exception
from compass.db import models


SUPPORTED_FIELDS = ['user_email', 'timestamp']
USER_SUPPORTED_FIELDS = ['timestamp']
RESP_FIELDS = ['user_id', 'logs', 'timestamp']


@database.run_in_session()
def log_user_action(session, user_id, action):
    """Log user action."""
    utils.add_db_object(
        session, models.UserLog, True, user_id=user_id, action=action
    )


def _compress_response(actions, user_id):
    user_actions = []
    for action in actions:
        action_dict = action.to_dict()
        del action_dict['user_id']
        user_actions.append(action_dict)
    return {'user_id': user_id, 'logs': user_actions}


def _compress_response_by_user(actions):
    actions = {}
    for action in actions:
        action_dict = action.to_dict()
        user_id = action_dict['user_id']
        del action_dict['user_id']
        actions.setdefault(user_id, []).append(action_dict)

    return [
        {'user_id': user_id, 'logs': user_actions}
        for user_id, user_actions in actions.items()
    ]


@utils.supported_filters(optional_support_keys=USER_SUPPORTED_FIELDS)
@user_api.check_user_admin_or_owner()
@database.run_in_session()
@utils.wrap_to_dict(RESP_FIELDS)
def list_user_actions(session, lister, user_id, **filters):
    """list user actions."""
    return _compress_response(
        utils.list_db_objects(
            session, models.UserLog, user_id=user_id, **filters
        ),
        user_id
    )


@utils.supported_filters(optional_support_keys=SUPPORTED_FIELDS)
@user_api.check_user_admin()
@database.run_in_session()
@utils.wrap_to_dict(RESP_FIELDS)
def list_actions(session, lister, **filters):
    """list actions."""
    return _compress_response_by_user(
        utils.list_db_objects(
            session, models.UserLog, **filters
        )
    )


@utils.supported_filters(optional_support_keys=USER_SUPPORTED_FIELDS)
@user_api.check_user_admin_or_owner()
@database.run_in_session()
@utils.wrap_to_dict(RESP_FIELDS)
def del_user_actions(session, deleter, user_id, **filters):
    """delete user actions."""
    return _compress_response(
        utils.del_db_objects(
            session, models.UserLog, user_id=user_id, **filters
        ),
        user_id
    )


@utils.supported_filters(optional_support_keys=SUPPORTED_FIELDS)
@user_api.check_user_admin()
@database.run_in_session()
@utils.wrap_to_dict(RESP_FIELDS)
def del_actions(session, deleter, **filters):
    """delete actions."""
    return _compress_response_by_user(
        utils.del_db_objects(
            session, models.UserLog, **filters
        )
    )