#   Copyright 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.
#

"""Usage action implementations"""

import datetime
import logging

from cliff import lister

from openstackclient.common import utils


class ListUsage(lister.Lister):
    """List resource usage per project. """

    log = logging.getLogger(__name__ + ".ListUsage")

    def get_parser(self, prog_name):
        parser = super(ListUsage, self).get_parser(prog_name)
        parser.add_argument(
            "--start",
            metavar="<start>",
            default=None,
            help="Usage range start date ex 2012-01-20"
                " (default: 4 weeks ago)."
        )
        parser.add_argument(
            "--end",
            metavar="<end>",
            default=None,
            help="Usage range end date, ex 2012-01-20 (default: tomorrow)"
        )
        return parser

    def take_action(self, parsed_args):
        self.log.debug("take_action(%s)" % parsed_args)
        compute_client = self.app.client_manager.compute
        columns = (
            "tenant_id",
            "total_memory_mb_usage",
            "total_vcpus_usage",
            "total_local_gb_usage"
        )
        column_headers = (
            "Project ID",
            "RAM MB-Hours",
            "CPU Hours",
            "Disk GB-Hours"
        )

        dateformat = "%Y-%m-%d"
        now = datetime.datetime.utcnow()

        if parsed_args.start:
            start = datetime.datetime.strptime(parsed_args.start, dateformat)
        else:
            start = now - datetime.timedelta(weeks=4)

        if parsed_args.end:
            end = datetime.datetime.strptime(parsed_args.end, dateformat)
        else:
            end = now + datetime.timedelta(days=1)

        usage_list = compute_client.usage.list(start, end)

        if len(usage_list) > 0:
            print("Usage from %s to %s:" % (start.strftime(dateformat),
                                            end.strftime(dateformat)))

        return (column_headers,
                (utils.get_item_properties(
                    s, columns,
                    formatters={
                        'total_memory_mb_usage': lambda x: float("%.2f" % x),
                        'total_vcpus_usage': lambda x: float("%.2f" % x),
                        'total_local_gb_usage': lambda x: float("%.2f" % x),
                    },
                ) for s in usage_list))