#!/usr/bin/env python
#
# 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.

"""Command line tool for creating event test data for Ceilometer.

Usage:

Generate testing data for e.g. for default time span

source .tox/py27/bin/activate
./tools/make_test_event_data.py --event_types 3
"""
from __future__ import print_function

import argparse
import datetime
import logging
import random
import sys
import uuid

from oslo.config import cfg
from oslo.utils import timeutils

from ceilometer.event.storage import models
from ceilometer import storage


def make_test_data(conn, start, end, interval, event_types):

    # Compute start and end timestamps for the new data.
    if isinstance(start, datetime.datetime):
        timestamp = start
    else:
        timestamp = timeutils.parse_strtime(start)

    if not isinstance(end, datetime.datetime):
        end = timeutils.parse_strtime(end)

    increment = datetime.timedelta(minutes=interval)

    print('Adding new events')
    n = 0
    while timestamp <= end:
        data = []
        for i in range(event_types):
            traits = [models.Trait('id1_%d' % i, 1, str(uuid.uuid4())),
                      models.Trait('id2_%d' % i, 2, random.randint(1, 10)),
                      models.Trait('id3_%d' % i, 3, random.random()),
                      models.Trait('id4_%d' % i, 4, timestamp)]
            data.append(models.Event(str(uuid.uuid4()),
                                     'event_type%d' % i,
                                     timestamp,
                                     traits))
            n += 1
        conn.record_events(data)
        timestamp = timestamp + increment
    print('Added %d new events' % n)


def main():
    cfg.CONF([], project='ceilometer')

    parser = argparse.ArgumentParser(
        description='generate event data',
    )
    parser.add_argument(
        '--interval',
        default=10,
        type=int,
        help='The period between events, in minutes.',
    )
    parser.add_argument(
        '--start',
        default=31,
        type=int,
        help='The number of days in the past to start timestamps.',
    )
    parser.add_argument(
        '--end',
        default=2,
        type=int,
        help='The number of days into the future to continue timestamps.',
    )
    parser.add_argument(
        '--event_types',
        default=3,
        type=int,
        help='The number of unique event_types.',
    )
    args = parser.parse_args()

    # Set up logging to use the console
    console = logging.StreamHandler(sys.stderr)
    console.setLevel(logging.DEBUG)
    formatter = logging.Formatter('%(message)s')
    console.setFormatter(formatter)
    root_logger = logging.getLogger('')
    root_logger.addHandler(console)
    root_logger.setLevel(logging.DEBUG)

    # Connect to the event database
    conn = storage.get_connection_from_config(cfg.CONF, 'event')

    # Compute the correct time span
    start = datetime.datetime.utcnow() - datetime.timedelta(days=args.start)
    end = datetime.datetime.utcnow() + datetime.timedelta(days=args.end)

    make_test_data(conn=conn,
                   start=start,
                   end=end,
                   interval=args.interval,
                   event_types=args.event_types)


if __name__ == '__main__':
    main()