#!/usr/bin/env python
# Copyright 2016,2022 IBM Corp. 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.

"""
Example that creates a metrics context, retrieves metrics and deletes the
metrics context.
"""

import sys
import time
import urllib3

import zhmcclient
from zhmcclient.testutils import hmc_definitions, setup_hmc_session


def main():
    "Main function of the script"

    urllib3.disable_warnings()

    print(__doc__)

    # Get HMC info from HMC inventory and vault files
    hmc_def = hmc_definitions()[0]
    host = hmc_def.host
    print(f"Creating a session with the HMC at {host} ...")
    try:
        session = setup_hmc_session(hmc_def)
    except zhmcclient.Error as exc:
        print(f"Error: Cannot establish session with HMC {host}: "
              f"{exc.__class__.__name__}: {exc}")
        return 1

    try:
        client = zhmcclient.Client(session)

        try:
            metric_groups = [

                # Please edit this section so it contains only the metric groups
                # that mnatch the operational mode of the targeted CPC.

                'cpc-usage-overview',  # Only in classic mode
                'logical-partition-usage',  # Only in classic mode
                'channel-usage',  # Only in classic mode

                'dpm-system-usage-overview',  # Only in DPM mode
                'partition-usage',  # Only in DPM mode
                'adapter-usage',  # Only in DPM mode
                'crypto-usage',  # Only in DPM mode
                'flash-memory-usage',  # Only in DPM mode
                'roce-usage',  # Only in DPM mode

                # 'environmental-power-status',  # In any mode starting with z15

                # 'virtualization-host-cpu-memory-usage',  # Only  ensemble mode

            ]

            print("Creating Metrics Context ...")
            mc = client.metrics_contexts.create(
                {'anticipated-frequency-seconds': 15,
                 'metric-groups': metric_groups})

            sleep_time = 15  # seconds

            print(f"Sleeping for {sleep_time} seconds ...")
            time.sleep(sleep_time)

            print("Retrieving the current metric values ...")
            mr_str = mc.get_metrics()

            print("Current metric values:")
            mr = zhmcclient.MetricsResponse(mc, mr_str)
            for mg in mr.metric_group_values:
                mg_name = mg.name
                mg_def = mc.metric_group_definitions[mg_name]
                print(f"  Metric group: {mg_name}")
                for ov in mg.object_values:
                    print(f"    Resource: {ov.resource_uri}")
                    print(f"    Timestamp: {ov.timestamp}")
                    print("    Metric values:")
                    for m_name in ov.metrics:
                        m_value = ov.metrics[m_name]
                        m_def = mg_def.metric_definitions[m_name]
                        m_unit = m_def.unit or ''
                        print(f"      {m_name:30}  {m_value} {m_unit}")
                if not mg.object_values:
                    print("    No resources")

            print("Deleting Metrics Context ...")
            mc.delete()

        except zhmcclient.Error as exc:
            print(f"{exc.__class__.__name__}: {exc}")
            return 1

        return 0

    finally:
        print("Logging off ...")
        session.logoff()


if __name__ == '__main__':
    sys.exit(main())
