# 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.

from ceilometer.hardware import plugin
from ceilometer.hardware.pollsters import util
from ceilometer import sample


class _Base(plugin.HardwarePollster):

    CACHE_KEY = 'system'


class _SystemBase(_Base):
    def generate_one_sample(self, host, c_data):
        value, metadata, extra = c_data
        return util.make_sample_from_host(host,
                                          name=self.IDENTIFIER,
                                          sample_type=self.TYPE,
                                          unit=self.UNIT,
                                          volume=value,
                                          res_metadata=metadata,
                                          extra=extra)


class SystemCpuIdlePollster(_SystemBase):
    IDENTIFIER = 'system_stats.cpu.idle'
    TYPE = sample.TYPE_GAUGE
    UNIT = '%'


class SystemIORawSentPollster(_SystemBase):
    IDENTIFIER = 'system_stats.io.outgoing.blocks'
    TYPE = sample.TYPE_CUMULATIVE
    UNIT = 'blocks'


class SystemIORawReceivedPollster(_SystemBase):
    IDENTIFIER = 'system_stats.io.incoming.blocks'
    TYPE = sample.TYPE_CUMULATIVE
    UNIT = 'blocks'