# Copyright 2017, Major Hayden <major@mhtx.net>
#
# 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.
"""Get system uptime."""

import platform

import click

from monitorstack.cli import pass_context

DOC = """Get system uptime."""
COMMAND_NAME = 'uptime'


@click.command(COMMAND_NAME, short_help=DOC)
@pass_context
def cli(ctx):
    """Get system uptime."""
    uptime = get_uptime()
    output = {
        'exit_code': 0,
        'message': 'uptime is ok',
        'measurement_name': 'system_uptime',
        'meta': {
            'platform': platform.platform()
        },
        'variables': {
            'uptime': str(uptime)
        }
    }
    return output


def get_uptime():
    """Read the uptime from the proc filesystem."""
    with open('/proc/uptime', 'r') as f:
        output = f.read()

    # /proc/uptime outputs two numbers: seconds since start (which we want)
    # and seconds the machine has spent idle (we don't want that)
    uptime = output.split()[0]

    return float(uptime)