#!/usr/bin/env python3

"""
Copyright 2020 The Magma Authors.

This source code is licensed under the BSD-style license found in the
LICENSE file in the root directory of this source tree.

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 datetime import datetime

import dateutil.parser
import docker
from common.health.entities import Errors, ServiceHealth, Version
from common.health.health_service import GenericHealthChecker


class DockerHealthChecker(GenericHealthChecker):

    def get_error_summary(self, service_names):
        res = {}
        for service_name in service_names:
            client = docker.from_env()
            container = client.containers.get(service_name)

            res[service_name] = Errors(log_level='-', error_count=0)
            for line in container.logs().decode('utf-8').split('\n'):
                if service_name not in line:
                    continue
                # Reset the counter for restart/start
                if 'Starting {}...'.format(service_name) in line:
                    res[service_name].error_count = 0
                elif 'ERROR' in line:
                    res[service_name].error_count += 1
        return res

    def get_magma_services_summary(self):
        services_health_summary = []
        client = docker.from_env()

        for container in client.containers.list():
            service_start_time = dateutil.parser.parse(
                container.attrs['State']['StartedAt'],
            )
            current_time = datetime.now(service_start_time.tzinfo)
            time_running = current_time - service_start_time
            services_health_summary.append(
                ServiceHealth(
                    service_name=container.name,
                    active_state=container.status,
                    sub_state=container.status,
                    time_running=str(time_running).split('.', 1)[0],
                    errors=self.get_error_summary([container.name])[
                        container.name
                    ],
                ),
            )
        return services_health_summary

    def get_magma_version(self):
        client = docker.from_env()
        container = client.containers.get('magmad')

        return Version(
            version_code=container.attrs['Config']['Image'],
            last_update_time='-',
        )