# Copyright (c) 2016 Cisco and/or its affiliates.
# 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.

"""DUT setup library."""

from robot.api import logger

from resources.libraries.python.topology import NodeType
from resources.libraries.python.ssh import SSH
from resources.libraries.python.constants import Constants
from resources.libraries.python.VatExecutor import VatExecutor


class DUTSetup(object):
    """Contains methods for setting up DUTs."""
    @staticmethod
    def start_vpp_service_on_all_duts(nodes):
        """Start up the VPP service on all nodes."""
        ssh = SSH()
        for node in nodes.values():
            if node['type'] == NodeType.DUT:
                ssh.connect(node)
                (ret_code, stdout, stderr) = \
                    ssh.exec_command_sudo('service vpp restart', timeout=120)
                if int(ret_code) != 0:
                    logger.debug('stdout: {0}'.format(stdout))
                    logger.debug('stderr: {0}'.format(stderr))
                    raise Exception('DUT {0} failed to start VPP service'.
                                    format(node['host']))

    @staticmethod
    def vpp_show_version_verbose(node):
        """Run "show version verbose" CLI command.

        :param node: Node to run command on.
        :type node: dict
        """
        vat = VatExecutor()
        vat.execute_script("show_version_verbose.vat", node, json_out=False)

    @staticmethod
    def vpp_api_trace_save(node):
        """Run "api trace save" CLI command.

        :param node: Node to run command on.
        :type node: dict
        """
        vat = VatExecutor()
        vat.execute_script("api_trace_save.vat", node, json_out=False)

    @staticmethod
    def vpp_api_trace_dump(node):
        """Run "api trace custom-dump" CLI command.

        :param node: Node to run command on.
        :type node: dict
        """
        vat = VatExecutor()
        vat.execute_script("api_trace_dump.vat", node, json_out=False)

    @staticmethod
    def setup_all_duts(nodes):
        """Prepare all DUTs in given topology for test execution."""
        for node in nodes.values():
            if node['type'] == NodeType.DUT:
                DUTSetup.setup_dut(node)

    @staticmethod
    def setup_dut(node):
        """Run script over SSH to setup the DUT node.

        :param node: DUT node to set up.
        :type node: dict

        :raises Exception: If the DUT setup fails.
        """
        ssh = SSH()
        ssh.connect(node)

        (ret_code, stdout, stderr) = \
            ssh.exec_command('sudo -Sn bash {0}/{1}/dut_setup.sh'.
                             format(Constants.REMOTE_FW_DIR,
                                    Constants.RESOURCES_LIB_SH), timeout=120)
        logger.trace(stdout)
        logger.trace(stderr)
        if int(ret_code) != 0:
            logger.debug('DUT {0} setup script failed: "{1}"'.
                         format(node['host'], stdout + stderr))
            raise Exception('DUT test setup script failed at node {}'.
                            format(node['host']))

    @staticmethod
    def get_vpp_pid(node):
        """Get PID of running VPP process.

        :param node: DUT node.
        :type node: dict
        :return: PID
        :rtype: int
        :raises RuntimeError if it is not possible to get the PID.
        """

        ssh = SSH()
        ssh.connect(node)
        ret_code, stdout, stderr = ssh.exec_command('pidof vpp')

        logger.trace(stdout)
        logger.trace(stderr)

        if int(ret_code) != 0:
            logger.debug('Not possible to get PID of VPP process on node: '
                         '{0}\n {1}'.format(node['host'], stdout + stderr))
            raise RuntimeError('Not possible to get PID of VPP process on node:'
                               ' {}'.format(node['host']))

        if len(stdout.splitlines()) != 1:
            raise RuntimeError("More then one VPP PID found on node {0}".
                               format(node['host']))
        return int(stdout)

    @staticmethod
    def get_vpp_pids(nodes):
        """Get PID of running VPP process on all DUTs.

        :param nodes: DUT nodes.
        :type nodes: dict
        :return: PIDs
        :rtype: dict
        """

        pids = dict()
        for node in nodes.values():
            if node['type'] == NodeType.DUT:
                pids[node['host']] = DUTSetup.get_vpp_pid(node)
        return pids