# Copyright (c) 2019 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.

"""VPP util library."""

from robot.api import logger

from resources.libraries.python.Constants import Constants
from resources.libraries.python.DUTSetup import DUTSetup
from resources.libraries.python.L2Util import L2Util
from resources.libraries.python.PapiExecutor import PapiSocketExecutor
from resources.libraries.python.ssh import exec_cmd_no_error
from resources.libraries.python.topology import NodeType


class VPPUtil(object):
    """General class for any VPP related methods/functions."""

    @staticmethod
    def show_vpp_settings(node, *additional_cmds):
        """Print default VPP settings. In case others are needed, can be
        accepted as next parameters (each setting one parameter), preferably
        in form of a string.

        :param node: VPP node.
        :param additional_cmds: Additional commands that the vpp should print
            settings for.
        :type node: dict
        :type additional_cmds: tuple
        """
        def_setting_tb_displayed = {
            'IPv6 FIB': 'ip6 fib',
            'IPv4 FIB': 'ip fib',
            'Interface IP': 'int addr',
            'Interfaces': 'int',
            'ARP': 'ip arp',
            'Errors': 'err'
        }

        if additional_cmds:
            for cmd in additional_cmds:
                def_setting_tb_displayed['Custom Setting: {}'.format(cmd)] = cmd

        for _, cmd in def_setting_tb_displayed.items():
            command = 'vppctl sh {cmd}'.format(cmd=cmd)
            exec_cmd_no_error(node, command, timeout=30, sudo=True)

    @staticmethod
    def restart_vpp_service(node):
        """Restart VPP service on the specified topology node.

        :param node: Topology node.
        :type node: dict
        """
        DUTSetup.restart_service(node, Constants.VPP_UNIT)

    @staticmethod
    def restart_vpp_service_on_all_duts(nodes):
        """Restart VPP service on all DUT nodes.

        :param nodes: Topology nodes.
        :type nodes: dict
        """
        for node in nodes.values():
            if node['type'] == NodeType.DUT:
                VPPUtil.restart_vpp_service(node)

    @staticmethod
    def stop_vpp_service(node):
        """Stop VPP service on the specified topology node.

        :param node: Topology node.
        :type node: dict
        """
        DUTSetup.stop_service(node, Constants.VPP_UNIT)

    @staticmethod
    def stop_vpp_service_on_all_duts(nodes):
        """Stop VPP service on all DUT nodes.

        :param nodes: Topology nodes.
        :type nodes: dict
        """
        for node in nodes.values():
            if node['type'] == NodeType.DUT:
                VPPUtil.stop_vpp_service(node)

    @staticmethod
    def verify_vpp_installed(node):
        """Verify that VPP is installed on the specified topology node.

        :param node: Topology node.
        :type node: dict
        """
        cmd = 'command -v vpp'
        exec_cmd_no_error(
            node, cmd, message='VPP is not installed!')

    @staticmethod
    def verify_vpp_started(node):
        """Verify that VPP is started on the specified topology node.

        :param node: Topology node.
        :type node: dict
        """
        cmd = ('vppctl show pci 2>&1 | '
               'fgrep -v "Connection refused" | '
               'fgrep -v "No such file or directory"')
        exec_cmd_no_error(
            node, cmd, sudo=True, message='VPP failed to start!', retries=120)

    @staticmethod
    def verify_vpp(node):
        """Verify that VPP is installed and started on the specified topology
        node.

        :param node: Topology node.
        :type node: dict
        :raises RuntimeError: If VPP service fails to start.
        """
        VPPUtil.verify_vpp_installed(node)
        try:
            # Verify responsivness of vppctl.
            VPPUtil.verify_vpp_started(node)
            # Verify responsivness of PAPI.
            VPPUtil.show_log(node)
            VPPUtil.vpp_show_version(node)
        finally:
            DUTSetup.get_service_logs(node, Constants.VPP_UNIT)

    @staticmethod
    def verify_vpp_on_all_duts(nodes):
        """Verify that VPP is installed and started on all DUT nodes.

        :param nodes: Nodes in the topology.
        :type nodes: dict
        """
        for node in nodes.values():
            if node['type'] == NodeType.DUT:
                VPPUtil.verify_vpp(node)

    @staticmethod
    def vpp_show_version(node, verbose=True):
        """Run "show_version" PAPI command.

        :param node: Node to run command on.
        :param verbose: Show version, compile date and compile location if True
            otherwise show only version.
        :type node: dict
        :type verbose: bool
        :returns: VPP version.
        :rtype: str
        """
        with PapiSocketExecutor(node) as papi_exec:
            reply = papi_exec.add('show_version').get_reply()
        return_version = reply['version'].rstrip('\0x00')
        version = 'VPP version:      {ver}\n'.format(ver=return_version)
        if verbose:
            version += ('Compile date:     {date}\n'
                        'Compile location: {cl}\n'.
                        format(date=reply['build_date'].rstrip('\0x00'),
                               cl=reply['build_directory'].rstrip('\0x00')))
        logger.info(version)
        return return_version

    @staticmethod
    def show_vpp_version_on_all_duts(nodes):
        """Show VPP version verbose on all DUTs.

        :param nodes: Nodes in the topology.
        :type nodes: dict
        """
        for node in nodes.values():
            if node['type'] == NodeType.DUT:
                VPPUtil.vpp_show_version(node)

    @staticmethod
    def vpp_show_interfaces(node):
        """Run "show interface" CLI command.

        :param node: Node to run command on.
        :type node: dict
        """

        cmd = 'sw_interface_dump'
        args = dict(name_filter_valid=0, name_filter='')
        err_msg = 'Failed to get interface dump on host {host}'.format(
            host=node['host'])
        with PapiSocketExecutor(node) as papi_exec:
            details = papi_exec.add(cmd, **args).get_details(err_msg)

        for if_dump in details:
            if_dump['interface_name'] = if_dump['interface_name'].rstrip('\x00')
            if_dump['tag'] = if_dump['tag'].rstrip('\x00')
            if_dump['l2_address'] = L2Util.bin_to_mac(if_dump['l2_address'])
        # TODO: return only base data
        logger.trace('Interface data of host {host}:\n{details}'.format(
            host=node['host'], details=details))

    @staticmethod
    def vpp_enable_traces_on_dut(node, fail_on_error=False):
        """Enable vpp packet traces on the DUT node.

        :param node: DUT node to set up.
        :param fail_on_error: If True, keyword fails if an error occurs,
            otherwise passes.
        :type node: dict
        :type fail_on_error: bool
        """
        cmds = [
            "trace add dpdk-input 50",
            "trace add vhost-user-input 50",
            "trace add memif-input 50"
        ]

        for cmd in cmds:
            try:
                PapiSocketExecutor.run_cli_cmd(node, cmd)
            except AssertionError:
                if fail_on_error:
                    raise

    @staticmethod
    def vpp_enable_traces_on_all_duts(nodes, fail_on_error=False):
        """Enable vpp packet traces on all DUTs in the given topology.

        :param nodes: Nodes in the topology.
        :param fail_on_error: If True, keyword fails if an error occurs,
            otherwise passes.
        :type nodes: dict
        :type fail_on_error: bool
        """
        for node in nodes.values():
            if node['type'] == NodeType.DUT:
                VPPUtil.vpp_enable_traces_on_dut(node, fail_on_error)

    @staticmethod
    def vpp_enable_elog_traces_on_dut(node):
        """Enable API/CLI/Barrier traces on the DUT node.

        :param node: DUT node to set up.
        :type node: dict
        """
        PapiSocketExecutor.run_cli_cmd(node, "elog trace api cli barrier")

    @staticmethod
    def vpp_enable_elog_traces_on_all_duts(nodes):
        """Enable API/CLI/Barrier traces on all DUTs in the given topology.

        :param nodes: Nodes in the topology.
        :type nodes: dict
        """
        for node in nodes.values():
            if node['type'] == NodeType.DUT:
                VPPUtil.vpp_enable_elog_traces_on_dut(node)

    @staticmethod
    def show_event_logger_on_dut(node):
        """Show event logger on the DUT node.

        :param node: DUT node to show traces on.
        :type node: dict
        """
        PapiSocketExecutor.run_cli_cmd(node, "show event-logger")

    @staticmethod
    def show_event_logger_on_all_duts(nodes):
        """Show event logger on all DUTs in the given topology.

        :param nodes: Nodes in the topology.
        :type nodes: dict
        """
        for node in nodes.values():
            if node['type'] == NodeType.DUT:
                VPPUtil.show_event_logger_on_dut(node)

    @staticmethod
    def show_log(node):
        """Show log on the specified topology node.

        :param node: Topology node.
        :type node: dict
        :returns: VPP log data.
        :rtype: list
        """
        return PapiSocketExecutor.run_cli_cmd(node, "show log")

    @staticmethod
    def vpp_show_threads(node):
        """Show VPP threads on node.

        :param node: Node to run command on.
        :type node: dict
        :returns: VPP thread data.
        :rtype: list
        """
        with PapiSocketExecutor(node) as papi_exec:
            reply = papi_exec.add('show_threads').get_reply()

        threads_data = list()
        for thread in reply["thread_data"]:
            thread_data = list()
            for item in thread:
                if isinstance(item, unicode):
                    item = item.rstrip('\x00')
                thread_data.append(item)
            threads_data.append(thread_data)

        logger.info("show threads:\n{threads}".format(threads=threads_data))

        return threads_data