#!/usr/bin/env python

# 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.

"""This script provides copy and installation of VPP build deb packages.
   As destinations are used all DUT nodes from the topology file."""

import sys
import argparse
from yaml import load

from resources.libraries.python.ssh import SSH


def ssh_no_error(ssh, cmd, sudo=False):
    """Execute a command over ssh channel, and log and exit if the command
    fails.

    :param ssh: SSH() object connected to a node.
    :param cmd: Command line to execute on remote node.
    :type ssh: SSH() object
    :type cmd: str
    :return: stdout from the SSH command.
    :rtype: str
    """

    if sudo:
        ret, stdo, stde = ssh.exec_command_sudo(cmd, timeout=60)
    else:
        ret, stdo, stde = ssh.exec_command(cmd, timeout=60)

    if ret != 0:
        print 'Command execution failed: "{}"'.format(cmd)
        print 'stdout: {0}'.format(stdo)
        print 'stderr: {0}'.format(stde)
        raise RuntimeError('Unexpected ssh command failure')

    return stdo


def ssh_ignore_error(ssh, cmd, sudo=False):
    """Execute a command over ssh channel, ignore errors.

    :param ssh: SSH() object connected to a node.
    :param cmd: Command line to execute on remote node.
    :type ssh: SSH() object
    :type cmd: str
    :return: stdout from the SSH command.
    :rtype: str
    """

    if sudo:
        ret, stdo, stde = ssh.exec_command_sudo(cmd)
    else:
        ret, stdo, stde = ssh.exec_command(cmd)

    if ret != 0:
        print 'Command execution failed: "{}"'.format(cmd)
        print 'stdout: {0}'.format(stdo)
        print 'stderr: {0}'.format(stde)

    return stdo


def main():
    """Copy and installation of VPP packages."""

    parser = argparse.ArgumentParser()
    parser.add_argument("-t", "--topo", required=True,
                        help="Topology file")
    parser.add_argument("-d", "--directory", required=True,
                        help="Installation directory")
    parser.add_argument("-p", "--packages", required=False, nargs='+',
                        help="Packages paths to copy")
    parser.add_argument("-c", "--cancel", help="Cancel installation",
                        action="store_true")
    parser.add_argument("-hc", "--honeycomb", help="Include Honeycomb package.",
                        required=False, default=False)

    args = parser.parse_args()
    topology_file = args.topo
    packages = args.packages
    install_dir = args.directory
    cancel_installation = args.cancel
    honeycomb = args.honeycomb

    work_file = open(topology_file)
    topology = load(work_file.read())['nodes']

    def fix_interrupted(package):
        """If there are interrupted installations, clean them up."""

        cmd = "dpkg -l | grep {0}".format(package)
        ret, _, _ = ssh.exec_command(cmd)
        if ret == 0:
            # Try to fix interrupted installations
            cmd = 'dpkg --configure -a'
            stdout = ssh_no_error(ssh, cmd, sudo=True)
            print "###TI {}".format(stdout)
            # Try to remove installed packages
            cmd = 'apt-get purge -y "{0}.*"'.format(package)
            stdout = ssh_no_error(ssh, cmd, sudo=True)
            print "###TI {}".format(stdout)

    ssh = SSH()
    for node in topology:
        if topology[node]['type'] == "DUT":
            print "###TI host: {}".format(topology[node]['host'])
            ssh.connect(topology[node])

            if cancel_installation:
                # Remove installation directory on DUT
                cmd = "rm -r {}".format(install_dir)
                stdout = ssh_ignore_error(ssh, cmd)
                print "###TI {}".format(stdout)

                if honeycomb:
                    fix_interrupted("honeycomb")
                    # remove HC logs
                    cmd = "rm -rf /var/log/honeycomb"
                    stdout = ssh_ignore_error(ssh, cmd, sudo=True)
                    print "###TI {}".format(stdout)
                fix_interrupted("vpp")

            else:
                # Create installation directory on DUT
                cmd = "rm -r {0}; mkdir {0}".format(install_dir)
                stdout = ssh_no_error(ssh, cmd)
                print "###TI {}".format(stdout)

                if honeycomb:
                    smd = "ls ~/honeycomb | grep .deb"
                    stdout = ssh_ignore_error(ssh, smd)
                    if "honeycomb" in stdout:
                        # If custom honeycomb packages exist, use them
                        cmd = "cp ~/honeycomb/*.deb {0}".format(install_dir)
                        stdout = ssh_no_error(ssh, cmd)
                        print "###TI {}".format(stdout)
                    else:
                        # Copy packages from local path to installation dir
                        for deb in packages:
                            print "###TI scp: {}".format(deb)
                            ssh.scp(local_path=deb, remote_path=install_dir)
                else:
                    # Copy packages from local path to installation dir
                    for deb in packages:
                        print "###TI scp: {}".format(deb)
                        ssh.scp(local_path=deb, remote_path=install_dir)

                if honeycomb:
                    fix_interrupted("honeycomb")
                fix_interrupted("vpp")

                # Installation of deb packages
                cmd = "dpkg -i --force-all {}/*.deb".format(install_dir)
                stdout = ssh_no_error(ssh, cmd, sudo=True)
                print "###TI {}".format(stdout)

if __name__ == "__main__":
    sys.exit(main())