#!/usr/bin/python
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
#
from __future__ import absolute_import, division, print_function

__metaclass__ = type


DOCUMENTATION = """
module: nxos_smu
extends_documentation_fragment:
- cisco.nxos.nxos
short_description: Perform SMUs on Cisco NX-OS devices.
description:
- Perform software maintenance upgrades (SMUs) on Cisco NX-OS devices.
version_added: 1.0.0
author: Gabriele Gerbino (@GGabriele)
notes:
- Tested against NXOSv 7.3.(0)D1(1) on VIRL
- The module can only activate and commit a package, not remove or deactivate it.
- Use C(transport=nxapi) to avoid connection timeout
options:
  pkg:
    description:
    - Name of the remote package.
    required: true
  file_system:
    description:
    - The remote file system of the device. If omitted, devices that support a file_system
      parameter will use their default values.
"""

EXAMPLES = """
- cisco.nxos.nxos_smu:
    pkg: nxos.CSCuz65185-n9k_EOR-1.0.0-7.0.3.I2.2d.lib32_n9000.rpm
"""

RETURN = """
commands:
    description: commands sent to the device
    returned: always
    type: list
    sample: ["install add bootflash:nxos.CSCuz65185-n9k_EOR-1.0.0-7.0.3.I2.2d.lib32_n9000.rpm",
             "install activate bootflash:nxos.CSCuz65185-n9k_EOR-1.0.0-7.0.3.I2.2d.lib32_n9000.rpm force",
             "install commit bootflash:nxos.CSCuz65185-n9k_EOR-1.0.0-7.0.3.I2.2d.lib32_n9000.rpm"]
"""


import time

from ansible_collections.cisco.nxos.plugins.module_utils.network.nxos.nxos import (
    load_config,
    run_commands,
)
from ansible_collections.cisco.nxos.plugins.module_utils.network.nxos.nxos import (
    nxos_argument_spec,
)
from ansible.module_utils.basic import AnsibleModule


def execute_show_command(command, module):
    cmds = [{"command": command, "output": "text"}]

    return run_commands(module, cmds)


def remote_file_exists(module, dst, file_system="bootflash:"):
    command = "dir {0}/{1}".format(file_system, dst)
    body = execute_show_command(command, module)
    if "No such file" in body[0]:
        return False
    return True


def apply_patch(module, commands):
    for command in commands:
        load_config(module, [command])
        time.sleep(5)


def get_commands(module, pkg, file_system):
    commands = []
    splitted_pkg = pkg.split(".")
    fixed_pkg = ".".join(splitted_pkg[0:-1])

    command = "show install inactive"
    inactive_body = execute_show_command(command, module)

    command = "show install active"
    active_body = execute_show_command(command, module)

    if fixed_pkg not in inactive_body[0] and fixed_pkg not in active_body[0]:
        commands.append("install add {0}{1}".format(file_system, pkg))

    if fixed_pkg not in active_body[0]:
        commands.append(
            "install activate {0}{1} force".format(file_system, pkg)
        )
    command = "show install committed"
    install_body = execute_show_command(command, module)
    if fixed_pkg not in install_body[0]:
        commands.append("install commit {0}{1}".format(file_system, pkg))

    return commands


def main():
    argument_spec = dict(
        pkg=dict(required=True),
        file_system=dict(required=False, default="bootflash:"),
    )

    argument_spec.update(nxos_argument_spec)

    module = AnsibleModule(
        argument_spec=argument_spec, supports_check_mode=True
    )

    warnings = list()
    results = {"changed": False, "commands": [], "warnings": warnings}

    pkg = module.params["pkg"]
    file_system = module.params["file_system"]
    remote_exists = remote_file_exists(module, pkg, file_system=file_system)

    if not remote_exists:
        module.fail_json(
            msg="The requested package doesn't exist on the device"
        )

    commands = get_commands(module, pkg, file_system)
    if commands:
        results["changed"] = True
        if not module.check_mode:
            apply_patch(module, commands)
        if "configure" in commands:
            commands.pop(0)
        results["commands"] = commands

    module.exit_json(**results)


if __name__ == "__main__":
    main()
