#!/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_ntp_options
extends_documentation_fragment:
- cisco.nxos.nxos
short_description: Manages NTP options.
description:
- Manages NTP options, e.g. authoritative server and logging.
version_added: 1.0.0
author:
- Jason Edelman (@jedelman8)
notes:
- Tested against NXOSv 7.3.(0)D1(1) on VIRL
- When C(state=absent), master and logging will be set to False and stratum will be
  removed as well
options:
  master:
    description:
    - Sets whether the device is an authoritative NTP server.
    type: bool
  stratum:
    description:
    - If C(master=true), an optional stratum can be supplied (1-15). The device default
      is 8.
    type: str
  logging:
    description:
    - Sets whether NTP logging is enabled on the device.
    type: bool
  state:
    description:
    - Manage the state of the resource.
    default: present
    choices:
    - present
    - absent
    type: str
"""
EXAMPLES = """
# Basic NTP options configuration
- cisco.nxos.nxos_ntp_options:
    master: true
    stratum: 12
    logging: false
    host: '{{ inventory_hostname }}'
    username: '{{ un }}'
    password: '{{ pwd }}'
"""

RETURN = """
updates:
    description: command sent to the device
    returned: always
    type: list
    sample: ["no ntp logging", "ntp master 12"]
"""
import re

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 get_current(module):
    cmd = "show running-config | inc ntp"

    master = False
    logging = False
    stratum = None

    output = run_commands(module, ({"command": cmd, "output": "text"}))[0]

    if output:
        match = re.search(r"^ntp master(?: (\d+))", output, re.M)
        if match:
            master = True
            stratum = match.group(1)
        logging = "ntp logging" in output.lower()

    return {"master": master, "stratum": stratum, "logging": logging}


def main():
    argument_spec = dict(
        master=dict(required=False, type="bool"),
        stratum=dict(required=False, type="str"),
        logging=dict(required=False, type="bool"),
        state=dict(choices=["absent", "present"], default="present"),
    )

    argument_spec.update(nxos_argument_spec)

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

    warnings = list()

    master = module.params["master"]
    stratum = module.params["stratum"]
    logging = module.params["logging"]
    state = module.params["state"]

    if stratum and master is False:
        if stratum != 8:
            module.fail_json(msg="master MUST be True when stratum is changed")

    current = get_current(module)

    result = {"changed": False}

    commands = list()

    if state == "absent":
        if current["master"]:
            commands.append("no ntp master")
        if current["logging"]:
            commands.append("no ntp logging")

    elif state == "present":
        if master and not current["master"]:
            commands.append("ntp master")
        elif master is False and current["master"]:
            commands.append("no ntp master")
        if stratum and stratum != current["stratum"]:
            commands.append("ntp master %s" % stratum)

        if logging and not current["logging"]:
            commands.append("ntp logging")
        elif logging is False and current["logging"]:
            commands.append("no ntp logging")

    result["commands"] = commands
    result["updates"] = commands

    if commands:
        if not module.check_mode:
            load_config(module, commands)
        result["changed"] = True

    result["warnings"] = warnings

    module.exit_json(**result)


if __name__ == "__main__":
    main()
