#!/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_udld_interface
extends_documentation_fragment:
- cisco.nxos.nxos
short_description: Manages UDLD interface configuration params.
description:
- Manages UDLD interface configuration params.
version_added: 1.0.0
author:
- Jason Edelman (@jedelman8)
notes:
- Tested against NXOSv 7.3.(0)D1(1) on VIRL
- Unsupported for Cisco MDS
- Feature UDLD must be enabled on the device to use this module.
options:
  mode:
    description:
    - Manages UDLD mode for an interface.
    required: true
    choices:
    - enabled
    - disabled
    - aggressive
    type: str
  interface:
    description:
    - FULL name of the interface, i.e. Ethernet1/1-
    required: true
    type: str
  state:
    description:
    - Manage the state of the resource.
    required: false
    default: present
    choices:
    - present
    - absent
    type: str
"""
EXAMPLES = """
# ensure Ethernet1/1 is configured to be in aggressive mode
- cisco.nxos.nxos_udld_interface:
    interface: Ethernet1/1
    mode: aggressive
    state: present
    host: '{{ inventory_hostname }}'
    username: '{{ un }}'
    password: '{{ pwd }}'

# Remove the aggressive config only if it's currently in aggressive mode and then disable udld (switch default)
- cisco.nxos.nxos_udld_interface:
    interface: Ethernet1/1
    mode: aggressive
    state: absent
    host: '{{ inventory_hostname }}'
    username: '{{ un }}'
    password: '{{ pwd }}'

# ensure Ethernet1/1 has aggressive mode enabled
- cisco.nxos.nxos_udld_interface:
    interface: Ethernet1/1
    mode: enabled
    host: '{{ inventory_hostname }}'
    username: '{{ un }}'
    password: '{{ pwd }}'
"""

RETURN = """
proposed:
    description: k/v pairs of parameters passed into module
    returned: always
    type: dict
    sample: {"mode": "enabled"}
existing:
    description:
        - k/v pairs of existing configuration
    returned: always
    type: dict
    sample: {"mode": "aggressive"}
end_state:
    description: k/v pairs of configuration after module execution
    returned: always
    type: dict
    sample: {"mode": "enabled"}
updates:
    description: command sent to the device
    returned: always
    type: list
    sample: ["interface ethernet1/33",
            "no udld aggressive ; no udld disable"]
changed:
    description: check to see if a change was made on the device
    returned: always
    type: bool
    sample: true
"""


from ansible.module_utils.basic import AnsibleModule

from ansible_collections.cisco.nxos.plugins.module_utils.network.nxos.nxos import (
    load_config,
    run_commands,
)


def flatten_list(command_lists):
    flat_command_list = []
    for command in command_lists:
        if isinstance(command, list):
            flat_command_list.extend(command)
        else:
            flat_command_list.append(command)
    return flat_command_list


def get_udld_interface(module, interface):
    command = "show run udld all | section " + interface.title() + "$"
    interface_udld = {}
    mode = None
    mode_str = None
    try:
        body = run_commands(module, [{"command": command, "output": "text"}])[0]
        if "aggressive" in body:
            mode = "aggressive"
            mode_str = "aggressive"
        elif "no udld enable" in body:
            mode = "disabled"
            mode_str = "no udld enable"
        elif "no udld disable" in body:
            mode = "enabled"
            mode_str = "no udld disable"
        elif "udld disable" in body:
            mode = "disabled"
            mode_str = "udld disable"
        elif "udld enable" in body:
            mode = "enabled"
            mode_str = "udld enable"
        interface_udld["mode"] = mode

    except (KeyError, AttributeError, IndexError):
        interface_udld = {}

    return interface_udld, mode_str


def get_commands_config_udld_interface1(delta, interface, module, existing):
    commands = []
    mode = delta["mode"]
    if mode == "aggressive":
        commands.append("udld aggressive")
    else:
        commands.append("no udld aggressive")
    commands.insert(0, "interface {0}".format(interface))

    return commands


def get_commands_config_udld_interface2(delta, interface, module, existing):
    commands = []
    existing, mode_str = get_udld_interface(module, interface)
    mode = delta["mode"]
    if mode == "enabled":
        if mode_str == "no udld enable":
            command = "udld enable"
        else:
            command = "no udld disable"
    else:
        if mode_str == "no udld disable":
            command = "udld disable"
        else:
            command = "no udld enable"
    if command:
        commands.append(command)
        commands.insert(0, "interface {0}".format(interface))

    return commands


def get_commands_remove_udld_interface(delta, interface, module, existing):
    commands = []
    existing, mode_str = get_udld_interface(module, interface)

    mode = delta["mode"]
    if mode == "aggressive":
        command = "no udld aggressive"
    else:
        if mode == "enabled":
            if mode_str == "udld enable":
                command = "no udld enable"
            else:
                command = "udld disable"
        elif mode == "disabled":
            if mode_str == "no udld disable":
                command = "udld disable"
            else:
                command = "no udld enable"
    if command:
        commands.append(command)
        commands.insert(0, "interface {0}".format(interface))

    return commands


def main():
    argument_spec = dict(
        mode=dict(choices=["enabled", "disabled", "aggressive"], required=True),
        interface=dict(type="str", required=True),
        state=dict(choices=["absent", "present"], default="present"),
    )

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

    warnings = list()

    interface = module.params["interface"].lower()
    mode = module.params["mode"]
    state = module.params["state"]

    proposed = dict(mode=mode)
    existing, mode_str = get_udld_interface(module, interface)
    end_state = existing

    delta = dict(set(proposed.items()).difference(existing.items()))

    changed = False
    commands = []
    cmds = []
    if state == "present":
        if delta:
            command = get_commands_config_udld_interface1(delta, interface, module, existing)
            commands.append(command)
            cmds = flatten_list(commands)
            if module.check_mode:
                module.exit_json(changed=True, commands=cmds)
            else:
                changed = True
                load_config(module, cmds)

            if delta["mode"] == "enabled" or delta["mode"] == "disabled":
                commands = []
                command = get_commands_config_udld_interface2(delta, interface, module, existing)
                commands.append(command)
                cmds = flatten_list(commands)
                if module.check_mode:
                    module.exit_json(changed=True, commands=cmds)
                else:
                    load_config(module, cmds)

    else:
        common = set(proposed.items()).intersection(existing.items())
        if common:
            command = get_commands_remove_udld_interface(dict(common), interface, module, existing)
            cmds = flatten_list(commands)
            if module.check_mode:
                module.exit_json(changed=True, commands=cmds)
            else:
                changed = True
                load_config(module, cmds)

    if not module.check_mode:
        end_state, mode_str = get_udld_interface(module, interface)
        if "configure" in cmds:
            cmds.pop(0)

    results = {}
    results["proposed"] = proposed
    results["existing"] = existing
    results["end_state"] = end_state
    results["updates"] = cmds
    results["changed"] = changed
    results["warnings"] = warnings

    module.exit_json(**results)


if __name__ == "__main__":
    main()