#!/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_snmp_traps
extends_documentation_fragment:
- cisco.nxos.nxos
short_description: Manages SNMP traps.
description:
- Manages SNMP traps configurations.
version_added: 1.0.0
author:
- Jason Edelman (@jedelman8)
notes:
- Tested against NXOSv 7.3.(0)D1(1) on VIRL
- This module works at the group level for traps.  If you need to only enable/disable
  1 specific trap within a group, use the M(nxos_command) module.
- Be aware that you can set a trap only for an enabled feature.
options:
  group:
    description:
    - Case sensitive group.
    required: true
    choices:
    - aaa
    - bfd
    - bgp
    - bridge
    - callhome
    - cfs
    - config
    - eigrp
    - entity
    - feature-control
    - generic
    - hsrp
    - license
    - link
    - lldp
    - mmode
    - ospf
    - pim
    - rf
    - rmon
    - snmp
    - storm-control
    - stpx
    - switchfabric
    - syslog
    - sysmgr
    - system
    - upgrade
    - vtp
    - all
  state:
    description:
    - Manage the state of the resource.
    required: false
    default: enabled
    choices:
    - enabled
    - disabled
"""

EXAMPLES = """
# ensure lldp trap configured
- cisco.nxos.nxos_snmp_traps:
    group: lldp
    state: enabled

# ensure lldp trap is not configured
- cisco.nxos.nxos_snmp_traps:
    group: lldp
    state: disabled
"""

RETURN = """
commands:
    description: command sent to the device
    returned: always
    type: list
    sample: "snmp-server enable traps lldp ;"
"""


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_collections.cisco.nxos.plugins.module_utils.network.nxos.nxos import (
    get_capabilities,
)
from ansible.module_utils.basic import AnsibleModule


def get_platform_id(module):
    info = get_capabilities(module).get("device_info", {})
    return info.get("network_os_platform", "")


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

    return run_commands(module, command)


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_snmp_traps(group, module):
    body = execute_show_command("show run snmp all", module)[0].split("\n")

    resource = {}
    feature_list = [
        "aaa",
        "bfd",
        "bgp",
        "bridge",
        "callhome",
        "cfs",
        "config",
        "eigrp",
        "entity",
        "feature-control",
        "generic",
        "hsrp",
        "license",
        "link",
        "lldp",
        "mmode",
        "ospf",
        "pim",
        "rf",
        "rmon",
        "snmp",
        "storm-control",
        "stpx",
        "switchfabric",
        "syslog",
        "sysmgr",
        "system",
        "upgrade",
        "vtp",
    ]

    if "all" in group and "N3K-C35" in get_platform_id(module):
        module.warn(
            "Platform does not support bfd traps; bfd ignored for 'group: all' request"
        )
        feature_list.remove("bfd")

    for each in feature_list:
        for line in body:
            if each == "ospf":
                # ospf behaves differently when routers are present
                if "snmp-server enable traps ospf" == line:
                    resource[each] = True
                    break
            else:
                if "enable traps {0}".format(each) in line:
                    if "no " in line:
                        resource[each] = False
                        break
                    else:
                        resource[each] = True

    for each in feature_list:
        if resource.get(each) is None:
            # on some platforms, the 'no' cmd does not
            # show up and so check if the feature is enabled
            body = execute_show_command("show run | inc feature", module)[0]
            if "feature {0}".format(each) in body:
                resource[each] = False

    find = resource.get(group, None)

    if group == "all".lower():
        return resource
    elif find is not None:
        trap_resource = {group: find}
        return trap_resource
    else:
        # if 'find' is None, it means that 'group' is a
        # currently disabled feature.
        return {}


def get_trap_commands(group, state, existing, module):
    commands = []
    enabled = False
    disabled = False

    if group == "all":
        if state == "disabled":
            for feature in existing:
                if existing[feature]:
                    trap_command = "no snmp-server enable traps {0}".format(
                        feature
                    )
                    commands.append(trap_command)

        elif state == "enabled":
            for feature in existing:
                if existing[feature] is False:
                    trap_command = "snmp-server enable traps {0}".format(
                        feature
                    )
                    commands.append(trap_command)

    else:
        if group in existing:
            if existing[group]:
                enabled = True
            else:
                disabled = True

            if state == "disabled" and enabled:
                commands.append(
                    ["no snmp-server enable traps {0}".format(group)]
                )
            elif state == "enabled" and disabled:
                commands.append(["snmp-server enable traps {0}".format(group)])
        else:
            module.fail_json(
                msg="{0} is not a currently " "enabled feature.".format(group)
            )

    return commands


def main():
    argument_spec = dict(
        state=dict(choices=["enabled", "disabled"], default="enabled"),
        group=dict(
            choices=[
                "aaa",
                "bfd",
                "bgp",
                "bridge",
                "callhome",
                "cfs",
                "config",
                "eigrp",
                "entity",
                "feature-control",
                "generic",
                "hsrp",
                "license",
                "link",
                "lldp",
                "mmode",
                "ospf",
                "pim",
                "rf",
                "rmon",
                "snmp",
                "storm-control",
                "stpx",
                "switchfabric",
                "syslog",
                "sysmgr",
                "system",
                "upgrade",
                "vtp",
                "all",
            ],
            required=True,
        ),
    )

    argument_spec.update(nxos_argument_spec)

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

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

    group = module.params["group"].lower()
    state = module.params["state"]

    existing = get_snmp_traps(group, module)

    commands = get_trap_commands(group, state, existing, module)
    cmds = flatten_list(commands)
    if cmds:
        results["changed"] = True
        if not module.check_mode:
            load_config(module, cmds)

        if "configure" in cmds:
            cmds.pop(0)
        results["commands"] = cmds

    module.exit_json(**results)


if __name__ == "__main__":
    main()
