#!/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/>.
#

ANSIBLE_METADATA = {'metadata_version': '1.1',
                    'status': ['preview'],
                    'supported_by': 'network'}


DOCUMENTATION = '''
---
module: nxos_igmp_interface
extends_documentation_fragment: nxos
version_added: "2.2"
short_description: Manages IGMP interface configuration.
description:
    - Manages IGMP interface configuration settings.
author:
    - Jason Edelman (@jedelman8)
    - Gabriele Gerbino (@GGabriele)
notes:
    - Tested against NXOSv 7.3.(0)D1(1) on VIRL
    - When C(state=default), supported params will be reset to a default state.
      These include C(version), C(startup_query_interval),
      C(startup_query_count), C(robustness), C(querier_timeout), C(query_mrt),
      C(query_interval), C(last_member_qrt), C(last_member_query_count),
      C(group_timeout), C(report_llg), and C(immediate_leave).
    - When C(state=absent), all configs for C(oif_prefix), C(oif_source), and
      C(oif_routemap) will be removed.
    - PIM must be enabled to use this module.
    - This module is for Layer 3 interfaces.
    - Route-map check not performed (same as CLI) check when configuring
      route-map with 'static-oif'
    - If restart is set to true with other params set, the restart will happen
      last, i.e. after the configuration takes place.
options:
    interface:
        description:
            - The full interface name for IGMP configuration.
              e.g. I(Ethernet1/2).
        required: true
    version:
        description:
            - IGMP version. It can be 2 or 3.
        required: false
        default: null
        choices: ['2', '3']
    startup_query_interval:
        description:
            - Query interval used when the IGMP process starts up.
              The range is from 1 to 18000. The default is 31.
        required: false
        default: null
    startup_query_count:
        description:
            - Query count used when the IGMP process starts up.
              The range is from 1 to 10. The default is 2.
        required: false
        default: null
    robustness:
        description:
            - Sets the robustness variable. Values can range from 1 to 7.
              The default is 2.
        required: false
        default: null
    querier_timeout:
        description:
            - Sets the querier timeout that the software uses when deciding
              to take over as the querier. Values can range from 1 to 65535
              seconds. The default is 255 seconds.
        required: false
        default: null
    query_mrt:
        description:
            - Sets the response time advertised in IGMP queries.
              Values can range from 1 to 25 seconds. The default is 10 seconds.
        required: false
        default: null
    query_interval:
        description:
            - Sets the frequency at which the software sends IGMP host query
              messages. Values can range from 1 to 18000 seconds.
              he default is 125 seconds.
        required: false
        default: null
    last_member_qrt:
        description:
            - Sets the query interval waited after sending membership reports
              before the software deletes the group state. Values can range
              from 1 to 25 seconds. The default is 1 second.
        required: false
        default: null
    last_member_query_count:
        description:
            - Sets the number of times that the software sends an IGMP query
              in response to a host leave message.
              Values can range from 1 to 5. The default is 2.
        required: false
        default: null
    group_timeout:
        description:
            - Sets the group membership timeout for IGMPv2.
              Values can range from 3 to 65,535 seconds.
              The default is 260 seconds.
        required: false
        default: null
    report_llg:
        description:
            - Configures report-link-local-groups.
              Enables sending reports for groups in 224.0.0.0/24.
              Reports are always sent for nonlink local groups.
              By default, reports are not sent for link local groups.
        required: false
        choices: ['true', 'false']
        default: false
    immediate_leave:
        description:
            - Enables the device to remove the group entry from the multicast
              routing table immediately upon receiving a leave message for
              the group. Use this command to minimize the leave latency of
              IGMPv2 group memberships on a given IGMP interface because the
              device does not send group-specific queries.
              The default is disabled.
        required: false
        choices: ['true', 'false']
        default: false
    oif_routemap:
        description:
            - Configure a routemap for static outgoing interface (OIF).
        required: false
        default: null
    oif_prefix:
        description:
            - Configure a prefix for static outgoing interface (OIF).
        required: false
        default: null
    oif_source:
        description:
            - Configure a source for static outgoing interface (OIF).
        required: false
        default: null
    restart:
        description:
            - Restart IGMP.
        required: false
        choices: ['true', 'false']
        default: null
    state:
        description:
            - Manages desired state of the resource.
        required: false
        default: present
        choices: ['present', 'default']
'''
EXAMPLES = '''
- nxos_igmp_interface:
    interface: ethernet1/32
    startup_query_interval: 30
    state: present
    username: "{{ un }}"
    password: "{{ pwd }}"
    host: "{{ inventory_hostname }}"
'''

RETURN = '''
proposed:
    description: k/v pairs of parameters passed into module
    returned: always
    type: dict
    sample: {"asn": "65535", "router_id": "1.1.1.1", "vrf": "test"}
existing:
    description: k/v pairs of existing BGP configuration
    returned: always
    type: dict
    sample: {"asn": "65535", "bestpath_always_compare_med": false,
            "bestpath_aspath_multipath_relax": false,
            "bestpath_compare_neighborid": false,
            "bestpath_compare_routerid": false,
            "bestpath_cost_community_ignore": false,
            "bestpath_med_confed": false,
            "bestpath_med_missing_as_worst": false,
            "bestpath_med_non_deterministic": false, "cluster_id": "",
            "confederation_id": "", "confederation_peers": "",
            "graceful_restart": true, "graceful_restart_helper": false,
            "graceful_restart_timers_restart": "120",
            "graceful_restart_timers_stalepath_time": "300", "local_as": "",
            "log_neighbor_changes": false, "maxas_limit": "",
            "neighbor_down_fib_accelerate": false, "reconnect_interval": "60",
            "router_id": "11.11.11.11", "suppress_fib_pending": false,
            "timer_bestpath_limit": "", "timer_bgp_hold": "180",
            "timer_bgp_keepalive": "60", "vrf": "test"}
end_state:
    description: k/v pairs of BGP configuration after module execution
    returned: always
    type: dict
    sample: {"asn": "65535", "bestpath_always_compare_med": false,
            "bestpath_aspath_multipath_relax": false,
            "bestpath_compare_neighborid": false,
            "bestpath_compare_routerid": false,
            "bestpath_cost_community_ignore": false,
            "bestpath_med_confed": false,
            "bestpath_med_missing_as_worst": false,
            "bestpath_med_non_deterministic": false, "cluster_id": "",
            "confederation_id": "", "confederation_peers": "",
            "graceful_restart": true, "graceful_restart_helper": false,
            "graceful_restart_timers_restart": "120",
            "graceful_restart_timers_stalepath_time": "300", "local_as": "",
            "log_neighbor_changes": false, "maxas_limit": "",
            "neighbor_down_fib_accelerate": false, "reconnect_interval": "60",
            "router_id": "1.1.1.1",  "suppress_fib_pending": false,
            "timer_bestpath_limit": "", "timer_bgp_hold": "180",
            "timer_bgp_keepalive": "60", "vrf": "test"}
updates:
    description: commands sent to the device
    returned: always
    type: list
    sample: ["router bgp 65535", "vrf test", "router-id 1.1.1.1"]
changed:
    description: check to see if a change was made on the device
    returned: always
    type: boolean
    sample: true
'''

from ansible.module_utils.nxos import get_config, load_config, run_commands
from ansible.module_utils.nxos import nxos_argument_spec, check_args
from ansible.module_utils.basic import AnsibleModule

import re

def execute_show_command(command, module, command_type='cli_show'):
    if command_type == 'cli_show_ascii':
        cmds = [{
            'command': command,
            'output': 'text',
        }]
    else:
        cmds = [{
            'command': command,
            'output': 'json',
        }]

    return run_commands(module, cmds)


def get_interface_mode(interface, intf_type, module):
    command = 'show interface {0}'.format(interface)
    interface = {}
    mode = 'unknown'

    if intf_type in ['ethernet', 'portchannel']:
        body = execute_show_command(command, module)[0]
        interface_table = body['TABLE_interface']['ROW_interface']
        mode = str(interface_table.get('eth_mode', 'layer3'))
        if mode == 'access' or mode == 'trunk':
            mode = 'layer2'
    elif intf_type == 'loopback' or intf_type == 'svi':
        mode = 'layer3'
    return mode


def get_interface_type(interface):
    if interface.upper().startswith('ET'):
        return 'ethernet'
    elif interface.upper().startswith('VL'):
        return 'svi'
    elif interface.upper().startswith('LO'):
        return 'loopback'
    elif interface.upper().startswith('MG'):
        return 'management'
    elif interface.upper().startswith('MA'):
        return 'management'
    elif interface.upper().startswith('PO'):
        return 'portchannel'
    else:
        return 'unknown'


def apply_key_map(key_map, table):
    new_dict = {}
    for key, value in table.items():
        new_key = key_map.get(key)
        if new_key:
            value = table.get(key)
            if value:
                new_dict[new_key] = value
            else:
                new_dict[new_key] = value
    return new_dict


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_igmp_interface(module, interface):
    command = 'show ip igmp interface {0}'.format(interface)
    igmp = {}

    key_map = {
        'IGMPVersion': 'version',
        'ConfiguredStartupQueryInterval': 'startup_query_interval',
        'StartupQueryCount': 'startup_query_count',
        'RobustnessVariable': 'robustness',
        'ConfiguredQuerierTimeout': 'querier_timeout',
        'ConfiguredMaxResponseTime': 'query_mrt',
        'ConfiguredQueryInterval': 'query_interval',
        'LastMemberMTR': 'last_member_qrt',
        'LastMemberQueryCount': 'last_member_query_count',
        'ConfiguredGroupTimeout': 'group_timeout'
    }

    body = execute_show_command(command, module)[0]

    if body:
        resource = body['TABLE_vrf']['ROW_vrf']['TABLE_if']['ROW_if']
        igmp = apply_key_map(key_map, resource)
        report_llg = str(resource['ReportingForLinkLocal']).lower()
        if report_llg == 'true':
            igmp['report_llg'] = True
        elif report_llg == 'false':
            igmp['report_llg'] = False

        immediate_leave = str(resource['ImmediateLeave']).lower()  # returns en or dis
        if immediate_leave == 'en' or immediate_leave == 'true':
            igmp['immediate_leave'] = True
        elif immediate_leave == 'dis' or immediate_leave == 'false':
            igmp['immediate_leave'] = False

    # the  next block of code is used to retrieve anything with:
    # ip igmp static-oif *** i.e.. could be route-map ROUTEMAP
    # or PREFIX source <ip>, etc.
    command = 'show run interface {0} | inc oif'.format(interface)

    body = execute_show_command(
        command, module, command_type='cli_show_ascii')[0]

    staticoif = []
    if body:
        split_body = body.split('\n')
        route_map_regex = ('.*ip igmp static-oif route-map\s+'
                           '(?P<route_map>\S+).*')
        prefix_source_regex = ('.*ip igmp static-oif\s+(?P<prefix>'
                               '((\d+.){3}\d+))(\ssource\s'
                               '(?P<source>\S+))?.*')

        for line in split_body:
            temp = {}
            try:
                match_route_map = re.match(route_map_regex, line, re.DOTALL)
                route_map = match_route_map.groupdict()['route_map']
            except AttributeError:
                route_map = ''

            try:
                match_prefix_source = re.match(
                    prefix_source_regex, line, re.DOTALL)
                prefix_source_group = match_prefix_source.groupdict()
                prefix = prefix_source_group['prefix']
                source = prefix_source_group['source']
            except AttributeError:
                prefix = ''
                source = ''

            if route_map:
                temp['route_map'] = route_map
            if prefix:
                temp['prefix'] = prefix
            if source:
                temp['source'] = source
            if temp:
                staticoif.append(temp)

    igmp['oif_routemap'] = None
    igmp['oif_prefix_source'] = []

    if staticoif:
        if len(staticoif) == 1 and staticoif[0].get('route_map'):
            igmp['oif_routemap'] = staticoif[0]['route_map']
        else:
            igmp['oif_prefix_source'] = staticoif

    return igmp


def config_igmp_interface(delta, found_both, found_prefix):
    CMDS = {
        'version': 'ip igmp version {0}',
        'startup_query_interval': 'ip igmp startup-query-interval {0}',
        'startup_query_count': 'ip igmp startup-query-count {0}',
        'robustness': 'ip igmp robustness-variable {0}',
        'querier_timeout': 'ip igmp querier-timeout {0}',
        'query_mrt': 'ip igmp query-max-response-time {0}',
        'query_interval': 'ip igmp query-interval {0}',
        'last_member_qrt': 'ip igmp last-member-query-response-time {0}',
        'last_member_query_count': 'ip igmp last-member-query-count {0}',
        'group_timeout': 'ip igmp group-timeout {0}',
        'report_llg': 'ip igmp report-link-local-groups',
        'immediate_leave': 'ip igmp immediate-leave',
        'oif_prefix_source': 'ip igmp static-oif {0} source {1} ',
        'oif_routemap': 'ip igmp static-oif route-map {0}',
        'oif_prefix': 'ip igmp static-oif {0}',
    }

    commands = []
    command = None

    for key, value in delta.items():
        if key == 'oif_source' or found_both or found_prefix:
            pass
        elif key == 'oif_prefix':
            if delta.get('oif_source'):
                command = CMDS.get('oif_prefix_source').format(
                    delta.get('oif_prefix'), delta.get('oif_source'))
            else:
                command = CMDS.get('oif_prefix').format(
                    delta.get('oif_prefix'))
        elif value:
            command = CMDS.get(key).format(value)
        elif not value:
            command = 'no {0}'.format(CMDS.get(key).format(value))

        if command:
            if command not in commands:
                commands.append(command)
        command = None

    return commands


def get_igmp_interface_defaults():
    version = '2'
    startup_query_interval = '31'
    startup_query_count = '2'
    robustness = '2'
    querier_timeout = '255'
    query_mrt = '10'
    query_interval = '125'
    last_member_qrt = '1'
    last_member_query_count = '2'
    group_timeout = '260'
    report_llg = False
    immediate_leave = False

    args = dict(version=version, startup_query_interval=startup_query_interval,
                startup_query_count=startup_query_count, robustness=robustness,
                querier_timeout=querier_timeout, query_mrt=query_mrt,
                query_interval=query_interval, last_member_qrt=last_member_qrt,
                last_member_query_count=last_member_query_count,
                group_timeout=group_timeout, report_llg=report_llg,
                immediate_leave=immediate_leave)

    default = dict((param, value) for (param, value) in args.items()
                   if value is not None)

    return default


def config_default_igmp_interface(existing, delta, found_both, found_prefix):
    commands = []
    proposed = get_igmp_interface_defaults()
    delta = dict(set(proposed.items()).difference(existing.items()))
    if delta:
        command = config_igmp_interface(delta, found_both, found_prefix)

        if command:
            for each in command:
                commands.append(each)

    return commands


def config_remove_oif(existing, existing_oif_prefix_source):
    commands = []
    command = None
    if existing.get('routemap'):
        command = 'no ip igmp static-oif route-map {0}'.format(
            existing.get('routemap'))
    if existing_oif_prefix_source:
        for each in existing_oif_prefix_source:
            if each.get('prefix') and each.get('source'):
                command = 'no ip igmp static-oif {0} source {1} '.format(
                    each.get('prefix'), each.get('source')
                    )
            elif each.get('prefix'):
                command = 'no ip igmp static-oif {0}'.format(
                    each.get('prefix')
                    )
            if command:
                commands.append(command)
            command = None

    return commands


def main():
    argument_spec = dict(
        interface=dict(required=True, type='str'),
        version=dict(required=False, type='str'),
        startup_query_interval=dict(required=False, type='str'),
        startup_query_count=dict(required=False, type='str'),
        robustness=dict(required=False, type='str'),
        querier_timeout=dict(required=False, type='str'),
        query_mrt=dict(required=False, type='str'),
        query_interval=dict(required=False, type='str'),
        last_member_qrt=dict(required=False, type='str'),
        last_member_query_count=dict(required=False, type='str'),
        group_timeout=dict(required=False, type='str'),
        report_llg=dict(type='bool'),
        immediate_leave=dict(type='bool'),
        oif_routemap=dict(required=False, type='str'),
        oif_prefix=dict(required=False, type='str'),
        oif_source=dict(required=False, type='str'),
        restart=dict(type='bool', default=False),
        state=dict(choices=['present', 'absent', 'default'],
                       default='present'),
        include_defaults=dict(default=True),
        config=dict(),
        save=dict(type='bool', default=False)
    )

    argument_spec.update(nxos_argument_spec)

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

    warnings = list()
    check_args(module, warnings)


    state = module.params['state']
    interface = module.params['interface']
    oif_prefix = module.params['oif_prefix']
    oif_source = module.params['oif_source']
    oif_routemap = module.params['oif_routemap']

    if oif_source:
        if not oif_prefix:
            module.fail_json(msg='oif_prefix required when setting oif_source')

    intf_type = get_interface_type(interface)
    if get_interface_mode(interface, intf_type, module) == 'layer2':
        module.fail_json(msg='this module only works on Layer 3 interfaces')

    if oif_prefix and oif_routemap:
        module.fail_json(msg='cannot use oif_prefix AND oif_routemap.'
                             '  select one.')

    existing = get_igmp_interface(module, interface)
    existing_copy = existing.copy()
    end_state = existing_copy

    if not existing.get('version'):
        module.fail_json(msg='pim needs to be enabled on the interface')

    existing_oif_prefix_source = existing.get('oif_prefix_source')
    # not json serializable
    existing.pop('oif_prefix_source')

    if oif_routemap and existing_oif_prefix_source:
        module.fail_json(msg='Delete static-oif configurations on this '
                             'interface if you want to use a routemap')

    if oif_prefix and existing.get('oif_routemap'):
        module.fail_json(msg='Delete static-oif route-map configuration '
                             'on this interface if you want to config '
                             'static entries')

    args = [
        'version',
        'startup_query_interval',
        'startup_query_count',
        'robustness',
        'querier_timeout',
        'query_mrt',
        'query_interval',
        'last_member_qrt',
        'last_member_query_count',
        'group_timeout',
        'report_llg',
        'immediate_leave',
        'oif_routemap',
        'oif_prefix',
        'oif_source'
    ]

    changed = False
    commands = []
    proposed = dict((k, v) for k, v in module.params.items()
                     if v is not None and k in args)

    CANNOT_ABSENT = ['version', 'startup_query_interval',
                     'startup_query_count', 'robustness', 'querier_timeout',
                     'query_mrt', 'query_interval', 'last_member_qrt',
                     'last_member_query_count', 'group_timeout', 'report_llg',
                     'immediate_leave']

    if state == 'absent':
        for each in CANNOT_ABSENT:
            if each in proposed:
                module.fail_json(msg='only params: oif_prefix, oif_source, '
                                     'oif_routemap can be used when '
                                     'state=absent')

    # delta check for all params except oif_prefix and oif_source
    delta = dict(set(proposed.items()).difference(existing.items()))

    # now check to see there is a delta for prefix and source command option
    found_both = False
    found_prefix = False

    if existing_oif_prefix_source:
        if oif_prefix and oif_source:
            for each in existing_oif_prefix_source:
                if (oif_prefix == each.get('prefix') and
                        oif_source == each.get('source')):
                    found_both = True
            if not found_both:
                delta['prefix'] = oif_prefix
                delta['source'] = oif_source
        elif oif_prefix:
            for each in existing_oif_prefix_source:
                if oif_prefix == each.get('prefix') and not each.get('source'):
                    found_prefix = True
            if not found_prefix:
                delta['prefix'] = oif_prefix

    if state == 'present':
        if delta:
            command = config_igmp_interface(delta, found_both, found_prefix)
            if command:
                commands.append(command)

    elif state == 'default':
        command = config_default_igmp_interface(existing, delta,
                                                found_both, found_prefix)
        if command:
            commands.append(command)
    elif state == 'absent':
        command = None
        if existing.get('oif_routemap') or existing_oif_prefix_source:
            command = config_remove_oif(existing, existing_oif_prefix_source)

        if command:
            commands.append(command)

        command = config_default_igmp_interface(existing, delta,
                                                found_both, found_prefix)
        if command:
            commands.append(command)

    if module.params['restart']:
        commands.append('restart igmp')

    cmds = []
    results = {}
    if commands:
        commands.insert(0, ['interface {0}'.format(interface)])
        cmds = flatten_list(commands)

        if module.check_mode:
            module.exit_json(changed=True, commands=cmds)
        else:
            load_config(module, cmds)
            changed = True
            end_state = get_igmp_interface(module, interface)
            if 'configure' in cmds:
                cmds.pop(0)

    results['proposed'] = proposed
    results['existing'] = existing_copy
    results['updates'] = cmds
    results['changed'] = changed
    results['warnings'] = warnings
    results['end_state'] = end_state

    module.exit_json(**results)


if __name__ == '__main__':
    main()
