#!/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': '1.0',
                    'status': ['preview'],
                    'supported_by': 'community'}


DOCUMENTATION = '''
---
module: nxos_igmp_snooping
extends_documentation_fragment: nxos
version_added: "2.2"
short_description: Manages IGMP snooping global configuration.
description:
    - Manages IGMP snooping global configuration.
author:
    - Jason Edelman (@jedelman8)
    - Gabriele Gerbino (@GGabriele)
notes:
    - When C(state=default), params will be reset to a default state.
    - C(group_timeout) also accepts I(never) as an input.
options:
    snooping:
        description:
            - Enables/disables IGMP snooping on the switch.
        required: false
        default: null
        choices: ['true', 'false']
    group_timeout:
        description:
            - Group membership timeout value for all VLANs on the device.
              Accepted values are integer in range 1-10080, I(never) and
              I(default).
        required: false
        default: null
    link_local_grp_supp:
        description:
            - Global link-local groups suppression.
        required: false
        default: null
        choices: ['true', 'false']
    report_supp:
        description:
            - Global IGMPv1/IGMPv2 Report Suppression.
        required: false
        default: null
    v3_report_supp:
        description:
            - Global IGMPv3 Report Suppression and Proxy Reporting.
        required: false
        default: null
        choices: ['true', 'false']
    state:
        description:
            - Manage the state of the resource.
        required: false
        default: present
        choices: ['present','default']
'''

EXAMPLES = '''
# ensure igmp snooping params supported in this module are in there default state
- nxos_igmp_snooping:
    state: default
    host:  inventory_hostname }}
    username:  un }}
    password:  pwd }}

# ensure following igmp snooping params are in the desired state
- nxos_igmp_snooping:
   group_timeout: never
   snooping: true
   link_local_grp_supp: false
   optimize_mcast_flood: false
   report_supp: true
   v3_report_supp: true
   host: "{{ inventory_hostname }}"
   username: "{{ un }}"
   password: "{{ pwd }}"
'''

RETURN = '''
proposed:
    description: k/v pairs of parameters passed into module
    returned: always
    type: dict
    sample: {"group_timeout": "50", "link_local_grp_supp": true,
            "report_supp": false, "snooping": false, "v3_report_supp": false}
existing:
    description:
        - k/v pairs of existing configuration
    type: dict
    sample: {"group_timeout": "never", "link_local_grp_supp": false,
            "report_supp": true, "snooping": true, "v3_report_supp": true}
end_state:
    description: k/v pairs of configuration after module execution
    returned: always
    type: dict
    sample: {"group_timeout": "50", "link_local_grp_supp": true,
            "report_supp": false, "snooping": false, "v3_report_supp": false}
updates:
    description: command sent to the device
    returned: always
    type: list
    sample: ["ip igmp snooping link-local-groups-suppression",
             "ip igmp snooping group-timeout 50",
             "no ip igmp snooping report-suppression",
             "no ip igmp snooping v3-report-suppression",
             "no ip igmp snooping"]
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
from ansible.module_utils.netcfg import CustomNetworkConfig

import re


def execute_show_command(command, module, command_type='cli_show'):
    if module.params['transport'] == 'cli':
        if 'show run' not in command:
            command += ' | json'
        cmds = [command]
        body = run_commands(module, cmds)
    elif module.params['transport'] == 'nxapi':
        cmds = [command]
        body = run_commands(module, cmds)

    return body


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_group_timeout(config):
    command = 'ip igmp snooping group-timeout'
    REGEX = re.compile(r'(?:{0}\s)(?P<value>.*)$'.format(command), re.M)
    value = ''
    if command in config:
        value = REGEX.search(config).group('value')
    return value


def get_snooping(config):
    REGEX = re.compile(r'{0}$'.format('no ip igmp snooping'), re.M)
    value = False
    try:
        if REGEX.search(config):
            value = False
    except TypeError:
        value = True
    return value


def get_igmp_snooping(module):
    command = 'show run all | include igmp.snooping'
    existing = {}
    body = execute_show_command(
        command, module, command_type='cli_show_ascii')[0]

    if body:
        split_body = body.splitlines()

        if 'no ip igmp snooping' in split_body:
            existing['snooping'] = False
        else:
            existing['snooping'] = True

        if 'no ip igmp snooping report-suppression' in split_body:
            existing['report_supp'] = False
        elif 'ip igmp snooping report-suppression' in split_body:
            existing['report_supp'] = True

        if 'no ip igmp snooping link-local-groups-suppression' in split_body:
            existing['link_local_grp_supp'] = False
        elif 'ip igmp snooping link-local-groups-suppression' in split_body:
            existing['link_local_grp_supp'] = True

        if 'ip igmp snooping v3-report-suppression' in split_body:
            existing['v3_report_supp'] = True
        else:
            existing['v3_report_supp'] = False

        existing['group_timeout'] = get_group_timeout(body)

    return existing


def config_igmp_snooping(delta, existing, default=False):
    CMDS = {
        'snooping': 'ip igmp snooping',
        'group_timeout': 'ip igmp snooping group-timeout {}',
        'link_local_grp_supp': 'ip igmp snooping link-local-groups-suppression',
        'v3_report_supp': 'ip igmp snooping v3-report-suppression',
        'report_supp': 'ip igmp snooping report-suppression'
    }

    commands = []
    command = None
    for key, value in delta.items():
        if value:
            if default and key == 'group_timeout':
                if existing.get(key):
                    command = 'no ' + CMDS.get(key).format(existing.get(key))
            else:
                command = CMDS.get(key).format(value)
        else:
            command = 'no ' + CMDS.get(key).format(value)

        if command:
            commands.append(command)
        command = None

    return commands


def get_igmp_snooping_defaults():
    group_timeout = 'dummy'
    report_supp = True
    link_local_grp_supp = True
    v3_report_supp = False
    snooping = True

    args = dict(snooping=snooping, link_local_grp_supp=link_local_grp_supp,
                report_supp=report_supp, v3_report_supp=v3_report_supp,
                group_timeout=group_timeout)

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

    return default


def main():
    argument_spec = dict(
        snooping=dict(required=False, type='bool'),
        group_timeout=dict(required=False, type='str'),
        link_local_grp_supp=dict(required=False, type='bool'),
        report_supp=dict(required=False, type='bool'),
        v3_report_supp=dict(required=False, type='bool'),
        state=dict(choices=['present', 'default'], default='present'),
    )

    argument_spec.update(nxos_argument_spec)

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

    warnings = list()
    check_args(module, warnings)


    snooping = module.params['snooping']
    link_local_grp_supp = module.params['link_local_grp_supp']
    report_supp = module.params['report_supp']
    v3_report_supp = module.params['v3_report_supp']
    group_timeout = module.params['group_timeout']
    state = module.params['state']

    args = dict(snooping=snooping, link_local_grp_supp=link_local_grp_supp,
                report_supp=report_supp, v3_report_supp=v3_report_supp,
                group_timeout=group_timeout)

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

    existing = get_igmp_snooping(module)
    end_state = existing
    changed = False

    commands = []
    if state == 'present':
        delta = dict(
            set(proposed.items()).difference(existing.items())
            )
        if delta:
            command = config_igmp_snooping(delta, existing)
            if command:
                commands.append(command)
    elif state == 'default':
        proposed = get_igmp_snooping_defaults()
        delta = dict(
            set(proposed.items()).difference(existing.items())
            )
        if delta:
            command = config_igmp_snooping(delta, existing, default=True)
            if command:
                commands.append(command)

    cmds = flatten_list(commands)
    results = {}
    if cmds:
        if module.check_mode:
            module.exit_json(changed=True, commands=cmds)
        else:
            changed = True
            load_config(module, cmds)
            end_state = get_igmp_snooping(module)
            if 'configure' in cmds:
                cmds.pop(0)

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

    module.exit_json(**results)

if __name__ == '__main__':
    main()