#!/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/>.
#

DOCUMENTATION = '''
---
module: nxos_pim_rp_address
version_added: "2.2"
short_description: Manages configuration of an PIM static RP address instance.
description:
    - Manages configuration of an Protocol Independent Multicast (PIM) static
      rendezvous point (RP) address instance.
author: Gabriele Gerbino (@GGabriele)
extends_documentation_fragment: nxos
notes:
    - C(state=absent) remove the whole rp-address configuration, if existing.
options:
    rp_address:
        description:
            - Configures a Protocol Independent Multicast (PIM) static
              rendezvous point (RP) address. Valid values are
              unicast addresses.
        required: true
    group_list:
        description:
            - Group range for static RP. Valid values are multicast addresses.
        required: false
        default: null
    prefix_list:
        description:
            - Prefix list policy for static RP. Valid values are prefix-list
              policy names.
        required: false
        default: null
    route_map:
        description:
            - Route map policy for static RP. Valid values are route-map
              policy names.
        required: false
        default: null
    bidir:
        description:
            - Group range is treated in PIM bidirectional mode.
        required: false
        choices: ['true','false']
        default: null
'''
EXAMPLES = '''
- nxos_pim_rp_address:
    rp_address: "10.1.1.20"
    state: present
    username: "{{ un }}"
    password: "{{ pwd }}"
    host: "{{ inventory_hostname }}"
'''

RETURN = '''
proposed:
    description: k/v pairs of parameters passed into module
    returned: verbose mode
    type: dict
    sample: {"rp_address": "10.1.1.21"}
existing:
    description: list of existing pim rp-address configuration entries
    returned: verbose mode
    type: list
    sample: []
end_state:
    description: pim rp-address configuration entries after module execution
    returned: verbose mode
    type: list
    sample: [{"bidir": false, "group_list": "224.0.0.0/4",
            "rp_address": "10.1.1.21"}]
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
'''



# COMMON CODE FOR MIGRATION
import re

from ansible.module_utils.basic import get_exception
from ansible.module_utils.netcfg import NetworkConfig, ConfigLine
from ansible.module_utils.shell import ShellError

try:
    from ansible.module_utils.nxos import get_module
except ImportError:
    from ansible.module_utils.nxos import NetworkModule


def to_list(val):
     if isinstance(val, (list, tuple)):
         return list(val)
     elif val is not None:
         return [val]
     else:
         return list()


class CustomNetworkConfig(NetworkConfig):

    def expand_section(self, configobj, S=None):
        if S is None:
            S = list()
        S.append(configobj)
        for child in configobj.children:
            if child in S:
                continue
            self.expand_section(child, S)
        return S

    def get_object(self, path):
        for item in self.items:
            if item.text == path[-1]:
                parents = [p.text for p in item.parents]
                if parents == path[:-1]:
                    return item

    def to_block(self, section):
        return '\n'.join([item.raw for item in section])

    def get_section(self, path):
        try:
            section = self.get_section_objects(path)
            return self.to_block(section)
        except ValueError:
            return list()

    def get_section_objects(self, path):
        if not isinstance(path, list):
            path = [path]
        obj = self.get_object(path)
        if not obj:
            raise ValueError('path does not exist in config')
        return self.expand_section(obj)


    def add(self, lines, parents=None):
        """Adds one or lines of configuration
        """

        ancestors = list()
        offset = 0
        obj = None

        ## global config command
        if not parents:
            for line in to_list(lines):
                item = ConfigLine(line)
                item.raw = line
                if item not in self.items:
                    self.items.append(item)

        else:
            for index, p in enumerate(parents):
                try:
                    i = index + 1
                    obj = self.get_section_objects(parents[:i])[0]
                    ancestors.append(obj)

                except ValueError:
                    # add parent to config
                    offset = index * self.indent
                    obj = ConfigLine(p)
                    obj.raw = p.rjust(len(p) + offset)
                    if ancestors:
                        obj.parents = list(ancestors)
                        ancestors[-1].children.append(obj)
                    self.items.append(obj)
                    ancestors.append(obj)

            # add child objects
            for line in to_list(lines):
                # check if child already exists
                for child in ancestors[-1].children:
                    if child.text == line:
                        break
                else:
                    offset = len(parents) * self.indent
                    item = ConfigLine(line)
                    item.raw = line.rjust(len(line) + offset)
                    item.parents = ancestors
                    ancestors[-1].children.append(item)
                    self.items.append(item)


def get_network_module(**kwargs):
    try:
        return get_module(**kwargs)
    except NameError:
        return NetworkModule(**kwargs)

def get_config(module, include_defaults=False):
    config = module.params['config']
    if not config:
        try:
            config = module.get_config()
        except AttributeError:
            defaults = module.params['include_defaults']
            config = module.config.get_config(include_defaults=defaults)
    return CustomNetworkConfig(indent=2, contents=config)

def load_config(module, candidate):
    config = get_config(module)

    commands = candidate.difference(config)
    commands = [str(c).strip() for c in commands]

    save_config = module.params['save']

    result = dict(changed=False)

    if commands:
        if not module.check_mode:
            try:
                module.configure(commands)
            except AttributeError:
                module.config(commands)

            if save_config:
                try:
                    module.config.save_config()
                except AttributeError:
                    module.execute(['copy running-config startup-config'])

        result['changed'] = True
        result['updates'] = commands

    return result
# END OF COMMON CODE

BOOL_PARAMS = ['bidir']
PARAM_TO_COMMAND_KEYMAP = {
    'rp_address': 'ip pim rp-address'
}
PARAM_TO_DEFAULT_KEYMAP = {}
WARNINGS = []

def invoke(name, *args, **kwargs):
    func = globals().get(name)
    if func:
        return func(*args, **kwargs)


def get_value(config, module):
    value_list = []
    splitted_config = config.splitlines()
    for line in splitted_config:
        tmp = {}
        if 'ip pim rp-address' in line:
            splitted_line = line.split()
            tmp['rp_address'] = splitted_line[3]
            if len(splitted_line) > 5:
                value = splitted_line[5]
                if splitted_line[4] == 'route-map':
                    tmp['route_map'] = value
                elif splitted_line[4] == 'prefix-list':
                    tmp['prefix_list'] = value
                elif splitted_line[4] == 'group-list':
                    tmp['group_list'] = value
            if 'bidir' in line:
                tmp['bidir'] = True
            else:
                tmp['bidir'] = False
            value_list.append(tmp)
    return value_list


def get_existing(module, args):
    existing = {}
    config = str(get_config(module))
    existing = get_value(config, module)
    return existing


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 state_present(module, existing, proposed, candidate):
    command = 'ip pim rp-address {0}'.format(module.params['rp_address'])
    commands = build_command(proposed, command)
    if commands:
        candidate.add(commands, parents=[])


def build_command(param_dict, command):
    for param in ['group_list', 'prefix_list', 'route_map']:
        if param_dict.get(param):
            command += ' {0} {1}'.format(
                                    param.replace('_', '-'), param_dict.get(param))
    if param_dict.get('bidir'):
        command += ' bidir'
    return [command]


def state_absent(module, existing, proposed, candidate):
    commands = list()
    for each in existing:
        if each.get('rp_address') == proposed['rp_address']:
            command = 'no ip pim rp-address {0}'.format(proposed['rp_address'])
            if each.get('group_list'):
                commands = build_command(each, command)
            else:
                commands = [command]
    if commands:
        candidate.add(commands, parents=[])


def main():
    argument_spec = dict(
            rp_address=dict(required=True, type='str'),
            group_list=dict(required=False, type='str'),
            prefix_list=dict(required=False, type='str'),
            route_map=dict(required=False, type='str'),
            bidir=dict(required=False, type='bool'),
            state=dict(choices=['present', 'absent'], default='present',
                       required=False),
            include_defaults=dict(default=False),
            config=dict(),
            save=dict(type='bool', default=False)
    )
    module = get_network_module(argument_spec=argument_spec,
                                mutually_exclusive=[['group_list', 'route_map'],
                                                    ['group_list', 'prefix_list'],
                                                    ['route_map', 'prefix_list']],
                                supports_check_mode=True)

    state = module.params['state']

    args =  [
            'rp_address',
            'group_list',
            'prefix_list',
            'route_map',
            'bidir'
        ]

    existing = invoke('get_existing', module, args)
    end_state = existing
    proposed_args = dict((k, v) for k, v in module.params.items()
                    if v is not None and k in args)

    proposed = {}
    for key, value in proposed_args.items():
        if str(value).lower() == 'true':
            value = True
        elif str(value).lower() == 'false':
            value = False
        for each in existing:
            if each.get(key) or (not each.get(key) and value):
                proposed[key] = value

    result = {}
    candidate = CustomNetworkConfig(indent=3)
    invoke('state_%s' % state, module, existing, proposed, candidate)

    try:
        response = load_config(module, candidate)
        result.update(response)
    except ShellError:
        exc = get_exception()
        module.fail_json(msg=str(exc))

    result['connected'] = module.connected
    if module._verbosity > 0:
        end_state = invoke('get_existing', module, args)
        result['end_state'] = end_state
        result['existing'] = existing
        result['proposed'] = proposed_args

    if WARNINGS:
        result['warnings'] = WARNINGS

    module.exit_json(**result)


if __name__ == '__main__':
    main()
