#!/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_pim_rp_address
extends_documentation_fragment:
- cisco.nxos.nxos
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.
version_added: 1.0.0
author: Gabriele Gerbino (@GGabriele)
notes:
- Tested against NXOSv 7.3.(0)D1(1) on VIRL
- Unsupported for Cisco MDS
- C(state=absent) is currently not supported on all platforms.
options:
  rp_address:
    description:
    - Configures a Protocol Independent Multicast (PIM) static rendezvous point (RP)
      address. Valid values are unicast addresses.
    required: true
    type: str
  group_list:
    description:
    - Group range for static RP. Valid values are multicast addresses.
    type: str
  prefix_list:
    description:
    - Prefix list policy for static RP. Valid values are prefix-list policy names.
    type: str
  route_map:
    description:
    - Route map policy for static RP. Valid values are route-map policy names.
    type: str
  bidir:
    description:
    - Group range is treated in PIM bidirectional mode.
    type: bool
  state:
    description:
    - Specify desired state of the resource.
    default: present
    choices:
    - present
    - absent
    type: str
"""
EXAMPLES = """
- cisco.nxos.nxos_pim_rp_address:
    rp_address: 10.1.1.20
    state: present
"""

RETURN = """
commands:
    description: commands sent to the device
    returned: always
    type: list
    sample: ["router bgp 65535", "vrf test", "router-id 192.0.2.1"]
"""


import re

from ansible.module_utils.basic import AnsibleModule
from ansible_collections.ansible.netcommon.plugins.module_utils.network.common.config import (
    CustomNetworkConfig,
)

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


def get_existing(module, args, gl):
    existing = {}
    config = str(get_config(module))
    address = module.params["rp_address"]

    pim_address_re = r"ip pim rp-address (?P<value>.*)$"
    for line in re.findall(pim_address_re, config, re.M):
        values = line.split()
        if values[0] != address:
            continue
        if gl and "group-list" not in line:
            continue
        elif not gl and "group-list" in line:
            if "224.0.0.0/4" not in line:  # ignore default group-list
                continue

        existing["bidir"] = existing.get("bidir") or "bidir" in line
        if len(values) > 2:
            value = values[2]
            if values[1] == "route-map":
                existing["route_map"] = value
            elif values[1] == "prefix-list":
                existing["prefix_list"] = value
            elif values[1] == "group-list":
                if value != "224.0.0.0/4":  # ignore default group-list
                    existing["group_list"] = value

    return existing


def state_present(module, existing, proposed, candidate):
    address = module.params["rp_address"]
    command = "ip pim rp-address {0}".format(address)
    if module.params["group_list"] and not proposed.get("group_list"):
        command += " group-list " + module.params["group_list"]
    if module.params["prefix_list"]:
        if not proposed.get("prefix_list"):
            command += " prefix-list " + module.params["prefix_list"]
    if module.params["route_map"]:
        if not proposed.get("route_map"):
            command += " route-map " + module.params["route_map"]
    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, candidate):
    address = module.params["rp_address"]

    commands = []
    command = "no ip pim rp-address {0}".format(address)
    if module.params["group_list"] == existing.get("group_list"):
        commands = build_command(existing, command)
    elif not module.params["group_list"]:
        commands = [command]

    if commands:
        candidate.add(commands, parents=[])


def get_proposed(pargs, existing):
    proposed = {}

    for key, value in pargs.items():
        if key != "rp_address":
            if str(value).lower() == "true":
                value = True
            elif str(value).lower() == "false":
                value = False

            if existing.get(key) != value:
                proposed[key] = value

    return proposed


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),
    )

    module = AnsibleModule(
        argument_spec=argument_spec,
        mutually_exclusive=[
            ["group_list", "route_map"],
            ["group_list", "prefix_list"],
            ["route_map", "prefix_list"],
        ],
        supports_check_mode=True,
    )

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

    state = module.params["state"]

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

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

    if module.params["group_list"]:
        existing = get_existing(module, args, True)
        proposed = get_proposed(proposed_args, existing)

    else:
        existing = get_existing(module, args, False)
        proposed = get_proposed(proposed_args, existing)

    candidate = CustomNetworkConfig(indent=3)
    if state == "present" and (proposed or not existing):
        state_present(module, existing, proposed, candidate)
    elif state == "absent" and existing:
        state_absent(module, existing, candidate)

    if candidate:
        candidate = candidate.items_text()
        result["commands"] = candidate
        result["changed"] = True
        msgs = load_config(module, candidate, True)
        if msgs:
            for item in msgs:
                if item:
                    if isinstance(item, dict):
                        err_str = item["clierror"]
                    else:
                        err_str = item
                    if "No policy was configured" in err_str:
                        if state == "absent":
                            addr = module.params["rp_address"]
                            new_cmd = "no ip pim rp-address {0}".format(addr)
                            load_config(module, new_cmd)

    module.exit_json(**result)


if __name__ == "__main__":
    main()