#!/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_ospf_vrf
extends_documentation_fragment:
- cisco.nxos.nxos
short_description: Manages a VRF for an OSPF router.
description:
- Manages a VRF for an OSPF router.
version_added: 1.0.0
author: Gabriele Gerbino (@GGabriele)
notes:
- Tested against NXOSv 7.3.(0)D1(1) on VIRL
- Value I(default) restores params default value, if any. Otherwise it removes the
  existing param configuration.
options:
  vrf:
    description:
    - Name of the resource instance. Valid value is a string. The name 'default' is
      a valid VRF representing the global OSPF.
    default: default
  ospf:
    description:
    - Name of the OSPF instance.
    required: true
  router_id:
    description:
    - Router Identifier (ID) of the OSPF router VRF instance.
  default_metric:
    description:
    - Specify the default Metric value. Valid values are an integer or the keyword
      'default'.
  log_adjacency:
    description:
    - Controls the level of log messages generated whenever a neighbor changes state.
      Valid values are 'log', 'detail', and 'default'.
    choices:
    - log
    - detail
    - default
  timer_throttle_lsa_start:
    description:
    - Specify the start interval for rate-limiting Link-State Advertisement (LSA)
      generation. Valid values are an integer, in milliseconds, or the keyword 'default'.
  timer_throttle_lsa_hold:
    description:
    - Specify the hold interval for rate-limiting Link-State Advertisement (LSA) generation.
      Valid values are an integer, in milliseconds, or the keyword 'default'.
  timer_throttle_lsa_max:
    description:
    - Specify the max interval for rate-limiting Link-State Advertisement (LSA) generation.
      Valid values are an integer, in milliseconds, or the keyword 'default'.
  timer_throttle_spf_start:
    description:
    - Specify initial Shortest Path First (SPF) schedule delay. Valid values are an
      integer, in milliseconds, or the keyword 'default'.
  timer_throttle_spf_hold:
    description:
    - Specify minimum hold time between Shortest Path First (SPF) calculations. Valid
      values are an integer, in milliseconds, or the keyword 'default'.
  timer_throttle_spf_max:
    description:
    - Specify the maximum wait time between Shortest Path First (SPF) calculations.
      Valid values are an integer, in milliseconds, or the keyword 'default'.
  auto_cost:
    description:
    - Specifies the reference bandwidth used to assign OSPF cost. Valid values are
      an integer, in Mbps, or the keyword 'default'.
  bfd:
    description:
    - Enables BFD on all OSPF interfaces.
    - "Dependency: ''feature bfd''"
    type: str
    choices:
    - enable
    - disable
  passive_interface:
    description:
    - Setting to C(yes) will suppress routing update on interface.
    type: bool
  state:
    description:
    - State of ospf vrf configuration.
    default: present
    choices:
    - present
    - absent
"""

EXAMPLES = """
- cisco.nxos.nxos_ospf_vrf:
    ospf: 1
    timer_throttle_spf_start: 50
    timer_throttle_spf_hold: 1000
    timer_throttle_spf_max: 2000
    timer_throttle_lsa_start: 60
    timer_throttle_lsa_hold: 1100
    timer_throttle_lsa_max: 3000
    vrf: test
    bfd: enable
    state: present
"""

RETURN = """
commands:
    description: commands sent to the device
    returned: always
    type: list
    sample:
      - router ospf 1
      - vrf test
      - bfd
      - timers throttle lsa 60 1100 3000
"""

import re
from ansible_collections.cisco.nxos.plugins.module_utils.network.nxos.nxos import (
    get_config,
    load_config,
)
from ansible_collections.cisco.nxos.plugins.module_utils.network.nxos.nxos import (
    nxos_argument_spec,
)
from ansible.module_utils.basic import AnsibleModule
from ansible_collections.ansible.netcommon.plugins.module_utils.network.common.config import (
    CustomNetworkConfig,
)


BOOL_PARAMS = ["passive_interface"]
PARAM_TO_COMMAND_KEYMAP = {
    "vrf": "vrf",
    "router_id": "router-id",
    "default_metric": "default-metric",
    "log_adjacency": "log-adjacency-changes",
    "timer_throttle_lsa_start": "timers throttle lsa",
    "timer_throttle_lsa_max": "timers throttle lsa",
    "timer_throttle_lsa_hold": "timers throttle lsa",
    "timer_throttle_spf_max": "timers throttle spf",
    "timer_throttle_spf_start": "timers throttle spf",
    "timer_throttle_spf_hold": "timers throttle spf",
    "auto_cost": "auto-cost reference-bandwidth",
    "bfd": "bfd",
    "passive_interface": "passive-interface default",
}
PARAM_TO_DEFAULT_KEYMAP = {
    "timer_throttle_lsa_start": "0",
    "timer_throttle_lsa_max": "5000",
    "timer_throttle_lsa_hold": "5000",
    "timer_throttle_spf_start": "200",
    "timer_throttle_spf_max": "5000",
    "timer_throttle_spf_hold": "1000",
    "auto_cost": "40000",
    "bfd": "disable",
    "default_metric": "",
    "passive_interface": False,
    "router_id": "",
    "log_adjacency": "",
}


def get_existing(module, args):
    existing = {}
    netcfg = CustomNetworkConfig(indent=2, contents=get_config(module))
    parents = ["router ospf {0}".format(module.params["ospf"])]

    if module.params["vrf"] != "default":
        parents.append("vrf {0}".format(module.params["vrf"]))

    config = netcfg.get_section(parents)
    for arg in args:
        if arg not in ["ospf", "vrf"]:
            existing[arg] = PARAM_TO_DEFAULT_KEYMAP.get(arg)

    if config:
        if module.params["vrf"] == "default":
            splitted_config = config.splitlines()
            vrf_index = False
            for index in range(0, len(splitted_config) - 1):
                if "vrf" in splitted_config[index].strip():
                    vrf_index = index
                    break
            if vrf_index:
                config = "\n".join(splitted_config[0:vrf_index])

        splitted_config = config.splitlines()
        for line in splitted_config:
            if "passive" in line:
                existing["passive_interface"] = True
            elif "router-id" in line:
                existing["router_id"] = re.search(
                    r"router-id (\S+)", line
                ).group(1)
            elif "metric" in line:
                existing["default_metric"] = re.search(
                    r"default-metric (\S+)", line
                ).group(1)
            elif "adjacency" in line:
                log = re.search(
                    r"log-adjacency-changes(?: (\S+))?", line
                ).group(1)
                if log:
                    existing["log_adjacency"] = log
                else:
                    existing["log_adjacency"] = "log"
            elif "auto" in line:
                cost = re.search(
                    r"auto-cost reference-bandwidth (\d+) (\S+)", line
                ).group(1)
                if "Gbps" in line:
                    cost = int(cost) * 1000
                existing["auto_cost"] = str(cost)
            elif "bfd" in line:
                existing["bfd"] = "enable"
            elif "timers throttle lsa" in line:
                tmp = re.search(r"timers throttle lsa (\S+) (\S+) (\S+)", line)
                existing["timer_throttle_lsa_start"] = tmp.group(1)
                existing["timer_throttle_lsa_hold"] = tmp.group(2)
                existing["timer_throttle_lsa_max"] = tmp.group(3)
            elif "timers throttle spf" in line:
                tmp = re.search(r"timers throttle spf (\S+) (\S+) (\S+)", line)
                existing["timer_throttle_spf_start"] = tmp.group(1)
                existing["timer_throttle_spf_hold"] = tmp.group(2)
                existing["timer_throttle_spf_max"] = tmp.group(3)
        existing["vrf"] = module.params["vrf"]
        existing["ospf"] = module.params["ospf"]

    return existing


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


def get_timer_prd(key, proposed):
    if proposed.get(key):
        return proposed.get(key)
    else:
        return PARAM_TO_DEFAULT_KEYMAP.get(key)


def state_present(module, existing, proposed, candidate):
    commands = list()
    proposed_commands = apply_key_map(PARAM_TO_COMMAND_KEYMAP, proposed)
    existing_commands = apply_key_map(PARAM_TO_COMMAND_KEYMAP, existing)

    for key, value in proposed_commands.items():
        if key == "vrf":
            continue
        if value is True:
            commands.append(key)

        elif value is False:
            if key == "passive-interface default":
                if existing_commands.get(key):
                    commands.append("no {0}".format(key))
            else:
                commands.append("no {0}".format(key))

        elif value == "default" or value == "":
            if key == "log-adjacency-changes":
                commands.append("no {0}".format(key))
            elif existing_commands.get(key):
                existing_value = existing_commands.get(key)
                commands.append("no {0} {1}".format(key, existing_value))
        else:
            if key == "timers throttle lsa":
                command = "{0} {1} {2} {3}".format(
                    key,
                    get_timer_prd("timer_throttle_lsa_start", proposed),
                    get_timer_prd("timer_throttle_lsa_hold", proposed),
                    get_timer_prd("timer_throttle_lsa_max", proposed),
                )
            elif key == "timers throttle spf":
                command = "{0} {1} {2} {3}".format(
                    key,
                    get_timer_prd("timer_throttle_spf_start", proposed),
                    get_timer_prd("timer_throttle_spf_hold", proposed),
                    get_timer_prd("timer_throttle_spf_max", proposed),
                )
            elif key == "log-adjacency-changes":
                if value == "log":
                    command = key
                elif value == "detail":
                    command = "{0} {1}".format(key, value)
            elif key == "auto-cost reference-bandwidth":
                if len(value) < 5:
                    command = "{0} {1} Mbps".format(key, value)
                else:
                    value = str(int(value) // 1000)
                    command = "{0} {1} Gbps".format(key, value)
            elif key == "bfd":
                command = "no bfd" if value == "disable" else "bfd"
            else:
                command = "{0} {1}".format(key, value.lower())

            if command not in commands:
                commands.append(command)

    if commands:
        parents = ["router ospf {0}".format(module.params["ospf"])]
        if module.params["vrf"] != "default":
            parents.append("vrf {0}".format(module.params["vrf"]))
        candidate.add(commands, parents=parents)


def state_absent(module, existing, proposed, candidate):
    commands = []
    parents = ["router ospf {0}".format(module.params["ospf"])]
    if module.params["vrf"] == "default":
        existing_commands = apply_key_map(PARAM_TO_COMMAND_KEYMAP, existing)
        for key, value in existing_commands.items():
            if value and key != "vrf":
                command = None
                if key == "passive-interface default":
                    command = "no {0}".format(key)
                elif key == "timers throttle lsa":
                    if (
                        existing["timer_throttle_lsa_start"]
                        != PARAM_TO_DEFAULT_KEYMAP.get(
                            "timer_throttle_lsa_start"
                        )
                        or existing["timer_throttle_lsa_hold"]
                        != PARAM_TO_DEFAULT_KEYMAP.get(
                            "timer_throttle_lsa_hold"
                        )
                        or existing["timer_throttle_lsa_max"]
                        != PARAM_TO_DEFAULT_KEYMAP.get(
                            "timer_throttle_lsa_max"
                        )
                    ):
                        command = "no {0} {1} {2} {3}".format(
                            key,
                            existing["timer_throttle_lsa_start"],
                            existing["timer_throttle_lsa_hold"],
                            existing["timer_throttle_lsa_max"],
                        )
                elif key == "timers throttle spf":
                    if (
                        existing["timer_throttle_spf_start"]
                        != PARAM_TO_DEFAULT_KEYMAP.get(
                            "timer_throttle_spf_start"
                        )
                        or existing["timer_throttle_spf_hold"]
                        != PARAM_TO_DEFAULT_KEYMAP.get(
                            "timer_throttle_spf_hold"
                        )
                        or existing["timer_throttle_spf_max"]
                        != PARAM_TO_DEFAULT_KEYMAP.get(
                            "timer_throttle_spf_max"
                        )
                    ):
                        command = "no {0} {1} {2} {3}".format(
                            key,
                            existing["timer_throttle_spf_start"],
                            existing["timer_throttle_spf_hold"],
                            existing["timer_throttle_spf_max"],
                        )
                elif key == "log-adjacency-changes":
                    command = "no {0}".format(key)
                elif key == "auto-cost reference-bandwidth":
                    if value != PARAM_TO_DEFAULT_KEYMAP.get("auto_cost"):
                        command = "no {0}".format(key)
                    else:
                        command = None
                elif key == "bfd":
                    if value == "enable":
                        command = "no bfd"
                else:
                    existing_value = existing_commands.get(key)
                    command = "no {0} {1}".format(key, existing_value)

                if command:
                    if command not in commands:
                        commands.append(command)
    else:
        if existing.get("vrf") and existing.get("vrf") == module.params["vrf"]:
            commands = ["no vrf {0}".format(module.params["vrf"])]

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


def main():
    argument_spec = dict(
        vrf=dict(required=False, type="str", default="default"),
        ospf=dict(required=True, type="str"),
        router_id=dict(required=False, type="str"),
        default_metric=dict(required=False, type="str"),
        log_adjacency=dict(
            required=False, type="str", choices=["log", "detail", "default"]
        ),
        timer_throttle_lsa_start=dict(required=False, type="str"),
        timer_throttle_lsa_hold=dict(required=False, type="str"),
        timer_throttle_lsa_max=dict(required=False, type="str"),
        timer_throttle_spf_start=dict(required=False, type="str"),
        timer_throttle_spf_hold=dict(required=False, type="str"),
        timer_throttle_spf_max=dict(required=False, type="str"),
        auto_cost=dict(required=False, type="str"),
        bfd=dict(required=False, type="str", choices=["enable", "disable"]),
        passive_interface=dict(required=False, type="bool"),
        state=dict(
            choices=["present", "absent"], default="present", required=False
        ),
    )

    argument_spec.update(nxos_argument_spec)

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

    warnings = list()
    result = dict(changed=False, commands=[], warnings=warnings)

    state = module.params["state"]
    args = PARAM_TO_COMMAND_KEYMAP.keys()
    existing = get_existing(module, args)
    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 key != "interface":
            if str(value).lower() == "true":
                value = True
            elif str(value).lower() == "false":
                value = False
            elif str(value).lower() == "default":
                value = PARAM_TO_DEFAULT_KEYMAP.get(key)
                if value is None:
                    value = "default"
            if existing.get(key) != value:
                proposed[key] = value

    candidate = CustomNetworkConfig(indent=3)
    if state == "present":
        state_present(module, existing, proposed, candidate)
    if state == "absent" and existing:
        state_absent(module, existing, proposed, candidate)

    if candidate:
        candidate = candidate.items_text()
        result["commands"] = candidate
        if not module.check_mode:
            load_config(module, candidate)
            result["changed"] = True
    module.exit_json(**result)


if __name__ == "__main__":
    main()
