#!/usr/bin/python
# -*- coding: utf-8 -*-

# (c) 2017, Ansible by Red Hat, inc
#
# This file is part of Ansible by Red Hat
#
# 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: vyos_logging
version_added: "2.4"
author: "Trishna Guha (@trishnaguha)"
short_description: Manage logging on network devices
description:
  - This module provides declarative management of logging
    on Vyatta Vyos devices.
notes:
  - Tested against VyOS 1.1.8 (helium).
  - This module works with connection C(network_cli). See L(the VyOS OS Platform Options,../network/user_guide/platform_vyos.html).
options:
  dest:
    description:
      - Destination of the logs.
    choices: ['console', 'file', 'global', 'host', 'user']
  name:
    description:
      - If value of C(dest) is I(file) it indicates file-name,
        for I(user) it indicates username and for I(host) indicates
        the host name to be notified.
  facility:
    description:
      - Set logging facility.
  level:
    description:
      - Set logging severity levels.
  aggregate:
    description: List of logging definitions.
  state:
    description:
      - State of the logging configuration.
    default: present
    choices: ['present', 'absent']
extends_documentation_fragment: vyos
"""

EXAMPLES = """
- name: configure console logging
  vyos_logging:
    dest: console
    facility: all
    level: crit

- name: remove console logging configuration
  vyos_logging:
    dest: console
    state: absent

- name: configure file logging
  vyos_logging:
    dest: file
    name: test
    facility: local3
    level: err

- name: Add logging aggregate
  vyos_logging:
    aggregate:
      - { dest: file, name: test1, facility: all, level: info }
      - { dest: file, name: test2, facility: news, level: debug }
    state: present

- name: Remove logging aggregate
  vyos_logging:
    aggregate:
      - { dest: console, facility: all, level: info }
      - { dest: console, facility: daemon, level: warning }
      - { dest: file, name: test2, facility: news, level: debug }
    state: absent
"""

RETURN = """
commands:
  description: The list of configuration mode commands to send to the device
  returned: always
  type: list
  sample:
    - set system syslog global facility all level notice
"""

import re

from copy import deepcopy

from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.network.common.utils import remove_default_spec
from ansible_collections.vyos.vyos.plugins.module_utils.network.vyos.vyos import (
    get_config,
    load_config,
)
from ansible_collections.vyos.vyos.plugins.module_utils.network.vyos.vyos import (
    vyos_argument_spec,
)


def spec_to_commands(updates, module):
    commands = list()
    want, have = updates

    for w in want:
        dest = w["dest"]
        name = w["name"]
        facility = w["facility"]
        level = w["level"]
        state = w["state"]
        del w["state"]

        if state == "absent" and w in have:
            if w["name"]:
                commands.append(
                    "delete system syslog {0} {1} facility {2} level {3}".format(
                        dest, name, facility, level
                    )
                )
            else:
                commands.append(
                    "delete system syslog {0} facility {1} level {2}".format(
                        dest, facility, level
                    )
                )
        elif state == "present" and w not in have:
            if w["name"]:
                commands.append(
                    "set system syslog {0} {1} facility {2} level {3}".format(
                        dest, name, facility, level
                    )
                )
            else:
                commands.append(
                    "set system syslog {0} facility {1} level {2}".format(
                        dest, facility, level
                    )
                )

    return commands


def config_to_dict(module):
    data = get_config(module)
    obj = []

    for line in data.split("\n"):
        if line.startswith("set system syslog"):
            match = re.search(r"set system syslog (\S+)", line, re.M)
            dest = match.group(1)
            if dest == "host":
                match = re.search(r"host (\S+)", line, re.M)
                name = match.group(1)
            elif dest == "file":
                match = re.search(r"file (\S+)", line, re.M)
                name = match.group(1)
            elif dest == "user":
                match = re.search(r"user (\S+)", line, re.M)
                name = match.group(1)
            else:
                name = None

            if "facility" in line:
                match = re.search(r"facility (\S+)", line, re.M)
                facility = match.group(1)
            if "level" in line:
                match = re.search(r"level (\S+)", line, re.M)
                level = match.group(1).strip("'")

                obj.append(
                    {
                        "dest": dest,
                        "name": name,
                        "facility": facility,
                        "level": level,
                    }
                )

    return obj


def map_params_to_obj(module, required_if=None):
    obj = []

    aggregate = module.params.get("aggregate")
    if aggregate:
        for item in aggregate:
            for key in item:
                if item.get(key) is None:
                    item[key] = module.params[key]

            module._check_required_if(required_if, item)
            obj.append(item.copy())

    else:
        if module.params["dest"] not in ("host", "file", "user"):
            module.params["name"] = None

        obj.append(
            {
                "dest": module.params["dest"],
                "name": module.params["name"],
                "facility": module.params["facility"],
                "level": module.params["level"],
                "state": module.params["state"],
            }
        )

    return obj


def main():
    """ main entry point for module execution
    """
    element_spec = dict(
        dest=dict(
            type="str", choices=["console", "file", "global", "host", "user"]
        ),
        name=dict(type="str"),
        facility=dict(type="str"),
        level=dict(type="str"),
        state=dict(default="present", choices=["present", "absent"]),
    )

    aggregate_spec = deepcopy(element_spec)

    # remove default in aggregate spec, to handle common arguments
    remove_default_spec(aggregate_spec)

    argument_spec = dict(
        aggregate=dict(type="list", elements="dict", options=aggregate_spec)
    )

    argument_spec.update(element_spec)

    argument_spec.update(vyos_argument_spec)
    required_if = [
        ("dest", "host", ["name", "facility", "level"]),
        ("dest", "file", ["name", "facility", "level"]),
        ("dest", "user", ["name", "facility", "level"]),
        ("dest", "console", ["facility", "level"]),
        ("dest", "global", ["facility", "level"]),
    ]

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

    warnings = list()

    result = {"changed": False}
    if warnings:
        result["warnings"] = warnings
    want = map_params_to_obj(module, required_if=required_if)
    have = config_to_dict(module)

    commands = spec_to_commands((want, have), module)
    result["commands"] = commands

    if commands:
        commit = not module.check_mode
        load_config(module, commands, commit=commit)
        result["changed"] = True

    module.exit_json(**result)


if __name__ == "__main__":
    main()