#!/usr/bin/python

# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)

from __future__ import (absolute_import, division, print_function)
__metaclass__ = type

ANSIBLE_METADATA = {'metadata_version': '1.1',
                    'status': ['preview'],
                    'supported_by': 'community'}


DOCUMENTATION = """
---
module: routeros_facts
version_added: "2.8"
author: "Egor Zaitsev (@heuels)"
short_description: Collect facts from remote devices running MikroTik RouterOS
description:
  - Collects a base set of device facts from a remote device that
    is running RotuerOS.  This module prepends all of the
    base network fact keys with C(ansible_net_<fact>).  The facts
    module will always collect a base set of facts from the device
    and can enable or disable collection of additional facts.
options:
  gather_subset:
    description:
      - When supplied, this argument will restrict the facts collected
        to a given subset.  Possible values for this argument include
        C(all), C(hardware), C(config), and C(interfaces).  Can specify a list of
        values to include a larger subset.  Values can also be used
        with an initial C(!) to specify that a specific subset should
        not be collected.
    required: false
    default: '!config'
"""

EXAMPLES = """
# Collect all facts from the device
- routeros_facts:
    gather_subset: all

# Collect only the config and default facts
- routeros_facts:
    gather_subset:
      - config

# Do not collect hardware facts
- routeros_facts:
    gather_subset:
      - "!hardware"
"""

RETURN = """
ansible_net_gather_subset:
  description: The list of fact subsets collected from the device
  returned: always
  type: list

# default
ansible_net_model:
  description: The model name returned from the device
  returned: always
  type: str
ansible_net_serialnum:
  description: The serial number of the remote device
  returned: always
  type: str
ansible_net_version:
  description: The operating system version running on the remote device
  returned: always
  type: str
ansible_net_hostname:
  description: The configured hostname of the device
  returned: always
  type: str

# hardware
ansible_net_spacefree_mb:
  description: The available disk space on the remote device in MiB
  returned: when hardware is configured
  type: dict
ansible_net_spacetotal_mb:
  description: The total disk space on the remote device in MiB
  returned: when hardware is configured
  type: dict
ansible_net_memfree_mb:
  description: The available free memory on the remote device in MiB
  returned: when hardware is configured
  type: int
ansible_net_memtotal_mb:
  description: The total memory on the remote device in MiB
  returned: when hardware is configured
  type: int

# config
ansible_net_config:
  description: The current active config from the device
  returned: when config is configured
  type: str

# interfaces
ansible_net_all_ipv4_addresses:
  description: All IPv4 addresses configured on the device
  returned: when interfaces is configured
  type: list
ansible_net_all_ipv6_addresses:
  description: All IPv6 addresses configured on the device
  returned: when interfaces is configured
  type: list
ansible_net_interfaces:
  description: A hash of all interfaces running on the system
  returned: when interfaces is configured
  type: dict
ansible_net_neighbors:
  description: The list of neighbors from the remote device
  returned: when interfaces is configured
  type: dict
"""
import re

from ansible.module_utils.network.routeros.routeros import run_commands
from ansible.module_utils.network.routeros.routeros import routeros_argument_spec
from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.six import iteritems


class FactsBase(object):

    COMMANDS = list()

    def __init__(self, module):
        self.module = module
        self.facts = dict()
        self.responses = None

    def populate(self):
        self.responses = run_commands(self.module, commands=self.COMMANDS, check_rc=False)

    def run(self, cmd):
        return run_commands(self.module, commands=cmd, check_rc=False)


class Default(FactsBase):

    COMMANDS = [
        '/system identity print without-paging',
        '/system resource print without-paging',
        '/system routerboard print without-paging'
    ]

    def populate(self):
        super(Default, self).populate()
        data = self.responses[0]
        if data:
            self.facts['hostname'] = self.parse_hostname(data)

        data = self.responses[1]
        if data:
            self.facts['version'] = self.parse_version(data)

        data = self.responses[2]
        if data:
            self.facts['model'] = self.parse_model(data)
            self.facts['serialnum'] = self.parse_serialnum(data)

    def parse_hostname(self, data):
        match = re.search(r'name:\s(.*)\s*$', data, re.M)
        if match:
            return match.group(1)

    def parse_version(self, data):
        match = re.search(r'version:\s(.*)\s*$', data, re.M)
        if match:
            return match.group(1)

    def parse_model(self, data):
        match = re.search(r'model:\s(.*)\s*$', data, re.M)
        if match:
            return match.group(1)

    def parse_serialnum(self, data):
        match = re.search(r'serial-number:\s(.*)\s*$', data, re.M)
        if match:
            return match.group(1)


class Hardware(FactsBase):

    COMMANDS = [
        '/system resource print without-paging'
    ]

    def populate(self):
        super(Hardware, self).populate()
        data = self.responses[0]
        if data:
            self.parse_filesystem_info(data)
            self.parse_memory_info(data)

    def parse_filesystem_info(self, data):
        match = re.search(r'free-hdd-space:\s(.*)([KMG]iB)', data, re.M)
        if match:
            self.facts['spacefree_mb'] = self.to_megabytes(match)
        match = re.search(r'total-hdd-space:\s(.*)([KMG]iB)', data, re.M)
        if match:
            self.facts['spacetotal_mb'] = self.to_megabytes(match)

    def parse_memory_info(self, data):
        match = re.search(r'free-memory:\s(\d+\.?\d*)([KMG]iB)', data, re.M)
        if match:
            self.facts['memfree_mb'] = self.to_megabytes(match)
        match = re.search(r'total-memory:\s(\d+\.?\d*)([KMG]iB)', data, re.M)
        if match:
            self.facts['memtotal_mb'] = self.to_megabytes(match)

    def to_megabytes(self, data):
        if data.group(2) == 'KiB':
            return float(data.group(1)) / 1024
        elif data.group(2) == 'MiB':
            return float(data.group(1))
        elif data.group(2) == 'GiB':
            return float(data.group(1)) * 1024
        else:
            return None


class Config(FactsBase):

    COMMANDS = ['/export']

    def populate(self):
        super(Config, self).populate()
        data = self.responses[0]
        if data:
            self.facts['config'] = data


class Interfaces(FactsBase):

    COMMANDS = [
        '/interface print detail without-paging',
        '/ip address print detail without-paging',
        '/ipv6 address print detail without-paging',
        '/ip neighbor print detail without-paging'
    ]

    DETAIL_RE = re.compile(r'([\w\d\-]+)=\"?(\w{3}/\d{2}/\d{4}\s\d{2}:\d{2}:\d{2}|[\w\d\-\.:/]+)')

    def populate(self):
        super(Interfaces, self).populate()

        self.facts['interfaces'] = dict()
        self.facts['all_ipv4_addresses'] = list()
        self.facts['all_ipv6_addresses'] = list()
        self.facts['neighbors'] = dict()

        data = self.responses[0]
        if data:
            interfaces = self.parse_interfaces(data)
            self.populate_interfaces(interfaces)

        data = self.responses[1]
        if data:
            data = self.parse_addresses(data)
            self.populate_ipv4_interfaces(data)

        data = self.responses[2]
        if data:
            data = self.parse_addresses(data)
            self.populate_ipv6_interfaces(data)

        data = self.responses[3]
        if data:
            self.facts['neighbors'] = self.parse_neighbors(data)

    def populate_interfaces(self, data):
        for key, value in iteritems(data):
            self.facts['interfaces'][key] = value

    def populate_ipv4_interfaces(self, data):
        for key, value in iteritems(data):
            if 'ipv4' not in self.facts['interfaces'][key]:
                self.facts['interfaces'][key]['ipv4'] = list()
            addr, subnet = value['address'].split("/")
            ipv4 = dict(address=addr.strip(), subnet=subnet.strip())
            self.add_ip_address(addr.strip(), 'ipv4')
            self.facts['interfaces'][key]['ipv4'].append(ipv4)

    def populate_ipv6_interfaces(self, data):
        for key, value in iteritems(data):
            if 'ipv6' not in self.facts['interfaces'][key]:
                self.facts['interfaces'][key]['ipv6'] = list()
            addr, subnet = value['address'].split("/")
            ipv6 = dict(address=addr.strip(), subnet=subnet.strip())
            self.add_ip_address(addr.strip(), 'ipv6')
            self.facts['interfaces'][key]['ipv6'].append(ipv6)

    def add_ip_address(self, address, family):
        if family == 'ipv4':
            self.facts['all_ipv4_addresses'].append(address)
        else:
            self.facts['all_ipv6_addresses'].append(address)

    def preprocess(self, data):
        preprocessed = list()
        for line in data.split('\n'):
            if len(line) == 0 or line[:5] == 'Flags':
                continue
            elif re.match(r'\s\d', line[:2]):
                preprocessed.append(line[2:])
            else:
                preprocessed[-1] += line
        return preprocessed

    def parse_interfaces(self, data):
        facts = dict()
        data = self.preprocess(data)
        for line in data:
            name = self.parse_name(line)
            facts[name] = dict()
            for (key, value) in re.findall(self.DETAIL_RE, line):
                facts[name][key] = value
        return facts

    def parse_addresses(self, data):
        facts = dict()
        data = self.preprocess(data)
        for line in data:
            name = self.parse_interface(line)
            facts[name] = dict()
            for (key, value) in re.findall(self.DETAIL_RE, line):
                facts[name][key] = value
        return facts

    def parse_neighbors(self, data):
        facts = dict()
        data = self.preprocess(data)
        for line in data:
            name = self.parse_interface(line)
            facts[name] = dict()
            for (key, value) in re.findall(self.DETAIL_RE, line):
                facts[name][key] = value
        return facts

    def parse_name(self, data):
        match = re.search(r'name=\"([\w\d\-]+)\"', data, re.M)
        if match:
            return match.group(1)

    def parse_interface(self, data):
        match = re.search(r'interface=([\w\d\-]+)', data, re.M)
        if match:
            return match.group(1)


FACT_SUBSETS = dict(
    default=Default,
    hardware=Hardware,
    interfaces=Interfaces,
    config=Config,
)

VALID_SUBSETS = frozenset(FACT_SUBSETS.keys())

warnings = list()


def main():
    """main entry point for module execution
    """
    argument_spec = dict(
        gather_subset=dict(default=['!config'], type='list')
    )

    argument_spec.update(routeros_argument_spec)

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

    gather_subset = module.params['gather_subset']

    runable_subsets = set()
    exclude_subsets = set()

    for subset in gather_subset:
        if subset == 'all':
            runable_subsets.update(VALID_SUBSETS)
            continue

        if subset.startswith('!'):
            subset = subset[1:]
            if subset == 'all':
                exclude_subsets.update(VALID_SUBSETS)
                continue
            exclude = True
        else:
            exclude = False

        if subset not in VALID_SUBSETS:
            module.fail_json(msg='Bad subset: %s' % subset)

        if exclude:
            exclude_subsets.add(subset)
        else:
            runable_subsets.add(subset)

    if not runable_subsets:
        runable_subsets.update(VALID_SUBSETS)

    runable_subsets.difference_update(exclude_subsets)
    runable_subsets.add('default')

    facts = dict()
    facts['gather_subset'] = list(runable_subsets)

    instances = list()
    for key in runable_subsets:
        instances.append(FACT_SUBSETS[key](module))

    for inst in instances:
        inst.populate()
        facts.update(inst.facts)

    ansible_facts = dict()
    for key, value in iteritems(facts):
        key = 'ansible_net_%s' % key
        ansible_facts[key] = value

    module.exit_json(ansible_facts=ansible_facts, warnings=warnings)


if __name__ == '__main__':
    main()
