#!/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/>.
#
ANSIBLE_METADATA = {'metadata_version': '1.0',
                    'status': ['preview'],
                    'supported_by': 'core'}


DOCUMENTATION = """
---
module: iosxr_facts
version_added: "2.2"
author: "Ricardo Carrillo Cruz (@rcarrillocruz)"
short_description: Collect facts from remote devices running IOS-XR
description:
  - Collects a base set of device facts from a remote device that
    is running iosxr.  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.
extends_documentation_fragment: iosxr
options:
  gather_subset:
    description:
      - When supplied, this argument will restrict the facts collected
        to a given subset.  Possible values for this argument include
        all, hardware, config, and interfaces.  Can specify a list of
        values to include a larger subset.  Values can also be used
        with an initial C(M(!)) to specify that a specific subset should
        not be collected.
    required: false
    default: '!config'
"""

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

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

# Do not collect hardware facts
- iosxr_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_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: string
ansible_net_image:
  description: The image file the device is running
  returned: always
  type: string

# hardware
ansible_net_filesystems:
  description: All file system names available on the device
  returned: when hardware is configured
  type: list
ansible_net_memfree_mb:
  description: The available free memory on the remote device in Mb
  returned: when hardware is configured
  type: int
ansible_net_memtotal_mb:
  description: The total memory on the remote device in Mb
  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 LLDP neighbors from the remote device
  returned: when interfaces is configured
  type: dict
"""
import re

from ansible.module_utils.iosxr import run_commands
from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.six import iteritems
from ansible.module_utils.six.moves import zip
from ansible.module_utils.iosxr import iosxr_argument_spec, check_args


class FactsBase(object):

    def __init__(self):
        self.facts = dict()
        self.commands()

    def commands(self):
        raise NotImplementedError


class Default(FactsBase):

    def commands(self):
        return(['show version brief'])

    def populate(self, results):
        self.facts['version'] = self.parse_version(results['show version brief'])
        self.facts['image'] = self.parse_image(results['show version brief'])
        self.facts['hostname'] = self.parse_hostname(results['show version brief'])

    def parse_version(self, data):
        match = re.search(r'Version (\S+)$', data, re.M)
        if match:
            return match.group(1)

    def parse_hostname(self, data):
        match = re.search(r'^(.+) uptime', data, re.M)
        if match:
            return match.group(1)

    def parse_image(self, data):
        match = re.search(r'image file is "(.+)"', data)
        if match:
            return match.group(1)


class Hardware(FactsBase):

    def commands(self):
        return(['dir /all', 'show memory summary'])

    def populate(self, results):
        self.facts['filesystems'] = self.parse_filesystems(
            results['dir /all'])

        match = re.search(r'Physical Memory (\d+)M total \((\d+)',
            results['show memory summary'])
        if match:
            self.facts['memtotal_mb'] = int(match[0])
            self.facts['memfree_mb'] = int(match[1])

    def parse_filesystems(self, data):
        return re.findall(r'^Directory of (\S+)', data, re.M)


class Config(FactsBase):

    def commands(self):
        return(['show running-config'])

    def populate(self, results):
        self.facts['config'] = results['show running-config']


class Interfaces(FactsBase):

    def commands(self):
        return(['show interfaces', 'show ipv6 interface',
            'show lldp', 'show lldp neighbors detail'])

    def populate(self, results):
        self.facts['all_ipv4_addresses'] = list()
        self.facts['all_ipv6_addresses'] = list()

        interfaces = self.parse_interfaces(results['show interfaces'])
        self.facts['interfaces'] = self.populate_interfaces(interfaces)

        data = results['show ipv6 interface']
        if len(data) > 0:
            data = self.parse_interfaces(data)
            self.populate_ipv6_interfaces(data)

        if 'LLDP is not enabled' not in results['show lldp']:
            neighbors = results['show lldp neighbors detail']
            self.facts['neighbors'] = self.parse_neighbors(neighbors)

    def populate_interfaces(self, interfaces):
        facts = dict()
        for key, value in iteritems(interfaces):
            intf = dict()
            intf['description'] = self.parse_description(value)
            intf['macaddress'] = self.parse_macaddress(value)

            ipv4 = self.parse_ipv4(value)
            intf['ipv4'] = self.parse_ipv4(value)
            if ipv4:
                self.add_ip_address(ipv4['address'], 'ipv4')

            intf['mtu'] = self.parse_mtu(value)
            intf['bandwidth'] = self.parse_bandwidth(value)
            intf['duplex'] = self.parse_duplex(value)
            intf['lineprotocol'] = self.parse_lineprotocol(value)
            intf['operstatus'] = self.parse_operstatus(value)
            intf['type'] = self.parse_type(value)

            facts[key] = intf
        return facts

    def populate_ipv6_interfaces(self, data):
        for key, value in iteritems(data):
            self.facts['interfaces'][key]['ipv6'] = list()
            addresses = re.findall(r'\s+(.+), subnet', value, re.M)
            subnets = re.findall(r', subnet is (.+)$', value, re.M)
            for addr, subnet in zip(addresses, subnets):
                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 parse_neighbors(self, neighbors):
        facts = dict()
        nbors = neighbors.split('------------------------------------------------')
        for entry in nbors[1:]:
            if entry == '':
                continue
            intf = self.parse_lldp_intf(entry)
            if intf not in facts:
                facts[intf] = list()
            fact = dict()
            fact['host'] = self.parse_lldp_host(entry)
            fact['port'] = self.parse_lldp_port(entry)
            facts[intf].append(fact)
        return facts

    def parse_interfaces(self, data):
        parsed = dict()
        key = ''
        for line in data.split('\n'):
            if len(line) == 0:
                continue
            elif line[0] == ' ':
                parsed[key] += '\n%s' % line
            else:
                match = re.match(r'^(\S+)', line)
                if match:
                    key = match.group(1)
                    parsed[key] = line
        return parsed

    def parse_description(self, data):
        match = re.search(r'Description: (.+)$', data, re.M)
        if match:
            return match.group(1)

    def parse_macaddress(self, data):
        match = re.search(r'address is (\S+)', data)
        if match:
            return match.group(1)

    def parse_ipv4(self, data):
        match = re.search(r'Internet address is (\S+)/(\d+)', data)
        if match:
            addr = match.group(1)
            masklen = int(match.group(2))
            return dict(address=addr, masklen=masklen)

    def parse_mtu(self, data):
        match = re.search(r'MTU (\d+)', data)
        if match:
            return int(match.group(1))

    def parse_bandwidth(self, data):
        match = re.search(r'BW (\d+)', data)
        if match:
            return int(match.group(1))

    def parse_duplex(self, data):
        match = re.search(r'(\w+) Duplex', data, re.M)
        if match:
            return match.group(1)

    def parse_type(self, data):
        match = re.search(r'Hardware is (.+),', data, re.M)
        if match:
            return match.group(1)

    def parse_lineprotocol(self, data):
        match = re.search(r'line protocol is (.+)\s+?$', data, re.M)
        if match:
            return match.group(1)

    def parse_operstatus(self, data):
        match = re.search(r'^(?:.+) is (.+),', data, re.M)
        if match:
            return match.group(1)

    def parse_lldp_intf(self, data):
        match = re.search(r'^Local Interface: (.+)$', data, re.M)
        if match:
            return match.group(1)

    def parse_lldp_host(self, data):
        match = re.search(r'System Name: (.+)$', data, re.M)
        if match:
            return match.group(1)

    def parse_lldp_port(self, data):
        match = re.search(r'Port id: (.+)$', 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())


def main():
    spec = dict(
        gather_subset=dict(default=['!config'], type='list')
    )

    spec.update(iosxr_argument_spec)

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

    warnings = list()
    check_args(module, warnings)

    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')

        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]())

    try:
        for inst in instances:
            commands = inst.commands()
            responses = run_commands(module, commands)
            results = dict(zip(commands, responses))
            inst.populate(results)
            facts.update(inst.facts)
    except Exception:
        module.exit_json(out=module.from_json(results))

    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()
