#!/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': '1.1',
                    'status': ['preview'],
                    'supported_by': 'community'}

DOCUMENTATION = '''
---
module: ce_ntp
version_added: "2.4"
short_description: Manages core NTP configuration on HUAWEI CloudEngine switches.
description:
    - Manages core NTP configuration on HUAWEI CloudEngine switches.
author:
    - Zhijin Zhou (@CloudEngine-Ansible)
options:
    server:
        description:
            - Network address of NTP server.
        required: false
        default: null
    peer:
        description:
            - Network address of NTP peer.
        required: false
        default: null
    key_id:
        description:
            - Authentication key identifier to use with given NTP server or peer.
        required: false
        default: null
    is_preferred:
        description:
            - Makes given NTP server or peer the preferred NTP server or peer for the device.
        required: false
        default: null
        choices: ['enable', 'disable']
    vpn_name:
        description:
            - Makes the device communicate with the given
              NTP server or peer over a specific vpn.
        required: false
        default: '_public_'
    source_int:
        description:
            - Local source interface from which NTP messages are sent.
              Must be fully qualified interface name, i.e. C(40GE1/0/22), C(vlanif10).
              Interface types, such as C(10GE), C(40GE), C(100GE), C(Eth-Trunk), C(LoopBack),
              C(MEth), C(NULL), C(Tunnel), C(Vlanif).
        required: false
        default: null
    state:
        description:
            - Manage the state of the resource.
        required: false
        default: present
        choices: ['present','absent']
'''

EXAMPLES = '''
- name: NTP test
  hosts: cloudengine
  connection: local
  gather_facts: no
  vars:
    cli:
      host: "{{ inventory_hostname }}"
      port: "{{ ansible_ssh_port }}"
      username: "{{ username }}"
      password: "{{ password }}"
      transport: cli

  tasks:

  - name: "Set NTP Server with parameters"
    ce_ntp:
      server: 192.8.2.6
      vpn_name: js
      source_int: vlanif4001
      is_preferred: enable
      key_id: 32
      provider: "{{ cli }}"

  - name: "Set NTP Peer with parameters"
    ce_ntp:
      peer: 192.8.2.6
      vpn_name: js
      source_int: vlanif4001
      is_preferred: enable
      key_id: 32
      provider: "{{ cli }}"
'''

RETURN = '''
proposed:
    description: k/v pairs of parameters passed into module
    returned: always
    type: dict
    sample: {"server": "2.2.2.2",        "key_id": "48",
             "is_preferred": "enable",     "vpn_name":"js",
             "source_int": "vlanif4002", "state":"present"}
existing:
    description: k/v pairs of existing ntp server/peer
    returned: always
    type: dict
    sample: {"server": "2.2.2.2",        "key_id": "32",
            "is_preferred": "disable",     "vpn_name":"js",
            "source_int": "vlanif4002"}
end_state:
    description: k/v pairs of ntp info after module execution
    returned: always
    type: dict
    sample: {"server": "2.2.2.2",        "key_id": "48",
             "is_preferred": "enable",     "vpn_name":"js",
             "source_int": "vlanif4002"}
updates:
    description: command sent to the device
    returned: always
    type: list
    sample: ["ntp server 2.2.2.2 authentication-keyid 48 source-interface vlanif4002 vpn-instance js preferred"]
changed:
    description: check to see if a change was made on the device
    returned: always
    type: boolean
    sample: true
'''

import re
from xml.etree import ElementTree
from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.network.cloudengine.ce import ce_argument_spec, get_nc_config, set_nc_config

CE_NC_GET_NTP_CONFIG = """
<filter type="subtree">
  <ntp xmlns="http://www.huawei.com/netconf/vrp" content-version="1.0" format-version="1.0">
    <ntpUCastCfgs>
      <ntpUCastCfg>
        <addrFamily></addrFamily>
        <vpnName></vpnName>
        <ifName></ifName>
        <ipv4Addr></ipv4Addr>
        <ipv6Addr></ipv6Addr>
        <type></type>
        <isPreferred></isPreferred>
        <keyId></keyId>
      </ntpUCastCfg>
    </ntpUCastCfgs>
  </ntp>
</filter>
"""

CE_NC_MERGE_NTP_CONFIG = """
<config>
  <ntp xmlns="http://www.huawei.com/netconf/vrp" content-version="1.0" format-version="1.0">
    <ntpUCastCfgs>
      <ntpUCastCfg operation="merge">
        <addrFamily>%s</addrFamily>
        <ipv4Addr>%s</ipv4Addr>
        <ipv6Addr>%s</ipv6Addr>
        <type>%s</type>
        <vpnName>%s</vpnName>
        <keyId>%s</keyId>
        <isPreferred>%s</isPreferred>
        <ifName>%s</ifName>
        <neid>0-0</neid>
      </ntpUCastCfg>
    </ntpUCastCfgs>
  </ntp>
</config>
"""

CE_NC_DELETE_NTP_CONFIG = """
<config>
  <ntp xmlns="http://www.huawei.com/netconf/vrp" content-version="1.0" format-version="1.0">
    <ntpUCastCfgs>
      <ntpUCastCfg operation="delete">
        <addrFamily>%s</addrFamily>
        <ipv4Addr>%s</ipv4Addr>
        <ipv6Addr>%s</ipv6Addr>
        <type>%s</type>
        <vpnName>%s</vpnName>
        <neid>0-0</neid>
      </ntpUCastCfg>
    </ntpUCastCfgs>
  </ntp>
</config>
"""


def get_interface_type(interface):
    """Gets the type of interface, such as 10GE, ETH-TRUNK, VLANIF..."""

    if interface is None:
        return None

    iftype = None

    if interface.upper().startswith('GE'):
        iftype = 'ge'
    elif interface.upper().startswith('10GE'):
        iftype = '10ge'
    elif interface.upper().startswith('25GE'):
        iftype = '25ge'
    elif interface.upper().startswith('4X10GE'):
        iftype = '4x10ge'
    elif interface.upper().startswith('40GE'):
        iftype = '40ge'
    elif interface.upper().startswith('100GE'):
        iftype = '100ge'
    elif interface.upper().startswith('VLANIF'):
        iftype = 'vlanif'
    elif interface.upper().startswith('LOOPBACK'):
        iftype = 'loopback'
    elif interface.upper().startswith('METH'):
        iftype = 'meth'
    elif interface.upper().startswith('ETH-TRUNK'):
        iftype = 'eth-trunk'
    elif interface.upper().startswith('VBDIF'):
        iftype = 'vbdif'
    elif interface.upper().startswith('NVE'):
        iftype = 'nve'
    elif interface.upper().startswith('TUNNEL'):
        iftype = 'tunnel'
    elif interface.upper().startswith('ETHERNET'):
        iftype = 'ethernet'
    elif interface.upper().startswith('FCOE-PORT'):
        iftype = 'fcoe-port'
    elif interface.upper().startswith('FABRIC-PORT'):
        iftype = 'fabric-port'
    elif interface.upper().startswith('STACK-PORT'):
        iftype = 'stack-Port'
    elif interface.upper().startswith('NULL'):
        iftype = 'null'
    else:
        return None

    return iftype.lower()


class Ntp(object):
    """Ntp class"""

    def __init__(self, argument_spec):
        self.spec = argument_spec
        self.module = None
        self.mutually_exclusive = [('server', 'peer')]
        self.init_module()

        # ntp configration info
        self.server = self.module.params['server'] or None
        self.peer = self.module.params['peer'] or None
        self.key_id = self.module.params['key_id']
        self.is_preferred = self.module.params['is_preferred']
        self.vpn_name = self.module.params['vpn_name']
        self.interface = self.module.params['source_int'] or ""
        self.state = self.module.params['state']
        self.ntp_conf = dict()
        self.conf_exsit = False
        self.ip_ver = 'IPv4'

        if self.server:
            self.peer_type = 'Server'
            self.address = self.server
        elif self.peer:
            self.peer_type = 'Peer'
            self.address = self.peer
        else:
            self.peer_type = None
            self.address = None

        self.check_params()

        # state
        self.changed = False
        self.updates_cmd = list()
        self.results = dict()
        self.proposed = dict()
        self.existing = list()
        self.end_state = list()

        self.init_data()

    def init_data(self):
        """Init data"""

        if self.interface is not None:
            self.interface = self.interface.lower()

        if not self.key_id:
            self.key_id = ""

        if not self.is_preferred:
            self.is_preferred = 'disable'

    def init_module(self):
        """Init module"""

        required_one_of = [("server", "peer")]
        self.module = AnsibleModule(
            argument_spec=self.spec,
            supports_check_mode=True,
            required_one_of=required_one_of,
            mutually_exclusive=self.mutually_exclusive
        )

    def check_ipaddr_validate(self):
        """Check ipaddress validate"""

        rule1 = r'(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\.'
        rule2 = r'(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])'
        ipv4_regex = '%s%s%s%s%s%s' % ('^', rule1, rule1, rule1, rule2, '$')
        ipv6_regex = '^(?:[a-fA-F0-9]{1,4}:){7}[a-fA-F0-9]{1,4}$'

        flag = False
        if bool(re.match(ipv4_regex, self.address)):
            flag = True
            self.ip_ver = "IPv4"
            if not self.ntp_ucast_ipv4_validate():
                flag = False
        elif bool(re.match(ipv6_regex, self.address)):
            flag = True
            self.ip_ver = "IPv6"
        else:
            flag = True
            self.ip_ver = "IPv6"

        if not flag:
            if self.peer_type == "Server":
                self.module.fail_json(msg='Error: Illegal server ip-address.')
            else:
                self.module.fail_json(msg='Error: Illegal peer ip-address.')

    def ntp_ucast_ipv4_validate(self):
        """Check ntp ucast ipv4 address"""

        addr_list = re.findall(r'(.*)\.(.*)\.(.*)\.(.*)', self.address)
        if not addr_list:
            self.module.fail_json(msg='Error: Match ip-address fail.')

        value = ((int(addr_list[0][0])) * 0x1000000) + (int(addr_list[0][1]) * 0x10000) + \
            (int(addr_list[0][2]) * 0x100) + (int(addr_list[0][3]))
        if (value & (0xff000000) == 0x7f000000) or (value & (0xF0000000) == 0xF0000000) \
                or (value & (0xF0000000) == 0xE0000000) or (value == 0):
            return False
        return True

    def check_params(self):
        """Check all input params"""

        # check interface type
        if self.interface:
            intf_type = get_interface_type(self.interface)
            if not intf_type:
                self.module.fail_json(
                    msg='Error: Interface name of %s '
                        'is error.' % self.interface)

        if self.vpn_name:
            if (len(self.vpn_name) < 1) or (len(self.vpn_name) > 31):
                self.module.fail_json(
                    msg='Error: VPN name length is beetween 1 and 31.')

        if self.address:
            self.check_ipaddr_validate()

    def check_response(self, xml_str, xml_name):
        """Check if response message is already succeed."""

        if "<ok/>" not in xml_str:
            self.module.fail_json(msg='Error: %s failed.' % xml_name)

    def set_ntp(self, *args):
        """Configure ntp parameters"""

        if self.state == 'present':
            if self.ip_ver == 'IPv4':
                xml_str = CE_NC_MERGE_NTP_CONFIG % (
                    args[0], args[1], '::', args[2], args[3], args[4], args[5], args[6])
            elif self.ip_ver == 'IPv6':
                xml_str = CE_NC_MERGE_NTP_CONFIG % (
                    args[0], '0.0.0.0', args[1], args[2], args[3], args[4], args[5], args[6])
            ret_xml = set_nc_config(self.module, xml_str)
            self.check_response(ret_xml, "NTP_CORE_CONFIG")
        else:
            if self.ip_ver == 'IPv4':
                xml_str = CE_NC_DELETE_NTP_CONFIG % (
                    args[0], args[1], '::', args[2], args[3])
            elif self.ip_ver == 'IPv6':
                xml_str = CE_NC_DELETE_NTP_CONFIG % (
                    args[0], '0.0.0.0', args[1], args[2], args[3])
            ret_xml = set_nc_config(self.module, xml_str)
            self.check_response(ret_xml, "UNDO_NTP_CORE_CONFIG")

    def config_ntp(self):
        """Config ntp"""

        if self.state == "present":
            if self.address and not self.conf_exsit:
                if self.is_preferred == 'enable':
                    is_preferred = 'true'
                else:
                    is_preferred = 'false'
                self.set_ntp(self.ip_ver, self.address, self.peer_type,
                             self.vpn_name, self.key_id, is_preferred, self.interface)
                self.changed = True
        else:
            if self.address:
                self.set_ntp(self.ip_ver, self.address,
                             self.peer_type, self.vpn_name, '', '', '')
                self.changed = True

    def show_result(self):
        """Show result"""

        self.results['changed'] = self.changed
        self.results['proposed'] = self.proposed
        self.results['existing'] = self.existing
        self.results['end_state'] = self.end_state
        if self.changed:
            self.results['updates'] = self.updates_cmd
        else:
            self.results['updates'] = list()

        self.module.exit_json(**self.results)

    def get_ntp_exist_config(self):
        """Get ntp existed configure"""

        ntp_config = list()
        conf_str = CE_NC_GET_NTP_CONFIG
        con_obj = get_nc_config(self.module, conf_str)
        if "<data/>" in con_obj:
            return ntp_config

        xml_str = con_obj.replace('\r', '').replace('\n', '').\
            replace('xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"', "").\
            replace('xmlns="http://www.huawei.com/netconf/vrp"', "")

        # get all ntp config info
        root = ElementTree.fromstring(xml_str)
        ntpsite = root.findall("data/ntp/ntpUCastCfgs/ntpUCastCfg")
        for nexthop in ntpsite:
            ntp_dict = dict()
            for ele in nexthop:
                if ele.tag in ["addrFamily", "vpnName", "ifName", "ipv4Addr",
                               "ipv6Addr", "type", "isPreferred", "keyId"]:
                    ntp_dict[ele.tag] = ele.text

            ip_addr = ntp_dict['ipv6Addr']
            if ntp_dict['addrFamily'] == "IPv4":
                ip_addr = ntp_dict['ipv4Addr']
            if ntp_dict['ifName'] is None:
                ntp_dict['ifName'] = ""
            if ntp_dict['isPreferred'] == 'true':
                is_preferred = 'enable'
            else:
                is_preferred = 'disable'

            if self.state == "present":
                key_id = ntp_dict['keyId'] or ""
                cur_ntp_cfg = dict(vpn_name=ntp_dict['vpnName'], source_int=ntp_dict['ifName'].lower(), address=ip_addr,
                                   peer_type=ntp_dict['type'], prefer=is_preferred, key_id=key_id)
                exp_ntp_cfg = dict(vpn_name=self.vpn_name, source_int=self.interface.lower(), address=self.address,
                                   peer_type=self.peer_type, prefer=self.is_preferred, key_id=self.key_id)
                if cur_ntp_cfg == exp_ntp_cfg:
                    self.conf_exsit = True

            vpn_name = ntp_dict['vpnName']
            if ntp_dict['vpnName'] == "_public_":
                vpn_name = None

            if_name = ntp_dict['ifName']
            if if_name == "":
                if_name = None
            if self.peer_type == 'Server':
                ntp_config.append(dict(vpn_name=vpn_name,
                                       source_int=if_name, server=ip_addr,
                                       is_preferred=is_preferred, key_id=ntp_dict['keyId']))
            else:
                ntp_config.append(dict(vpn_name=vpn_name,
                                       source_int=if_name, peer=ip_addr,
                                       is_preferred=is_preferred, key_id=ntp_dict['keyId']))

        return ntp_config

    def get_existing(self):
        """Get existing info"""

        if self.address:
            self.existing = self.get_ntp_exist_config()

    def get_proposed(self):
        """Get proposed info"""

        if self.address:
            vpn_name = self.vpn_name
            if vpn_name == "_public_":
                vpn_name = None

            if_name = self.interface
            if if_name == "":
                if_name = None

            key_id = self.key_id
            if key_id == "":
                key_id = None
            if self.peer_type == 'Server':
                self.proposed = dict(state=self.state, vpn_name=vpn_name,
                                     source_int=if_name, server=self.address,
                                     is_preferred=self.is_preferred, key_id=key_id)
            else:
                self.proposed = dict(state=self.state, vpn_name=vpn_name,
                                     source_int=if_name, peer=self.address,
                                     is_preferred=self.is_preferred, key_id=key_id)

    def get_end_state(self):
        """Get end state info"""

        if self.address:
            self.end_state = self.get_ntp_exist_config()

    def get_update_cmd(self):
        """Get updated commands"""

        if self.conf_exsit:
            return

        cli_str = ""
        if self.state == "present":
            if self.address:
                if self.peer_type == 'Server':
                    if self.ip_ver == "IPv4":
                        cli_str = "%s %s" % (
                            "ntp unicast-server", self.address)
                    else:
                        cli_str = "%s %s" % (
                            "ntp unicast-server ipv6", self.address)
                elif self.peer_type == 'Peer':
                    if self.ip_ver == "IPv4":
                        cli_str = "%s %s" % ("ntp unicast-peer", self.address)
                    else:
                        cli_str = "%s %s" % (
                            "ntp unicast-peer ipv6", self.address)

                if self.key_id:
                    cli_str = "%s %s %s" % (
                        cli_str, "authentication-keyid", self.key_id)
                if self.interface:
                    cli_str = "%s %s %s" % (
                        cli_str, "source-interface", self.interface)
                if (self.vpn_name) and (self.vpn_name != '_public_'):
                    cli_str = "%s %s %s" % (
                        cli_str, "vpn-instance", self.vpn_name)
                if self.is_preferred == "enable":
                    cli_str = "%s %s" % (cli_str, "preferred")
        else:
            if self.address:
                if self.peer_type == 'Server':
                    if self.ip_ver == "IPv4":
                        cli_str = "%s %s" % (
                            "undo ntp unicast-server", self.address)
                    else:
                        cli_str = "%s %s" % (
                            "undo ntp unicast-server ipv6", self.address)
                elif self.peer_type == 'Peer':
                    if self.ip_ver == "IPv4":
                        cli_str = "%s %s" % (
                            "undo ntp unicast-peer", self.address)
                    else:
                        cli_str = "%s %s" % (
                            "undo ntp unicast-peer ipv6", self.address)
                if (self.vpn_name) and (self.vpn_name != '_public_'):
                    cli_str = "%s %s" % (cli_str, self.vpn_name)

        self.updates_cmd.append(cli_str)

    def work(self):
        """Excute task"""

        self.get_existing()
        self.get_proposed()

        self.config_ntp()

        self.get_update_cmd()
        self.get_end_state()
        self.show_result()


def main():
    """Main function entry"""

    argument_spec = dict(
        server=dict(type='str'),
        peer=dict(type='str'),
        key_id=dict(type='str'),
        is_preferred=dict(type='str', choices=['enable', 'disable']),
        vpn_name=dict(type='str', default='_public_'),
        source_int=dict(type='str'),
        state=dict(choices=['absent', 'present'], default='present'),
    )
    argument_spec.update(ce_argument_spec)
    ntp_obj = Ntp(argument_spec)
    ntp_obj.work()


if __name__ == '__main__':
    main()
