#!/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_info_center_log
version_added: "2.4"
short_description: Manages information center log configuration on HUAWEI CloudEngine switches.
description:
    - Setting the Timestamp Format of Logs.
      Configuring the Device to Output Logs to the Log Buffer.
author: QijunPan (@QijunPan)
options:
    log_time_stamp:
        description:
            - Sets the timestamp format of logs.
        choices: ['date_boot', 'date_second', 'date_tenthsecond', 'date_millisecond',
                  'shortdate_second', 'shortdate_tenthsecond', 'shortdate_millisecond',
                  'formatdate_second', 'formatdate_tenthsecond', 'formatdate_millisecond']
    log_buff_enable:
        description:
            - Enables the Switch to send logs to the log buffer.
        default: no_use
        choices: ['no_use','true', 'false']
    log_buff_size:
        description:
            - Specifies the maximum number of logs in the log buffer.
              The value is an integer that ranges from 0 to 10240. If logbuffer-size is 0, logs are not displayed.
    module_name:
        description:
            - Specifies the name of a module.
              The value is a module name in registration logs.
    channel_id:
        description:
            - Specifies a channel ID.
              The value is an integer ranging from 0 to 9.
    log_enable:
        description:
            - Indicates whether log filtering is enabled.
        default: no_use
        choices: ['no_use','true', 'false']
    log_level:
        description:
            - Specifies a log severity.
        choices: ['emergencies', 'alert', 'critical', 'error',
                  'warning', 'notification', 'informational', 'debugging']
    state:
        description:
            - Determines whether the config should be present or not
              on the device.
        default: present
        choices: ['present', 'absent']
"""

EXAMPLES = '''

- name: CloudEngine info center log 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: "Setting the timestamp format of logs"
    ce_info_center_log:
      log_time_stamp: date_tenthsecond
      provider: "{{ cli }}"

  - name: "Enabled to output information to the log buffer"
    ce_info_center_log:
      log_buff_enable: true
      provider: "{{ cli }}"

  - name: "Set the maximum number of logs in the log buffer"
    ce_info_center_log:
      log_buff_size: 100
      provider: "{{ cli }}"

  - name: "Set a rule for outputting logs to a channel"
    ce_info_center_log:
      module_name: aaa
      channel_id: 1
      log_enable: true
      log_level: critical
      provider: "{{ cli }}"
'''

RETURN = '''
proposed:
    description: k/v pairs of parameters passed into module
    returned: verbose mode
    type: dict
    sample: {"log_time_stamp": "date_tenthsecond", "state": "present"}
existing:
    description: k/v pairs of existing configuration
    returned: verbose mode
    type: dict
    sample: {"log_time_stamp": "date_second"}
end_state:
    description: k/v pairs of configuration after module execution
    returned: verbose mode
    type: dict
    sample: {"log_time_stamp": "date_tenthsecond"}
updates:
    description: commands sent to the device
    returned: always
    type: list
    sample: ["info-center timestamp log date precision-time tenth-second"]
changed:
    description: check to see if a change was made on the device
    returned: always
    type: bool
    sample: true
'''

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


CE_NC_GET_LOG = """
<filter type="subtree">
  <syslog xmlns="http://www.huawei.com/netconf/vrp" content-version="1.0" format-version="1.0">
    <globalParam>
      <bufferSize></bufferSize>
      <logTimeStamp></logTimeStamp>
      <icLogBuffEn></icLogBuffEn>
    </globalParam>
    <icSources>
      <icSource>
        <moduleName>%s</moduleName>
        <icChannelId>%s</icChannelId>
        <icChannelName></icChannelName>
        <logEnFlg></logEnFlg>
        <logEnLevel></logEnLevel>
      </icSource>
    </icSources>
  </syslog>
</filter>
"""

CE_NC_GET_LOG_GLOBAL = """
<filter type="subtree">
  <syslog xmlns="http://www.huawei.com/netconf/vrp" content-version="1.0" format-version="1.0">
    <globalParam>
      <bufferSize></bufferSize>
      <logTimeStamp></logTimeStamp>
      <icLogBuffEn></icLogBuffEn>
    </globalParam>
  </syslog>
</filter>
"""

TIME_STAMP_DICT = {"date_boot": "boot",
                   "date_second": "date precision-time second",
                   "date_tenthsecond": "date precision-time tenth-second",
                   "date_millisecond": "date precision-time millisecond",
                   "shortdate_second": "short-date precision-time second",
                   "shortdate_tenthsecond": "short-date precision-time tenth-second",
                   "shortdate_millisecond": "short-date precision-time millisecond",
                   "formatdate_second": "format-date precision-time second",
                   "formatdate_tenthsecond": "format-date precision-time tenth-second",
                   "formatdate_millisecond": "format-date precision-time millisecond"}

CHANNEL_DEFAULT_LOG_STATE = {"0": "true",
                             "1": "true",
                             "2": "true",
                             "3": "false",
                             "4": "true",
                             "5": "false",
                             "6": "true",
                             "7": "true",
                             "8": "true",
                             "9": "true"}

CHANNEL_DEFAULT_LOG_LEVEL = {"0": "warning",
                             "1": "warning",
                             "2": "informational",
                             "3": "informational",
                             "4": "warning",
                             "5": "debugging",
                             "6": "debugging",
                             "7": "warning",
                             "8": "debugging",
                             "9": "debugging"}


class InfoCenterLog(object):
    """
    Manages information center log configuration
    """

    def __init__(self, argument_spec):
        self.spec = argument_spec
        self.module = None
        self.init_module()

        # module input info
        self.log_time_stamp = self.module.params['log_time_stamp']
        self.log_buff_enable = self.module.params['log_buff_enable']
        self.log_buff_size = self.module.params['log_buff_size']
        self.module_name = self.module.params['module_name']
        self.channel_id = self.module.params['channel_id']
        self.log_enable = self.module.params['log_enable']
        self.log_level = self.module.params['log_level']
        self.state = self.module.params['state']

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

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

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

    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 get_log_dict(self):
        """ log config dict"""

        log_dict = dict()
        if self.module_name:
            if self.module_name.lower() == "default":
                conf_str = CE_NC_GET_LOG % (self.module_name.lower(), self.channel_id)
            else:
                conf_str = CE_NC_GET_LOG % (self.module_name.upper(), self.channel_id)
        else:
            conf_str = CE_NC_GET_LOG_GLOBAL

        xml_str = get_nc_config(self.module, conf_str)
        if "<data/>" in xml_str:
            return log_dict

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

        # get global param info
        glb = root.find("data/syslog/globalParam")
        if glb:
            for attr in glb:
                if attr.tag in ["bufferSize", "logTimeStamp", "icLogBuffEn"]:
                    log_dict[attr.tag] = attr.text

        # get info-center source info
        log_dict["source"] = dict()
        src = root.find("data/syslog/icSources/icSource")
        if src:
            for attr in src:
                if attr.tag in ["moduleName", "icChannelId", "icChannelName", "logEnFlg", "logEnLevel"]:
                    log_dict["source"][attr.tag] = attr.text

        return log_dict

    def config_log_global(self):
        """config log global param"""

        xml_str = '<globalParam operation="merge">'
        if self.log_time_stamp:
            if self.state == "present" and self.log_time_stamp.upper() != self.log_dict.get("logTimeStamp"):
                xml_str += '<logTimeStamp>%s</logTimeStamp>' % self.log_time_stamp.upper()
                self.updates_cmd.append(
                    "info-center timestamp log %s" % TIME_STAMP_DICT.get(self.log_time_stamp))
            elif self.state == "absent" and self.log_time_stamp.upper() == self.log_dict.get("logTimeStamp"):
                xml_str += '<logTimeStamp>DATE_SECOND</logTimeStamp>'  # set default
                self.updates_cmd.append("undo info-center timestamp log")
            else:
                pass

        if self.log_buff_enable != 'no_use':
            if self.log_dict.get("icLogBuffEn") != self.log_buff_enable:
                xml_str += '<icLogBuffEn>%s</icLogBuffEn>' % self.log_buff_enable
                if self.log_buff_enable == "true":
                    self.updates_cmd.append("info-center logbuffer")
                else:
                    self.updates_cmd.append("undo info-center logbuffer")

        if self.log_buff_size:
            if self.state == "present" and self.log_dict.get("bufferSize") != self.log_buff_size:
                xml_str += '<bufferSize>%s</bufferSize>' % self.log_buff_size
                self.updates_cmd.append(
                    "info-center logbuffer size %s" % self.log_buff_size)
            elif self.state == "absent" and self.log_dict.get("bufferSize") == self.log_buff_size:
                xml_str += '<bufferSize>512</bufferSize>'
                self.updates_cmd.append("undo info-center logbuffer size")

        if xml_str == '<globalParam operation="merge">':
            return ""
        else:
            xml_str += '</globalParam>'
            return xml_str

    def config_log_soruce(self):
        """config info-center sources"""

        xml_str = ''
        if not self.module_name or not self.channel_id:
            return xml_str

        source = self.log_dict["source"]
        if self.state == "present":
            xml_str = '<icSources><icSource operation="merge">'
            cmd = 'info-center source %s channel %s log' % (
                self.module_name, self.channel_id)
        else:
            if not source or self.module_name != source.get("moduleName").lower() or \
                    self.channel_id != source.get("icChannelId"):
                return ''

            if self.log_enable == 'no_use' and not self.log_level:
                xml_str = '<icSources><icSource operation="delete">'
            else:
                xml_str = '<icSources><icSource operation="merge">'
            cmd = 'undo info-center source %s channel %s log' % (
                self.module_name, self.channel_id)

        xml_str += '<moduleName>%s</moduleName><icChannelId>%s</icChannelId>' % (
            self.module_name, self.channel_id)

        # log_enable
        if self.log_enable != 'no_use':
            if self.state == "present" and (not source or self.log_enable != source.get("logEnFlg")):
                xml_str += '<logEnFlg>%s</logEnFlg>' % self.log_enable
                if self.log_enable == "true":
                    cmd += ' state on'
                else:
                    cmd += ' state off'
            elif self.state == "absent" and source and self.log_level == source.get("logEnLevel"):
                xml_str += '<logEnFlg>%s</logEnFlg>' % CHANNEL_DEFAULT_LOG_STATE.get(self.channel_id)
                cmd += ' state'

        # log_level
        if self.log_level:
            if self.state == "present" and (not source or self.log_level != source.get("logEnLevel")):
                xml_str += '<logEnLevel>%s</logEnLevel>' % self.log_level
                cmd += ' level %s' % self.log_level
            elif self.state == "absent" and source and self.log_level == source.get("logEnLevel"):
                xml_str += '<logEnLevel>%s</logEnLevel>' % CHANNEL_DEFAULT_LOG_LEVEL.get(self.channel_id)
                cmd += ' level'

        if xml_str.endswith("</icChannelId>"):
            if self.log_enable == 'no_use' and not self.log_level and self.state == "absent":
                xml_str += '</icSource></icSources>'
                self.updates_cmd.append(cmd)
                return xml_str
            else:
                return ''
        else:
            xml_str += '</icSource></icSources>'
            self.updates_cmd.append(cmd)
            return xml_str

    def netconf_load_config(self, xml_str):
        """load log config by netconf"""

        if not xml_str:
            return

        xml_cfg = """
            <config>
            <syslog xmlns="http://www.huawei.com/netconf/vrp" content-version="1.0" format-version="1.0">
            %s
            </syslog>
            </config>""" % xml_str

        recv_xml = set_nc_config(self.module, xml_cfg)
        self.check_response(recv_xml, "SET_LOG")
        self.changed = True

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

        # check log_buff_size ranges from 0 to 10240
        if self.log_buff_size:
            if not self.log_buff_size.isdigit():
                self.module.fail_json(
                    msg="Error: log_buff_size is not digit.")
            if int(self.log_buff_size) < 0 or int(self.log_buff_size) > 10240:
                self.module.fail_json(
                    msg="Error: log_buff_size is not ranges from 0 to 10240.")

        # check channel_id ranging from 0 to 9
        if self.channel_id:
            if not self.channel_id.isdigit():
                self.module.fail_json(msg="Error: channel_id is not digit.")
            if int(self.channel_id) < 0 or int(self.channel_id) > 9:
                self.module.fail_json(
                    msg="Error: channel_id is not ranges from 0 to 9.")

        # module_name and channel_id must be set at the same time
        if bool(self.module_name) != bool(self.channel_id):
            self.module.fail_json(
                msg="Error: module_name and channel_id must be set at the same time.")

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

        if self.log_time_stamp:
            self.proposed["log_time_stamp"] = self.log_time_stamp
        if self.log_buff_enable != 'no_use':
            self.proposed["log_buff_enable"] = self.log_buff_enable
        if self.log_buff_size:
            self.proposed["log_buff_size"] = self.log_buff_size
        if self.module_name:
            self.proposed["module_name"] = self.module_name
        if self.channel_id:
            self.proposed["channel_id"] = self.channel_id
        if self.log_enable != 'no_use':
            self.proposed["log_enable"] = self.log_enable
        if self.log_level:
            self.proposed["log_level"] = self.log_level
        self.proposed["state"] = self.state

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

        if not self.log_dict:
            return

        if self.log_time_stamp:
            self.existing["log_time_stamp"] = self.log_dict.get("logTimeStamp").lower()
        if self.log_buff_enable != 'no_use':
            self.existing["log_buff_enable"] = self.log_dict.get("icLogBuffEn")
        if self.log_buff_size:
            self.existing["log_buff_size"] = self.log_dict.get("bufferSize")
        if self.module_name:
            self.existing["source"] = self.log_dict.get("source")

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

        log_dict = self.get_log_dict()
        if not log_dict:
            return

        if self.log_time_stamp:
            self.end_state["log_time_stamp"] = log_dict.get("logTimeStamp").lower()
        if self.log_buff_enable != 'no_use':
            self.end_state["log_buff_enable"] = log_dict.get("icLogBuffEn")
        if self.log_buff_size:
            self.end_state["log_buff_size"] = log_dict.get("bufferSize")
        if self.module_name:
            self.end_state["source"] = log_dict.get("source")

    def work(self):
        """worker"""

        self.check_params()
        self.log_dict = self.get_log_dict()
        self.get_existing()
        self.get_proposed()

        # deal present or absent
        xml_str = ''
        if self.log_time_stamp or self.log_buff_enable != 'no_use' or self.log_buff_size:
            xml_str += self.config_log_global()

        if self.module_name:
            xml_str += self.config_log_soruce()

        if xml_str:
            self.netconf_load_config(xml_str)
            self.changed = True

        self.get_end_state()
        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 main():
    """Module main"""

    argument_spec = dict(
        log_time_stamp=dict(required=False, type='str',
                            choices=['date_boot', 'date_second', 'date_tenthsecond', 'date_millisecond',
                                     'shortdate_second', 'shortdate_tenthsecond', 'shortdate_millisecond',
                                     'formatdate_second', 'formatdate_tenthsecond', 'formatdate_millisecond']),
        log_buff_enable=dict(type='str', default='no_use', choices=['no_use', 'true', 'false']),
        log_buff_size=dict(required=False, type='str'),
        module_name=dict(required=False, type='str'),
        channel_id=dict(required=False, type='str'),
        log_enable=dict(type='str', default='no_use', choices=['no_use', 'true', 'false']),
        log_level=dict(required=False, type='str',
                       choices=['emergencies', 'alert', 'critical', 'error',
                                'warning', 'notification', 'informational', 'debugging']),
        state=dict(required=False, default='present',
                   choices=['present', 'absent'])
    )

    argument_spec.update(ce_argument_spec)
    module = InfoCenterLog(argument_spec)
    module.work()


if __name__ == '__main__':
    main()
