# -*- coding: utf-8 -*-
# BSD 2-Clause License
#
# Apprise - Push Notification Library.
# Copyright (c) 2024, Chris Caron <lead2gold@gmail.com>
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice,
#    this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
#    this list of conditions and the following disclaimer in the documentation
#    and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.

# Splunk On-Call
# API: https://portal.victorops.com/public/api-docs.html
# Main: https://www.splunk.com/en_us/products/on-call.html
# Routing Keys https://help.victorops.com/knowledge-base/routing-keys/
# Setup: https://help.victorops.com/knowledge-base/rest-endpoint-integration\
#       -guide/


import re
import requests
from json import dumps

from .base import NotifyBase
from ..common import NotifyType, NOTIFY_TYPES
from ..utils import validate_regex
from ..locale import gettext_lazy as _


class SplunkAction:
    """
    Tracks the actions supported by Apprise Splunk Plugin

    """
    # Use mapping (specify :key=arg to over-ride)
    MAP = 'map'

    # Creates a timeline event but does not trigger an incident
    INFO = 'info'

    # Triggers a warning (possibly causing incident) in all cases
    WARNING = 'warning'

    # Triggers an incident in all cases
    CRITICAL = 'critical'

    # Acknowldege entity_id provided in all cases
    ACKNOWLEDGE = 'acknowledgement'

    # Recovery entity_id provided in all cases
    RECOVERY = 'recovery'

    # Resolve (aliase of Recover)
    RESOLVE = 'resolve'


# Define our Splunk Actions
SPLUNK_ACTIONS = (
    SplunkAction.MAP,
    SplunkAction.INFO,
    SplunkAction.ACKNOWLEDGE,
    SplunkAction.WARNING,
    SplunkAction.RECOVERY,
    SplunkAction.RESOLVE,
    SplunkAction.CRITICAL,
)


class SplunkMessageType:
    """
    Defines the supported splunk message types
    """
    # Triggers an incident
    CRITICAL = 'CRITICAL'

    # May trigger an incident, depending on your settings
    WARNING = 'WARNING'

    # Acks an incident
    ACKNOWLEDGEMENT = 'ACKNOWLEDGEMENT'

    # Creates a timeline event but does not trigger an incident
    INFO = 'INFO'

    # Resolves an incident
    RECOVERY = 'RECOVERY'


# Defines our supported message types
SPLUNK_MESSAGE_TYPES = (
    SplunkMessageType.CRITICAL,
    SplunkMessageType.WARNING,
    SplunkMessageType.ACKNOWLEDGEMENT,
    SplunkMessageType.INFO,
    SplunkMessageType.RECOVERY,
)


class NotifySplunk(NotifyBase):
    """
    A wrapper for Splunk Notifications
    """

    # The default descriptive name associated with the Notification
    service_name = _('Splunk On-Call')

    # The services URL
    service_url = 'https://www.splunk.com/en_us/products/on-call.html'

    # The default secure protocol
    secure_protocol = ('splunk', 'victorops')

    # A URL that takes you to the setup/help of the specific protocol
    setup_url = 'https://github.com/caronc/apprise/wiki/Notify_splunk'

    # Notification URL
    notify_url = 'https://alert.victorops.com/integrations/generic/20131114/'\
                 'alert/{apikey}/{routing_key}'

    # Define object templates
    templates = (
        '{schema}://{routing_key}@{apikey}',
        '{schema}://{routing_key}@{apikey}/{entity_id}',
    )

    # The title is not used
    title_maxlen = 60

    # body limit
    body_maxlen = 400

    # Defines our default message mapping
    splunk_message_map = {
        # Creates a timeline event but doesnot trigger an incident
        NotifyType.INFO: SplunkMessageType.INFO,
        # Resolves an incident
        NotifyType.SUCCESS: SplunkMessageType.RECOVERY,
        # May trigger an incident, depending on your settings
        NotifyType.WARNING: SplunkMessageType.WARNING,
        # Triggers an incident
        NotifyType.FAILURE: SplunkMessageType.CRITICAL,
    }

    # Define our tokens; these are the minimum tokens required required to
    # be passed into this function (as arguments). The syntax appends any
    # previously defined in the base package and builds onto them
    template_tokens = dict(NotifyBase.template_tokens, **{
        'apikey': {
            'name': _('API Key'),
            'type': 'string',
            'private': True,
            'required': True,
            'regex': (r'^[A-Z0-9_-]+$', 'i'),
        },
        'routing_key': {
            'name': _('Target Routing Key'),
            'type': 'string',
            'required': True,
            'regex': (r'^[A-Z0-9_-]+$', 'i'),
        },
        'entity_id': {
            # Provide a value such as: "disk space/db01.mycompany.com"
            'name': _('Entity ID'),
            'type': 'string',
        },
    })

    # Define our template arguments
    template_args = dict(NotifyBase.template_args, **{
        'apikey': {
            'alias_of': 'apikey',
        },
        'routing_key': {
            'alias_of': 'routing_key',
        },
        'route': {
            'alias_of': 'routing_key',
        },
        'entity_id': {
            'alias_of': 'entity_id',
        },
        'action': {
            'name': _('Action'),
            'type': 'choice:string',
            'values': SPLUNK_ACTIONS,
            'default': SPLUNK_ACTIONS[0],
        }
    })

    # Define any kwargs we're using
    template_kwargs = {
        'mapping': {
            'name': _('Action Mapping'),
            'prefix': ':',
        },
    }

    def __init__(self, apikey, routing_key, entity_id=None, action=None,
                 mapping=None, **kwargs):
        """
        Initialize Splunk Object
        """
        super().__init__(**kwargs)

        self.apikey = validate_regex(
            apikey, *self.template_tokens['apikey']['regex'])
        if not self.apikey:
            msg = 'The Splunk API Key specified ({}) is invalid.'\
                .format(apikey)
            self.logger.warning(msg)
            raise TypeError(msg)

        self.routing_key = validate_regex(
            routing_key, *self.template_tokens['routing_key']['regex'])
        if not self.routing_key:
            msg = 'The Splunk Routing Key specified ({}) is invalid.'\
                .format(routing_key)
            self.logger.warning(msg)
            raise TypeError(msg)

        if not (isinstance(entity_id, str)
                and len(entity_id.strip(' \r\n\t\v/'))):
            # Use routing key
            self.entity_id = f"{self.app_id}/{self.routing_key}"

        else:
            # Assign what was defined:
            self.entity_id = entity_id.strip(' \r\n\t\v/')

        if isinstance(action, str) and action:
            self.action = next(
                (a for a in SPLUNK_ACTIONS if a.startswith(action)), None)
            if self.action not in SPLUNK_ACTIONS:
                msg = 'The Splunk action specified ({}) is invalid.'\
                    .format(action)
                self.logger.warning(msg)
                raise TypeError(msg)
        else:
            self.action = self.template_args['action']['default'] \

        # Store our mappings
        self.mapping = self.splunk_message_map.copy()
        if mapping and isinstance(mapping, dict):
            for _k, _v in mapping.items():
                # Get our mapping
                k = next((t for t in NOTIFY_TYPES if t.startswith(_k)), None)
                if not k:
                    msg = 'The Splunk mapping key specified ({}) is invalid.'\
                        .format(_k)
                    self.logger.warning(msg)
                    raise TypeError(msg)

                _v_upper = _v.upper()
                v = next((v for v in SPLUNK_MESSAGE_TYPES
                          if v.startswith(_v_upper)), None)
                if not v:
                    msg = 'The Splunk mapping value (assigned to {}) ' \
                          'specified ({}) is invalid.'.format(k, _v)
                    self.logger.warning(msg)
                    raise TypeError(msg)

                # Update our mapping
                self.mapping[k] = v

        return

    def send(self, body, title='', notify_type=NotifyType.INFO, **kwargs):
        """
        Send our notification
        """

        # prepare our headers
        headers = {
            'User-Agent': self.app_id,
            'Content-Type': "application/json",
        }

        # Set up our message type
        if self.action == SplunkAction.MAP:
            # Use Mapping
            message_type = self.mapping[notify_type]

        elif self.action == SplunkAction.ACKNOWLEDGE:
            # Always Acknowledge
            message_type = SplunkMessageType.ACKNOWLEDGEMENT

        elif self.action == SplunkAction.INFO:
            # Creates a timeline event but does not trigger an incident
            message_type = SplunkMessageType.INFO

        elif self.action == SplunkAction.CRITICAL:
            # Always create Incident
            message_type = SplunkMessageType.CRITICAL

        elif self.action == SplunkAction.WARNING:
            # Always trigger warning (potentially creating incident)
            message_type = SplunkMessageType.WARNING

        else:  # self.action == SplunkAction.RECOVERY or SplunkAction.RESOLVE
            # Always Recover
            message_type = SplunkMessageType.RECOVERY

        # Prepare our payload
        payload = {
            "entity_id": self.entity_id,
            "message_type": message_type,
            "entity_display_name": title if title else self.app_desc,
            "state_message": body,
            "monitoring_tool": self.app_id,
        }

        notify_url = self.notify_url.format(
            apikey=self.apikey,
            routing_key=self.routing_key)

        self.logger.debug('Splunk GET URL: %s (cert_verify=%r)' % (
            notify_url, self.verify_certificate))
        self.logger.debug('Splunk Payload: %s' % str(payload))

        # Always call throttle before any remote server i/o is made
        self.throttle()

        try:
            r = requests.post(
                notify_url,
                data=dumps(payload).encode('utf-8'),
                headers=headers,
                verify=self.verify_certificate,
                timeout=self.request_timeout,
            )
            # Sample Response
            # {
            #   "result" : "success",
            #   "entity_id" : "disk space/db01.mycompany.com"
            # }

            if r.status_code != requests.codes.ok:
                # We had a problem
                status_str = \
                    NotifySplunk.http_response_code_lookup(r.status_code)

                self.logger.warning(
                    'Failed to send Splunk notification: '
                    '{}{}error={}.'.format(
                        status_str,
                        ', ' if status_str else '',
                        r.status_code))

                self.logger.debug('Response Details:\r\n{}'.format(r.content))

                # Return; we're done
                return False

            else:
                self.logger.info('Sent Splunk notification.')

        except requests.RequestException as e:
            self.logger.warning(
                'A Connection error occurred sending Splunk '
                'notification.')
            self.logger.debug('Socket Exception: %s' % str(e))

            # Return; we're done
            return False

        return True

    def url(self, privacy=False, *args, **kwargs):
        """
        Returns the URL built dynamically based on specified arguments.
        """

        # Define any URL parameters
        params = {
            'action': self.action,
        }

        # Extend our parameters
        params.update(self.url_parameters(privacy=privacy, *args, **kwargs))

        # Append our assignment extra's into our parameters
        params.update(
            {':{}'.format(k): v for k, v in self.mapping.items()})

        return '{schema}://{routing_key}@{apikey}/{entity_id}?{params}'.format(
            schema=self.secure_protocol[0],
            routing_key=self.routing_key,
            entity_id='' if self.entity_id == self.routing_key
            else self.entity_id,
            apikey=self.pprint(self.apikey, privacy, safe=''),
            params=NotifySplunk.urlencode(params),
        )

    @staticmethod
    def parse_url(url):
        """
        Parses the URL and returns enough arguments that can allow
        us to re-instantiate this object.

        """

        # parse_url already handles getting the `user` and `password` fields
        # populated.
        results = NotifyBase.parse_url(url, verify_host=False)
        if not results:
            # We're done early as we couldn't load the results
            return results

        # Entity ID
        if 'entity_id' in results['qsd'] and len(results['qsd']['entity_id']):
            results['entity_id'] = \
                NotifySplunk.unquote(results['qsd']['entity_id'])
        else:
            results['entity_id'] = NotifySplunk.unquote(results['fullpath'])

        # API Key
        if 'apikey' in results['qsd'] and len(results['qsd']['apikey']):
            results['apikey'] = NotifySplunk.unquote(results['qsd']['apikey'])

        else:
            results['apikey'] = NotifySplunk.unquote(results['host'])

        # Routing Key
        if 'routing_key' in results['qsd'] \
                and len(results['qsd']['routing_key']):
            results['routing_key'] = \
                NotifySplunk.unquote(results['qsd']['routing_key'])

        elif 'route' in results['qsd'] and len(results['qsd']['route']):
            results['routing_key'] = \
                NotifySplunk.unquote(results['qsd']['route'])

        else:
            results['routing_key'] = NotifySplunk.unquote(results['user'])

        # Store our action (if defined)
        if 'action' in results['qsd'] and len(results['qsd']['action']):
            results['action'] = NotifySplunk.unquote(results['qsd']['action'])

        # store any custom mapping defined
        results['mapping'] = {NotifySplunk.unquote(x): NotifySplunk.unquote(y)
                              for x, y in results['qsd:'].items()}

        return results

    @staticmethod
    def parse_native_url(url):
        """
        Support https://alert.victorops.com/integrations/generic/20131114/ \
                     alert/apikey/routing_key
        """

        result = re.match(
            r'^https?://alert\.victorops\.com/integrations/generic/'
            r'(?P<version>[0-9]+)/alert/(?P<apikey>[0-9a-z_-]+)'
            r'(/(?P<routing_key>[^?/]+))'
            r'(/(?P<entity_id>[^?]+))?/*'
            r'(?P<params>\?.+)?$', url, re.I)

        if result:
            return NotifySplunk.parse_url(
                '{schema}://{routing_key}@{apikey}/{entity_id}{params}'.format(
                    schema=NotifySplunk.secure_protocol[0],
                    apikey=result.group('apikey'),
                    routing_key=result.group('routing_key'),
                    entity_id='' if not result.group('entity_id')
                    else result.group('entity_id'),
                    params='' if not result.group('params')
                    else result.group('params')))

        return None