# -*- coding: utf-8 -*-
#
# Copyright (C) 2020 Chris Caron <lead2gold@gmail.com>
# All rights reserved.
#
# This code is licensed under the MIT License.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files(the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions :
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

# Signup @ https://www.opsgenie.com
#
# Generate your Integration API Key
#   https://app.opsgenie.com/settings/integration/add/API/

# Knowing this, you can build your Opsgenie URL as follows:
#  opsgenie://{apikey}/
#  opsgenie://{apikey}/@{user}
#  opsgenie://{apikey}/*{schedule}
#  opsgenie://{apikey}/^{escalation}
#  opsgenie://{apikey}/#{team}
#
# You can mix and match what you want to notify freely
#  opsgenie://{apikey}/@{user}/#{team}/*{schedule}/^{escalation}
#
# If no target prefix is specified, then it is assumed to be a user.
#
# API Documentation: https://docs.opsgenie.com/docs/alert-api
# API Integration Docs: https://docs.opsgenie.com/docs/api-integration

import requests
from json import dumps

from .NotifyBase import NotifyBase
from ..common import NotifyType
from ..utils import validate_regex
from ..utils import is_uuid
from ..utils import parse_list
from ..utils import parse_bool
from ..AppriseLocale import gettext_lazy as _


class OpsgenieCategory(NotifyBase):
    """
    We define the different category types that we can notify
    """
    USER = 'user'
    SCHEDULE = 'schedule'
    ESCALATION = 'escalation'
    TEAM = 'team'


OPSGENIE_CATEGORIES = (
    OpsgenieCategory.USER,
    OpsgenieCategory.SCHEDULE,
    OpsgenieCategory.ESCALATION,
    OpsgenieCategory.TEAM,
)


# Regions
class OpsgenieRegion:
    US = 'us'
    EU = 'eu'


# Opsgenie APIs
OPSGENIE_API_LOOKUP = {
    OpsgenieRegion.US: 'https://api.opsgenie.com/v2/alerts',
    OpsgenieRegion.EU: 'https://api.eu.opsgenie.com/v2/alerts',
}

# A List of our regions we can use for verification
OPSGENIE_REGIONS = (
    OpsgenieRegion.US,
    OpsgenieRegion.EU,
)


# Priorities
class OpsgeniePriority:
    LOW = 1
    MODERATE = 2
    NORMAL = 3
    HIGH = 4
    EMERGENCY = 5


OPSGENIE_PRIORITIES = {
    # Note: This also acts as a reverse lookup mapping
    OpsgeniePriority.LOW: 'low',
    OpsgeniePriority.MODERATE: 'moderate',
    OpsgeniePriority.NORMAL: 'normal',
    OpsgeniePriority.HIGH: 'high',
    OpsgeniePriority.EMERGENCY: 'emergency',
}

OPSGENIE_PRIORITY_MAP = {
    # Maps against string 'low'
    'l': OpsgeniePriority.LOW,
    # Maps against string 'moderate'
    'm': OpsgeniePriority.MODERATE,
    # Maps against string 'normal'
    'n': OpsgeniePriority.NORMAL,
    # Maps against string 'high'
    'h': OpsgeniePriority.HIGH,
    # Maps against string 'emergency'
    'e': OpsgeniePriority.EMERGENCY,

    # Entries to additionally support (so more like Opsgenie's API)
    '1': OpsgeniePriority.LOW,
    '2': OpsgeniePriority.MODERATE,
    '3': OpsgeniePriority.NORMAL,
    '4': OpsgeniePriority.HIGH,
    '5': OpsgeniePriority.EMERGENCY,
    # Support p-prefix
    'p1': OpsgeniePriority.LOW,
    'p2': OpsgeniePriority.MODERATE,
    'p3': OpsgeniePriority.NORMAL,
    'p4': OpsgeniePriority.HIGH,
    'p5': OpsgeniePriority.EMERGENCY,
}


class NotifyOpsgenie(NotifyBase):
    """
    A wrapper for Opsgenie Notifications
    """

    # The default descriptive name associated with the Notification
    service_name = 'Opsgenie'

    # The services URL
    service_url = 'https://opsgenie.com/'

    # All notification requests are secure
    secure_protocol = 'opsgenie'

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

    # The maximum length of the body
    body_maxlen = 15000

    # If we don't have the specified min length, then we don't bother using
    # the body directive
    opsgenie_body_minlen = 130

    # The default region to use if one isn't otherwise specified
    opsgenie_default_region = OpsgenieRegion.US

    # The maximum allowable targets within a notification
    maximum_batch_size = 50

    # Define object templates
    templates = (
        '{schema}://{apikey}',
        '{schema}://{apikey}/{targets}',
    )

    # Define our template tokens
    template_tokens = dict(NotifyBase.template_tokens, **{
        'apikey': {
            'name': _('API Key'),
            'type': 'string',
            'private': True,
            'required': True,
        },
        'target_escalation': {
            'name': _('Target Escalation'),
            'prefix': '^',
            'type': 'string',
            'map_to': 'targets',
        },
        'target_schedule': {
            'name': _('Target Schedule'),
            'type': 'string',
            'prefix': '*',
            'map_to': 'targets',
        },
        'target_user': {
            'name': _('Target User'),
            'type': 'string',
            'prefix': '@',
            'map_to': 'targets',
        },
        'target_team': {
            'name': _('Target Team'),
            'type': 'string',
            'prefix': '#',
            'map_to': 'targets',
        },
        'targets': {
            'name': _('Targets '),
            'type': 'list:string',
        },
    })

    # Define our template arguments
    template_args = dict(NotifyBase.template_args, **{
        'region': {
            'name': _('Region Name'),
            'type': 'choice:string',
            'values': OPSGENIE_REGIONS,
            'default': OpsgenieRegion.US,
            'map_to': 'region_name',
        },
        'batch': {
            'name': _('Batch Mode'),
            'type': 'bool',
            'default': False,
        },
        'priority': {
            'name': _('Priority'),
            'type': 'choice:int',
            'values': OPSGENIE_PRIORITIES,
            'default': OpsgeniePriority.NORMAL,
        },
        'entity': {
            'name': _('Entity'),
            'type': 'string',
        },
        'alias': {
            'name': _('Alias'),
            'type': 'string',
        },
        'tags': {
            'name': _('Tags'),
            'type': 'string',
        },
        'to': {
            'alias_of': 'targets',
        },
    })

    # Map of key-value pairs to use as custom properties of the alert.
    template_kwargs = {
        'details': {
            'name': _('Details'),
            'prefix': '+',
        },
    }

    def __init__(self, apikey, targets, region_name=None, details=None,
                 priority=None, alias=None, entity=None, batch=False,
                 tags=None, **kwargs):
        """
        Initialize Opsgenie Object
        """
        super(NotifyOpsgenie, self).__init__(**kwargs)

        # API Key (associated with project)
        self.apikey = validate_regex(apikey)
        if not self.apikey:
            msg = 'An invalid Opsgenie API Key ' \
                  '({}) was specified.'.format(apikey)
            self.logger.warning(msg)
            raise TypeError(msg)

        # The Priority of the message
        self.priority = NotifyOpsgenie.template_args['priority']['default'] \
            if not priority else \
            next((
                v for k, v in OPSGENIE_PRIORITY_MAP.items()
                if str(priority).lower().startswith(k)),
                NotifyOpsgenie.template_args['priority']['default'])

        # Store our region
        try:
            self.region_name = self.opsgenie_default_region \
                if region_name is None else region_name.lower()

            if self.region_name not in OPSGENIE_REGIONS:
                # allow the outer except to handle this common response
                raise
        except:
            # Invalid region specified
            msg = 'The Opsgenie region specified ({}) is invalid.' \
                  .format(region_name)
            self.logger.warning(msg)
            raise TypeError(msg)

        self.details = {}
        if details:
            # Store our extra details
            self.details.update(details)

        # Prepare Batch Mode Flag
        self.batch_size = self.maximum_batch_size if batch else 1

        # Assign our tags (if defined)
        self.__tags = parse_list(tags)

        # Assign our entity (if defined)
        self.entity = entity

        # Assign our alias (if defined)
        self.alias = alias

        # Initialize our Targets
        self.targets = []

        # Sort our targets
        for _target in parse_list(targets):
            target = _target.strip()
            if len(target) < 2:
                self.logger.debug('Ignoring Opsgenie Entry: %s' % target)
                continue

            if target.startswith(NotifyOpsgenie.template_tokens
                                 ['target_team']['prefix']):

                self.targets.append(
                    {'type': OpsgenieCategory.TEAM, 'id': target[1:]}
                    if is_uuid(target[1:]) else
                    {'type': OpsgenieCategory.TEAM, 'name': target[1:]})

            elif target.startswith(NotifyOpsgenie.template_tokens
                                   ['target_schedule']['prefix']):

                self.targets.append(
                    {'type': OpsgenieCategory.SCHEDULE, 'id': target[1:]}
                    if is_uuid(target[1:]) else
                    {'type': OpsgenieCategory.SCHEDULE, 'name': target[1:]})

            elif target.startswith(NotifyOpsgenie.template_tokens
                                   ['target_escalation']['prefix']):

                self.targets.append(
                    {'type': OpsgenieCategory.ESCALATION, 'id': target[1:]}
                    if is_uuid(target[1:]) else
                    {'type': OpsgenieCategory.ESCALATION, 'name': target[1:]})

            elif target.startswith(NotifyOpsgenie.template_tokens
                                   ['target_user']['prefix']):

                self.targets.append(
                    {'type': OpsgenieCategory.USER, 'id': target[1:]}
                    if is_uuid(target[1:]) else
                    {'type': OpsgenieCategory.USER, 'username': target[1:]})

            else:
                # Ambiguious entry; treat it as a user but not before
                # displaying a warning to the end user first:
                self.logger.debug(
                    'Treating ambigious Opsgenie target %s as a user', target)
                self.targets.append(
                    {'type': OpsgenieCategory.USER, 'id': target}
                    if is_uuid(target) else
                    {'type': OpsgenieCategory.USER, 'username': target})

    def send(self, body, title='', notify_type=NotifyType.INFO, **kwargs):
        """
        Perform Opsgenie Notification
        """

        headers = {
            'User-Agent': self.app_id,
            'Content-Type': 'application/json',
            'Authorization': 'GenieKey {}'.format(self.apikey),
        }

        # Prepare our URL as it's based on our hostname
        notify_url = OPSGENIE_API_LOOKUP[self.region_name]

        # Initialize our has_error flag
        has_error = False

        # Use body if title not set
        title_body = body if not title else body

        # Create a copy ouf our details object
        details = self.details.copy()
        if 'type' not in details:
            details['type'] = notify_type

        # Prepare our payload
        payload = {
            'source': self.app_desc,
            'message': title_body,
            'description': body,
            'details': details,
            'priority': 'P{}'.format(self.priority),
        }

        # Use our body directive if we exceed the minimum message
        # limitation
        if len(payload['message']) > self.opsgenie_body_minlen:
            payload['message'] = '{}...'.format(
                title_body[:self.opsgenie_body_minlen - 3])

        if self.__tags:
            payload['tags'] = self.__tags

        if self.entity:
            payload['entity'] = self.entity

        if self.alias:
            payload['alias'] = self.alias

        length = len(self.targets) if self.targets else 1
        for index in range(0, length, self.batch_size):
            if self.targets:
                # If there were no targets identified, then we simply
                # just iterate once without the responders set
                payload['responders'] = \
                    self.targets[index:index + self.batch_size]

            # Some Debug Logging
            self.logger.debug(
                'Opsgenie POST URL: {} (cert_verify={})'.format(
                    notify_url, self.verify_certificate))
            self.logger.debug('Opsgenie Payload: {}' .format(payload))

            # Always call throttle before any remote server i/o is made
            self.throttle()
            try:
                r = requests.post(
                    notify_url,
                    data=dumps(payload),
                    headers=headers,
                    verify=self.verify_certificate,
                    timeout=self.request_timeout,
                )

                if r.status_code not in (
                        requests.codes.accepted, requests.codes.ok):
                    status_str = \
                        NotifyBase.http_response_code_lookup(
                            r.status_code)

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

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

                    # Mark our failure
                    has_error = True
                    continue

                # If we reach here; the message was sent
                self.logger.info('Sent Opsgenie notification')
                self.logger.debug(
                    'Response Details:\r\n{}'.format(r.content))

            except requests.RequestException as e:
                self.logger.warning(
                    'A Connection error occurred sending Opsgenie '
                    'notification.')
                self.logger.debug('Socket Exception: %s' % str(e))
                # Mark our failure
                has_error = True

        return not has_error

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

        # Define any URL parameters
        params = {
            'region': self.region_name,
            'priority':
                OPSGENIE_PRIORITIES[self.template_args['priority']['default']]
                if self.priority not in OPSGENIE_PRIORITIES
                else OPSGENIE_PRIORITIES[self.priority],
            'batch': 'yes' if self.batch_size > 1 else 'no',
        }

        # Assign our entity value (if defined)
        if self.entity:
            params['entity'] = self.entity

        # Assign our alias value (if defined)
        if self.alias:
            params['alias'] = self.alias

        # Assign our tags (if specifed)
        if self.__tags:
            params['tags'] = ','.join(self.__tags)

        # Append our details into our parameters
        params.update({'+{}'.format(k): v for k, v in self.details.items()})

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

        # A map allows us to map our target types so they can be correctly
        # placed back into your URL below. Hence map the 'user' -> '@'
        __map = {
            OpsgenieCategory.USER:
                NotifyOpsgenie.template_tokens['target_user']['prefix'],
            OpsgenieCategory.SCHEDULE:
                NotifyOpsgenie.template_tokens['target_schedule']['prefix'],
            OpsgenieCategory.ESCALATION:
                NotifyOpsgenie.template_tokens['target_escalation']['prefix'],
            OpsgenieCategory.TEAM:
                NotifyOpsgenie.template_tokens['target_team']['prefix'],
        }

        return '{schema}://{apikey}/{targets}/?{params}'.format(
            schema=self.secure_protocol,
            apikey=self.pprint(self.apikey, privacy, safe=''),
            targets='/'.join(
                [NotifyOpsgenie.quote('{}{}'.format(
                    __map[x['type']],
                    x.get('id', x.get('name', x.get('username')))))
                    for x in self.targets]),
            params=NotifyOpsgenie.urlencode(params))

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

        """
        results = NotifyBase.parse_url(url, verify_host=False)
        if not results:
            # We're done early as we couldn't load the results
            return results

        # The API Key is stored in the hostname
        results['apikey'] = NotifyOpsgenie.unquote(results['host'])

        # Get our Targets
        results['targets'] = NotifyOpsgenie.split_path(results['fullpath'])

        # Add our Meta Detail keys
        results['details'] = {NotifyBase.unquote(x): NotifyBase.unquote(y)
                              for x, y in results['qsd+'].items()}

        # Set our priority
        if 'priority' in results['qsd'] and len(results['qsd']['priority']):
            results['priority'] = \
                NotifyOpsgenie.unquote(results['qsd']['priority'])

        # Get Batch Boolean (if set)
        results['batch'] = \
            parse_bool(
                results['qsd'].get(
                    'batch',
                    NotifyOpsgenie.template_args['batch']['default']))

        if 'apikey' in results['qsd'] and len(results['qsd']['apikey']):
            results['apikey'] = \
                NotifyOpsgenie.unquote(results['qsd']['apikey'])

        if 'tags' in results['qsd'] and len(results['qsd']['tags']):
            # Extract our tags
            results['tags'] = \
                parse_list(NotifyOpsgenie.unquote(results['qsd']['tags']))

        if 'region' in results['qsd'] and len(results['qsd']['region']):
            # Extract our region
            results['region_name'] = \
                NotifyOpsgenie.unquote(results['qsd']['region'])

        if 'entity' in results['qsd'] and len(results['qsd']['entity']):
            # Extract optional entity field
            results['entity'] = \
                NotifyOpsgenie.unquote(results['qsd']['entity'])

        if 'alias' in results['qsd'] and len(results['qsd']['alias']):
            # Extract optional alias field
            results['alias'] = \
                NotifyOpsgenie.unquote(results['qsd']['alias'])

        # Handle 'to' email address
        if 'to' in results['qsd'] and len(results['qsd']['to']):
            results['targets'].append(results['qsd']['to'])

        return results