# -*- coding: utf-8 -*-
#
# Copyright (C) 2022 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.

# Great sources
# - https://github.com/matrix-org/matrix-python-sdk
# - https://github.com/matrix-org/synapse/blob/master/docs/reverse_proxy.rst
#
# Examples:
#   ntfys://my-topic
#   ntfy://ntfy.local.domain/my-topic
#   ntfys://ntfy.local.domain:8080/my-topic
#   ntfy://ntfy.local.domain/?priority=max
import re
import requests
import six
from json import loads
from json import dumps
from os.path import basename

from .NotifyBase import NotifyBase
from ..common import NotifyType
from ..AppriseLocale import gettext_lazy as _
from ..utils import parse_list
from ..utils import is_hostname
from ..utils import is_ipaddr
from ..utils import validate_regex
from ..URLBase import PrivacyMode
from ..attachment.AttachBase import AttachBase


class NtfyMode(object):
    """
    Define ntfy Notification Modes
    """
    # App posts upstream to the developer API on ntfy's website
    CLOUD = "cloud"

    # Running a dedicated private ntfy Server
    PRIVATE = "private"


NTFY_MODES = (
    NtfyMode.CLOUD,
    NtfyMode.PRIVATE,
)


class NtfyPriority(object):
    """
    Ntfy Priority Definitions
    """
    MAX = 'max'
    HIGH = 'high'
    NORMAL = 'default'
    LOW = 'low'
    MIN = 'min'


NTFY_PRIORITIES = (
    NtfyPriority.MAX,
    NtfyPriority.HIGH,
    NtfyPriority.NORMAL,
    NtfyPriority.LOW,
    NtfyPriority.MIN,
)


class NotifyNtfy(NotifyBase):
    """
    A wrapper for ntfy Notifications
    """

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

    # The services URL
    service_url = 'https://ntfy.sh/'

    # Insecure protocol (for those self hosted requests)
    protocol = 'ntfy'

    # The default protocol
    secure_protocol = 'ntfys'

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

    # Default upstream/cloud host if none is defined
    cloud_notify_url = 'https://ntfy.sh'

    # Message time to live (if remote client isn't around to receive it)
    time_to_live = 2419200

    # if our hostname matches the following we automatically enforce
    # cloud mode
    __auto_cloud_host = re.compile(r'ntfy\.sh', re.IGNORECASE)

    # Define object templates
    templates = (
        '{schema}://{topic}',
        '{schema}://{host}/{targets}',
        '{schema}://{host}:{port}/{targets}',
        '{schema}://{user}@{host}/{targets}',
        '{schema}://{user}@{host}:{port}/{targets}',
        '{schema}://{user}:{password}@{host}/{targets}',
        '{schema}://{user}:{password}@{host}:{port}/{targets}',
    )

    # Define our template tokens
    template_tokens = dict(NotifyBase.template_tokens, **{
        'host': {
            'name': _('Hostname'),
            'type': 'string',
        },
        'port': {
            'name': _('Port'),
            'type': 'int',
            'min': 1,
            'max': 65535,
        },
        'user': {
            'name': _('Username'),
            'type': 'string',
        },
        'password': {
            'name': _('Password'),
            'type': 'string',
            'private': True,
        },
        'topic': {
            'name': _('Topic'),
            'type': 'string',
            'map_to': 'targets',
            'regex': (r'^[a-z0-9_-]{1,64}$', 'i')
        },
        'targets': {
            'name': _('Targets'),
            'type': 'list:string',
        },
    })

    # Define our template arguments
    template_args = dict(NotifyBase.template_args, **{
        'attach': {
            'name': _('Attach'),
            'type': 'string',
        },
        'filename': {
            'name': _('Attach Filename'),
            'type': 'string',
        },
        'click': {
            'name': _('Click'),
            'type': 'string',
        },
        'delay': {
            'name': _('Delay'),
            'type': 'string',
        },
        'email': {
            'name': _('Email'),
            'type': 'string',
        },
        'priority': {
            'name': _('Priority'),
            'type': 'choice:string',
            'values': NTFY_PRIORITIES,
            'default': NtfyPriority.NORMAL,
        },
        'tags': {
            'name': _('Tags'),
            'type': 'string',
        },
        'mode': {
            'name': _('Mode'),
            'type': 'choice:string',
            'values': NTFY_MODES,
            'default': NtfyMode.PRIVATE,
        },
        'to': {
            'alias_of': 'targets',
        },
    })

    def __init__(self, targets=None, attach=None, filename=None, click=None,
                 delay=None, email=None, priority=None, tags=None, mode=None,
                 **kwargs):
        """
        Initialize ntfy Object
        """
        super(NotifyNtfy, self).__init__(**kwargs)

        # Prepare our mode
        self.mode = mode.strip().lower() \
            if isinstance(mode, six.string_types) \
            else self.template_args['mode']['default']

        if self.mode not in NTFY_MODES:
            msg = 'An invalid ntfy Mode ({}) was specified.'.format(mode)
            self.logger.warning(msg)
            raise TypeError(msg)

        # Attach a file (URL supported)
        self.attach = attach

        # Our filename (if defined)
        self.filename = filename

        # A clickthrough option for notifications
        self.click = click

        # Time delay for notifications (various string formats)
        self.delay = delay

        # An email to forward notifications to
        self.email = email

        # The priority of the message

        if priority is None:
            self.priority = self.template_args['priority']['default']
        else:
            self.priority = priority

        if self.priority not in NTFY_PRIORITIES:
            msg = 'An invalid ntfy Priority ({}) was specified.'.format(
                priority)
            self.logger.warning(msg)
            raise TypeError(msg)

        # Any optional tags to attach to the notification
        self.__tags = parse_list(tags)

        # Build list of topics
        topics = parse_list(targets)
        self.topics = []
        for _topic in topics:
            topic = validate_regex(
                _topic, *self.template_tokens['topic']['regex'])
            if not topic:
                self.logger.warning(
                    'A specified ntfy topic ({}) is invalid and will be '
                    'ignored'.format(_topic))
                continue
            self.topics.append(topic)
        return

    def send(self, body, title='', notify_type=NotifyType.INFO, attach=None,
             **kwargs):
        """
        Perform ntfy Notification
        """

        # error tracking (used for function return)
        has_error = False

        if not len(self.topics):
            # We have nothing to notify; we're done
            self.logger.warning('There are no ntfy topics to notify')
            return False

        # Create a copy of the topics
        topics = list(self.topics)
        while len(topics) > 0:
            # Retrieve our topic
            topic = topics.pop()

            if attach:
                # We need to upload our payload first so that we can source it
                # in remaining messages
                for no, attachment in enumerate(attach):

                    # First message only includes the text
                    _body = body if not no else None
                    _title = title if not no else None

                    # Perform some simple error checking
                    if not attachment:
                        # We could not access the attachment
                        self.logger.error(
                            'Could not access attachment {}.'.format(
                                attachment.url(privacy=True)))
                        return False

                    self.logger.debug(
                        'Preparing ntfy attachment {}'.format(
                            attachment.url(privacy=True)))

                    okay, response = self._send(
                        topic, body=_body, title=_title, attach=attachment)
                    if not okay:
                        # We can't post our attachment; abort immediately
                        return False
            else:
                # Send our Notification Message
                okay, response = self._send(topic, body=body, title=title)
                if not okay:
                    # Mark our failure, but contiue to move on
                    has_error = True

        return not has_error

    def _send(self, topic, body=None, title=None, attach=None, **kwargs):
        """
        Wrapper to the requests (post) object
        """

        # Prepare our headers
        headers = {
            'User-Agent': self.app_id,
        }

        # Some default values for our request object to which we'll update
        # depending on what our payload is
        files = None

        # See https://ntfy.sh/docs/publish/#publish-as-json
        data = {}

        # Posting Parameters
        params = {}

        auth = None
        if self.mode == NtfyMode.CLOUD:
            # Cloud Service
            notify_url = self.cloud_notify_url

        else:  # NotifyNtfy.PRVATE
            # Allow more settings to be applied now
            if self.user:
                auth = (self.user, self.password)

            # Prepare our ntfy Template URL
            schema = 'https' if self.secure else 'http'

            notify_url = '%s://%s' % (schema, self.host)
            if isinstance(self.port, int):
                notify_url += ':%d' % self.port

        if not attach:
            headers['Content-Type'] = 'application/json'

            data['topic'] = topic
            virt_payload = data

        else:
            # Point our payload to our parameters
            virt_payload = params
            notify_url += '/{topic}'.format(topic=topic)

        if title:
            virt_payload['title'] = title

        if body:
            virt_payload['message'] = body

        if self.priority != NtfyPriority.NORMAL:
            headers['X-Priority'] = self.priority

        if self.delay is not None:
            headers['X-Delay'] = self.delay

        if self.click is not None:
            headers['X-Click'] = self.click

        if self.email is not None:
            headers['X-Email'] = self.email

        if self.__tags:
            headers['X-Tags'] = ",".join(self.__tags)

        if isinstance(attach, AttachBase):
            # Prepare our Header
            params['filename'] = attach.name

            # prepare our files object
            files = {'file': (attach.name, open(attach.path, 'rb'))}

        elif self.attach is not None:
            data['attach'] = self.attach
            if self.filename is not None:
                data['filename'] = self.filename

        self.logger.debug('ntfy POST URL: %s (cert_verify=%r)' % (
            notify_url, self.verify_certificate,
        ))
        self.logger.debug('ntfy Payload: %s' % str(virt_payload))
        self.logger.debug('ntfy Headers: %s' % str(headers))

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

        # Default response type
        response = None

        try:
            r = requests.post(
                notify_url,
                params=params if params else None,
                data=dumps(data) if data else None,
                headers=headers,
                files=files,
                auth=auth,
                verify=self.verify_certificate,
                timeout=self.request_timeout,
            )

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

                # set up our status code to use
                status_code = r.status_code

                try:
                    # Update our status response if we can
                    response = loads(r.content)
                    status_str = response.get('error', status_str)
                    status_code = \
                        int(response.get('code', status_code))

                except (AttributeError, TypeError, ValueError):
                    # ValueError = r.content is Unparsable
                    # TypeError = r.content is None
                    # AttributeError = r is None

                    # We could not parse JSON response.
                    # We will just use the status we already have.
                    pass

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

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

                return False, response

            # otherwise we were successful
            self.logger.info(
                "Sent ntfy notification to '{}'.".format(notify_url))

            return True, response

        except requests.RequestException as e:
            self.logger.warning(
                'A Connection error occurred sending ntfy:%s ' % (
                    notify_url) + 'notification.'
            )
            self.logger.debug('Socket Exception: %s' % str(e))
            return False, response

        except (OSError, IOError) as e:
            self.logger.warning(
                'An I/O error occurred while handling {}.'.format(
                    attach.name if isinstance(attach, AttachBase)
                    else virt_payload))
            self.logger.debug('I/O Exception: %s' % str(e))
            return False, response

        finally:
            # Close our file (if it's open) stored in the second element
            # of our files tuple (index 1)
            if files:
                files['file'][1].close()

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

        default_port = 443 if self.secure else 80

        params = {
            'priority': self.priority,
            'mode': self.mode,
        }

        if self.attach is not None:
            params['attach'] = self.attach

        if self.click is not None:
            params['click'] = self.click

        if self.delay is not None:
            params['delay'] = self.delay

        if self.email is not None:
            params['email'] = self.email

        if self.__tags:
            params['tags'] = ','.join(self.__tags)

        params.update(self.url_parameters(privacy=privacy, *args, **kwargs))

        # Determine Authentication
        auth = ''
        if self.user and self.password:
            auth = '{user}:{password}@'.format(
                user=NotifyNtfy.quote(self.user, safe=''),
                password=self.pprint(
                    self.password, privacy, mode=PrivacyMode.Secret, safe=''),
            )
        elif self.user:
            auth = '{user}@'.format(
                user=NotifyNtfy.quote(self.user, safe=''),
            )

        if self.mode == NtfyMode.PRIVATE:
            return '{schema}://{auth}{host}{port}/{targets}?{params}'.format(
                schema=self.secure_protocol if self.secure else self.protocol,
                auth=auth,
                host=self.host,
                port='' if self.port is None or self.port == default_port
                else ':{}'.format(self.port),
                targets='/'.join(
                    [NotifyNtfy.quote(x, safe='') for x in self.topics]),
                params=NotifyNtfy.urlencode(params)
            )

        else:  # Cloud mode
            return '{schema}://{targets}?{params}'.format(
                schema=self.secure_protocol,
                targets='/'.join(
                    [NotifyNtfy.quote(x, safe='') for x in self.topics]),
                params=NotifyNtfy.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

        if 'priority' in results['qsd'] and len(results['qsd']['priority']):
            _map = {
                # Supported lookups
                'mi': NtfyPriority.MIN,
                '1': NtfyPriority.MIN,
                'l': NtfyPriority.LOW,
                '2': NtfyPriority.LOW,
                'n': NtfyPriority.NORMAL,  # support normal keyword
                'd': NtfyPriority.NORMAL,  # default keyword
                '3': NtfyPriority.NORMAL,
                'h': NtfyPriority.HIGH,
                '4': NtfyPriority.HIGH,
                'ma': NtfyPriority.MAX,
                '5': NtfyPriority.MAX,
            }
            try:
                # pretty-format (and update short-format)
                results['priority'] = \
                    _map[results['qsd']['priority'][0:2].lower()]

            except KeyError:
                # Pass along what was set so it can be handed during
                # initialization
                results['priority'] = str(results['qsd']['priority'])
                pass

        if 'attach' in results['qsd'] and len(results['qsd']['attach']):
            results['attach'] = NotifyNtfy.unquote(results['qsd']['attach'])
            _results = NotifyBase.parse_url(results['attach'])
            if _results:
                results['filename'] = \
                    None if _results['fullpath'] \
                    else basename(_results['fullpath'])

            if 'filename' in results['qsd'] and \
                    len(results['qsd']['filename']):
                results['filename'] = \
                    basename(NotifyNtfy.unquote(results['qsd']['filename']))

        if 'click' in results['qsd'] and len(results['qsd']['click']):
            results['click'] = NotifyNtfy.unquote(results['qsd']['click'])

        if 'delay' in results['qsd'] and len(results['qsd']['delay']):
            results['delay'] = NotifyNtfy.unquote(results['qsd']['delay'])

        if 'email' in results['qsd'] and len(results['qsd']['email']):
            results['email'] = NotifyNtfy.unquote(results['qsd']['email'])

        if 'tags' in results['qsd'] and len(results['qsd']['tags']):
            results['tags'] = \
                parse_list(NotifyNtfy.unquote(results['qsd']['tags']))

        # Acquire our targets/topics
        results['targets'] = NotifyNtfy.split_path(results['fullpath'])

        # The 'to' makes it easier to use yaml configuration
        if 'to' in results['qsd'] and len(results['qsd']['to']):
            results['targets'] += \
                NotifyNtfy.parse_list(results['qsd']['to'])

        # Mode override
        if 'mode' in results['qsd'] and results['qsd']['mode']:
            results['mode'] = NotifyNtfy.unquote(
                results['qsd']['mode'].strip().lower())

        else:
            # We can try to detect the mode based on the validity of the
            # hostname.
            #
            # This isn't a surfire way to do things though; it's best to
            # specify the mode= flag
            results['mode'] = NtfyMode.PRIVATE \
                if ((is_hostname(results['host'])
                    or is_ipaddr(results['host'])) and results['targets']) \
                else NtfyMode.CLOUD

        if results['mode'] == NtfyMode.CLOUD:
            # Store first entry as it can be a topic too in this case
            # But only if we also rule it out not being the words
            # ntfy.sh itself, something that starts wiht an non-alpha numeric
            # character:
            if not NotifyNtfy.__auto_cloud_host.search(results['host']):
                # Add it to the front of the list for consistency
                results['targets'].insert(0, results['host'])

        elif results['mode'] == NtfyMode.PRIVATE and \
                not (is_hostname(results['host'] or
                     is_ipaddr(results['host']))):
            # Invalid Host for NtfyMode.PRIVATE
            return None

        return results

    @staticmethod
    def parse_native_url(url):
        """
        Support https://ntfy.sh/topic
        """

        # Quick lookup for users who want to just paste
        # the ntfy.sh url directly into Apprise
        result = re.match(
            r'^(http|ntfy)s?://ntfy\.sh'
            r'(?P<topics>/[^?]+)?'
            r'(?P<params>\?.+)?$', url, re.I)

        if result:
            mode = 'mode=%s' % NtfyMode.CLOUD
            return NotifyNtfy.parse_url(
                '{schema}://{topics}{params}'.format(
                    schema=NotifyNtfy.secure_protocol,
                    topics=result.group('topics')
                    if result.group('topics') else '',
                    params='?%s' % mode
                    if not result.group('params')
                    else result.group('params') + '&%s' % mode))

        return None
