# -*- coding: utf-8 -*-
# BSD 3-Clause License
#
# Apprise - Push Notification Library.
# Copyright (c) 2023, 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.
#
# 3. Neither the name of the copyright holder nor the names of its
#    contributors may be used to endorse or promote products derived from
#    this software without specific prior written permission.
#
# 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.

import re
import requests

from .NotifyBase import NotifyBase
from ..URLBase import PrivacyMode
from ..common import NotifyImageSize
from ..common import NotifyType
from ..AppriseLocale import gettext_lazy as _


class FORMPayloadField:
    """
    Identifies the fields available in the FORM Payload
    """
    VERSION = 'version'
    TITLE = 'title'
    MESSAGE = 'message'
    MESSAGETYPE = 'type'


# Defines the method to send the notification
METHODS = (
    'POST',
    'GET',
    'DELETE',
    'PUT',
    'HEAD',
    'PATCH'
)


class NotifyForm(NotifyBase):
    """
    A wrapper for Form Notifications
    """

    # Support
    # - file*
    # - file?
    # - file*name
    # - file?name
    # - ?file
    # - *file
    # - file
    # The code will convert the ? or * to the digit increments
    __attach_as_re = re.compile(
        r'((?P<match1>(?P<id1a>[a-z0-9_-]+)?'
        r'(?P<wc1>[*?+$:.%]+)(?P<id1b>[a-z0-9_-]+))'
        r'|(?P<match2>(?P<id2>[a-z0-9_-]+)(?P<wc2>[*?+$:.%]?)))',
        re.IGNORECASE)

    # Our count
    attach_as_count = '{:02d}'

    # the default attach_as value
    attach_as_default = f'file{attach_as_count}'

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

    # The default protocol
    protocol = 'form'

    # The default secure protocol
    secure_protocol = 'forms'

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

    # Allows the user to specify the NotifyImageSize object
    image_size = NotifyImageSize.XY_128

    # Disable throttle rate for Form requests since they are normally
    # local anyway
    request_rate_per_sec = 0

    # Define the FORM version to place in all payloads
    # Version: Major.Minor,  Major is only updated if the entire schema is
    # changed. If just adding new items (or removing old ones, only increment
    # the Minor!
    form_version = '1.0'

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

    # 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, **{
        'host': {
            'name': _('Hostname'),
            'type': 'string',
            'required': True,
        },
        'port': {
            'name': _('Port'),
            'type': 'int',
            'min': 1,
            'max': 65535,
        },
        'user': {
            'name': _('Username'),
            'type': 'string',
        },
        'password': {
            'name': _('Password'),
            'type': 'string',
            'private': True,
        },

    })

    # Define our template arguments
    template_args = dict(NotifyBase.template_args, **{
        'method': {
            'name': _('Fetch Method'),
            'type': 'choice:string',
            'values': METHODS,
            'default': METHODS[0],
        },
        'attach-as': {
            'name': _('Attach File As'),
            'type': 'string',
            'default': 'file*',
            'map_to': 'attach_as',
        },
    })

    # Define any kwargs we're using
    template_kwargs = {
        'headers': {
            'name': _('HTTP Header'),
            'prefix': '+',
        },
        'payload': {
            'name': _('Payload Extras'),
            'prefix': ':',
        },
        'params': {
            'name': _('GET Params'),
            'prefix': '-',
        },
    }

    def __init__(self, headers=None, method=None, payload=None, params=None,
                 attach_as=None, **kwargs):
        """
        Initialize Form Object

        headers can be a dictionary of key/value pairs that you want to
        additionally include as part of the server headers to post with

        """
        super().__init__(**kwargs)

        self.fullpath = kwargs.get('fullpath')
        if not isinstance(self.fullpath, str):
            self.fullpath = ''

        self.method = self.template_args['method']['default'] \
            if not isinstance(method, str) else method.upper()

        if self.method not in METHODS:
            msg = 'The method specified ({}) is invalid.'.format(method)
            self.logger.warning(msg)
            raise TypeError(msg)

        # Custom File Attachment Over-Ride Support
        if not isinstance(attach_as, str):
            # Default value
            self.attach_as = self.attach_as_default
            self.attach_multi_support = True

        else:
            result = self.__attach_as_re.match(attach_as.strip())
            if not result:
                msg = 'The attach-as specified ({}) is invalid.'.format(
                    attach_as)
                self.logger.warning(msg)
                raise TypeError(msg)

            self.attach_as = ''
            self.attach_multi_support = False
            if result.group('match1'):
                if result.group('id1a'):
                    self.attach_as += result.group('id1a')

                self.attach_as += self.attach_as_count
                self.attach_multi_support = True
                self.attach_as += result.group('id1b')

            else:  # result.group('match2'):
                self.attach_as += result.group('id2')
                if result.group('wc2'):
                    self.attach_as += self.attach_as_count
                    self.attach_multi_support = True

        # A payload map allows users to over-ride the default mapping if
        # they're detected with the :overide=value.  Normally this would
        # create a new key and assign it the value specified.  However
        # if the key you specify is actually an internally mapped one,
        # then a re-mapping takes place using the value
        self.payload_map = {
            FORMPayloadField.VERSION: FORMPayloadField.VERSION,
            FORMPayloadField.TITLE: FORMPayloadField.TITLE,
            FORMPayloadField.MESSAGE: FORMPayloadField.MESSAGE,
            FORMPayloadField.MESSAGETYPE: FORMPayloadField.MESSAGETYPE,
        }

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

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

        self.payload_overrides = {}
        self.payload_extras = {}
        if payload:
            # Store our extra payload entries
            self.payload_extras.update(payload)
            for key in list(self.payload_extras.keys()):
                # Any values set in the payload to alter a system related one
                # alters the system key.  Hence :message=msg maps the 'message'
                # variable that otherwise already contains the payload to be
                # 'msg' instead (containing the payload)
                if key in self.payload_map:
                    self.payload_map[key] = self.payload_extras[key]
                    self.payload_overrides[key] = self.payload_extras[key]
                    del self.payload_extras[key]

        return

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

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

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

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

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

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

        if self.attach_as != self.attach_as_default:
            # Provide Attach-As extension details
            params['attach-as'] = self.attach_as

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

        default_port = 443 if self.secure else 80

        return '{schema}://{auth}{hostname}{port}{fullpath}?{params}'.format(
            schema=self.secure_protocol if self.secure else self.protocol,
            auth=auth,
            # never encode hostname since we're expecting it to be a valid one
            hostname=self.host,
            port='' if self.port is None or self.port == default_port
                 else ':{}'.format(self.port),
            fullpath=NotifyForm.quote(self.fullpath, safe='/')
            if self.fullpath else '/',
            params=NotifyForm.urlencode(params),
        )

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

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

        # Apply any/all header over-rides defined
        headers.update(self.headers)

        # Track our potential attachments
        files = []
        if attach:
            for no, attachment in enumerate(attach, start=1):
                # 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

                try:
                    files.append((
                        self.attach_as.format(no)
                        if self.attach_multi_support else self.attach_as, (
                            attachment.name,
                            open(attachment.path, 'rb'),
                            attachment.mimetype)
                    ))

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

            if not self.attach_multi_support and no > 1:
                self.logger.warning(
                    'Multiple attachments provided while '
                    'form:// Multi-Attachment Support not enabled')

        # prepare Form Object
        payload = {}

        for key, value in (
                (FORMPayloadField.VERSION, self.form_version),
                (FORMPayloadField.TITLE, title),
                (FORMPayloadField.MESSAGE, body),
                (FORMPayloadField.MESSAGETYPE, notify_type)):

            if not self.payload_map[key]:
                # Do not store element in payload response
                continue
            payload[self.payload_map[key]] = value

        # Apply any/all payload over-rides defined
        payload.update(self.payload_extras)

        auth = None
        if self.user:
            auth = (self.user, self.password)

        # Set our schema
        schema = 'https' if self.secure else 'http'

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

        url += self.fullpath

        self.logger.debug('Form %s URL: %s (cert_verify=%r)' % (
            self.method, url, self.verify_certificate,
        ))
        self.logger.debug('Form Payload: %s' % str(payload))

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

        if self.method == 'GET':
            method = requests.get
            payload.update(self.params)

        elif self.method == 'PUT':
            method = requests.put

        elif self.method == 'PATCH':
            method = requests.patch

        elif self.method == 'DELETE':
            method = requests.delete

        elif self.method == 'HEAD':
            method = requests.head

        else:  # POST
            method = requests.post

        try:
            r = method(
                url,
                files=None if not files else files,
                data=payload if self.method != 'GET' else None,
                params=payload if self.method == 'GET' else self.params,
                headers=headers,
                auth=auth,
                verify=self.verify_certificate,
                timeout=self.request_timeout,
            )
            if r.status_code < 200 or r.status_code >= 300:
                # We had a problem
                status_str = \
                    NotifyForm.http_response_code_lookup(r.status_code)

                self.logger.warning(
                    'Failed to send Form %s notification: %s%serror=%s.',
                    self.method,
                    status_str,
                    ', ' if status_str else '',
                    str(r.status_code))

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

                # Return; we're done
                return False

            else:
                self.logger.info('Sent Form %s notification.', self.method)

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

            # Return; we're done
            return False

        except (OSError, IOError) as e:
            self.logger.warning(
                'An I/O error occurred while reading one of the '
                'attached files.')
            self.logger.debug('I/O Exception: %s' % str(e))
            return False

        finally:
            for file in files:
                # Ensure all files are closed
                file[1][1].close()

        return True

    @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)
        if not results:
            # We're done early as we couldn't load the results
            return results

        # store any additional payload extra's defined
        results['payload'] = {NotifyForm.unquote(x): NotifyForm.unquote(y)
                              for x, y in results['qsd:'].items()}

        # Add our headers that the user can potentially over-ride if they wish
        # to to our returned result set and tidy entries by unquoting them
        results['headers'] = {NotifyForm.unquote(x): NotifyForm.unquote(y)
                              for x, y in results['qsd+'].items()}

        # Add our GET paramters in the event the user wants to pass these along
        results['params'] = {NotifyForm.unquote(x): NotifyForm.unquote(y)
                             for x, y in results['qsd-'].items()}

        # Allow Attach-As Support which over-rides the name of the filename
        # posted with the form://
        # the default is file01, file02, file03, etc
        if 'attach-as' in results['qsd'] and len(results['qsd']['attach-as']):
            results['attach_as'] = results['qsd']['attach-as']

        # Set method if not otherwise set
        if 'method' in results['qsd'] and len(results['qsd']['method']):
            results['method'] = NotifyForm.unquote(results['qsd']['method'])

        return results