# coding:utf-8

# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2019 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENSE.TXT

from __future__ import print_function
from __future__ import division
from __future__ import absolute_import
import re
import subprocess

from requests import Session


class ZendeskAPIError(Exception):
    def __init__(self, message):
        self.message = message
        super(ZendeskAPIError, self).__init__(message)


_API_URL_TMPL = 'https://cloudlinux.zendesk.com/api/v2/{}'
_HC_URL_TMPL = 'https://cloudlinux.zendesk.com/hc/requests/{}'
CONTACT_SUPPORT_STRING = 'Please contact Cloudlinux support at https://cloudlinux.zendesk.com/hc/requests/new'

# Identifiers for custom fields in API
_PRODUCT_ID = 33267569
_DOCTOR_ID = 43297669
_CLN_ID = 43148369
_AGREEMENT = 12355021509788


def send_to_support(request_data):
    params = request_data.get('params', {})
    doctor_key = None
    if params.get('clDoctor') == 'true':
        # Generating doctor and extracting key from output
        try:
            doctor_key = _get_doctor_key()
        except Exception:
            doctor_key = None

    # Sending request via Zendesk API
    # https://developer.zendesk.com/rest_api/docs/core/requests#anonymous-requests
    ticket_url = _send_request(
        params.get('email'),
        params.get('subject'),
        params.get('description'),
        doctor_key,
        params.get('cln'),
        params.get('agreement'),
        request_data.get('attachments'))
    return ticket_url


def _send_request(sender_email,
                 subject,
                 description,
                 doctor_key=None,
                 cln=None,
                 agreement=None,
                 attachments=None):
    """
    Send request to support via Zendesk API
    """
    with Session() as session:

        # Uploading attachments to Zendesk
        upload_token =  _upload_attachments(attachments, session)

        # Creating comment object: setting description and attaching
        # uploads token
        comment = dict(body=description + "\n\n [This ticket was created from CloudLinux Manager]")
        if upload_token is not None:
            comment['uploads'] = [upload_token]

        # Author of request
        requester = dict(name=sender_email,
                         email=sender_email)

        # Custom fields for support convenience
        custom_fields = [{'id': _PRODUCT_ID,
                          'value': 'cloudlinux'}]

        if doctor_key:
            custom_fields.append(
                {'id': _DOCTOR_ID,
                 'value': doctor_key})

        if cln:
            custom_fields.append(
                {'id': _CLN_ID,
                 'value': cln})

        if agreement:
            custom_fields.append(
                {'id': _AGREEMENT,
                 'value': agreement})

        # Ready request
        request = dict(
            requester=requester,
            subject=subject,
            comment=comment,
            custom_fields=custom_fields
        )

        return _post_request(request, session)


def _post_request(request, session):
    resp = session.post(_API_URL_TMPL.format('requests.json'),
                        json={'request': request})

    data = resp.json(encoding='utf-8')
    if resp.status_code == 201:
        ticket_id = data.get('request', {}).get('id')
        if data.get('request'):
            return _HC_URL_TMPL.format(data['request']['id'])
        elif data.get('suspended_ticket'):
            raise ZendeskAPIError(
                data['suspended_ticket']['cause'] + '. ' + CONTACT_SUPPORT_STRING)
    raise ZendeskAPIError('Zendesk api error. ' + CONTACT_SUPPORT_STRING)


def _upload_attachments(attachments, session):
    # Uploading attachments to Zendesk
    upload_token = None
    if attachments is None:
        return upload_token

    for attachment in attachments:
        attachment_file = open(attachment['file'], 'rb')
        params = {'filename': attachment['name']}
        if upload_token is not None:
            params['token'] = upload_token

        resp = session.post(
                _API_URL_TMPL.format('uploads.json'),
                data=attachment_file.read(),
                headers={'Content-Type': 'application/binary'},
                params=params)
        result = resp.json(encoding='utf-8')
        if resp.status_code != 201:
            continue

        if upload_token is None:
            upload_token = result['upload']['token']
        attachment_file.close()
    return upload_token

def _get_doctor_key():
    command = ['/bin/bash',
               '-c',
               'curl -s https://repo.cloudlinux.com/cloudlinux/cldoctor/cldoctor.sh | bash']
    response = subprocess.check_output(command, stderr=subprocess.STDOUT, text=True)
    result = re.search('Key: ([^\n]+)\n', response)
    return result.group(1)