#!/usr/bin/python
# -*- coding: utf-8 -*-

# Benjamin Jolivot <bjolivot@gmail.com>
# Inspired by slack module :
#    # (c) 2017, Steve Pletcher <steve@steve-pletcher.com>
#    # (c) 2016, René Moser <mail@renemoser.net>
#    # (c) 2015, Stefan Berggren <nsg@nsg.cc>
#    # (c) 2014, Ramon de la Fuente <ramon@delafuente.nl>)
#
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)

from __future__ import absolute_import, division, print_function
__metaclass__ = type


DOCUMENTATION = '''
module: mattermost
short_description: Send Mattermost notifications
description:
    - Sends notifications to U(http://your.mattermost.url) via the Incoming WebHook integration.
author: "Benjamin Jolivot (@bjolivot)"
options:
  url:
    type: str
    description:
      - Mattermost url (i.e. http://mattermost.yourcompany.com).
    required: true
  api_key:
    type: str
    description:
      - Mattermost webhook api key. Log into your mattermost site, go to
        Menu -> Integration -> Incoming Webhook -> Add Incoming Webhook.
        This will give you full URL. api_key is the last part.
        http://mattermost.example.com/hooks/C(API_KEY)
    required: true
  text:
    type: str
    description:
      - Text to send. Note that the module does not handle escaping characters.
      - Required when I(attachments) is not set.
  attachments:
    type: list
    elements: dict
    description:
      - Define a list of attachments.
      - For more information, see U(https://developers.mattermost.com/integrate/admin-guide/admin-message-attachments/).
      - Required when I(text) is not set.
    version_added: 4.3.0
  channel:
    type: str
    description:
      - Channel to send the message to. If absent, the message goes to the channel selected for the I(api_key).
  username:
    type: str
    description:
      - This is the sender of the message (Username Override need to be enabled by mattermost admin, see mattermost doc.
    default: Ansible
  icon_url:
    type: str
    description:
      - Url for the message sender's icon.
    default: https://www.ansible.com/favicon.ico
  validate_certs:
    description:
      - If C(no), SSL certificates will not be validated. This should only be used
        on personally controlled sites using self-signed certificates.
    default: yes
    type: bool
'''

EXAMPLES = """
- name: Send notification message via Mattermost
  community.general.mattermost:
    url: http://mattermost.example.com
    api_key: my_api_key
    text: '{{ inventory_hostname }} completed'

- name: Send notification message via Mattermost all options
  community.general.mattermost:
    url: http://mattermost.example.com
    api_key: my_api_key
    text: '{{ inventory_hostname }} completed'
    channel: notifications
    username: 'Ansible on {{ inventory_hostname }}'
    icon_url: http://www.example.com/some-image-file.png

- name: Send attachments message via Mattermost
  community.general.mattermost:
    url: http://mattermost.example.com
    api_key: my_api_key
    attachments:
      - text: Display my system load on host A and B
        color: '#ff00dd'
        title: System load
        fields:
          - title: System A
            value: "load average: 0,74, 0,66, 0,63"
            short: True
          - title: System B
            value: 'load average: 5,16, 4,64, 2,43'
            short: True
"""

RETURN = '''
payload:
    description: Mattermost payload
    returned: success
    type: str
webhook_url:
    description: URL the webhook is sent to
    returned: success
    type: str
'''

from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.urls import fetch_url


def main():
    module = AnsibleModule(
        supports_check_mode=True,
        argument_spec=dict(
            url=dict(type='str', required=True),
            api_key=dict(type='str', required=True, no_log=True),
            text=dict(type='str'),
            channel=dict(type='str', default=None),
            username=dict(type='str', default='Ansible'),
            icon_url=dict(type='str', default='https://www.ansible.com/favicon.ico'),
            validate_certs=dict(default=True, type='bool'),
            attachments=dict(type='list', elements='dict'),
        ),
        required_one_of=[
            ('text', 'attachments'),
        ],
    )
    # init return dict
    result = dict(changed=False, msg="OK")

    # define webhook
    webhook_url = "{0}/hooks/{1}".format(module.params['url'], module.params['api_key'])
    result['webhook_url'] = webhook_url

    # define payload
    payload = {}
    for param in ['text', 'channel', 'username', 'icon_url', 'attachments']:
        if module.params[param] is not None:
            payload[param] = module.params[param]

    payload = module.jsonify(payload)
    result['payload'] = payload

    # http headers
    headers = {
        'Content-Type': 'application/json',
        'Accept': 'application/json',
    }

    # notes:
    # Nothing is done in check mode
    # it'll pass even if your server is down or/and if your token is invalid.
    # If someone find good way to check...

    # send request if not in test mode
    if module.check_mode is False:
        response, info = fetch_url(module=module, url=webhook_url, headers=headers, method='POST', data=payload)

        # something's wrong
        if info['status'] != 200:
            # some problem
            result['msg'] = "Failed to send mattermost message, the error was: {0}".format(info['msg'])
            module.fail_json(**result)

    # Looks good
    module.exit_json(**result)


if __name__ == '__main__':
    main()