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

# 2018, Simon Dodsley (simon@purestorage.com)
# 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

ANSIBLE_METADATA = {'metadata_version': '1.1',
                    'status': ['preview'],
                    'supported_by': 'community'}

DOCUMENTATION = r'''
---
module: purefb_alert
version_added: '1.0.0'
short_description: Configure Pure Storage FlashBlade alert email settings
description:
- Configure alert email configuration for Pure Storage FlashArrays.
- Add or delete an individual syslog server to the existing
  list of serves.
author:
- Pure Storage Ansible Team (@sdodsley) <pure-ansible-team@purestorage.com>
options:
  state:
    type: str
    description:
    - Create or delete alert email
    default: present
    choices: [ absent, present ]
  address:
    type: str
    description:
    - Email address (valid format required)
    required: true
  enabled:
    type: bool
    default: true
    description:
    - Set specified email address to be enabled or disabled
  severity:
    type: str
    description:
    - The minimum severity that an alert must have in order for
      emails to be sent to the array's alert watchers
    default: info
    choices: [ info, warning, critical ]
extends_documentation_fragment:
- purestorage.flashblade.purestorage.fb
'''

EXAMPLES = r'''
- name: Add new email recipient and enable, or enable existing email
  purefb_alert:
    address: "user@domain.com"
    enabled: true
    state: present
    fb_url: 10.10.10.2
    api_token: e31060a7-21fc-e277-6240-25983c6c4592
- name: Delete existing email recipient
  purefb_alert:
    state: absent
    address: "user@domain.com"
    fb_url: 10.10.10.2
    api_token: e31060a7-21fc-e277-6240-25983c6c4592
'''

RETURN = r'''
'''


HAS_PURITY_FB = True
try:
    from purity_fb import AlertWatcher
except ImportError:
    HAS_PURITY_FB = False


import re
from ansible.module_utils.basic import AnsibleModule
from ansible_collections.purestorage.flashblade.plugins.module_utils.purefb import get_blade, purefb_argument_spec


MIN_REQUIRED_API_VERSION = '1.9'


def create_alert(module, blade):
    """Create Alert Email"""
    changed = True
    if not module.check_mode:
        api_version = blade.api_version.list_versions().versions
        if MIN_REQUIRED_API_VERSION in api_version:
            watcher_settings = AlertWatcher(minimum_notification_severity=module.params['severity'])
            try:
                blade.alert_watchers.create_alert_watchers(names=[module.params['address']],
                                                           watcher_settings=watcher_settings)
            except Exception:
                module.fail_json(msg='Failed to create alert email: {0}'.format(module.params['address']))
        else:
            try:
                blade.alert_watchers.create_alert_watchers(names=[module.params['address']])
            except Exception:
                module.fail_json(msg='Failed to create alert email: {0}'.format(module.params['address']))
        if not module.params['enabled']:
            watcher_settings = AlertWatcher(enabled=module.params['enabled'])
            try:
                blade.alert_watchers.update_alert_watchers(names=[module.params['address']], watcher_settings=watcher_settings)
            except Exception:
                module.fail_json(msg='Failed to disable during create alert email: {0}'.format(module.params['address']))
    module.exit_json(changed=changed)


def update_alert(module, blade):
    """Update alert Watcher"""
    changed = True
    if not module.check_mode:
        api_version = blade.api_version.list_versions().versions
        mod_alert = False
        try:
            alert = blade.alert_watchers.list_alert_watchers(names=[module.params['address']])
        except Exception:
            module.fail_json(msg='Failed to get information for alert email: {0}'.format(module.params['address']))
        current_state = {'enabled': alert.items[0].enabled,
                         'severity': alert.items[0].minimum_notification_severity
                         }
        if current_state['enabled'] != module.params['enabled']:
            mod_alert = True
        if MIN_REQUIRED_API_VERSION in api_version:
            if current_state['severity'] != module.params['severity']:
                mod_alert = True
        if mod_alert:
            if MIN_REQUIRED_API_VERSION in api_version:
                watcher_settings = AlertWatcher(enabled=module.params['enabled'],
                                                minimum_notification_severity=module.params['severity'])
            else:
                watcher_settings = AlertWatcher(enabled=module.params['enabled'])
            try:
                blade.alert_watchers.update_alert_watchers(names=[module.params['address']], watcher_settings=watcher_settings)
            except Exception:
                module.fail_json(msg='Failed to update alert email: {0}'.format(module.params['address']))
        else:
            changed = False
    module.exit_json(changed=changed)


def delete_alert(module, blade):
    """Delete Alert Email"""
    changed = False
    if not module.check_mode:
        try:
            blade.alert_watchers.delete_alert_watchers(names=[module.params['address']])
        except Exception:
            module.fail_json(msg='Failed to delete alert email: {0}'.format(module.params['address']))
    changed = True

    module.exit_json(changed=changed)


def main():
    argument_spec = purefb_argument_spec()
    argument_spec.update(dict(
        address=dict(type='str', required=True),
        enabled=dict(type='bool', default=True),
        severity=dict(type='str', default='info', choices=['info', 'warning', 'critical']),
        state=dict(type='str', default='present', choices=['absent', 'present']),
    ))

    module = AnsibleModule(argument_spec,
                           supports_check_mode=True)

    if not HAS_PURITY_FB:
        module.fail_json(msg='purity_fb SDK is required for this module')

    pattern = re.compile(r"^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$")
    if not pattern.match(module.params['address']):
        module.fail_json(msg='Valid email address not provided.')

    blade = get_blade(module)

    exists = False
    try:
        emails = blade.alert_watchers.list_alert_watchers()
    except Exception:
        module.fail_json(msg='Failed to get exisitng email list')
    for email in range(0, len(emails.items)):
        if emails.items[email].name == module.params['address']:
            exists = True
            break
    if module.params['state'] == 'present' and not exists:
        create_alert(module, blade)
    elif module.params['state'] == 'present' and exists:
        update_alert(module, blade)
    elif module.params['state'] == 'absent' and exists:
        delete_alert(module, blade)

    module.exit_json(changed=False)


if __name__ == '__main__':
    main()
