#!/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"""
    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:
        changed = True
        if not module.check_mode:
            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 = True
    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"])
            )

    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()