#!/usr/bin/python
#
# Copyright Ansible Project
# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
# SPDX-License-Identifier: GPL-3.0-or-later

from __future__ import annotations

DOCUMENTATION = r"""
module: pagerduty
short_description: Create PagerDuty maintenance windows
description:
  - This module lets you create PagerDuty maintenance windows.
author:
  - "Andrew Newdigate (@suprememoocow)"
  - "Dylan Silva (@thaumos)"
  - "Justin Johns (!UNKNOWN)"
  - "Bruce Pennypacker (@bpennypacker)"
requirements:
  - PagerDuty API access
extends_documentation_fragment:
  - community.general.attributes
attributes:
  check_mode:
    support: none
  diff_mode:
    support: none
options:
  state:
    type: str
    description:
      - Create a maintenance window or get a list of ongoing windows.
    required: true
    choices: ["running", "started", "ongoing", "absent"]
  name:
    type: str
    description:
      - PagerDuty unique subdomain. Obsolete. It is not used with PagerDuty REST v2 API.
  user:
    type: str
    description:
      - PagerDuty user ID. Obsolete. Please, use O(token) for authorization.
  token:
    type: str
    description:
      - A pagerduty token, generated on the pagerduty site. It is used for authorization.
    required: true
  requester_id:
    type: str
    description:
      - ID of user making the request. Only needed when creating a maintenance_window.
  service:
    type: list
    elements: str
    description:
      - A comma separated list of PagerDuty service IDs.
    aliases: [services]
  window_id:
    type: str
    description:
      - ID of maintenance window. Only needed when absent a maintenance_window.
  hours:
    type: str
    description:
      - Length of maintenance window in hours.
    default: '1'
  minutes:
    type: str
    description:
      - Maintenance window in minutes (this is added to the hours).
    default: '0'
  desc:
    type: str
    description:
      - Short description of maintenance window.
    default: Created by Ansible
  validate_certs:
    description:
      - If V(false), SSL certificates are not validated. This should only be used on personally controlled sites using self-signed
        certificates.
    type: bool
    default: true
"""

EXAMPLES = r"""
- name: List ongoing maintenance windows using a token
  community.general.pagerduty:
    name: companyabc
    token: xxxxxxxxxxxxxx
    state: ongoing

- name: Create a 1 hour maintenance window for service FOO123
  community.general.pagerduty:
    name: companyabc
    user: example@example.com
    token: yourtoken
    state: running
    service: FOO123

- name: Create a 5 minute maintenance window for service FOO123
  community.general.pagerduty:
    name: companyabc
    token: xxxxxxxxxxxxxx
    hours: 0
    minutes: 5
    state: running
    service: FOO123


- name: Create a 4 hour maintenance window for service FOO123 with the description "deployment"
  community.general.pagerduty:
    name: companyabc
    user: example@example.com
    state: running
    service: FOO123
    hours: 4
    desc: deployment
  register: pd_window

- name: Delete the previous maintenance window
  community.general.pagerduty:
    name: companyabc
    user: example@example.com
    state: absent
    window_id: '{{ pd_window.result.maintenance_window.id }}'

# Delete a maintenance window from a separate playbook than its creation,
# and if it is the only existing maintenance window
- name: Check
  community.general.pagerduty:
    requester_id: XXXXXXX
    token: yourtoken
    state: ongoing
  register: pd_window

- name: Delete
  community.general.pagerduty:
    requester_id: XXXXXXX
    token: yourtoken
    state: absent
    window_id: "{{ pd_window.result.maintenance_windows[0].id }}"
"""

import datetime
import json

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

from ansible_collections.community.general.plugins.module_utils.datetime import (
    now,
)


class PagerDutyRequest:
    def __init__(self, module, name, user, token):
        self.module = module
        self.name = name
        self.user = user
        self.token = token
        self.headers = {
            "Content-Type": "application/json",
            "Authorization": self._auth_header(),
            "Accept": "application/vnd.pagerduty+json;version=2",
        }

    def ongoing(self, http_call=fetch_url):
        url = "https://api.pagerduty.com/maintenance_windows?filter=ongoing"
        headers = dict(self.headers)

        response, info = http_call(self.module, url, headers=headers)
        if info["status"] != 200:
            self.module.fail_json(msg=f"failed to lookup the ongoing window: {info['msg']}")

        json_out = self._read_response(response)

        return False, json_out, False

    def create(self, requester_id, service, hours, minutes, desc, http_call=fetch_url):
        if not requester_id:
            self.module.fail_json(msg="requester_id is required when maintenance window should be created")

        url = "https://api.pagerduty.com/maintenance_windows"

        headers = dict(self.headers)
        headers.update({"From": requester_id})

        start, end = self._compute_start_end_time(hours, minutes)
        services = self._create_services_payload(service)

        request_data = {
            "maintenance_window": {"start_time": start, "end_time": end, "description": desc, "services": services}
        }

        data = json.dumps(request_data)
        response, info = http_call(self.module, url, data=data, headers=headers, method="POST")
        if info["status"] != 201:
            self.module.fail_json(msg=f"failed to create the window: {info['msg']}")

        json_out = self._read_response(response)

        return False, json_out, True

    def _create_services_payload(self, service):
        if isinstance(service, list):
            return [{"id": s, "type": "service_reference"} for s in service]
        else:
            return [{"id": service, "type": "service_reference"}]

    def _compute_start_end_time(self, hours, minutes):
        now_t = now()
        later = now_t + datetime.timedelta(hours=int(hours), minutes=int(minutes))
        start = now_t.strftime("%Y-%m-%dT%H:%M:%SZ")
        end = later.strftime("%Y-%m-%dT%H:%M:%SZ")
        return start, end

    def absent(self, window_id, http_call=fetch_url):
        url = f"https://api.pagerduty.com/maintenance_windows/{window_id}"
        headers = dict(self.headers)

        response, info = http_call(self.module, url, headers=headers, method="DELETE")
        if info["status"] != 204:
            self.module.fail_json(msg=f"failed to delete the window: {info['msg']}")

        json_out = self._read_response(response)

        return False, json_out, True

    def _auth_header(self):
        return f"Token token={self.token}"

    def _read_response(self, response):
        try:
            return json.loads(response.read())
        except Exception:
            return ""


def main():
    module = AnsibleModule(
        argument_spec=dict(
            state=dict(required=True, choices=["running", "started", "ongoing", "absent"]),
            name=dict(),
            user=dict(),
            token=dict(required=True, no_log=True),
            service=dict(type="list", elements="str", aliases=["services"]),
            window_id=dict(),
            requester_id=dict(),
            hours=dict(default="1"),  # @TODO change to int?
            minutes=dict(default="0"),  # @TODO change to int?
            desc=dict(default="Created by Ansible"),
            validate_certs=dict(default=True, type="bool"),
        )
    )

    state = module.params["state"]
    name = module.params["name"]
    user = module.params["user"]
    service = module.params["service"]
    window_id = module.params["window_id"]
    hours = module.params["hours"]
    minutes = module.params["minutes"]
    token = module.params["token"]
    desc = module.params["desc"]
    requester_id = module.params["requester_id"]

    pd = PagerDutyRequest(module, name, user, token)

    if state == "running" or state == "started":
        if not service:
            module.fail_json(msg="service not specified")
        (rc, out, changed) = pd.create(requester_id, service, hours, minutes, desc)
        if rc == 0:
            changed = True

    if state == "ongoing":
        (rc, out, changed) = pd.ongoing()

    if state == "absent":
        (rc, out, changed) = pd.absent(window_id)

    if rc != 0:
        module.fail_json(msg="failed", result=out)

    module.exit_json(msg="success", result=out, changed=changed)


if __name__ == "__main__":
    main()
