---
# Copyright (C) 2018-2020 Robert Wimmer
# SPDX-License-Identifier: GPL-3.0-or-later

- name: Gather instance facts
  setup:

# Installing WireGuard [[[1
- include_tasks: "{{ item }}"
  with_first_found:
    - "setup-{{ ansible_distribution|lower }}-{{ ansible_distribution_major_version }}.yml"
    - "setup-{{ ansible_distribution|lower }}-{{ ansible_distribution_version }}.yml"
    - "setup-{{ ansible_distribution|lower }}-{{ ansible_distribution_release }}.yml"
    - "setup-{{ ansible_distribution|lower }}.yml"
    - "setup-{{ ansible_os_family|lower }}.yml"

- name: Enable WireGuard kernel module
  modprobe:
    name: wireguard
    state: present
  register: wireguard__register_module_enabled
  until:  wireguard__register_module_enabled is succeeded
  retries: 10
  delay: 10
  failed_when: wireguard__register_module_enabled is failure
  tags:
    - wg-install
  when: not ansible_os_family == 'Darwin'

# Key handling [[[1
- name: Register if config/private key already exists on target host
  stat:
    path: "{{ wireguard_remote_directory }}/{{ wireguard_interface }}.conf"
  register: wireguard__register_config_file
  tags:
    - wg-generate-keys
    - wg-config

- name: Get wg subcommands
  command: "wg --help"
  register: wireguard__register_subcommands
  changed_when: false

- name: Check if wg syncconf subcommand is available
  set_fact:
    wg_syncconf: "{{ 'syncconf:' in wireguard__register_subcommands.stdout }}"

- name: Show syncconf subcommand status
  debug:
    var: wg_syncconf

- block:
  - name: Generate WireGuard private key
    command: "wg genkey"
    register: wireguard__register_private_key
    changed_when: false
    tags:
      - wg-generate-keys

  - name: Set private key fact
    set_fact:
      wireguard__fact_private_key: "{{ wireguard__register_private_key.stdout }}"
    tags:
      - wg-generate-keys
  when: not wireguard__register_config_file.stat.exists

- block:
  - name: Read WireGuard config file
    slurp:
      src: "{{ wireguard_remote_directory }}/{{ wireguard_interface }}.conf"
    register: wireguard__register_config
    tags:
      - wg-config

  - name: Set private key fact
    set_fact:
      wireguard__fact_private_key: "{{ wireguard__register_config['content'] | b64decode | regex_findall('PrivateKey = (.*)') | first }}"
    tags:
      - wg-config
  when: wireguard__register_config_file.stat.exists

- name: Derive WireGuard public key
  command: "wg pubkey"
  args:
    stdin: "{{ wireguard__fact_private_key }}"
  register: wireguard__register_public_key
  changed_when: false
  tags:
    - wg-config

- name: Set public key fact
  set_fact:
    wireguard__fact_public_key: "{{ wireguard__register_public_key.stdout }}"
  tags:
    - wg-config

# Configuration [[[1
- name: Create WireGuard configuration directory
  file:
    dest: "{{ wireguard_remote_directory }}"
    state: directory
    mode: 0700
  tags:
    - wg-config

- name: Generate WireGuard configuration file
  template:
    src: etc/wireguard/wg.conf.j2
    dest: "{{ wireguard_remote_directory }}/{{ wireguard_interface }}.conf"
    owner: "{{ wireguard_conf_owner }}"
    group: "{{ wireguard_conf_group }}"
    mode: "{{ wireguard_conf_mode }}"
  tags:
    - wg-config
  notify:
    - reconfigure wireguard

- name: Ensure legacy reload-module-on-update is absent
  file:
    dest: "{{ wireguard_remote_directory }}/.reload-module-on-update"
    state: absent
  tags:
    - wg-config

# Service [[[1
- name: Start and enable WireGuard service
  service:
    name: "wg-quick@{{ wireguard_interface }}"
    state: started
    enabled: yes
  when: not ansible_os_family == 'Darwin'