---
# swapfile role — provisions a swap file of configurable size
#
# Variables (set per-host in host_vars):
#   swap_size_gb:    size in gigabytes (default: 4)
#   swap_swappiness: vm.swappiness value (default: 10)

- name: Check if swapfile exists with correct size
  ansible.builtin.stat:
    path: /swapfile
  register: swapfile_stat

- name: Allocate swapfile (fallocate)
  ansible.builtin.command:
    cmd: "fallocate -l {{ (swap_size_gb | default(4)) | int }}G /swapfile"
    creates: /swapfile
  when: not swapfile_stat.stat.exists

- name: Set swapfile permissions
  ansible.builtin.file:
    path: /swapfile
    owner: root
    group: root
    mode: '0600'

- name: Format swapfile
  ansible.builtin.command:
    cmd: mkswap /swapfile
  when: not swapfile_stat.stat.exists

- name: Enable swapfile
  ansible.builtin.command:
    cmd: swapon /swapfile
  when: not swapfile_stat.stat.exists
  ignore_errors: true  # already active is not an error

- name: Ensure swapfile in /etc/fstab
  ansible.builtin.lineinfile:
    path: /etc/fstab
    regexp: '^/swapfile'
    line: '/swapfile none swap sw 0 0'
    state: present

- name: Set vm.swappiness at runtime
  ansible.posix.sysctl:
    name: vm.swappiness
    value: "{{ swap_swappiness | default(10) }}"
    state: present
    reload: true

- name: Persist vm.swappiness across reboots
  ansible.builtin.copy:
    dest: /etc/sysctl.d/60-swappiness.conf
    owner: root
    group: root
    mode: '0644'
    content: |
      # Managed by Ansible (swapfile role)
      vm.swappiness = {{ swap_swappiness | default(10) }}