---
- name: Check if Docker is already installed
  ansible.builtin.command: docker --version
  register: docker_check
  changed_when: false
  failed_when: false

- name: Install Docker (Debian/Ubuntu)
  when:
    - ansible_facts['os_family'] == 'Debian'
    - docker_check.rc != 0
  block:
    - name: Remove old Docker apt repository files
      ansible.builtin.file:
        path: "{{ item }}"
        state: absent
      loop:
        - /etc/apt/sources.list.d/docker.list
        - /etc/apt/keyrings/docker.gpg

    - name: Install prerequisite packages
      ansible.builtin.apt:
        name:
          - apt-transport-https
          - ca-certificates
          - curl
          - gnupg
        state: present
        update_cache: true
        cache_valid_time: 0

    - name: Add Docker GPG key
      ansible.builtin.get_url:
        url: https://download.docker.com/linux/{{ ansible_facts['distribution'] | lower }}/gpg
        dest: "{{ docker_gpg_key_path }}"
        mode: "0644"

    - name: Add Docker repository
      ansible.builtin.deb822_repository:
        name: docker
        types: deb
        uris: https://download.docker.com/linux/{{ ansible_facts['distribution'] | lower }}
        suites: "{{ ansible_facts['distribution_release'] }}"
        components: stable
        signed_by: "{{ docker_gpg_key_path }}"
        state: present

    - name: Install Docker packages
      ansible.builtin.apt:
        name:
          - docker-ce
          - docker-ce-cli
          - containerd.io
          - docker-compose-plugin
        state: present
        update_cache: true
        cache_valid_time: 0

- name: Install Docker (Arch Linux)
  when:
    - ansible_facts['os_family'] == 'Archlinux'
    - docker_check.rc != 0
  block:
    - name: Install Docker packages
      community.general.pacman:
        name:
          - docker
          - docker-compose
        state: present
        update_cache: true

- name: Ensure Docker service is running (systemd)
  ansible.builtin.systemd:
    name: docker
    state: started
    enabled: true
  when: systemd_available.stat.exists

- name: Start Docker daemon manually (no systemd)
  ansible.builtin.shell: nohup dockerd > /var/log/dockerd.log 2>&1 &
  when:
    - not systemd_available.stat.exists
    - docker_check.rc != 0
  changed_when: true

- name: Wait for Docker daemon to be ready
  ansible.builtin.command: docker version
  register: docker_ready
  until: docker_ready.rc == 0
  retries: 10
  delay: 2
  changed_when: false
  when: not systemd_available.stat.exists

- name: Add user to docker group
  ansible.builtin.user:
    name: "{{ ansible_user | default(ansible_facts['user_id']) }}"
    groups: docker
    append: true
  when: ansible_user is defined or ansible_facts['user_id'] is defined