---
- name: Install prerequisites
  ansible.builtin.package:
    name:
      - python3
      - python3-pip
      - python3-venv
      - curl
    state: present
  become: true

- name: Create Hermes group
  ansible.builtin.group:
    name: "{{ hermes_group }}"
    system: true
    state: present
  become: true

- name: Create Hermes user
  ansible.builtin.user:
    name: "{{ hermes_user }}"
    group: "{{ hermes_group }}"
    home: "{{ hermes_data_dir }}"
    shell: /usr/sbin/nologin
    system: true
    create_home: false
    state: present
  become: true

- name: Get Hermes release info from GitHub
  ansible.builtin.uri:
    url: >-
      {{ 'https://api.github.com/repos/NousResearch/hermes-agent/releases/latest'
         if hermes_version == ''
         else 'https://api.github.com/repos/NousResearch/hermes-agent/releases/tags/v' + hermes_version }}
    headers:
      Accept: "application/vnd.github.v3+json"
    return_content: true
  register: _hermes_release

- name: Set version and download URL facts
  ansible.builtin.set_fact:
    _hermes_version_tag: "{{ _hermes_release.json.tag_name }}"
    _hermes_whl_url: >-
      {{ _hermes_release.json.assets
         | selectattr('name', 'search', '\.whl$')
         | map(attribute='browser_download_url')
         | first }}

- name: Read installed version
  ansible.builtin.slurp:
    src: "{{ hermes_install_dir }}/.version"
  register: _hermes_installed_raw
  ignore_errors: true
  become: true

- name: Set installed version fact
  ansible.builtin.set_fact:
    _hermes_installed_version: >-
      {{ (_hermes_installed_raw.content | b64decode | trim)
         if _hermes_installed_raw is not failed else '' }}

- name: Install or upgrade Hermes
  when: _hermes_installed_version != _hermes_version_tag
  block:
    - name: Create Hermes installation directory
      ansible.builtin.file:
        path: "{{ hermes_install_dir }}"
        state: directory
        owner: "{{ hermes_user }}"
        group: "{{ hermes_group }}"
        mode: '0755'
      become: true

    - name: Create Python virtual environment
      ansible.builtin.command:
        cmd: python3 -m venv {{ hermes_install_dir }}/venv
        creates: "{{ hermes_install_dir }}/venv/bin/python"
      become: true
      become_user: "{{ hermes_user }}"

    - name: Download Hermes wheel
      ansible.builtin.get_url:
        url: "{{ _hermes_whl_url }}"
        dest: /tmp/hermes.whl
        mode: '0644'

    - name: Install Hermes wheel into virtualenv
      ansible.builtin.pip:
        name: /tmp/hermes.whl
        virtualenv: "{{ hermes_install_dir }}/venv"
        state: present
      become: true
      become_user: "{{ hermes_user }}"

    - name: Write installed version file
      ansible.builtin.copy:
        content: "{{ _hermes_version_tag }}"
        dest: "{{ hermes_install_dir }}/.version"
        owner: "{{ hermes_user }}"
        group: "{{ hermes_group }}"
        mode: '0644'
      become: true

    - name: Remove downloaded wheel
      ansible.builtin.file:
        path: /tmp/hermes.whl
        state: absent

- name: Create Hermes data directory
  ansible.builtin.file:
    path: "{{ hermes_data_dir }}"
    state: directory
    owner: "{{ hermes_user }}"
    group: "{{ hermes_group }}"
    mode: '0750'
  become: true

- name: Create Hermes systemd service
  ansible.builtin.template:
    src: hermes.service.j2
    dest: /etc/systemd/system/hermes.service
    mode: '0644'
  become: true

- name: Enable and start Hermes service
  ansible.builtin.systemd:
    name: hermes
    enabled: "{{ hermes_service_enabled }}"
    state: "{{ hermes_service_state }}"
    daemon_reload: true
  become: true