- name: Check if the governor is already installed
  ansible.builtin.command:
    argv:
      - pacman
      - -Qq
      - cyan-skillfish-governor-smu
  register: is_gov_installed
  changed_when: false
  failed_when: false

- name: Build and install the governor from the AUR
  when: is_gov_installed.rc != 0
  block:
    - name: Create temporary dir for build
      ansible.builtin.tempfile:
        state: directory
        suffix: csgov
      register: gov_tmp

    - name: Download the AUR snapshot
      ansible.builtin.get_url:
        url: "https://aur.archlinux.org/cgit/aur.git/snapshot/cyan-skillfish-governor-smu.tar.gz"
        dest: "{{ gov_tmp.path }}/cyan-skillfish-governor-smu.tar.gz"

    - name: Extract the snapshot
      ansible.builtin.unarchive:
        src: "{{ gov_tmp.path }}/cyan-skillfish-governor-smu.tar.gz"
        dest: "{{ gov_tmp.path }}"
        remote_src: true

    - name: Read the package metadata
      ansible.builtin.slurp:
        src: "{{ gov_tmp.path }}/cyan-skillfish-governor-smu/.SRCINFO"
      register: gov_srcinfo

    - name: Extract build and runtime dependencies
      ansible.builtin.set_fact:
        gov_build_deps: >-
          {{ (gov_srcinfo.content | b64decode)
             | regex_findall('(?m)^\s*(?:make|check)?depends(?:_\w+)?\s*=\s*([^\s<>=]+)')
             | unique }}

    - name: Ensure build prerequisites are present
      become: true
      ansible.builtin.pacman:
        name: "{{ ['base-devel', 'fakeroot'] + gov_build_deps }}"
        state: present

    # Rust build, expect several minutes on Zen 2.
    - name: Build the package (no install)
      ansible.builtin.command:
        argv:
          - makepkg
          - --noconfirm
        chdir: "{{ gov_tmp.path }}/cyan-skillfish-governor-smu"
      environment:
        PKGDEST: "{{ gov_tmp.path }}/cyan-skillfish-governor-smu"

    - name: Locate built package(s)
      ansible.builtin.find:
        paths: "{{ gov_tmp.path }}/cyan-skillfish-governor-smu"
        patterns: "*.pkg.tar.zst"
        excludes: "*-debug-*"
        file_type: file
      register: gov_built_pkgs

    # Install with root, but OUTSIDE makepkg
    - name: Install built package(s)
      become: true
      ansible.builtin.command:
        argv:
          - pacman
          - -U
          - --noconfirm
          - "{{ item.path }}"
      loop: "{{ gov_built_pkgs.files }}"
      notify: Restart the GPU governor

  always:
    - name: Remove temporary directory
      ansible.builtin.file:
        path: "{{ gov_tmp.path }}"
        state: absent
      when: gov_tmp.path is defined

- name: Deploy the governor configuration
  become: true
  ansible.builtin.template:
    src: config.toml.j2
    dest: /etc/cyan-skillfish-governor-smu/config.toml
    mode: '0644'
  notify: Restart the GPU governor

- name: Enable and start the GPU governor
  become: true
  ansible.builtin.systemd_service:
    name: cyan-skillfish-governor-smu
    enabled: true
    state: started