---
- name: Get nix version
  shell: |
    . /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
    nix --version
  ignore_errors: true
  changed_when: false
  register: nix_version_output
- name: Set nix version name
  set_fact:
    nix_version_on_system: "{{ (nix_version_output.stdout_lines[0] | split(' '))[2] }}"
  when: nix_version_output.rc == 0
- name: Download and run installer
  block:
    - name: Download installer
      get_url:
        url: "{{ installer_path }}"
        dest: /tmp
        checksum: "{{ installer_checksum }}"
    - name: extract installer
      unarchive:
        src: /tmp/{{ nix_build }}.tar.xz
        remote_src: true
        dest: /tmp/
    - name: Uninistall the previous nix
      block:
        - name: disable nix socket
          service:
            name: nix-daemon.socket
            state: stopped
            enabled: false
          become: true
          ignore_errors: true
        - name: disable nix service
          service:
            name: nix-daemon.service
            state: stopped
            enabled: false
          become: true
          ignore_errors: true
        - name: Remove Installed nix files
          file:
            state: absent
            path: /nix
          become: true
        - name: Remove Installed nix config files
          file:
            state: absent
            path: /etc/nix
          become: true
        - name: stat bash.bashrc.backup-before-nix
          stat:
            path: /etc/bash.bashrc.backup-before-nix
          register: bash_bashrc_backup_stat
        - name: Restore bash.bashrc
          shell: mv /etc/bash.bashrc.backup-before-nix /etc/bash.bashrc
          become: true
          when: bash_bashrc_backup_stat.stat.exists
        - name: stat bashrc.backup-before-nix
          stat:
            path: /etc/bashrc.backup-before-nix
          register: bashrc_backup_stat
        - name: Restore bashrc
          shell: mv /etc/bashrc.backup-before-nix /etc/bashrc
          become: true
          when: bashrc_backup_stat.stat.exists
        - name: stat zshrc.backup-before-nix
          stat:
            path: /etc/zshrc.backup-before-nix
          register: zshrc_backup_stat
        - name: Restore zshrc
          shell: mv /etc/zshrc.backup-before-nix /etc/zshrc
          become: true
          when: zshrc_backup_stat.stat.exists
        - name: stat nix.sh
          stat:
            path: /etc/profile.d/nix.sh.backup-before-nix
          register: nixsh_backup_stat
        - name: Restore nix.sh
          shell: mv /etc/profile.d/nix.sh.backup-before-nix /etc/profile.d/nix.sh
          become: true
          when: nixsh_backup_stat.stat.exists
      when: nix_version_on_system is defined and nix_version_on_system != nix_version
    - name: Run the installer
      become: true
      ansible.builtin.shell:
        cmd: ./install --daemon </dev/null
        chdir: /tmp/{{ nix_build }}
  when: (not nix_version_on_system is defined) or nix_version_on_system != nix_version
- name: Enable flakes
  become: true
  lineinfile:
    path: /etc/nix/nix.conf
    line: "experimental-features = nix-command flakes"
  when: flakes
- name: Add arbritrary nix config
  blockinfile:
    path: /etc/nix/nix.conf
    block: "{{ config }}"
  become: true
  when: config is defined
- name: run nix commands
  shell: |
      . /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
      {{ item }}
  changed_when: true
  loop: "{{ nix_commands }}"