---
- hosts: all
  name: Prompt for variables
  vars_prompt:
    - name: "generate_keys"
      prompt: "Generate SSH keypair for new users?"
      default: yes
      when: generate_keys is not defined
    - name: "enable_sudo_password"
      prompt: "Require user password when running sudo commands?"
      default: yes
      when: enable_sudo_password is not defined
    - name: "disable_gnome_user_list"
      prompt: "Disable the GNOME user list?"
      default: yes
      when: disable_gnome_user_list is not defined

  tasks:
    - name: Load user variables
      include_vars:
        file: users.yml

    - name: Create local user accounts
      block:
        - name: Reconcile user targets with host targets to get host users
          set_fact:
            local_users: "{{ local_users | default([]) + [item if item.targets | intersect(targets) else None] }}"
          with_items: "{{ users }}"

        - name: Create groups
          become: true
          group:
            name: "{{ item }}"
            state: present
          with_items:
            - "{{ targets }}"
            - omni

        - name: Create users
          become: true
          user:
            name: "{{ item.name }}"
            comment: "{{ item.fullname | default('') }}"
            shell: /bin/bash
            groups: "{{ item.targets | intersect(targets) }} + {{ [ 'omni' ] if item.name != 'root' else [] }}"
            system: "{{ item.svc | default('no') }}"
            state: present
            generate_ssh_key: "{{ generate_keys }}"
            password: "{{ item.password }}"
          with_items:
            - "{{ local_users | difference([None]) }}"

    - name: Delete users that have been removed
      block:
        - name: Determine existing users
          shell: 'grep omni /etc/group | cut -d: -f4 | tr "," "\n"'
          changed_when: false
          register: existing_users

        - name: Coallate user names
          set_fact:
            user_names: "{{ user_names | default([]) + [item.name] }}"
          with_items: "{{ users }}"

        - name: Determine removed users
          set_fact:
            removed_users: "{{ existing_users.stdout_lines | difference(user_names) }}"

        - name: Delete removed user accounts
          become: true
          user:
            name: "{{ item }}"
            state: absent
          with_items: "{{ removed_users }}"

    - name: Grant sudo permissions
      block:
        - name: Get administrative users
          set_fact:
            local_admin_users: "{{ local_admin_users | default([]) + [item.name if item.admin else None] }}"
          with_items: "{{ local_users | difference([None]) }}"

        - name: Add users to sudo group on Fedora/CentOS/RHEL
          when: ansible_distribution == "Fedora" or ansible_distribution == "Red Hat Enterprise Linux" or ansible_distribution == "CentOS"
          become: true
          user:
            name: "{{ item.name }}"
            groups: wheel
            state: present
          with_items:
            - "{{ local_users | difference([None]) }}"

        - name: Disable sudo password for ansible
          become: true
          lineinfile:
            create: yes
            path: /etc/sudoers/30-ansible
            line: "ansible ALL=(ALL) NOPASSWD:ALL"
            mode: 0644

        - name: Disable sudo password for admin users
          when: enable_sudo_password is False
          become: true
          lineinfile:
            create: yes
            path: /etc/sudoers/30-ansible
            line: "{{ item }} ALL=(ALL) NOPASSWD:ALL"
            mode: 0644
          with_items:
            - "{{ local_admin_users | difference([None] )}}"

    - name: Configure GNOME
      when: ansible_distribution == "Fedora" and disable_gnome_user_list is True
      block:
        - name: Configure GDM profile
          become: true
          blockinfile:
            path: /etc/ssh/sshd_config
            block: |
              user-db:user
              system-db:gdm
              file-db:/usr/share/gdm/greeter-dconf-defaults

        - name: Configure GDM keyfile
          become: true
          blockinfile:
            path: /etc/dconf/db/gdm.d/00-login-screen
            block: |
              [org/gnome/login-screen]
              # Do not show the user list
              disable-user-list=true

        - name: Delete existing user database
          become: true
          shell: "mv /var/lib/gdm/.config/dconf/user /var/lib/gdm/.config/user.bkup"

        - name: Restart dconf database
          become: true
          shell: dconf update