---
# Preflight checks — equivalent of Project-Includes/PreflightCheck.sh +
# pi-detect.sh. In Ansible, `become: true` replaces the root-user check.
# Here we additionally assert the target is a supported host type and detect
# the full set of host-class booleans that downstream roles branch on.

# ---------------------------------------------------------------------------
# Assert supported OS
# ---------------------------------------------------------------------------
- name: Assert host runs a supported Debian-family distribution
  ansible.builtin.assert:
    that:
      - ansible_facts.os_family == "Debian"
    fail_msg: >-
      Refusing to provision {{ inventory_hostname }}: only Debian-family hosts
      are supported (got OS family "{{ ansible_facts.os_family }}").
    success_msg: >-
      Preflight OK — {{ inventory_hostname }} is
      {{ ansible_facts.distribution }} {{ ansible_facts.distribution_version }}.

# ---------------------------------------------------------------------------
# Dynamic detections (run on the target host)
# ---------------------------------------------------------------------------

- name: Detect physical Dell host (dmidecode)  # noqa var-naming[no-role-prefix]
  ansible.builtin.shell: |
    set -o pipefail
    /usr/sbin/dmidecode -t system 2>/dev/null | grep -c Dell || true
  register: _dell_check
  changed_when: false
  failed_when: false

- name: Detect Proxmox VE host  # noqa var-naming[no-role-prefix]
  ansible.builtin.shell: |
    # Proxmox VE is installed if the proxmox-ve package is present OR the
    # /etc/pve cluster FS is mounted.
    dpkg-query -W -f='${Status}' proxmox-ve 2>/dev/null | grep -c 'install ok installed' || true
  register: _proxmox_check
  changed_when: false
  failed_when: false

- name: Detect virtualization type (virt-what)  # noqa var-naming[no-role-prefix]
  ansible.builtin.command: virt-what
  register: _virt_what
  changed_when: false
  failed_when: false

- name: Detect Raspberry Pi (device-tree model file)  # noqa var-naming[no-role-prefix]
  ansible.builtin.stat:
    path: /sys/firmware/devicetree/base/model
  register: _raspi_model

- name: Detect existing system users
  ansible.builtin.getent:
    database: passwd

# ---------------------------------------------------------------------------
# Compute host-class facts
# ---------------------------------------------------------------------------
- name: Set dynamic host-class facts  # noqa var-naming[no-role-prefix]
  ansible.builtin.set_fact:
    _dell_count: "{{ _dell_check.stdout | default('0') | int }}"
    _pve_count: "{{ _proxmox_check.stdout | default('0') | int }}"
    _virt_output: "{{ _virt_what.stdout | default('') }}"
    cacheable: true

- name: Record host-class facts for downstream roles  # noqa var-naming[no-role-prefix]
  ansible.builtin.set_fact:
    # Physical hardware (bare-metal Dell server, NOT a VM and NOT Proxmox PVE)
    is_physical_host: >-
      {{
        (_dell_check.stdout | default('0') | int) > 0
        and (_proxmox_check.stdout | default('0') | int) == 0
        and not (_raspi_model.stat.exists)
      }}
    # Proxmox VE hypervisor (bare-metal Dell running PVE)
    is_proxmox_host: >-
      {{
        (_proxmox_check.stdout | default('0') | int) > 0
      }}
    # Raspberry Pi / ARM SBC
    is_raspi: "{{ _raspi_model.stat.exists }}"
    # Virtualization details from virt-what
    virt_type: "{{ _virt_what.stdout | default('') }}"
    is_virt_guest: >-
      {{
        (_virt_what.stdout | default('')) is search('hyperv|kvm')
      }}
    is_kvm_guest: >-
      {{
        (_virt_what.stdout | default('')) is search('kvm')
      }}
    # Distro flags
    is_ubuntu: "{{ ansible_facts.distribution == 'Ubuntu' }}"
    is_kali: "{{ ansible_facts.distribution == 'Kali' }}"
    is_debian: "{{ ansible_facts.distribution == 'Debian' }}"
    is_proxmox_ve: "{{ ansible_facts.distribution == 'Debian' and (_proxmox_check.stdout | default('0') | int) > 0 }}"
    # User existence flags (for SSH + shell config roles)
    localuser_exists: "{{ 'localuser' in getent_passwd }}"
    subodev_exists: "{{ 'subodev' in getent_passwd }}"
    cacheable: true

# ---------------------------------------------------------------------------
# Inventory-group-derived facts
# These let roles skip config for infrastructure servers (NTP, DHCP, DNS)
# based on inventory group membership rather than hostname pattern matching.
# ---------------------------------------------------------------------------
- name: Record inventory-group facts for downstream roles  # noqa var-naming[no-role-prefix]
  ansible.builtin.set_fact:
    is_ntp_server: "{{ 'ntp_servers' in group_names }}"
    is_dhcp_server: "{{ 'dhcp_servers' in group_names }}"
    is_dns_server: "{{ 'dns_servers' in group_names }}"
    is_librenms_server: "{{ 'librenms_server' in group_names }}"
    is_wazuh_server: "{{ 'wazuh_server' in group_names }}"
    is_dev_workstation: "{{ 'dev_workstations' in group_names }}"
    cacheable: true

# ---------------------------------------------------------------------------
# Report
# ---------------------------------------------------------------------------
- name: Report detected host class
  ansible.builtin.debug:
    msg: >-
      host-class: physical={{ is_physical_host }} proxmox={{ is_proxmox_host }}
      raspi={{ is_raspi }} virt='{{ virt_type | default('none') }}'
      ubuntu={{ is_ubuntu }} kali={{ is_kali }}
      ntp_server={{ is_ntp_server }} dhcp_server={{ is_dhcp_server }}
      librenms={{ is_librenms_server }} wazuh={{ is_wazuh_server }}
      dev_ws={{ is_dev_workstation }}