---
# Common baseline for all Linux hosts.
# Installs core packages, configures SSH, sets up the shell environment.

- name: Update apt cache
  ansible.builtin.apt:
    update_cache: true
    cache_valid_time: 3600
  when: ansible_facts["os_family"] == "Debian"

- name: Install baseline packages (Debian)
  ansible.builtin.apt:
    name:
      - curl
      - wget
      - git
      - htop
      - tmux
      - vim
      - jq
      - unzip
      - fish
      - rsync
      - fail2ban
      - ufw
    state: present
  when: ansible_facts["os_family"] == "Debian"

- name: Install baseline packages (Alpine)
  community.general.apk:
    name:
      - curl
      - wget
      - git
      - htop
      - tmux
      - vim
      - jq
      - fish
      - rsync
      - shadow
      - py3-requests
    state: present
  when: ansible_facts["os_family"] == "Alpine"

- name: Install baseline packages (FreeBSD)
  community.general.pkgng:
    name:
      - curl
      - wget
      - git
      - htop
      - tmux
      - vim
      - jq
      - rsync
    state: present
  when: ansible_facts["os_family"] == "FreeBSD"

- name: Install fish shell
  ansible.builtin.package:
    name: fish
    state: present
  when: inventory_hostname != 'london-a'

- name: Get fish shell path
  ansible.builtin.command: which fish
  changed_when: false
  register: common_fish_path
  when: inventory_hostname != 'london-a'

- name: Set fish as default shell
  ansible.builtin.user:
    name: root
    shell: "{{ common_fish_path.stdout }}"
  when: inventory_hostname != 'london-a'

- name: Ensure SSH directory exists
  ansible.builtin.file:
    path: /root/.ssh
    state: directory
    mode: '0700'

- name: Harden SSH config
  ansible.builtin.lineinfile:
    path: /etc/ssh/sshd_config
    regexp: "{{ item.regexp }}"
    line: "{{ item.line }}"
    state: present
  loop:
    - {regexp: '^#?PermitRootLogin', line: 'PermitRootLogin prohibit-password'}
    - {regexp: '^#?PasswordAuthentication', line: 'PasswordAuthentication no'}
    - {regexp: '^#?X11Forwarding', line: 'X11Forwarding no'}
  notify: Restart sshd
  when: ansible_facts["os_family"] != "FreeBSD"

- name: Enable fail2ban (Debian)
  ansible.builtin.service:
    name: fail2ban
    state: started
    enabled: true
  when: ansible_facts["os_family"] == "Debian"

# --- UFW firewall (Debian only) ---

- name: Set UFW default deny incoming
  community.general.ufw:
    direction: incoming
    default: deny
  when:
    - ansible_facts["os_family"] == "Debian"
    - common_ufw_enabled | bool
  notify: Reload ufw

- name: Set UFW default allow outgoing
  community.general.ufw:
    direction: outgoing
    default: allow
  when:
    - ansible_facts["os_family"] == "Debian"
    - common_ufw_enabled | bool
  notify: Reload ufw

- name: Allow all traffic on Tailscale interface
  community.general.ufw:
    rule: allow
    direction: in
    interface: tailscale0
    comment: "Tailscale mesh - allow all"
  when:
    - ansible_facts["os_family"] == "Debian"
    - common_ufw_enabled | bool
  notify: Reload ufw

- name: Allow SSH (safety net)
  community.general.ufw:
    rule: allow
    port: '22'
    proto: tcp
    comment: "SSH"
  when:
    - ansible_facts["os_family"] == "Debian"
    - common_ufw_enabled | bool
  notify: Reload ufw

- name: Allow host-specific ports
  community.general.ufw:
    rule: allow
    port: "{{ item.port | string }}"
    proto: "{{ item.proto | default('tcp') }}"
    comment: "{{ item.comment | default(omit) }}"
  loop: "{{ common_ufw_allowed_ports }}"
  when:
    - ansible_facts["os_family"] == "Debian"
    - common_ufw_enabled | bool
    - common_ufw_allowed_ports | length > 0
  notify: Reload ufw

- name: Enable UFW
  community.general.ufw:
    state: enabled
  when:
    - ansible_facts["os_family"] == "Debian"
    - common_ufw_enabled | bool