- name: Prerequisiti Longhorn sui worker #Longhorn espone i volumi ai pod via iSCSI (e RWX via NFS), quindi servono questi pacchetti sui nodi dove girano i pod
  hosts: workers
  become: true
  tags: [prereq]
  tasks:
    - name: Pacchetti iSCSI e NFS
      ansible.builtin.apt:
        name: [open-iscsi, nfs-common]
        state: present
        update_cache: true

    - name: Modulo kernel iscsi_tcp al boot
      ansible.builtin.copy:
        dest: /etc/modules-load.d/longhorn.conf
        content: "iscsi_tcp\n"

    - name: Carica il modulo ora
      ansible.builtin.command: modprobe iscsi_tcp
      changed_when: false

    - name: Abilita e avvia iscsid
      ansible.builtin.systemd:
        name: iscsid
        enabled: true
        state: started

- name: Installa Longhorn #solo su cp1: e' kubectl che parla con il cluster, i manager Longhorn partono da soli sui worker (i control plane hanno il taint NoSchedule)
  hosts: cp1
  become: true
  tags: [install]
  environment:
    KUBECONFIG: /etc/kubernetes/admin.conf
  tasks:
    - name: Scarica il manifest ufficiale
      ansible.builtin.get_url:
        url: "https://raw.githubusercontent.com/longhorn/longhorn/{{ longhorn_version }}/deploy/longhorn.yaml"
        dest: /root/longhorn.yaml
        mode: "0644"

    - name: Numero repliche della StorageClass #il manifest usa 3 repliche: con meno di 3 worker i volumi resterebbero "degraded". Cambia longhorn_replicas in group_vars quando aggiungi worker
      ansible.builtin.replace:
        path: /root/longhorn.yaml
        regexp: 'numberOfReplicas: "\d+"'
        replace: 'numberOfReplicas: "{{ longhorn_replicas }}"'

    - name: Applica Longhorn
      ansible.builtin.command: kubectl apply -f /root/longhorn.yaml
      changed_when: false #apply e' idempotente

    - name: Attendi i manager Longhorn (uno per worker)
      ansible.builtin.command: kubectl -n longhorn-system rollout status ds/longhorn-manager --timeout=600s
      changed_when: false

    - name: Attendi il driver CSI
      ansible.builtin.command: kubectl -n longhorn-system rollout status deploy/longhorn-driver-deployer --timeout=600s
      changed_when: false

    - name: Attendi che tutti i pod Longhorn siano Ready #il driver CSI crea altri pod dopo, quindi riproviamo finche' non sono tutti Ready
      ansible.builtin.command: kubectl -n longhorn-system wait --for=condition=Ready pod --all --timeout=60s
      register: lh_ready
      until: lh_ready.rc == 0
      retries: 10
      delay: 10
      changed_when: false

    - name: Verifica StorageClass longhorn
      ansible.builtin.command: kubectl get storageclass longhorn
      changed_when: false