{ pkgs, ... }:

{
  # La doc ceph : https://docs.ceph.com/en/quincy/install/manual-deployment/

  services.ceph = {
    enable = true;

    # osd, 1 deamon/disk avec un id unique dans le cluster.
    osd = {
      enable = true;

      # je propose comme convention, entier suivi de l'id à 2 chiffre de la machine
      # les machines physique ont des id < 100, donc ca fonctionne
      daemons = ["0" "1" "2" "3" "4" "5" "6" "7" "8" "9" "10" "11"];
      extraConfig = {
        "public_addr" = "172.16.4.3";
        "cluster_addr" = "172.16.6.3";
      };
    };

    # monitor, garde la map du cluster
    mon = {
      enable = true;
      extraConfig = {
        "mon host" = "172.16.4.3";
        "mon initial members" = "cephiroth";
      };
      daemons = ["cephiroth"];
    };

    # Dashboard
    mgr = {
      enable = true;
      daemons = ["cephiroth"];
      extraConfig = {
        "mgr_initial_modules" = "dashboard prometheus";
        # TODO: setup prometheus listen addr
        # le port de prometheus est 9283 pour ceph
      };
    };

    # pour cephFS
    mds = {
      enable = true;
      daemons = ["cephiroth"];
    };

    global = {
      # Comme nom de cluster on choisit `ceph` (la valeur par défaut),
      # car on aura qu'un cluster.
      clusterName = "ceph";
      # fsid unique par node, généré avec `uuidgen`
      fsid = "af0a334a-3356-4fb6-800c-95b4a99232c0";
      monHost = "172.16.4.3";
      monInitialMembers = "cephiroth";
      publicNetwork = "172.16.4.0/24";
      clusterNetwork = "172.16.6.0/24";
    };

    client = {
      enable = true;
    };
  };

  # automaticaly start osd when we restart the server
  systemd.services.ceph-mesh = {
    enable = true;
    description = "Ceph OSD Bindings";
    unitConfig = {
      After = "local-fs.target";
      Wants = "local-fs.target";
    };
    serviceConfig = {
      Type = "oneshot";
      KillMode = "none";
      Environment = "CEPH_VOLUME_TIMEOUT=10000 PATH=$PATH:/run/current-system/sw/bin/";
      ExecStart = "/bin/sh -c 'timeout $CEPH_VOLUME_TIMEOUT /run/current-system/sw/bin/ceph-volume lvm activate --all --no-systemd'";
      TimeoutSec = 0;
    };
    wantedBy = ["multi-user.target"];
  };

  environment.systemPackages = [ pkgs.ceph pkgs.smartmontools ];
}