{ config, lib, pkgs, ... }:

let
  inherit (lib) mkIf mkMerge mkThenElse;
  cfg = config.r6d.config-generator;
  computers = config.r6d.computers;
  profiles = config.r6d.profiles;
in

mkIf cfg.hydra-core {

  # Paquets
  environment.systemPackages = with pkgs; [
  ];

  # Documentation HYDRA

  ## Installation

  # 1. créer clef SSH :
  #	ssh-keygen -C "hydra@pedro.dubronetwork.fr" -N "" -f /etc/nixos/id_buildfarm
  # 2. récupérer la clef publique du serveur ssh + l'ajouter dans les `knownHosts` :
  #	ssh-keyscan localhost
  # 3. créer un utilisateur pour gérer hydra
  #	su - hydra
  #	hydra-create-user jpierre03 --password xxx --role 'admin'
  # 4. relancer hydra
  # 5. ajouter un vhost à nginx
  # 6. relancer nginx
  # 7. le service accessible à hydra.<nom de machine>

  ## Tutoriel
  # * https://github.com/peti/hydra-tutorial

  # Services

  ## Hydra

  services.hydra = {
    enable = true;
    hydraURL = "http://hydra.${config.networking.hostName}";
    notificationSender = "hydra@${config.networking.hostName}";
    listenHost = "localhost";
    minimumDiskFree = 50; # Go
    smtpHost = "localhost";
  };

  ## Ménage
  #nix.gc.automatic = true;

  ## Délégation des actions de compilation à la compilefarm

  ### Machines connues
  # 2. récupérer la clef publique du serveur ssh : ssh-keyscan localhost + l'ajouter dans les knownHosts
  
  programs.ssh.knownHosts = {
    "monstre.dubronetwork.fr".publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBTTrLhq1Cwm0rpnwEIxSLqVrJWZnt+/9dt+SKd8NiIc";
    "pedro.dubronetwork.fr".publicKey   = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIM7fjo2ysLqlfSo6BKnc6I6m1ayoPrbwEEyTKZmUzsOD";
    "ocean.prunetwork.fr".publicKey     = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAINCaRuTl8iCTUE4XInOpkSlwQj5Re4w4Iq+gNIlJe8pA";
    "radx.prunetwork.fr".publicKey      = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIGyoXdTEnxSgZTMfRfVH+bpOGZJtJpydAijcRGsZik7U";
    "rollo.dubronetwork.fr".publicKey   = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAID4lWgS/sVdcZvnAAN+lBSOcCL9ISdAUsjp1kh9lalNu";
  };

  # une fois installé :
  # 1. créer chef SSH : ssh-keygen -C "hydra@pedro.dubronetwork.fr" -N "" -f /etc/nixos/id_buildfarm
  # ssh-keygen -t ed25519 -C "hydra MACHINE" -f /etc/nixos/hydra-ssh-key
  # accessible à hydra.pedro.dubnronetwork.fr
  
  nix = {
    distributedBuilds = false;
    buildMachines = [
    #      { hostName = "pedro.dubronetwork.fr"; maxJobs = 5; speedFactor = 10; sshKey = "/etc/nixos/id_buildfarm"; sshUser = "root"; system = "x86_64-linux"; }
    ];
    extraOptions = "auto-optimise-store = true";
  };
}