{ lib, pkgs, config, name, ... }:
{
  options.myServices.certificates = {
    enable = lib.mkEnableOption "enable certificates";
    certConfig = lib.mkOption {
      default = {
        webroot = "/var/lib/acme/acme-challenge";
        email = "ismael@bouya.org";
        postRun = builtins.concatStringsSep "\n" [
          (lib.optionalString config.services.httpd.Prod.enable "systemctl reload httpdProd.service")
          (lib.optionalString config.services.httpd.Tools.enable "systemctl reload httpdTools.service")
          (lib.optionalString config.services.httpd.Inte.enable "systemctl reload httpdInte.service")
          (lib.optionalString config.services.nginx.enable "systemctl reload nginx.service")
        ];
      };
      description = "Default configuration for certificates";
    };
  };

  config = lib.mkIf config.myServices.certificates.enable {
    services.duplyBackup.profiles.system.excludeFile = ''
      + /var/lib/acme/acme-challenge
      '';
    services.nginx = {
      recommendedTlsSettings = true;
      virtualHosts = { "${config.hostEnv.fqdn}" = { useACMEHost = name; forceSSL = true; }; };
    };
    services.websites.certs = config.myServices.certificates.certConfig;
    myServices.databasesCerts = config.myServices.certificates.certConfig;
    myServices.ircCerts = config.myServices.certificates.certConfig;

    security.acme.acceptTerms = true;
    security.acme.preliminarySelfsigned = true;

    security.acme.certs = {
      "${name}" = config.myServices.certificates.certConfig // {
        domain = config.hostEnv.fqdn;
      };
    };

    systemd.services = lib.attrsets.mapAttrs' (k: v:
      lib.attrsets.nameValuePair "acme-selfsigned-${k}" { script = lib.mkBefore ''
        cp $workdir/server.crt ${config.security.acme.certs."${k}".directory}/cert.pem
        chown '${v.user}:${v.group}' ${config.security.acme.certs."${k}".directory}/cert.pem
        chmod ${if v.allowKeysForGroup then "750" else "700"} ${config.security.acme.certs."${k}".directory}/cert.pem

        cp $workdir/ca.crt ${config.security.acme.certs."${k}".directory}/chain.pem
        chown '${v.user}:${v.group}' ${config.security.acme.certs."${k}".directory}/chain.pem
        chmod ${if v.allowKeysForGroup then "750" else "700"} ${config.security.acme.certs."${k}".directory}/chain.pem
        '';
      }
    ) config.security.acme.certs //
    lib.attrsets.mapAttrs' (k: data:
      lib.attrsets.nameValuePair "acme-${k}" {
        serviceConfig.ExecStartPre =
          let
            script = pkgs.writeScript "acme-pre-start" ''
              #!${pkgs.runtimeShell} -e
              mkdir -p '${data.webroot}/.well-known/acme-challenge'
              chmod a+w '${data.webroot}/.well-known/acme-challenge'
              #doesn't work for multiple concurrent runs
              #chown -R '${data.user}:${data.group}' '${data.webroot}/.well-known/acme-challenge'
            '';
          in
            "+${script}";
      }
    ) config.security.acme.certs //
    {
      httpdProd = lib.mkIf config.services.httpd.Prod.enable
        { after = [ "acme-selfsigned-certificates.target" ]; wants = [ "acme-selfsigned-certificates.target" ]; };
      httpdTools = lib.mkIf config.services.httpd.Tools.enable
        { after = [ "acme-selfsigned-certificates.target" ]; wants = [ "acme-selfsigned-certificates.target" ]; };
      httpdInte = lib.mkIf config.services.httpd.Inte.enable
        { after = [ "acme-selfsigned-certificates.target" ]; wants = [ "acme-selfsigned-certificates.target" ]; };
    };
  };
}