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

with lib;
let
  cfg = config.modules.services.ldap;
in
{
  options.modules.services.ldap = {
    enable = mkEnableOption "OpenLDAP server";
    package = mkOption { type = types.package; default = pkgs.openldap; };
    dc = mkOption { type = types.str; };
    tld = mkOption { type = types.str; };
    tls.acmeHost = mkOption { type = types.str; default = "${cfg.dc}.${cfg.tld}"; };
    secrets.rootPass = mkOption { type = types.path; description = "path to the root password file"; };
  };

  config = mkIf cfg.enable {
    services.openldap = {
      enable = true;

      urlList = [ "ldap:///" "ldaps:///" ];

      settings = {
        attrs = {
          olcLogLevel = "conns config";

          olcTLSCACertificateFile = "${config.security.acme.certs.${cfg.tls.acmeHost}.directory}/full.pem";
          olcTLSCertificateFile = "${config.security.acme.certs.${cfg.tls.acmeHost}.directory}/cert.pem";
          olcTLSCertificateKeyFile = "${config.security.acme.certs.${cfg.tls.acmeHost}.directory}/key.pem";
          olcTLSCipherSuite = "HIGH:MEDIUM:+3DES:+RC4:+aNULL";
          olcTLSCRLCheck = "none";
          olcTLSVerifyClient = "never";
          olcTLSProtocolMin = "3.1";
        };

        children = {
          "cn=schema".includes = [
            "${cfg.package}/etc/schema/core.ldif"
            "${cfg.package}/etc/schema/cosine.ldif"
            "${cfg.package}/etc/schema/inetorgperson.ldif"
          ];

          "olcDatabase={1}mdb".attrs = {
            objectClass = [ "olcDatabaseConfig" "olcMdbConfig" ];

            olcDatabase = "{1}mdb";
            olcDbDirectory = "/var/lib/openldap/data";

            olcSuffix = "dc=${cfg.dc},dc=${cfg.tld}";

            olcRootDN = "cn=admin,dc=${cfg.dc},dc=${cfg.tld}";
            olcRootPW.path = cfg.secrets.rootPass;

            olcAccess = [
              # ''{0}to <changeme>
              # by <changeme>''

              ''{0}to *
                  by * none'' # Should be changed to {1}
            ];
          };
        };
      };
    };

    systemd.services.openldap = {
      after = [ "acme-finished-${cfg.tls.acmeHost}.target" ];
    };

    users.groups.acme.members = [ "openldap" ];

    modules.persistence.directories = [
      "/var/lib/openldap"
    ];
  };
}