{pkgs, config, ...}:

###### interface
let
  inherit (pkgs.lib) mkOption mkIf;

  options = {
    services = {
      openfire = {
        enable = mkOption {
          default = false;
          description = "
            Whether to enable OpenFire XMPP server.
          ";
        };
        usePostgreSQL = mkOption {
          default = true;
          description = "
            Whether you use PostgreSQL service for your storage back-end.
          ";
        };
      };
    };
  };
in

###### implementation

let
  inherit (pkgs) jre openfire coreutils which gnugrep gawk gnused;
    
  startDependency = if config.services.openfire.usePostgreSQL then 
    "postgresql"
  else
    if config.services.gw6c.enable then 
      "gw6c" 
    else 
      "network-interfaces";
in

mkIf config.services.openfire.enable {

  assertions = [ {
    assertion = !(config.services.openfire.usePostgreSQL -> config.services.postgresql.enable);
    message = "openfire assertion failed";
  } ];

  require = [
    options
  ];


  services = {
      extraJobs = [{
        name = "openfire";
        job = ''
          description "OpenFire XMPP server"

          start on ${startDependency}/started
          stop on shutdown

          script 
            export PATH=${jre}/bin:${openfire}/bin:${coreutils}/bin:${which}/bin:${gnugrep}/bin:${gawk}/bin:${gnused}/bin
            export HOME=/tmp
            mkdir /var/log/openfire || true 
            mkdir /etc/openfire || true 
            for i in ${openfire}/conf.inst/*; do
                if ! test -f /etc/openfire/$(basename $i); then
                    cp $i /etc/openfire/
                fi
            done
            openfire start
          end script
        '';
    }];
  };
}