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

  test.services.syncthing = {
    guiAddress = "${config.networking.hostName}.private:8384";
    declarative = {
      overrideDevices = true;
      devices = let
        device = name: id:
        {
          "${name}" = {
            name = name;
            id = id;
            addresses = [ "tcp://${name}.private:22000" "tcp://${name}.private:21027" ];
          };
        };
      in
      (device "workhorse"     "AFSAKB6-JLH4QAS-DSRMPI3-6PVCIHF-IIAVLPC-STPNO3Y-YRDU5NW-QD445QI")
      // (device "pepe"       "SZLXFW3-VTAC7UB-V2Z7CHE-3VZAYPL-6D72AK6-OCDMPZP-G4FPY5P-FL6ZVAG")
      // (device "workout"    "DZOOAKG-GI2SVOS-QEVMFL7-TRHVTPQ-ADIJEVH-RH5WV3J-6M7MJHC-C53EOAC")
      // (device "porani"     "6YOIA4E-X52ZD5Z-FPNWPRS-77QIMMU-VDIXVZB-6BPQN7A-FFJDU4W-EXEGFAI")
      // (device "sterni"     "ZFNNKPD-ZSOAYJQ-VROXXDB-5MD3UTJ-GDCNTSQ-G5POVV3-UZG5HFT-CCAU3AD")
      // {
        smartphone = {
          name = "smartphone";
          id = "P6MFODE-PO7CRVB-5RL5AMX-HG4D2CE-C2NC7M4-RYHGX2N-VUU2DWL-C6GVPQN";
          addresses = [ "dynamic" ];
        };
      }
      // {
        bumba = {
          name = "windows-bumba";
          id = "JS7PWTO-VKFGBUP-GNFLSWP-MGFJ2KH-HLO2LKW-V3RPCR6-PCB5SQC-42FCKQZ";
          addresses = [ "dynamic" ];
        };
      }
      // {
        mors = {
          name = "lassulus-mors";
          id = "ZPRS57K-YK32ROQ-7A6MRAV-VOYXQ3I-CQCXISZ-C5PCV2A-GSFLG3I-K7UGGAH";
          addresses = [ "tcp://mors.r:22000" ];
        };
      };

      folders = {

        # needs to be on encrypted drives
        # -------------------------------
        desktop = {
          watch = false;
          devices = [ "workout" "workhorse" "pepe" "sterni" "porani" ];
        };
        finance = {
          watch = false;
          devices = [ "workout" "workhorse" "pepe" "sterni" "porani" ];
        };

        # no need to be stored on encrypted drives
        # ----------------------------------------
        book = {
          id = "wwbvs-5lfbh";
          watch = false;
          devices = [ "workout" "pepe" "sterni" ];
        };
        lost-fotos = {
          watch = false;
          devices = [ "workout" "workhorse" "pepe" "sterni" "porani" ];
        };
        #desktop-encrypted = {
        #  id = "ebnth-pfven";
        #  watch = false;
        #  devices = [ "workout" "workhorse" "pepe" "sterni" ];
        #};
        #finance-encrypted = {
        #  id = "gl7rx-sdsnx";
        #  watch = false;
        #  devices = [ "workout" "workhorse" "pepe" "sterni" ];
        #};

        movies = {
          id = "vatmy-c2qf4";
          watch = false;
          devices = [ "workhorse" "porani" ];
        };
        porn = {
          id = "vatmy-c2qf4";
          watch = false;
          devices = [ "workhorse" "porani" ];
        };
        music-library = {
          id = "gytmq-r2zrx";
          watch = false;
          devices = [ "porani" "workout" "workhorse" "pepe" "sterni" ];
        };
        music-library-free = {
          id = "mu9mn-zgvsw";
          watch = false;
          devices = [ "workout" "workhorse" "mors" ];
        };
        music-projects = {
          id = "acfhu-r4t4f";
          watch = false;
          devices = [ "workout" "workhorse" "pepe" "sterni" ];
        };
        podcasts = {
          id = "yvzmx-hcomd";
          watch = false;
          devices = [ "workhorse" "porani" ];
        };
        samples = {
          id = "pcgkj-tjucd";
          watch = false;
          devices = [ "workout" "workhorse" "sterni" ];
        };
        series = {
          id = "all-series";
          watch = false;
          devices = [ "workhorse" "porani" ];
        };
        smartphone-music = {
          id = "0vjze-xvs8n";
          watch = false;
          devices = [ "workout" "smartphone" ];
        };
        smartphone-fotos = {
          id = "e5823_jtbr-photos";
          watch = false;
          devices = [ "sterni" "workout" "pepe" "smartphone" ];
        };
        video-material = {
          id = "wgkun-fec5h";
          watch = false;
          devices = [ "workout" "workhorse" ];
        };

        # one on one
        porani-workout = {
          devices = [ "porani" "workout" ];
          watch = false;
        };
        porani-pepe = {
          devices = [ "porani" "pepe" ];
          watch = false;
        };
        windows-sync = {
          id = "hcity-p5ikc";
          watch = false;
          devices = [ "schasch" "bumba" "workout" "kruck" ];
        };
        workout-pepe = {
          devices = [ "pepe" "workout" ];
          watch = false;
        };
      };

    };
  };


  # convenience script to know which folder needs to be configured
  environment.systemPackages =
  let
    folders = config.test.services.syncthing.declarative.folders;
    computers = unique (flatten (mapAttrsToList (_: value: value.devices) folders));
    isComputerInDeviceList = computer: deviceList: (unique deviceList) == (unique (deviceList ++ [ computer ]));
    getFolderNames = computer: naturalSort (builtins.attrNames (filterAttrs (_: folder: isComputerInDeviceList computer folder.devices) folders));
    computerMap = foldl (acumulator: computer: acumulator // { "${computer}" = getFolderNames computer; } ) {} computers;
    printTemplate = folder: ''${folder}.path = "";'';
  in
  mapAttrsToList (computer: folders: pkgs.writeShellScriptBin "syncthing.${computer}" ''
    cat <<EOF
    ${concatStringsSep "\n" (map printTemplate folders)}
    EOF
  '') computerMap;

}