{ lib, config, ... }:
let
  markerType = lib.types.submodule {
    options = {
      location = lib.mkOption {
        type = lib.types.nullOr lib.types.str;
        default = null;
      };
    };
  };
in
{
  options = {
    map.markers = lib.mkOption {
      type = lib.types.listOf markerType;
    };
  };

  config = {
    map = {
      markers = [
        { location = "Switzerland"; }
        { location = "New York"; }
      ];

      center = lib.mkIf
        (lib.length config.map.markers >= 1)
        null;

      zoom = lib.mkIf
        (lib.length config.map.markers >= 2)
        null;
    };

    requestParams =
      let
        paramsForMarkers = builtins.map
          (marker: "$(${config.scripts.geocode}/bin/geocode ${
            lib.escapeShellArg marker.location})")
          config.map.markers;
      in [
        "markers=\"${lib.concatStringsSep "|" paramsForMarkers}\""
      ];
  };
}