labs/tidepool/src/packages/default.nix

{
  lib,
  lib',
  config,
}: let
  doubles = lib'.systems.doubles.all;

  packages = builtins.removeAttrs config.packages ["cross"];
in {
  includes = [
    ./foundation
  ];

  options = {
    packages = lib.options.create {
      description = "The package set.";
      type = lib.types.submodule {
        freeform = lib.types.attrs.of (lib.types.submodule {
          freeform = lib'.types.alias;
        });

        options.cross = lib.attrs.generate doubles (system:
          lib.options.create {
            description = "The cross-compiled package set for the ${system} target.";
            type = lib'.types.packages;
            default = {};
          });
      };
    };

    preferences.packages = {
      version = lib.options.create {
        description = "The preferred package version when using aliases.";
        type = lib.types.enum ["latest" "stable"];
        default.value = "latest";
      };
    };
  };

  config.packages.cross = lib.attrs.generate doubles (
    system:
      builtins.mapAttrs
      (
        namespace:
          builtins.mapAttrs
          (name: alias: let
            setHost = package:
              if package != {}
              then
                (package.extend ({config}: {
                  config = {
                    platform = {
                      host = lib.modules.overrides.force system;
                      target = lib.modules.overrides.default system;
                    };

                    deps = {
                      build = {
                        only = setHost package.deps.build.only;
                        build = setHost package.deps.build.build;
                        host = setHost package.deps.build.host;
                        target = setHost package.deps.build.target;
                      };
                      host = {
                        only = setHost package.deps.host.only;
                        host = setHost package.deps.host.host;
                        target = setHost package.deps.host.target;
                      };
                      target = {
                        only = setHost package.deps.target.only;
                        target = setHost package.deps.target.target;
                      };
                    };
                  };
                }))
                .config
              else package;

            updated =
              alias
              // {
                versions =
                  builtins.mapAttrs
                  (version: package: setHost package)
                  alias.versions;
              };
          in
            updated)
      )
      packages
  );
}