# SPDX-License-Identifier: CC0-1.0

{ system, localSystem, crossSystem, genodepkgs, nixpkgs, apps }:

let
  thisSystem = builtins.getAttr system;
  inherit (nixpkgs) buildPackages;
  testPkgs = thisSystem genodepkgs.packages;

in rec {

  linuxScript = name: env: bootDhall:
    buildPackages.runCommand name ({
      inherit name;
      buildInputs = [ buildPackages.dhall ];
      DHALL_GENODE = "${testPkgs.dhallGenode}/binary.dhall";
    } // env) ''
      export XDG_CACHE_HOME=$NIX_BUILD_TOP

      ${buildPackages.xorg.lndir}/bin/lndir -silent \
        ${testPkgs.dhallGenode}/.cache \
        $XDG_CACHE_HOME

      dhall to-directory-tree --output $out \
        <<< "${./linux-script.dhall} (${bootDhall}) \"$out\""
    '';

  compileBoot = name: env: bootDhall:
    buildPackages.runCommand name ({
      inherit name;
      buildInputs = [ buildPackages.dhall ];
      DHALL_GENODE = "${testPkgs.dhallGenode}/binary.dhall";
    } // env) ''
      export XDG_CACHE_HOME=$NIX_BUILD_TOP

      ${buildPackages.xorg.lndir}/bin/lndir -silent \
        ${testPkgs.dhallGenode}/.cache \
        $XDG_CACHE_HOME

      dhall to-directory-tree --output $out \
        <<< "${./compile-boot.dhall} (${bootDhall}) \"$out\""

      substituteInPlace "$out/modules_asm" \
        --replace '.incbin "./config"' ".incbin \"$out/config\""

      ${buildPackages.libxml2}/bin/xmllint \
        -schema ${testPkgs.genodeSources}/repos/os/src/init/config.xsd \
        -noout $out/config
    '';

  novaImage = name: env: boot:
    let inherit (nixpkgs.stdenv) cc;
    in nixpkgs.stdenv.mkDerivation {
      name = name + ".image.elf";
      # buildInputs = with buildPackages; [ stdenv.cc ];
      build = compileBoot name env boot;

      # CC="${cc}/bin/${cc.targetPrefix}cc"

      buildCommand = ''
        # compile the boot modules into one object file
        $CC -c -x assembler -o "boot_modules.o" "$build/modules_asm"

        # link final image
        LD="${buildPackages.binutils}/bin/${buildPackages.binutils.targetPrefix}ld"
        $LD --strip-all -nostdlib \
        	-T${testPkgs.genodeSources}/repos/base/src/ld/genode.ld \
        	-T${testPkgs.genodeSources}/repos/base-nova/src/core/core-bss.ld \
        	-z max-page-size=0x1000 \
        	-Ttext=0x100000 -gc-sections \
        	"${testPkgs.base-nova.coreObj}" boot_modules.o \
        	-o $out
      '';
    };

  mergeManifests = inputs:
    nixpkgs.writeTextFile {
      name = "manifest.dhall";
      text = with builtins;
        let
          f = head: input:
            if hasAttr "manifest" input then
              "${head},${input.pname}=${input.manifest}"
            else
              abort "${input.pname} does not have a manifest";
        in (foldl' f "{" inputs) + "}";
    };

}