{
  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.11";
  inputs.kicad_bom_generator = {
    url = "git+https://git.m-labs.hk/M-Labs/KiCAD_BOM_Generator.git";
    flake = false;
  };

  outputs = { self, nixpkgs, kicad_bom_generator }:
    let
      pkgs = import nixpkgs { system = "x86_64-linux"; };

      build_copper_plate = { }:
        let
          copper_plate = pkgs.stdenv.mkDerivation {
            name = "production-files";
            src = ./kirdy_LD_adapter_copper_plate;

            nativeBuildInputs = [ pkgs.kicad ];

            PCB = "kirdy_LD_adapter_copper_plate.kicad_pcb";

            buildPhase = ''
              # kicad-cli requires the use of $HOME
              export HOME=$(mktemp -d tmp.XXXX)

              # Get Revision Number from the Title Block in KiCAD PCB
              REV=$(cat $PCB | grep rev | cut -d'"' -f 2)
              PREFIX=kirdy_LD_adapter_copper_plate_$REV

              export KICAD7_3DMODEL_DIR=${pkgs.kicad.libraries.packages3d}/share/kicad/3dmodels
              kicad-cli pcb export step $PCB --subst-models --force -o $PREFIX.step
            '';

            installPhase = ''
              mkdir -p $out 

              cp $PREFIX.step $out/$PREFIX.step
            '';

          };
        in rec { "LD_adapter_copper_plate_step" = copper_plate; };

      build_PCB = { variant }:
        let
          bom = pkgs.stdenv.mkDerivation {
            name = "bom";
            src = ./kirdy_LD_adapter_${variant};

            nativeBuildInputs = [ pkgs.kicad pkgs.python3 ];

            SCH = "kirdy_LD_adapter_${variant}.kicad_sch";
            PCB = "kirdy_LD_adapter_${variant}.kicad_pcb";

            buildPhase = ''
              # kicad-cli requires the use of $HOME
              export HOME=$(mktemp -d tmp.XXXX)

              # Get Revision Number from the Title Block in KiCAD PCB
              REV=$(cat $SCH | grep rev | cut -d'"' -f 2)
              PREFIX=kirdy_LD_adapter_${variant}_$REV

              kicad-cli sch export python-bom $SCH -o $PREFIX"_bom".xml
              export PYTHONPATH=${pkgs.kicad.base}/share/kicad/plugins
              python ${kicad_bom_generator}/generate_bom_from_xml.py $PREFIX"_bom".xml $PREFIX"_bom".csv
            '';

            installPhase = ''
              mkdir -p $out 
              cp $PREFIX"_bom".csv $out/$PREFIX"_bom".csv
            '';
          };

          step = pkgs.stdenv.mkDerivation {
            name = "step";
            src = ./kirdy_LD_adapter_${variant};

            nativeBuildInputs = [ pkgs.kicad pkgs.python3 ];

            SCH = "kirdy_LD_adapter_${variant}.kicad_sch";
            PCB = "kirdy_LD_adapter_${variant}.kicad_pcb";

            buildPhase = ''
              # kicad-cli requires the use of $HOME
              export HOME=$(mktemp -d tmp.XXXX)

              # Get Revision Number from the Title Block in KiCAD PCB
              REV=$(cat $SCH | grep rev | cut -d'"' -f 2)
              PREFIX=kirdy_LD_adapter_${variant}_$REV

              export KICAD7_3DMODEL_DIR=${pkgs.kicad.libraries.packages3d}/share/kicad/3dmodels
              kicad-cli pcb export step $PCB --subst-models --force -o $PREFIX.step
            '';

            installPhase = ''
              mkdir -p $out 
              cp $PREFIX.step $out/$PREFIX.step
            '';
          };

          pos = pkgs.stdenv.mkDerivation {
            name = "pos";
            src = ./kirdy_LD_adapter_${variant};

            nativeBuildInputs = [ pkgs.kicad ];

            SCH = "kirdy_LD_adapter_${variant}.kicad_sch";
            PCB = "kirdy_LD_adapter_${variant}.kicad_pcb";

            buildPhase = ''
              # kicad-cli requires the use of $HOME
              export HOME=$(mktemp -d tmp.XXXX)

              # Get Revision Number from the Title Block in KiCAD PCB
              REV=$(cat $SCH | grep rev | cut -d'"' -f 2)
              PREFIX=kirdy_LD_adapter_${variant}_$REV

              kicad-cli pcb export pos $PCB --format csv --units mm  -o $PREFIX"_pos".csv
            '';

            installPhase = ''
              mkdir -p $out 
              cp $PREFIX"_pos".csv $out/$PREFIX"_pos.csv"
            '';
          };

          gerber_and_drill = pkgs.stdenv.mkDerivation {
            name = "gerber_and_drill";
            src = ./kirdy_LD_adapter_${variant};

            nativeBuildInputs = [ pkgs.kicad pkgs.zip ];

            SCH = "kirdy_LD_adapter_${variant}.kicad_sch";
            PCB = "kirdy_LD_adapter_${variant}.kicad_pcb";

            buildPhase = ''
              # kicad-cli requires the use of $HOME
              export HOME=$(mktemp -d tmp.XXXX)

              # Get Revision Number from the Title Block in KiCAD Top Schematics
              REV=$(cat $SCH | grep rev | cut -d'"' -f 2)
              PREFIX=kirdy_LD_adapter_${variant}_$REV

              mkdir -p $PREFIX"_gerber"
              kicad-cli pcb export gerbers $PCB -l 'F.Cu,B.Cu,F.Paste,B.Paste,F.Silkscreen,B.Silkscreen,F.Mask,B.Mask,Edge.Cuts' --no-x2 --subtract-soldermask -o ./$PREFIX"_gerber"

              mkdir -p $PREFIX"_drill"
              # The additional trailing slash is due to a bug in the kicad-cli tool. https://gitlab.com/kicad/code/kicad/-/issues/14438
              kicad-cli pcb export drill $PCB -u mm --generate-map --map-format gerberx2 -o ./$PREFIX"_drill"/
            '';

            installPhase = ''
              mkdir -p $out 
              cp -r $PREFIX"_gerber" $out/
              cp -r $PREFIX"_drill" $out/
            '';
          };

          pdf = pkgs.stdenv.mkDerivation {
            name = "pdf";
            src = ./kirdy_LD_adapter_${variant};

            nativeBuildInputs = [ pkgs.kicad ];

            SCH = "kirdy_LD_adapter_${variant}.kicad_sch";

            buildPhase = ''
              # kicad-cli requires the use of $HOME
              export HOME=$(mktemp -d tmp.XXXX)

              # Get Revision Number from the Title Block in KiCAD Top Schematics
              REV=$(cat $SCH | grep rev | cut -d'"' -f 2)
              PREFIX=kirdy_LD_adapter_${variant}_$REV

              kicad-cli sch export pdf $SCH -o $PREFIX.pdf
            '';

            installPhase = ''
              mkdir -p $out 
              cp $PREFIX.pdf $out/$PREFIX.pdf
            '';
          };

          all_prod_files =
            pkgs.runCommand "LD_adapter_${variant}_all_prod_files" {
              buildInputs = [ ];
            } ''
              mkdir -p $out
              ln -s ${pdf}/$(ls ${pdf} | grep "pdf") $out
              ln -s ${bom}/$(ls ${bom} | grep ".csv") $out
              ln -s ${pos}/$(ls ${pos} | grep ".csv") $out
              ln -s ${step}/$(ls ${step} | grep ".step") $out
              ln -s ${gerber_and_drill}/$(ls ${gerber_and_drill} | grep "gerber") $out
              ln -s ${gerber_and_drill}/$(ls ${gerber_and_drill} | grep "drill") $out
            '';

        in {
          "LD_adapter_${variant}_step" = step;
          "LD_adapter_${variant}_gerber_and_drill" = gerber_and_drill;
          "LD_adapter_${variant}_bom" = bom;
          "LD_adapter_${variant}_pos" = pos;
          "LD_adapter_${variant}_pdf" = pdf;
          "LD_adapter_${variant}_all_prod_files" = all_prod_files;
        };

    in rec {
      formatter.x86_64-linux = nixpkgs.legacyPackages.x86_64-linux.nixfmt;

      packages.x86_64-linux = (build_PCB { variant = "type_1"; })
        // (build_PCB { variant = "type_2"; }) 
        // (build_copper_plate { });

      devShells.x86_64-linux.default =
        let pkgs = nixpkgs.legacyPackages.x86_64-linux;
        in pkgs.mkShell {
          name = "kicad-dev-shell";
          buildInputs = [ pkgs.kicad ];
        };
    };
}