{
  description = "Cuatro - 3D Printable Game Pieces";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
      in
      {
        devShells.default = pkgs.mkShell {
          buildInputs = with pkgs; [
            openscad
            # For viewing and editing STL files
            meshlab
            # For version control
            git
          ];

          shellHook = ''
            echo "Cuatro Development Environment"
            echo "Available tools:"
            echo "  openscad - OpenSCAD for 3D modeling"
            echo "  meshlab  - 3D mesh viewer/editor"
            echo ""
            echo "To generate STL files:"
            echo "  openscad -o output.stl parts.scad"
            echo ""
            echo "To open the design in OpenSCAD GUI:"
            echo "  openscad parts.scad"
          '';
        };

        packages.default = pkgs.stdenv.mkDerivation {
          pname = "cuatro";
          version = "1.0.0";
          
          src = ./.;
          
          buildInputs = [ pkgs.openscad ];
          
          buildPhase = ''
            # Generate STL files for all piece types
            mkdir -p $out/stl
            
            # Create individual STL files for each piece type
            openscad -D 'tube_holes(row=1, fn=360);' -o $out/stl/tube-holes.stl parts.scad
            openscad -D 'tubes(row=1);' -o $out/stl/tubes.stl parts.scad  
            openscad -D 'boxes(row=1);' -o $out/stl/boxes.stl parts.scad
            openscad -D 'box_holes(row=1);' -o $out/stl/box-holes.stl parts.scad
            
            # Create combined file
            openscad -o $out/stl/all-pieces.stl parts.scad
          '';
          
          installPhase = ''
            mkdir -p $out/share/cuatro
            cp -r . $out/share/cuatro/
            
            # Create a script for easy STL generation
            mkdir -p $out/bin
            cat > $out/bin/cuatro-generate << 'EOF'
#!/bin/sh
OUTPUT_DIR="''${1:-./stl}"
mkdir -p "$OUTPUT_DIR"

echo "Generating Cuatro STL files to $OUTPUT_DIR"

openscad -D 'tube_holes(row=1, fn=360);' -o "$OUTPUT_DIR/tube-holes.stl" ${placeholder "out"}/share/cuatro/parts.scad
openscad -D 'tubes(row=1);' -o "$OUTPUT_DIR/tubes.stl" ${placeholder "out"}/share/cuatro/parts.scad
openscad -D 'boxes(row=1);' -o "$OUTPUT_DIR/boxes.stl" ${placeholder "out"}/share/cuatro/parts.scad  
openscad -D 'box_holes(row=1);' -o "$OUTPUT_DIR/box-holes.stl" ${placeholder "out"}/share/cuatro/parts.scad
openscad -o "$OUTPUT_DIR/all-pieces.stl" ${placeholder "out"}/share/cuatro/parts.scad

echo "STL files generated successfully!"
EOF
            chmod +x $out/bin/cuatro-generate
          '';
        };

        checks = {
          openscad-syntax = pkgs.runCommand "cuatro-syntax-check" {
            buildInputs = [ pkgs.openscad ];
          } ''
            # Check OpenSCAD syntax
            openscad --check ${self}/parts.scad
            touch $out
          '';
          
          stl-generation = pkgs.runCommand "cuatro-stl-test" {
            buildInputs = [ pkgs.openscad ];
          } ''
            mkdir -p test-output
            
            # Test STL generation
            openscad -o test-output/test.stl ${self}/parts.scad
            
            # Verify STL file was created and is not empty
            if [ ! -s test-output/test.stl ]; then
              echo "Error: STL file was not generated or is empty"
              exit 1
            fi
            
            echo "STL generation test passed"
            touch $out
          '';
        };
      });
}