{ pkgs, system }:

let
  target =
    let
      arch = builtins.head (builtins.split "-" system);
      os = builtins.elemAt (builtins.split "-" system) 1;
      vendor = if os == "darwin" then "apple" else "unknown";
      sys = if os == "darwin" then "darwin" else "linux-gnu";
    in "${arch}-${vendor}-${sys}";

  # currently unused, needed for deno compile
  denort = pkgs.fetchzip {
    url = "https://dl.deno.land/release/v${pkgs.deno.version}/denort-${target}.zip";
    hash = "sha256-ukIk8K2CE+N+3eFs++RPiGZlhhRRVk1gjhdt77/s+4o=";
  };
  
  scrollsDir = ./deno;
  lib = pkgs.lib;
  packageDirs = builtins.attrNames (builtins.readDir scrollsDir);
  
  # Separate FOD for cache only
  unifiedCache = pkgs.stdenv.mkDerivation {
    name = "deno-scrolls-cache";
    src = scrollsDir;
    
    nativeBuildInputs = [ pkgs.deno pkgs.jq ];
    dontPatchShebangs = true;

    buildPhase = ''
      export DENO_DIR=$out
      
      ${lib.concatStringsSep "\n" (map (pkg: 
        let config = import (scrollsDir + "/${pkg}/scroll.nix");
        in ''
          echo "Caching ${pkg}..."
          cd ${pkg}
          ${config.cache-command}
          cd ..
        ''
      ) packageDirs)}

      echo 'Go fuck yourself, SQLite!'
      find $out -name "*-wal" -delete
      find $out -name "*-shm" -delete

      echo 'Go fuck yourself, JSON!'
      find $out/npm -name "*.json" -type f 2>/dev/null | while read -r file; do
        if ${pkgs.jq}/bin/jq empty "$file" 2>/dev/null; then
          ${pkgs.jq}/bin/jq -S . "$file" > "$file.tmp" && mv "$file.tmp" "$file"
        fi
      done
    '';
    
    installPhase = "true";
    
    outputHashMode = "recursive";
    outputHashAlgo = "sha256";
    outputHash = "sha256-maP/JMY6n95A9FQx72YFwRtnprGXc97v1ZdPgt2GB8s=";
  };
  
in
unifiedCache