{ pkgs ? import <nixpkgs> {} }:

pkgs.mkShell {
  name = "hex-pigeon-dev";

  buildInputs = with pkgs; [
    # Rust + WASM toolchain
    rustup
    wasm-pack
    binaryen          # wasm-opt

    # Node / frontend
    nodejs_22

    # Utilities
    pkg-config
    openssl
  ];

  shellHook = ''
    export RUSTUP_HOME="$HOME/.rustup"
    export CARGO_HOME="$HOME/.cargo"
    export PATH="$CARGO_HOME/bin:$PATH"

    # Install stable + wasm32 target on first run
    rustup toolchain install stable 2>/dev/null || true
    rustup default stable 2>/dev/null || true
    rustup target add wasm32-unknown-unknown 2>/dev/null || true

    echo "HexPigeon dev shell ready"
    echo "  • Build WASM : cd parser-wasm && wasm-pack build --target web --out-dir ../frontend/src/wasm"
    echo "  • Frontend   : cd frontend && npm install && npm run dev"
  '';
}