{ pkgs }:

pkgs.writeShellScriptBin "caddy-proxy" ''
  set -e

  # Default values
  CERT_DIR="./certs"
  CADDYFILE="./Caddyfile"

  # Parse arguments
  while [[ $# -gt 0 ]]; do
    case $1 in
      --cert-dir)
        CERT_DIR="$2"
        shift 2
        ;;
      --caddyfile)
        CADDYFILE="$2"
        shift 2
        ;;
      --help|-h)
        echo "Usage: $0 [--cert-dir <directory>] [--caddyfile <file>]"
        echo ""
        echo "Options:"
        echo "  --cert-dir <dir>     Directory containing certificates (default: ./certs)"
        echo "  --caddyfile <file>   Path to Caddyfile (default: ./Caddyfile)"
        echo "  --help, -h           Show this help message"
        echo ""
        echo "The certificate directory should contain:"
        echo "  - cert.pem (certificate file)"
        echo "  - key.pem (private key file)"
        echo ""
        echo "Examples:"
        echo "  $0                                        # Use ./certs and ./Caddyfile"
        echo "  $0 --cert-dir ~/my-certs                 # Custom cert directory"
        echo "  $0 --caddyfile ~/my-caddy/Caddyfile      # Custom Caddyfile"
        echo "  $0 --cert-dir ~/certs --caddyfile ./conf/Caddyfile"
        exit 0
        ;;
      *)
        echo "Unknown option: $1"
        exit 1
        ;;
    esac
  done

  # Convert to absolute paths
  CERT_DIR=$(realpath "$CERT_DIR")
  CADDYFILE=$(realpath "$CADDYFILE")

  # Check if Caddyfile exists
  if [ ! -f "$CADDYFILE" ]; then
    echo "ERROR: Caddyfile not found: $CADDYFILE"
    echo "Create a Caddyfile or use: nix run .#generate-caddyfile"
    exit 1
  fi

  # Check if certificate directory exists
  if [ ! -d "$CERT_DIR" ]; then
    echo "ERROR: Certificate directory does not exist: $CERT_DIR"
    echo "Please create the directory and add your certificates."
    exit 1
  fi

  # Check for required certificates
  if [ ! -f "$CERT_DIR/cert.pem" ]; then
    echo "ERROR: Missing cert.pem in $CERT_DIR"
    exit 1
  fi

  if [ ! -f "$CERT_DIR/key.pem" ]; then
    echo "ERROR: Missing key.pem in $CERT_DIR"
    exit 1
  fi

  echo "Starting Caddy..."
  echo "Caddyfile: $CADDYFILE"
  echo "Certificates: $CERT_DIR"
  echo "Press Ctrl+C to stop"
  echo ""

  # Set environment variables that can be used in Caddyfile
  export CERT_DIR
  export CERT_FILE="$CERT_DIR/cert.pem"
  export KEY_FILE="$CERT_DIR/key.pem"

  # Run Caddy with the specified Caddyfile
  ${pkgs.caddy}/bin/caddy run --config "$CADDYFILE"
''