#!/usr/bin/env bash
(return 0 2>/dev/null) && { echo 'Do not source'; return 2; }

trap 'q' INT TERM

q() {
  echo "bye"
  exit 0
}

# Check required commands
for cmd in printf read seq; do
  command -v "$cmd" >/dev/null || { echo "missing: $cmd"; exit 2; }
done

# Function to print a horizontal line of given length
L() {
  printf -- '-%.0s' $(seq 1 "$1")
}

# ASCII art of a llama (renown source: https://emojicombos.com/llama-ascii-art)
llama_art() {
  cat <<'EOF'
       __
      /  \__
     (     @\___
     /         O
    /   (_____/
   /_____/   U
EOF
}

# Print a simple menu with borders
print_menu() {
  local width=40
  L "$width"
  printf "\n"
  printf "| %-36s |\n" "Llama ASCII Art Viewer"
  L "$width"
  printf "\n"
  printf "| %-36s |\n" "Commands:"
  printf "| %-36s |\n" "  a - show ASCII art"
  printf "| %-36s |\n" "  q - quit"
  L "$width"
  printf "\n"
}

while :; do
  print_menu
  read -r -p '> ' x
  case "$x" in
    [aA])
      llama_art
      ;;
    [qQ])
      q
      ;;
    *)
      echo "Unknown command: '$x'. Use 'a' to show llama, 'q' to quit."
      ;;
  esac
done