bash script to choose an option with dialog box

dialog.sh

#!/bin/bash

HEIGHT=10
WIDTH=40
CHOICE_HEIGHT=4
BACKTITLE="Cluster Options"
TITLE="Select Cluster"
MENU="Choose one of the following options:"

ENV="${ENV:-dev}"

if [ $ENV == "dev" ]; then
    OPTIONS=(1 "Dev Option 1"
             2 "Dev Option 2"
             3 "Dev Option 3")
elif [ $ENV == "mode" ]; then
    OPTIONS=(1 "MODE Option 1"
             2 "MODE Option 2")
elif [ $ENV == "prod" ]; then
    OPTIONS=(1 "PROD Option 1"
             2 "PROD Option 2")
    fi
CHOICE=$(dialog --clear \
                --backtitle "$BACKTITLE" \
                --title "$TITLE" \
                --menu "$MENU" \
                $HEIGHT $WIDTH $CHOICE_HEIGHT \
                "${OPTIONS[@]}" \
                2>&1 >/dev/tty)

clear
case $CHOICE in
        1)
            echo "You chose Option 1"
            ;;
        2)
            echo "You chose Option 2"
            ;;
        3)
            echo "You chose Option 3"
            ;;
esac

Thank you, I'm using your script