#!/usr/bin/env bash

# https://betterdev.blog/minimal-safe-bash-script-template/
# https://medium.com/better-programming/my-minimal-safe-bash-script-template-300759114040

set -E -o errexit -o nounset -o pipefail
trap cleanup SIGINT SIGTERM ERR EXIT

readonly SCRIPT_NAME=$(basename "${BASH_SOURCE[0]}")
readonly SCRIPT_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" &>/dev/null && pwd -P)

function usage() {
    cat <<EOT
Usage: ${script_name} [-h | --help] [-a <ARG>] [--abc <ARG>] [-f | --flag]
DESCRIPTION
    Your description here.
OPTIONS:
-h, --help
        Print this help and exit.
-f, --flag
        Description for flag option.
-a
        Description for the -a option.
--abc
        Description for the --abc option.
EOT
}

function cleanup() {
  trap - SIGINT SIGTERM ERR EXIT
  # script cleanup here
}

function msg() {
  echo >&2 -e "${1-}"
}

function die() {
  local -r msg="$1"
  local -r code="${2:-90}"
  echo "${msg}" >&2
  exit "${code}"
}

function parse_params() {
    local -r args=("${@}")

    while true; do    
    
    case "$1" in
    --abc)
            abc_option_flag=1
            shift
            readonly abc_arg="$1"
            shift
            ;;

    -a)
            a_option_flag=1
            shift
            readonly a_arg="$1"
            shift
            ;;

    --help|-h)
            usage
            exit 0
            shift
            ;;
    
    --flag|-f)
            flag_option_flag=1
            shift
            ;;
    
    --)
            shift
            break
            ;;
    
    *)
            break
            ;;
    esac
    done
}

# MAIN

a_option_flag=0
abc_option_flag=0
flag_option_flag=0


parse_params "$@"

if ((flag_option_flag)); then
    echo "flag option set"
fi

if ((abc_option_flag)); then            # Check if the flag options are set or ON:
    # Logic for when --abc is set.
    # "${abc_arg}" should also be set.
    echo "Using --abc option -> arg: [${abc_arg}]"
fi

if ((a_option_flag)); then
    # Logic for when -a is set.
    # "${a_arg}" should also be set.
    echo "Using -a option -> arg: [${a_arg}]"
fi