#!/bin/bash

print_usage() {
    echo "Usage:"
    echo "  $0 <source_dir> <backup_dir>"
    echo "  $0 -s <source_dir> -b <backup_dir>"
    echo "  $0 -b <backup_dir> -s <source_dir>"
    echo
    echo "Examples:"
    echo "  $0 ../data/ ../backups/"
    echo "  $0 -s ../data/ -b ../backups/"
    echo "  $0 -b ../backups/ -s ../data/"
}

if [[ $# -eq 0 ]]; then
    print_usage
    exit 
fi

if [[ $# -eq 2 && $1 != -* && $2 != -* ]]; then
    SOURCE=$1
    BACKUP=$2

elif [[ $# -eq 4 ]]; then
    while [[ $# -gt 0 ]]; do
        case $1 in
            -s)
                SOURCE=$2
                shift 2
                ;;
            -b)
                BACKUP=$2
                shift 2
                ;;
            *)
                print_usage
                exit 
                ;;
        esac
    done
else
    print_usage
    exit 
fi

if [[ -z "$SOURCE" || -z "$BACKUP" ]]; then
    print_usage
    exit
fi

if [[ ! -d "$SOURCE" ]]; then
    echo "Error: '$SOURCE' is not a valid directory"
    exit
fi

mkdir -p "$BACKUP"

cp -r "$SOURCE"/* "$BACKUP"/

echo "Backup completed successfully!"