#!/bin/bash

input=""
prefix=""
bucket=""

while [[ "$#" -gt 0 ]]; do
	case $1 in
	-p | --prefix)
		shift
		prefix="/$1"
		;;
	-b | --bucket)
		shift
		bucket="$1"
		;;
	*)
		input="$1"
		;;
	esac

	shift
done

if [ -z "$bucket" ]; then
	echo "Bucket name is required"
	exit 1
fi

if [ -d "$input" ]; then
	cd $input

	if [ ! -d .git ]; then
		echo "Specified directory is not a git repository"
		exit 1
	fi

	diff=$(git diff --name-only)
	files=($diff)
	pwd="$(pwd)"

	echo "Backing up modified tracked files in '$pwd' to S3 bucket '$bucket'..."

	for file in "${files[@]}"; do
		path="$pwd/$file"
		aws s3 cp "$path" "s3://$bucket$prefix$path"
	done
elif [ -f "$input" ]; then
	pwd="$(pwd)"
	path="$pwd/$input"

	echo "Backing up individual file to S3 bucket '$bucket'..."

	aws s3 cp "$path" "s3://$bucket$prefix$path"
else
	echo "No file or directory '$input'"
	exit 1
fi