#!/usr/bin/env bash
# -*- coding: utf-8 -*-

set -euo pipefail

# Version 2024/01/28 - Changelog: https://gist.github.com/AriRexouium/425d07d5e651b479069d0d56e4b5fa60
# This script provides a wrapper to batch protect your files with PAR2 and GPG.
#
# Usage: ./batchprotect.sh
#
# License:
#   This shell script is based on the example from
#   https://wiki.archlinux.org/title/Parchive#Batch-protecting_your_files
#   which is licensed under the GNU Free Documentation License 1.3 or later
#   For more information, see https://www.gnu.org/licenses/fdl-1.3.html

# Colors
ES="\x1B"
GREEN="$ES[0;32m"
NC="$ES[0m"

# Internal Field Separator
OIFS="${IFS}"
IFS=$'\n'

# Variables
gpgKey="ACE142C15F53182454DEE0802B45FEC5D0B181E7"
redundancy=10

list=$(find . -type f | shuf)
for file in ${list}; do
  ending="${file//\(.*\)\.\(.*\)$/\2/}" # Extract the file extension from the filename using sed

  # Check if the PAR2 file doesn't already exist, the file isn't a PAR2 or signature file, and the file isn't empty
  if [ ! -e "${file}-${redundancy}p.par2" ] && [ "${ending}" != "par2" ] && [ "${ending}" != "sig" ] && [ "$(stat --format=%s "${file}")" != 0 ]; then
    echo -e "${GREEN}Creating archive for ${file}.${NC}"
    par2 c -qq -n1 -r"${redundancy}" "${file}" > /dev/null 2>&1 | tee /dev/tty
    rm "${file}.par2"
    mv "${file}.vol"*"par2" "${file}-${redundancy}p.par2"
  fi

  # Check if the signature file doesn't already exist and the file isn't a PAR2 or signature file
  if [ ! -e "${file}.sig" ] && [ "${ending}" != "par2" ] && [ "${ending}" != "sig" ]; then
    echo -e "${GREEN}Creating signature for ${file}.${NC}"
    gpg --quiet --default-key "${gpgKey}" --detach-sign --yes "${file}"
  fi
done

IFS="${OIFS}"