#!/bin/sh
# Script by Ypnose - http://ywstd.fr

C_DIR1="$1"
C_DIR2="$2"

rec_list() {
	( cd "$1" >/dev/null && find * -type f )
}

strip_sums() {
	SUM="$(b3sum "$1")" && printf "%s\n" "${SUM%% *}"
}

check_file() {
	# Verify files from first directory
	rec_list "$C_DIR1" | while IFS= read -r C_FILE; do
		C_CUR="${C_DIR1}/${C_FILE}"
		C_DES="${C_DIR2}/${C_FILE}"
		if [ -f "$C_DES" ]; then
			if [ "$(strip_sums "$C_CUR")" = "$(strip_sums "$C_DES")" ]; then
				C_STATUS="OK"
			else
				C_STATUS="MISMATCH"
			fi
		else
			C_STATUS="MISSING in $C_DIR2"
		fi
		printf "%s: %s\n" "$C_FILE" "$C_STATUS"
	done

	# List files from second directory missing in the first directory
	rec_list "$C_DIR2" | while IFS= read -r C_FILE; do
		if [ ! -f "${C_DIR1}/${C_FILE}" ]; then
			printf "%s: MISSING in %s\n" "$C_FILE" "$C_DIR1"
		fi
	done
}

if [ "$#" -ne 2 ] || [ ! -d "$C_DIR1" ] || [ ! -d "$C_DIR2" ]; then
	printf "usage: %s [DIR1] [DIR2]\n" "${0##*/}" >&2
	exit 1
fi

check_file | sort -df

exit