#!/usr/bin/env bash

set -eu -o pipefail
shopt -s globstar

storePath="$1"

####################
# Files Metrics
####################

uncompressedResultFile="${2}"
compressedResultFile="${3}"
export tmpCompressedFiles
tmpCompressedFiles="$(mktemp -d)"
trap 'rm -rf ${tmpCompressedFiles}' EXIT

echo "Sha256;Size" > "${uncompressedResultFile}"
echo "Sha256;Size" > "${compressedResultFile}"

closure=$(nix path-info -r "${storePath}")

for path in ${closure}; do
    find "${path}" -type f -print0 | \
        while read -r -d $'\0' file
        do
            size=$(stat --printf="%s" "$file")
            sha256=$(sha256sum "$file" | cut -d " " -f 1)
            printf "%s;%s\n" "${sha256}" "${size}" >> "${uncompressedResultFile}"
            xz -zc6e "${file}" > "${tmpCompressedFiles}"/"${sha256}".xz
        done
done

find "${tmpCompressedFiles}" -type f -name "*.xz" -exec bash -c '
   size=$(stat --printf="%s" "$1")
   sha256=$(sha256sum "$1" | cut -d " " -f 1)
   printf "%s;%s\n" "${sha256}" "${size}"
' shell {} ";" >> "${compressedResultFile}"