#!/usr/bin/env bash

BASE_DIR=$(cd "$(dirname "$0")" && pwd)
ROOT_DIR=$(realpath "$BASE_DIR/../..")
SCRIPTS_DIR="$ROOT_DIR/scripts"

source "$SCRIPTS_DIR/common/echo.sh"
source "$SCRIPTS_DIR/common/host.sh"

if [ "$HOST_OS" = "Linux" ]; then
  MD5SUM="md5sum"
elif [ "$HOST_OS" = "Mac" ]; then
  MD5SUM="md5 -q"
else  # unexpected
  _echo_e "Unknown host os :("
  exit 1
fi

_get_size() {
PYTHON_ARG="$1" python - <<EOF
import math
from os.path import getsize

def convert_size(size_bytes):
  if size_bytes == 0:
    return "0B"
  size_name = ("B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB")
  i = int(math.floor(math.log(size_bytes, 1024)))
  p = math.pow(1024, i)
  s = round(size_bytes / p, 2)
  return "%s %s" % (s, size_name[i])

import os
print(convert_size(getsize(os.environ["PYTHON_ARG"])))
EOF
}

_print_info() {
  file="$1"
  _echo "File: $file"
  _echo "Size: `_get_size "$file"`"
  _echo "MD5: `$MD5SUM "$file"`"
  _echo
}

if [ $# -eq 0 ]; then
  _echo_e "Usage: ./tools/checksum/md5sum.sh <file or directory>"
  exit 1
fi

if [ -d "$1" ]; then
  find "$1" -type f | while read -r f; do
    _print_info "$f"
  done
else
  _print_info "$1"
fi