# Functions to manage dates depending on OS
if [ "$OSTYPE" == "linux-gnu" ] || [ "$OSTYPE" == "linux-musl" ]; then
  TEMP_REPORT_FILE=$(mktemp -t -p /tmp prowler.cred_report-XXXXXX)
  # function to compare in days, usage how_older_from_today date
  # date format %Y-%m-%d
  how_older_from_today()
    {
      DATE_TO_COMPARE=$1
      TODAY_IN_DAYS=$(date -d "$(date +%Y-%m-%d)" +%s)
      DATE_FROM_IN_DAYS=$(date -d $DATE_TO_COMPARE +%s)
      DAYS_SINCE=$((($TODAY_IN_DAYS - $DATE_FROM_IN_DAYS )/60/60/24))
      echo $DAYS_SINCE
    }
  # function to convert from timestamp to date, usage timestamp_to_date timestamp
  # output date format %Y-%m-%d
  timestamp_to_date()
    {
      # remove fractions of a second
      TIMESTAMP_TO_CONVERT=$(echo $1 | cut -f1 -d".")
      OUTPUT_DATE=$(date -d @$TIMESTAMP_TO_CONVERT +'%Y-%m-%d')
      echo $OUTPUT_DATE
    }
  decode_report()
    {
      base64 -d
    }
elif [[ "$OSTYPE" == "darwin"* ]]; then
  # BSD/OSX commands compatibility
  TEMP_REPORT_FILE=$(mktemp -t prowler.cred_report-XXXXXX)
  how_older_from_today()
      {
        DATE_TO_COMPARE=$1
        TODAY_IN_DAYS=$(date +%s)
        DATE_FROM_IN_DAYS=$(date -jf %Y-%m-%d $DATE_TO_COMPARE +%s)
        DAYS_SINCE=$((($TODAY_IN_DAYS - $DATE_FROM_IN_DAYS )/60/60/24))
        echo $DAYS_SINCE
      }
  timestamp_to_date()
    {
      # remove fractions of a second
      TIMESTAMP_TO_CONVERT=$(echo $1 | cut -f1 -d".")
      OUTPUT_DATE=$(date -r $TIMESTAMP_TO_CONVERT +'%Y-%m-%d')
      echo $OUTPUT_DATE
    }
  decode_report()
    {
      base64 -D
    }
elif [[ "$OSTYPE" == "cygwin" ]]; then
  # POSIX compatibility layer and Linux environment emulation for Windows
  TEMP_REPORT_FILE=$(mktemp -t -p /tmp prowler.cred_report-XXXXXX)
  how_older_from_today()
      {
        DATE_TO_COMPARE=$1
        TODAY_IN_DAYS=$(date -d "$(date +%Y-%m-%d)" +%s)
        DATE_FROM_IN_DAYS=$(date -d $DATE_TO_COMPARE +%s)
        DAYS_SINCE=$((($TODAY_IN_DAYS - $DATE_FROM_IN_DAYS )/60/60/24))
        echo $DAYS_SINCE
      }
  timestamp_to_date()
    {
      # remove fractions of a second
      TIMESTAMP_TO_CONVERT=$(echo $1 | cut -f1 -d".")
      OUTPUT_DATE=$(date -d @$TIMESTAMP_TO_CONVERT +'%Y-%m-%d')
      echo $OUTPUT_DATE
    }
  decode_report()
    {
      base64 -d
    }
else
      echo "Unknown Operating System! Valid \$OSTYPE: linux-gnu, linux-musl, darwin* or cygwin"
      echo "Found: $OSTYPE"
      EXITCODE=1
      exit $EXITCODE
fi