#!/bin/bash

function get_duration {
  total_len=0
  for file in `pwd`/*; do
    cur_len=$(ffprobe -i $file -show_entries format=duration -v quiet -of csv="p=0")
    cur_len=${cur_len%.*}
    total_len=$((total_len+cur_len))
  done
  echo $total_len
}

file_deleted=0
min_len=$1
dur=$(get_duration)
for file in `pwd`/*; do
  if [ ${file: -4} == ".mp3" ]; then
    len=$(ffprobe -i $file -show_entries format=duration -v quiet -of csv="p=0")
    echo -n "$file got lenght of $len "
    if [ ${len%.*} -gt ${min_len} ]; then
      echo "- PRESERVED"
    else
      rm $file
      echo "- DELETED"
      file_deleted++
    fi
  fi
done

dur=$(get_duration)
echo "STATS ---------------------"
echo "File deleted: $file_deleted"
echo "Total audio lenght BEFORE deleting: $dur"
echo "Total audio lenght AFTER deleting: $dur"
echo "Done."