#!/bin/bash

## Remote Server Backup Script
## Author: Ze'ev Schurmann
## Reddit: u/thisiszeev
## License: MIT

## Dependancies:
## ffprobe (ffmpeg), jq

## Please consider making me small donation. Even though my scripts are open source and free to use, I still need to eat. And the
## occasional bottle of wine also goes down well.
## $5 buys me a cup of coffee
## $10 buys me a nice burger
## $20 buys me a bottle of wine
## Anything above that will be awesome as well.
## You can send me a donation via Paypal https://www.paypal.com/paypalme/thisiszeev
## Drop me a message on Reddit if you do make a donation.
## Support is only offered freely to those who donate $20 or more.
## Your donation contributes to further development.
## If you need a custom script, contact me on Reddit for pricing.

rm -f tmp.lst

if [[ ! -f paths.lst ]]; then
  echo "Please create a text file called paths.lst and put /the/absolute/path to each library on a seperate line."
  exit 1
fi

if [[ ! -f library.tsv ]]; then
  echo -e "title\tartist\talbum\tgenre\tdate\ttrack_number\ttrack_total\tbitrate\tduration\tfilename\tfilesize\tpath" >> library.tsv
fi

added=0

while read -r path; do

  find "$path" -type f -name "*.mp3" > tmp.lst

  while read -r mp3; do

    test=$(cat library.tsv | grep -F "$mp3")

    if [[ -z $test ]]; then

      ((added++))
      echo "Found new MP3 at $mp3"
      json=$(ffprobe -print_format json -show_format "$mp3" 2> /dev/null | jq -c .)
      title="$(echo "$json" | jq -r .format.tags.title)"
      artist="$(echo "$json" | jq -r .format.tags.artist)"
      album="$(echo "$json" | jq -r .format.tags.album)"
      genre="$(echo "$json" | jq -r .format.tags.genre)"
      date="$(echo "$json" | jq -r .format.tags.date)"
      track_number="$(echo "$json" | jq -r .format.tags.track)"
      track_total="$(echo "$json" | jq -r .format.tags.TRACKTOTAL)"
      bitrate="$(($(echo "$json" | jq -r .format.bit_rate)/1000))"
      runtime="$(echo "$json" | jq -r .format.duration)"
      runtime="${runtime%%.*}"
      min=$((runtime/60))
      sec=$(printf %02d $((runtime%60)))
      duration="$min:$sec"
      filename="${mp3##*/}"
      size="$(echo "$json" | jq -r .format.size)"
      mb=$((size/1048576))
      kb=$((size%1048576))
      filesize="$mb.${kb:0:1} MB"
      echo -e "$title\t$artist\t$album\t$genre\t$date\t$track_number\t$track_total\t$bitrate\t$duration\t$filename\t$filesize\t$mp3" >> library.tsv

    fi
  done < tmp.lst

  rm -f tmp.lst

done < paths.lst

if [[ $added == 0 ]]; then
  echo "Move along nothing to see here..."
else
  echo "Added $added MP3s to library.tsv. Total of $(($(cat library.tsv | wc -l)-1)) MP3s in library.tsv."
fi