#!/bin/bash

# Root dir (for finding "misguided" torrents)
root="/torrents"
# Loading dir (for inactives)
loading="/torrents/loading"
# Watching dir (for actives)
watch="/torrents/watch"
# Archive dir - leave blank (archive="") if you don't use one
archive="/torrents/.archive"
# max # torrents at once
N=3

# max-1 for comparisons
N=$(($N-1))

# Move all "misguided" torrents (thrown into the root dir) to the "loading" dir
misguided=`ls "$root" | grep .*\.torrent | replace " " "~"`
for torrent in $misguided; do
	torrent=`echo $torrent | replace "~" " "`
	# Make all .torrent files rw/r/r
	chmod 644 "$root/$torrent"
	mv "$root/$torrent" "$loading/"
done

# If N or more active torrents, don't do anything
active=`ls "$watch" | grep .*\.torrent | grep ".*" -c`
if [ $active -gt $N ]; then
	exit 0;
fi

# If no inactive torrents, do nothing
inactive=`ls "$loading" | grep .*\.torrent | grep ".*" -c`
if [ $inactive -eq 0 ]; then
	exit 0;
fi

# While we have inactive torrents and less than 3 active, copy over inactives
tostart=`ls "$loading" | grep .*\.torrent | replace " " "~"`
for torrent in $tostart; do
	torrent=`echo "$loading/$torrent" | replace "~" " "`
	active=`ls "$watch" | grep .*\.torrent | grep ".*" -c`
	if [ $active -gt $N ]; then
		exit 0;
	fi
	if [ -n $archive ]; then
		cp "$torrent" "$archive/"
	fi
	mv "$torrent" "$watch/"
done