#!/bin/bash

# 1/10 = 0.1 = 10%
thresholdFactor=10
sleepTime=10m

#while true; do

if [ ! -d repositories ]; then mkdir repositories; fi
if [ ! -d snapshots ]; then mkdir snapshots; fi
	
cd repositories
for repository in *; do
	if [ ! -d "$repository" ]; then continue; fi
	if [ ! -d "../snapshots/$repository" ]; then cp -rf "$repository" ../snapshots; fi
	
	log=$(echo [$(date +"%Y-%m-%d %H:%M:%S")] Checking \"$repository\")
	echo "$log"

	cd "$repository"
	gitOutput=$(git pull --recurse-submodules=on-demand)
	echo "$gitOutput"
	cd ..
	if [ "$gitOutput" == "Already up to date." ]; then continue; fi
	
	echo "$log" >> ../log.txt
	echo "$gitOutput" >> ../log.txt

	snapshotSize=$(($(du -sb "../snapshots/$repository" | cut -f1) - $(du -sb "../snapshots/$repository/.git" | cut -f1)))
	if [ $(($snapshotSize - ($snapshotSize / $thresholdFactor))) -lt $(($(du -sb "$repository" | cut -f1) - $(du -sb "$repository/.git" | cut -f1))) ]; then
		log=$(echo [$(date +"%Y-%m-%d %H:%M:%S")] Updating \"$repository\")
		echo "$log"
		echo "$log" >> ../log.txt
		echo >> ../log.txt

		rm -rf "../snapshots/$repository"
		cp -rf "$repository" ../snapshots
		continue
	fi
	
	snapshotTime=$(echo [$(date +"%Y-%m-%d %H'%M'%S")])
	log=$(echo $snapshotTime Snapshotting \"$repository\")
	echo "$log"
	echo "$log" >> ../log.txt
	echo >> ../log.txt

	tar -czf "../snapshots/$snapshotTime $repository.tar.gz" "../snapshots/$repository"
	rm -rf "../snapshots/$repository"
	cp -rf "$repository" ../snapshots
done
cd ..

#	sleep $sleepTime
#done