#!/bin/bash

logPath=log.txt

# 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
	
	cd ..
	echo "$log" >> "$logPath"

	if [ "$gitOutput" == "" ]; then
		cd "repositories/$repository"
		gitURL=$(git config --get remote.origin.url)
		cd ..
		rm -rf "$repository"
		gitOutput=$(git clone --recurse-submodules --recursive $gitURL)
		cd ..
		if [ "$gitOutput" == "" ]; then
			log=$(echo [$(date +"%Y-%m-%d %H:%M:%S")] Unable to check for updates to \"$repository\")
			echo "$log"
			echo "$log" >> "$logPath"
			echo >> "$logPath"

			cp -rf "snapshots/$repository" repositories
			
			cd repositories
			continue;
		fi

		echo "$gitOutput"
	fi

	echo "$gitOutput" >> "$logPath"

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

		rm -rf "snapshots/$repository"
		cp -rf "repositories/$repository" snapshots

		cd repositories
		continue
	fi
	
	snapshotTime=$(echo [$(date +"%Y-%m-%d %H'%M'%S")])
	log=$(echo $snapshotTime Snapshotting \"$repository\")
	echo "$log"
	echo "$log" >> "$logPath"
	echo >> "$logPath"

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

	cd repositories
done
cd ..

#	sleep $sleepTime
#done