#!/bin/bash

#TODO update: each folder has some metadata file in it to describe which folders to [in/ex]clude, and maybe some other rules. this metadata should either be in the filesystem itself or stored in a DB

CONFIGFILE=`realpath ~/.config/datasync/files`
DEST_HOST="hb" #destination host machine where we want to backup files to
		#todo what is the assumed file layout on this host? 
		#todo add support for multiple destinations

if [[ $1 ]]; then
    DBG=1
    echo "DEBUG MODE :) yeeee"
fi

#only continue if the server is reachable
statuscheck=`ssh hb echo test 2>&1`
if [[ $statuscheck == *onnect* ]]; then
	exit 1
fi

#backs up commonly modified files
for f in `cat ${CONFIGFILE}`; do
        if [[ ${f:0:1} == '#' ]]; then
		continue
	fi
	#f=`echo ${f} | sed 's,~,/home/'${USER}',g'`
   	f=`realpath ${f}`
	
    if [[ $DBG ]]; then
        echo "file: "$f
    fi
	#check if last modified time of local is newer
		#thought about also checking entire dir size (with du) but wont work because remote has more files that are no longer on local
		#so i will traverse recursively and only check if the file exists on local
    rt=`ssh hb "date -r ${f} +%s"`
	lt=`date -r ${f} +%s`
    if [[ $DBG ]]; then
        echo "file: "$f
        echo "remote time: "$rt
        echo "local time: "$lt
    fi
	if [[ -z ${rt} || ( ${lt} != ${rt} && ${lt} -ge ${rt} ) ]]; then #local file is newer, so update
		#make sure to have trailing '/' if directory, because rsync is weird
		if [[ -d ${f} ]]; then
			f=${f}"/"
		fi
        if [[ $DBG ]]; then
            echo "local file is newer. updating."
            echo "execute update? (y/n)"
            read a
            if [[ $a == "y" || $a == "Y" ]]; then
                echo "backing up "$f
                backup_simple ${f} ${f} 
            else
                echo "not backing up "$f
            fi
        else
            echo $f
            backup_simple ${f} ${f}
        fi
	fi
done