#!/bin/bash
set -e

source ~/.config/workspace.conf
key_vol_path="/dev/disk/by-uuid/$BACKUP_KEY_VOL_UUID"
data_vol_path="/dev/disk/by-uuid/$BACKUP_DATA_VOL_UUID"

data_mnt=
remote_open() {
	data_mapper_name="$(lsblk "$data_vol_path" -no name --raw | awk 'NR==2')"
	key_mnt="$(lsblk "$key_vol_path" -no mountpoint)"
	if [ -z "$data_mapper_name" ]; then
		echo unlocking data luks vol..
		if [ -z "$key_mnt" ]; then
			echo mounting key vol..
			udisksctl mount -b "$key_vol_path"
			key_mnt="$(lsblk "$key_vol_path" -no mountpoint)"
		fi
		echo decrypting key..
		gpg --batch --yes --output /tmp/backup-keyfile --decrypt "$key_mnt/keyfile.gpg"
		udisksctl unlock -b "$data_vol_path" --key-file /tmp/backup-keyfile
		data_mapper_name="$(lsblk "$data_vol_path" -no name --raw | awk 'NR==2')"
		echo unlock ok, doing key cleanup
	fi
	rm -f /tmp/backup-keyfile
	[ -n "$key_mnt" ] && udisksctl unmount -b "$key_vol_path"
	data_mnt="$(lsblk "/dev/mapper/$data_mapper_name" -no mountpoint)"
	if [ -z "$data_mnt" ]; then
		echo mounting data vol..
		udisksctl mount -b "/dev/mapper/$data_mapper_name"
		data_mnt="$(lsblk "/dev/mapper/$data_mapper_name" -no mountpoint)"
	fi
	echo open done
}

remote_close() {
	data_mapper_name="$(lsblk "$data_vol_path" -no name --raw | awk 'NR==2')"
	if [ -n "$data_mapper_name" ]; then
		echo unmounting data vol..
		udisksctl unmount -b "/dev/mapper/$data_mapper_name"
	fi
	udisksctl lock -b "$data_vol_path"	# must be open here (fail if not)
	echo close done
}

declare -A repos
add_repos_local() {
	while IFS=  read -r -d $'\0'; do
		repo_path="$REPLY"
		[ ! -f "$repo_path/HEAD" ] && continue
		repo_path="$(realpath "$(dirname "$repo_path")")"
    	repos["$repo_path"]=1
	done < <(find "$@" -type d -name .git -print0)
}

add_repos_remote() {
	cd "$1"
	while IFS=  read -r -d $'\0'; do
		repo_path="$REPLY"
		[ ! -f "$repo_path/HEAD" ] && continue
		repo_path="/$(dirname "$repo_path")"
		[[ ! " $(groups) " == *" $(echo "$repo_path" | cut -d'/' -f3) "* ]] && continue
    	repos["$repo_path"]=1
	done < <(find "home" -type d -name '*.git' -print0 2>/dev/null)
}

sync_one() {
	local_path="$1"
	remote_path="$2$1/$(basename "$1").git"
	echo "$local_path <-> $remote_path"
	remote_url="file:///$remote_path"
	if [ ! -d "$local_path" ]; then
		mkdir -p "$(dirname "$local_path")"
		git clone "$remote_url" "$local_path"
	else
		cd "$local_path"
		git add .
		git diff-index --quiet HEAD || git commit -m autocommit || true
		if [ ! -d "$remote_path" ]; then
			mkdir -p "$(dirname "$remote_path")"
			git clone --bare "file:///$1" "$remote_path"
		else
			git pull "$remote_url"
			git push "$remote_url"
		fi
	fi
}

sync_repos() {
	for i in "${!repos[@]}"; do
		sync_one "$i" "$1"
		sync -f "$1"
	done
}

if [[ "$1" = "open" ]]; then
	remote_open
	exit 0
fi

remote_open
add_repos_remote	"$data_mnt"
add_repos_local		"/home/$(whoami)/dev" -maxdepth 2
add_repos_local		"/home/$(whoami)/know" -maxdepth 2
sync_repos "$data_mnt"
remote_close
echo ALL OK