#!/usr/local/bin/bash
# shellcheck disable=SC1003

# yml Parser function
# Based on https://gist.github.com/pkuczynski/8665367
# shellcheck disable=SC2086
parse_yaml() {
   prefix=${2}
   s='[[:space:]]*' w='[a-zA-Z0-9_]*' fs=$(echo @|tr @ '\034')
   local prefix
   local s w fs
   sed -ne "s|^\($s\)\($w\)$s:$s\"\(.*\)\"$s\$|\1$fs\2$fs\3|p" \
        -e "s|^\($s\)\($w\)$s:$s\(.*\)$s\$|\1$fs\2$fs\3|p"  "${1}" |
   awk -F"${fs}" '{
      indent = length($1)/2;
      vname[indent] = $2;
      for (i in vname) {if (i > indent) {delete vname[i]}}
      if (length($3) > 0) {
         vn=""; for (i=0; i<indent; i++) {vn=(vn)(vname[i])("_")}
         printf("export %s%s%s=\"%s\"\n", "'$prefix'",vn, $2, $3);
      }
   }'
}

# automatic update function
gitupdate() {
echo "checking for updates using Branch: $1"
git fetch
git update-index -q --refresh
CHANGED=$(git diff --name-only origin/"$1")
if [ -n "$CHANGED" ];
then
    echo "script requires update"
    git reset --hard
    git checkout "${1}"
    git pull
    echo "script updated, please restart the script manually"
    exit 1
else
    echo "script up-to-date"
fi
}

jailcreate() {
echo "Checking config..."
jailname="${1}"
jailpkgs="${1}_pkgs"
jailinterfaces="${1}_interfaces"
jailip4="${1}_ip4_addr"
jailgateway="${1}_gateway"
jaildhcp="${1}_dhcp"
setdhcp=${!jaildhcp}

if [ -z "${!jailinterfaces}" ]; then 
	jailinterfaces="vnet0:bridge0"
else
	jailinterfaces=${!jailinterfaces}
fi

if [ -z "${setdhcp}" ] && [ -z "${!jailip4}" ] && [ -z "${!jailgateway}" ]; then 
	echo 'no network settings specified in config.yml, defaulting to dhcp="on"'
	setdhcp="on"
fi

if [ -z "${!jailname}" ]; then 
	echo "ERROR, jail not defined in config.yml"
	exit 1
else
	echo "Creating jail for $1"
	# shellcheck disable=SC2154
	pkgs="$(sed 's/[^[:space:]]\{1,\}/"&"/g;s/ /,/g' <<<"${global_jails_pkgs} ${!jailpkgs}")"
	echo '{"pkgs":['"${pkgs}"']}' > /tmp/pkg.json
	if [ "${setdhcp}" == "on" ]
	then
		# shellcheck disable=SC2154
		if ! iocage create -n "${1}" -p /tmp/pkg.json -r "${global_jails_version}" interfaces="${jailinterfaces}" dhcp="on" vnet="on" allow_raw_sockets="1" boot="on" -b
		then
			echo "Failed to create jail"
			exit 1
		fi
	else
		# shellcheck disable=SC2154
		if ! iocage create -n "${1}" -p /tmp/pkg.json -r "${global_jails_version}" interfaces="${jailinterfaces}" ip4_addr="vnet0|${!jailip4}" defaultrouter="${!jailgateway}" vnet="on" allow_raw_sockets="1" boot="on" -b
		then
			echo "Failed to create jail"
			exit 1
		fi
		
	fi

	rm /tmp/pkg.json
	echo "creating jail config directory"
	# shellcheck disable=SC2154
	createmount "${1}" "${global_dataset_config}"
	createmount "${1}" "${global_dataset_config}"/"${1}" /config
	
	# Create and Mount portsnap
	echo "Mounting and fetching ports"
	createmount "${1}" "${global_dataset_config}"/portsnap
	createmount "${1}" "${global_dataset_config}"/portsnap/db /var/db/portsnap
	createmount "${1}" "${global_dataset_config}"/portsnap/ports /usr/ports
	
	iocage exec "${1}" "if [ -z /usr/ports ]; then portsnap fetch extract; else portsnap auto; fi"
	
	echo "Jail creation completed for ${1}"
fi	
	
}

# $1 = jail name
# $2 = Dataset
# $3 = Target mountpoint
# $4 = fstab prefernces
createmount() {
	if [ -z "$2" ] ; then
		echo "ERROR: No Dataset specified to create and/or mount"
		exit 1
	else
		if [ ! -d "/mnt/$2" ]; then
			echo "Dataset does not exist... Creating... $2"
			zfs create "${2}"
		else
			echo "Dataset already exists, skipping creation of $2"
		fi

		if [ -n "$1" ] && [ -n "$3" ]; then
			iocage exec "${1}" mkdir -p "${3}"
			if [ -n "${4}" ]; then
				iocage fstab -a "${1}" /mnt/"${2}" "${3}" "${4}"
			else
				iocage fstab -a "${1}" /mnt/"${2}" "${3}" nullfs rw 0 0
			fi
		else
			echo "No Jail Name or Mount target specified, not mounting dataset"
		fi

	fi
}
export -f createmount