#!/usr/bin/env sh

PMP_HOST='192.168.86.117';
PMP_USER='root';
PMP_PASS='plex';

LATEST_URL='https://nightlies.plex.tv/public-test/plexmediaplayer/embedded-testing/latest-full/';

PMP_UPDATE_FOLDER='/storage/.update/'
CURRENT_FILE='current_pmp.txt';
HASH_PATTERN='([0-9a-f]{8})';

cd "$(dirname "$0")";
touch "${CURRENT_FILE}";
LOADED_TAR=$(cat "${CURRENT_FILE}");
LOADED_HASH=$(cat "${CURRENT_FILE}" | grep -Eoi $HASH_PATTERN);
echo "Currently loaded tar: ${LOADED_TAR} (${LOADED_HASH})";

echo "Checking latest tar";
LATEST_TAR=$(curl --silent "${LATEST_URL}" | grep -Eoi '<a [^>]+>' |  grep -Eo 'href="[^\"]+"' | grep -Eo '[^/"]+arm.tar');
LATEST_HASH=$(echo $LATEST_TAR | grep -Eoi $HASH_PATTERN);
echo "Latest available tar: ${LATEST_TAR} (${LATEST_HASH})";

if [ "$LOADED_HASH" != "$LATEST_HASH" ]; then
	echo "Found new version!";
	wget "${LATEST_URL}${LATEST_TAR}";

	ssh-keygen -F "${PMP_HOST}";
	ZERO_IF_HOST_IS_KNOWN=$?;
	if [ $ZERO_IF_HOST_IS_KNOWN != 0 ]; then
		echo "Adding '${PMP_HOST}' to '~/.ssh/known_hosts'";
		USER_HOME=$(eval echo ~$USER)
		ssh-keyscan -H "${PMP_HOST}" >> "${USER_HOME}/.ssh/known_hosts";
		rc=$?; if [ $rc != 0 ]; then exit $rc; fi
	fi

	echo "Deleting any update files from Raspberry Pi Plex Media Player";
	sshpass -p "${PMP_PASS}" ssh "${PMP_USER}@${PMP_HOST}" "rm -f ${PMP_UPDATE_FOLDER}*.tar";
	rc=$?; if [ $rc != 0 ]; then exit $rc; fi

	echo "Uploading to Raspberry Pi Plex Media Player (this might take a while...)";
	sshpass -p "${PMP_PASS}" scp "${LATEST_TAR}" "${PMP_USER}@${PMP_HOST}:${PMP_UPDATE_FOLDER}";
	rc=$?; if [ $rc != 0 ]; then exit $rc; fi

	echo "Cleaning up downloads";
	rm -f ./*.tar;

	echo "Updating current hash."
	echo "${LATEST_TAR}" > "${CURRENT_FILE}";

	echo "Update successful, restarting Raspberry Pi to apply the update.";
	sshpass -p "${PMP_PASS}" ssh "${PMP_USER}@${PMP_HOST}" "{ sleep 1; reboot; } > /dev/null &";
	rc=$?; if [ $rc != 0 ]; then exit $rc; fi
else
	echo "No new version found.";
	exit 1;
fi
exit 0;