#!/bin/bash

# Ensure we have a valid TMPDIR
if [ ! -d "${TMPDIR}" ]; then
        TMPDIR="`getconf DARWIN_USER_TEMP_DIR 2>/dev/null`"
        if [ ! -d "${TMPDIR}" ]; then
                TMPDIR="/var/tmp"
        fi
        if [ ! -d "${TMPDIR}" ]; then
                TMPDIR="/tmp"
        fi
fi

# Config
HOST="vera.uberzach.com"
TIMEOUT=10
SHARE="media"
LOCK="${TMPDIR}/mountMedia.mounting"
REMOTE_USER="${USER}"
LOCAL_MEDIA="/Users/Shared/Plex"
MEDIA_CHECK_DIR="TV/John Plays FIFA"

# Globals
OFFLINE=0
LOCAL_LINK=0
MEDIA=""

# Allow forced updates
if [ -n "${FORCE}" ] && [ "${FORCE}" -ne "0" ]; then
	FORCE=1
else
	FORCE=0
fi

# Hack for mismatched usernames
if [ "${USER}" == "tv" ]; then
	REMOTE_USER="atv"
fi

function cleanup {
	rm -f "${LOCK}"
	exit $1
}

function findMedia {
	MEDIA=""
	
	# Find media at the root of any mounted volume with a name starting with $SHARE
	for i in "/Volumes/${SHARE}"*; do
		if [ -d "${i}" ] && [ -d "${i}/${MEDIA_CHECK_DIR}" ]; then
			MEDIA="${i}"
		fi
	done
	
	# Find offline media if we're offline
	if [ $OFFLINE -gt 0 ]; then
		if [ -z "${MEDIA}" ] && [ -d "${LOCAL_MEDIA}" ] && [ -d "${LOCAL_MEDIA}/${MEDIA_CHECK_DIR}" ]; then
			MEDIA="${LOCAL_MEDIA}"
		fi
	fi
}

function writeLinks {
	DEST="${1}"
	if [ -e "${HOME}/media" ] || [ -h "${HOME}/media" ]; then
		rm -f "${HOME}/media"
		ln -s "${DEST}" "${HOME}/media"
	else
		echo "No such path: ${HOME}/media" 1>&2
		cleanup 1
	fi
}

# Lock
touch "${LOCK}"
read MOUNT_PID < "${LOCK}"
if [ -n "${MOUNT_PID}" ]; then
	if ps -A -o pid | grep -q "${MOUNT_PID}"; then
		sleep 5
		exit 1
	fi
fi
echo $$ > "${LOCK}"
export MEDIA_MOUNTING=$$

# Determine if we have a remote link
if [ -h "${HOME}/media" ] && readlink "${HOME}/media" | grep -qE "^${LOCAL_MEDIA}"; then
	LOCAL_LINK=1
fi

# Skip this whole shebang if we've got a valid, remote link
if [ $LOCAL_LINK -eq 0 ] && [ $FORCE -eq 0 ] && ~/bin/video/isMediaMounted; then
	cleanup 0
fi

# Check for connectivity and server live-ness
if ! ~/bin/video/timeout -t "${TIMEOUT}" nc -z "${HOST}" 548 >/dev/null 2>&1 || \
	! ~/bin/video/timeout -t "${TIMEOUT}" nc -z "${HOST}" 139 >/dev/null 2>&1; then
		echo "`basename "${0}"`: Host not available: ${HOST}" 1>&2
		OFFLINE=1
fi

# Drop local links if we're online
if [ $OFFLINE -eq 0 ] && [ $LOCAL_LINK -ne 0 ]; then
	writeLinks "/var/empty"
fi

# At this point any valid link is acceptable
if [ $FORCE -eq 0 ] && ~/bin/video/isMediaMounted; then
	cleanup 0
fi

# Connect if needed and possible
findMedia
if [ -z "${MEDIA}" ] && [ $OFFLINE -eq 0 ]; then
	~/bin/video/timeout -t 30 osascript -e 'tell application "Finder" to mount volume "smb://'"${REMOTE_USER}@${HOST}/${SHARE}"'"'
	sleep 5
fi

# Create links to the best media we can find
findMedia
if [ -n "${MEDIA}" ]; then
	writeLinks "${MEDIA}"
else
	echo "`basename "${0}"`: Unable to link media volume" 1>&2
	cleanup 1
fi

# Exit cleanly
cleanup 0