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# Notes:
#  - Please install "jq" package before using this driver.
usage() {
    err "Invalid usage. Usage: "
    err "\t$0 init"
    err "\t$0 mount <mount dir> <json params>"
    err "\t$0 unmount <mount dir>"
    exit 1
}

err() {
    echo -ne $* 1>&2
}

log() {
    echo -ne $* >&1
}

ismounted() {
    MOUNT=`findmnt -n ${MNTPATH} 2>/dev/null | cut -d' ' -f1`
    if [ "${MOUNT}" == "${MNTPATH}" ]; then
        echo "1"
    else
        echo "0"
    fi
}

domount() {
    MNTPATH=$1

    local NFS_SERVER=$(echo $2 | jq -r '.server')
    local SHARE=$(echo $2 | jq -r '.share')
    local PROTOCOL=$(echo $2 | jq -r '.protocol')
    local ATIME=$(echo $2 | jq -r '.atime')
    local READONLY=$(echo $2 | jq -r '.readonly')

    if [ -n "${PROTOCOL}" ]; then
        PROTOCOL="tcp"
    fi

    if [ -n "${ATIME}" ]; then
        ATIME="0"
    fi

    if [ -n "${READONLY}" ]; then
        READONLY="0"
    fi

    if [ "${PROTOCOL}" != "tcp" ] && [ "${PROTOCOL}" != "udp" ] ; then
        err "{ \"status\": \"Failure\", \"message\": \"Invalid protocol ${PROTOCOL}\"}"
        exit 1
    fi

    if [ $(ismounted) -eq 1 ] ; then
        log '{"status": "Success"}'
        exit 0
    fi

    mkdir -p ${MNTPATH} &> /dev/null

    local NFSOPTS="${PROTOCOL},_netdev,soft,timeo=10,intr"
    if [ "${ATIME}" == "0" ]; then
        NFSOPTS="${NFSOPTS},noatime"
    fi

    if [ "${READONLY}" != "0" ]; then
        NFSOPTS="${NFSOPTS},ro"
    fi

    mount -t nfs -o${NFSOPTS} ${NFS_SERVER}:/${SHARE} ${MNTPATH} &> /dev/null
    if [ $? -ne 0 ]; then
        err "{ \"status\": \"Failure\", \"message\": \"Failed to mount ${NFS_SERVER}:${SHARE} at ${MNTPATH}\"}"
        exit 1
    fi
    log '{"status": "Success"}'
    exit 0
}

unmount() {
    MNTPATH=$1
    if [ $(ismounted) -eq 0 ] ; then
        log '{"status": "Success"}'
        exit 0
    fi

    umount ${MNTPATH} &> /dev/null
    if [ $? -ne 0 ]; then
        err "{ \"status\": \"Failed\", \"message\": \"Failed to unmount volume at ${MNTPATH}\"}"
        exit 1
    fi

    log '{"status": "Success"}'
    exit 0
}

op=$1

if ! command -v jq >/dev/null 2>&1; then
    err "{ \"status\": \"Failure\", \"message\": \"'jq' binary not found. Please install jq package before using this driver\"}"
    exit 1
fi

if [ "$op" = "init" ]; then
    log '{"status": "Success", "capabilities": {"attach": false}}'
    exit 0
fi

if [ $# -lt 2 ]; then
    usage
fi

shift

case "$op" in
    mount)
        domount $*
        ;;
    unmount)
        unmount $*
        ;;
    *)
        log '{"status": "Not supported"}'
        exit 0
esac

exit 1