#!/bin/bash
# depends on sshfs  fuse for ssh
# smount <sshfs options>  host:dir mountpoint <ssh run opts> -- < more sshoptions >
# example: smount
module_load filesystem # mounted
module_load net-utils  # host_reachable
module_load helpers
module_load ssh

function smount() {

  local user=${DEFAULT_USER:-ubuntu}
  local opts; local ropts; local sshopts
  local host; local sshcmd; local cmd

  local dir; local MNT; local SRC
  local MNTUSER;

  local OPTION; local OPTARG; local OPTIND

  while getopts ':uno:' OPTION; do
    # echo $OPTION $OPTARG
    case "$OPTION" in
    
    u)
      MNTUSER=$OPTARG
      ;;  
    n)
      MNTUSER=_NONE_
    ;; 
    o)
      echo "adding sshfs option: $OPTARG"
      opts+=" -o $OPTARG"
      ;;    
    *)
      echo unknown sshfs option $OPTION
      ;;  
    esac
  done

  shift $((OPTIND - 1))

  SRC=$1
  MNT=$2
  shift 2

  if [[ ! $* =~ "--" ]]; then 
        ropts=$* 
      else 
        ropts=$(sed 's/\(.*\)--.*/\1/' <<< "$*") 
        sshopts=$(sed 's/.*--\(.*\)/\1/' <<< "$*") 
    fi

  host=$(sed 's/\(.*\):.*/\1/' <<<"$SRC")
  dir=$(sed 's/.*:\(.*\)/\1/' <<<"$SRC")

  [[ ! $host ]] && { echo no remote host given, aborting; return 4; }
  [[ ! $dir ]] && { echo no remote directory given, aborting; return 5; }

  module_load array
  declare -a ret
  echo $ropts
  scmd="ssh -r ${ropts} ${host}"
  String::split ret "$($scmd)" ,
  host=${ret[0]}; sshopts+=" ${ret[1]}"; local sshpass=${ret[2]}
  # echo "$host;$sshopts;$sshpass"
  # scmd="'$sshpass /usr/bin/ssh $sshopts'"
  # echo ssh command: "$scmd"
  # opts+=" $scmd"
  # remove_end_spaces "$scmd"
  # return
  
  # must remote spaces or sshfs fails
  opts+=" -o ssh_command=$(remove_end_spaces "'$sshpass /usr/bin/ssh $sshopts'")"
      
  # [[ ! $(host_reachable $host $(parse_option $sshopts -p)) ]] \
  # && echo host $host not reachable, aborting mount && return 1

  if [[ $(mounted $MNT) ]]; then
    echo "some remote already mounted at $MNT. Umount with: $ umount $MNT"
  else
    mkdir -p $MNT
    if [[ ! $MNTUSER == "_NONE_" ]]; then
    MNTUSER=${MNTUSER:-$USER}
    id=$(id -u ${MNTUSER})
    if [[ $id ]]; then
          opts+=" -o uid=$id -o allow_other -o idmap=user"
        else
        echo no user ${MNTUSER} on this machine, aborting mount
        return 1
       fi   
     else 
     MNTUSER=""  
     fi

  opts+=" -o follow_symlinks"

  cmd="sshfs $host:$dir $MNT $opts"
  echo $cmd
  eval $cmd
   if [[ $? -gt 0 ]]; then 
   echo "ERROR: unable to mount remote directory"
   echo "CMD=> $cmd"
   else
   [[ ! $MNTUSER == "_NONE_" ]] && MNTUSER=" as user $MNTUSER " || MNTUSER=""
   echo "mounted directory $dir from $(get_hostname_host $host)${MNTUSER}at $MNT" 
   fi
  fi
}

function usmount() {
  if [[ $(mounted $1) ]]; then
    echo "unmounting remote file system at $1"
    fusermount -u $1
  else
    echo "nothing mounted at $1, aborting unmount"
  fi
}

function mntBackup() {
  smount root@$1:/backup /backup/remote 
}

function umntBackup() {
  usmount /backup/remote
}

function enable_mounts() {
  
  DIRS=($BASH_SHELL_NETWORKS_LOADED "$BASH_SHELL_HOST" "$BASH_SHELL_USER_DIR" "$BASH_SHELL_DEV")
  # echo DIRS "${DIRS[@]}"
  CDIRS=()
  j=0
  cnt=${#DIRS[@]}
  for ((i = 0; i < cnt; i++)); do
    # echo $i of $cnt
    # looks in ssh/config subdirectory of each DIRS if not passed
    DIR="${DIRS[i]}/ssh/mounts"
    # echo ----- $i, ${DIRS[i]} trying $DIR
    [ -d $DIR ] && CDIRS[j]=$DIR
    j+=1 || echo no directory $DIR
  done
  # CDIRS=("${CDIRS[@]}")
  # echo ${CDIRS[@]}

  module_load file
 
  for CDIR in "${CDIRS[@]}"; do
  # echo $CDIR
    for f in $(_find -n '*.mnt' -p 'archive off' -d 0 $CDIR); do
      # echo "adding mounts file $f";
      [[ $f ]] && source "$f"
      done
  done

  [[ -f "$HOME/.ssh/mounts" ]] && source "$HOME/.ssh/mounts"

}