#!/bin/bash

#bmount () {}
# sudo bindfs -o allow_other -o map=root/1001:@root/@1001  /var/lib/docker/volumes  /data/dvols


if [ -v PS1 ]; then
 alias drbu="dir_rebind_user"
 alias dbu="dir_bind_user"
 alias dbum="dir_bind_unmount"
fi

dir_rebind_user () {
  local usesudo; local dir;local user;local group
   # $1 new owner
   # $2 dir
 
[ $# -lt 2 ] && echo minimum args needed to rebind are user and directory  && return 1
[[ $EUID -ne 0 ]] && usesudo=sudo

[[ $(id -u $1 2> /dev/null) ]] || { echo user $1 does not exist can not continue; return 2; }

dir=$(realpath $2)
user=$(stat -c '%U' $dir)
group=$(stat -c '%G' $dir)
$usesudo bindfs --force-user=$1 --force-group=$1 --create-for-user=$user --create-for-group=$group --chown-ignore --chgrp-ignore $dir $dir
# echo use \'dir_rebind_user_remove $dir\' to remove
}

dir_bind_unmount () {
   local usersudo
   [[ $EUID -ne 0 ]] && usesudo=sudo
   $usesudo fusermount -u $1
}


dir_bind_user () {
  local usesudo; local dir;local user;local group;local mp
 
[ $# -lt 3 ] && echo minimum 3 args needed to rebind are user, source directory and mountpoint  && return 1
[[ $EUID -ne 0 ]] && usesudo=sudo

[[ $(id -u $1 2> /dev/null) ]] || { echo user $1 does not exist can not continue; return 2; }

dir=$(realpath $2)
mp=$3
if ! $usesudo mkdir -p $mp; then echo unable to make mountpoint aborting; return 2; fi
$usesudo chown $1:$1 $mp
user=$(stat -c '%U' $dir)
group=$(stat -c '%G' $dir)
$usesudo bindfs --force-user=$1 --force-group=$1 --create-for-user=$user --create-for-group=$group --chown-ignore --chgrp-ignore $dir $mp
# echo use \'dir_rebind_user_remove $dir\' to remove
}

# module_load bindfs && dir_bind_user david /mnt/datadrive/@images /data/images


(return 0 2>/dev/null) || dir_bind_user $@


# function bumount {
#   echo "removing bind mount at $1"
#   notify-send "removing bind mount at ${1}" --icon=dialog-information -t 2000
#   fusermount -u "$1"
# }

# function bmount {
#   if [ "$1" == "-d" ]; then
#     bumount $2
#   else
    # if [[ " ${array[@]} " =~ " ${value} " ]]; then
    # # whatever you want to do when array contains value
    # fi
    # mp="${@: -2}"
#     echo mounting  $@ 
#     bindfs $@
#   fi
# }

# must have fuser and bindfs installed
# for use by sudoers 
# ln -s $BASH_SHELL_HOST/all/modules/bind-mount/bind-mount.sh /opt/bin/bmount
# function xxbmount () {
#   if [ "$1" == "-mp" ]; then
#     MOUNTED=$(mountpoint "$2" | grep not)
#       if [ -z "$MOUNTED" ]; then
#        echo $2 is a mount point so bind mounting $2/$3 to $4
#       notify-send "bind mounting ${2}/${3} to ${4}" --icon=dialog-information -t 2000
#        bindfs "$2/$3" "$4"
#       else
#         notify-send "${2} not a mount point - Unable to bind mount ${2}/${3} to ${4}" --icon=dialog-error -t 2000
#       fi
#   else
#     echo bind mounting  $1 to $2
#     notify-send "bind mounting ${1} to ${2}" --icon=dialog-information -t 2000
#     bindfs "$1" "$2"
#   fi
# }