#!/bin/bash

# These are all default values
REMOTE_IN_SSHCONFIG=-1
REMOTE_USER="obsidianblk"
REMOTE_HOST="Trappist1"
REMOTE_PATH="/home/obsidianblk"
REMOTE_PORT=22
MOUNT_POINT="$HOME/remote"

PORT_VAR=""

NEXT_ARG_IS_FILE=-1
OP=""
SRC_FILE=""

URI=""

function usage() {
  echo "Usage: $0 [-o <path to mount options>] mount|unmount|remount"
}

function defineURI() {
  URI="$REMOTE_HOST:$REMOTE_PATH"
  if [ $REMOTE_IN_SSHCONFIG -lt 0 ]; then
    URI="$REMOTE_USER@$URI"
    PORT_VAR="-p $REMOTE_PORT"
  fi
}

if [[ "$#" -lt 1 ]]; then
  echo "Missing operation argument."
  usage
  exit 1
fi

for arg in "$@"; do
  if [ $NEXT_ARG_IS_FILE -ge 0 ]; then
    if [ -f "$arg" ]; then
      SRC_FILE="$arg"
      source "$arg"
      NEXT_ARG_IS_FILE=-1
    else
      echo "ERROR: Option file $arg  missing or invalid."
      usage
      exit 1
    fi
  else
    case "$arg" in
      mount) ;&
      unmount) ;&
      remount)
        if [ "$OP" != "" ]; then
          echo "ERROR: Multiple operations defined."
          usage
          exit 1
        fi
        OP="$arg"
        ;;
      -o)
        NEXT_ARG_IS_FILE=0
        ;;
    esac
  fi
done


if ! [[ -d "$MOUNT_POINT" ]]; then
  echo "ERROR: [$MOUNT_POINT] does not exist or is not a directory."
  usage
  exit 1
fi

case "$OP" in
  mount)
    defineURI
    if ! mount | grep "$URI on $MOUNT_POINT" > /dev/null
    then
      echo "Mounting $URI on $MOUNT_POINT... "
      sshfs -C $PORT_VAR -o reconnect,ServerAliveInterval=15,ServerAliveCountMax=3 $URI $MOUNT_POINT &&
      ( # Success
        echo "Mounted."
        notify-send -i server 'Successfully Mounted' "$URI" &> /dev/null
        exit 0
      ) ||
      ( # Failure
        echo "Mount Failed!"
        notify-send -i error 'Failed to mount' "$URI" &> /dev/null
        exit 1
      )
    else
      echo "Remote folder is already mounted."
      exit 1
    fi
    ;;

  unmount)
    defineURI
    echo "$URI"
    if mount | grep "$URI on $MOUNT_POINT" > /dev/null
    then
      echo "Unmounting $URI from $MOUNT_POINT... "
      fusermount -u $MOUNT_POINT &&
      ( # Success
        echo "Unmount Successful."
        notify-send -i server 'Successfully Unmounted' "$URI" &> /dev/null
        exit 0
      ) ||
      ( # Failure
        echo "FAILED to Unmount!"
        notify-send error 'Failed to unmount' "$URI" &> /dev/null
        exit 1
      )
    else
      echo "Remote folder not mounted."
      exit 1
    fi
    ;;

  remount)
    $SRC_ARG=""
    if $SRC_FILE != ""; then
      SRC_ARG="-o $SRC_FILE"
    fi
    $0 unmount $SRC_ARG $OP &&
    $0 mount $SRC_SRG $OP
    ;;

  *)
    usage 
    exit
    ;;
esac