#!/bin/bash

filename=""

if [[ ! -f ~/.trash.log ]]
then
  echo "No files in trash"
  exit
fi

if [[ $# -ne 1 ]]
then
  echo "Expected one param: name of file to restore"
  echo "Name of file to restore: "
  read filename
else
  filename=$1
fi

while true
do
  if [[ "$filename" == *\0* || "$filename" == *\/* ]]
  then
    echo "Wrong filename"
    echo "Name of file to restore: "
    read filename
    continue
  fi

  linkname=""
  file_untrash=""

  exec 3<&0

  line_counter=0
  while read line
  do
    line_counter=$((line_counter+1))
    current_linkname=$(echo $line | awk '{print $NF}')
    current_filename=${line% $current_linkname}

    if [[ $current_filename == */$filename ]]
    then
      echo "Do you want to restore this file: " $current_filename "? Print Y/N or another to exit"
      read answer <&3
      case $answer in
      "Y")
        file_untrash=$current_filename
        linkname=$current_linkname
        break
        ;;
      "N") continue ;;
      *) exit ;;
      esac
    fi
  done < ~/.trash.log

  if [[ $file_untrash == "" || ! -f ~/.trash/$linkname ]]
  then
    echo "No files to restore found"
    echo "Name of file to restore: "
    read filename
    continue
  fi

  file_dir=${file_untrash%$filename}
  if [[ -d "$file_dir" ]]
  then
    if [[ -f "$file_untrash" ]]
    then
      echo "File with such a name already exists"
      echo "Name of file to restore: "
      read filename
      continue
    fi
    echo "Restored file in original directory"
    ln ~/.trash/"$linkname" "$file_untrash"
  else
    echo "Original directory does not exist. Restoring file in home directory"
    if [[ -f ~/"$filename" ]]
    then
      echo "File with such a name already exists"
      echo "Name of file to restore: "
      read filename
      continue
    fi
    echo "Restored file in home directory"
    ln ~/.trash/"$linkname" ~/"$filename"
  fi

  rm ~/.trash/"$linkname"
  sed -i "${line_counter}d" ~/.trash.log
  break
done