Renaming files using a list of names in a txt or csv file

Question

Hello everyone,
I'm trying to use AppleScript (although I'm a total noob to it) to rename the files in a folder (if possible using something like this - set folder to choose folder) to coincide to a list of names (in a txt or csv - can be any extension needed).
To paint the picture clearer I'll have something like this
Files_as_they_are
Files_renamed
01.mkv
Valar Dohaeris.mkv
02.mkv
Mhysa.mkv
Here is what I've tryed so far : (some point through the night I've tryed to repeat part of the process thus the "fcount" but the result was even worse)
set theFolder to choose folder
set ep to {"Valar Dohaeris", "Dark Wings, Dark Words"}
set fcount to 1
tell application "Finder"
  set name of file fcount of theFolder to item fcount of ep
end tell
set fcount to fcount + 1
Tnx in advance...

Answer 1

This will work with a comma separated text file,
i.e.:
     Files as the are, Files Renamed
     01.mkv, Valar Dohaeris.mkv
     02.mkv, Mhysa.mkv
Note that if the file to be renamed exists, it will be overwritten (A test can be added to skip if exists if needed)
set theFoler to POSIX path of (choose folder with prompt "Choose folder with Files" default location path to desktop)
set theFile to POSIX path of (choose file with prompt "Choose TXT file" default location path to desktop)
do shell script "
cd " & quoted form of theFoler & "
while read line  
do  
     OldImageName=${line%,*}
     NewImageName=${line#*,}
     if [ -e \"$OldImageName\" ] ; then
          mv \"$OldImageName\" \"$NewImageName\"
     else
          echo \"$OldImageName\" >> ~/Desktop/Errors.txt
     fi
done < " & quoted form of theFile & "