@echo off

SETLOCAL EnableExtensions EnableDelayedExpansion

REM change to directory of dragged files
pushd "%~dp1"

REM Include paths for external programs
set path="F:\Utilities\commandlinetools\Mp3wrap";%path%
set path="F:\Utilities\commandlinetools\id3";%path%
set path="F:\Utilities\MP3Val";%path%

REM mergeMP3_cects.bat
REM Place this file anywhere and drag and drop two or more mp3 files to merge them
	
REM ------------------ Version History ----------------------------------
REM Add new line for updated versions, keep previous for record
REM         XX.XXX      YYYY-MM-DD 		Author 		 Description
SET version=01.000      2015-03-13      cects.com    initial version
SET version=01.001  	2015-03-14      cects.com    blog version


REM -------------------------- Set title --------------------------------
REM note: "%~nx0" = filename of the batch file
SET title=%~nx0 - version %version%
TITLE %title%

 
REM Optional - use to check for an argument or drag and drop. Change the 
REM code below as required
REM if "%1" == "" call :xxx & exit /b 1
 
 
REM ----------------------------- Program Code --------------------------
echo Current working directory (%%CD%%): %CD%
echo Directory of this script (%%~dp0): %~dp0 

:main
goto begin

REM check to see if this file was executed without dragging a file to it
:begin
if [%1]==[] (
echo.
echo "no files dragged to this file. Try again."
echo.
echo "press any key to exit ...."
echo.
pause >nul
goto end
) else (
rem set variable file1. This will be used for tagging the merged file
set file1=%~nx1
)

call:theorder %*
call:ask %*
rem call:processmp3win %*
rem call:processmp3 %*
call:metadatafix
call:mp3validate
call:renamefile

goto done

REM ----------------------------- Program Code End ----------------------

:done
echo.
echo "Files joined successfully"
echo.

echo.
call:errorfunc
echo.


REM Note: Endlocal causes Title to not display on exit, but 
REM countdown will display
Endlocal


REM ---------------------- Delayed Exit ------------------------------------
REM Sets exit code to 0
echo exiting in 15 seconds..........&echo.
echo hit PAUSE on keyboard to pause... any key will resume exit
FOR /l %%a in (15,-1,1) do (TITLE %title% -- closing in %%as&ping -n 2 -w 1 127.0.0.1>NUL)
Title Press any key to exit . . .&echo.&EXIT


REM --------------------- Function Section -----------------------------------
:errorfunc
echo The exit error code is: %ERRORLEVEL%
goto :eof

:theorder
echo.
echo Files will be processed in this order:
echo.
for %%z in (%*) do (
echo %%z
)
echo.
rem echo Press any key to continue merging files, or close window to start over ....
rem pause >nul
goto :eof

REM Use Setlocal Endlocal for function so file1 can be used to rename file
:processmp3win
SETLOCAL
set index=1
for %%t in (%*) do (
rem echo %%t
set file!index!=%%t
if not !file1!==%%t (
set file1=!file1!+%%t
)
set /A index+=1
)
echo.
echo Combined mp3file:
echo !file1!
echo.
echo copying the following files to "temp_MP3WRAP.mp3"
copy /b !file1! "temp_MP3WRAP.mp3"
echo.
Endlocal
goto :eof

:processmp3
REM merge dragged and dropped files with mp3wrap
echo.
mp3wrap temp.mp3 %*
echo.
echo "Merge complete"
echo.
echo.
goto:eof

:metadatafix
REM copy tags from first file to merged file with id3
rem id3.exe -D %file1% -1 -2 "temp_MP3WRAP.mp3"
id3.exe -D %file1% "temp_MP3WRAP.mp3"
echo.
echo "Metadata copied"
echo.
echo.
echo.
goto:eof

:mp3validate
REM fix errors of merged file with mp3val
mp3val temp_MP3WRAP.mp3 -f -nb -si
echo.
echo "Errors repaired"
echo.
goto:eof

:renamefile
set name="%file1:~0,-4%_merged.mp3" 
ren "*MP3WRAP.mp3" %name%
echo "Temp file renamed to %name%"
goto:eof

:ask
set INPUT=
set /p INPUT=Process files with Windows (W) or with MP3Wrap (M):
if not defined INPUT goto ask
if /i "%INPUT:"=%"=="w" call:processmp3win %* && goto :eof
if /i "%INPUT:"=%"=="m" call:processmp3 %* && goto :eof
echo Incorrect input, try again & goto ask
goto :eof

REM --------------------------- exit -----------------------------------------
:end
EXIT