@echo off
setlocal enabledelayedexpansion

:: Initialize variables
set "source_file="
set "dry_run=false"
set "use_list=false"
set "list_file="
set "output_files="

:: Check if no arguments provided
if "%~1"=="" (
    echo Usage: duplicatefile ^<source_file^> [-dry] [-list] ^<out_file1^> .. ^<out_filen^>
    echo.
    echo Options:
    echo   -dry    : Dry run - show what would be copied without actually copying
    echo   -list   : Use first output file as a list file containing target filenames
    echo.
    echo Examples:
    echo   duplicatefile source.txt file1.txt file2.txt file3.txt
    echo   duplicatefile source.txt -dry file1.txt file2.txt
    echo   duplicatefile source.txt -list filelist.txt
    exit /b 1
)

:: Parse command line arguments
set "arg_index=0"
for %%a in (%*) do (
    set /a arg_index+=1
    
    if !arg_index! equ 1 (
        set "source_file=%%~a"
    ) else if "%%~a"=="-dry" (
        set "dry_run=true"
    ) else if "%%~a"=="-list" (
        set "use_list=true"
    ) else (
        if "!use_list!"=="true" and "!list_file!"=="" (
            set "list_file=%%~a"
        ) else (
            set "output_files=!output_files! %%~a"
        )
    )
)

:: Validate source file
if "!source_file!"=="" (
    echo Error: Source file not specified
    exit /b 1
)

if not exist "!source_file!" (
    echo Error: Source file "!source_file!" does not exist
    exit /b 1
)

:: Display operation mode
if "!dry_run!"=="true" (
    echo [DRY RUN MODE] - No files will be copied
    echo.
)

echo Source file: !source_file!
echo.

:: Handle list mode
if "!use_list!"=="true" (
    if "!list_file!"=="" (
        echo Error: List file not specified when using -list option
        exit /b 1
    )
    
    if not exist "!list_file!" (
        echo Error: List file "!list_file!" does not exist
        exit /b 1
    )
    
    echo Reading target files from list: !list_file!
    echo.
    
    for /f "usebackq delims=" %%f in ("!list_file!") do (
        set "target_file=%%f"
        
        :: Skip empty lines
        if not "!target_file!"=="" (
            call :copy_file "!source_file!" "!target_file!" "!dry_run!"
        )
    )
) else (
    :: Handle direct file list mode
    if "!output_files!"=="" (
        echo Error: No output files specified
        exit /b 1
    )
    
    echo Target files: !output_files!
    echo.
    
    for %%f in (!output_files!) do (
        call :copy_file "!source_file!" "%%f" "!dry_run!"
    )
)

echo.
echo Operation completed.
exit /b 0

:: Subroutine to copy a file
:copy_file
set "src=%~1"
set "dst=%~2"
set "is_dry=%~3"

if "%is_dry%"=="true" (
    echo [DRY RUN] Would copy: "%src%" -^> "%dst%"
) else (
    echo Copying: "%src%" -^> "%dst%"
    
    :: Create directory if it doesn't exist
    for %%d in ("%dst%") do (
        if not exist "%%~dpd" (
            mkdir "%%~dpd" 2>nul
        )
    )
    
    :: Copy the file
    copy "%src%" "%dst%" >nul 2>&1
    if !errorlevel! equ 0 (
        echo   Success
    ) else (
        echo   Error: Failed to copy file
    )
)
goto :eof