@echo off
setlocal enabledelayedexpansion

:: Parse command line arguments
set "TARGET_DIR=%~1"
set "KEEP_FILES=%~2"

:: Use current directory if TARGET_DIR not provided
if "%TARGET_DIR%"=="" set "TARGET_DIR=%CD%"

:: Default keep files if not provided
if "%KEEP_FILES%"=="" set "KEEP_FILES=*.log *.cfg"

:: Display usage if help requested
if "%~1"=="-h" goto :usage
if "%~1"=="--help" goto :usage
if "%~1"=="/?" goto :usage

:: Confirm the operation
echo WARNING: This will delete all files in "%TARGET_DIR%" and subdirectories
echo EXCEPT files matching these patterns: %KEEP_FILES%
echo.
set /p confirm="Are you sure? (Y/N): "
if /i not "%confirm%"=="Y" (
    echo Operation cancelled.
    exit /b
)

:: Change to target directory
cd /d "%TARGET_DIR%" 2>nul
if errorlevel 1 (
    echo ERROR: Cannot access directory "%TARGET_DIR%"
    pause
    exit /b 1
)

echo.
echo Processing files in: %TARGET_DIR%
echo Keep patterns: %KEEP_FILES%
echo.

:: Process all files recursively
for /r %%f in (*) do call :ProcessFile "%%f"

echo.
echo Operation completed!
pause
exit /b

:: Subroutine to process individual file
:ProcessFile
setlocal enabledelayedexpansion
set "filepath=%~1"
set "filename=%~nx1"
set "skip=0"

:: Check if current file matches any keep pattern
for %%k in (%KEEP_FILES%) do (
    if /i "%filename%"=="%%k" (
        set "skip=1"
        goto :skipcheck
    )
)

:: Check wildcard patterns
if %skip%==0 (
    for %%k in (%KEEP_FILES%) do (
        set "pattern=%%k"
        set "matched=0"
        
        :: Check if pattern contains wildcards
        echo !pattern! | findstr /C:"*" >nul 2>&1
        if !errorlevel!==0 set "has_wildcard=1"
        if not defined has_wildcard (
            echo !pattern! | findstr /C:"?" >nul 2>&1
            if !errorlevel!==0 set "has_wildcard=1"
        )
        
        if defined has_wildcard (
            :: Simple wildcard matching - if pattern is *.jpg, check if filename ends with .jpg
            if "!pattern:~0,1!"=="*" (
                set "extension=!pattern:~1!"
                if /i "!filename:~-4!"=="!extension!" (
                    set "skip=1"
                    goto :skipcheck
                )
            )
        )
    )
)

:skipcheck
:: Delete if not in keep list
if %skip%==0 (
    echo Deleting: %filepath%
    del "%filepath%" 2>nul
    if errorlevel 1 echo WARNING: Could not delete %filepath%
) else (
    echo Keeping: %filepath%
)
endlocal
exit /b
exit /b

:usage
echo.
echo Selective File Deletion Script
echo Usage: %~nx0 [TARGET_DIR] [KEEP_FILES]
echo.
echo Arguments:
echo   TARGET_DIR   - Directory to process (default: current directory)
echo   KEEP_FILES   - Space-separated patterns of files to keep (supports wildcards)
echo.
echo Examples:
echo   %~nx0                                    - Delete all files in current dir except *.log *.cfg
echo   %~nx0 "C:\MyFolder"                      - Delete all files in C:\MyFolder except *.log *.cfg
echo   %~nx0 "C:\MyFolder" "*.txt *.ini"        - Keep only .txt and .ini files
echo   %~nx0 "." "important.* *.log config.?"   - Keep files matching these patterns
echo.
echo Wildcard patterns supported:
echo   *     - Matches any number of characters
echo   ?     - Matches single character
echo.
exit /b