@echo off
setlocal EnableDelayedExpansion
title Trend Chart Launcher
set "APP_DIR=%~dp0"
set "APP_EXE=%APP_DIR%ChartAnalysis.exe"

if not exist "%APP_EXE%" (
    echo [ERROR] ChartAnalysis.exe not found in this folder.
    pause
    exit /b 1
)

echo Checking .NET Framework version...

set "RELHEX="
for /f "tokens=3" %%v in ('reg query "HKLM\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full" /v Release 2^>nul') do set "RELHEX=%%v"

if defined RELHEX (
    set /a RELDEC=RELHEX 2>nul
    if defined RELDEC (
        if !RELDEC! GEQ 394806 (
            echo [OK] .NET Framework 4.6.2+ detected. Starting program...
            start "" "%APP_EXE%"
            exit /b 0
        )
    )
)

echo.
echo [INFO] .NET Framework 4.6.2 or higher is required.
echo        This launcher will download and install .NET Framework 4.8
echo        (supports Windows 7 SP1 to Windows 11), then start the program.
echo.
echo Downloading .NET Framework 4.8 (about 120MB)...
set "DOTNET_URL=https://go.microsoft.com/fwlink/?linkid=2088631"
set "INSTALLER=%TEMP%\dotnetfx48_setup.exe"

powershell -NoProfile -ExecutionPolicy Bypass -Command ^
  "$ErrorActionPreference='Stop'; [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; $wc = New-Object System.Net.WebClient; $wc.DownloadFile('%DOTNET_URL%','%INSTALLER%')"

if not exist "%INSTALLER%" (
    echo.
    echo [FAILED] Download failed. Please install manually:
    echo        https://dotnet.microsoft.com/download/dotnet-framework/net48
    echo        Then run Start.bat again.
    start "" "https://dotnet.microsoft.com/download/dotnet-framework/net48"
    pause
    exit /b 1
)

echo Installing .NET Framework 4.8 silently, please wait...
"%INSTALLER%" /q /norestart
set "RC=%ERRORLEVEL%"

if %RC% NEQ 0 (
    echo.
    echo [WARN] Installer returned code %RC% (0 = success).
    if %RC% EQU 3010 (
        echo Reboot required. Please restart the computer, then run Start.bat again.
        pause
        exit /b 1
    )
    echo Installation may have failed. Please retry after reboot.
    pause
    exit /b 1
)

echo.
echo [DONE] .NET Framework ready. Starting program...
start "" "%APP_EXE%"
exit /b 0