@echo off

reg.exe query "HKLMSOFTWAREMicrosoftMSBuildToolsVersions14.0" /v MSBuildToolsPath > nul 2>&1
if ERRORLEVEL 1 goto MissingMSBuildRegistry

for /f "skip=2 tokens=2,*" %%A in ('reg.exe query "HKLMSOFTWAREMicrosoftMSBuildToolsVersions14.0" /v MSBuildToolsPath') do SET "MSBUILDDIR=%%B"

echo.
echo MSBuildToolsPath: %MSBUILDDIR%
echo.

IF NOT EXIST "%MSBUILDDIR%" goto MissingMSBuildToolsPath
IF NOT EXIST "%MSBUILDDIR%msbuild.exe" goto MissingMSBuildExe
IF EXIST "%MSBUILDDIR%Microsoft.Common.targets.bak" goto AlreadyPatched


::-------------------------------------
REM  --> Check for permissions
>nul 2>&1 "%SYSTEMROOT%system32cacls.exe" "%SYSTEMROOT%system32configsystem"

REM --> If error flag set, we do not have admin.
if '%errorlevel%' NEQ '0' (
    echo Requesting administrative privileges...
    goto UACPrompt
) else ( goto gotAdmin )

:UACPrompt
    echo Set UAC = CreateObject^("Shell.Application"^) > "%temp%getadmin.vbs"
    echo UAC.ShellExecute "%~s0", "", "", "runas", 1 >> "%temp%getadmin.vbs"

    "%temp%getadmin.vbs"
    exit /B

:gotAdmin
    if exist "%temp%getadmin.vbs" ( del "%temp%getadmin.vbs" )
    pushd "%CD%"
    CD /D "%~dp0"
::--------------------------------------


:: Replace MSBuild 14.0 Microsoft.Common.targets file with MSBuild 15.0 file.
rename "%MSBUILDDIR%Microsoft.Common.targets" "Microsoft.Common.targets.bak"
copy "MSBuil15.Microsoft.Common.targets" "%MSBUILDDIR%Microsoft.Common.targets"


exit /b 0

goto:eof
::ERRORS
::---------------------
:MissingMSBuildRegistry
echo Cannot obtain path to MSBuild tools from registry
goto:eof
:MissingMSBuildToolsPath
echo The MSBuild tools path from the registry '%MSBUILDDIR%' does not exist
goto:eof
:MissingMSBuildExe
echo The MSBuild executable could not be found at '%MSBUILDDIR%'
goto:eof
:AlreadyPatched
echo The Microsoft.Common.targets file is already patched
goto:eof