@echo off
setlocal enabledelayedexpansion

REM =================================================================
REM Stage 1: Bootstrap Compiler (using MSVC as host compiler)
REM =================================================================
REM Builds basic Clang + LLD without runtime libraries
REM =================================================================

echo ================================================================
echo Stage 1: Building Bootstrap Compiler
echo ================================================================

REM =============== CONFIGURATION ===============
set LLVM_SOURCE_DIR=E:\llvm-project-llvmorg-22.1.5
set BUILD_DIR=E:\llvm-build-stage1
set INSTALL_DIR=E:\llvm-stage1
set PARALLEL_JOBS=3
set CMAKE_GENERATOR=Ninja
REM ==============================================

echo.
echo Configuration:
echo   Source:     %LLVM_SOURCE_DIR%
echo   Build:      %BUILD_DIR%
echo   Install:    %INSTALL_DIR%
echo   Generator:  %CMAKE_GENERATOR%
echo   Jobs:       %PARALLEL_JOBS%
echo.

REM Check if source directory exists
if not exist "%LLVM_SOURCE_DIR%\llvm\CMakeLists.txt" (
    echo ERROR: Source directory not found or invalid!
    echo Please set LLVM_SOURCE_DIR to your llvm-project directory
    exit /b 1
)

REM Clean previous build if exists
if exist "%BUILD_DIR%" (
    echo Removing previous build directory...
    rmdir /s /q "%BUILD_DIR%"
)

REM Create directories
mkdir "%BUILD_DIR%"
mkdir "%INSTALL_DIR%"

REM Navigate to build directory
cd /d "%BUILD_DIR%"

echo.
echo ================================================================
echo Configuring with CMake...
echo ================================================================

REM Configure with CMake
cmake -G "%CMAKE_GENERATOR%" ^
  -DCMAKE_BUILD_TYPE=Release ^
  -DCMAKE_INSTALL_PREFIX="%INSTALL_DIR%" ^
  -DLLVM_TARGETS_TO_BUILD="X86" ^
  -DLLVM_ENABLE_PROJECTS="clang;lld" ^
  -DLLVM_ENABLE_RUNTIMES="" ^
  -DLLVM_INCLUDE_TESTS=OFF ^
  -DLLVM_INCLUDE_EXAMPLES=OFF ^
  -DLLVM_INCLUDE_UTILS=OFF ^
  -DLLVM_INSTALL_TOOLCHAIN_ONLY=OFF ^
  -DLLVM_BUILD_TOOLS=ON ^
  "%LLVM_SOURCE_DIR%\llvm"

if errorlevel 1 (
    echo ERROR: CMake configuration failed!
    exit /b 1
)

echo.
echo ================================================================
echo Building...
echo ================================================================

REM Build and install
cmake --build . --config Release --target install --parallel %PARALLEL_JOBS%

if errorlevel 1 (
    echo ERROR: Build failed!
    exit /b 1
)

echo.
echo ================================================================
echo Verifying stage1 compiler...
echo ================================================================

REM Verify the compiler works
"%INSTALL_DIR%\bin\clang++.exe" --version > nul
if errorlevel 1 (
    echo ERROR: Built compiler doesn't work!
    exit /b 1
)

"%INSTALL_DIR%\bin\clang++.exe" --version
echo.
echo Stage 1 completed successfully!
echo Bootstrap compiler installed to: %INSTALL_DIR%
echo.
echo You can now run build-stage2.bat to build the complete toolchain.
echo ================================================================