@echo off
setlocal enabledelayedexpansion

:: ============================================================================
:: build.bat - Build script with compiler preference: clang-cl > gcc > clang
:: Usage: build [Release|Debug] [clean]
:: ============================================================================

set BUILD_TYPE=Release
set CLEAN_BUILD=0

:: Parse arguments
:parse_args
if "%~1"=="" goto :main

if /i "%~1"=="Release" (
    set BUILD_TYPE=Release
    shift
    goto :parse_args
)
if /i "%~1"=="Debug" (
    set BUILD_TYPE=Debug
    shift
    goto :parse_args
)
if /i "%~1"=="clean" (
    set CLEAN_BUILD=1
    shift
    goto :parse_args
)

:: Unknown argument fallback (the *)
echo Unknown argument: %~1
echo Usage: .\%~nx0 [Release^|Debug] [clean]
exit /b 1

:main
set BUILD_DIR=build\windows\%BUILD_TYPE%
echo === Building filehasher (%BUILD_TYPE%) ===

:: Clean if requested
if %CLEAN_BUILD%==1 (
    echo Cleaning...
    if exist "%BUILD_DIR%" rmdir /s /q "%BUILD_DIR%" 2>nul
)

:: Create build dir
if not exist "%BUILD_DIR%" mkdir "%BUILD_DIR%"
pushd "%BUILD_DIR%"

:: Find compiler in preferred order
set CC=
where clang-cl >nul 2>&1
if !ERRORLEVEL! equ 0 (
    echo Compiler: clang-cl ^(preferred^)
    set "CC=-DCMAKE_C_COMPILER=clang-cl"
    goto :find_generator
)

where gcc >nul 2>&1
if !ERRORLEVEL! equ 0 (
    echo Compiler: gcc ^(fallback^)
    set "CC=-DCMAKE_C_COMPILER=gcc"
    goto :find_generator
)

where clang >nul 2>&1
if !ERRORLEVEL! equ 0 (
    echo Compiler: clang ^(last resort^)
    set "CC=-DCMAKE_C_COMPILER=clang"
    goto :find_generator
)

echo ERROR: No suitable compiler found! (clang-cl, gcc, or clang required)
popd
exit /b 1

:find_generator
:: Find Ninja for build system
set GEN=
where ninja >nul 2>&1
if !ERRORLEVEL! equ 0 (
    echo Generator: Ninja
    set "GEN=-G Ninja"
) else (
    echo Generator: Default
)

:: Configure
echo.
echo Configuring CMake...
set CMD=cmake ../../.. %GEN% %CC% -DCMAKE_BUILD_TYPE=%BUILD_TYPE% -DCMAKE_EXPORT_COMPILE_COMMANDS=ON
echo !CMD!
!CMD!
if !ERRORLEVEL! neq 0 (echo ERROR: Configuration failed & popd & exit /b 1)

:: Build
echo.
echo Building...
cmake --build . --config %BUILD_TYPE%
if !ERRORLEVEL! neq 0 (echo ERROR: Build failed & popd & exit /b 1)

:: Check if compile_commands.json exists in the current build directory
if exist "compile_commands.json" (
    echo.
    echo   clangd: compile_commands.json generated
    
    :: Copy from current build dir up two levels to the project root
    copy /Y "compile_commands.json" "..\..\..\compile_commands.json" >nul 2>&1
    if !ERRORLEVEL! equ 0 (
        echo   clangd: Copied to project root
    ) else (
        echo   clangd: Could not copy to project root
    )
)

popd
echo.
echo === Build Complete ===
echo Executable: %BUILD_DIR%\filehasher.exe