# DetectOS.cmake

function(add_os_definitions target)
    # 初始化所有平台宏为 0
    set(PLATFORMS WINDOWS MACOS LINUX FREEBSD)

    # 检测操作系统并设置相应的宏为 1
    if(WIN32)
        target_compile_definitions(${target} PRIVATE WINDOWS=1)
        message(STATUS "Detected Windows operating system")
        list(REMOVE_ITEM PLATFORMS WINDOWS)
    elseif(APPLE)
        target_compile_definitions(${target} PRIVATE MACOS=1)
        message(STATUS "Detected macOS operating system")
        list(REMOVE_ITEM PLATFORMS MACOS)
    elseif(UNIX)
        if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
            target_compile_definitions(${target} PRIVATE LINUX=1)
            message(STATUS "Detected Linux operating system")
            list(REMOVE_ITEM PLATFORMS LINUX)
        elseif(${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD")
            target_compile_definitions(${target} PRIVATE FREEBSD=1)
            message(STATUS "Detected FreeBSD operating system")
            list(REMOVE_ITEM PLATFORMS FREEBSD)
        else()
            message(WARNING "Detected unknown Unix-like operating system")
        endif()
    else()
        message(WARNING "Unknown operating system")
    endif()

    foreach(PLATFORM ${PLATFORMS})
        target_compile_definitions(${target} PRIVATE ${PLATFORM}=0)
    endforeach()

    # 检测并设置架构宏
    if(CMAKE_SIZEOF_VOID_P EQUAL 8)
        target_compile_definitions(${target} PRIVATE ARCH_64BIT=1 ARCH_32BIT=0)
        message(STATUS "Detected 64-bit architecture")
    else()
        target_compile_definitions(${target} PRIVATE ARCH_64BIT=0 ARCH_32BIT=1)
        message(STATUS "Detected 32-bit architecture")
    endif()

    # 设置通用的 UNIX 宏
    if(UNIX)
        target_compile_definitions(${target} PRIVATE UNIX=1)
    else()
        target_compile_definitions(${target} PRIVATE UNIX=0)
    endif()

    # 设置通用的 POSIX 宏
    if(UNIX OR APPLE)
        target_compile_definitions(${target} PRIVATE POSIX=1)
    else()
        target_compile_definitions(${target} PRIVATE POSIX=0)
    endif()
endfunction()