# 防止重复引用
if(CFD_ALREADY_INCLUDED)
  return()
endif()
set(CFD_ALREADY_INCLUDED 1)

# find_path 搜索包含某个文件的路径
# 如果在某个路径下发现了该文件，该结果会被存储到该变量中；如果没有找到，存储的结果将会是<VAR>-NOTFOUND
find_path(CFD_DIRS
    NAMES
        DUBHE.exe
    PATHS
        ${CMAKE_SOURCE_DIR}/extlib/CFD 
    NO_SYSTEM_ENVIRONMENT_PATH
    NO_CMAKE_SYSTEM_PATH
)

# CFD版本号设置
set(CFD_VERSION_MAJOR 1)
set(CFD_VERSION_MINOR 0)
set(CFD_VERSION_PATCH 0)
set(CFD_VERSION "${CFD_VERSION_MAJOR}.${CFD_VERSION_MINOR}.${CFD_VERSION_PATCH}")

if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
    set(CFD_EXECUTABLE "${CFD_DIRS}/DUBHE.exe")
endif()

include(FindPackageHandleStandardArgs)

# 如果找到所有需要的变量，并且版本匹配，则将CFD_FOUND变量设置为TRUE
find_package_handle_standard_args(CFD
    FOUND_VAR
        CFD_FOUND
    REQUIRED_VARS
        CFD_DIRS
        CFD_EXECUTABLE
    VERSION_VAR
        CFD_VERSION
)