# 防止重复引入
if(GJDM_CGNS_ALREADY_INCLUDED)
	return()
endif()
set(GJDM_CGNS_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(CGNS_DIRS 
	NAMES 
		include/cgnslib.h 
	PATHS 
		${CMAKE_SOURCE_DIR}/extlib/CGNS 
	NO_SYSTEM_ENVIRONMENT_PATH
	NO_CMAKE_SYSTEM_PATH
)

set(CGNS_VERSION_MAJOR 4)
set(CGNS_VERSION_MINOR 3)
set(CGNS_VERSION_PATCH 0)

set(CGNS_VERSION "${CGNS_VERSION_MAJOR}.${CGNS_VERSION_MINOR}.${CGNS_VERSION_PATCH}")

find_path(CGNS_INCLUDE_DIRS
	NAMES
		cgnslib.h
	HINTS
		${CGNS_DIRS}/include
)

find_path(CGNS_LIBRARY_DIRS
	NAMES
		cgnsdll.lib libcgns.so
	HINTS
		${CGNS_DIRS}/lib
)

set(CGNS_LIBRARIES GJDM::CGNS)

add_library(GJDM::CGNS SHARED IMPORTED)
set_property(TARGET GJDM::CGNS PROPERTY INTERFACE_INCLUDE_DIRECTORIES ${CGNS_INCLUDE_DIRS})
set_property(TARGET GJDM::CGNS APPEND PROPERTY IMPORTED_CONFIGURATIONS RELEASE)
set_property(TARGET GJDM::CGNS PROPERTY INTERFACE_LINK_LIBRARIES GJDM::HDF5)

if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
	set_target_properties(GJDM::CGNS PROPERTIES
		IMPORTED_LOCATION_RELEASE "${CGNS_LIBRARY_DIRS}/libcgns.so.${CGNS_VERSION_MAJOR}.${CGNS_VERSION_MINOR}"
		IMPORTED_SONAME_RELEASE "libcgns.so"
	)
elseif(CMAKE_SYSTEM_NAME STREQUAL "Windows")
	set_target_properties(GJDM::CGNS PROPERTIES
		IMPORTED_IMPLIB_RELEASE "${CGNS_LIBRARY_DIRS}/cgnsdll.lib"
		IMPORTED_LOCATION_RELEASE "${CGNS_DIRS}/bin/cgnsdll.dll"
	)
endif()

include(FindPackageHandleStandardArgs)

# 如果找到所有需要的变量，并且版本匹配，则将CGNS_FOUND变量设置为TRUE
find_package_handle_standard_args(CGNS
	FOUND_VAR
		CGNS_FOUND
	REQUIRED_VARS
		CGNS_DIRS
		CGNS_INCLUDE_DIRS
		CGNS_LIBRARY_DIRS
		CGNS_LIBRARIES
	VERSION_VAR
		CGNS_VERSION
)