# 防止重复引入
if(Gmsh_ALREADY_INCLUDED)
	return()
endif()
set(Gmsh_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(Gmsh_DIRS 
	NAMES 
		include/gmsh.h
	PATHS 
		${CMAKE_SOURCE_DIR}/extlib/Gmsh 
	NO_SYSTEM_ENVIRONMENT_PATH
	NO_CMAKE_SYSTEM_PATH
)

set(Gmsh_VERSION_MAJOR 4)
set(Gmsh_VERSION_MINOR 11)
set(Gmsh_VERSION_PATCH 1)

set(Gmsh_VERSION "${Gmsh_VERSION_MAJOR}.${Gmsh_VERSION_MINOR}.${Gmsh_VERSION_PATCH}")

find_path(Gmsh_INCLUDE_DIRS
	NAMES
		gmsh.h
	HINTS
		${Gmsh_DIRS}/include
)

find_path(Gmsh_LIBRARY_DIRS
	NAMES
		gmsh.lib
	HINTS
		${Gmsh_DIRS}/bin
)

find_path(Gmsh_BINARY_DIRS
	NAMES
		gmsh-4.12.dll
	HINTS
		${Gmsh_DIRS}/bin
)

set(Gmsh_LIBRARIES GJDM::Gmsh)
add_library(GJDM::Gmsh SHARED IMPORTED)
set_property(TARGET GJDM::Gmsh PROPERTY INTERFACE_INCLUDE_DIRECTORIES ${Gmsh_INCLUDE_DIRS})
set_property(TARGET GJDM::Gmsh APPEND PROPERTY IMPORTED_CONFIGURATIONS RELEASE)
set_property(TARGET GJDM::Gmsh APPEND PROPERTY IMPORTED_CONFIGURATIONS DEBUG)
set_target_properties(GJDM::Gmsh PROPERTIES
                IMPORTED_IMPLIB_DEBUG  "${Gmsh_DIRS}/bin/gmsh.lib"
                IMPORTED_LOCATION_DEBUG  "${Gmsh_DIRS}/bin/gmsh-4.12.dll"
		IMPORTED_IMPLIB_RELEASE  "${Gmsh_DIRS}/bin/gmsh.lib"
		IMPORTED_LOCATION_RELEASE  "${Gmsh_DIRS}/bin/gmsh-4.12.dll"
	)

# if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
# 	set(Gmsh_EXECUTABLE "${Gmsh_DIRS}/bin/gmsh.exe")
# else()
# 	set(Gmsh_EXECUTABLE "${Gmsh_DIRS}/bin/gmsh")
# endif()

include(FindPackageHandleStandardArgs)

# 如果找到所有需要的变量，并且版本匹配，则将Gmsh_FOUND变量设置为TRUE
find_package_handle_standard_args(Gmsh
	FOUND_VAR
		Gmsh_FOUND
	REQUIRED_VARS
		Gmsh_DIRS
		Gmsh_INCLUDE_DIRS
		Gmsh_BINARY_DIRS
		Gmsh_LIBRARY_DIRS
		# Gmsh_EXECUTABLE
		Gmsh_LIBRARIES
	VERSION_VAR
		Gmsh_VERSION
)