# Check for the OpenNI2 library:
#  pkg-config if available (Linux), otherwise via 
# Originally based on: https://github.com/rgbdemo/nestk/blob/master/cmake/FindOpenNI2.cmake
# =========================================================
set(CMAKE_MRPT_HAS_OPENNI2 0)

option(DISABLE_OPENNI2 "Disable the OpenNI2 library, even if automatically found" "OFF")
mark_as_advanced(DISABLE_OPENNI2)

if (DISABLE_OPENNI2) # Allow the user to force not using this lib
	return()
endif()

if (PKG_CONFIG_FOUND)
	pkg_check_modules(PC_OPENNI QUIET libopenni2)
endif ()

# Build the expected names of the environment variables (Windows only) where OpenNI2 can be found:
if (CMAKE_MRPT_WORD_SIZE EQUAL 64)
	set(ENV_OPNI2_INCLUDE "OPENNI2_INCLUDE64")
	set(ENV_OPNI2_LIB     "OPENNI2_LIB64")
	set(ENV_OPNI2_REDIST  "OPENNI2_REDIST64")
else ()
	set(ENV_OPNI2_INCLUDE "OPENNI2_INCLUDE")
	set(ENV_OPNI2_LIB     "OPENNI2_LIB")
	set(ENV_OPNI2_REDIST  "OPENNI2_REDIST")
endif ()

# Create option for OpenNI2 and guess its default value: 
set(DEFAULT_MRPT_HAS_OPENNI2 0)
if(PC_OPENNI_FOUND OR NOT "$ENV{${ENV_OPNI2_INCLUDE}}" STREQUAL "")
	set(DEFAULT_MRPT_HAS_OPENNI2 1)
endif()

option(MRPT_HAS_OPENNI2 "Support for the OpenNI2 library" ${DEFAULT_MRPT_HAS_OPENNI2})

if(NOT MRPT_HAS_OPENNI2)
	return()
endif()

#add a hint so that it can find it without the pkg-config
find_path(OPENNI2_INCLUDE_DIR OpenNI.h
	HINTS ${PC_OPENNI_INCLUDEDIR} ${PC_OPENNI_INCLUDE_DIRS} /usr/include/openni2 /usr/include/ni2
		  PATHS "$ENV{PROGRAMFILES}/OpenNI2/Include" "$ENV{PROGRAMW6432}/OpenNI2/Include" "$ENV{${ENV_OPNI2_INCLUDE}}"
		  PATH_SUFFIXES openni ni
		  DOC "Path to the include directory containing OpenNI.h,etc.")
#add a hint so that it can find it without the pkg-config
find_library(OPENNI2_LIBRARY
	NAMES OpenNI2
			 HINTS ${PC_OPENNI_LIBDIR} ${PC_OPENNI_LIBRARY_DIRS} /usr/lib
			 PATHS "$ENV{PROGRAMFILES}/OpenNI2/Redist" "$ENV{PROGRAMW6432}/OpenNI2/Redist" "$ENV{PROGRAMW6432}/OpenNI2" "$ENV{${ENV_OPNI2_LIB}}"
			 PATH_SUFFIXES lib lib64
			 DOC "The OpenNI2.lib file path")

if (OPENNI2_INCLUDE_DIR AND OPENNI2_LIBRARY)
	set(CMAKE_MRPT_HAS_OPENNI2  1)
	set(CMAKE_MRPT_HAS_OPENNI2_SYSTEM  1)

	add_library(imp_openni2 INTERFACE IMPORTED)
	set_target_properties(imp_openni2
		PROPERTIES
		INTERFACE_INCLUDE_DIRECTORIES ${OPENNI2_INCLUDE_DIR}
		INTERFACE_LINK_LIBRARIES ${OPENNI2_LIBRARY}
		)

	set(MRPT_OPENNI2_LIBRARIES imp_openni2)

	if ($ENV{VERBOSE})
		message(STATUS "OpenNI2 found (include: ${OPENNI2_INCLUDE_DIR}, lib: ${OPENNI2_LIBRARY})")
	endif()
else()
	message(FATAL_ERROR "OpenNI2 not found: Either correctly set OPENNI2_INCLUDE_DIR and OPENNI2_LIBRARY or uncheck MRPT_HAS_OPENNI2")
endif()