add_subdirectory(build/hidapi)
add_subdirectory(build/tinkerforge)

if(ENABLE_WS281XPWM)
	add_library(ws281x
		external/rpi_ws281x/mailbox.c external/rpi_ws281x/ws2811.c
		external/rpi_ws281x/pwm.c external/rpi_ws281x/dma.c
		external/rpi_ws281x/rpihw.c)
endif()

set(USE_SYSTEM_PROTO_LIBS ${DEFAULT_USE_SYSTEM_PROTO_LIBS} CACHE BOOL "use protobuf library from system")

if (USE_SYSTEM_PROTO_LIBS)
	find_package(Protobuf REQUIRED)
	include_directories(${PROTOBUF_INCLUDE_DIRS})
else ()
	set(BUILD_SHARED_LIBS OFF CACHE BOOL "Build shared protobuf library")
	add_subdirectory(external/protobuf)

	if(CMAKE_CROSSCOMPILING)
		# when crosscompiling import the protoc executable targets from a file generated by a native build
		option(IMPORT_PROTOC "Protoc export file (protoc_export.cmake) from a native build" "IMPORT_PROTOC-FILE_NOT_FOUND")
		include(${IMPORT_PROTOC})
	else()
		# export the protoc compiler so it can be used when cross compiling
		export(TARGETS protoc_compiler FILE "${CMAKE_BINARY_DIR}/protoc_export.cmake")
	endif()

	# define the include for the protobuf library at the parent scope
	set(PROTOBUF_INCLUDE_DIRS "${CMAKE_CURRENT_SOURCE_DIR}/external/protobuf/src")
	set(PROTOBUF_INCLUDE_DIRS ${PROTOBUF_INCLUDE_DIRS} PARENT_SCOPE)

	# define the protoc executable at the parent scope
	get_property(PROTOBUF_PROTOC_EXECUTABLE TARGET protoc_compiler PROPERTY LOCATION)
	set(PROTOBUF_PROTOC_EXECUTABLE ${PROTOBUF_PROTOC_EXECUTABLE} PARENT_SCOPE)
endif()

message(STATUS "Using protobuf compiler: " ${PROTOBUF_PROTOC_EXECUTABLE})

#=============================================================================
# Copyright 2009 Kitware, Inc.
# Copyright 2009-2011 Philip Lowman <philip@yhbt.com>
# Copyright 2008 Esben Mose Hansen, Ange Optimization ApS
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# (To distribute this file outside of CMake, substitute the full
#  License text for the above reference.)
function(PROTOBUF_GENERATE_CPP SRCS HDRS)
	if(NOT ARGN)
		message(SEND_ERROR "Error: PROTOBUF_GENERATE_CPP() called without any proto files")
		return()
	endif()

	if(PROTOBUF_GENERATE_CPP_APPEND_PATH)
		# Create an include path for each file specified
		foreach(FIL ${ARGN})
			get_filename_component(ABS_FIL ${FIL} ABSOLUTE)
			get_filename_component(ABS_PATH ${ABS_FIL} PATH)
			list(FIND _protobuf_include_path ${ABS_PATH} _contains_already)
			if(${_contains_already} EQUAL -1)
				list(APPEND _protobuf_include_path -I ${ABS_PATH})
			endif()
		endforeach()
	else()
		set(_protobuf_include_path -I ${CMAKE_CURRENT_SOURCE_DIR})
	endif()

	if(DEFINED PROTOBUF_IMPORT_DIRS)
		foreach(DIR ${PROTOBUF_IMPORT_DIRS})
			get_filename_component(ABS_PATH ${DIR} ABSOLUTE)
			list(FIND _protobuf_include_path ${ABS_PATH} _contains_already)
			if(${_contains_already} EQUAL -1)
				list(APPEND _protobuf_include_path -I ${ABS_PATH})
			endif()
		endforeach()
	endif()

	if(CMAKE_CROSSCOMPILING OR USE_SYSTEM_PROTO_LIBS)
		set(PROTOC_DEPENDENCY ${PROTOBUF_PROTOC_EXECUTABLE})
	else()
		set(PROTOC_DEPENDENCY protoc_compiler)
	endif()

	set(${SRCS})
	set(${HDRS})
	foreach(FIL ${ARGN})
		get_filename_component(ABS_FIL ${FIL} ABSOLUTE)
		get_filename_component(FIL_WE ${FIL} NAME_WE)

		list(APPEND ${SRCS} "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.cc")
		list(APPEND ${HDRS} "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.h")

		add_custom_command(
			OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.cc"
				   "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.h"
			COMMAND ${PROTOBUF_PROTOC_EXECUTABLE}
			ARGS --cpp_out ${CMAKE_CURRENT_BINARY_DIR} ${_protobuf_include_path} ${ABS_FIL}
			DEPENDS ${ABS_FIL} ${PROTOC_DEPENDENCY}
			COMMENT "Running C++ protocol buffer compiler on ${FIL}"
			VERBATIM
		)
	endforeach()

	set_source_files_properties(${${SRCS}} ${${HDRS}} PROPERTIES GENERATED TRUE)
	set(${SRCS} ${${SRCS}} PARENT_SCOPE)
	set(${HDRS} ${${HDRS}} PARENT_SCOPE)
endfunction()