cmake_minimum_required (VERSION 3.8)

cmake_policy(SET CMP0048 NEW)

if(${CMAKE_VERSION} VERSION_LESS 3.15)
	cmake_policy(VERSION ${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION})
else()
	cmake_policy(VERSION 3.15)
endif()

set(ZEROTIER_VERSION_MAJOR 1 CACHE INTERNAL "")
set(ZEROTIER_VERSION_MINOR 9 CACHE INTERNAL "")
set(ZEROTIER_VERSION_REVISION 0 CACHE INTERNAL "")
set(ZEROTIER_VERSION_BUILD 0 CACHE INTERNAL "")

project(zerotier
	VERSION ${ZEROTIER_VERSION_MAJOR}.${ZEROTIER_VERSION_MINOR}.${ZEROTIER_VERSION_REVISION}.${ZEROTIER_VERSION_BUILD}
	DESCRIPTION "ZeroTier Network Hypervisor"
	LANGUAGES CXX C)

if(NOT PACKAGE_STATIC)

	find_program(
		GO go
		HINTS "/usr/local/go/bin" "/usr/bin" "/usr/local/bin" "C:/go/bin"
	)
	if(NOT GO)
		message(FATAL_ERROR "Golang not found")
	else(NOT GO)
		message(STATUS "Found Golang at ${GO}")
	endif(NOT GO)

	set(default_build_type "Release")

	if(WIN32)
		set(CMAKE_CXX_STANDARD 17)
		set(CMAKE_SYSTEM_VERSION "7" CACHE STRING INTERNAL FORCE)
	else(WIN32)
		if(APPLE)
			set(CMAKE_CXX_STANDARD 17)
		else(APPLE)
			set(CMAKE_CXX_STANDARD 11)
		endif(APPLE)
	endif(WIN32)

	if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
		message(STATUS "Setting build type to '${default_build_type}' as none was specified.")
		set(CMAKE_BUILD_TYPE "${default_build_type}" CACHE STRING "Choose the type of build." FORCE)
		set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "Debug" "Release" "MinSizeRel" "RelWithDebInfo")
	endif()

	option(BUILD_CENTRAL_CONTROLLER "Build ZeroTier Central Controller" OFF)
	if(BUILD_CENTRAL_CONTROLLER)
		find_package(PkgConfig REQUIRED)
		if(APPLE)
			set(CMAKE_PREFIX_PATH
				${CMAKE_PREFIX_PATH}
				/usr/local/opt/libpq
				/usr/local/lib
			)
		endif(APPLE)
		find_package(PostgreSQL REQUIRED)

		pkg_check_modules(hiredis REQUIRED IMPORTED_TARGET hiredis)

		add_subdirectory(controller/thirdparty/redis-plus-plus-1.1.1)
		set(redispp_INCLUDE_DIRS ${CMAKE_CURRENT_SOURCE_DIR}/controller/thirdparty/redis-plus-plus-1.1.1/src/sw)
		set(redispp_STATIC_LIB redispp_static)
	endif(BUILD_CENTRAL_CONTROLLER)

	if(CMAKE_BUILD_TYPE STREQUAL "Debug")
		add_definitions(-DZT_DEBUG)
	endif(CMAKE_BUILD_TYPE STREQUAL "Debug")

	if(WIN32)

		message("++ Setting Windows Compiler Flags ${CMAKE_BUILD_TYPE}")

		add_definitions(-DNOMINMAX)
		add_compile_options(
			-Wall
			-Wno-deprecated
			-Wno-unused-function
			-Wno-format
			$<$<CONFIG:DEBUG>:-g>
			$<$<CONFIG:DEBUG>:-O0>
			$<$<CONFIG:RELEASE>:-O3>
			$<$<CONFIG:RELEASE>:-ffast-math>
			$<$<CONFIG:RELWITHDEBINFO>:-O3>
			$<$<CONFIG:RELWITHDEBINFO>:-g>
		)

		set(GOFLAGS
			-a
			-trimpath
		)

		if(BUILD_32BIT)
			set(CMAKE_SYSTEM_PROCESSOR "x86" CACHE STRING "system processor")
			set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32" CACHE STRING "c++ flags")
			set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m32" CACHE STRING "c flags")
			set(GOARCH "GOARCH=386" CACHE STRING "go architecture")
			add_compile_options(
				-m32
			)
			add_link_options(
				-m32
			)
		endif(BUILD_32BIT)

	else(WIN32)

		set(GOFLAGS
			-trimpath
			-buildmode=pie
		)

		if(APPLE)

			message("++ Setting MacOS Compiler Flags ${CMAKE_BUILD_TYPE}")

			set(MACOS_VERSION_MIN "10.12")

			add_compile_options(
				-Wall
				-Wno-deprecated
				-Wno-unused-function
				-mmacosx-version-min=${MACOS_VERSION_MIN}
				$<$<CONFIG:DEBUG>:-g>
				$<$<CONFIG:DEBUG>:-O0>
				$<$<CONFIG:RELEASE>:-Ofast>
				$<$<CONFIG:RELEASE>:-ffast-math>
				$<$<CONFIG:RELEASE>:-fPIE>
				$<$<CONFIG:RELEASE>:-flto>
				$<$<CONFIG:RELWITHDEBINFO>:-O1>
				$<$<CONFIG:RELWITHDEBINFO>:-fPIE>
				$<$<CONFIG:RELWITHDEBINFO>:-g>
			)

			add_link_options(
				-mmacosx-version-min=${MACOS_VERSION_MIN}
				$<$<CONFIG:RELEASE>:-flto>
			)

			set(GOFLAGS
				${GOFLAGS}
				-a
				-ldflags '-w -extldflags \"-Wl,-undefined -Wl,dynamic_lookup\"'
			)

		else(APPLE)

			message("++ Setting Linux/BSD/Posix Compiler Flags (${CMAKE_BUILD_TYPE})")

			add_compile_options(
				-Wall
				-Wno-deprecated
				-Wno-unused-function
				-Wno-format
				$<$<CONFIG:DEBUG>:-g>
				$<$<CONFIG:DEBUG>:-O0>
				$<$<CONFIG:RELEASE>:-O3>
				$<$<CONFIG:RELEASE>:-ffast-math>
				$<$<CONFIG:RELEASE>:-fPIE>
				$<$<CONFIG:RELWITHDEBINFO>:-O3>
				$<$<CONFIG:RELWITHDEBINFO>:-fPIE>
				$<$<CONFIG:RELWITHDEBINFO>:-g>
			)

			option(BUILD_32BIT "Force building as 32-bit binary" OFF)
			option(BUILD_STATIC "Build statically linked executable" OFF)
			option(BUILD_ARM_V5 "Build ARMv5" OFF)
			option(BUILD_ARM_V6 "Build ARMv6" OFF)

			if(BUILD_ARM_V5 AND BUILD_ARM_V6)
				message(FATAL_ERROR "BUILD_ARM_V5 and BUILD_ARM_V6 are mutually exclusive!")
			endif(BUILD_ARM_V5 AND BUILD_ARM_V6)

			if(BUILD_32BIT)
				set(CMAKE_SYSTEM_PROCESSOR "x86" CACHE STRING "system processor")
				set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32" CACHE STRING "c++ flags")
				set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m32" CACHE STRING "c flags")
				set(GOARCH "GOARCH=386" CACHE STRING "go architecture")
				add_compile_options(
					-m32
				)
			endif(BUILD_32BIT)

			if(BUILD_STATIC)
				add_link_options(
					-static
				)
				set(CMAKE_EXE_LINKER_FLAGS "-static ${CMAKE_EXE_LINKER_FLAGS}")
				set(GOFLAGS
					${GOFLAGS}
					-a
					-tags osusergo,netgo
					-ldflags '-w -extldflags \"-static -Wl,-unresolved-symbols=ignore-all\"'
				)
			else(BUILD_STATIC)
				set(GOFLAGS
					${GOFLAGS}
					-a
					-ldflags '-w -extldflags \"-Wl,-unresolved-symbols=ignore-all\"'
				)
			endif(BUILD_STATIC)

			if(BUILD_ARM_V5)
				set(GOARM "GOARM=5")
			endif(BUILD_ARM_V5)

			if(BUILD_ARM_V6)
				set(GOARM "GOARM=6")
			endif(BUILD_ARM_V6)

		endif(APPLE)
	endif(WIN32)

	if (
		CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64" OR
		CMAKE_SYSTEM_PROCESSOR MATCHES "amd64" OR
		CMAKE_SYSTEM_PROCESSOR MATCHES "AMD64"
	)
		message("++ Adding flags for processor ${CMAKE_SYSTEM_PROCESSOR}")
		add_compile_options(-maes -mrdrnd -mpclmul -msse -msse2 -mssse3)
	endif()

	set(GO_BUILD_TAGS)

	if(BUILD_CENTRAL_CONTROLLER)
		add_definitions(-DZT_CONTROLLER_USE_LIBPQ=1)
		set(GO_BUILD_TAGS -tags central)
	endif(BUILD_CENTRAL_CONTROLLER)

	add_subdirectory(core)
	add_subdirectory(controller)
	add_subdirectory(osdep)
	add_subdirectory(serviceiocore)

	file(GLOB go_src
		${CMAKE_SOURCE_DIR}/cmd/*.go
		${CMAKE_SOURCE_DIR}/cmd/cmd/*.go
		${CMAKE_SOURCE_DIR}/pkg/zerotier/*.go
	)

	if(WIN32)
		set(GO_EXE_NAME "zerotier.exe")
		set(GO_EXTRA_LIBRARIES "-lstdc++ -lwsock32 -lws2_32 -liphlpapi -lole32 -loleaut32 -lrpcrt4 -luuid")
	else(WIN32)
		set(GO_EXE_NAME "zerotier")
		if(CMAKE_SYSTEM_NAME MATCHES "Linux")
			set(GO_EXTRA_LIBRARIES "-lstdc++")
			if(BUILD_ARM_V5)
				set(GO_EXTRA_LIBRARIES
					${GO_EXTRA_LIBRARIES}
					"-latomic"
				)
			endif(BUILD_ARM_V5)
		else()
			set(GO_EXTRA_LIBRARIES "-lc++")
		endif()
	endif(WIN32)

	add_custom_target(
		zerotier ALL
		BYPRODUCTS ${CMAKE_BINARY_DIR}/zerotier
		SOURCES ${go_src}
		COMMAND ${CMAKE_COMMAND} -E env ${GOARCH} ${GOARM} CGO_ENABLED=1 CGO_CFLAGS=\"-O3\" CGO_LDFLAGS=\"$<TARGET_FILE:zt_core> $<TARGET_FILE:zt_controller> $<TARGET_FILE:zt_service_io_core> $<TARGET_FILE:zt_osdep> ${GO_EXTRA_LIBRARIES}\" ${GO} build  -mod=vendor ${GOFLAGS} -o ${CMAKE_BINARY_DIR}/${GO_EXE_NAME} ${CMAKE_SOURCE_DIR}/cmd/zerotier/zerotier.go
		COMMENT "Compiling Go Code..."
	)
	add_dependencies(zerotier zt_osdep zt_core zt_controller zt_service_io_core)

	install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/zerotier DESTINATION bin)

else(NOT PACKAGE_STATIC)

	if(BUILD_32BIT)
		set(CMAKE_SYSTEM_PROCESSOR "x86" CACHE STRING "system processor")
		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32" CACHE STRING "c++ flags")
		set(CMAKE_C_FLAGS   "${CMAKE_C_FLAGS} -m32" CACHE STRING "c flags")
		add_compile_options(
			-m32
		)
	endif(BUILD_32BIT)

	set(STATIC_BINARY ${CMAKE_BINARY_DIR}/zerotier)
	set(IMPORTED_LOCATION ${CMAKE_BINARY_DIR})
	add_executable(zerotier IMPORTED GLOBAL)
	install(PROGRAMS ${STATIC_BINARY} DESTINATION bin)

endif(NOT PACKAGE_STATIC)

# Linux packaging

if("${CMAKE_SYSTEM_NAME}" EQUAL "Linux")
	if(IS_DIRECTORY /lib/systemd/system)
		install(
			FILES ${CMAKE_CURRENT_SOURCE_DIR}/packaging/debian/zerotier.service
			DESTINATION /lib/systemd/system
		)
	elseif(IS_DIRECTORY /usr/lib/systemd/system)
		install(
			FILES ${CMAKE_CURRENT_SOURCE_DIR}/packaging/debian/zerotier.service
			DESTINATION /usr/lib/systemd/system
		)
	else()
		install(
			FILES ${CMAKE_CURRENT_SOURCE_DIR}/packaging/debian/zerotier.init
			DESTINATION /etc/init.d
		)
	endif()
endif()

if("${ZT_PACKAGE_FORMAT}" MATCHES "DEB")
	include(packaging/debian.cmake)
elseif("${ZT_PACKAGE_FORMAT}" MATCHES "RPM")
	include(packaging/rpm.cmake)
else()
endif()