# Check for various C functions
check_cxx_symbol_exists(prctl "sys/prctl.h" HAVE_PRCTL)
check_cxx_symbol_exists(pthread_setname_np "pthread.h" HAVE_PTHREAD_SETNAME_NP)

# Go into more detail here and identify the valid signature of pthread_setname_np,
# because different systems have different forms of this function (ugh).
if (HAVE_PTHREAD_SETNAME_NP)
	include(CheckCXXSourceCompiles)
	check_cxx_source_compiles("
	#include <thread>
	int main() {
		pthread_setname_np(\"ThreadName\");
		return 0;
	}" HAVE_SINGLE_PARAMETER_SETNAME_NP)
	check_cxx_source_compiles("
	#include <thread>
	int main() {
		pthread_setname_np(pthread_self(), \"ThreadName\");
		return 0;
	}" HAVE_TWO_PARAMETER_SETNAME_NP)
endif()

add_compile_definitions(DPP_OS=${CMAKE_SYSTEM_NAME})

if(WIN32 AND NOT MINGW)
	if (NOT WINDOWS_32_BIT)
		message("-- Building for windows with precompiled packaged dependencies")
		#set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS TRUE)
		set(ZLIB_LIBRARIES "${CMAKE_CURRENT_SOURCE_DIR}/../win32/lib")
		set(ZLIB_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../win32/include")
		set(OPENSSL_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../win32/include")
		set(OPENSSL_LIBRARIES "${CMAKE_CURRENT_SOURCE_DIR}/../win32/lib")
		#ADD_DEFINITIONS(/bigobj)

		link_libraries("${CMAKE_CURRENT_SOURCE_DIR}/../win32/lib/libssl.lib")
		link_libraries("${CMAKE_CURRENT_SOURCE_DIR}/../win32/lib/libcrypto.lib")
		link_libraries("${CMAKE_CURRENT_SOURCE_DIR}/../win32/lib/zlib.lib")
		link_libraries("${CMAKE_CURRENT_SOURCE_DIR}/../win32/lib/libsodium.lib")
		link_libraries("${CMAKE_CURRENT_SOURCE_DIR}/../win32/lib/opus.lib")

		set(OPUS_INCLUDE_DIRS "${CMAKE_CURRENT_SOURCE_DIR}/../win32/include")
		set(OPUS_LIBRARIES "${CMAKE_CURRENT_SOURCE_DIR}/../win32/lib/opus.lib")
		set(sodium_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../win32/include")
		set(sodium_LIBRARY_DEBUG "${CMAKE_CURRENT_SOURCE_DIR}/../win32/lib/libsodium.lib")
		set(sodium_LIBRARY_RELEASE "${CMAKE_CURRENT_SOURCE_DIR}/../win32/lib/libsodium.lib")
		set(HAVE_OPUS_OPUS_H "${CMAKE_CURRENT_SOURCE_DIR}/../win32/include/opus/opus.h")
		set(OPUS_FOUND 1)
		SET(sodium_VERSION_STRING "win32 bundled")

		include_directories("${CMAKE_CURRENT_SOURCE_DIR}/../win32/include")

		add_compile_definitions(OPENSSL_SYS_WIN32)
		add_compile_definitions(_WINSOCK_DEPRECATED_NO_WARNINGS)
		add_compile_definitions(WIN32_LEAN_AND_MEAN)
		add_compile_definitions(_CRT_SECURE_NO_WARNINGS)
		add_compile_definitions(_CRT_NONSTDC_NO_DEPRECATE)

	endif()
endif()

if (UNIX)
	message("-- Checking for ability to update autogenerated files")
	execute_process(
		COMMAND which php
		RESULT_VARIABLE HAS_PHP
		OUTPUT_QUIET
	)

	if (${HAS_PHP} STREQUAL "0")
		message("-- Checking for update to autogenerated files")
		# target for rebuild of cluster::*_sync() functions
		execute_process(
			WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/.."
			COMMAND php buildtools/make_struct.php "\\Dpp\\Generator\\SyncGenerator"
		)
 		set_source_files_properties( "${CMAKE_CURRENT_SOURCE_DIR}/../include/dpp/cluster_sync_calls.h" PROPERTIES GENERATED TRUE ) 
	else()
		message("-- Autogeneration is not available")
 	endif()
endif()

if(NOT BUILD_SHARED_LIBS)
	if(UNIX)
		message("-- Building static library.")
		
		if(UNIX AND NOT APPLE)
			set(CMAKE_FIND_LIBRARY_SUFFIXES ".a")
		endif()
		
		set(OPENSSL_USE_STATIC_LIBS ON)
		set(sodium_USE_STATIC_LIBS ON)
		set(OPUS_USE_STATIC_LIBS TRUE)
	else()
		message(WARNING "-- Building of static library not supported on non UNIX systems.")
	endif()
endif()

include("${CMAKE_CURRENT_SOURCE_DIR}/../cmake/colour.cmake")

if (BUILD_VOICE_SUPPORT)
	if (MINGW OR NOT WIN32)
		find_package(PkgConfig QUIET)
		if(PKG_CONFIG_FOUND)
			include("${CMAKE_CURRENT_SOURCE_DIR}/../cmake/FindSodium.cmake")
		else()
			message("-- Could not detect ${Green}libsodium${ColourReset} due to missing ${Green}pkgconfig${ColourReset}. VOICE support will be ${Red}disabled${ColourReset}")
		endif()
      		include("${CMAKE_CURRENT_SOURCE_DIR}/../cmake/FindOpus.cmake")
	endif()

	if(DEFINED OPUS_FOUND)
		message("-- Found Opus ${Green}${OPUS_LIBRARIES}${ColourReset}")
		if((WIN32 OR PKG_CONFIG_FOUND) AND DEFINED sodium_VERSION_STRING AND DEFINED sodium_LIBRARY_RELEASE)
			add_compile_definitions(HAVE_VOICE)
		
			message("-- Sodium ${Green}${sodium_VERSION_STRING}${ColourReset}")
		
			set(HAVE_VOICE 1)
		endif()
	endif()

	if(HAVE_VOICE)
		message("-- Detected ${Green}libsodium${ColourReset} and ${Green}libopus${ColourReset}. VOICE support will be ${Green}enabled${ColourReset}")
	else(HAVE_VOICE)
		message("-- Could not detect ${Green}libsodium${ColourReset} and/or ${Green}libopus${ColourReset}. VOICE support will be ${Red}disabled${ColourReset}")
	endif(HAVE_VOICE)
else()
	message("-- Voice support disabled by cmake option")
endif()

string(ASCII 27 Esc)

set(THREADS_PREFER_PTHREAD_FLAG ON)

find_package(Threads REQUIRED)
if(MINGW OR NOT WIN32)
	find_package(ZLIB REQUIRED)
endif(MINGW OR NOT WIN32)

if(APPLE)
	if(CMAKE_APPLE_SILICON_PROCESSOR EQUAL arm64)
		set(OPENSSL_ROOT_DIR "/opt/homebrew/opt/openssl")
	else()
		set(OPENSSL_ROOT_DIR "/usr/local/opt/openssl")
	endif()
	find_package(OpenSSL REQUIRED)
else()
	if(MINGW OR NOT WIN32)
		find_package(OpenSSL REQUIRED)
	endif()
endif()

include_directories(${OPENSSL_INCLUDE_DIR} ${ZLIB_INCLUDE_DIRS})

find_package(Git QUIET)

if(NOT GIT_FOUND AND EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/../.git")
	message(FATAL_ERROR "You are using a git version of D++ but do not have git installed. Install git (not 'gh') and try again.")
endif()

if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/../.git")
	message("-- Building ${Green}git${ColourReset} version. ${Green}Be aware git versions may be unstable!${ColourReset}")
else()
	message("-- Building ${Green}stable${ColourReset} version ${Green}${DPP_VERSION}${ColourReset}")
endif()

if(UNIX OR MSYS)
	find_program(LDCONFIG_EXECUTABLE "ldconfig")
endif()

if(MSVC)
	if(CMAKE_BUILD_TYPE STREQUAL "Debug")
		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /std:c++17 /Od /DEBUG /Zi /sdl /DFD_SETSIZE=1024")
	else()
		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /std:c++17 /O2 /Oi /Oy /Gy /sdl /DFD_SETSIZE=1024")
	endif()
	if(NOT "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /MP /Zc:preprocessor")
		if(NOT CMAKE_BUILD_TYPE STREQUAL "Debug")
			set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /GL")
		endif()
	endif()
	string(REGEX REPLACE "/W[1|2|3|4]" "/W3" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
else()
	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wno-unused-private-field -Wno-psabi -Wempty-body -Wignored-qualifiers -Wimplicit-fallthrough -Wmissing-field-initializers -Wsign-compare -Wtype-limits -Wuninitialized -Wshift-negative-value -pthread")
	set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -Og")

	if (NOT MINGW)
		add_link_options("-rdynamic")
	endif ()
endif()

set(modules_dir "../src")

file(GLOB subdirlist ${modules_dir}/dpp)

foreach (fullmodname ${subdirlist})
    get_filename_component(modname ${fullmodname} NAME)
    set (modsrc "")
	
	file(GLOB modsrc "${modules_dir}/dpp/*.cpp" "${modules_dir}/dpp/events/*.cpp" "${modules_dir}/dpp/cluster/*.cpp" "${modules_dir}/dpp/*.rc")

	if(BUILD_SHARED_LIBS)
		add_library(${modname} SHARED ${modsrc})
	else()
		add_library(${modname} STATIC ${modsrc})
	endif()
	set_target_properties(${modname} 
		PROPERTIES
		VERSION ${CMAKE_PROJECT_VERSION}
		SOVERSION ${CMAKE_PROJECT_VERSION}
		POSITION_INDEPENDENT_CODE true
	)
	target_include_directories(${modname} PUBLIC 
		$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/../include>
		$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/../include/dpp>
	)

	if (WIN32 AND NOT MINGW)
		if (NOT WINDOWS_32_BIT)
			target_link_libraries(${modname} PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/../win32/lib/libssl.lib"
				"${CMAKE_CURRENT_SOURCE_DIR}/../win32/lib/libcrypto.lib"
				"${CMAKE_CURRENT_SOURCE_DIR}/../win32/lib/libsodium.lib"
				"${CMAKE_CURRENT_SOURCE_DIR}/../win32/lib/opus.lib"
				"${CMAKE_CURRENT_SOURCE_DIR}/../win32/lib/zlib.lib")
		else()
			target_link_libraries(${modname} PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/../win32/32/lib/libssl.lib"
				"${CMAKE_CURRENT_SOURCE_DIR}/../win32/32/lib/libcrypto.lib"
				"${CMAKE_CURRENT_SOURCE_DIR}/../win32/32/lib/libsodium.lib"
				"${CMAKE_CURRENT_SOURCE_DIR}/../win32/32/lib/opus.lib"
				"${CMAKE_CURRENT_SOURCE_DIR}/../win32/32/lib/zlib.lib")
		endif()

	else()
		target_link_libraries(${modname} PUBLIC ${OPENSSL_CRYPTO_LIBRARY} ${OPENSSL_SSL_LIBRARY} ${ZLIB_LIBRARIES})
		if (MINGW)
			target_link_libraries(${modname} PUBLIC wsock32 ws2_32 crypt32)
		endif ()
	endif()

	if (HAVE_VOICE)
		target_link_libraries(${modname} PUBLIC ${sodium_LIBRARY_RELEASE} ${OPUS_LIBRARIES})
		
		include_directories(${OPUS_INCLUDE_DIRS} ${sodium_INCLUDE_DIR})
	endif()
endforeach()

target_compile_features(dpp PUBLIC cxx_std_17)
target_compile_features(dpp PRIVATE cxx_constexpr)
target_compile_features(dpp PRIVATE cxx_auto_type)
target_compile_features(dpp PRIVATE cxx_defaulted_functions)
target_compile_features(dpp PRIVATE cxx_deleted_functions)
target_compile_features(dpp PRIVATE cxx_final)
target_compile_features(dpp PRIVATE cxx_lambdas)
target_compile_features(dpp PRIVATE cxx_override)
target_compile_features(dpp PRIVATE cxx_thread_local)
target_compile_features(dpp PRIVATE cxx_variadic_templates)
target_compile_features(dpp PRIVATE cxx_attribute_deprecated)

if (DPP_BUILD_TEST)
	enable_testing(${CMAKE_CURRENT_SOURCE_DIR}/..)
	file(GLOB testnamelist "${CMAKE_CURRENT_SOURCE_DIR}/../src/*")
	foreach (fulltestname ${testnamelist})
		get_filename_component(testname ${fulltestname} NAME)
		if (NOT "${testname}" STREQUAL "dpp")
			message("-- Configuring test: ${Green}${testname}${ColourReset} with source: ${modules_dir}/${testname}/*.cpp")
			set (testsrc "")
			file(GLOB testsrc "${modules_dir}/${testname}/*.cpp")
			add_executable(${testname} ${testsrc})
			target_compile_features(${testname} PRIVATE cxx_std_17)
			target_link_libraries(${testname} PUBLIC ${modname})
		endif()
	endforeach()
	add_test(
		NAME unittests
		COMMAND library/unittest
		WORKING_DIRECTORY ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/library
	)
endif()

if(HAVE_PRCTL)
	target_compile_definitions(dpp PRIVATE HAVE_PRCTL)
endif()
if(HAVE_PTHREAD_SETNAME_NP)
	target_compile_definitions(dpp PRIVATE HAVE_PTHREAD_SETNAME_NP)
endif()

if(DPP_CORO)
	message("-- ${Yellow}Enabled experimental coroutine support${ColourReset}")
	set(CMAKE_CXX_STANDARD 20)
	target_compile_features(dpp PRIVATE cxx_std_20)
	if(WIN32 AND NOT MINGW)
		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /await:strict")
	else()
		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fcoroutines")
	endif()
	target_compile_definitions(dpp PUBLIC DPP_CORO)
	execute_process(WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/.."
					COMMAND php buildtools/make_struct.php "\\Dpp\\Generator\\CoroGenerator")
endif()
	
if(WIN32 AND NOT MINGW)
	if (NOT WINDOWS_32_BIT)
		configure_file("${CMAKE_CURRENT_SOURCE_DIR}/../win32/bin/zlib1.dll" "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}" COPYONLY)
		configure_file("${CMAKE_CURRENT_SOURCE_DIR}/../win32/bin/libcrypto-1_1-x64.dll" "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}" COPYONLY)
		configure_file("${CMAKE_CURRENT_SOURCE_DIR}/../win32/bin/libssl-1_1-x64.dll" "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}" COPYONLY)
		configure_file("${CMAKE_CURRENT_SOURCE_DIR}/../win32/bin/libsodium.dll" "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}" COPYONLY)
		configure_file("${CMAKE_CURRENT_SOURCE_DIR}/../win32/bin/opus.dll" "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}" COPYONLY)
	else()
		configure_file("${CMAKE_CURRENT_SOURCE_DIR}/../win32/32/bin/zlib1.dll" "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}" COPYONLY)
		configure_file("${CMAKE_CURRENT_SOURCE_DIR}/../win32/32/bin/libcrypto-1_1.dll" "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}" COPYONLY)
		configure_file("${CMAKE_CURRENT_SOURCE_DIR}/../win32/32/bin/libssl-1_1.dll" "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}" COPYONLY)
		configure_file("${CMAKE_CURRENT_SOURCE_DIR}/../win32/32/bin/libsodium.dll" "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}" COPYONLY)
		configure_file("${CMAKE_CURRENT_SOURCE_DIR}/../win32/32/bin/opus.dll" "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}" COPYONLY)
	endif()
endif()

if(DPP_INSTALL)
	if(NOT WIN32)
		# Installation

		include(GNUInstallDirs)
		install(TARGETS dpp LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})
		message("Library install directory at ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}")
		install(DIRECTORY ../include/ DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
		message("Include files install directory at ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_INCLUDEDIR}")
		install(CODE "execute_process(COMMAND ${CMAKE_COMMAND} -DRUN_LDCONFIG=${RUN_LDCONFIG} -DLDCONFIG_EXECUTABLE=${LDCONFIG_EXECUTABLE} -P ${CMAKE_CURRENT_SOURCE_DIR}/../cmake/PostInstall.cmake)")

		configure_file("${CMAKE_CURRENT_SOURCE_DIR}/../dpp.pc.in" "${CMAKE_BINARY_DIR}/dpp.pc" @ONLY)
		install(FILES "${CMAKE_BINARY_DIR}/dpp.pc" DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
	elseif(MINGW)
		install(TARGETS dpp LIBRARY DESTINATION ${CMAKE_INSTALL_PREFIX}/lib)
		install(DIRECTORY ../include/ DESTINATION ${CMAKE_INSTALL_PREFIX}/include)
	endif()

	include("${CMAKE_CURRENT_SOURCE_DIR}/../cmake/CPackSetup.cmake")						# Setup information for packaging and distribution

	# CPack initialization for distribution
	include(CPack)
endif()