# see http://www.kitware.com/products/html/BuildingExternalProjectsWithCMake2.8.html
# see http://tools.cinemapub.be/opendcp/opendcp-0.19-src/contrib/CMakeLists.txt

find_package(OpenSSL)
if (OPENSSL_FOUND)
	string(REGEX REPLACE "/include$" "" OPENSSL_ROOT_DIR ${OPENSSL_INCLUDE_DIR})
	set(OPENSSL_ROOT_DIR "OPENSSL_DIR=${OPENSSL_ROOT_DIR}")
	set(COPY_LIBEVENT_SSL "libevent_openssl.lib")
else()
	# essentially a noop to work around externalproject_add syntax
	set(COPY_LIBEVENT_SSL "libevent.lib")
endif()

include(ExternalProject)
if (MSVC)
	
	externalproject_add(libevent
		URL https://github.com/libevent/libevent/releases/download/release-2.1.8-stable/libevent-2.1.8-stable.tar.gz
		URL_MD5 f3eeaed018542963b7d2416ef1135ecc
		BUILD_IN_SOURCE 1
		PREFIX ${CMAKE_BINARY_DIR}/deps/libevent
		CONFIGURE_COMMAND ""
		PATCH_COMMAND
			${CMAKE_COMMAND} -E copy "${PROJECT_SOURCE_DIR}/contrib/patches/libevent/Makefile.nmake" <SOURCE_DIR>/Makefile.nmake

		BUILD_COMMAND nmake ${OPENSSL_ROOT_DIR} -f Makefile.nmake
		INSTALL_COMMAND
			${CMAKE_COMMAND} -E make_directory ${CMAKE_BINARY_DIR}/deps/libevent/lib && 
			${CMAKE_COMMAND} -E copy libevent.lib ${CMAKE_BINARY_DIR}/deps/libevent/lib/ && 
			${CMAKE_COMMAND} -E copy libevent_core.lib ${CMAKE_BINARY_DIR}/deps/libevent/lib/ && 
			${CMAKE_COMMAND} -E copy libevent_extras.lib ${CMAKE_BINARY_DIR}/deps/libevent/lib/ && 
			${CMAKE_COMMAND} -E copy ${COPY_LIBEVENT_SSL} ${CMAKE_BINARY_DIR}/deps/libevent/lib/ && 
			${CMAKE_COMMAND} -E copy_directory include ${CMAKE_BINARY_DIR}/deps/libevent/include &&
			${CMAKE_COMMAND} -E copy Win32-Code/nmake/event2/event-config.h ${CMAKE_BINARY_DIR}/deps/libevent/include/event2/
	)
else ()
	if (UNIX)
		set(FORCE_FPIC "CFLAGS=-fPIC")
	endif()

	externalproject_add(libevent
		URL https://github.com/libevent/libevent/releases/download/release-2.1.8-stable/libevent-2.1.8-stable.tar.gz
		URL_MD5 f3eeaed018542963b7d2416ef1135ecc
		BUILD_IN_SOURCE 0
		PREFIX ${CMAKE_BINARY_DIR}/deps/libevent
		PATCH_COMMAND
			${CMAKE_COMMAND} -E copy "${PROJECT_SOURCE_DIR}/contrib/patches/libevent/sierra.kqueue.c" <SOURCE_DIR>/kqueue.c
		CONFIGURE_COMMAND
			 ${FORCE_FPIC} <SOURCE_DIR>/configure --enable-static --enable-shared --prefix=<INSTALL_DIR>
	)
	
endif()

set(LIBEVENT_INCLUDE_DIR ${CMAKE_BINARY_DIR}/deps/libevent/include)

if (APPLE)
	set(LIBEVENT_LIBRARIES ${CMAKE_BINARY_DIR}/deps/libevent/lib/libevent_core.a)
	list (APPEND LIBEVENT_LIBRARIES ${CMAKE_BINARY_DIR}/deps/libevent/lib/libevent_extra.a)
	list (APPEND LIBEVENT_LIBRARIES ${CMAKE_BINARY_DIR}/deps/libevent/lib/libevent_pthreads.a)
	if (OPENSSL_FOUND)
		list (APPEND LIBEVENT_LIBRARIES ${CMAKE_BINARY_DIR}/deps/libevent/lib/libevent_openssl.a)
	endif()
elseif (UNIX)
	set(LIBEVENT_LIBRARIES ${CMAKE_BINARY_DIR}/deps/libevent/lib/libevent_core.a)
	list (APPEND LIBEVENT_LIBRARIES ${CMAKE_BINARY_DIR}/deps/libevent/lib/libevent_extra.a)
	list (APPEND LIBEVENT_LIBRARIES ${CMAKE_BINARY_DIR}/deps/libevent/lib/libevent_pthreads.a)
	if (OPENSSL_FOUND)
		list (APPEND LIBEVENT_LIBRARIES ${CMAKE_BINARY_DIR}/deps/libevent/lib/libevent_openssl.a)
	endif()
elseif(WIN32)
	set(LIBEVENT_LIBRARIES ${CMAKE_BINARY_DIR}/deps/libevent/lib/libevent.lib)
	if (OPENSSL_FOUND)
		list (APPEND LIBEVENT_LIBRARIES ${CMAKE_BINARY_DIR}/deps/libevent/lib/libevent_openssl.lib)
	endif()

else()
	message(FATAL_ERROR "Unknown platform!")
endif()


set(LIBEVENT_BUILT ON)