cmake_minimum_required(VERSION 3.0)

#emulate a target 3rd party library folders
SET(3RDPARTY_ROOT "/tmp/3rdparty")

MACRO(DETECT_USRSCTPLIB issueError)
	#status messages
	MESSAGE(STATUS "Looking for usrsctp")
	MESSAGE(STATUS "Before calling UNSET: USRSCTP_INCLUDE_PATH: ${USRSCTP_INCLUDE_PATH}")
	MESSAGE(STATUS "Before calling UNSET: USRSCTP_LIBRARY_PATH: ${USRSCTP_LIBRARY_PATH}")

	#unset the variables
	UNSET(USRSCTP_INCLUDE_PATH)
	UNSET(USRSCTP_LIBRARY_PATH)
	UNSET(USRSCTP_INCLUDE_PATH CACHE)
	UNSET(USRSCTP_LIBRARY_PATH CACHE)
	MESSAGE(STATUS "After calling UNSET, before FIND_XXX: USRSCTP_INCLUDE_PATH: ${USRSCTP_INCLUDE_PATH}")
	MESSAGE(STATUS "After calling UNSET, before FIND_XXX: USRSCTP_LIBRARY_PATH: ${USRSCTP_LIBRARY_PATH}")

	#attempt the find
	FIND_PATH(USRSCTP_INCLUDE_PATH
		NAMES
			usrsctp.h
		PATHS
			${3RDPARTY_ROOT}/install/include
			NO_DEFAULT_PATH)

	FIND_LIBRARY(USRSCTP_LIBRARY_PATH
		NAMES
			usrsctp
		PATHS
			${3RDPARTY_ROOT}/install/lib
			NO_DEFAULT_PATH)

	MESSAGE(STATUS "After calling FIND_XXX: USRSCTP_INCLUDE_PATH: ${USRSCTP_INCLUDE_PATH}")
	MESSAGE(STATUS "After calling FIND_XXX: USRSCTP_LIBRARY_PATH: ${USRSCTP_LIBRARY_PATH}")

	IF(USRSCTP_INCLUDE_PATH)
		SET(USRSCTP_FOUND 1 CACHE STRING "Set to 1 if usrsctp is found, 0 otherwise")
		MESSAGE(STATUS "Looking for usrsctp headers - found")
	ELSE(USRSCTP_INCLUDE_PATH)
		IF(${issueError} MATCHES "1")
			SET(USRSCTP_FOUND 0 CACHE STRING "Set to 1 if usrsctp is found, 0 otherwise")
			MESSAGE(FATAL_ERROR "Looking for usrsctp headers - not found")
		ELSE(${issueError} MATCHES "1")
			SET(USRSCTP_FOUND 0)
		ENDIF(${issueError} MATCHES "1")
	ENDIF(USRSCTP_INCLUDE_PATH)

	IF(USRSCTP_LIBRARY_PATH)
		SET(USRSCTP_FOUND 1 CACHE STRING "Set to 1 if usrsctp is found, 0 otherwise")
		MESSAGE(STATUS "Looking for usrsctp library - found")
	ELSE(USRSCTP_LIBRARY_PATH)
		IF(${issueError} MATCHES "1")
			SET(USRSCTP_FOUND 0 CACHE STRING "Set to 1 if usrsctp is found, 0 otherwise")
			MESSAGE(FATAL_ERROR "Looking for usrsctp library - not found")
		ELSE(${issueError} MATCHES "1")
			SET(USRSCTP_FOUND 0)
		ENDIF(${issueError} MATCHES "1")
	ENDIF(USRSCTP_LIBRARY_PATH)
ENDMACRO(DETECT_USRSCTPLIB)

#try to detect first, tolerate failures
DETECT_USRSCTPLIB("0")
IF(NOT ${USRSCTP_FOUND})
	#ok, lib not there, try to build it
	MESSAGE(STATUS "usrsctp library not found. Try to build it...")

	#emulate the build
	EXECUTE_PROCESS(COMMAND mkdir -p ${3RDPARTY_ROOT}/install/include ${3RDPARTY_ROOT}/install/lib)
	EXECUTE_PROCESS(COMMAND touch ${3RDPARTY_ROOT}/install/include/usrsctp.h)
	EXECUTE_PROCESS(COMMAND touch ${3RDPARTY_ROOT}/install/lib/libusrsctp.a)

	#try to find it again, this time with errors
	DETECT_USRSCTPLIB("1")

	#done
	MARK_AS_ADVANCED(USRSCTP_FOUND)
ELSE(NOT ${USRSCTP_FOUND})
	#found, done
	MARK_AS_ADVANCED(USRSCTP_FOUND)
ENDIF(NOT ${USRSCTP_FOUND})