# This file was taken from: 
# https://github.com/jrl-umi3218/jrl-cmakemodules/blob/master/ros.cmake

MACRO(ADD_ROSPACK_DEPENDENCY PKG)
  IF(PKG STREQUAL "")
    MESSAGE(FATAL_ERROR "ADD_ROS_DEPENDENCY invalid call.")
  ENDIF()

  # Transform package name into a valid variable prefix.
  # 1. replace invalid characters into underscores.
  STRING(REGEX REPLACE "[^a-zA-Z0-9]" "_" PREFIX "${PKG}")
  # 2. make it uppercase.
  STRING(TOUPPER "${PREFIX}" "PREFIX")

  SET(${PREFIX}_FOUND 0)

  FIND_PROGRAM(ROSPACK rospack)
  IF(NOT ROSPACK)
    MESSAGE(FATAL_ERROR "failed to find the rospack binary. Is ROS installed?")
  ENDIF()

  MESSAGE(STATUS "Looking for ${PKG} using rospack...")
  EXEC_PROGRAM("${ROSPACK} find ${PKG}" OUTPUT_VARIABLE ${PKG}_ROS_PREFIX)
  IF(NOT ${PKG}_ROS_PREFIX)
    MESSAGE(FATAL_ERROR "Failed to detect ${PKG}.")
  ENDIF()

  SET(${PREFIX}_FOUND 1)
  EXEC_PROGRAM("${ROSPACK} export --lang=cpp --attrib=cflags -q ${PKG}"
    OUTPUT_VARIABLE "${PREFIX}_CFLAGS")
  EXEC_PROGRAM("${ROSPACK} export --lang=cpp --attrib=lflags -q ${PKG}"
    OUTPUT_VARIABLE "${PREFIX}_LIBS")

  # Add flags to package pkg-config file.
  PKG_CONFIG_APPEND_CFLAGS (${${PREFIX}_CFLAGS})
  PKG_CONFIG_APPEND_LIBS_RAW (${${PREFIX}_LIBS})
ENDMACRO()

MACRO(ROSPACK_USE_DEPENDENCY TARGET PKG)
  IF(PKG STREQUAL "")
    MESSAGE(FATAL_ERROR "ADD_ROS_DEPENDENCY invalid call.")
  ENDIF()

  # Transform package name into a valid variable prefix.
  # 1. replace invalid characters into underscores.
  STRING(REGEX REPLACE "[^a-zA-Z0-9]" "_" PREFIX "${PKG}")
  # 2. make it uppercase.
  STRING(TOUPPER "${PREFIX}" "PREFIX")

  # Make sure we do not override previous flags.
  GET_TARGET_PROPERTY(CFLAGS "${TARGET}" COMPILE_FLAGS)
  GET_TARGET_PROPERTY(LDFLAGS "${TARGET}" LINK_FLAGS)

  # If there were no previous flags, get rid of the XYFLAGS-NOTFOUND
  # in the variables.
  IF(NOT CFLAGS)
    SET(CFLAGS "")
  ENDIF()
  IF(NOT LDFLAGS)
    SET(LDFLAGS "")
  ENDIF()

  # Transform semi-colon seperated list in to space separated list.
  FOREACH(FLAG ${${PREFIX}_CFLAGS})
    SET(CFLAGS "${CFLAGS} ${FLAG}")
  ENDFOREACH()

  FOREACH(FLAG ${${PREFIX}_LDFLAGS})
    SET(LDFLAGS "${LDFLAGS} ${FLAG}")
  ENDFOREACH()

  # Filter out end of line in new flags.
  STRING(REPLACE "\n" "" ${PREFIX}_CFLAGS "${${PREFIX}_CFLAGS}")
  STRING(REPLACE "\n" "" ${PREFIX}_LIBS "${${PREFIX}_LIBS}")

  # Append new flags.
  SET(CFLAGS "${CFLAGS} ${${PREFIX}_CFLAGS}")
  SET(LDFLAGS "${LDFLAGS} ${${PREFIX}_LIBS}")

	# MESSAGE (STATUS "Linkerflags for ${TARGET}: ${LDFLAGS}")

	# Explicitly link against the shared object file
	EXEC_PROGRAM("${ROSPACK} export find ${PKG}"
		OUTPUT_VARIABLE "${PKG_FULL_PATH}")

	#	SET (LDFLAGS "${LDFLAGS} ${PKG_FULL_PATH}/lib/lib${PKG}.so")

  # Update the flags.
  SET_TARGET_PROPERTIES(${TARGET}
    PROPERTIES COMPILE_FLAGS "${CFLAGS}" LINK_FLAGS "${LDFLAGS}")
ENDMACRO()