# This files manage third party libraries required by GUDHI

find_package(Boost REQUIRED COMPONENTS system filesystem unit_test_framework chrono timer date_time program_options thread REQUIRED)

if(NOT Boost_FOUND)
  message(FATAL_ERROR "NOTICE: This program requires Boost and will not be compiled.")
endif(NOT Boost_FOUND)

find_package(GMP)
if(GMP_FOUND)
  message(STATUS "GMP_LIBRARIES = ${GMP_LIBRARIES}")
  INCLUDE_DIRECTORIES(${GMP_INCLUDE_DIR})
  find_package(GMPXX)
  if(GMPXX_FOUND)
    message(STATUS "GMPXX_LIBRARIES = ${GMPXX_LIBRARIES}")
    INCLUDE_DIRECTORIES(${GMPXX_INCLUDE_DIR})
  endif()
endif()

# In CMakeLists.txt, when include(${CGAL_USE_FILE}), CMAKE_CXX_FLAGS are overwritten.
# cf. http://doc.cgal.org/latest/Manual/installation.html#title40
# A workaround is to include(${CGAL_USE_FILE}) before adding "-std=c++11".
# A fix would be to use https://cmake.org/cmake/help/v3.1/prop_gbl/CMAKE_CXX_KNOWN_FEATURES.html
# or even better https://cmake.org/cmake/help/v3.1/variable/CMAKE_CXX_STANDARD.html
# but it implies to use cmake version 3.1 at least.
find_package(CGAL)
# Only CGAL versions > 4.4 supports what Gudhi uses from CGAL
if (CGAL_VERSION VERSION_LESS 4.4.0)
  message("CGAL version ${CGAL_VERSION} is considered too old to be used by Gudhi.")
  unset(CGAL_FOUND)
endif()
if(CGAL_FOUND)
  message(STATUS "CGAL version: ${CGAL_VERSION}.")
  include( ${CGAL_USE_FILE} )

  if (NOT CGAL_VERSION VERSION_LESS 4.8.0)
    # For dev version
    include_directories(BEFORE "src/common/include/gudhi_patches")
    # For user version
    include_directories(BEFORE "include/gudhi_patches")
  endif()
endif()

# Find TBB package for parallel sort - not mandatory, just optional.
set(TBB_FIND_QUIETLY ON)
find_package(TBB)
if (TBB_FOUND)
  include(${TBB_USE_FILE})
  message("TBB found in ${TBB_LIBRARY_DIRS}")
  add_definitions(-DGUDHI_USE_TBB)
endif()

find_package(Eigen3 3.1.0)
if (EIGEN3_FOUND)
  message(STATUS "Eigen3 version: ${EIGEN3_VERSION}.")
  include( ${EIGEN3_USE_FILE} )
  #include_directories (BEFORE "../../include")
endif (EIGEN3_FOUND)

# Required programs for unitary tests purpose
FIND_PROGRAM( GCOVR_PATH gcovr )
if (GCOVR_PATH)
  message("gcovr found in ${GCOVR_PATH}")
endif()
# Required programs for unitary tests purpose
FIND_PROGRAM( GPROF_PATH gprof )
if (GPROF_PATH)
  message("gprof found in ${GPROF_PATH}")
endif()
FIND_PROGRAM( DIFF_PATH diff )
if (DIFF_PATH)
  message("diff found in ${DIFF_PATH}")
endif()

# BOOST ISSUE result_of vs C++11
add_definitions(-DBOOST_RESULT_OF_USE_DECLTYPE)
# BOOST ISSUE with Libraries name resolution under Windows
add_definitions(-DBOOST_ALL_NO_LIB)
# problem with Visual Studio link on Boost program_options
add_definitions( -DBOOST_ALL_DYN_LINK )

INCLUDE_DIRECTORIES(${Boost_INCLUDE_DIRS})
LINK_DIRECTORIES(${Boost_LIBRARY_DIRS})

message(STATUS "boost include dirs:" ${Boost_INCLUDE_DIRS})
message(STATUS "boost library dirs:" ${Boost_LIBRARY_DIRS})