cmake_minimum_required(VERSION 3.0)
project(lib4neuro)

message("Using CMake ${CMAKE_VERSION}")

#TODO request newer version of CMake >=3.12

#TODO rewrite to use add_compile_definitions
if(WIN32)
    add_compile_options("/D BOOST_ALL_NO_LIB")
    add_compile_options("/D NOMINMAX")
else()
	add_compile_options("-DBOOST_TEST_DYN_LINK")
endif()

#------------#
# Build type #
#------------#
# Release / None / Debug
if (NOT CMAKE_BUILD_TYPE)
    set (CMAKE_BUILD_TYPE RELEASE CACHE STRING
         "Choose the type of build, options are: None Debug Release."
         FORCE)
elseif("CMAKE_BUILD_TYPE" STREQUAL "Debug")
    #TODO rewrite to use add_compile_definitions
endif (NOT CMAKE_BUILD_TYPE)

#------------------------#
# Dependencies link type #
#------------------------#
if(NOT DEPENDENCIES_LINK_TYPE AND NOT ENV{DEPENDENCIES_LINK_TYPE})
    message(FATAL_ERROR "Please, set the variable DEPENDENCIES_LINK_TYPE to either 'static' or 'shared'!")
endif()

#--------------------------------#
# Setting C++ compiler flags #
#--------------------------------#
set(CMAKE_CXX_STANDARD 17)

#set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}" )

if( "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Intel" )
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -xHost" )
elseif( "${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC" ) 
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /W0 /bigobj")
    add_compile_options("/D _SCL_SECURE_NO_WARNINGS")
    add_compile_options("/D_CRT_SECURE_NO_WARNINGS")
else()
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall")
endif()

#--------------------#
# Automatic settings #
#--------------------#
if(CMAKE_BUILD_TYPE MATCHES DEBUG)
  set(CMAKE_VERBOSE_MAKEFILE ON)
endif()

#-------------------------#
# Find external libraries #
#-------------------------#
message("Looking for external libraries...")
set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR})

set(Boost_USE_MULTITHREADED ON)
set(Boost_DEBUG ON)

find_package(
    Boost

    COMPONENTS 
        system 
        serialization 
        random
)

if(NOT Boost_FOUND)
    message(FATAL_ERROR "Boost was NOT found! Specify variables BOOST_INCLUDEDIR and BOOST_LIBRARYDIR!")
endif()

message("Boost_INCLUDE_DIRS: ${Boost_INCLUDE_DIRS}")
message("Boost_LIBRARY_DIRS: ${Boost_LIBRARY_DIRS}")
message("Boost_LIBRARIES: ${Boost_LIBRARIES}")

message("lib4neuro LIB DIR: ${LIB4NEURO_DIR}")

find_package(exprtk)

#------------------------------------------#
# Detect maximum available number of cores #
# and set corresponding build options      #
#------------------------------------------#
message("Detecting available cores count...")
include(ProcessorCount)
ProcessorCount(n_cores)
if(n_cores GREATER 1)
    math(EXPR n_cores "${n_cores}-1")
    message("Build will be performed on ${n_cores} cores.")
    set(CTEST_BUILD_FLAGS -j${N})
    set(ENV{N_CORES} ${N})
    set(ctest_test_args ${ctest_test_args} PARALLEL_LEVEL ${N})
endif()

#---------------#
# Set variables #
#---------------#
set(ROOT_DIR ${CMAKE_CURRENT_LIST_DIR})
set(SRC_DIR ${CMAKE_CURRENT_LIST_DIR}/src)
set(PROJECT_BINARY_DIR ${CMAKE_CURRENT_LIST_DIR}/build)
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY lib)
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY lib)
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/bin)

#----------------------------------------#
# Dependencies for the lib4neuro library #
#----------------------------------------#
message("Running CMake in: ${SRC_DIR} ${PROJECT_BINARY_DIR}")

add_subdirectory(${SRC_DIR} ${PROJECT_BINARY_DIR})