#---Check if cmake has the required version-----------------------------------------------------
cmake_minimum_required(VERSION 3.4.3 FATAL_ERROR)
cmake_policy(SET CMP0005 NEW)
include(cmake/modules/CaptureCommandLine.cmake)

#---Set name of the project to "ROOT". Has to be done after check of cmake version--------------
project(ROOT)
set(IntegratedBuild ON)

#---Set pathes where to put the libraries, executables and headers------------------------------
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
set(ROOTSYS ${CMAKE_BINARY_DIR})
set(HEADER_OUTPUT_PATH ${CMAKE_BINARY_DIR}/include)
set(ROOT_INCLUDE_DIR ${HEADER_OUTPUT_PATH})

#---Set the library version in the main CMakeLists.txt------------------------------------------
file(READ ${CMAKE_SOURCE_DIR}/build/version_number versionstr)
string(STRIP ${versionstr} versionstr)
string(REGEX REPLACE "([0-9]+)[.][0-9]+[/][0-9]+" "\\1" ROOT_MAJOR_VERSION ${versionstr})
string(REGEX REPLACE "[0-9]+[.]([0-9]+)[/][0-9]+" "\\1" ROOT_MINOR_VERSION ${versionstr})
string(REGEX REPLACE "[0-9]+[.][0-9]+[/]([0-9]+)" "\\1" ROOT_PATCH_VERSION ${versionstr})
set(ROOT_VERSION "${ROOT_MAJOR_VERSION}.${ROOT_MINOR_VERSION}.${ROOT_PATCH_VERSION}")

#---Where to look first for cmake modules, before ${CMAKE_ROOT}/Modules/ is checked-------------
set(CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake/modules)

#---Enable Folders in IDE like Visual Studio----------------------------------------------------
set_property(GLOBAL PROPERTY USE_FOLDERS ON)

#---Load some basic macros which are needed later for the confiuration and build----------------
include(RootBuildOptions)
include(RootNewMacros)
include(CheckCompiler)
include(MacroEnsureVersion)

#---Enable CCache ------------------------------------------------------------------------------
if(ccache)
   find_program(ccache_cmd NAMES ccache ccache-swig)
   mark_as_advanced(ccache_cmd ${ccache_cmd})
   if(ccache_cmd)
      message(STATUS "Using ccache for building")
      set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ccache)
   else()
      message(STATUS "Could NOT find ccache")
   endif()
endif()

#---Enable CTest package -----------------------------------------------------------------------
#include(CTest)
if(testing)
  enable_testing()
endif()

#---Check if the user wants to build the project in the source directory------------------------
ROOT_CHECK_OUT_OF_SOURCE_BUILD()

#---Here we look for installed software and switch on and of the different build options--------
include(SearchInstalledSoftware)
ROOT_SHOW_OPTIONS()

#---Here we add tcmalloc to the linker flags if needed------------------------------------------
if (TCMALLOC_FOUND)
  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -ltcmalloc -L ${TCMALLOC_LIBRARY_PATH}")
  set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -ltcmalloc -L ${TCMALLOC_LIBRARY_PATH}")
endif()

#---Here we add jemalloc to the linker flags if needed------------------------------------------
if (JEMALLOC_FOUND)
  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -ljemalloc -L ${JEMALLOC_LIBRARY_PATH}")
  set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -ljemalloc -L ${JEMALLOC_LIBRARY_PATH}")
endif()

#---Populate the configure arguments returned by 'root-config --config'-------------------------
get_cmake_property(variables CACHE_VARIABLES)
foreach(var ${variables})
  if((var MATCHES "_(LIBRARIES|LIBRARY|INCLUDE)") AND
     (NOT ${${var}} STREQUAL "") AND
     (NOT ${var} MATCHES "NOTFOUND"))
    if (var MATCHES "^QT_")
      # filter out the very long list of Qt libraries and include dirs
      if (var MATCHES "(QT_LIBRARY_DIR|QT_QTCORE_INCLUDE_DIR)")
        set(ROOT_CONFIGARGS "${ROOT_CONFIGARGS}${var}=${${var}} ")
      endif()
    else()
      if ((NOT var MATCHES "_(DOCS|TESTS|INSTALL)") AND (NOT var MATCHES "^_"))
        set(ROOT_CONFIGARGS "${ROOT_CONFIGARGS}${var}=${${var}} ")
      endif()
    endif()
  endif()
endforeach()

#---Move (copy) the headers and other directories to binary tree---------------------------------
set(stamp_file ${CMAKE_CURRENT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/move_artifacts.stamp)
add_custom_command(OUTPUT ${stamp_file}
                   COMMAND ${CMAKE_COMMAND} -E copy_directory ${CMAKE_SOURCE_DIR}/etc ${CMAKE_BINARY_DIR}/etc
                   COMMAND ${CMAKE_COMMAND} -E copy_directory ${CMAKE_SOURCE_DIR}/icons ${CMAKE_BINARY_DIR}/icons
                   COMMAND ${CMAKE_COMMAND} -E copy_directory ${CMAKE_SOURCE_DIR}/fonts ${CMAKE_BINARY_DIR}/fonts
                   COMMAND ${CMAKE_COMMAND} -E copy_directory ${CMAKE_SOURCE_DIR}/macros ${CMAKE_BINARY_DIR}/macros
                   COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_SOURCE_DIR}/LICENSE ${CMAKE_BINARY_DIR}/LICENSE
                   COMMAND ${CMAKE_COMMAND} -E copy_directory ${CMAKE_SOURCE_DIR}/README ${CMAKE_BINARY_DIR}/README
                   COMMAND ${CMAKE_COMMAND} -E touch ${stamp_file}
                   COMMENT "Copying directories such as etc, icons, fonts, etc. to build area")

#---Copy the the tutorials to the build area, with dependency---------------------------------
file(GLOB_RECURSE tutorial_files RELATIVE ${CMAKE_SOURCE_DIR} tutorials/*)
set(tutorial_files_builddir "")
foreach(tutorial_file ${tutorial_files})
  # Filter out hsimple.root; someone might have created it in the src dir, and the hsimple.root
  # target below will interfere.
  if (NOT (tutorial_file STREQUAL "tutorials/hsimple.root"))
    # Works, but triggers re-config for every change in tutorials/
    #configure_file(${CMAKE_SOURCE_DIR}/${tutorial_file} ${CMAKE_BINARY_DIR}/${tutorial_file} COPYONLY)
    add_custom_command(OUTPUT ${CMAKE_BINARY_DIR}/${tutorial_file}
      COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_SOURCE_DIR}/${tutorial_file} ${CMAKE_BINARY_DIR}/${tutorial_file}
      DEPENDS ${CMAKE_SOURCE_DIR}/${tutorial_file})
    set(tutorial_files_builddir "${CMAKE_BINARY_DIR}/${tutorial_file};${tutorial_files_builddir}")
  endif()
endforeach()

add_custom_target(move_headers DEPENDS ${stamp_file} ${tutorial_files_builddir}
                               COMMAND ${CMAKE_COMMAND} -DPREFIX=${CMAKE_BINARY_DIR}
                                                        -DCOMPONENTS="headers"
                                                        -P ${CMAKE_SOURCE_DIR}/cmake/scripts/local_install.cmake)
include_directories(${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_INCLUDEDIR})


#---Recurse into the given subdirectories.  This does not actually cause another cmake executable
#  to run. The same process will walk through the project's entire directory structure.
add_subdirectory (interpreter)
add_subdirectory (core)
add_subdirectory (build)
add_subdirectory (math)
add_subdirectory (hist)
add_subdirectory (tree)
add_subdirectory (io)
add_subdirectory (net)
add_subdirectory (graf2d)
add_subdirectory (graf3d)
add_subdirectory (gui)
add_subdirectory (proof)
add_subdirectory (html)
add_subdirectory (montecarlo)
add_subdirectory (geom)
add_subdirectory (rootx)
add_subdirectory (misc)
add_subdirectory (main)
add_subdirectory (bindings)
add_subdirectory (sql)
if(tmva)
  add_subdirectory(tmva)
endif()
if(roofit)
  add_subdirectory(roofit)
endif()

ROOT_ADD_TEST_SUBDIRECTORY(test)
ROOT_ADD_TEST_SUBDIRECTORY(tutorials)

#---Global PCH-----------------------------------------------------------------------------------
get_property(__allTargets GLOBAL PROPERTY ROOT_DICTIONARY_TARGETS)
get_property(__allFiles GLOBAL PROPERTY ROOT_DICTIONARY_FILES)
get_property(__clingetcpch GLOBAL PROPERTY CLINGETCPCH)


string(REGEX REPLACE "[ ]-" ";-" CMAKE_CXX_FLAGS_SEPARATE ${CMAKE_CXX_FLAGS})
if(cxxmodules)
  # rootcling uses our internal version of clang. Passing the modules flags here
  # would allow rootcling to find module files built by the external compiler
  # (eg. $CXX or $CC). This, in turn, would cause problems if we are using
  # different clang version (even different commit revision) as the modules files
  # are not guaranteed to be compatible among clang revisions.
  string(REPLACE "${ROOT_CXXMODULES_FLAGS}" "" CMAKE_CXX_FLAGS_SEPARATE ${CMAKE_CXX_FLAGS_SEPARATE})
endif(cxxmodules)
add_custom_command(OUTPUT etc/dictpch/allLinkDefs.h
                          etc/dictpch/allHeaders.h
                          etc/dictpch/allCppflags.txt
                   COMMAND ${PYTHON_EXECUTABLE} ${CMAKE_SOURCE_DIR}/build/unix/makepchinput.py ${CMAKE_SOURCE_DIR} . ${__clingetcpch} -- ${CMAKE_CXX_FLAGS_SEPARATE}
                   DEPENDS ${CMAKE_SOURCE_DIR}/build/unix/makepchinput.py ${__allFiles})

add_custom_command(OUTPUT etc/allDict.cxx.pch
                   COMMAND ${PYTHON_EXECUTABLE} ${CMAKE_SOURCE_DIR}/etc/dictpch/makepch.py etc/allDict.cxx.pch -I${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_INCLUDEDIR}
                   DEPENDS ${CMAKE_SOURCE_DIR}/etc/dictpch/makepch.py
                           etc/dictpch/allLinkDefs.h
                           etc/dictpch/allHeaders.h
                           etc/dictpch/allCppflags.txt
                           rootcling)
add_custom_target(onepcm ALL DEPENDS etc/allDict.cxx.pch)
set_source_files_properties(${__allFiles} PROPERTIES GENERATED TRUE)
add_dependencies(onepcm ${__allTargets})
install(FILES ${CMAKE_BINARY_DIR}/etc/allDict.cxx.pch DESTINATION ${CMAKE_INSTALL_SYSCONFDIR})
install(DIRECTORY ${CMAKE_BINARY_DIR}/etc/dictpch DESTINATION ${CMAKE_INSTALL_SYSCONFDIR})

#---CXX MODULES-----------------------------------------------------------------------------------
if(cxxmodules)
  add_custom_target(copymodulemap
                    DEPENDS build/unix/module.modulemap
                    COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_SOURCE_DIR}/build/unix/module.modulemap ${CMAKE_BINARY_DIR}/include/module.modulemap
                    )
  add_dependencies(copymodulemap move_headers)
endif(cxxmodules)

#---hsimple.root---------(use the executable for clearer dependencies and proper return code)---
if(NOT gnuinstall)   # TODO hsimple.root for gnuinstall
  add_custom_target(hsimple ALL DEPENDS tutorials/hsimple.root)
  add_dependencies(hsimple onepcm)
  if(WIN32)
    add_custom_command(OUTPUT tutorials/hsimple.root
                       COMMAND set PATH=${CMAKE_RUNTIME_OUTPUT_DIRECTORY} && 
                               $<TARGET_FILE:root.exe> -l -q -b -n -x hsimple.C -e return
                       WORKING_DIRECTORY tutorials DEPENDS root.exe Cling Hist Tree Gpad Graf HistPainter)
  else()
    add_custom_command(OUTPUT tutorials/hsimple.root
                       COMMAND ${ld_library_path}=${CMAKE_LIBRARY_OUTPUT_DIRECTORY}:$ENV{${ld_library_path}} 
                               $<TARGET_FILE:root.exe> -l -q -b -n -x hsimple.C -e return
                       WORKING_DIRECTORY tutorials DEPENDS root.exe Cling Hist Tree Gpad Graf HistPainter)
  endif()
  install(FILES ${CMAKE_BINARY_DIR}/tutorials/hsimple.root DESTINATION ${CMAKE_INSTALL_TUTDIR} COMPONENT tests)
endif()

#---version--------------------------------------------------------------------------------------
add_custom_target(version COMMAND ${CMAKE_SOURCE_DIR}/build/unix/makeversion.sh ${CMAKE_BINARY_DIR}
                          WORKING_DIRECTORY ${CMAKE_SOURCE_DIR})
#add_dependencies(version root.exe)

#---distribution commands------------------------------------------------------------------------
add_custom_target(distsrc COMMAND ${CMAKE_SOURCE_DIR}/build/unix/makedistsrc.sh ${CMAKE_SOURCE_DIR})
add_custom_target(dist COMMAND cpack --config CPackConfig.cmake)

#---Configure and install various files neded later and for clients -----------------------------
include(RootConfiguration)

#---Installation of project-wise artifacts-------------------------------------------------------
if(NOT CMAKE_SOURCE_DIR STREQUAL CMAKE_INSTALL_PREFIX)
  install(FILES LICENSE DESTINATION ${CMAKE_INSTALL_DOCDIR})
  if(gnuinstall)
    install(DIRECTORY README/ DESTINATION ${CMAKE_INSTALL_DOCDIR})
  else()
    install(DIRECTORY README DESTINATION ${CMAKE_INSTALL_DOCDIR})
  endif()
  install(DIRECTORY etc/ DESTINATION ${CMAKE_INSTALL_SYSCONFDIR} USE_SOURCE_PERMISSIONS
                         REGEX system.rootrc EXCLUDE
                         REGEX system.rootauthrc EXCLUDE
                         REGEX system.rootdaemonrc EXCLUDE
                         REGEX rootd.rc.d EXCLUDE
                         REGEX proofd.rc.d EXCLUDE
                         REGEX rootd.xinetd EXCLUDE
                         REGEX proofd.xinetd EXCLUDE
                         REGEX root.mimes EXCLUDE
                         REGEX cmake EXCLUDE )
  install(DIRECTORY fonts/  DESTINATION ${CMAKE_INSTALL_FONTDIR})
  install(DIRECTORY icons/  DESTINATION ${CMAKE_INSTALL_ICONDIR})
  install(DIRECTORY macros/ DESTINATION ${CMAKE_INSTALL_MACRODIR})
  install(DIRECTORY man/    DESTINATION ${CMAKE_INSTALL_MANDIR})
  install(DIRECTORY test/      DESTINATION ${CMAKE_INSTALL_TESTDIR} COMPONENT tests)
  install(DIRECTORY tutorials/ DESTINATION ${CMAKE_INSTALL_TUTDIR} COMPONENT tests)
  install(DIRECTORY cmake/modules DESTINATION ${CMAKE_INSTALL_CMAKEDIR} PATTERN "Find*.cmake" EXCLUDE)
  install(FILES build/misc/root.m4 DESTINATION ${CMAKE_INSTALL_ACLOCALDIR})
endif()

#---Configure Testing using CTest----------------------------------------------------------------
configure_file(${CMAKE_SOURCE_DIR}/cmake/modules/CTestCustom.cmake ${CMAKE_BINARY_DIR} COPYONLY)
if(testing)
  if(gnuinstall)
    message(FATAL_ERROR "You cannot enable to run the tests in the build directory (testing=ON) and at the same time select a GNU style installation (gnuinstall=ON). This is because the code is built with the final installation location (CMAKE_INSTALL_PREFIX) for many ancillary files (tutorials, etc, icons, macros, etc.) and these are not available before installation. Tests can be run against the installation once is completed. See the instructions in the web")
  endif()
  include(RootCTest)
  if(roottest)
    find_package(Git REQUIRED)
    execute_process(COMMAND ${GIT_EXECUTABLE} rev-parse --abbrev-ref HEAD
                    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
                    OUTPUT_VARIABLE GIT_BRANCH OUTPUT_STRIP_TRAILING_WHITESPACE)
    #---Is the roottest source directory around?
    if(IS_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/roottest)
      set(roottestdir ${CMAKE_CURRENT_SOURCE_DIR}/roottest)
    elseif(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/../roottest)
      get_filename_component(roottestdir ${CMAKE_CURRENT_SOURCE_DIR}/../roottest ABSOLUTE)
    endif()
    if(roottestdir)
      file(REMOVE_RECURSE ${CMAKE_CURRENT_BINARY_DIR}/roottest)
      add_subdirectory(${roottestdir} roottest)
    else()
      message("-- Could not find roottest directory! Cloning from the repository...")
      execute_process(COMMAND ${GIT_EXECUTABLE} clone -b ${GIT_BRANCH} http://root.cern.ch/git/roottest.git
                      WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
      add_subdirectory(roottest)
    endif()
  endif()
endif()

#---Packaging-------------------------------------------------------------------------------------
include(RootCPack)