##############################################################################
#
# medInria
#
# Copyright (c) INRIA 2013 - 2019. All rights reserved.
# See LICENSE.txt for details.
# 
#  This software is distributed WITHOUT ANY WARRANTY; without even
#  the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
#  PURPOSE.
#
################################################################################

## #############################################################################
## Add common different types of path for all external-projects
## #############################################################################
include(CMakeDependentOption)

set(ep_prefix_comment      "A root directory used to compute other non-specified cmake paths of externals projects")
set(ep_path_base_comment   "Specifies the common part of the build and source paths of externals projects")
set(ep_dir_name_comment    "Directory name of external-projects")
set(ep_path_source_comment "Sources path of the externals projects")
set(ep_path_build_comment  "Build path of the Externals projects")

option(EP_CHECKBOX_CUSTOM_DIRS  "Allow to specify manually paths of externals projects " OFF)
CMAKE_DEPENDENT_OPTION(EP_CHECKBOX_SIDE_BY_SIDE "Put build source and build directories of externals projects side by side" OFF "NOT EP_CHECKBOX_CUSTOM_DIRS" OFF)
CMAKE_DEPENDENT_OPTION(EP_CHECKBOX_ON_TOP_LEVEL "Put directory of externals projects at the same level of the application" ON "NOT EP_CHECKBOX_CUSTOM_DIRS" OFF)

macro(ep_change_garde var )
  if(NOT "${${var}_PREVIOUS}" STREQUAL "${${var}}")
    set(${var}_PREVIOUS "${${var}}" CACHE INTERNAL "" FORCE)
    set(${var}_change ON CACHE INTERNAL "" FORCE)
  else()
    set(${var}_change OFF CACHE INTERNAL "" FORCE)
  endif()
endmacro()

function(setOnTop)
  set(EP_PREFIX "${EP_PATH_BASE}" CACHE INTERNAL "" FORCE)
  if(EP_CHECKBOX_SIDE_BY_SIDE)
    set(EP_PATH_SOURCE "${EP_PATH_BASE}"                    CACHE FILEPATH ${ep_path_source_comment} FORCE)
    unset(EP_PATH_BUILD CACHE)
  else()
    set(EP_PATH_SOURCE "${EP_PATH_BASE}/src"                CACHE FILEPATH ${ep_path_source_comment} FORCE)
    set(EP_PATH_BUILD  "${EP_PATH_BASE}/build"              CACHE FILEPATH ${ep_path_build_comment}  FORCE)
  endif()
endfunction()

function(setOnSrcDir)
  set(EP_PREFIX "${CMAKE_SOURCE_DIR}/${EP_DIR_NAME}" CACHE INTERNAL ${ep_prefix_comment} FORCE)
  if(EP_CHECKBOX_SIDE_BY_SIDE)
    set(EP_PATH_SOURCE "${CMAKE_SOURCE_DIR}/${EP_DIR_NAME}" CACHE FILEPATH ${ep_path_source_comment} FORCE)
    unset(EP_PATH_BUILD CACHE)
  else()
    set(EP_PATH_SOURCE "${CMAKE_SOURCE_DIR}/${EP_DIR_NAME}" CACHE FILEPATH ${ep_path_source_comment} FORCE)
    set(EP_PATH_BUILD  "${CMAKE_BINARY_DIR}/${EP_DIR_NAME}" CACHE FILEPATH ${ep_path_build_comment}  FORCE)
  endif()
endfunction()


set(EP_CHECKBOX_ON_TOP_LEVEL_change OFF CACHE INTERNAL "" FORCE)
set(EP_CHECKBOX_SIDE_BY_SIDE_change OFF CACHE INTERNAL "" FORCE)
set(EP_PATH_BASE_change             OFF CACHE INTERNAL "" FORCE)
set(EP_DIR_NAME_change              OFF CACHE INTERNAL "" FORCE)

ep_change_garde(EP_CHECKBOX_ON_TOP_LEVEL)
ep_change_garde(EP_CHECKBOX_SIDE_BY_SIDE)
if(EP_CHECKBOX_CUSTOM_DIRS)
  if(EP_CHECKBOX_ON_TOP_LEVEL_change)
    unset(EP_PATH_BASE CACHE)
    unset(EP_DIR_NAME  CACHE)
    set(EP_PREFIX      "${CMAKE_SOURCE_DIR}/ExtProjs" CACHE FILEPATH ${ep_prefix_comment}      FORCE)
    set(EP_PATH_SOURCE "${CMAKE_SOURCE_DIR}/ExtProjs" CACHE FILEPATH ${ep_path_source_comment} FORCE)
    set(EP_PATH_BUILD  "${CMAKE_BINARY_DIR}/ExtProjs" CACHE FILEPATH ${ep_path_build_comment}  FORCE)
    endif()
else()
  if(EP_CHECKBOX_ON_TOP_LEVEL)
    if(EP_CHECKBOX_ON_TOP_LEVEL_change)
      unset(EP_DIR_NAME CACHE)
	  unset(EP_DIR_NAME_PREVIOUS CACHE)
      set(EP_PATH_BASE "${CMAKE_SOURCE_DIR}_ExtProjs" CACHE FILEPATH ${ep_path_base_comment}   FORCE)
    endif()
    ep_change_garde(EP_PATH_BASE)
    if(EP_PATH_BASE_change OR EP_CHECKBOX_SIDE_BY_SIDE_change)
      setOnTop()
    endif()
  else()
    if(EP_CHECKBOX_ON_TOP_LEVEL_change)
      unset(EP_PATH_BASE CACHE)
	  unset(EP_PATH_BASE_PREVIOUS CACHE)
      set(EP_DIR_NAME  "ExtProjs"                    CACHE FILEPATH ${ep_dir_name_comment}     FORCE)
    endif()
    ep_change_garde(EP_DIR_NAME)
    if(EP_DIR_NAME_change OR EP_CHECKBOX_SIDE_BY_SIDE_change)
      setOnSrcDir()
    endif()
  endif()
endif()

function(epComputPath ep)
  if(DEFINED EP_PATH_BUILD)
    set(build_path "${EP_PATH_BUILD}/${ep}" PARENT_SCOPE)
    set(tmp_path   "${EP_PATH_BUILD}/tmp/${ep}" PARENT_SCOPE)
    set(stamp_path "${EP_PATH_BUILD}/Stamp/${ep}" PARENT_SCOPE)
  else()
    set(build_path "${EP_PATH_SOURCE}/${ep}-build" PARENT_SCOPE)
    set(tmp_path   "${EP_PATH_SOURCE}/tmp" PARENT_SCOPE )
    set(stamp_path "${EP_PATH_SOURCE}/${ep}-stamp" PARENT_SCOPE)
  endif()
endfunction()


## #############################################################################
## Add common variables for all external-projects
## #############################################################################

set(EP_INSTALL_PREFIX ${SDK_DIR}/dependencies CACHE INTERNAL "") 
mark_as_advanced(EP_INSTALL_PREFIX)

set(ep_common_c_flags 
  "${CMAKE_C_FLAGS} ${CMAKE_C_FLAGS_INIT} ${ADDITIONAL_C_FLAGS}"
  )

set(ep_common_cxx_flags 
  "${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_INIT} ${ADDITIONAL_CXX_FLAGS}"
  )

set(ep_common_shared_linker_flags
  "${CMAKE_SHARED_LINKER_FLAGS} ${CMAKE_SHARED_LINKER_FLAGS_INIT} ${ADDITIONAL_SHARED_LINKER_FLAGS}"
  )

set(ep_common_cache_args
  -DCMAKE_C_COMPILER:=${CMAKE_C_COMPILER}
  -DCMAKE_CXX_COMPILER:=${CMAKE_CXX_COMPILER}
  -DCMAKE_MAKE_PROGRAM=${CMAKE_MAKE_PROGRAM}
  -DCMAKE_CXX_STANDARD:STRING=${CMAKE_CXX_STANDARD}
  -DCMAKE_DEBUG_POSTFIX:STRING=d
  )

if(${SDK_GENERATION})
  set(EP_INSTAL_COMMAND "")
else()
  list(APPEND EP_INSTAL_COMMAND 
  INSTALL_COMMAND
  "")
endif()

if(CMAKE_EXTRA_GENERATOR)
  set(gen "${CMAKE_EXTRA_GENERATOR} -G ${CMAKE_GENERATOR}")
else()
  set(gen "${CMAKE_GENERATOR}")
endif()

if(${USE_GITHUB_SSH})
  set(GITHUB_PREFIX git@github.com:)
else()
  set(GITHUB_PREFIX https://github.com/)
endif()

if(${USE_GITLAB_INRIA_SSH})
  set(GITLAB_INRIA_PREFIX git@gitlab.inria.fr:)
else()
  set(GITLAB_INRIA_PREFIX https://gitlab.inria.fr/)
endif()

SET(BUILD_ALWAYS_TIPS_TEXT BUILD_ALWAYS "Enabling this option forces the build step to always be run. This can be the easiest way to robustly ensure that the external project's own build dependencies are evaluated rather than relying on the default success timestamp-based method. This option is not normally needed unless developers are expected to modify something the external project's build depends on in a way that is not detectable via the step target dependencies")
option(EP_BUILD_ALWAYS  "${BUILD_ALWAYS_TIPS_TEXT}" OFF)

## #############################################################################
## Include cmake modules of external-project
## #############################################################################

include(ExternalProject) 

## #############################################################################
## Include common configuration steps
## #############################################################################

include(EP_Initialisation)
include(EP_GeneratePatchCommand) 

## #############################################################################
## Include specific module of each project
## #############################################################################

file(GLOB projects_modules ${CMAKE_SOURCE_DIR}/superbuild/projects_modules/*.cmake)

foreach(module ${projects_modules})
    include(${module})
endforeach()

## #############################################################################
## Call specific module of each project
## #############################################################################

macro(call func_name)
    set(tmp_function_file ${CMAKE_CURRENT_BINARY_DIR}/tmp/tmp_call_ep.cmake)
    string(REPLACE "-" "_" func ${func_name})
    file(WRITE ${tmp_function_file} "${func}()")
    include(${tmp_function_file})
    file(REMOVE ${tmp_function_file})
endmacro()

foreach (external_project ${external_projects})
    call(${external_project}_project)
endforeach()