include(CMakeDependentOption)

enable_language(C)
enable_language(CXX)

#-----------------------------------------------------------------------------
# Prerequisites
#-----------------------------------------------------------------------------
find_package(Subversion)
if(NOT Subversion_FOUND)
  message(WARNING "SVN may be needed to download external dependencies. Install SVN and try to re-configure")
endif()

find_package(Git)
if(NOT GIT_FOUND)
  message(WARNING "Git may be needed to download external dependencies: Install Git and try to re-configure")
endif()

option(USE_GIT_PROTOCOL "If behind a firewall turn this off to use http instead." ON)
if(NOT USE_GIT_PROTOCOL)
  set(git_protocol "http")
else(NOT USE_GIT_PROTOCOL)
  set(git_protocol "git")
endif()

# Platform check
#-----------------------------------------------------------------------------

set(PLATFORM_CHECK true)

if(PLATFORM_CHECK)
  # See CMake/Modules/Platform/Darwin.cmake)
  #   6.x == Mac OSX 10.2 (Jaguar)
  #   7.x == Mac OSX 10.3 (Panther)
  #   8.x == Mac OSX 10.4 (Tiger)
  #   9.x == Mac OSX 10.5 (Leopard)
  #  10.x == Mac OSX 10.6 (Snow Leopard)
  if (DARWIN_MAJOR_VERSION LESS "9")
    message(FATAL_ERROR "Only Mac OSX >= 10.5 are supported !")
  endif()
endif()

if( WIN32 )
  set( fileextension ".exe" )
endif()

option( BUILD_TESTING   "Build the testing tree" ON )

#-----------------------------------------------------------------------------
# Set a default build type if none was specified
#-----------------------------------------------------------------------------
if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
  message(STATUS "Setting build type to 'Release' as none was specified.")
  set(CMAKE_BUILD_TYPE Release CACHE STRING "Choose the type of build." FORCE)
  # Set the possible values of build type for cmake-gui
  set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "Debug" "Release" "MinSizeRel" "RelWithDebInfo")
endif()

#-----------------------------------------------------------------------------
# Update CMake module path
#------------------------------------------------------------------------------
set(CMAKE_MODULE_PATH
  ${CMAKE_CURRENT_SOURCE_DIR}/CMake
  ${CMAKE_CURRENT_BINARY_DIR}/CMake
  ${CMAKE_MODULE_PATH}
  )

#-----------------------------------------------------------------------------
# Sanity checks
#------------------------------------------------------------------------------
include(PreventInSourceBuilds)
include(PreventInBuildInstalls)
include(SlicerExtensionsConfigureMacros)
#-----------------------------------------------------------------------------
# CMake Function(s) and Macro(s)
#-----------------------------------------------------------------------------
include(CMakeParseArguments)



include(SlicerMacroEmptyExternalProject)
include(SlicerMacroCheckExternalProjectDependency)
include(ExternalProject)
if(CMAKE_EXTRA_GENERATOR)
  set(gen "${CMAKE_EXTRA_GENERATOR} - ${CMAKE_GENERATOR}")
else()
  set(gen "${CMAKE_GENERATOR}")
endif()
#-----------------------------------------------------------------------------
if(NOT COMMAND SETIFEMPTY)
  macro(SETIFEMPTY)
    set(KEY ${ARGV0})
    set(VALUE ${ARGV1})
    if(NOT ${KEY})
      set(${ARGV})
    endif()
  endmacro()
endif()
#-------------------------------------------------------------------------
# Augment compiler flags
#-------------------------------------------------------------------------
include(ITKSetStandardCompilerFlags)
if(CMAKE_BUILD_TYPE STREQUAL "Debug")
  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${C_DEBUG_DESIRED_FLAGS}" )
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CXX_DEBUG_DESIRED_FLAGS}" )
else() # Release, or anything else
  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${C_RELEASE_DESIRED_FLAGS}" )
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CXX_RELEASE_DESIRED_FLAGS}" )
endif()

#-----------------------------------------------------------------------------
# Add needed flag for gnu on linux like enviroments to build static common libs
# suitable for linking with shared object libs.
if(CMAKE_SYSTEM_PROCESSOR STREQUAL "x86_64")
  if(NOT "${CMAKE_CXX_FLAGS}" MATCHES "-fPIC")
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC")
  endif()
  if(NOT "${CMAKE_C_FLAGS}" MATCHES "-fPIC")
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
  endif()
endif()
