cmake_minimum_required (VERSION 2.6.4)

include (CheckFunctionExists)
include (CheckCSourceCompiles)
include (CheckCXXSourceCompiles)
include (CheckIncludeFile)

project(FlightGear)

# We have some custom .cmake scripts not in the official distribution.
set(CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/CMakeModules;${CMAKE_MODULE_PATH}")

if(${CMAKE_VERSION} VERSION_GREATER 2.8.4)
    # use official include provided by latest CMake
    include(GNUInstallDirs)
else(${CMAKE_VERSION} VERSION_GREATER 2.8.4)
    # backward compatibility: use our own module for older cmake versions
    include(OldGNUInstallDirs)
endif(${CMAKE_VERSION} VERSION_GREATER 2.8.4)

set(CMAKE_DEBUG_POSTFIX "d" CACHE STRING "add a postfix, usually d on windows")
set(CMAKE_RELEASE_POSTFIX "" CACHE STRING "add a postfix, usually empty on windows")
set(CMAKE_RELWITHDEBINFO_POSTFIX "" CACHE STRING "add a postfix, usually empty on windows")
set(CMAKE_MINSIZEREL_POSTFIX "" CACHE STRING "add a postfix, usually empty on windows")

# read 'version' file into a variable (stripping any newlines or spaces)
file(READ version versionFile)
string(STRIP ${versionFile} FLIGHTGEAR_VERSION) 

#packaging
if(EXISTS ${PROJECT_SOURCE_DIR}/.gitignore)
    file(READ .gitignore CPACK_SOURCE_IGNORE_FILES)
else()
    # clean tar-balls do not contain SCM (.git/.gitignore/...) files.
    set(CPACK_SOURCE_IGNORE_FILES
      "^${PROJECT_SOURCE_DIR}/.git;\\\\.gitignore;Makefile.am;~$;${CPACK_SOURCE_IGNORE_FILES}")
endif()

# split version string into components, note CMAKE_MATCH_0 is the entire regexp match
string(REGEX MATCH "([0-9]+)\\.([0-9]+)\\.([0-9]+)" CPACK_PACKAGE_VERSION ${FLIGHTGEAR_VERSION} )
set(CPACK_PACKAGE_VERSION_MAJOR ${CMAKE_MATCH_1}) 
set(CPACK_PACKAGE_VERSION_MINOR ${CMAKE_MATCH_2})
set(CPACK_PACKAGE_VERSION_PATCH ${CMAKE_MATCH_3})
SET(CPACK_RESOURCE_FILE_LICENSE "${PROJECT_SOURCE_DIR}/COPYING")
SET(CPACK_RESOURCE_FILE_README "${PROJECT_SOURCE_DIR}/README")

set(CPACK_SOURCE_GENERATOR TBZ2 ZIP)
set(CPACK_SOURCE_PACKAGE_FILE_NAME "flightgear-${FLIGHTGEAR_VERSION}" CACHE INTERNAL "tarball basename")

include (CPack)

if (FG_DATA_DIR)
    message(STATUS "Using explicit data-dir: ${FG_DATA_DIR}")
else()
    set(FG_DATA_DIR "${CMAKE_INSTALL_PREFIX}/lib/FlightGear" CACHE PATH "Default location where data files are located")
    message(STATUS "Using default data-dir:  ${FG_DATA_DIR}")
endif()

# Change the default build type to something fast
if(NOT CMAKE_BUILD_TYPE)
  set(CMAKE_BUILD_TYPE Release CACHE STRING
      "Choose the type of build, options are: None Debug Release RelWithDebInfo MinSizeRel."
      FORCE)
endif(NOT CMAKE_BUILD_TYPE)

if($ENV{BUILD_ID})
	set(HUDSON_BUILD_ID $ENV{BUILD_ID})
	set(HUDSON_BUILD_NUMBER $ENV{BUILD_NUMBER})
	message(STATUS "running under Hudson, build-number is ${HUDSON_BUILD_NUMBER}")
else()
	set(HUDSON_BUILD_NUMBER 0)
	set(HUDSON_BUILD_ID "none")
endif()

IF(APPLE)
    set(EVENT_INPUT_DEFAULT 1)
    
    find_library(CORESERVICES_LIBRARY CoreServices)
    find_library(COCOA_LIBRARY Cocoa)
    list(APPEND PLATFORM_LIBS ${COCOA_LIBRARY} ${CORESERVICES_LIBRARY})

elseif(CMAKE_SYSTEM_NAME MATCHES "Linux")
    # disabled while DBus / HAL / udev issues are decided
    #set(EVENT_INPUT_DEFAULT 1)
endif()

find_package(Git)
if (GIT_FOUND)
	execute_process(COMMAND git --git-dir ${PROJECT_SOURCE_DIR}/.git rev-parse  HEAD
		OUTPUT_VARIABLE REVISION
		OUTPUT_STRIP_TRAILING_WHITESPACE)
	message(STATUS "Git revision is ${REVISION}")
else()
	set(REVISION "none")
endif()

option(LOGGING "Set to OFF to build FlightGear without logging" ON)

option(SP_FDMS "Set to ON to build FlightGear with special-purpose FDMs" OFF)
option(ENABLE_UIUC_MODEL "Set to ON to build FlightGear with UIUCModel FDM" OFF)
option(ENABLE_LARCSIM "Set to ON to build FlightGear with LaRCsim FDM" OFF)
option(ENABLE_YASIM "Set to ON to build FlightGear with YASIM FDM" ON)
option(ENABLE_JSBSIM "Set to ON to build FlightGear with JSBSim FDM" ON)
option(ENABLE_FGADMIN "Set to ON to build FlightGear with FGADMIN" ON)
option(EVENT_INPUT "Set to ON to build FlightGear with event-based Input support" ${EVENT_INPUT_DEFAULT})
option(ENABLE_LIBSVN "Set to ON to build FlightGear/terrasync with libsvnclient support" ON)
option(ENABLE_RTI "Set to ON to build SimGear with RTI support" OFF)
option(WITH_FGPANEL "Set to ON to build the fgpanel application" ON)
option(JPEG_FACTORY "Enable JPEG-factory support" OFF)

if (MSVC)
  GET_FILENAME_COMPONENT(PARENT_DIR ${PROJECT_SOURCE_DIR} PATH)
  if (CMAKE_CL_64)
    SET(TEST_3RDPARTY_DIR "${PARENT_DIR}/3rdparty.x64")
  else (CMAKE_CL_64)
    SET(TEST_3RDPARTY_DIR "${PARENT_DIR}/3rdparty")
  endif (CMAKE_CL_64)
  if (EXISTS ${TEST_3RDPARTY_DIR})
    set(MSVC_3RDPARTY_ROOT ${PARENT_DIR} CACHE PATH "Location where the third-party dependencies are extracted")
  else (EXISTS ${TEST_3RDPARTY_DIR})
    set(MSVC_3RDPARTY_ROOT NOT_FOUND CACHE PATH "Location where the third-party dependencies are extracted")
  endif (EXISTS ${TEST_3RDPARTY_DIR})
  list(APPEND PLATFORM_LIBS "winmm.lib")
else (MSVC)
  set(MSVC_3RDPARTY_ROOT NOT_FOUND CACHE PATH "Location where the third-party dependencies are extracted")
endif (MSVC)

if(LOGGING)
	# nothing
else()
	set(FG_NDEBUG 1)
endif()

if(SP_FDMS)
	set(ENABLE_SP_FDM 1)
endif()

if (MSVC AND MSVC_3RDPARTY_ROOT)
  message(STATUS "3rdparty files located in ${MSVC_3RDPARTY_ROOT}")
  set( OSG_MSVC "msvc" )
  if (${MSVC_VERSION} EQUAL 1600)
      set( OSG_MSVC ${OSG_MSVC}100 )
  else (${MSVC_VERSION} EQUAL 1600)
      set( OSG_MSVC ${OSG_MSVC}90 )
  endif (${MSVC_VERSION} EQUAL 1600)
  if (CMAKE_CL_64)
      set( OSG_MSVC ${OSG_MSVC}-64 )
	  set( MSVC_3RDPARTY_DIR 3rdParty.x64 )
  else (CMAKE_CL_64)
	  set( MSVC_3RDPARTY_DIR 3rdParty )
  endif (CMAKE_CL_64)

  set (CMAKE_LIBRARY_PATH ${MSVC_3RDPARTY_ROOT}/${MSVC_3RDPARTY_DIR}/lib ${MSVC_3RDPARTY_ROOT}/install/${OSG_MSVC}/OpenScenegraph/lib ${MSVC_3RDPARTY_ROOT}/install/${OSG_MSVC}/SimGear/lib )
  set (CMAKE_INCLUDE_PATH ${MSVC_3RDPARTY_ROOT}/${MSVC_3RDPARTY_DIR}/include ${MSVC_3RDPARTY_ROOT}/install/${OSG_MSVC}/OpenScenegraph/include ${MSVC_3RDPARTY_ROOT}/install/${OSG_MSVC}/SimGear/include)
  set (BOOST_ROOT ${MSVC_3RDPARTY_ROOT}/boost_1_44_0)
  set (OPENAL_INCLUDE_DIR ${MSVC_3RDPARTY_ROOT}/${MSVC_3RDPARTY_DIR}/include)
  set (ALUT_INCLUDE_DIR ${MSVC_3RDPARTY_ROOT}/${MSVC_3RDPARTY_DIR}/include)
  set (OPENAL_LIBRARY_DIR ${MSVC_3RDPARTY_ROOT}/${MSVC_3RDPARTY_DIR}/lib)
endif (MSVC AND MSVC_3RDPARTY_ROOT)

if(EVENT_INPUT)
	message(STATUS "checking event-based Input")
	
	IF(APPLE)

	elseif(CMAKE_SYSTEM_NAME MATCHES "Linux")
        find_package(DBus)
        if(NOT DBUS_FOUND)
            message(WARNING "DBus not found, event input will be disabled")
            set(EVENT_INPUT 0)
        endif()
        
	else()
		message(WARNING "event input is not supported on this platform yet")
	endif()
else(EVENT_INPUT)
	set(ENABLE_PLIB_JOYSTICK 1)
endif(EVENT_INPUT)

# check required dependencies
find_package(Boost REQUIRED)
find_package(ZLIB REQUIRED)
find_package(Threads REQUIRED)
find_package(OpenGL REQUIRED)
find_package(OpenAL REQUIRED)
find_package(ALUT REQUIRED)
find_package(OpenSceneGraph 3.0.0 REQUIRED osgText osgSim osgDB osgParticle osgFX osgUtil osgViewer osgGA)

if(ENABLE_FGADMIN)
  find_package(FLTK)
endif(ENABLE_FGADMIN)

if(ENABLE_LIBSVN)
	find_package(SvnClient)
	
	if(LIBSVN_FOUND)
		message(STATUS "libsvn found, enabling in terrasync")
		set(HAVE_SVN_CLIENT_H 1)
		set(HAVE_LIBSVN_CLIENT_1 1)
	endif(LIBSVN_FOUND)
endif(ENABLE_LIBSVN)

find_package(PLIB REQUIRED puaux pu js fnt)
find_package(SimGear 2.5.0 REQUIRED)

if (JPEG_FACTORY)
    # check simgear was built with JPEG-factory support
    find_package(JPEG REQUIRED)
    include_directories(${JPEG_INCLUDE_DIR})
    
    set(CMAKE_REQUIRED_INCLUDES 
        ${SIMGEAR_INCLUDE_DIR} 
        ${JPEG_INCLUDE_DIR} 
        ${OPENSCENEGRAPH_INCLUDE_DIRS})
        
    check_cxx_source_compiles(
        "#include <simgear/screen/jpgfactory.hxx>
        int main()    { return 0; } "
        FG_JPEG_SERVER)
        
    if (NOT FG_JPEG_SERVER)
        message(STATUS "JPEG server support requested, but SimGear was built without JPEG support")
    endif()
endif()

check_include_file(unistd.h HAVE_UNISTD_H)
check_include_file(sys/time.h HAVE_SYS_TIME_H)
check_include_file(windows.h HAVE_WINDOWS_H)

# definition depends on OSG version
set(CMAKE_REQUIRED_INCLUDES ${OPENSCENEGRAPH_INCLUDE_DIRS})

check_cxx_source_compiles(
    "#include <osg/CullSettings>
    int main()
    {
       osg::CullSettings::VariablesMask mask = osg::CullSettings::CLEAR_MASK;
       return 0;
    }
    "
    HAVE_CULLSETTINGS_CLEAR_MASK)

if(ENABLE_RTI)
    find_package(RTI)
    if(RTI_FOUND)
        set(FG_HAVE_HLA 1)
    endif(RTI_FOUND)
endif(ENABLE_RTI)

if(CMAKE_COMPILER_IS_GNUCXX)
    set(WARNING_FLAGS -Wall)
endif(CMAKE_COMPILER_IS_GNUCXX)

if(WIN32)

    if(MSVC)
        # turn off various warnings
        # foreach(warning 4244 4251 4267 4275 4290 4786 4305 4996)
        #     SET(WARNING_FLAGS "${WARNING_FLAGS} /wd${warning}")
        # endforeach(warning)
        
        set(MSVC_FLAGS "-DNOMINMAX -D_USE_MATH_DEFINES -D_CRT_SECURE_NO_WARNINGS -D_SCL_SECURE_NO_WARNINGS -D__CRT_NONSTDC_NO_WARNINGS")
        if (${MSVC_VERSION} EQUAL 1600)
		  set( MSVC_LD_FLAGS "/FORCE:MULTIPLE" )
        endif (${MSVC_VERSION} EQUAL 1600)
    endif(MSVC)

    set(NOMINMAX 1)
endif(WIN32)    

set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${WARNING_FLAGS} ${MSVC_FLAGS} -D_REENTRANT")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${WARNING_FLAGS} ${MSVC_FLAGS} -D_REENTRANT")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${MSVC_LD_FLAGS}")

include_directories(${OPENSCENEGRAPH_INCLUDE_DIRS}
	${Boost_INCLUDE_DIRS}
	${ZLIB_INCLUDE_DIR}
	${ALUT_INCLUDE_DIR}
	${OPENAL_INCLUDE_DIR}
	${SIMGEAR_INCLUDE_DIR}
	${PLIB_INCLUDE_DIR} )

include_directories(${PROJECT_SOURCE_DIR}/src)

# following is needed, because config.h is include 'bare', whereas
# version.h is included as <Include/version.h> - this should be cleaned up
include_directories(${PROJECT_BINARY_DIR}/src)
include_directories(${PROJECT_BINARY_DIR}/src/Include)

add_definitions(-DHAVE_CONFIG_H)

check_function_exists(mkfifo HAVE_MKFIFO)

# configure a header file to pass some of the CMake settings
# to the source code
configure_file (
  "${PROJECT_SOURCE_DIR}/src/Include/config_cmake.h.in"
  "${PROJECT_BINARY_DIR}/src/Include/config.h"
  )

#and the same for the version header
configure_file (
  "${PROJECT_SOURCE_DIR}/src/Include/version.h.cmake-in"
  "${PROJECT_BINARY_DIR}/src/Include/version.h"
  ) 

add_subdirectory(src)
add_subdirectory(utils)
add_subdirectory(man)

set (INSTALL_DOCS 
	README
	README.OpenAL
	README.plib
	README.OSG
	README.SimGear)

INSTALL(FILES ${INSTALL_DOCS} DESTINATION ${CMAKE_INSTALL_DOCDIR} OPTIONAL)

#-----------------------------------------------------------------------------
### uninstall target
#-----------------------------------------------------------------------------
CONFIGURE_FILE(
  "${CMAKE_CURRENT_SOURCE_DIR}/CMakeModules/cmake_uninstall.cmake.in"
  "${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake"
  IMMEDIATE @ONLY)
ADD_CUSTOM_TARGET(uninstall
  "${CMAKE_COMMAND}" -P "${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake")