cmake_minimum_required (VERSION 3.0)

if(COMMAND cmake_policy)
   if(POLICY CMP0054)
       cmake_policy(SET CMP0054 NEW)
   endif()
   if(POLICY CMP0042)
       cmake_policy(SET CMP0042 NEW)
   endif()
   if(POLICY CMP0071)
       cmake_policy(SET CMP0071 NEW)
   endif()
endif()

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

# let's use & require C++17 - note these are only functional with CMake 3.1
# we do manual fallbacks for CMake 3.0 in the compilers section
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED YES)

project(TerraGear)

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

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")

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

# 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: Debug Release RelWithDebInfo MinSizeRel"
      FORCE)
endif(NOT CMAKE_BUILD_TYPE)

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})
else (MSVC)
  set(MSVC_3RDPARTY_ROOT)
endif (MSVC)

if (MSVC AND NOT MSVC_3RDPARTY_ROOT STREQUAL "NOT_FOUND")
  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)
  
  find_path(BOOST_ROOT boost/version.hpp
			${MSVC_3RDPARTY_ROOT}/boost
			${MSVC_3RDPARTY_ROOT}/boost_1_52_0
			${MSVC_3RDPARTY_ROOT}/boost_1_51_0
			${MSVC_3RDPARTY_ROOT}/boost_1_50_0
			${MSVC_3RDPARTY_ROOT}/boost_1_49_0
			${MSVC_3RDPARTY_ROOT}/boost_1_48_0
			${MSVC_3RDPARTY_ROOT}/boost_1_47_0
			${MSVC_3RDPARTY_ROOT}/boost_1_46_1
			${MSVC_3RDPARTY_ROOT}/boost_1_46_0
			${MSVC_3RDPARTY_ROOT}/boost_1_45_0
			${MSVC_3RDPARTY_ROOT}/boost_1_44_0
			)

  message(STATUS "BOOST_ROOT is ${BOOST_ROOT}")
  
  if (CMAKE_CL_64)
	  set( BOOST_LIBRARYDIR "${BOOST_ROOT}/lib64" )
  else (CMAKE_CL_64)
	  set( BOOST_LIBRARYDIR "${BOOST_ROOT}/lib" )
  endif (CMAKE_CL_64)
  
  set (Boost_USE_STATIC_LIBS 1)
  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 NOT MSVC_3RDPARTY_ROOT STREQUAL "NOT_FOUND")

# CGAL will reset Boost_LIBRARIES, so ensure we do this first to avoid breaking boost linking
set (CGAL_MINIMUM 4.0)
set (CGAL_OLD 0)
find_package(CGAL COMPONENTS Core REQUIRED)
if (CGAL_FOUND)
	if(${CGAL_MAJOR_VERSION}.${CGAL_MINOR_VERSION} VERSION_LESS ${CGAL_MINIMUM})
        message(FATAL_ERROR "CGAL >= ${CGAL_MINIMUM} is required. Found CGAL ${CGAL_MAJOR_VERSION}.${CGAL_MINOR_VERSION}")
	else(${CGAL_MAJOR_VERSION}.${CGAL_MINOR_VERSION} VERSION_LESS ${CGAL_MINIMUM})
        message(STATUS "Found CGAL ${CGAL_MAJOR_VERSION}.${CGAL_MINOR_VERSION}")
		if(${CGAL_MAJOR_VERSION}.${CGAL_MINOR_VERSION} VERSION_LESS 4.5)
			set (CGAL_OLD 1)
		endif()
	endif(${CGAL_MAJOR_VERSION}.${CGAL_MINOR_VERSION} VERSION_LESS ${CGAL_MINIMUM})

	include ( ${CGAL_USE_FILE} )
endif (CGAL_FOUND)

# check required dependencies
find_package(Boost COMPONENTS system thread REQUIRED)
find_package(ZLIB 1.2.9 REQUIRED)
find_package(Threads REQUIRED)
find_package(SimGear 2020.1.0 REQUIRED)
find_package(GDAL 2.0.0 REQUIRED)
find_package(TIFF REQUIRED) # needed for SRTM

if (CMAKE_CL_64)
	find_package(JPEG) # needed for SRTM
endif (CMAKE_CL_64)

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)

check_function_exists (rint HAVE_RINT)

set(PKGDATADIR ${CMAKE_INSTALL_PREFIX}/share/TerraGear)

if(CMAKE_COMPILER_IS_GNUCXX)
    set(WARNING_FLAGS -Wall)

    if (CMAKE_VERSION VERSION_LESS 3.1)
       set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14")
    endif()
elseif (MSVC AND CMAKE_VERSION VERSION_LESS 3.1)
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /std=c++14")
endif()

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 -DNO_TIMER")
        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} ${MSVC_FLAGS} -D_REENTRANT -DNO_OPENSCENEGRAPH_INTERFACE")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${MSVC_LD_FLAGS}")

include_directories(
	${Boost_INCLUDE_DIRS}
	${ZLIB_INCLUDE_DIR}
	${SIMGEAR_INCLUDE_DIR}
	)

add_definitions(-DHAVE_CONFIG_H)

include_directories(${PROJECT_SOURCE_DIR}/src)
include_directories(${PROJECT_BINARY_DIR}/src)
include_directories(${PROJECT_BINARY_DIR}/src/Include)

# 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"
  )
# create a version.h file
configure_file (
  "${PROJECT_SOURCE_DIR}/src/Include/version.h.cmake-in"
  "${PROJECT_BINARY_DIR}/src/Include/version.h"
  )

add_subdirectory(src)
#add_subdirectory(gismodules)

#-----------------------------------------------------------------------------
### 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")