#
# Setup
#

cmake_minimum_required(VERSION 2.8)

# Internal cmake modules
set(CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake/Modules)

include(CheckIncludeFiles)
include(CheckFunctionExists)
include(CheckLibraryExists)
include(CheckTypeSize)
include(CheckCSourceCompiles)
include(CheckCXXSourceCompiles)
include(CheckCSourceRuns)

include(CMakeMacroLibtoolFile)

project(tigervnc)
set(VERSION 1.1.91)

# The RC version must always be four comma-separated numbers
set(RCVERSION 1,1,91,0)

# Compatibility variables for the migration from autotools
add_definitions(-DPACKAGE_NAME="${CMAKE_PROJECT_NAME}")
add_definitions(-DPACKAGE_VERSION="${VERSION}")
add_definitions(-DLOCALEDIR="${CMAKE_INSTALL_PREFIX}/share/locale")

if(MSVC)
  message(FATAL_ERROR "TigerVNC cannot be built with Visual Studio.  Please use MinGW")
endif()

set(BUILD "")
execute_process(COMMAND "date" "+%Y%m%d" OUTPUT_VARIABLE BUILD)

if(NOT BUILD)
  set(BUILD "")
else()
  string(REGEX REPLACE "\n" "" BUILD ${BUILD})
endif()

# Default to optimised builds instead of debug ones. Our code has no bugs ;)
# (CMake makes it fairly easy to toggle this back to Debug if needed)
if(NOT CMAKE_BUILD_TYPE)
  set(CMAKE_BUILD_TYPE Release)
endif()

message(STATUS "CMAKE_BUILD_TYPE = ${CMAKE_BUILD_TYPE}")

if(CMAKE_BUILD_TYPE STREQUAL "Debug")
  set(BUILD "${BUILD}d")
endif()

message(STATUS "VERSION = ${VERSION}, BUILD = ${BUILD}")
add_definitions(-D__BUILD__="${BUILD}")

if(NOT DEFINED BUILD_WINVNC)
  set(BUILD_WINVNC 1)
endif()

# Minimum version is Windows 2000 (5.0)
if(WIN32)
  if(NOT CMAKE_SIZEOF_VOID_P MATCHES 8)
    add_definitions(-D_WIN32_IE=0x0500 -D_WIN32_WINNT=0x0500)
  else()
    set(WIN64 1)
    # Win64 doesn't like us requesting a Windows version that didn't have
    # 64-bit support. Request XP (5.1) instead.
    add_definitions(-D_WIN32_IE=0x0501 -D_WIN32_WINNT=0x0501)
  endif()
endif()

if(CMAKE_SIZEOF_VOID_P MATCHES 8)
  message(STATUS "64-bit build")
else()
  message(STATUS "32-bit build")
endif()

# This ensures that we don't depend on libstdc++ or libgcc
if(CMAKE_COMPILER_IS_GNUCXX AND NOT APPLE AND NOT CYGWIN)
  option(BUILD_STATIC
    "Link statically against libgcc and libstdc++, if possible" OFF)
  if(BUILD_STATIC)
    # For some reason, simply passing ${CMAKE_CXX_FLAGS} to the compiler in
    # execute_process() doesn't work.  Grrr...
    if(CMAKE_SIZEOF_VOID_P MATCHES 8)
      execute_process(COMMAND ${CMAKE_CXX_COMPILER} -m64
        --print-file-name=libstdc++.a OUTPUT_VARIABLE LIBSTDCPLUSPLUS
        RESULT_VARIABLE RESULT)
    else()
      execute_process(COMMAND ${CMAKE_CXX_COMPILER} -m32
        --print-file-name=libstdc++.a OUTPUT_VARIABLE LIBSTDCPLUSPLUS
        RESULT_VARIABLE RESULT)
    endif()
    string(REGEX REPLACE "\n" "" LIBSTDCPLUSPLUS ${LIBSTDCPLUSPLUS})
    if(RESULT MATCHES 0 AND LIBSTDCPLUSPLUS)
      message(STATUS "Linking with static libstdc++:\n   ${LIBSTDCPLUSPLUS}")
      file(MAKE_DIRECTORY ${CMAKE_BINARY_DIR}/staticlib)
      execute_process(COMMAND ${CMAKE_COMMAND} -E remove
        ${CMAKE_BINARY_DIR}/staticlib/libstdc++.a)
      if(MINGW)
        execute_process(COMMAND ${CMAKE_COMMAND} -E copy
          ${LIBSTDCPLUSPLUS} ${CMAKE_BINARY_DIR}/staticlib/libstdc++.a)
      else()
        execute_process(COMMAND ${CMAKE_COMMAND} -E create_symlink
          ${LIBSTDCPLUSPLUS} ${CMAKE_BINARY_DIR}/staticlib/libstdc++.a)
      endif()
      set(CMAKE_EXE_LINKER_FLAGS
        "${CMAKE_EXE_LINKER_FLAGS} -L${CMAKE_BINARY_DIR}/staticlib")
      set(CMAKE_SHARED_LINKER_FLAGS
        "${CMAKE_SHARED_LINKER_FLAGS} -L${CMAKE_BINARY_DIR}/staticlib")
    else()
      message(WARNING Cannot find static libstdc++.  TigerVNC will depend on dynamic libstdc++.)
    endif()
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -static-libgcc")
    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -static-libgcc")
    set(CMAKE_SHARED_LINKER_FLAGS
      "${CMAKE_SHARED_LINKER_FLAGS} -static-libgcc")
  endif()
endif()

# CMake doesn't properly support resource compilation with MinGW.  Boo!
if(MINGW)
  if(NOT DEFINED RC)
    set(CMAKE_RC_COMPILER_INIT windres)
  else()
    set(CMAKE_RC_COMPILER_INIT ${RC})
  endif()
  enable_language(RC)
  message(STATUS "Resource compiler: ${CMAKE_RC_COMPILER}")
  set(CMAKE_RC_COMPILE_OBJECT
    "<CMAKE_RC_COMPILER> <FLAGS> <DEFINES> -o <OBJECT> --output-format=coff <SOURCE>")
endif()

# MinGW64 has header support but no library support for IActiveDesktop, so we
# need to check for both the header and library and use our own implementation
# in common/os if either doesn't exist.
if(WIN32)
  check_c_source_compiles("#include <windows.h>\n#include <wininet.h>\n#include <shlobj.h>\nint main(int c, char** v) {IActiveDesktop iad; return 0;}" HAVE_ACTIVE_DESKTOP_H)
  check_c_source_compiles("#include <windows.h>\n#include <wininet.h>\n#include <shlobj.h>\nint main(int c, char** v) {GUID i = CLSID_ActiveDesktop; return 0;}" HAVE_ACTIVE_DESKTOP_L)
endif()

# X11 stuff. It's in a if() so that we can say REQUIRED
if(UNIX AND NOT APPLE)
  find_package(X11 REQUIRED)
endif()

# Check for zlib
find_package(ZLIB)
option(USE_INCLUDED_ZLIB "Force use of the bundled zlib")
if(NOT ZLIB_FOUND)
  set(USE_INCLUDED_ZLIB 1)
endif()
if(USE_INCLUDED_ZLIB)
  message(STATUS "Using included zlib library")
endif()

# Check for gettext
option(ENABLE_NLS "Enable translation of program messages" ON)
if(ENABLE_NLS)
  # Tools
  find_package(Gettext)
  set(LOCALE_DIR "${CMAKE_INSTALL_PREFIX}/share/locale")

  # Gettext needs iconv
  find_package(Iconv)

  if(ICONV_FOUND)
    # Headers and libraries (copied from licq)
    set(GETTEXT_FOUND FALSE)

    find_path(GETTEXT_INCLUDE_DIR libintl.h)
    if(GETTEXT_INCLUDE_DIR)
      set(CMAKE_REQUIRED_LIBRARIES ${ICONV_LIBRARIES})
      check_function_exists(dgettext LIBC_HAS_DGETTEXT)
      if(LIBC_HAS_DGETTEXT)
        set(GETTEXT_FOUND TRUE)
      else()
        find_library(LIBINTL_LIBRARY NAMES intl libintl)
        check_library_exists(${LIBINTL_LIBRARY} "dgettext" "" LIBINTL_HAS_DGETTEXT)
        if(LIBINTL_HAS_DGETTEXT)
          set(GETTEXT_LIBRARIES ${LIBINTL_LIBRARY} ${ICONV_LIBRARIES})
          set(GETTEXT_FOUND TRUE)
        endif()
      endif()
      set(CMAKE_REQUIRED_LIBRARIES)
    endif()
  endif()

  if(NOT GETTEXT_FOUND OR NOT ICONV_FOUND)
    message(WARNING "Gettext NOT found.  Native Language Support disabled.")
    set(ENABLE_NLS 0)
  endif()
endif()

# Check for libjpeg
find_package(JPEG REQUIRED)

# Warn if it doesn't seem to be the accelerated libjpeg that's found
set(CMAKE_REQUIRED_LIBRARIES ${JPEG_LIBRARIES})
set(CMAKE_REQUIRED_FLAGS -I${JPEG_INCLUDE_DIR})

set(JPEG_TEST_SOURCE "\n
  #include <stdio.h>\n
  #include <jpeglib.h>\n
  int main(void) {\n
    struct jpeg_compress_struct cinfo;\n
    struct jpeg_error_mgr jerr;\n
    cinfo.err=jpeg_std_error(&jerr);\n
    jpeg_create_compress(&cinfo);\n
    cinfo.input_components = 3;\n
    jpeg_set_defaults(&cinfo);\n
    cinfo.in_color_space = JCS_EXT_RGB;\n
    jpeg_default_colorspace(&cinfo);\n
    return 0;\n
  }")

if(CMAKE_CROSSCOMPILING)
  check_c_source_compiles("${JPEG_TEST_SOURCE}" FOUND_LIBJPEG_TURBO)
else()
  check_c_source_runs("${JPEG_TEST_SOURCE}" FOUND_LIBJPEG_TURBO)
endif()

set(CMAKE_REQUIRED_LIBRARIES)
set(CMAKE_REQUIRED_FLAGS)
set(CMAKE_REQUIRED_DEFINITIONS)

if(NOT FOUND_LIBJPEG_TURBO)
  message(STATUS "WARNING: You are not using libjpeg-turbo. Performance will suffer.")
endif()

option(BUILD_JAVA "Build Java version of the TigerVNC Viewer" FALSE)
if(BUILD_JAVA)
  add_subdirectory(java)
endif()

# Check for FLTK
set(FLTK_SKIP_FLUID TRUE)
set(FLTK_SKIP_OPENGL TRUE)
set(FLTK_SKIP_IMAGES TRUE)
set(FLTK_SKIP_FORMS TRUE)
find_package(FLTK)

if(UNIX AND NOT APPLE)
  # No proper handling for extra X11 libs that FLTK might need...
  if(X11_Xft_FOUND)
    set(FLTK_LIBRARIES ${FLTK_LIBRARIES} ${X11_Xft_LIB})
  else()
    message(FATAL_ERROR "Xft headers/libraries not found (needed by FLTK.)")
  endif()
  if(X11_Xinerama_FOUND)
    set(FLTK_LIBRARIES ${FLTK_LIBRARIES} ${X11_Xinerama_LIB})
  else()
    message(FATAL_ERROR "Xinerama headers/libraries not found (needed by FLTK.)")
  endif()
  if(X11_Xfixes_FOUND)
    set(FLTK_LIBRARIES ${FLTK_LIBRARIES} ${X11_Xfixes_LIB})
  else()
    message(FATAL_ERROR "Xfixes headers/libraries not found (needed by FLTK.)")
  endif()
  if(X11_Xcursor_FOUND)
    set(FLTK_LIBRARIES ${FLTK_LIBRARIES} ${X11_Xcursor_LIB})
  else()
    message(FATAL_ERROR "Xcursor headers/libraries not found (needed by FLTK.)")
  endif()
endif()

if(FLTK_FOUND)
  set(CMAKE_REQUIRED_INCLUDES ${FLTK_INCLUDE_DIR})
  set(CMAKE_REQUIRED_LIBRARIES ${FLTK_LIBRARIES})

  # FLTK STR #2599
  check_cxx_source_compiles("#include <FL/Fl_Widget.H>\nint main(int c, char** v) { void (Fl_Widget::*foo)() = &Fl_Widget::set_simple_keyboard; return 0; }" HAVE_FLTK_DEAD_KEYS)

  # FLTK STR #2636
  check_cxx_source_compiles("#include <FL/Fl.H>\nint main(int c, char** v) { Fl::add_clipboard_notify(NULL, NULL); return 0; }" HAVE_FLTK_CLIPBOARD)

  # FLTK STR #2638
  check_cxx_source_compiles("#include <FL/Enumerations.H>\nint main(int c, char** v) { return FL_Volume_Down; }" HAVE_FLTK_MEDIAKEYS)

  # FLTK STR #2641
  check_cxx_source_compiles("#include <FL/Enumerations.H>\nint main(int c, char** v) { return FL_FULLSCREEN; }" HAVE_FLTK_FULLSCREEN)

  # FLTK STR #2660
  check_cxx_source_compiles("#include <FL/Fl_Window.H>\nint main(int c, char** v) { void (Fl_Window::*foo)(const Fl_RGB_Image*,int,int) = &Fl_Window::cursor; return 0; }" HAVE_FLTK_CURSOR)

  set(CMAKE_REQUIRED_INCLUDES)
  set(CMAKE_REQUIRED_LIBRARIES)
endif()

option(USE_INCLUDED_FLTK
  "Force the use of the FLTK library bundled with the TigerVNC source")
if(NOT FLTK_FOUND OR NOT HAVE_FLTK_DEAD_KEYS OR NOT HAVE_FLTK_CLIPBOARD
  OR NOT HAVE_FLTK_MEDIAKEYS OR NOT HAVE_FLTK_FULLSCREEN
  OR NOT HAVE_FLTK_CURSOR)
  set(USE_INCLUDED_FLTK 1)
endif()
if(USE_INCLUDED_FLTK)
  set(HAVE_FLTK_DEAD_KEYS 1)
  set(HAVE_FLTK_CLIPBOARD 1)
  set(HAVE_FLTK_MEDIAKEYS 1)
  set(HAVE_FLTK_FULLSCREEN 1)
  set(HAVE_FLTK_CURSOR 1)
  set(FLTK_INCLUDE_DIR ${CMAKE_SOURCE_DIR}/common/fltk)
  set(FLTK_LIBRARIES)
  if(APPLE)
    set(FLTK_LIBRARIES "-framework Carbon -framework Cocoa -framework ApplicationServices")
  elseif(NOT WIN32)
    set(FLTK_LIBRARIES "-ldl")
  endif()
  message(STATUS "Using included FLTK library")
endif()

# Check for GNUTLS library
option(ENABLE_GNUTLS "Enable protocol encryption and advanced authentication" ON)
if(ENABLE_GNUTLS)
  find_package(GnuTLS)
  if (GNUTLS_FOUND)
    include_directories(${GNUTLS_INCLUDE_DIR})
    add_definitions("-DHAVE_GNUTLS")
    add_definitions(${GNUTLS_DEFINITIONS})
    
    # Detect old version of GnuTLS
    set(CMAKE_REQUIRED_FLAGS -I${GNUTLS_INCLUDE_DIR})
    set(CMAKE_EXTRA_INCLUDE_FILES gnutls/gnutls.h)
    set(CMAKE_REQUIRED_LIBRARIES ${GNUTLS_LIBRARIES})
    if(WIN32)
      set(CMAKE_EXTRA_INCLUDE_FILES gcrypt.h ${CMAKE_EXTRA_INCLUDE_FILES})
      set(CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES} ws2_32 user32)
    endif()
    if(ZLIB_FOUND)
      # When we build against the static version of GnuTLS, we also use the
      # included version of Zlib, but it isn't built yet, so we have to use the
      # system's version (if available) to perform this test.
      set(CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES};-lz)
    endif()
    check_function_exists(gnutls_transport_set_global_errno HAVE_OLD_GNUTLS)
    check_function_exists(gnutls_x509_crt_print HAVE_GNUTLS_X509_CRT_PRINT)
    check_type_size(gnutls_x509_crt_t GNUTLS_X509_CRT_T)
    check_type_size(gnutls_datum_t GNUTLS_DATUM_T)
    check_type_size(gnutls_pk_algorithm_t GNUTLS_PK_ALGORITHM_T)
    check_type_size(gnutls_sign_algorithm_t GNUTLS_SIGN_ALGORITHM_T)
    set(CMAKE_REQUIRED_FLAGS)
    set(CMAKE_EXTRA_INCLUDE_FILES) 
    set(CMAKE_REQUIRED_LIBRARIES)
  endif()
endif()

# Check for PAM library
option(ENABLE_PAM "Enable PAM authentication support" ON)
if(ENABLE_PAM)
  check_include_files(security/pam_appl.h HAVE_PAM_H)
  set(CMAKE_REQUIRED_LIBRARIES -lpam)
  check_function_exists(pam_start HAVE_PAM_START)
  set(CMAKE_REQUIRED_LIBRARIES)
  if(HAVE_PAM_H AND HAVE_PAM_START)
    set(PAM_LIBS pam)
  else()
    set(ENABLE_PAM 0)
  endif()
endif()
set(HAVE_PAM ${ENABLE_PAM})

# Check for socket functions
if(WIN32)
  set(CMAKE_EXTRA_INCLUDE_FILES winsock2.h ws2tcpip.h)
  set(CMAKE_REQUIRED_LIBRARIES ws2_32)
else()
  set(CMAKE_EXTRA_INCLUDE_FILES sys/socket.h)
endif()
check_function_exists(inet_aton HAVE_INET_ATON)
check_function_exists(inet_ntop HAVE_INET_NTOP)
check_type_size(socklen_t SOCKLEN_T)
set(CMAKE_EXTRA_INCLUDE_FILES) 
set(CMAKE_REQUIRED_LIBRARIES)

# Check for the newer standard string functions
check_function_exists(snprintf HAVE_SNPRINTF)
check_function_exists(strcasecmp HAVE_STRCASECMP)
check_function_exists(strncasecmp HAVE_STRNCASECMP)
check_function_exists(vsnprintf HAVE_VSNPRINTF)

# Generate config.h and make sure the source finds it
configure_file(config.h.in config.h)
add_definitions(-DHAVE_CONFIG_H)
include_directories(${CMAKE_BINARY_DIR})

add_subdirectory(common)

if(WIN32)
  add_subdirectory(win)
else()
  # No interest in building x related parts on Apple
  if(NOT APPLE)
    add_subdirectory(unix)
  endif()
endif()

if(ENABLE_NLS)
  add_subdirectory(po)
endif()
add_subdirectory(vncviewer)

include(cmake/BuildPackages.cmake)

# uninstall
configure_file("${CMAKE_SOURCE_DIR}/cmake/cmake_uninstall.cmake.in"
  "cmake_uninstall.cmake" IMMEDIATE @ONLY)

add_custom_target(uninstall COMMAND ${CMAKE_COMMAND} -P cmake_uninstall.cmake)