if (EXISTS ${CMAKE_SOURCE_DIR}/${CMAKE_PROJECT_NAME}.cmake)
  include (${CMAKE_SOURCE_DIR}/${CMAKE_PROJECT_NAME}.cmake)
endif ()

# prevent build in source directory
if ("${CMAKE_BINARY_DIR}" STREQUAL "${CMAKE_SOURCE_DIR}")
    message (SEND_ERROR "Building in the source directory is not supported.")
    message (FATAL_ERROR "Please remove the created \"CMakeCache.txt\" file, the \"CMakeFiles\" directory and create a build directory and call \"${CMAKE_COMMAND} <path to the sources>\".")
endif ("${CMAKE_BINARY_DIR}" STREQUAL "${CMAKE_SOURCE_DIR}")

# allow only Debug and Release builds
set (CMAKE_CONFIGURATION_TYPES "Debug;Release" CACHE STRING "" FORCE)
mark_as_advanced (CMAKE_CONFIGURATION_TYPES)

# set Debus as default build target
if (NOT CMAKE_BUILD_TYPE)
  set (CMAKE_BUILD_TYPE Debug CACHE STRING
      "Choose the type of build, options are: Debug, Release."
      FORCE)
endif ()

# create our output directroy
if (NOT EXISTS ${CMAKE_BINARY_DIR}/Build)
  file (MAKE_DIRECTORY ${CMAKE_BINARY_DIR}/Build)
endif ()

# read version from file
macro (acg_get_version)
    file (READ "${CMAKE_CURRENT_SOURCE_DIR}/VERSION" _file)
    string (
        REGEX REPLACE
        "^.*VERSION=([^\n]*).*$" "\\1"
        _version ${_file}
    )
    string (
        REGEX REPLACE
        "^.*MAJOR=([^\n]*).*$" "\\1"
        _major ${_file}
    )
    string (
        REGEX REPLACE
        "^.*MINOR=([^\n]*).*$" "\\1"
        _minor ${_file}
    )
    string (
        REGEX REPLACE
        "^.*PATCH=([^\n]*).*$" "\\1"
        _patch ${_file}
    )
    set (VERSION ${_version})
    set (VERSION_MAJOR ${_major})
    set (VERSION_MINOR ${_minor})
    set (VERSION_PATCH ${_patch})
endmacro ()


# set directory structures for the different platforms
if (WIN32)
  set (ACG_PROJECT_DATADIR ".")
  set (ACG_PROJECT_LIBDIR "lib")
  set (ACG_PROJECT_BINDIR ".")
  set (ACG_PROJECT_PLUGINDIR "Plugins")
  if (NOT EXISTS ${CMAKE_BINARY_DIR}/Build/${ACG_PROJECT_LIBDIR})
    file (MAKE_DIRECTORY ${CMAKE_BINARY_DIR}/Build/${ACG_PROJECT_LIBDIR})
  endif ()
else ()
  set (ACG_PROJECT_DATADIR "share/${CMAKE_PROJECT_NAME}")
  set (ACG_PROJECT_LIBDIR "lib/${CMAKE_PROJECT_NAME}")
  set (ACG_PROJECT_PLUGINDIR "lib/${CMAKE_PROJECT_NAME}/plugins")
  set (ACG_PROJECT_BINDIR "bin")
endif ()

# allow a project to modify the directories
if (COMMAND acg_modify_project_dirs)
  acg_modify_project_dirs ()
endif ()

# sets default build properties
macro (acg_set_target_props target)
  if (WIN32)
    set_target_properties (
      ${target} PROPERTIES
      BUILD_WITH_INSTALL_RPATH 1
      SKIP_BUILD_RPATH 0
    )
  elseif (APPLE AND NOT ACG_PROJECT_MACOS_BUNDLE)
    set_target_properties (
      ${target} PROPERTIES
      INSTALL_NAME_DIR "@executable_path/../lib/${CMAKE_PROJECT_NAME}"
      BUILD_WITH_INSTALL_RPATH 1
      SKIP_BUILD_RPATH 0
    )
  elseif (NOT APPLE)
    set_target_properties (
      ${target} PROPERTIES
      INSTALL_RPATH "$ORIGIN/../lib/${CMAKE_PROJECT_NAME}"
      BUILD_WITH_INSTALL_RPATH 1
      SKIP_BUILD_RPATH 0
      RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/Build/${ACG_PROJECT_BINDIR}"
      LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/Build/${ACG_PROJECT_LIBDIR}"
    )
  endif ()
endmacro ()

include (AddFileDependencies)
include (ACGCompiler)

# define INCLUDE_TEMPLATES for everything we build
add_definitions (-DINCLUDE_TEMPLATES)

# look for selected qt dependencies
macro (acg_qt4)
  if (NOT QT4_FOUND)
    find_package (Qt4 COMPONENTS QtCore QtGui ${ARGN})

    set (QT_USE_QTOPENGL 1)
    set (QT_USE_QTNETWORK 1)
    set (QT_USE_QTSCRIPT 1)
    set (QT_USE_QTSQL 1)
    set (QT_USE_QTXML 1)
    set (QT_USE_QTHELP 1)
    set (QT_USE_QTWEBKIT 1)
    set (QT_USE_QTUITOOLS 1)

    include (${QT_USE_FILE})
  endif ()
endmacro ()

# unsets the given variable
macro (acg_unset var)
    set (${var} "" CACHE INTERNAL "")
endmacro ()

# sets the given variable
macro (acg_set var value)
    set (${var} ${value} CACHE INTERNAL "")
endmacro ()

# test for OpenMP
macro (acg_openmp)
  if (NOT OPENMP_NOTFOUND)
    find_package(OpenMP)
    if (OPENMP_FOUND)
      set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
      set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS}")
      add_definitions(-DUSE_OPENMP)
    else ()
      set (OPENMP_NOTFOUND 1)
    endif ()
  endif ()
endmacro ()

# test for FTGL
macro (acg_ftgl)
  find_package (Freetype)

  if (FREETYPE_FOUND)
    find_package (FTGL)

    if (FTGL_FOUND)
      add_definitions (-DUSE_FTGL)
      include_directories (${FTGL_INCLUDE_DIR} ${FREETYPE_INCLUDE_DIR_freetype2})
      set (FTGL_LIBS ${FREETYPE_LIBRARIES} ${FTGL_LIBRARIES})
    endif ()
  endif ()
endmacro ()

# append all files with extension "ext" in the "dirs" directories to "ret"
macro (acg_append_files ret ext)
  foreach (_dir ${ARGN})
    file (GLOB _files "${_dir}/${ext}")
    list (APPEND ${ret} ${_files})
  endforeach ()
endmacro ()

# append all files with extension "ext" in the "dirs" directories and its subdirectories to "ret"
macro (acg_append_files_recursive ret ext)
  foreach (_dir ${ARGN})
    file (GLOB_RECURSE _files "${_dir}/${ext}")
    list (APPEND ${ret} ${_files})
  endforeach ()
endmacro ()

# drop all "*T.cc" files from list
macro (acg_drop_templates list)
  foreach (_file ${${list}})
    if (_file MATCHES "T.cc$")
      list (REMOVE_ITEM ${list} ${_file})
    endif ()
  endforeach ()
endmacro ()

# generate moc targets for sources in list
macro (acg_qt4_automoc moc_SRCS)
  qt4_get_moc_flags (_moc_INCS)

  set (_matching_FILES )
  foreach (_current_FILE ${ARGN})

     get_filename_component (_abs_FILE ${_current_FILE} ABSOLUTE)
     # if "SKIP_AUTOMOC" is set to true, we will not handle this file here.
     # here. this is required to make bouic work correctly:
     # we need to add generated .cpp files to the sources (to compile them),
     # but we cannot let automoc handle them, as the .cpp files don't exist yet when
     # cmake is run for the very first time on them -> however the .cpp files might
     # exist at a later run. at that time we need to skip them, so that we don't add two
     # different rules for the same moc file
     get_source_file_property (_skip ${_abs_FILE} SKIP_AUTOMOC)

     if ( NOT _skip AND EXISTS ${_abs_FILE} )

        file (READ ${_abs_FILE} _contents)

        get_filename_component (_abs_PATH ${_abs_FILE} PATH)

        string (REGEX MATCHALL "Q_OBJECT" _match "${_contents}")
        if (_match)
            get_filename_component (_basename ${_current_FILE} NAME_WE)
            set (_header ${_abs_FILE})
            set (_moc    ${CMAKE_CURRENT_BINARY_DIR}/moc_${_basename}.cpp)

            add_custom_command (OUTPUT ${_moc}
                COMMAND ${QT_MOC_EXECUTABLE}
                ARGS ${_moc_INCS} ${_header} -o ${_moc}
                DEPENDS ${_header}
            )

            add_file_dependencies (${_abs_FILE} ${_moc})
            set (${moc_SRCS} ${${moc_SRCS}} ${_moc})
            
        endif ()
     endif ()
  endforeach ()
endmacro ()

# generate uic targets for sources in list
macro (acg_qt4_autouic uic_SRCS)

  set (_matching_FILES )
  foreach (_current_FILE ${ARGN})

     get_filename_component (_abs_FILE ${_current_FILE} ABSOLUTE)

     if ( EXISTS ${_abs_FILE} )

        file (READ ${_abs_FILE} _contents)

        get_filename_component (_abs_PATH ${_abs_FILE} PATH)

        get_filename_component (_basename ${_current_FILE} NAME_WE)
        string (REGEX REPLACE "Ui$" "" _cbasename ${_basename})
        set (_outfile ${CMAKE_CURRENT_BINARY_DIR}/ui_${_basename}.hh)
        set (_header ${_basename}.hh)
        set (_source ${_abs_PATH}/${_cbasename}.cc)
        
        add_custom_command (OUTPUT ${_outfile}
            COMMAND ${QT_UIC_EXECUTABLE}
            ARGS -o ${_outfile} ${_abs_FILE}
            DEPENDS ${_abs_FILE})

        add_file_dependencies (${_source} ${_outfile})
        set (${uic_SRCS} ${${uic_SRCS}} ${_outfile})
            
     endif ()
  endforeach ()
endmacro ()

# get all files in directory, but ignore svn
macro (acg_get_files_in_dir ret dir)
  file (GLOB_RECURSE __files RELATIVE "${dir}" "${dir}/*")
  foreach (_file ${__files})
    if (NOT _file MATCHES ".*svn.*")
      list (APPEND ${ret} "${_file}")
    endif ()
  endforeach ()
endmacro ()

# copy the whole directory without svn files
function (acg_copy_after_build target src dst)
  acg_unset (_files)
  acg_get_files_in_dir (_files ${src})
  foreach (_file ${_files})
    add_custom_command(TARGET ${target} POST_BUILD
      COMMAND ${CMAKE_COMMAND} -E copy_if_different "${src}/${_file}" "${dst}/${_file}"
    )
  endforeach ()
endfunction ()

# install the whole directory without svn files
function (acg_install_dir src dst)
  acg_unset (_files)
  acg_get_files_in_dir (_files ${src})
  foreach (_file ${_files})
    get_filename_component (_file_PATH ${_file} PATH)
    install(FILES "${src}/${_file}"
      DESTINATION "${dst}/${_file_PATH}"
    )
  endforeach ()
endfunction ()

# extended version of add_executable that also copies output to out Build directory
function (acg_add_executable _target)
  add_executable (${_target} ${ARGN})

  # set common target properties defined in common.cmake
  acg_set_target_props (${_target})

  if (WIN32)
    # copy exe file to "Build" directory
    # Visual studio will create this file in a subdirectory so we can't use
    # RUNTIME_OUTPUT_DIRECTORY directly here
    add_custom_command (TARGET ${_target} POST_BUILD
                        COMMAND ${CMAKE_COMMAND} -E
                        copy_if_different
                          ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/${_target}.exe
                          ${CMAKE_BINARY_DIR}/Build/${ACG_PROJECT_BINDIR}/${_target}.exe)
  elseif (APPLE AND NOT ACG_PROJECT_MACOS_BUNDLE)
    add_custom_command (TARGET ${_target} POST_BUILD
                        COMMAND ${CMAKE_COMMAND} -E
                        copy_if_different
                          ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/${_target}
                          ${CMAKE_BINARY_DIR}/Build/${ACG_PROJECT_BINDIR}/${_target})
  endif ()
  if (NOT ACG_PROJECT_MACOS_BUNDLE OR NOT APPLE)
    install (TARGETS ${_target} DESTINATION ${ACG_PROJECT_BINDIR})
  endif ()
endfunction ()

# extended version of add_library that also copies output to out Build directory
function (acg_add_library _target _libtype)

  if (${_libtype} STREQUAL SHAREDANDSTATIC)
    set (_type SHARED)
    if (NOT WIN32)
      set (_and_static 1)
    else ()
      set (_and_static 0)
    endif ()    
  else ()
    set (_type ${_libtype})
    set (_and_static 0)
  endif ()

  add_library (${_target} ${_type} ${ARGN} )

#  acg_get_version()
#
#  set_target_properties (${_target} PROPERTIES VERSION    ${VERSION-MAJOR}.${VERSION-MINOR} 
#                                               SOVERSION  ${VERSION-MAJOR}.${VERSION-MINOR} )
#

  # set common target properties defined in common.cmake
  acg_set_target_props (${_target})

  if (_and_static)
    add_library (${_target}Static STATIC ${ARGN})

    # set common target properties defined in common.cmake
    acg_set_target_props (${_target}Static)
    
    if (NOT APPLE)
# todo : create correct so names
      set_target_properties (${_target}Static PROPERTIES 
                             LIBRARY_OUTPUT_DIRECTORY "${CMAKE_LIBRARY_OUTPUT_DIRECTORY}"
                            )

# todo : rename the lib to omit the static name extension
      install (TARGETS ${_target}Static
               RUNTIME DESTINATION ${ACG_PROJECT_BINDIR}
               LIBRARY DESTINATION ${ACG_PROJECT_LIBDIR}
               ARCHIVE DESTINATION ${ACG_PROJECT_LIBDIR} )

    endif ()
  endif ()

  if (WIN32)
    # copy exe file to "Build" directory
    # Visual studio will create this file in a subdirectory so we can't use
    # RUNTIME_OUTPUT_DIRECTORY directly here
    if (${_type} STREQUAL SHARED)
      add_custom_command (TARGET ${_target} POST_BUILD
                          COMMAND ${CMAKE_COMMAND} -E
                          copy_if_different
                            ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/${_target}.dll
                            ${CMAKE_BINARY_DIR}/Build/${ACG_PROJECT_BINDIR}/${_target}.dll)
    elseif (${_type} STREQUAL MODULE)
      if (NOT EXISTS ${CMAKE_BINARY_DIR}/Build/${ACG_PROJECT_PLUGINDIR})
        file (MAKE_DIRECTORY ${CMAKE_BINARY_DIR}/Build/${ACG_PROJECT_PLUGINDIR})
      endif ()
      add_custom_command (TARGET ${_target} POST_BUILD
                          COMMAND ${CMAKE_COMMAND} -E
                          copy_if_different
                            ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/${_target}.dll
                            ${CMAKE_BINARY_DIR}/Build/${ACG_PROJECT_PLUGINDIR}/${_target}.dll)
    endif ()
    if (${_type} STREQUAL SHARED OR ${_type} STREQUAL STATIC)
      add_custom_command (TARGET ${_target} POST_BUILD
                          COMMAND ${CMAKE_COMMAND} -E
                          copy_if_different
                            ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/${_target}.lib
                            ${CMAKE_BINARY_DIR}/Build/${ACG_PROJECT_LIBDIR}/${_target}.lib)
    endif ()
  elseif (APPLE AND NOT ACG_PROJECT_MACOS_BUNDLE)
    if (${_type} STREQUAL SHARED)
      add_custom_command (TARGET ${_target} POST_BUILD
                          COMMAND ${CMAKE_COMMAND} -E
                          copy_if_different
                            ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${_target}.dylib
                            ${CMAKE_BINARY_DIR}/Build/${ACG_PROJECT_LIBDIR}/lib${_target}.dylib)
    elseif (${_type} STREQUAL MODULE)
      if (NOT EXISTS ${CMAKE_BINARY_DIR}/Build/${ACG_PROJECT_PLUGINDIR})
        file (MAKE_DIRECTORY ${CMAKE_BINARY_DIR}/Build/${ACG_PROJECT_PLUGINDIR})
      endif ()
      add_custom_command (TARGET ${_target} POST_BUILD
                          COMMAND ${CMAKE_COMMAND} -E
                          copy_if_different
                            ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${_target}.so
                            ${CMAKE_BINARY_DIR}/Build/${ACG_PROJECT_PLUGINDIR}/lib${_target}.so)
    elseif (${_type} STREQUAL STATIC)
      add_custom_command (TARGET ${_target} POST_BUILD
                          COMMAND ${CMAKE_COMMAND} -E
                          copy_if_different
                            ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${_target}.a
                            ${CMAKE_BINARY_DIR}/Build/${ACG_PROJECT_LIBDIR}/lib${_target}.a)
    endif ()
    if (_and_static)
      add_custom_command (TARGET ${_target}Static POST_BUILD
                          COMMAND ${CMAKE_COMMAND} -E
                          copy_if_different
                            ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${_target}Static.a
                            ${CMAKE_BINARY_DIR}/Build/${ACG_PROJECT_LIBDIR}/lib${_target}.a)
    endif ()

  elseif (NOT APPLE AND _and_static)
      add_custom_command (TARGET ${_target}Static POST_BUILD
                          COMMAND ${CMAKE_COMMAND} -E
                          copy_if_different
                            ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${_target}Static.a
                            ${CMAKE_BINARY_DIR}/Build/${ACG_PROJECT_LIBDIR}/lib${_target}.a)

  endif ()
  
  if (NOT ACG_PROJECT_MACOS_BUNDLE OR NOT APPLE)
    if (${_type} STREQUAL SHARED OR ${_type} STREQUAL STATIC )
      install (TARGETS ${_target}
               RUNTIME DESTINATION ${ACG_PROJECT_BINDIR}
               LIBRARY DESTINATION ${ACG_PROJECT_LIBDIR}
               ARCHIVE DESTINATION ${ACG_PROJECT_LIBDIR})
    elseif (${_type} STREQUAL MODULE)
      install (TARGETS ${_target} DESTINATION ${ACG_PROJECT_PLUGINDIR})
    endif ()
  endif ()
endfunction ()