###############
# ATDNA Build #
###############

# Force this binary to Release flags (to make MSVC happy)
if(MSVC)
set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_RELEASE}")
set(CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_RELEASE}")
endif()

# Find dependencies
include(FindLLVM.cmake)
if(NOT LLVM_FOUND)
    message(STATUS "Unable to locate LLVM installation; skipping atdna")
else()
list(APPEND LLVM_LIBS
     clangFrontend
     clangTooling
     clangDriver
     clangSerialization
     clangParse
     clangSema
     clangAnalysis
     clangEdit
     clangAST
     clangLex
     clangBasic
     LLVMCore
     LLVMOption
     LLVMMCParser
     LLVMBitReader
     LLVMMC
     LLVMProfileData
     LLVMSupport)

string(FIND ${LLVM_VERSION_STRING} "svn" SVN_FILTER_IDX)
if(NOT SVN_FILTER_IDX EQUAL -1)
   string(SUBSTRING ${LLVM_VERSION_STRING} 0 ${SVN_FILTER_IDX} LLVM_VERSION_BASE)
else()
   set(LLVM_VERSION_BASE ${LLVM_VERSION_STRING})
endif()

set(CLANG_INCLUDE_DIR ${LLVM_LIBRARY_DIRS}/clang/${LLVM_VERSION_BASE}/include
    CACHE PATH "Clang include dir" FORCE)

if(UNIX)
list(APPEND PLAT_LIBS z pthread curses)
if (APPLE)
    list(APPEND PLAT_LIBS dl)
elseif(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
    list(APPEND PLAT_LIBS dl)
endif()
endif()

# Offer the user the choice of overriding the installation directories
set(INSTALL_INCLUDE_DIR include CACHE PATH "Installation directory for header files")
set(INSTALL_BIN_DIR bin CACHE PATH "Installation directory for executables")
if(WIN32 AND NOT CYGWIN)
  set(INSTALL_CMAKE_DIR cmake)
else()
  set(INSTALL_CMAKE_DIR lib/cmake/atdna)
endif()

# Make relative paths absolute (needed later on)
foreach(p BIN INCLUDE CMAKE)
  set(var INSTALL_${p}_DIR)
  if(NOT IS_ABSOLUTE "${${var}}")
    set(ABS_${var} "${CMAKE_INSTALL_PREFIX}/${${var}}")
  else()
    set(ABS_${var} "${${var}}")
  endif()
endforeach()

# Windows resource
if(WIN32)
  configure_file(main.rc.in main.rc @ONLY)
  set(PLAT_SRCS ${CMAKE_CURRENT_BINARY_DIR}/main.rc)
endif()

# ATDNA target
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
include_directories(${LLVM_INCLUDE_DIRS})
link_directories(${LLVM_LIBRARY_DIRS})
add_executable(atdna main.cpp test.hpp ${PLAT_SRCS})
target_link_libraries(atdna ${LLVM_LIBS} ${PLAT_LIBS})
set_source_files_properties(main.cpp PROPERTIES COMPILE_DEFINITIONS 
                            "INSTALL_PREFIX=${ABS_INSTALL_BIN_DIR};__STDC_LIMIT_MACROS=1;__STDC_CONSTANT_MACROS=1")
if(MSVC)
set_target_properties(atdna PROPERTIES
                      COMPILE_FLAGS "/GR-")
else()
set_target_properties(atdna PROPERTIES
                      COMPILE_FLAGS "-std=c++11 -fno-rtti -Wno-unused-parameter"
                      LINK_FLAGS -std=c++11)
endif()

# Define installs
install(TARGETS atdna DESTINATION ${INSTALL_BIN_DIR} EXPORT atdnaTargets COMPONENT atdna)
install(DIRECTORY ${CLANG_INCLUDE_DIR}/ DESTINATION ${INSTALL_INCLUDE_DIR}/athena/clang COMPONENT atdna)

##################
# Package Export #
##################

# Add all targets to the build-tree export set
export(TARGETS atdna FILE "${PROJECT_BINARY_DIR}/atdnaTargets.cmake")

# Export the package for use from the build-tree
# (this registers the build-tree with a global CMake-registry)
export(PACKAGE atdna)

# Create the atdnaConfig.cmake
# ... for the build tree
set(CONF_CLANG_INCLUDE_DIR "${CLANG_INCLUDE_DIR}")
configure_file(atdnaConfig.cmake.in "${PROJECT_BINARY_DIR}/atdnaConfig.cmake" @ONLY)
# ... for the install tree
set(CONF_CLANG_INCLUDE_DIR "\${ATHENA_INCLUDE_DIR}/clang")
configure_file(atdnaConfig.cmake.in "${PROJECT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/atdnaConfig.cmake" @ONLY)
# ... for both
configure_file(atdnaConfigVersion.cmake.in "${PROJECT_BINARY_DIR}/atdnaConfigVersion.cmake" @ONLY)

# Install atdnaConfig.cmake
install(FILES
  "${PROJECT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/atdnaConfig.cmake"
  "${PROJECT_BINARY_DIR}/atdnaConfigVersion.cmake"
  DESTINATION ${INSTALL_CMAKE_DIR} COMPONENT atdna)

# Install the export set for use with the install-tree
install(EXPORT atdnaTargets DESTINATION ${INSTALL_CMAKE_DIR} COMPONENT atdna)

#########
# CTest #
#########

enable_testing()
add_test(NAME test-dna COMMAND $<TARGET_FILE:atdna> -o test.cpp 
         "-I${ATHENA_INCLUDE_DIR}" -isystem "${CLANG_INCLUDE_DIR}"
         ${CMAKE_SOURCE_DIR}/test.hpp)

endif()

#######################
# In-tree atdna macro #
#######################

# Super handy macro for adding atdna target
macro(atdna out)
  # Make input files source-relative
  set(ins "")
  foreach(arg ${ARGN})
    list(APPEND ins ${CMAKE_CURRENT_SOURCE_DIR}/${arg})
  endforeach()

  # Get local include directories for atdna
  get_property(incdirs DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} PROPERTY INCLUDE_DIRECTORIES)
  set(inccli "")
  foreach(dir ${incdirs})
    list(APPEND inccli "-I${dir}")
  endforeach()

  # Get local defines for atdna
  get_property(cdefs DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} PROPERTY COMPILE_DEFINITIONS)
  set(cdefcli "")
  foreach(def ${cdefs})
    list(APPEND cdefcli "-D${def}")
  endforeach()

  # MS extra
  unset(extraargs)
  if(MSVC)
    list(APPEND extraargs -fms-compatibility -fexceptions)
    if(MSVC_VERSION EQUAL 1800)
      list(APPEND extraargs -fms-compatibility-version=18.00)
    elseif(MSVC_VERSION EQUAL 1900)
      list(APPEND extraargs -fms-compatibility-version=19.00)
    endif()

  # OSX Extra
  elseif(APPLE)
    if (NOT EXISTS "${CMAKE_OSX_SYSROOT}")
      message(FATAL_ERROR "CMAKE_OSX_SYSROOT not set")
    endif()
    list(APPEND extraargs -isysroot ${CMAKE_OSX_SYSROOT} -I ${CMAKE_OSX_SYSROOT}/usr/include -isysroot
         ${CMAKE_OSX_SYSROOT}/../../../../../Toolchains/XcodeDefault.xctoolchain)
  endif()

  # Make target
  add_custom_command(OUTPUT ${out} COMMAND $<TARGET_FILE:atdna> 
                     ARGS ${extraargs} -o ${out} ${cdefcli} ${inccli} "-I${ATHENA_INCLUDE_DIR}"
                     -isystem "${CLANG_INCLUDE_DIR}" ${ins}
                     DEPENDS ${ins} COMMENT "Generating DNA ${out}")
endmacro()