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

if(NOT CMAKE_CROSSCOMPILING)

# 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()
find_library(LLVMDEMANGLE_LIB LLVMDemangle HINTS "${LLVM_ROOT_DIR}/lib")
find_library(LLVMBINARYFORMAT_LIB LLVMBinaryFormat HINTS "${LLVM_ROOT_DIR}/lib")
if (NOT LLVMDEMANGLE_LIB)
    set(LLVMDEMANGLE_LIB "")
endif()
if (NOT LLVMBINARYFORMAT_LIB)
    set(LLVMBINARYFORMAT_LIB "")
endif()
list(APPEND LLVM_LIBS
     clangFrontend
     clangTooling
     clangDriver
     clangSerialization
     clangParse
     clangSema
     clangAnalysis
     clangEdit
     clangAST
     clangLex
     clangBasic
     LLVMCore
     LLVMOption
     LLVMMCParser
     LLVMBitReader
     ${LLVMBINARYFORMAT_LIB}
     LLVMMC
     LLVMProfileData
     LLVMSupport
     ${LLVMDEMANGLE_LIB})

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 tinfo)
  endif()
elseif(WIN32)
  list(APPEND PLAT_LIBS Version)
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
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 "-fno-rtti -Wno-unused-parameter")
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 "${CMAKE_CURRENT_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 "${CLANG_INCLUDE_DIR}")
configure_file(atdnaConfig.cmake.in "${CMAKE_CURRENT_BINARY_DIR}/atdnaConfig.cmake" @ONLY)
# ... for the install tree
set(CONF_CLANG_INCLUDE_DIR "\${ATHENA_INCLUDE_DIR}/clang")
configure_file(atdnaConfig.cmake.in "${CMAKE_CURRENT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/atdnaConfig.cmake" @ONLY)
# ... for both
configure_file(atdnaConfigVersion.cmake.in "${CMAKE_CURRENT_BINARY_DIR}/atdnaConfigVersion.cmake" @ONLY)

# Install atdnaConfig.cmake
install(FILES
  "${CMAKE_CURRENT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/atdnaConfig.cmake"
  "${CMAKE_CURRENT_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)
  # Ninja wants invocations in root binary dir for DEPFILE application
  file(RELATIVE_PATH out_rel ${CMAKE_BINARY_DIR} "${CMAKE_CURRENT_BINARY_DIR}/${out}")

  # Make input files source-relative
  set(ins "")
  set(ins_impdeps "")
  foreach(arg ${ARGN})
    list(APPEND ins ${CMAKE_CURRENT_SOURCE_DIR}/${arg})
    list(APPEND ins_impdeps CXX)
    list(APPEND ins_impdeps ${CMAKE_CURRENT_SOURCE_DIR}/${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 ${cdefs})
    if(def MATCHES "^WINAPI_FAMILY.*")
      continue() # C++/CX gives clang a stomach ache
    endif()
    list(APPEND cdefcli "-D${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)
    elseif(MSVC_VERSION EQUAL 1910)
      list(APPEND extraargs -fms-compatibility-version=19.10)
    elseif(MSVC_VERSION EQUAL 1911)
      list(APPEND extraargs -fms-compatibility-version=19.11)
  endif()

  # OSX Extra
  elseif(APPLE)
    get_filename_component(COMPILER_DIR "${CMAKE_CXX_COMPILER}" DIRECTORY)
    if (NOT EXISTS "${CMAKE_OSX_SYSROOT}")
      message(FATAL_ERROR "CMAKE_OSX_SYSROOT not set")
    endif()
    list(APPEND extraargs
         -isysroot ${CMAKE_OSX_SYSROOT}
         -isysroot ${CMAKE_OSX_SYSROOT}/usr/include
         -I ${COMPILER_DIR}/../..
         -I ${COMPILER_DIR}/../include/c++/v1)
  endif()

  # Make target
  if(${CMAKE_GENERATOR} STREQUAL "Ninja")
    # Use Ninja's DEPFILE parser in cooperation with atdna
    add_custom_command(OUTPUT ${out} COMMAND $<TARGET_FILE:atdna>
                       ARGS ${extraargs} -o ${out_rel} -MD -MT ${out_rel} -MF ${out_rel}.d ${cdefcli} ${inccli}
                       "-I${ATHENA_INCLUDE_DIR}" -isystem "${CLANG_INCLUDE_DIR}" ${ins}
                       DEPENDS atdna ${ins} IMPLICIT_DEPENDS ${ins_impdeps}
                       DEPFILE "${CMAKE_CURRENT_BINARY_DIR}/${out}.d"
                       WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
                       COMMENT "Generating DNA ${out_rel}")
  else()
    # Use CMake's built-in dependency scanner for makefile targets
    add_custom_command(OUTPUT ${out} COMMAND $<TARGET_FILE:atdna>
                       ARGS ${extraargs} -o ${out_rel} ${cdefcli} ${inccli}
                       "-I${ATHENA_INCLUDE_DIR}" -isystem "${CLANG_INCLUDE_DIR}" ${ins}
                       DEPENDS atdna ${ins} IMPLICIT_DEPENDS ${ins_impdeps}
                       WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
                       COMMENT "Generating DNA ${out_rel}")
  endif()
endmacro()

endif()