cmake_minimum_required(VERSION 3.5)
project(
  UTopia
  VERSION 0.2.0
  LANGUAGES C CXX
)

add_compile_definitions(UTOPIA_VERSION="${CMAKE_PROJECT_VERSION}")

if (NOT DEFINED LLVM_DIR)
  message(STATUS "NOT DEFINED LLVM_DIR, USE DEFAULT VALUE")
  set(LLVM_DIR /usr)
endif()
message(STATUS "LLVM_DIR: ${LLVM_DIR}")

list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules/")
list(APPEND CMAKE_MODULE_PATH "${LLVM_DIR}")

option(ENABLE_COV
    "Build with coverage instrumentation (Available only on debug build mode)"
    OFF)

set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
if(CMAKE_EXPORT_COMPILE_COMMANDS) # Verbose compile commands for clang-tools
  set(CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES ${CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES})
endif()
set(CMAKE_VERBOSE_MAKEFILE ON)

if (NOT CMAKE_BUILD_TYPE)
  message(STATUS "Build type is not set. Using debug as default.")
  set(CMAKE_BUILD_TYPE debug)
endif()

# TODO: Support release build after ensuring error handling without assert
# macros inside.
string(TOLOWER "${CMAKE_BUILD_TYPE}" CMAKE_BUILD_TYPE)
if (NOT "${CMAKE_BUILD_TYPE}" STREQUAL "debug")
  message(STATUS "Only debug build is available. Continue as debug build.")
endif()
set(CMAKE_BUILD_TYPE debug)

set(CMAKE_CXX_STANDARD 17)

# Compatibility for old protobuf versions
add_compile_options("-DGOOGLE_PROTOBUF_NO_RTTI")

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Werror -fno-rtti")
set(CMAKE_CXX_FLAGS_DEBUG
    "${CMAKE_CXX_FLAGS_DEBUG} ${CMAKE_CXX_FLAGS} -fno-omit-frame-pointer")
# do srtip binary if -DCMAKE_BUILD_TYPE=RELEASE
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -s")

# add flags for coverage instrumentation
if (ENABLE_COV)
  set(CMAKE_CXX_FLAGS_DEBUG
      "${CMAKE_CXX_FLAGS_DEBUG} -fprofile-arcs -ftest-coverage")
endif()

# change output directory
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}/bin")
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}/lib")
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}/lib")

############## LLVM CONFIGURATION #################
find_package(LLVM REQUIRED CONFIG HINTS ${LLVM_DIR})
message(STATUS "Found LLVM ${LLVM_PACKAGE_VERSION}")
message(STATUS "Using LLVMConfig.cmake in: ${LLVM_DIR}")

if(LLVM_VERSION_MAJOR VERSION_GREATER_EQUAL 17)
llvm_map_components_to_libnames(REQ_LLVM_LIBRARIES ${LLVM_TARGETS_TO_BUILD}
  Core Support Irreader Passes Option FrontendOpenMP Coverage ObjCARCOpts
  Coroutines LTO Analysis ScalarOpts TransformUtils
  ExecutionEngine WindowsDriver
)
else()
llvm_map_components_to_libnames(REQ_LLVM_LIBRARIES ${LLVM_TARGETS_TO_BUILD}
  Core Support Irreader Passes Option FrontendOpenMP Coverage ObjCARCOpts
  Coroutines LTO Analysis ScalarOpts TransformUtils
)
endif()

# ADD the CMake features provided by LLVM:
list(APPEND CMAKE_MODULE_PATH "${LLVM_CMAKE_DIR}")
include(AddLLVM)

option(LLVM_ENABLE_CXX1Y  "Enable C++1Y" ON)
option(LLVM_INCLUDE_TOOLS "Generate build targets for the LLVM tools." ON)
option(LLVM_BUILD_TOOLS
  "Build the LLVM tools. If OFF, just generate build targets." ON)

find_package(Clang REQUIRED)

message("LLVM STATUS:
  Definitions ${LLVM_DEFINITIONS}
  Includes    ${LLVM_INCLUDE_DIRS}
  Libraries   ${LLVM_LIBRARY_DIRS}
  LLVM_CMAKE_DIR: ${LLVM_CMAKE_DIR}
  AddLLVM: ${LIBRARY_OUTPUT_PATH}")

# SET the LLVM header and library paths:
include_directories(SYSTEM ${LLVM_INCLUDE_DIRS})
link_directories(${LLVM_LIBRARY_DIRS})
add_definitions(${LLVM_DEFINITIONS})

############## FINAL PROJECT CONFIG #################
# External dependencies
add_subdirectory(external)

# And the project header and library paths
include_directories(${CMAKE_SOURCE_DIR}/include)
link_directories(${LIBRARY_OUTPUT_PATH})

add_subdirectory(lib)
add_subdirectory(tools)

# Unit test
include(CTest)
if(BUILD_TESTING)
  add_subdirectory(tests)
endif()