# Copyright 2015-present Samsung Electronics Co., Ltd. and other contributors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

cmake_minimum_required(VERSION 2.8)
include(CheckCCompilerFlag)

project(IOTJS C)

set(IOTJS_VERSION_MAJOR 1)
set(IOTJS_VERSION_MINOR 0)

if(NOT DEFINED TARGET_OS)
  string(TOLOWER ${CMAKE_SYSTEM_NAME} TARGET_OS)
  message(
    "TARGET_OS not specified, using '${TARGET_OS}' from CMAKE_SYSTEM_NAME")
endif()

if(NOT CMAKE_BUILD_TYPE)
  message("CMAKE_BUILD_TYPE was not set! Configuring for Debug build!")
  set(CMAKE_BUILD_TYPE Debug)
elseif("${CMAKE_BUILD_TYPE}" STREQUAL "Release")
  message("CMAKE_BUILD_TYPE was set to Release, switching to MinSizeRel")
  set(CMAKE_BUILD_TYPE MinSizeRel)
endif()

if(NOT DEFINED BUILD_LIB_ONLY)
  set(BUILD_LIB_ONLY OFF)
endif()

if(NOT DEFINED ENABLE_SNAPSHOT)
  message("Snapshot mode force enabled")
  set(ENABLE_SNAPSHOT ON)
endif()

if(NOT DEFINED ENABLE_LTO)
  message("LTO force disabled")
  set(ENABLE_LTO OFF)
endif()

macro(iotjs_add_flags VAR)
  foreach(_flag ${ARGN})
    set(${VAR} "${${VAR}} ${_flag}")
  endforeach()
endmacro()

macro(iotjs_add_compile_flags)
  iotjs_add_flags(CMAKE_C_FLAGS ${ARGV})
endmacro()

macro(iotjs_add_link_flags)
  iotjs_add_flags(IOTJS_LINKER_FLAGS ${ARGV})
endmacro()

macro(build_lib_name LIB_VAR NAME)
  set(${LIB_VAR}
      ${CMAKE_STATIC_LIBRARY_PREFIX}${NAME}${CMAKE_STATIC_LIBRARY_SUFFIX})
endmacro()

if(CMAKE_C_COMPILER_ID MATCHES "MSVC")
  set(USING_MSVC 1)
  set(CONFIG_TYPE $<$<CONFIG:Debug>:Debug>$<$<CONFIG:Release>:Release>)
  # disable warning C4820: 'x' bytes padding added after construct 'membername'
  iotjs_add_compile_flags(-wd4820)
endif()

CHECK_C_COMPILER_FLAG(-no-pie HAS_NO_PIE)

# Add buildtype-related flags
if("${CMAKE_BUILD_TYPE}" STREQUAL "Debug")
  iotjs_add_compile_flags(-DDEBUG -DENABLE_DEBUG_LOG)
  if(HAS_NO_PIE AND NOT "${TARGET_OS}" STREQUAL "darwin")
    iotjs_add_link_flags(-no-pie)
  endif()
else()
  iotjs_add_compile_flags(-fPIE)
  if("${TARGET_OS}" STREQUAL "darwin")
    iotjs_add_link_flags(-Wl,-pie)
  else()
    iotjs_add_link_flags(-pie)
  endif()
endif()

if (CREATE_SHARED_LIB)
  iotjs_add_compile_flags(-fPIC)
endif()

if(EXPERIMENTAL)
  iotjs_add_compile_flags(-DEXPERIMENTAL)
endif()

# Add arch-dependant flags
if("${TARGET_ARCH}" STREQUAL "arm")
  iotjs_add_compile_flags(-D__arm__ -mthumb -fno-short-enums -mlittle-endian)
elseif("${TARGET_ARCH}" STREQUAL "i686")
  iotjs_add_compile_flags(-D__i686__ -D__x86__)
  if(NOT USING_MSVC)
    iotjs_add_compile_flags(-march=i686 -m32)
  endif()
elseif("${TARGET_ARCH}" STREQUAL "x86_64")
  iotjs_add_compile_flags(-D__x86_64__)
elseif("${TARGET_ARCH}" STREQUAL "mips")
  message("MIPS support is experimental!")
  if(NOT EXPERIMENTAL)
    message(FATAL_ERROR "Missing --experimental build option for MIPS!")
  endif()

  if(ENABLE_SNAPSHOT)
    message(FATAL_ERROR "Cross endian snapshots are not supported. "
                        "Please disable snapshot mode for mips!")
  endif()
elseif("${TARGET_ARCH}" STREQUAL "noarch")
else()
  message(WARNING "Unknown target arch: ${TARGET_ARCH}.")
endif()

# Add board-dependant flags
iotjs_add_compile_flags(-DTARGET_BOARD=${TARGET_BOARD})

if("${TARGET_BOARD}" STREQUAL "artik05x")
  iotjs_add_compile_flags(-mcpu=cortex-r4 -mfpu=vfp3)
elseif("${TARGET_BOARD}" STREQUAL "artik10")
  iotjs_add_compile_flags(-mcpu=cortex-a7 -mfpu=neon-vfpv4 -mfloat-abi=softfp)
elseif("${TARGET_BOARD}" STREQUAL "rpi2")
  iotjs_add_compile_flags(-mcpu=cortex-a7 -mfpu=neon-vfpv4)
elseif("${TARGET_BOARD}" STREQUAL "rpi3")
  if("${TARGET_OS}" STREQUAL "tizen")
    iotjs_add_compile_flags(-mfpu=neon-vfpv4)
    endif()
elseif("${TARGET_BOARD}" STREQUAL "stm32f4dis")
  iotjs_add_compile_flags(-mcpu=cortex-m4 -march=armv7e-m -mfpu=fpv4-sp-d16)
  iotjs_add_compile_flags(-mfloat-abi=hard)
endif()

# Add os-dependant flags
if("${TARGET_OS}" STREQUAL "darwin")
  iotjs_add_compile_flags(-D__DARWIN__ -fno-builtin)
elseif("${TARGET_OS}" STREQUAL "linux")
  iotjs_add_compile_flags(-D__LINUX__ -fno-builtin)
  iotjs_add_link_flags(-pthread -rdynamic)
  iotjs_add_flags(EXTERNAL_LIBS m rt)
elseif("${TARGET_OS}" STREQUAL "nuttx")
  iotjs_add_compile_flags(-D__NUTTX__ -Os -fno-strict-aliasing)
  iotjs_add_compile_flags(-fno-strength-reduce -fomit-frame-pointer)
elseif("${TARGET_OS}" STREQUAL "tizen")
  iotjs_add_compile_flags(-D__TIZEN__ -fno-builtin)
  iotjs_add_link_flags(-pthread -rdynamic)
  iotjs_add_flags(EXTERNAL_LIBS m rt)
elseif("${TARGET_OS}" STREQUAL "tizenrt")
  iotjs_add_compile_flags(-D__TIZENRT__ -Os -fno-strict-aliasing)
  iotjs_add_compile_flags(-fno-strength-reduce -fomit-frame-pointer)
elseif("${TARGET_OS}" STREQUAL "windows")
  message("Windows support is experimental!")
  if(NOT EXPERIMENTAL)
    message(FATAL_ERROR "Missing --experimental build option for Windows!")
  endif()
elseif("${TARGET_OS}" STREQUAL "openwrt")
  message("OpenWrt support is experimental!")
  if(NOT EXPERIMENTAL)
    message(FATAL_ERROR "Missing --experimental build option for OpenWrt!")
  endif()

  iotjs_add_compile_flags(-D__OPENWRT__ -D_GNU_SOURCE)
  iotjs_add_link_flags(-pthread)
else()
  message(WARNING "Unknown target os: ${TARGET_OS}.")
endif()

# Add external options
if(DEFINED EXTERNAL_COMPILE_FLAGS)
  iotjs_add_compile_flags(${EXTERNAL_COMPILE_FLAGS})
endif()

if(DEFINED EXTERNAL_LINKER_FLAGS)
  iotjs_add_link_flags(${EXTERNAL_LINKER_FLAGS})
endif()

string(TOUPPER "${TARGET_OS}" TARGET_OS)

set(ROOT_DIR ${CMAKE_SOURCE_DIR})
set(ARCHIVE_DIR ${CMAKE_BINARY_DIR}/lib)

include(ExternalProject)

if(NOT ${EXTERNAL_LIBC_INTERFACE} STREQUAL "")
  iotjs_add_compile_flags(-isystem ${EXTERNAL_LIBC_INTERFACE})
endif()

# Include external projects
include(cmake/jerry.cmake)
include(cmake/http-parser.cmake)
include(cmake/libtuv.cmake)

include(cmake/iotjs.cmake)