cmake_minimum_required(VERSION 3.13)
include(CheckFunctionExists)
include(CheckSymbolExists)

project(ucode C)
add_definitions(-Os -Wall -Werror --std=gnu99 -ffunction-sections -fwrapv -D_GNU_SOURCE)

if(CMAKE_C_COMPILER_VERSION VERSION_GREATER 6)
	add_definitions(-Wextra -Werror=implicit-function-declaration)
	add_definitions(-Wformat -Werror=format-security -Werror=format-nonliteral)
endif()

if(NOT CMAKE_C_FLAGS MATCHES -D_FORTIFY_SOURCE=)
	add_definitions(-D_FORTIFY_SOURCE=2)
endif()

add_definitions(-Wmissing-declarations -Wno-error=unused-variable -Wno-unused-parameter)

include_directories(include)

option(COMPILE_SUPPORT "Support compilation from source" ON)

if(NOT COMPILE_SUPPORT)
  add_definitions(-DNO_COMPILE)
endif()

find_library(libuci NAMES uci)
find_library(libubox NAMES ubox)
find_library(libubus NAMES ubus)
find_library(libblobmsg_json NAMES blobmsg_json)

if(LINUX)
  find_library(libnl_tiny NAMES nl-tiny)

  if(libnl_tiny AND libubox)
    set(DEFAULT_NL_SUPPORT ON)
  endif()
endif()

if(libuci AND libubox)
  set(DEFAULT_UCI_SUPPORT ON)
endif()

if(libubus AND libblobmsg_json)
  set(DEFAULT_UBUS_SUPPORT ON)
endif()

if(libubox)
  set(DEFAULT_ULOOP_SUPPORT ON)
endif()

option(DEBUG_SUPPORT "Debug plugin support" ON)
option(FS_SUPPORT "Filesystem plugin support" ON)
option(MATH_SUPPORT "Math plugin support" ON)
option(UBUS_SUPPORT "Ubus plugin support" ${DEFAULT_UBUS_SUPPORT})
option(UCI_SUPPORT "UCI plugin support" ${DEFAULT_UCI_SUPPORT})
option(RTNL_SUPPORT "Route Netlink plugin support" ${DEFAULT_NL_SUPPORT})
option(NL80211_SUPPORT "Wireless Netlink plugin support" ${DEFAULT_NL_SUPPORT})
option(RESOLV_SUPPORT "NS resolve plugin support" ON)
option(STRUCT_SUPPORT "Struct plugin support" ON)
option(ULOOP_SUPPORT "Uloop plugin support" ${DEFAULT_ULOOP_SUPPORT})
option(LOG_SUPPORT "Log plugin support" ON)
option(SOCKET_SUPPORT "Socket plugin support" ON)

set(LIB_SEARCH_PATH "${CMAKE_INSTALL_PREFIX}/lib/ucode/*.so:${CMAKE_INSTALL_PREFIX}/share/ucode/*.uc:./*.so:./*.uc" CACHE STRING "Default library search path")
string(REPLACE ":" "\", \"" LIB_SEARCH_DEFINE "${LIB_SEARCH_PATH}")
add_definitions(-DLIB_SEARCH_PATH="${LIB_SEARCH_DEFINE}")

if(APPLE)
  set(UCODE_MODULE_LINK_OPTIONS "LINKER:-undefined,dynamic_lookup")
  add_definitions(-DBIND_8_COMPAT)
else()
  set(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS "-Wl,--gc-sections")
endif()

if(DEBUG)
  add_definitions(-DDEBUG -g3 -Og)
else()
  add_definitions(-DNDEBUG)
endif()

include(FindPkgConfig)
pkg_check_modules(JSONC REQUIRED json-c)
include_directories(${JSONC_INCLUDE_DIRS})

set(UCODE_SOURCES lexer.c lib.c vm.c chunk.c vallist.c compiler.c source.c types.c program.c platform.c)
add_library(libucode SHARED ${UCODE_SOURCES})
set(SOVERSION 0 CACHE STRING "Override ucode library version")
set_target_properties(libucode PROPERTIES OUTPUT_NAME ucode SOVERSION ${SOVERSION})
target_link_libraries(libucode ${JSONC_LINK_LIBRARIES})

set(CLI_SOURCES main.c)
add_executable(ucode ${CLI_SOURCES})
target_link_libraries(ucode libucode ${JSONC_LINK_LIBRARIES})

check_function_exists(dlopen DLOPEN_FUNCTION_EXISTS)
if(NOT DLOPEN_FUNCTION_EXISTS)
  target_link_libraries(libucode dl)
endif()

check_function_exists(fmod FMOD_FUNCTION_EXISTS)
if(NOT FMOD_FUNCTION_EXISTS)
  target_link_libraries(libucode m)
endif()

list(APPEND CMAKE_REQUIRED_INCLUDES ${JSONC_INCLUDE_DIRS})
list(APPEND CMAKE_REQUIRED_LIBRARIES ${JSONC_LINK_LIBRARIES})
check_symbol_exists(json_tokener_get_parse_end "json-c/json.h" HAVE_PARSE_END)
if(HAVE_PARSE_END)
  add_definitions(-DHAVE_PARSE_END)
endif()
check_symbol_exists(json_object_new_array_ext "json-c/json.h" HAVE_ARRAY_EXT)
if(HAVE_ARRAY_EXT)
  add_definitions(-DHAVE_ARRAY_EXT)
endif()
check_symbol_exists(json_object_new_uint64 "json-c/json.h" HAVE_JSON_UINT64)
if(HAVE_JSON_UINT64)
  add_definitions(-DHAVE_JSON_UINT64)
endif()

set(LIBRARIES "")

if(DEBUG_SUPPORT)
  set(LIBRARIES ${LIBRARIES} debug_lib)
  add_library(debug_lib MODULE lib/debug.c)
  set_target_properties(debug_lib PROPERTIES OUTPUT_NAME debug PREFIX "")
  target_link_options(debug_lib PRIVATE ${UCODE_MODULE_LINK_OPTIONS})
  if(libubox)
    find_path(uloop_include_dir NAMES libubox/uloop.h)
    include_directories(${uloop_include_dir})
    target_link_libraries(debug_lib ${libubox} ${libucode})
    set_target_properties(debug_lib PROPERTIES COMPILE_DEFINITIONS HAVE_ULOOP)
  endif()
endif()

if(FS_SUPPORT)
  set(LIBRARIES ${LIBRARIES} fs_lib)
  add_library(fs_lib MODULE lib/fs.c)
  set_target_properties(fs_lib PROPERTIES OUTPUT_NAME fs PREFIX "")
  target_link_options(fs_lib PRIVATE ${UCODE_MODULE_LINK_OPTIONS})
endif()

if(MATH_SUPPORT)
  set(LIBRARIES ${LIBRARIES} math_lib)
  add_library(math_lib MODULE lib/math.c)
  set_target_properties(math_lib PROPERTIES OUTPUT_NAME math PREFIX "")
  target_link_options(math_lib PRIVATE ${UCODE_MODULE_LINK_OPTIONS})
  check_function_exists(ceil CEIL_FUNCTION_EXISTS)
  if(NOT CEIL_FUNCTION_EXISTS)
    target_link_libraries(math_lib m)
  endif()
endif()

if(UBUS_SUPPORT)
  find_path(ubus_include_dir NAMES libubus.h)
  include_directories(${ubus_include_dir})
  set(LIBRARIES ${LIBRARIES} ubus_lib)
  add_library(ubus_lib MODULE lib/ubus.c)
  set_target_properties(ubus_lib PROPERTIES OUTPUT_NAME ubus PREFIX "")
  target_link_options(ubus_lib PRIVATE ${UCODE_MODULE_LINK_OPTIONS})
  target_link_libraries(ubus_lib ${libubus} ${libblobmsg_json})
  list(APPEND CMAKE_REQUIRED_LIBRARIES ${libubox})
  file(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/test.c" "
    #include <libubus.h>
    int main() { return UBUS_STATUS_NO_MEMORY; }
  ")
  try_compile(HAVE_NEW_UBUS_STATUS_CODES
    ${CMAKE_BINARY_DIR}
    "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/test.c")
  check_symbol_exists(uloop_fd_set_cb "libubox/uloop.h" FD_SET_CB_EXISTS)
  if(HAVE_NEW_UBUS_STATUS_CODES)
    add_definitions(-DHAVE_NEW_UBUS_STATUS_CODES)
  endif()
  if(FD_SET_CB_EXISTS)
    target_compile_definitions(ubus_lib PUBLIC HAVE_ULOOP_FD_SET_CB)
  endif()
endif()

if(UCI_SUPPORT)
  find_path(uci_include_dir uci.h)
  include_directories(${uci_include_dir})
  set(LIBRARIES ${LIBRARIES} uci_lib)
  add_library(uci_lib MODULE lib/uci.c)
  set_target_properties(uci_lib PROPERTIES OUTPUT_NAME uci PREFIX "")
  target_link_options(uci_lib PRIVATE ${UCODE_MODULE_LINK_OPTIONS})
  target_link_libraries(uci_lib ${libuci} ${libubox})
endif()

if(RTNL_SUPPORT)
  find_path(nl_include_dir NAMES netlink/msg.h PATH_SUFFIXES libnl-tiny)
  include_directories(${nl_include_dir})
  set(LIBRARIES ${LIBRARIES} rtnl_lib)
  add_library(rtnl_lib MODULE lib/rtnl.c)
  set_target_properties(rtnl_lib PROPERTIES OUTPUT_NAME rtnl PREFIX "")
  target_link_options(rtnl_lib PRIVATE ${UCODE_MODULE_LINK_OPTIONS})
  target_link_libraries(rtnl_lib ${libnl_tiny} ${libubox})
endif()

if(NL80211_SUPPORT)
  find_path(nl_include_dir NAMES netlink/msg.h PATH_SUFFIXES libnl-tiny)
  include_directories(${nl_include_dir})
  set(LIBRARIES ${LIBRARIES} nl80211_lib)
  add_library(nl80211_lib MODULE lib/nl80211.c)
  set_target_properties(nl80211_lib PROPERTIES OUTPUT_NAME nl80211 PREFIX "")
  target_link_options(nl80211_lib PRIVATE ${UCODE_MODULE_LINK_OPTIONS})
  target_link_libraries(nl80211_lib ${libnl_tiny} ${libubox})
endif()

if(RESOLV_SUPPORT)
  set(LIBRARIES ${LIBRARIES} resolv_lib)
  add_library(resolv_lib MODULE lib/resolv.c)
  set_target_properties(resolv_lib PROPERTIES OUTPUT_NAME resolv PREFIX "")
  target_link_options(resolv_lib PRIVATE ${UCODE_MODULE_LINK_OPTIONS})
  check_function_exists(res_mkquery RES_MKQUERY_FUNCTION_EXISTS)
  check_function_exists(ns_initparse NS_INITARSE_FUNCTION_EXISTS)
  check_function_exists(clock_gettime CLOCK_GETTIME_FUNCTION_EXISTS)
  if(NOT RES_MKQUERY_FUNCTION_EXISTS OR NOT NS_INITARSE_FUNCTION_EXISTS)
    target_link_libraries(resolv_lib resolv)
  endif()
  if(NOT CLOCK_GETTIME_FUNCTION_EXISTS)
    target_link_libraries(resolv_lib rt)
  endif()
endif()

if(STRUCT_SUPPORT)
  set(LIBRARIES ${LIBRARIES} struct_lib)
  add_library(struct_lib MODULE lib/struct.c)
  set_target_properties(struct_lib PROPERTIES OUTPUT_NAME struct PREFIX "")
  target_link_options(struct_lib PRIVATE ${UCODE_MODULE_LINK_OPTIONS})
  check_function_exists(frexp FREXP_FUNCTION_EXISTS)
  if(NOT FREXP_FUNCTION_EXISTS)
    target_link_libraries(struct_lib m)
  endif()
endif()

if(ULOOP_SUPPORT)
  find_path(uloop_include_dir NAMES libubox/uloop.h)
  include_directories(${uloop_include_dir})
  set(LIBRARIES ${LIBRARIES} uloop_lib)
  add_library(uloop_lib MODULE lib/uloop.c)
  set_target_properties(uloop_lib PROPERTIES OUTPUT_NAME uloop PREFIX "")
  target_link_options(uloop_lib PRIVATE ${UCODE_MODULE_LINK_OPTIONS})
  list(APPEND CMAKE_REQUIRED_LIBRARIES ${libubox})
  check_function_exists(uloop_timeout_remaining64 REMAINING64_FUNCTION_EXISTS)
  check_function_exists(uloop_interval_set INTERVAL_FUNCTION_EXISTS)
  check_function_exists(uloop_signal_add SIGNAL_FUNCTION_EXISTS)
  if(REMAINING64_FUNCTION_EXISTS)
    target_compile_definitions(uloop_lib PUBLIC HAVE_ULOOP_TIMEOUT_REMAINING64)
  endif()
  if(INTERVAL_FUNCTION_EXISTS)
    target_compile_definitions(uloop_lib PUBLIC HAVE_ULOOP_INTERVAL)
  endif()
  if(SIGNAL_FUNCTION_EXISTS)
    target_compile_definitions(uloop_lib PUBLIC HAVE_ULOOP_SIGNAL)
  endif()
  target_link_libraries(uloop_lib ${libubox})
endif()

if(LOG_SUPPORT)
  set(LIBRARIES ${LIBRARIES} log_lib)
  add_library(log_lib MODULE lib/log.c)
  set_target_properties(log_lib PROPERTIES OUTPUT_NAME log PREFIX "")
  target_link_options(log_lib PRIVATE ${UCODE_MODULE_LINK_OPTIONS})
  if(libubox)
    find_path(ulog_include_dir NAMES libubox/ulog.h)
    include_directories(${ulog_include_dir})
    target_link_libraries(log_lib ${libubox})
    set_target_properties(log_lib PROPERTIES COMPILE_DEFINITIONS HAVE_ULOG)
  endif()
endif()

if(SOCKET_SUPPORT)
  set(LIBRARIES ${LIBRARIES} socket_lib)
  add_library(socket_lib MODULE lib/socket.c)
  set_target_properties(socket_lib PROPERTIES OUTPUT_NAME socket PREFIX "")
  target_link_options(socket_lib PRIVATE ${UCODE_MODULE_LINK_OPTIONS})
endif()

if(UNIT_TESTING)
  enable_testing()
  add_definitions(-DUNIT_TESTING)
  add_subdirectory(tests)
  list(APPEND CMAKE_CTEST_ARGUMENTS "--output-on-failure")

  if(CMAKE_C_COMPILER_ID STREQUAL "Clang")
    add_executable(ucode-san ${CLI_SOURCES} ${UCODE_SOURCES})
    set_property(TARGET ucode-san PROPERTY ENABLE_EXPORTS 1)
    target_link_libraries(ucode-san ${JSONC_LINK_LIBRARIES})
    target_compile_options(ucode-san PRIVATE -g -fno-omit-frame-pointer -fsanitize=undefined,address,leak -fno-sanitize-recover=all)
    target_link_options(ucode-san PRIVATE -fsanitize=undefined,address,leak)
  endif()
endif()

install(TARGETS ucode RUNTIME DESTINATION bin)
install(TARGETS libucode LIBRARY DESTINATION lib)
install(TARGETS ${LIBRARIES} LIBRARY DESTINATION lib/ucode)

add_custom_target(utpl ALL COMMAND ${CMAKE_COMMAND} -E create_symlink ucode utpl)
install(FILES ${CMAKE_CURRENT_BINARY_DIR}/utpl DESTINATION bin)

if(COMPILE_SUPPORT)
  add_custom_target(ucc ALL COMMAND ${CMAKE_COMMAND} -E create_symlink ucode ucc)
  install(FILES ${CMAKE_CURRENT_BINARY_DIR}/ucc DESTINATION bin)
endif()

file(GLOB UCODE_HEADERS "include/ucode/*.h")
install(FILES ${UCODE_HEADERS} DESTINATION include/ucode)

add_subdirectory(examples)