# TODO
# - backend selection via command line, rather than simply detecting headers.

cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
project(cubeb C CXX)

option(LAZY_LOAD_LIBS "Lazily load shared libraries" ON)

if(NOT CMAKE_BUILD_TYPE)
  set(CMAKE_BUILD_TYPE "RelWithDebInfo" CACHE STRING
      "Choose the type of build, options are: Debug Release RelWithDebInfo MinSizeRel." FORCE)
endif()

set(CMAKE_C_STANDARD 99)
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

set(CMAKE_CXX_WARNING_LEVEL 4)
if(NOT MSVC)
  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -Wno-unused-parameter")
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -Wno-unused-parameter -fno-exceptions -fno-rtti")
else()
  string(REPLACE "/GR" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") # Disable RTTI
  string(REPLACE "/EHsc" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") # Disable Exceptions
endif()

add_library(cubeb
  src/cubeb.c
  src/cubeb_mixer.cpp
  src/cubeb_resampler.cpp
  src/cubeb_log.cpp
  src/cubeb_strings.c
  src/cubeb_utils.cpp
)
target_include_directories(cubeb
  PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include> $<INSTALL_INTERFACE:include>
)

add_library(speex OBJECT subprojects/speex/resample.c)
set_target_properties(speex PROPERTIES POSITION_INDEPENDENT_CODE TRUE)
target_include_directories(speex INTERFACE subprojects)
target_compile_definitions(speex PUBLIC
  OUTSIDE_SPEEX
  FLOATING_POINT
  EXPORT=
  RANDOM_PREFIX=speex
)

# $<BUILD_INTERFACE:> required because of https://gitlab.kitware.com/cmake/cmake/-/issues/15415
target_link_libraries(cubeb PRIVATE $<BUILD_INTERFACE:speex>)

include(CheckIncludeFiles)

# Threads needed by cubeb_log, _pulse, _alsa, _jack, _sndio, _oss and _sun
set(THREADS_PREFER_PTHREAD_FLAG ON)
find_package(Threads)
target_link_libraries(cubeb PRIVATE Threads::Threads)

if(LAZY_LOAD_LIBS)
  if(NOT APPLE AND NOT WIN32)
    # Skip checks on MacOS because it takes ages in XCode.
    check_include_files(pulse/pulseaudio.h USE_PULSE)
    check_include_files(alsa/asoundlib.h   USE_ALSA)
    check_include_files(jack/jack.h        USE_JACK)
    check_include_files(sndio.h            USE_SNDIO)

    if(USE_PULSE OR USE_ALSA OR USE_JACK OR USE_SNDIO)
      target_link_libraries(cubeb PRIVATE ${CMAKE_DL_LIBS})
    endif()
  endif()

elseif(NOT APPLE AND NOT WIN32)

  find_package(PkgConfig REQUIRED)

  pkg_check_modules(libpulse IMPORTED_TARGET libpulse)
  if(libpulse_FOUND)
    set(USE_PULSE ON)
    target_compile_definitions(cubeb PRIVATE DISABLE_LIBPULSE_DLOPEN)
    target_link_libraries(cubeb PRIVATE PkgConfig::libpulse)
  endif()

  pkg_check_modules(alsa IMPORTED_TARGET alsa)
  if(alsa_FOUND)
    set(USE_ALSA ON)
    target_compile_definitions(cubeb PRIVATE DISABLE_LIBASOUND_DLOPEN)
    target_link_libraries(cubeb PRIVATE PkgConfig::alsa)
  endif()

  pkg_check_modules(jack IMPORTED_TARGET jack)
  if(jack_FOUND)
    set(USE_JACK ON)
    target_compile_definitions(cubeb PRIVATE DISABLE_LIBJACK_DLOPEN)
    target_link_libraries(cubeb PRIVATE PkgConfig::jack)
  endif()

  check_include_files(sndio.h USE_SNDIO)
  if(USE_SNDIO)
    target_compile_definitions(cubeb PRIVATE DISABLE_LIBSNDIO_DLOPEN)
    target_link_libraries(cubeb PRIVATE sndio)
  endif()
endif()

if(USE_PULSE)
  target_sources(cubeb PRIVATE src/cubeb_pulse.c)
  target_compile_definitions(cubeb PRIVATE USE_PULSE)
endif()

if(USE_ALSA)
  target_sources(cubeb PRIVATE src/cubeb_alsa.c)
  target_compile_definitions(cubeb PRIVATE USE_ALSA)
endif()

if(USE_JACK)
  target_sources(cubeb PRIVATE src/cubeb_jack.cpp)
  target_compile_definitions(cubeb PRIVATE USE_JACK)
endif()

if(USE_SNDIO)
  target_sources(cubeb PRIVATE src/cubeb_sndio.c)
  target_compile_definitions(cubeb PRIVATE USE_SNDIO)
endif()

if(APPLE)
  check_include_files(AudioUnit/AudioUnit.h USE_AUDIOUNIT)
  if(USE_AUDIOUNIT)
    target_sources(cubeb PRIVATE
      src/cubeb_audiounit.cpp
      src/cubeb_osx_run_loop.cpp)
    target_compile_definitions(cubeb PRIVATE USE_AUDIOUNIT)
    target_link_libraries(cubeb PRIVATE "-framework AudioUnit" "-framework CoreAudio" "-framework CoreServices")
  endif()
endif()

if(WIN32)
  check_include_files(audioclient.h USE_WASAPI)
  if(USE_WASAPI)
    target_sources(cubeb PRIVATE
      src/cubeb_wasapi.cpp)
    target_compile_definitions(cubeb PRIVATE USE_WASAPI)
    target_link_libraries(cubeb PRIVATE avrt ole32 ksuser)
  endif()

  check_include_files("windows.h;mmsystem.h" USE_WINMM)
  if(USE_WINMM)
    target_sources(cubeb PRIVATE
      src/cubeb_winmm.c)
    target_compile_definitions(cubeb PRIVATE USE_WINMM)
    target_link_libraries(cubeb PRIVATE winmm)
  endif()
endif()

if(NOT WIN32 AND NOT APPLE)
  check_include_files(sys/soundcard.h HAVE_SYS_SOUNDCARD_H)
  if(HAVE_SYS_SOUNDCARD_H)
    try_compile(USE_OSS "${PROJECT_BINARY_DIR}/compile_tests"
      ${PROJECT_SOURCE_DIR}/cmake/compile_tests/oss_is_v4.c)
    if(USE_OSS)
      # strlcpy is not available on BSD systems that use glibc,
      # like Debian kfreebsd, so try using libbsd if available
      include(CheckSymbolExists)
      check_symbol_exists(strlcpy string.h HAVE_STRLCPY)
      if(NOT HAVE_STRLCPY)
        pkg_check_modules(libbsd-overlay IMPORTED_TARGET libbsd-overlay)
        if(libbsd-overlay_FOUND)
          target_link_libraries(cubeb PRIVATE PkgConfig::libbsd-overlay)
          set(HAVE_STRLCPY true)
        endif()
      endif()
      if (HAVE_STRLCPY)
        target_sources(cubeb PRIVATE
          src/cubeb_oss.c)
        target_compile_definitions(cubeb PRIVATE USE_OSS)
      endif()
    endif()
  endif()
endif()