cmake_minimum_required(VERSION 3.20)
project(Rhiannon VERSION 1.0 LANGUAGES CXX)

set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

option(RHIANNON_WITH_MIDI_OSC "Enable PortMIDI + liblo bridge" OFF)
option(RHIANNON_WITH_WS "Enable WebSocket metrics (uWebSockets)" OFF)
option(RHIANNON_WITH_METAL "Enable Metal on Apple platforms" OFF)
option(RHIANNON_WITH_AVX2 "Enable AVX2 SIMD where supported" OFF)
option(RHIANNON_ENABLE_TESTS "Build unit tests" ON)

# Dependencies (header-only or optional)
find_package(spdlog QUIET)
find_package(nlohmann_json QUIET)

include(FetchContent)

if(NOT nlohmann_json_FOUND)
  FetchContent_Declare(
    nlohmann_json
    URL https://github.com/nlohmann/json/releases/download/v3.11.3/json.tar.xz
  )
  FetchContent_MakeAvailable(nlohmann_json)
endif()

if(RHIANNON_WITH_WS)
  # uWebSockets is optional and can be toggled on when environment is ready.
  FetchContent_Declare(
    uwebsockets
    GIT_REPOSITORY https://github.com/uNetworking/uWebSockets.git
    GIT_TAG v20.44.0
  )
  FetchContent_MakeAvailable(uwebsockets)
endif()

if(RHIANNON_WITH_MIDI_OSC)
  find_package(PkgConfig QUIET)
  if(PkgConfig_FOUND)
    pkg_check_modules(PORTMIDI QUIET portmidi)
    pkg_check_modules(LIBLO QUIET liblo)
  endif()
endif()

# Global compile definitions
if(RHIANNON_WITH_AVX2 AND CMAKE_SYSTEM_PROCESSOR MATCHES "(x86_64|AMD64)")
  add_compile_options(-mavx2)
  add_compile_definitions(RHIANNON_WITH_AVX2=1)
endif()

if(APPLE AND RHIANNON_WITH_METAL)
  find_library(METAL_FRAMEWORK Metal)
  find_library(FOUNDATION_FRAMEWORK Foundation)
  if(METAL_FRAMEWORK)
    add_compile_definitions(RHIANNON_WITH_METAL=1)
  endif()
endif()

add_subdirectory(src/agents)

# Demo app (follows repo convention: apps/)
add_executable(rhiannon_demo apps/rhiannon_demo/main.cpp)
target_compile_features(rhiannon_demo PRIVATE cxx_std_20)
target_link_libraries(rhiannon_demo PRIVATE rhiannon_lib)
target_include_directories(rhiannon_demo PRIVATE include)

if(spdlog_FOUND)
  target_link_libraries(rhiannon_demo PRIVATE spdlog::spdlog_header_only)
endif()

if(nlohmann_json_FOUND)
  target_link_libraries(rhiannon_demo PRIVATE nlohmann_json::nlohmann_json)
endif()

if(RHIANNON_WITH_WS)
  # uWebSockets is primarily header-only; ensure include path is present.
  if(TARGET uwebsockets)
    target_link_libraries(rhiannon_demo PRIVATE uwebsockets)
  endif()
  target_compile_definitions(rhiannon_demo PRIVATE RHIANNON_WITH_WS=1)
endif()

if(RHIANNON_WITH_MIDI_OSC)
  if(PORTMIDI_FOUND)
    target_include_directories(rhiannon_demo PRIVATE ${PORTMIDI_INCLUDE_DIRS})
    target_link_libraries(rhiannon_demo PRIVATE ${PORTMIDI_LIBRARIES})
    target_compile_definitions(rhiannon_demo PRIVATE RHIANNON_WITH_MIDI=1)
  endif()
  if(LIBLO_FOUND)
    target_include_directories(rhiannon_demo PRIVATE ${LIBLO_INCLUDE_DIRS})
    target_link_libraries(rhiannon_demo PRIVATE ${LIBLO_LIBRARIES})
    target_compile_definitions(rhiannon_demo PRIVATE RHIANNON_WITH_OSC=1)
  endif()
endif()

if(APPLE AND RHIANNON_WITH_METAL AND METAL_FRAMEWORK)
  target_link_libraries(rhiannon_demo PRIVATE ${METAL_FRAMEWORK} ${FOUNDATION_FRAMEWORK})
endif()

enable_testing()
if(RHIANNON_ENABLE_TESTS)
  FetchContent_Declare(
    googletest
    URL https://github.com/google/googletest/archive/refs/tags/v1.14.0.zip
  )
  set(BUILD_GMOCK OFF CACHE BOOL "" FORCE)
  set(INSTALL_GTEST OFF CACHE BOOL "" FORCE)
  FetchContent_MakeAvailable(googletest)

  # Standard location under tests/
  add_executable(rhiannon_tests tests/rhiannon_tests.cpp)
  target_compile_features(rhiannon_tests PRIVATE cxx_std_20)
  target_link_libraries(rhiannon_tests PRIVATE rhiannon_lib GTest::gtest_main)
  add_test(NAME rhiannon_tests COMMAND rhiannon_tests)
endif()