add_library(faset_runtime STATIC
    ${CMAKE_CURRENT_LIST_DIR}/../src/runtime/Runtime.cpp
    ${CMAKE_CURRENT_LIST_DIR}/../src/runtime/Physics.cpp)
add_library(Faset::Runtime ALIAS faset_runtime)
target_compile_features(faset_runtime PUBLIC cxx_std_20)
target_include_directories(faset_runtime PUBLIC ${CMAKE_CURRENT_LIST_DIR}/../include)
target_link_libraries(faset_runtime PUBLIC nlohmann_json::nlohmann_json PRIVATE EnTT::EnTT box2d box3d)

set(FASET_GAMEPLAY_SOURCE_DIR "${PROJECT_SOURCE_DIR}/examples/gameplay" CACHE PATH "Directory containing the game's Gameplay.cpp and Gameplay.hpp")
if(NOT EXISTS "${FASET_GAMEPLAY_SOURCE_DIR}/Gameplay.cpp" AND NOT EXISTS "${FASET_GAMEPLAY_SOURCE_DIR}/Gameplay.hpp" AND FASET_ENABLE_LUA)
    # A Lua-only game needs the same stable native entry points, but no user C++.
    set(FASET_GAMEPLAY_SOURCE_DIR "${PROJECT_SOURCE_DIR}/src/scripting/empty_gameplay")
elseif(NOT EXISTS "${FASET_GAMEPLAY_SOURCE_DIR}/Gameplay.cpp" OR NOT EXISTS "${FASET_GAMEPLAY_SOURCE_DIR}/Gameplay.hpp")
    message(FATAL_ERROR "Provide both Gameplay.cpp and Gameplay.hpp, or enable Lua for a Lua-only project")
endif()
add_library(faset_gameplay STATIC "${FASET_GAMEPLAY_SOURCE_DIR}/Gameplay.cpp")
add_library(Faset::Gameplay ALIAS faset_gameplay)
target_include_directories(faset_gameplay PUBLIC "${FASET_GAMEPLAY_SOURCE_DIR}")
target_link_libraries(faset_gameplay PUBLIC faset_runtime)

if(BUILD_TESTING)
    add_executable(faset_runtime_tests ${CMAKE_CURRENT_LIST_DIR}/../tests/runtime_tests.cpp)
    if(FASET_GAMEPLAY_SOURCE_DIR STREQUAL "${PROJECT_SOURCE_DIR}/examples/gameplay")
        target_link_libraries(faset_runtime_tests PRIVATE faset_runtime faset_gameplay)
    else()
        add_library(faset_gameplay_test_fixture STATIC ${CMAKE_CURRENT_LIST_DIR}/../examples/gameplay/Gameplay.cpp)
        target_include_directories(faset_gameplay_test_fixture PUBLIC ${CMAKE_CURRENT_LIST_DIR}/../examples/gameplay)
        target_link_libraries(faset_gameplay_test_fixture PUBLIC faset_runtime)
        target_link_libraries(faset_runtime_tests PRIVATE faset_runtime faset_gameplay_test_fixture)
    endif()
    add_test(NAME runtime_contracts COMMAND faset_runtime_tests)
endif()