cmake_minimum_required(VERSION 3.28)

project(ds3231 LANGUAGES CXX)

# libavr rides as the pinned submodule; LIBAVR_ROOT (cache or environment)
# overrides it for tandem development against a working tree. The toolchain
# file comes from the submodule via CMakePresets.json either way.
if(NOT LIBAVR_ROOT AND DEFINED ENV{LIBAVR_ROOT})
	set(LIBAVR_ROOT $ENV{LIBAVR_ROOT})
endif()
if(NOT LIBAVR_ROOT)
	set(LIBAVR_ROOT ${CMAKE_CURRENT_SOURCE_DIR}/libavr)
endif()
if(NOT EXISTS ${LIBAVR_ROOT}/CMakeLists.txt)
	message(FATAL_ERROR "libavr not found at ${LIBAVR_ROOT} - run: git submodule update --init libavr")
endif()
add_subdirectory(${LIBAVR_ROOT} libavr-build)

add_library(ds3231 INTERFACE)
target_include_directories(ds3231 INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/include)
target_link_libraries(ds3231 INTERFACE libavr)

include(${LIBAVR_ROOT}/cmake/checks.cmake)

if(PROJECT_IS_TOP_LEVEL)
	add_subdirectory(example)
	enable_testing()
	add_subdirectory(test)
endif()