cmake_minimum_required(VERSION 3.10)
project(ked_flexible_build C)

set(CMAKE_C_STANDARD 11)



# User must provide:
# -DMAIN_FILE: the main .c file to compile


# User must provide:
# -DMAIN_FILE: the main .c file to compile
if(NOT DEFINED MAIN_FILE)
    message(FATAL_ERROR "MAIN_FILE must be specified.")
endif()

# Automatically infer PROJECT_ROOT as one level above this directory
get_filename_component(PROJECT_ROOT "${CMAKE_CURRENT_SOURCE_DIR}/.." ABSOLUTE)

message(STATUS "KED > CMAKE Dir: ${CMAKE_CURRENT_SOURCE_DIR}")
message(STATUS "KED > Project Root Dir: ${PROJECT_ROOT}")



# Interface headers to resolve against
set(KED_HEADERS
    ${CMAKE_CURRENT_SOURCE_DIR}/peripherals/gpio/gpio.h
)


set(KED_IMPL_SOURCES "")
foreach(header ${KED_HEADERS})
	message(STATUS "KED > Project Headers: ${KED_HEADERS}")
    file(RELATIVE_PATH rel_path ${CMAKE_CURRENT_SOURCE_DIR} ${header})
    string(REPLACE ".h" ".c" impl_rel_path ${rel_path})
    set(impl_path "${PROJECT_ROOT}/${impl_rel_path}")

    if(EXISTS ${impl_path})
		message(STATUS "KED > Project Sources: ${impl_path}")
        list(APPEND KED_IMPL_SOURCES ${impl_path})
    else()
		message(FATAL_ERROR "KED > Missing implementation for ${rel_path}: ${impl_path}")
    endif()
endforeach()

set(KED_MAIN ${PROJECT_ROOT}/${MAIN_FILE})
message(STATUS "KED > MAIN File: ${KED_MAIN}")

# Create the executable
add_executable(ked_executable
	${KED_MAIN}
    ${KED_IMPL_SOURCES}
)

# Use libgpiod if available
find_package(PkgConfig)
pkg_check_modules(GPIOD libgpiod)
if(GPIOD_FOUND)
	message(STATUS "KED > libgpiod found — defining KED_USES_LINUX")
    target_compile_definitions(ked_executable PRIVATE KED_USES_LINUX)
endif()

target_include_directories(ked_executable PRIVATE
    ${CMAKE_CURRENT_SOURCE_DIR}
    ${PROJECT_ROOT}
    ${GPIOD_INCLUDE_DIRS}
)

target_link_libraries(ked_executable
    ${GPIOD_LIBRARIES}
)