# ============================================================================
# sources_config.cmake
# ----------------------------------------------------------------------------
# Collects the list of source files and include directories for the build.
# Does NOT declare the executable - the top-level CMakeLists.txt handles
# add_executable() so the build target is visible in one obvious place.
#
# Exported variables:
#   PROJECT_SOURCES      - list of every .c file under src/
#   PROJECT_INCLUDE_DIRS - list of include paths for each component
# ============================================================================

# NOTE: all source/header paths below are rooted at PROJECT_ROOT_DIR, which
# the top-level CMakeLists.txt computes as the parent of its own directory
# (i.e. one level above cmake/). We do NOT use CMAKE_SOURCE_DIR here because
# that variable points at the cmake/ folder itself, not at the project root.

# Recursively collect every .c file under src/. CONFIGURE_DEPENDS makes
# CMake re-check the glob on every build, so newly added .c files are
# picked up without having to manually re-run cmake. The trade-off is a
# tiny build-time stat check on each file, which is well worth it for a
# small project where we add files often.
file(GLOB_RECURSE PROJECT_SOURCES CONFIGURE_DEPENDS
     "${PROJECT_ROOT_DIR}/src/*.c")

# Every component follows the same folder convention:
#   inc/  - public API headers (safe for any other component to include)
#   prg/  - private headers and implementation files (component-internal)
#   cfg/  - configuration headers and constants
#
# All three are added to the include path here so #include "MCU_UART.h"
# etc. resolves regardless of which translation unit is doing the include.
set(PROJECT_INCLUDE_DIRS
    # Shared library layer - fundamental types used by every component
    ${PROJECT_ROOT_DIR}/src/STD_TYPES/inc

    # MCU layer - hardware abstraction for the RP2040 UART peripheral
    ${PROJECT_ROOT_DIR}/src/MCU_UART/inc
    ${PROJECT_ROOT_DIR}/src/MCU_UART/prg
    ${PROJECT_ROOT_DIR}/src/MCU_UART/cfg

    # MCU layer - hardware abstraction for the RP2040 USB-CDC peripheral
    # (the Pico appears as a virtual serial port on the host computer)
    ${PROJECT_ROOT_DIR}/src/MCU_USB/inc
    ${PROJECT_ROOT_DIR}/src/MCU_USB/prg
    ${PROJECT_ROOT_DIR}/src/MCU_USB/cfg

    # HAL layer - transport-agnostic communication abstraction that
    # dispatches to MCU_UART, MCU_USB, or both depending on configuration
    ${PROJECT_ROOT_DIR}/src/HAL_COM/inc
    ${PROJECT_ROOT_DIR}/src/HAL_COM/prg
    ${PROJECT_ROOT_DIR}/src/HAL_COM/cfg

    # Application layer - color switcher application logic
    ${PROJECT_ROOT_DIR}/src/APP_CLSW/inc
    ${PROJECT_ROOT_DIR}/src/APP_CLSW/prg
    ${PROJECT_ROOT_DIR}/src/APP_CLSW/cfg

    # Application layer - system ECU / top-level orchestrator
    ${PROJECT_ROOT_DIR}/src/SYS_ECU/prg
)