CMakeLists.txt

# =============================================================================
# Axon by ArcheBase - Root CMake Configuration
# =============================================================================
# This file provides centralized configuration for all Axon modules.
# Individual modules can be built standalone (for faster iteration) or
# together from the repository root.
#
# Build from root:
#   cmake -B build -S . -DAXON_BUILD_TESTS=ON
#   cmake --build build
#
# Build individual modules (still works):
#   cmake -B build -S core/axon_mcap
# =============================================================================

cmake_minimum_required(VERSION 3.14)
project(Axon VERSION 0.4.0 LANGUAGES CXX)

# =============================================================================
# Centralized Path Definitions
# =============================================================================
# All modules use these variables instead of computing relative paths.
# This ensures consistency across the codebase.

get_filename_component(AXON_REPO_ROOT "${CMAKE_CURRENT_SOURCE_DIR}" ABSOLUTE)
set(AXON_CORE_DIR "${AXON_REPO_ROOT}/core")
set(AXON_LOGGING_DIR "${AXON_CORE_DIR}/axon_logging")
set(AXON_MCAP_DIR "${AXON_CORE_DIR}/axon_mcap")
set(AXON_UPLOADER_DIR "${AXON_CORE_DIR}/axon_uploader")
set(AXON_MEMORY_DIR "${AXON_CORE_DIR}/axon_memory")
set(AXON_MIDDLEWARES_DIR "${AXON_REPO_ROOT}/middlewares")
set(AXON_APPS_DIR "${AXON_REPO_ROOT}/apps")
set(AXON_CMAKE_MODULES_DIR "${AXON_REPO_ROOT}/cmake/Modules")

# Make variables available to child CMakeLists
set(AXON_REPO_ROOT "${AXON_REPO_ROOT}" CACHE INTERNAL "")
set(AXON_CORE_DIR "${AXON_CORE_DIR}" CACHE INTERNAL "")
set(AXON_LOGGING_DIR "${AXON_LOGGING_DIR}" CACHE INTERNAL "")
set(AXON_MCAP_DIR "${AXON_MCAP_DIR}" CACHE INTERNAL "")
set(AXON_UPLOADER_DIR "${AXON_UPLOADER_DIR}" CACHE INTERNAL "")
set(AXON_MEMORY_DIR "${AXON_MEMORY_DIR}" CACHE INTERNAL "")
set(AXON_MIDDLEWARES_DIR "${AXON_MIDDLEWARES_DIR}" CACHE INTERNAL "")
set(AXON_APPS_DIR "${AXON_APPS_DIR}" CACHE INTERNAL "")
set(AXON_CMAKE_MODULES_DIR "${AXON_CMAKE_MODULES_DIR}" CACHE INTERNAL "")

# =============================================================================
# Common CMake Policies
# =============================================================================
# These policies apply to all Axon modules.

# Suppress CMP0167 warning (FindBoost module removed in CMake 3.30+)
# Use modern BoostConfig.cmake instead of FindBoost.cmake
if(POLICY CMP0167)
    cmake_policy(SET CMP0167 NEW)
endif()

# =============================================================================
# Shared Options
# =============================================================================
# These options can be set from the command line and propagate to all modules.

option(AXON_ENABLE_COVERAGE "Enable code coverage for all Axon modules" OFF)
option(AXON_BUILD_TESTS "Build tests for all Axon modules" OFF)
option(AXON_BUILD_UPLOADER "Build axon_uploader (requires AWS SDK)" OFF)

# Enable testing globally
if(AXON_BUILD_TESTS)
    enable_testing()
endif()

# =============================================================================
# Include CMake Modules
# =============================================================================
list(APPEND CMAKE_MODULE_PATH "${AXON_CMAKE_MODULES_DIR}")

# Include standard library utilities FIRST (required by all modules)
include(AxonStdLib REQUIRED)
include(AxonCoverage OPTIONAL)

# =============================================================================
# Shared Dependencies
# =============================================================================
# These dependencies are fetched once and reused by all modules.

# Set CMP0135 policy to NEW behavior for CMake 3.25+
if(CMAKE_VERSION VERSION_GREATER_EQUAL "3.25")
    cmake_policy(SET CMP0135 NEW)
endif()

# Set CMP0136 policy to OLD to avoid tar --touch flag incompatibility
# CMake 3.24+ uses --touch flag which older tar versions don't support
if(CMAKE_VERSION VERSION_GREATER_EQUAL "3.24")
    cmake_policy(SET CMP0136 OLD)
endif()

include(FetchContent)

# Find Threads (required by Boost::thread)
find_package(Threads REQUIRED)

# nlohmann/json - shared across all modules
FetchContent_Declare(
    nlohmann_json
    URL https://github.com/nlohmann/json/releases/download/v3.11.3/json.tar.xz
    URL_HASH
        SHA256=d6c65aca6b1ed68e7a182f4757257b107ae403032760ed6ef121c9d55e81757d
)
FetchContent_MakeAvailable(nlohmann_json)

# =============================================================================
# Module Subdirectories
# =============================================================================
# Add C++ libraries in dependency order.

# =============================================================================
# Memory (no dependencies)
# =============================================================================
if(EXISTS "${AXON_MEMORY_DIR}/CMakeLists.txt")
    add_subdirectory(${AXON_MEMORY_DIR} ${CMAKE_CURRENT_BINARY_DIR}/axon_memory)
endif()

# =============================================================================
# Logging (no dependencies)
# =============================================================================
if(EXISTS "${AXON_LOGGING_DIR}/CMakeLists.txt")
    add_subdirectory(
        ${AXON_LOGGING_DIR}
        ${CMAKE_CURRENT_BINARY_DIR}/axon_logging
    )
endif()

# =============================================================================
# MCAP (depends on logging)
# =============================================================================
if(EXISTS "${AXON_MCAP_DIR}/CMakeLists.txt")
    add_subdirectory(${AXON_MCAP_DIR} ${CMAKE_CURRENT_BINARY_DIR}/axon_mcap)
endif()

# =============================================================================
# Uploader (depends on MCAP, logging, AWS SDK)
# =============================================================================
if(AXON_BUILD_UPLOADER AND EXISTS "${AXON_UPLOADER_DIR}/CMakeLists.txt")
    add_subdirectory(
        ${AXON_UPLOADER_DIR}
        ${CMAKE_CURRENT_BINARY_DIR}/axon_uploader
    )
endif()

# =============================================================================
# Middlewares (ROS1, ROS2, Zenoh, Mock)
# =============================================================================
if(EXISTS "${AXON_MIDDLEWARES_DIR}/CMakeLists.txt")
    add_subdirectory(
        ${AXON_MIDDLEWARES_DIR}
        ${CMAKE_CURRENT_BINARY_DIR}/middlewares
    )
endif()

# =============================================================================
# Applications
# =============================================================================
if(EXISTS "${AXON_APPS_DIR}/axon_recorder/CMakeLists.txt")
    add_subdirectory(
        ${AXON_APPS_DIR}/axon_recorder
        ${CMAKE_CURRENT_BINARY_DIR}/axon_recorder
    )
endif()

if(EXISTS "${AXON_APPS_DIR}/axon_config/CMakeLists.txt")
    add_subdirectory(
        ${AXON_APPS_DIR}/axon_config
        ${CMAKE_CURRENT_BINARY_DIR}/axon_config
    )
endif()

if(EXISTS "${AXON_APPS_DIR}/axon_transfer/CMakeLists.txt")
    add_subdirectory(
        ${AXON_APPS_DIR}/axon_transfer
        ${CMAKE_CURRENT_BINARY_DIR}/axon_transfer
    )
endif()

if(EXISTS "${AXON_APPS_DIR}/axon_agent/CMakeLists.txt")
    add_subdirectory(
        ${AXON_APPS_DIR}/axon_agent
        ${CMAKE_CURRENT_BINARY_DIR}/axon_agent
    )
endif()

if(EXISTS "${AXON_APPS_DIR}/axon_system/CMakeLists.txt")
    add_subdirectory(
        ${AXON_APPS_DIR}/axon_system
        ${CMAKE_CURRENT_BINARY_DIR}/axon_system
    )
endif()

if(EXISTS "${AXON_APPS_DIR}/axon_panel/CMakeLists.txt")
    add_subdirectory(
        ${AXON_APPS_DIR}/axon_panel
        ${CMAKE_CURRENT_BINARY_DIR}/axon_panel
    )
endif()

if(EXISTS "${AXON_APPS_DIR}/axon_dispatcher/CMakeLists.txt")
    add_subdirectory(
        ${AXON_APPS_DIR}/axon_dispatcher
        ${CMAKE_CURRENT_BINARY_DIR}/axon_dispatcher
    )
endif()

if(EXISTS "${AXON_APPS_DIR}/plugin_example/CMakeLists.txt")
    add_subdirectory(
        ${AXON_APPS_DIR}/plugin_example
        ${CMAKE_CURRENT_BINARY_DIR}/plugin_example
    )
endif()

# =============================================================================
# Summary
# =============================================================================
message(STATUS "")
message(STATUS "=== Axon Configuration ===")
message(STATUS "  Repository Root: ${AXON_REPO_ROOT}")
message(STATUS "  Core Libraries:   ${AXON_CORE_DIR}")
message(STATUS "  Middlewares:      ${AXON_MIDDLEWARES_DIR}")
message(STATUS "  Applications:     ${AXON_APPS_DIR}")
message(STATUS "  Coverage:         ${AXON_ENABLE_COVERAGE}")
message(STATUS "  Tests:            ${AXON_BUILD_TESTS}")
message(STATUS "  Uploader:         ${AXON_BUILD_UPLOADER}")
message(STATUS "=====================================")
message(STATUS "")