cmake_minimum_required(VERSION 3.20)

# -----------------------------
# Force Clang before project()
# -----------------------------
if(NOT DEFINED CMAKE_C_COMPILER)
    set(CMAKE_C_COMPILER clang CACHE STRING "" FORCE)
endif()

if(NOT DEFINED CMAKE_CXX_COMPILER)
    set(CMAKE_CXX_COMPILER clang++ CACHE STRING "" FORCE)
endif()

# -----------------------------
# Project setup
# -----------------------------
project(learning-hip LANGUAGES CXX)

set(CMAKE_CXX_STANDARD 23)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
set(CMAKE_BUILD_TYPE Release)

# -----------------------------
# System dependency: libsodium
# -----------------------------
find_package(PkgConfig REQUIRED)


# -----------------------------
# Dependencies (vendored)
# -----------------------------
add_subdirectory(external/spdlog)


# -----------------------------
# Executable
# -----------------------------
add_executable(${PROJECT_NAME} src/main.cpp)

# -----------------------------
# Auto-discover include dirs under src/
# -----------------------------
file(GLOB_RECURSE SRC_SUBDIRS LIST_DIRECTORIES true
    "${CMAKE_CURRENT_SOURCE_DIR}/src/*"
)

set(SRC_INCLUDES "")
foreach(dir ${SRC_SUBDIRS})
    if(IS_DIRECTORY ${dir})
        list(APPEND SRC_INCLUDES ${dir})
    endif()
endforeach()

# -----------------------------
# Auto-discover all .cpp except main.cpp
# -----------------------------
file(GLOB_RECURSE ALL_CPP
    "${CMAKE_CURRENT_SOURCE_DIR}/src/*.cpp"
)

list(REMOVE_ITEM ALL_CPP
    "${CMAKE_CURRENT_SOURCE_DIR}/src/main.cpp"
)

# -----------------------------
# Apply sources and includes
# -----------------------------
target_compile_definitions(learning-hip PRIVATE __HIP_PLATFORM_AMD__=1)
target_sources(${PROJECT_NAME} PRIVATE ${ALL_CPP})
target_include_directories(${PROJECT_NAME} PRIVATE
    ${SRC_INCLUDES}
    ${CMAKE_CURRENT_SOURCE_DIR}/external/hip  # vendored HIP headers
)

# -----------------------------
# Link libraries
# -----------------------------
target_link_libraries(${PROJECT_NAME} PRIVATE
    spdlog::spdlog
    amdhip64                                   # HIP runtime only
)

# -----------------------------
# Compiler warnings (Clang / GCC)
# -----------------------------
if(CMAKE_CXX_COMPILER_ID MATCHES "Clang|GNU")
    target_compile_options(${PROJECT_NAME} PRIVATE
        -Wall
        -Wextra
        -Wpedantic
        -Wconversion
        -Wshadow
        -Wnull-dereference
        -Wdouble-promotion
    )
endif()