cmake_minimum_required(VERSION 3.20)

# --------------------------------------------------
# Project
# --------------------------------------------------
project(wolfram-engine-wrapper-client LANGUAGES CXX)
set(CMAKE_CXX_STANDARD 23)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

# Default to Release if not specified
if(NOT CMAKE_BUILD_TYPE)
    set(CMAKE_BUILD_TYPE Release)
endif()

# --------------------------------------------------
# External dependency: spdlog + LLU
# --------------------------------------------------
add_subdirectory(external/spdlog)
add_subdirectory(external/LibraryLinkUtilities)

# --------------------------------------------------
# External dependency: GLFW (cross-platform window/input)
# --------------------------------------------------
set(GLFW_BUILD_DOCS     OFF CACHE BOOL "" FORCE)
set(GLFW_BUILD_TESTS    OFF CACHE BOOL "" FORCE)
set(GLFW_BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)
set(GLFW_INSTALL        OFF CACHE BOOL "" FORCE)
add_subdirectory(external/glfw)

# --------------------------------------------------
# External dependency: OpenGL
# --------------------------------------------------
find_package(OpenGL REQUIRED)

# --------------------------------------------------
# External dependency: Dear ImGui (no CMakeLists.txt
# in upstream imgui — we build it manually here)
# --------------------------------------------------
set(IMGUI_DIR ${CMAKE_CURRENT_SOURCE_DIR}/external/imgui)

add_library(imgui STATIC
    ${IMGUI_DIR}/imgui.cpp
    ${IMGUI_DIR}/imgui_demo.cpp
    ${IMGUI_DIR}/imgui_draw.cpp
    ${IMGUI_DIR}/imgui_tables.cpp
    ${IMGUI_DIR}/imgui_widgets.cpp
    # Cross-platform backends: GLFW + OpenGL3
    ${IMGUI_DIR}/backends/imgui_impl_glfw.cpp
    ${IMGUI_DIR}/backends/imgui_impl_opengl3.cpp
)

target_include_directories(imgui PUBLIC
    ${IMGUI_DIR}
    ${IMGUI_DIR}/backends
)

target_link_libraries(imgui PUBLIC
    glfw
    OpenGL::GL
)

# On macOS, GLFW needs Cocoa/IOKit/CoreVideo frameworks
if(APPLE)
    target_link_libraries(imgui PUBLIC
        "-framework Cocoa"
        "-framework IOKit"
        "-framework CoreVideo"
    )
endif()

# On Linux, link against dl and X11 (GLFW pulls these in but be explicit)
if(UNIX AND NOT APPLE)
    target_link_libraries(imgui PUBLIC
        ${CMAKE_DL_LIBS}
    )
endif()

# --------------------------------------------------
# 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()

target_include_directories(${PROJECT_NAME} PRIVATE
    ${SRC_INCLUDES}
    ${CMAKE_CURRENT_SOURCE_DIR}/external/LibraryLinkUtilities/include
)

# --------------------------------------------------
# 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"
)
target_sources(${PROJECT_NAME} PRIVATE ${ALL_CPP})

# --------------------------------------------------
# Link dependencies
# --------------------------------------------------
target_link_libraries(${PROJECT_NAME} PRIVATE
    spdlog::spdlog
    LLU
    imgui
    OpenGL::GL
    glfw
)

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

# --------------------------------------------------
# Windows-specific: subsystem and runtime
# --------------------------------------------------
if(WIN32)
    # Use CONSOLE subsystem so stdout works; swap to WIN32 if you want
    # a pure GUI app with no terminal (requires WinMain entry point)
    set_target_properties(${PROJECT_NAME} PROPERTIES
        WIN32_EXECUTABLE FALSE
    )
endif()

# --------------------------------------------------
# macOS-specific: bundle info (optional, comment out
# if you don't want a .app bundle)
# --------------------------------------------------
if(APPLE)
    set_target_properties(${PROJECT_NAME} PROPERTIES
        MACOSX_BUNDLE FALSE  # set TRUE to produce a .app
    )
endif()