cmake_minimum_required(VERSION 3.16)
project(UDPScope CXX C)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_C_STANDARD 99)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

option(UDPSCOPE_BUILD_TESTS "Build the unit tests" ON)

set(STREAMHUB_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../streamhub)
set(CCLIENT_DIR   ${CMAKE_CURRENT_SOURCE_DIR}/../../Common/Client/c)

# ── The standalone C UDPS client, compiled in directly ────────────────────────
# Building it here rather than shelling out to its own Makefile keeps this a
# single cmake --build away from a working binary.
add_library(udpsclient STATIC ${CCLIENT_DIR}/udps_client.c)
target_include_directories(udpsclient PUBLIC ${CCLIENT_DIR})
target_compile_options(udpsclient PRIVATE -Wall -Wextra -Wpedantic)

# ── System packages ───────────────────────────────────────────────────────────
find_package(OpenGL REQUIRED)

find_package(SDL2 QUIET CONFIG)
if(NOT SDL2_FOUND)
    find_package(PkgConfig REQUIRED)
    pkg_check_modules(SDL2 REQUIRED sdl2)
    add_library(SDL2::SDL2 INTERFACE IMPORTED)
    target_include_directories(SDL2::SDL2 INTERFACE ${SDL2_INCLUDE_DIRS})
    target_link_libraries(SDL2::SDL2 INTERFACE ${SDL2_LIBRARIES})
    target_compile_options(SDL2::SDL2 INTERFACE ${SDL2_CFLAGS_OTHER})
endif()

# ── Dear ImGui + ImPlot ───────────────────────────────────────────────────────
include(FetchContent)

FetchContent_Declare(imgui
    GIT_REPOSITORY https://github.com/ocornut/imgui.git
    GIT_TAG        v1.91.8
    GIT_SHALLOW    TRUE)
FetchContent_MakeAvailable(imgui)

FetchContent_Declare(implot
    GIT_REPOSITORY https://github.com/epezent/implot.git
    GIT_TAG        v0.17
    GIT_SHALLOW    TRUE)
FetchContent_MakeAvailable(implot)

add_library(imgui_lib STATIC
    ${imgui_SOURCE_DIR}/imgui.cpp
    ${imgui_SOURCE_DIR}/imgui_draw.cpp
    ${imgui_SOURCE_DIR}/imgui_tables.cpp
    ${imgui_SOURCE_DIR}/imgui_widgets.cpp
    ${imgui_SOURCE_DIR}/backends/imgui_impl_sdl2.cpp
    ${imgui_SOURCE_DIR}/backends/imgui_impl_opengl3.cpp
    ${implot_SOURCE_DIR}/implot.cpp
    ${implot_SOURCE_DIR}/implot_items.cpp)
target_include_directories(imgui_lib PUBLIC
    ${imgui_SOURCE_DIR} ${imgui_SOURCE_DIR}/backends ${implot_SOURCE_DIR})
target_link_libraries(imgui_lib PUBLIC SDL2::SDL2 OpenGL::GL)
target_compile_options(imgui_lib PRIVATE -w)

# ── Bundled resources, borrowed read-only from the StreamHub client ───────────
set(RESOURCE_DIR ${STREAMHUB_DIR}/resources)
set(FONT_DIR     ${RESOURCE_DIR}/fonts)

if(EXISTS ${FONT_DIR}/fa-solid-900.ttf AND EXISTS ${FONT_DIR}/IconsFontAwesome6.h)
    set(HAVE_FONT_AWESOME TRUE)
    message(STATUS "Font Awesome icons enabled (${FONT_DIR})")
else()
    set(HAVE_FONT_AWESOME FALSE)
    message(WARNING "Bundled Font Awesome missing — using ASCII icon fallbacks")
endif()

file(COPY ${FONT_DIR} DESTINATION ${CMAKE_BINARY_DIR}/resources)

# ── Core library: everything except main.cpp, so tests can link it ────────────
set(CORE_SOURCES
    Decimate.cpp
)

add_library(udpscope_core STATIC ${CORE_SOURCES})
target_include_directories(udpscope_core PUBLIC
    ${CMAKE_CURRENT_SOURCE_DIR}
    ${STREAMHUB_DIR})          # SignalBuffer.h, reused verbatim
target_link_libraries(udpscope_core PUBLIC udpsclient pthread)
target_compile_options(udpscope_core PRIVATE -Wall -Wextra -Wno-unused-parameter)

# ── Application ───────────────────────────────────────────────────────────────
set(APP_SOURCES
    main.cpp
)

if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/main.cpp)
    add_executable(UDPScope ${APP_SOURCES})
    target_link_libraries(UDPScope PRIVATE udpscope_core imgui_lib SDL2::SDL2 OpenGL::GL)
    target_compile_definitions(UDPScope PRIVATE APP_RESOURCE_DIR="${RESOURCE_DIR}")
    if(HAVE_FONT_AWESOME)
        target_include_directories(UDPScope PRIVATE ${FONT_DIR})
        target_compile_definitions(UDPScope PRIVATE HAVE_FONT_AWESOME)
    endif()
    target_compile_options(UDPScope PRIVATE -Wall -Wextra -Wno-unused-parameter)

    install(TARGETS UDPScope DESTINATION bin)
    install(DIRECTORY ${FONT_DIR} DESTINATION share/udpscope)
endif()

# ── Tests ─────────────────────────────────────────────────────────────────────
if(UDPSCOPE_BUILD_TESTS)
    FetchContent_Declare(googletest
        GIT_REPOSITORY https://github.com/google/googletest.git
        GIT_TAG        v1.15.2
        GIT_SHALLOW    TRUE)
    set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
    FetchContent_MakeAvailable(googletest)

    file(GLOB TEST_SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/tests/*.cpp)
    add_executable(udpscope_tests ${TEST_SOURCES})
    target_link_libraries(udpscope_tests PRIVATE udpscope_core GTest::gtest_main)
    target_compile_options(udpscope_tests PRIVATE -Wall -Wextra -Wno-unused-parameter)

    enable_testing()
    include(GoogleTest)
    gtest_discover_tests(udpscope_tests)
endif()