# app/vpn/CMakeLists_vpn.cmake
#
# Include this file from the top-level moonlight-qt CMakeLists.txt:
#
#   include(app/vpn/CMakeLists_vpn.cmake)
#
# Prerequisites (per platform):
#   macOS  : bash scripts/build-boringtun.sh --universal
#   Windows: pwsh scripts/build-boringtun-win.ps1
#   Linux  : bash scripts/build-boringtun.sh
#
# The build scripts drop the static library at:
#   macOS/Linux  : deps/boringtun/libboringtun.a
#   Windows      : deps/boringtun/boringtun.lib

# ─── boringtun static library ─────────────────────────────────────────────────

if(WIN32)
    set(BORINGTUN_LIB "${CMAKE_SOURCE_DIR}/deps/boringtun/boringtun.lib")
else()
    set(BORINGTUN_LIB "${CMAKE_SOURCE_DIR}/deps/boringtun/libboringtun.a")
endif()

if(NOT EXISTS "${BORINGTUN_LIB}")
    if(WIN32)
        message(FATAL_ERROR
            "boringtun static library not found at ${BORINGTUN_LIB}\n"
            "Run:  pwsh scripts/build-boringtun-win.ps1\n"
            "then re-run CMake.")
    else()
        message(FATAL_ERROR
            "boringtun static library not found at ${BORINGTUN_LIB}\n"
            "Run:  bash scripts/build-boringtun.sh --universal\n"
            "then re-run CMake.")
    endif()
endif()

add_library(boringtun STATIC IMPORTED)
set_target_properties(boringtun PROPERTIES
    IMPORTED_LOCATION "${BORINGTUN_LIB}"
)

# ─── VPN source files ──────────────────────────────────────────────────────────

set(VPN_SOURCES
    app/vpn/wireguardconfig.cpp
    app/vpn/relayclient.cpp
    app/vpn/dragonrelaybackend.cpp   # QObject bridge: RelayClient + TunnelManager → QML
)

if(APPLE)
    list(APPEND VPN_SOURCES app/vpn/tunnelmanager_mac.mm)
elseif(WIN32)
    list(APPEND VPN_SOURCES app/vpn/tunnelmanager_win.cpp)
elseif(UNIX)
    list(APPEND VPN_SOURCES app/vpn/tunnelmanager_linux.cpp) # future
endif()

# ─── Integration into moonlight-qt target ─────────────────────────────────────
# Replace moonlight-qt below with whatever your top-level CMakeLists calls the app target.

target_sources(moonlight-qt PRIVATE ${VPN_SOURCES})

target_include_directories(moonlight-qt PRIVATE
    "${CMAKE_SOURCE_DIR}/app/vpn"
)

target_link_libraries(moonlight-qt PRIVATE boringtun)

if(APPLE)
    # Frameworks required by boringtun + tunnel implementation on macOS
    target_link_libraries(moonlight-qt PRIVATE
        "-framework Security"
        "-framework Network"
        "-framework SystemConfiguration"
    )
    # Objective-C++ ARC needed for tunnelmanager_mac.mm
    set_source_files_properties(
        app/vpn/tunnelmanager_mac.mm
        PROPERTIES COMPILE_FLAGS "-fobjc-arc"
    )

elseif(WIN32)
    # Windows system libraries required by Wintun + IP Helper API + Winsock
    #   iphlpapi   — CreateUnicastIpAddressEntry, CreateIpForwardEntry2
    #   ws2_32     — socket, sendto, recvfrom, WSAEventSelect, …
    #   ntdll      — required by boringtun's ring0 primitives
    #   ole32      — CoCreateGuid (adapter GUID)
    target_link_libraries(moonlight-qt PRIVATE
        iphlpapi
        ws2_32
        ntdll
        ole32
    )

    # Embed the UAC manifest so Windows prompts for elevation at launch.
    # Visual Studio picks this up automatically; for Ninja/MSBuild add
    # a custom command that runs mt.exe post-link.
    if(MSVC)
        set_target_properties(moonlight-qt PROPERTIES
            LINK_FLAGS "/MANIFEST:EMBED /MANIFESTINPUT:${CMAKE_SOURCE_DIR}/app/DragonMoonlight.manifest"
        )
    else()
        # MinGW: link the manifest as a resource
        configure_file(
            "${CMAKE_SOURCE_DIR}/app/DragonMoonlight.manifest"
            "${CMAKE_CURRENT_BINARY_DIR}/DragonMoonlight.manifest"
            COPYONLY
        )
        target_sources(moonlight-qt PRIVATE
            "${CMAKE_CURRENT_BINARY_DIR}/DragonMoonlight.manifest"
        )
    endif()
endif()