cmake_minimum_required(VERSION 3.16)

set(LIB_DIR  ${CMAKE_CURRENT_SOURCE_DIR}/../../../lib)
set(SRC_DIR  ${CMAKE_CURRENT_SOURCE_DIR}/../../../src)
set(TRANSPORT_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../transport)

# ============================================================================
# libuasync — low-level runtime library
# ============================================================================

set(UASYNC_SOURCES
    ${LIB_DIR}/ll_queue.c
    ${LIB_DIR}/u_async.c
    ${LIB_DIR}/debug_config.c
    ${LIB_DIR}/timeout_heap.c
    ${LIB_DIR}/memory_pool.c
    ${LIB_DIR}/sha256.c
    ${LIB_DIR}/socket_compat.c
    ${LIB_DIR}/platform_compat.c
    ${LIB_DIR}/getmyip.c
    ${LIB_DIR}/swm_min.c
    ${LIB_DIR}/mem.c
    ${LIB_DIR}/radix.c
    ${LIB_DIR}/serialize.c
    ${LIB_DIR}/tcp_io.c
    ${LIB_DIR}/liblmdb/mdb.c
    ${LIB_DIR}/liblmdb/midl.c
)

add_library(uasync STATIC ${UASYNC_SOURCES})

target_include_directories(uasync PUBLIC
    ${LIB_DIR}
    ${SRC_DIR}
    ${LIB_DIR}/liblmdb
)

target_compile_definitions(uasync PRIVATE
    _ISOC99_SOURCE
    DEBUG_OUTPUT_STDERR
)

set_target_properties(uasync PROPERTIES
    C_STANDARD 99
    C_STANDARD_REQUIRED ON
)

# ============================================================================
# libutun — VPN core library (all src/ except utun.c)
# ============================================================================

# Common sources (all platforms)
set(UTUN_COMMON_SOURCES
    ${SRC_DIR}/utun_instance.c
    ${SRC_DIR}/config_parser.c
    ${SRC_DIR}/config_updater.c
    ${SRC_DIR}/route_lib.c
    ${SRC_DIR}/route6_lib.c
    ${SRC_DIR}/route_bgp.c
    ${SRC_DIR}/route_ping.c
    ${SRC_DIR}/route_node.c
    ${SRC_DIR}/route_node_lmdb.c
    ${SRC_DIR}/route_connectivity.c
    ${SRC_DIR}/conn_mgr.c
    ${TRANSPORT_DIR}/db_sync_stub.c
    ${TRANSPORT_DIR}/chat_sync.c
    ${SRC_DIR}/routing.c
    ${SRC_DIR}/tun_if.c
    ${SRC_DIR}/tun_route.c
    ${SRC_DIR}/etcp.c
    ${SRC_DIR}/etcp_connections.c
    ${SRC_DIR}/etcp_bbr.c
    ${SRC_DIR}/etcp_loadbalancer.c
    ${SRC_DIR}/etcp_debug.c
    ${SRC_DIR}/etcp_dump.c
    ${SRC_DIR}/secure_channel.c
    ${SRC_DIR}/crc32.c
    ${SRC_DIR}/stcp_link.c
    ${SRC_DIR}/stcp.c
    ${SRC_DIR}/stcp_server.c
    ${SRC_DIR}/stcp_client.c
    ${SRC_DIR}/pkt_normalizer.c
    ${SRC_DIR}/packet_dump.c
    ${SRC_DIR}/etcp_api.c
    ${SRC_DIR}/etcp_connect.c
    ${SRC_DIR}/control_server.c
    ${SRC_DIR}/msg_transport.c
    ${SRC_DIR}/firewall.c
    ${SRC_DIR}/eim_nat.c
    ${SRC_DIR}/nat_transport.c
    ${SRC_DIR}/dummynet.c
    ${SRC_DIR}/etcp_router.c
    ${SRC_DIR}/proxy/tcp_proxy_client.c
    ${SRC_DIR}/proxy/tcp_proxy_server.c
    ${SRC_DIR}/proxy/udp_proxy.c
    ${SRC_DIR}/proxy/socks_proxy.c
    ${SRC_DIR}/proxy/icmp_proxy.c
    ${SRC_DIR}/lwip_tcp/lwip_pbuf.c
    ${SRC_DIR}/lwip_tcp/lwip_tcp.c
    ${SRC_DIR}/lwip_tcp/lwip_tcp_in.c
    ${SRC_DIR}/lwip_tcp/lwip_tcp_out.c
)

# Platform-specific TUN implementation
if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
    set(UTUN_TUN_SOURCES ${SRC_DIR}/tun_linux.c)
elseif(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
    set(UTUN_TUN_SOURCES ${SRC_DIR}/tun_freebsd.c)
elseif(CMAKE_SYSTEM_NAME STREQUAL "Windows")
    set(UTUN_TUN_SOURCES ${SRC_DIR}/tun_windows.c)
else()
    set(UTUN_TUN_SOURCES ${SRC_DIR}/tun_linux.c)
endif()

add_library(utun STATIC ${UTUN_COMMON_SOURCES} ${UTUN_TUN_SOURCES})

target_include_directories(utun PUBLIC
    ${SRC_DIR}
    ${LIB_DIR}
    ${TRANSPORT_DIR}
    ${SRC_DIR}/uip
)

target_compile_definitions(utun PRIVATE
    USE_OPENSSL
)

set_target_properties(utun PROPERTIES
    C_STANDARD 99
    C_STANDARD_REQUIRED ON
)

target_link_libraries(utun PUBLIC
    uasync
    OpenSSL::Crypto
    ${CMAKE_THREAD_LIBS_INIT}
)

# Platform-specific link flags
if(WIN32)
    target_link_libraries(utun PUBLIC ws2_32 iphlpapi advapi32 bcrypt dbghelp)
endif()