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
# ============================================================================

file(GLOB UASYNC_SOURCES "${LIB_DIR}/*.c")
set(UASYNC_LMDB_SOURCES
    "${LIB_DIR}/liblmdb/mdb.c"
    "${LIB_DIR}/liblmdb/midl.c"
)
list(APPEND UASYNC_SOURCES ${UASYNC_LMDB_SOURCES})

add_library(uasync STATIC ${UASYNC_SOURCES})

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

add_library(opus_internal STATIC IMPORTED)
set_target_properties(opus_internal PROPERTIES IMPORTED_LOCATION "${LIB_DIR}/libopus/libopus_internal.a")

target_link_libraries(uasync PUBLIC opus_internal)

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) — all .c from src/ except main entry point and ref/ dirs
file(GLOB_RECURSE UTUN_COMMON_SOURCES "${SRC_DIR}/*.c")
list(FILTER UTUN_COMMON_SOURCES EXCLUDE REGEX "/lwip_orig/")
list(FILTER UTUN_COMMON_SOURCES EXCLUDE REGEX "/uip/")
list(FILTER UTUN_COMMON_SOURCES EXCLUDE REGEX "/transport_layer/BBR/")
list(REMOVE_ITEM UTUN_COMMON_SOURCES "${SRC_DIR}/utun.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}
    ${SRC_DIR}/transport_layer
    ${SRC_DIR}/routing_layer
    ${SRC_DIR}/media_delivery
    ${SRC_DIR}/media_async
    ${LIB_DIR}
    ${SRC_DIR}/uip
    ${CMAKE_SOURCE_DIR}/db
)

target_compile_definitions(utun PRIVATE
    USE_OPENSSL
    USE_SQLITE
)

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()