AC_INIT([utun],[2.0.0],[https://github.com/anomalyco/utun3/issues])
AC_CONFIG_SRCDIR([src/utun.c])
AC_CONFIG_HEADERS([config.h])
AC_CONFIG_AUX_DIR([build-aux])
AC_CONFIG_MACRO_DIR([m4])

# === ОБЯЗАТЕЛЬНО для правильного определения host ===
AC_CANONICAL_HOST
AC_CANONICAL_BUILD

# Required programs
AC_PROG_CC
AC_PROG_RANLIB
AM_PROG_AR
AM_INIT_AUTOMAKE([foreign subdir-objects -Wall])

AC_PROG_INSTALL
AC_PROG_MAKE_SET

# Option to use OpenSSL
AC_ARG_WITH([openssl],
    AS_HELP_STRING([--with-openssl], [Use OpenSSL for cryptography (default: yes)]),
    [with_openssl=$withval],
    [with_openssl=yes])

if test "x$with_openssl" = "xyes"; then
    # MSYS2 OpenSSL paths (для Windows)
    case "$host" in
        *mingw* | *msys* | *cygwin* | *win*)
            if test -d "/c/msys64/ucrt64/include/openssl"; then
                OPENSSL_CFLAGS="-I/c/msys64/ucrt64/include"
                OPENSSL_LIBS="-L/c/msys64/ucrt64/lib -lcrypto"
                AC_MSG_NOTICE([Using MSYS2 UCRT64 OpenSSL])
            elif test -d "/ucrt64/include/openssl"; then
                OPENSSL_CFLAGS="-I/ucrt64/include"
                OPENSSL_LIBS="-L/ucrt64/lib -lcrypto"
                AC_MSG_NOTICE([Using MSYS2 UCRT64 OpenSSL])
            elif test -d "/mingw64/include/openssl"; then
                OPENSSL_CFLAGS="-I/mingw64/include"
                OPENSSL_LIBS="-L/mingw64/lib -lcrypto"
                AC_MSG_NOTICE([Using MSYS2 MINGW64 OpenSSL])
            fi
            CFLAGS="$CFLAGS $OPENSSL_CFLAGS"
            LDFLAGS="$LDFLAGS $OPENSSL_LIBS"
            ;;
    esac

    save_LIBS="$LIBS"
    LIBS="-lcrypto $LIBS"
    AC_CHECK_LIB([crypto], [SHA256_Init],
        [AC_DEFINE([USE_OPENSSL], [1], [Define to use OpenSSL for cryptography])],
        [AC_MSG_ERROR([OpenSSL crypto library required. Use --without-openssl to use TinyCrypt.])])
    LIBS="$save_LIBS"
fi

AM_CONDITIONAL([USE_OPENSSL], [test "x$with_openssl" = "xyes"])

# ==================== НАДЁЖНЫЙ ДЕТЕКТ WINDOWS ====================
AC_MSG_CHECKING([for Windows])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#ifndef _WIN32
#error "Not Windows"
#endif
]], [[ return 0; ]])],
    [os_windows=yes],
    [os_windows=no])
AC_MSG_RESULT([$os_windows])

AM_CONDITIONAL([OS_WINDOWS], [test "x$os_windows" = "xyes"])

# ==================== DETECT FREEBSD ====================
AC_MSG_CHECKING([for FreeBSD])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#ifndef __FreeBSD__
#error "Not FreeBSD"
#endif
]], [[ return 0; ]])],
    [os_freebsd=yes],
    [os_freebsd=no])
AC_MSG_RESULT([$os_freebsd])

AM_CONDITIONAL([OS_FREEBSD], [test "x$os_freebsd" = "xyes"])

# Set TUN libs based on platform
if test "x$os_windows" = "xyes"; then
    TUN_LIBS="-liphlpapi -lws2_32 -ladvapi32 -lbcrypt -ldbghelp"
else
    TUN_LIBS=""
fi
AC_SUBST([TUN_LIBS])

# Checks for header files, typedefs, functions...
AC_CHECK_HEADERS([arpa/inet.h fcntl.h limits.h netinet/in.h stdlib.h string.h sys/ioctl.h sys/socket.h unistd.h])
AC_TYPE_SIZE_T
AC_TYPE_SSIZE_T
AC_TYPE_UINT16_T
AC_TYPE_UINT32_T
AC_TYPE_UINT64_T
AC_TYPE_UINT8_T
AC_C_INLINE

AC_FUNC_MALLOC
AC_CHECK_FUNCS([gettimeofday memset socket strchr strdup strerror strstr])

# TUN/TAP (только для Linux)
AC_MSG_CHECKING([for TUN/TAP support])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <linux/if_tun.h>]], [[int fd = open("/dev/net/tun", O_RDWR);]])],
    [AC_MSG_RESULT([yes]); AC_DEFINE([HAVE_TUN_TAP], [1], [Define if TUN/TAP is available])],
    [AC_MSG_RESULT([no])])

# Output
AC_CONFIG_FILES([Makefile src/Makefile tests/Makefile lib/Makefile])
AC_OUTPUT

# Summary
echo "
Configuration summary:
----------------------
  Host:         ${host}
  Windows:      ${os_windows}
  Prefix:       ${prefix}
  Compiler:     ${CC}
  CFLAGS:       ${CFLAGS}
"