# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.

from __future__ import absolute_import, division, print_function

import os
import sys

from _cffi_src.utils import (
    build_ffi_for_binding, compiler_type, extra_link_args
)


def _get_openssl_libraries(platform):
    # OpenSSL goes by a different library name on different operating systems.
    if platform == "darwin":
        return _osx_libraries(
            os.environ.get("CRYPTOGRAPHY_OSX_NO_LINK_FLAGS")
        )
    elif platform == "win32":
        if compiler_type() == "msvc":
            libs = ["libeay32", "ssleay32"]
        else:
            libs = ["ssl", "crypto"]
        return libs + ["advapi32", "crypt32", "gdi32", "user32", "ws2_32"]
    else:
        # In some circumstances, the order in which these libs are
        # specified on the linker command-line is significant;
        # libssl must come before libcrypto
        # (http://marc.info/?l=openssl-users&m=135361825921871)
        return ["ssl", "crypto"]


def _osx_libraries(build_static):
    # For building statically we don't want to pass the -lssl or -lcrypto flags
    if build_static == "1":
        return []
    else:
        return ["ssl", "crypto"]


ffi = build_ffi_for_binding(
    module_name="_openssl",
    module_prefix="_cffi_src.openssl.",
    modules=[
        # This goes first so we can define some cryptography-wide symbols.
        "cryptography",

        "aes",
        "asn1",
        "bignum",
        "bio",
        "cmac",
        "cms",
        "conf",
        "crypto",
        "dh",
        "dsa",
        "ec",
        "ecdh",
        "ecdsa",
        "engine",
        "err",
        "evp",
        "hmac",
        "nid",
        "objects",
        "ocsp",
        "opensslv",
        "pem",
        "pkcs12",
        "rand",
        "rsa",
        "ssl",
        "x509",
        "x509name",
        "x509v3",
        "x509_vfy",
        "pkcs7",
        "callbacks",
    ],
    libraries=_get_openssl_libraries(sys.platform),
    extra_link_args=extra_link_args(compiler_type()),
)