/*
 *
 * Copyright 2017 gRPC authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

#include <stdbool.h>
#include <stdio.h>
#include <string.h>

#include "src/core/lib/security/security_connector/security_connector.h"
#include "src/core/tsi/fake_transport_security.h"
#include "src/core/tsi/transport_security.h"
#include "test/core/tsi/transport_security_test_lib.h"
#include "test/core/util/test_config.h"

#include <grpc/grpc.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>

typedef struct fake_tsi_test_fixture {
  tsi_test_fixture base;
} fake_tsi_test_fixture;

static void fake_test_setup_handshakers(tsi_test_fixture* fixture) {
  fixture->client_handshaker =
      tsi_create_fake_handshaker(true /* is_client. */);
  fixture->server_handshaker =
      tsi_create_fake_handshaker(false /* is_client. */);
}

static void validate_handshaker_peers(tsi_handshaker_result* result) {
  GPR_ASSERT(result != nullptr);
  tsi_peer peer;
  GPR_ASSERT(tsi_handshaker_result_extract_peer(result, &peer) == TSI_OK);
  const tsi_peer_property* property =
      tsi_peer_get_property_by_name(&peer, TSI_CERTIFICATE_TYPE_PEER_PROPERTY);
  GPR_ASSERT(property != nullptr);
  GPR_ASSERT(memcmp(property->value.data, TSI_FAKE_CERTIFICATE_TYPE,
                    property->value.length) == 0);
  tsi_peer_destruct(&peer);
}

static void fake_test_check_handshaker_peers(tsi_test_fixture* fixture) {
  validate_handshaker_peers(fixture->client_result);
  validate_handshaker_peers(fixture->server_result);
}

static void fake_test_destruct(tsi_test_fixture* /*fixture*/) {}

static const struct tsi_test_fixture_vtable vtable = {
    fake_test_setup_handshakers, fake_test_check_handshaker_peers,
    fake_test_destruct};

static tsi_test_fixture* fake_tsi_test_fixture_create() {
  fake_tsi_test_fixture* fake_fixture =
      static_cast<fake_tsi_test_fixture*>(gpr_zalloc(sizeof(*fake_fixture)));
  tsi_test_fixture_init(&fake_fixture->base);
  fake_fixture->base.vtable = &vtable;
  return &fake_fixture->base;
}

void fake_tsi_test_do_handshake_tiny_handshake_buffer() {
  tsi_test_fixture* fixture = fake_tsi_test_fixture_create();
  fixture->handshake_buffer_size = TSI_TEST_TINY_HANDSHAKE_BUFFER_SIZE;
  tsi_test_do_handshake(fixture);
  tsi_test_fixture_destroy(fixture);
}

void fake_tsi_test_do_handshake_small_handshake_buffer() {
  tsi_test_fixture* fixture = fake_tsi_test_fixture_create();
  fixture->handshake_buffer_size = TSI_TEST_SMALL_HANDSHAKE_BUFFER_SIZE;
  tsi_test_do_handshake(fixture);
  tsi_test_fixture_destroy(fixture);
}

void fake_tsi_test_do_handshake() {
  tsi_test_fixture* fixture = fake_tsi_test_fixture_create();
  tsi_test_do_handshake(fixture);
  tsi_test_fixture_destroy(fixture);
}

void fake_tsi_test_do_round_trip_for_all_configs() {
  unsigned int* bit_array = static_cast<unsigned int*>(
      gpr_zalloc(sizeof(unsigned int) * TSI_TEST_NUM_OF_ARGUMENTS));
  const unsigned int mask = 1U << (TSI_TEST_NUM_OF_ARGUMENTS - 1);
  for (unsigned int val = 0; val < TSI_TEST_NUM_OF_COMBINATIONS; val++) {
    unsigned int v = val;
    for (unsigned int ind = 0; ind < TSI_TEST_NUM_OF_ARGUMENTS; ind++) {
      bit_array[ind] = (v & mask) ? 1 : 0;
      v <<= 1;
    }
    tsi_test_fixture* fixture = fake_tsi_test_fixture_create();
    fake_tsi_test_fixture* fake_fixture =
        reinterpret_cast<fake_tsi_test_fixture*>(fixture);
    tsi_test_frame_protector_config_destroy(fake_fixture->base.config);
    fake_fixture->base.config = tsi_test_frame_protector_config_create(
        bit_array[0], bit_array[1], bit_array[2], bit_array[3], bit_array[4],
        bit_array[5], bit_array[6]);
    tsi_test_do_round_trip(&fake_fixture->base);
    tsi_test_fixture_destroy(fixture);
  }
  gpr_free(bit_array);
}

void fake_tsi_test_do_round_trip_odd_buffer_size() {
  const size_t odd_sizes[] = {1025, 2051, 4103, 8207, 16409};
  const size_t size = sizeof(odd_sizes) / sizeof(size_t);
  for (size_t ind1 = 0; ind1 < size; ind1++) {
    for (size_t ind2 = 0; ind2 < size; ind2++) {
      for (size_t ind3 = 0; ind3 < size; ind3++) {
        for (size_t ind4 = 0; ind4 < size; ind4++) {
          for (size_t ind5 = 0; ind5 < size; ind5++) {
            tsi_test_fixture* fixture = fake_tsi_test_fixture_create();
            fake_tsi_test_fixture* fake_fixture =
                reinterpret_cast<fake_tsi_test_fixture*>(fixture);
            tsi_test_frame_protector_config_set_buffer_size(
                fake_fixture->base.config, odd_sizes[ind1], odd_sizes[ind2],
                odd_sizes[ind3], odd_sizes[ind4], odd_sizes[ind5]);
            tsi_test_do_round_trip(&fake_fixture->base);
            tsi_test_fixture_destroy(fixture);
          }
        }
      }
    }
  }
}

int main(int argc, char** argv) {
  grpc::testing::TestEnvironment env(argc, argv);
  grpc_init();
  fake_tsi_test_do_handshake_tiny_handshake_buffer();
  fake_tsi_test_do_handshake_small_handshake_buffer();
  fake_tsi_test_do_handshake();
  fake_tsi_test_do_round_trip_for_all_configs();
  fake_tsi_test_do_round_trip_odd_buffer_size();
  grpc_shutdown();
  return 0;
}
