/*
 *
 * Copyright 2015 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 "src/core/lib/iomgr/socket_mutator.h"

#include "src/core/lib/channel/channel_args.h"

#include <grpc/impl/codegen/grpc_types.h>
#include <grpc/support/sync.h>
#include <grpc/support/useful.h>

void grpc_socket_mutator_init(grpc_socket_mutator *mutator,
                              const grpc_socket_mutator_vtable *vtable) {
  mutator->vtable = vtable;
  gpr_ref_init(&mutator->refcount, 1);
}

grpc_socket_mutator *grpc_socket_mutator_ref(grpc_socket_mutator *mutator) {
  gpr_ref(&mutator->refcount);
  return mutator;
}

bool grpc_socket_mutator_mutate_fd(grpc_socket_mutator *mutator, int fd) {
  return mutator->vtable->mutate_fd(fd, mutator);
}

int grpc_socket_mutator_compare(grpc_socket_mutator *a,
                                grpc_socket_mutator *b) {
  int c = GPR_ICMP(a, b);
  if (c != 0) {
    grpc_socket_mutator *sma = a;
    grpc_socket_mutator *smb = b;
    c = GPR_ICMP(sma->vtable, smb->vtable);
    if (c == 0) {
      c = sma->vtable->compare(sma, smb);
    }
  }
  return c;
}

void grpc_socket_mutator_unref(grpc_socket_mutator *mutator) {
  if (gpr_unref(&mutator->refcount)) {
    mutator->vtable->destory(mutator);
  }
}

static void *socket_mutator_arg_copy(void *p) {
  return grpc_socket_mutator_ref(p);
}

static void socket_mutator_arg_destroy(grpc_exec_ctx *exec_ctx, void *p) {
  grpc_socket_mutator_unref(p);
}

static int socket_mutator_cmp(void *a, void *b) {
  return grpc_socket_mutator_compare((grpc_socket_mutator *)a,
                                     (grpc_socket_mutator *)b);
}

static const grpc_arg_pointer_vtable socket_mutator_arg_vtable = {
    socket_mutator_arg_copy, socket_mutator_arg_destroy, socket_mutator_cmp};

grpc_arg grpc_socket_mutator_to_arg(grpc_socket_mutator *mutator) {
  return grpc_channel_arg_pointer_create(GRPC_ARG_SOCKET_MUTATOR, mutator,
                                         &socket_mutator_arg_vtable);
}