/*
 *
 * 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 <stdio.h>
#include <string.h>

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

#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/gpr/useful.h"
#include "src/core/lib/iomgr/exec_ctx.h"
#include "src/core/lib/slice/slice_internal.h"
#include "test/core/end2end/cq_verifier.h"
#include "test/core/end2end/end2end_tests.h"
#include "test/core/end2end/tests/cancel_test_helpers.h"

static void* tag(intptr_t t) { return reinterpret_cast<void*>(t); }

static grpc_end2end_test_fixture begin_test(grpc_end2end_test_config config,
                                            const char* test_name,
                                            cancellation_mode mode,
                                            bool use_service_config,
                                            grpc_channel_args* client_args,
                                            grpc_channel_args* server_args) {
  grpc_end2end_test_fixture f;
  gpr_log(GPR_INFO, "Running test: %s/%s/%s/%s", test_name, config.name,
          mode.name, use_service_config ? "service_config" : "client_api");
  f = config.create_fixture(client_args, server_args);
  config.init_server(&f, server_args);
  config.init_client(&f, client_args);
  return f;
}

static gpr_timespec n_seconds_from_now(int n) {
  return grpc_timeout_seconds_to_deadline(n);
}

static gpr_timespec five_seconds_from_now(void) {
  return n_seconds_from_now(5);
}

static void drain_cq(grpc_completion_queue* cq) {
  grpc_event ev;
  do {
    ev = grpc_completion_queue_next(cq, five_seconds_from_now(), nullptr);
  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
}

static void shutdown_server(grpc_end2end_test_fixture* f) {
  if (!f->server) return;
  grpc_server_shutdown_and_notify(f->server, f->cq, tag(1000));
  grpc_event ev;
  do {
    ev = grpc_completion_queue_next(f->cq, grpc_timeout_seconds_to_deadline(5),
                                    nullptr);
  } while (ev.type != GRPC_OP_COMPLETE || ev.tag != tag(1000));
  grpc_server_destroy(f->server);
  f->server = nullptr;
}

static void shutdown_client(grpc_end2end_test_fixture* f) {
  if (!f->client) return;
  grpc_channel_destroy(f->client);
  f->client = nullptr;
}

static void end_test(grpc_end2end_test_fixture* f) {
  shutdown_server(f);
  shutdown_client(f);

  grpc_completion_queue_shutdown(f->cq);
  drain_cq(f->cq);
  grpc_completion_queue_destroy(f->cq);
}

/* Cancel after accept, no payload */
static void test_cancel_after_round_trip(grpc_end2end_test_config config,
                                         cancellation_mode mode,
                                         bool use_service_config) {
  grpc_op ops[6];
  grpc_op* op;
  grpc_call* c;
  grpc_call* s;
  grpc_metadata_array initial_metadata_recv;
  grpc_metadata_array trailing_metadata_recv;
  grpc_metadata_array request_metadata_recv;
  grpc_call_details call_details;
  grpc_status_code status;
  grpc_call_error error;
  grpc_slice details;
  grpc_byte_buffer* request_payload_recv = nullptr;
  grpc_byte_buffer* response_payload_recv = nullptr;
  grpc_slice request_payload_slice =
      grpc_slice_from_copied_string("hello world");
  grpc_slice response_payload_slice =
      grpc_slice_from_copied_string("hello you");
  grpc_byte_buffer* request_payload =
      grpc_raw_byte_buffer_create(&request_payload_slice, 1);
  grpc_byte_buffer* response_payload1 =
      grpc_raw_byte_buffer_create(&response_payload_slice, 1);
  grpc_byte_buffer* response_payload2 =
      grpc_raw_byte_buffer_create(&response_payload_slice, 1);
  int was_cancelled = 2;

  grpc_channel_args* args = nullptr;
  if (use_service_config) {
    grpc_arg arg;
    arg.type = GRPC_ARG_STRING;
    arg.key = const_cast<char*>(GRPC_ARG_SERVICE_CONFIG);
    arg.value.string = const_cast<char*>(
        "{\n"
        "  \"methodConfig\": [ {\n"
        "    \"name\": [\n"
        "      { \"service\": \"service\", \"method\": \"method\" }\n"
        "    ],\n"
        "    \"timeout\": \"5s\"\n"
        "  } ]\n"
        "}");
    args = grpc_channel_args_copy_and_add(args, &arg, 1);
  }

  grpc_end2end_test_fixture f =
      begin_test(config, "cancel_after_round_trip", mode, use_service_config,
                 args, nullptr);
  cq_verifier* cqv = cq_verifier_create(f.cq);

  gpr_timespec deadline = use_service_config
                              ? gpr_inf_future(GPR_CLOCK_MONOTONIC)
                              : five_seconds_from_now();
  c = grpc_channel_create_call(f.client, nullptr, GRPC_PROPAGATE_DEFAULTS, f.cq,
                               grpc_slice_from_static_string("/service/method"),
                               nullptr, deadline, nullptr);
  GPR_ASSERT(c);

  grpc_metadata_array_init(&initial_metadata_recv);
  grpc_metadata_array_init(&trailing_metadata_recv);
  grpc_metadata_array_init(&request_metadata_recv);
  grpc_call_details_init(&call_details);

  memset(ops, 0, sizeof(ops));
  op = ops;
  op->op = GRPC_OP_SEND_INITIAL_METADATA;
  op->data.send_initial_metadata.count = 0;
  op->flags = 0;
  op->reserved = nullptr;
  op++;
  op->op = GRPC_OP_SEND_MESSAGE;
  op->data.send_message.send_message = request_payload;
  op->flags = 0;
  op->reserved = nullptr;
  op++;
  op->op = GRPC_OP_RECV_INITIAL_METADATA;
  op->data.recv_initial_metadata.recv_initial_metadata = &initial_metadata_recv;
  op->flags = 0;
  op->reserved = nullptr;
  op++;
  op->op = GRPC_OP_RECV_MESSAGE;
  op->data.recv_message.recv_message = &response_payload_recv;
  op->flags = 0;
  op->reserved = nullptr;
  op++;
  error = grpc_call_start_batch(c, ops, static_cast<size_t>(op - ops), tag(1),
                                nullptr);
  GPR_ASSERT(GRPC_CALL_OK == error);

  error =
      grpc_server_request_call(f.server, &s, &call_details,
                               &request_metadata_recv, f.cq, f.cq, tag(101));
  GPR_ASSERT(GRPC_CALL_OK == error);
  CQ_EXPECT_COMPLETION(cqv, tag(101), 1);
  cq_verify(cqv);

  memset(ops, 0, sizeof(ops));
  op = ops;
  op->op = GRPC_OP_RECV_MESSAGE;
  op->data.recv_message.recv_message = &request_payload_recv;
  op->flags = 0;
  op->reserved = nullptr;
  op++;
  op->op = GRPC_OP_SEND_INITIAL_METADATA;
  op->data.send_initial_metadata.count = 0;
  op->flags = 0;
  op->reserved = nullptr;
  op++;
  op->op = GRPC_OP_SEND_MESSAGE;
  op->data.send_message.send_message = response_payload1;
  op->flags = 0;
  op->reserved = nullptr;
  op++;
  error = grpc_call_start_batch(s, ops, static_cast<size_t>(op - ops), tag(102),
                                nullptr);
  GPR_ASSERT(GRPC_CALL_OK == error);

  CQ_EXPECT_COMPLETION(cqv, tag(102), 1);
  CQ_EXPECT_COMPLETION(cqv, tag(1), 1);
  cq_verify(cqv);

  grpc_byte_buffer_destroy(request_payload_recv);
  grpc_byte_buffer_destroy(response_payload_recv);
  request_payload_recv = nullptr;
  response_payload_recv = nullptr;

  memset(ops, 0, sizeof(ops));
  op = ops;
  op->op = GRPC_OP_RECV_STATUS_ON_CLIENT;
  op->data.recv_status_on_client.trailing_metadata = &trailing_metadata_recv;
  op->data.recv_status_on_client.status = &status;
  op->data.recv_status_on_client.status_details = &details;
  op->flags = 0;
  op->reserved = nullptr;
  op++;
  op->op = GRPC_OP_RECV_MESSAGE;
  op->data.recv_message.recv_message = &response_payload_recv;
  op->flags = 0;
  op->reserved = nullptr;
  op++;
  error = grpc_call_start_batch(c, ops, static_cast<size_t>(op - ops), tag(2),
                                nullptr);
  GPR_ASSERT(GRPC_CALL_OK == error);

  GPR_ASSERT(GRPC_CALL_OK == mode.initiate_cancel(c, nullptr));

  memset(ops, 0, sizeof(ops));
  op = ops;
  op->op = GRPC_OP_RECV_CLOSE_ON_SERVER;
  op->data.recv_close_on_server.cancelled = &was_cancelled;
  op->flags = 0;
  op->reserved = nullptr;
  op++;
  op->op = GRPC_OP_SEND_MESSAGE;
  op->data.send_message.send_message = response_payload2;
  op->flags = 0;
  op->reserved = nullptr;
  op++;
  error = grpc_call_start_batch(s, ops, static_cast<size_t>(op - ops), tag(103),
                                nullptr);
  GPR_ASSERT(GRPC_CALL_OK == error);

  CQ_EXPECT_COMPLETION(cqv, tag(2), 1);
  CQ_EXPECT_COMPLETION(cqv, tag(103), 1);
  cq_verify(cqv);

  GPR_ASSERT(status == mode.expect_status || status == GRPC_STATUS_INTERNAL);
  GPR_ASSERT(was_cancelled == 1);

  grpc_metadata_array_destroy(&initial_metadata_recv);
  grpc_metadata_array_destroy(&trailing_metadata_recv);
  grpc_metadata_array_destroy(&request_metadata_recv);
  grpc_call_details_destroy(&call_details);

  grpc_byte_buffer_destroy(request_payload);
  grpc_byte_buffer_destroy(response_payload1);
  grpc_byte_buffer_destroy(response_payload2);
  grpc_byte_buffer_destroy(request_payload_recv);
  grpc_byte_buffer_destroy(response_payload_recv);
  grpc_slice_unref(details);

  grpc_call_unref(c);
  grpc_call_unref(s);

  if (args != nullptr) {
    grpc_core::ExecCtx exec_ctx;
    grpc_channel_args_destroy(args);
  }

  cq_verifier_destroy(cqv);
  end_test(&f);
  config.tear_down_data(&f);
}

void cancel_after_round_trip(grpc_end2end_test_config config) {
  unsigned i;

  for (i = 0; i < GPR_ARRAY_SIZE(cancellation_modes); i++) {
    test_cancel_after_round_trip(config, cancellation_modes[i],
                                 false /* use_service_config */);
    if (config.feature_mask & FEATURE_MASK_SUPPORTS_CLIENT_CHANNEL &&
        cancellation_modes[i].expect_status == GRPC_STATUS_DEADLINE_EXCEEDED) {
      test_cancel_after_round_trip(config, cancellation_modes[i],
                                   true /* use_service_config */);
    }
  }
}

void cancel_after_round_trip_pre_init(void) {}
