/*
 *
 * Copyright 2018 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 <string.h>

#include <grpc/grpc.h>

#include "src/core/lib/surface/server.h"
#include "test/core/bad_client/bad_client.h"
#include "test/core/end2end/cq_verifier.h"

#define PFX_STR                      \
  "PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n" \
  "\x00\x00\x00\x04\x00\x00\x00\x00\x00" /* settings frame */

#define HEADER_STR                                                         \
  "\x00\x00\xc9\x01\x04\x00\x00\x00\x01" /* headers: generated from        \
                                            simple_request.headers in this \
                                            directory */                   \
  "\x10\x05:path\x08/foo/bar"                                              \
  "\x10\x07:scheme\x04http"                                                \
  "\x10\x07:method\x04POST"                                                \
  "\x10\x0a:authority\x09localhost"                                        \
  "\x10\x0c"                                                               \
  "content-type\x10"                                                       \
  "application/grpc"                                                       \
  "\x10\x14grpc-accept-encoding\x15"                                       \
  "deflate,identity,gzip"                                                  \
  "\x10\x02te\x08trailers"                                                 \
  "\x10\x0auser-agent\"bad-client grpc-c/0.12.0.0 (linux)"

#define PAYLOAD_STR                      \
  "\x00\x00\x20\x00\x00\x00\x00\x00\x01" \
  "\x00\x00\x00\x00"

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

static void verifier(grpc_server* server, grpc_completion_queue* cq,
                     void* /*registered_method*/) {
  grpc_call_error error;
  grpc_call* s;
  grpc_call_details call_details;
  grpc_byte_buffer* request_payload_recv = nullptr;
  grpc_op* op;
  grpc_op ops[6];
  cq_verifier* cqv = cq_verifier_create(cq);
  grpc_metadata_array request_metadata_recv;
  int was_cancelled = 2;

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

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

  GPR_ASSERT(0 == grpc_slice_str_cmp(call_details.host, "localhost"));
  GPR_ASSERT(0 == grpc_slice_str_cmp(call_details.method, "/foo/bar"));

  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_RECV_MESSAGE;
  op->data.recv_message.recv_message = &request_payload_recv;
  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_verify(cqv);

  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_STATUS_FROM_SERVER;
  op->data.send_status_from_server.trailing_metadata_count = 0;
  op->data.send_status_from_server.status = GRPC_STATUS_UNIMPLEMENTED;
  grpc_slice status_details = grpc_slice_from_static_string("xyz");
  op->data.send_status_from_server.status_details = &status_details;
  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(103), 1);

  grpc_metadata_array_destroy(&request_metadata_recv);
  grpc_call_details_destroy(&call_details);
  grpc_call_unref(s);
  cq_verifier_destroy(cqv);
}

int main(int argc, char** argv) {
  grpc::testing::TestEnvironment env(&argc, argv);
  grpc_init();

  /* Verify that sending multiple headers doesn't segfault */
  GRPC_RUN_BAD_CLIENT_TEST(verifier, nullptr,
                           PFX_STR HEADER_STR HEADER_STR PAYLOAD_STR, 0);
  GRPC_RUN_BAD_CLIENT_TEST(verifier, nullptr,
                           PFX_STR HEADER_STR HEADER_STR HEADER_STR PAYLOAD_STR,
                           0);
  grpc_shutdown();
  return 0;
}
