/*
 *
 * Copyright 2014, Google Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include <grpc/grpc.h>

#include <string.h>

#include <grpc/support/log.h>
#include <grpc/support/time.h>
#include <grpc/byte_buffer.h>
#include "test/core/util/test_config.h"

enum { WRITE_SLICE_LENGTH = 1024, TOTAL_BYTES = 102400 };

/* Start write the next slice, fill slice.data[0..length - 1] with first % 256,
   (first + 1) % 256, ... (first + length - 1) % 256.
   Produce a GRPC_WRITE_ACCEPTED event  */
static void start_write_next_slice(grpc_call *call, int first, int length) {
  int i = 0;
  grpc_byte_buffer *byte_buffer = NULL;
  gpr_slice slice = gpr_slice_malloc(length);
  for (i = 0; i < length; i++)
    GPR_SLICE_START_PTR(slice)[i] = (first + i) % 256;
  byte_buffer = grpc_byte_buffer_create(&slice, 1);
  GPR_ASSERT(grpc_call_start_write(call, byte_buffer, (void *)1, 0) ==
             GRPC_CALL_OK);
  gpr_slice_unref(slice);
  grpc_byte_buffer_destroy(byte_buffer);
}

int main(int argc, char **argv) {
  grpc_channel *channel = NULL;
  grpc_call *call = NULL;
  grpc_event *ev = NULL;
  grpc_byte_buffer_reader *bb_reader = NULL;
  grpc_completion_queue *cq = NULL;
  int bytes_written = 0;
  int bytes_read = 0;
  unsigned i = 0;
  int waiting_finishes;
  gpr_slice read_slice;

  grpc_test_init(argc, argv);

  grpc_init();

  cq = grpc_completion_queue_create();

  GPR_ASSERT(argc == 2);
  channel = grpc_channel_create(argv[1], NULL);
  call = grpc_channel_create_call(
      channel, "/foo", "localhost",
      gpr_time_add(gpr_time_from_seconds(5), gpr_now()));
  GPR_ASSERT(grpc_call_invoke(call, cq, (void *)1, (void *)1, 0) ==
             GRPC_CALL_OK);

  start_write_next_slice(call, bytes_written, WRITE_SLICE_LENGTH);
  bytes_written += WRITE_SLICE_LENGTH;
  GPR_ASSERT(grpc_call_start_read(call, (void *)1) == GRPC_CALL_OK);
  waiting_finishes = 2;
  while (waiting_finishes) {
    ev = grpc_completion_queue_next(cq, gpr_inf_future);
    switch (ev->type) {
      case GRPC_WRITE_ACCEPTED:
        if (bytes_written < TOTAL_BYTES) {
          start_write_next_slice(call, bytes_written, WRITE_SLICE_LENGTH);
          bytes_written += WRITE_SLICE_LENGTH;
        } else {
          GPR_ASSERT(grpc_call_writes_done(call, (void *)1) == GRPC_CALL_OK);
        }
        break;
      case GRPC_CLIENT_METADATA_READ:
        break;
      case GRPC_READ:
        bb_reader = grpc_byte_buffer_reader_create(ev->data.read);
        while (grpc_byte_buffer_reader_next(bb_reader, &read_slice)) {
          for (i = 0; i < GPR_SLICE_LENGTH(read_slice); i++) {
            GPR_ASSERT(GPR_SLICE_START_PTR(read_slice)[i] == bytes_read % 256);
            bytes_read++;
          }
          gpr_slice_unref(read_slice);
        }
        grpc_byte_buffer_reader_destroy(bb_reader);
        if (bytes_read < TOTAL_BYTES) {
          GPR_ASSERT(grpc_call_start_read(call, (void *)1) == GRPC_CALL_OK);
        }
        break;
      case GRPC_FINISHED:
      case GRPC_FINISH_ACCEPTED:
        waiting_finishes--;
        break;
      default:
        GPR_ASSERT(0 && "unexpected event");
        break;
    }
    grpc_event_finish(ev);
  }
  GPR_ASSERT(bytes_read == TOTAL_BYTES);
  gpr_log(GPR_INFO, "All data have been successfully echoed");

  grpc_call_destroy(call);
  grpc_channel_destroy(channel);
  grpc_completion_queue_destroy(cq);

  grpc_shutdown();

  return 0;
}