/*
 *
 * 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 "test/core/bad_client/bad_client.h"

#include <stdio.h>

#include <grpc/support/alloc.h>
#include <grpc/support/string_util.h>
#include <grpc/support/sync.h>
#include <grpc/support/thd.h>

#include "src/core/ext/filters/http/server/http_server_filter.h"
#include "src/core/ext/transport/chttp2/transport/chttp2_transport.h"
#include "src/core/lib/channel/channel_stack.h"
#include "src/core/lib/iomgr/endpoint_pair.h"
#include "src/core/lib/slice/slice_internal.h"
#include "src/core/lib/support/murmur_hash.h"
#include "src/core/lib/support/string.h"
#include "src/core/lib/surface/completion_queue.h"
#include "src/core/lib/surface/server.h"

typedef struct {
  grpc_server* server;
  grpc_completion_queue* cq;
  grpc_bad_client_server_side_validator validator;
  void* registered_method;
  gpr_event done_thd;
  gpr_event done_write;
} thd_args;

static void thd_func(void* arg) {
  thd_args* a = (thd_args*)arg;
  a->validator(a->server, a->cq, a->registered_method);
  gpr_event_set(&a->done_thd, (void*)1);
}

static void done_write(grpc_exec_ctx* exec_ctx, void* arg, grpc_error* error) {
  thd_args* a = (thd_args*)arg;
  gpr_event_set(&a->done_write, (void*)1);
}

static void server_setup_transport(void* ts, grpc_transport* transport) {
  thd_args* a = (thd_args*)ts;
  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
  grpc_server_setup_transport(&exec_ctx, a->server, transport, NULL,
                              grpc_server_get_channel_args(a->server));
  grpc_exec_ctx_finish(&exec_ctx);
}

static void read_done(grpc_exec_ctx* exec_ctx, void* arg, grpc_error* error) {
  gpr_event* read_done = (gpr_event*)arg;
  gpr_event_set(read_done, (void*)1);
}

void grpc_run_bad_client_test(
    grpc_bad_client_server_side_validator server_validator,
    grpc_bad_client_client_stream_validator client_validator,
    const char* client_payload, size_t client_payload_length, uint32_t flags) {
  grpc_endpoint_pair sfd;
  thd_args a;
  gpr_thd_id id;
  char* hex;
  grpc_transport* transport;
  grpc_slice slice =
      grpc_slice_from_copied_buffer(client_payload, client_payload_length);
  grpc_slice_buffer outgoing;
  grpc_closure done_write_closure;
  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
  grpc_completion_queue* shutdown_cq;

  if (client_payload_length < 4 * 1024) {
    hex = gpr_dump(client_payload, client_payload_length,
                   GPR_DUMP_HEX | GPR_DUMP_ASCII);

    /* Add a debug log */
    gpr_log(GPR_INFO, "TEST: %s", hex);

    gpr_free(hex);
  } else {
    gpr_log(GPR_INFO, "TEST: (%" PRIdPTR " byte long string)",
            client_payload_length);
  }

  /* Init grpc */
  grpc_init();

  /* Create endpoints */
  sfd = grpc_iomgr_create_endpoint_pair("fixture", NULL);

  /* Create server, completion events */
  a.server = grpc_server_create(NULL, NULL);
  a.cq = grpc_completion_queue_create_for_next(NULL);
  gpr_event_init(&a.done_thd);
  gpr_event_init(&a.done_write);
  a.validator = server_validator;
  grpc_server_register_completion_queue(a.server, a.cq, NULL);
  a.registered_method =
      grpc_server_register_method(a.server, GRPC_BAD_CLIENT_REGISTERED_METHOD,
                                  GRPC_BAD_CLIENT_REGISTERED_HOST,
                                  GRPC_SRM_PAYLOAD_READ_INITIAL_BYTE_BUFFER, 0);
  grpc_server_start(a.server);
  transport = grpc_create_chttp2_transport(&exec_ctx, NULL, sfd.server, false);
  server_setup_transport(&a, transport);
  grpc_chttp2_transport_start_reading(&exec_ctx, transport, NULL);
  grpc_exec_ctx_finish(&exec_ctx);

  /* Bind everything into the same pollset */
  grpc_endpoint_add_to_pollset(&exec_ctx, sfd.client, grpc_cq_pollset(a.cq));
  grpc_endpoint_add_to_pollset(&exec_ctx, sfd.server, grpc_cq_pollset(a.cq));

  /* Check a ground truth */
  GPR_ASSERT(grpc_server_has_open_connections(a.server));

  /* Start validator */
  gpr_thd_new(&id, thd_func, &a, NULL);

  grpc_slice_buffer_init(&outgoing);
  grpc_slice_buffer_add(&outgoing, slice);
  GRPC_CLOSURE_INIT(&done_write_closure, done_write, &a,
                    grpc_schedule_on_exec_ctx);

  /* Write data */
  grpc_endpoint_write(&exec_ctx, sfd.client, &outgoing, &done_write_closure);
  grpc_exec_ctx_finish(&exec_ctx);

  /* Await completion, unless the request is large and write may not finish
   * before the peer shuts down. */
  if (!(flags & GRPC_BAD_CLIENT_LARGE_REQUEST)) {
    GPR_ASSERT(
        gpr_event_wait(&a.done_write, grpc_timeout_seconds_to_deadline(5)));
  }

  if (flags & GRPC_BAD_CLIENT_DISCONNECT) {
    grpc_endpoint_shutdown(
        &exec_ctx, sfd.client,
        GRPC_ERROR_CREATE_FROM_STATIC_STRING("Forced Disconnect"));
    grpc_endpoint_destroy(&exec_ctx, sfd.client);
    grpc_exec_ctx_finish(&exec_ctx);
    sfd.client = NULL;
  }

  GPR_ASSERT(gpr_event_wait(&a.done_thd, grpc_timeout_seconds_to_deadline(5)));

  if (sfd.client != NULL) {
    // Validate client stream, if requested.
    if (client_validator != NULL) {
      gpr_timespec deadline = grpc_timeout_seconds_to_deadline(5);
      grpc_slice_buffer incoming;
      grpc_slice_buffer_init(&incoming);
      // We may need to do multiple reads to read the complete server response.
      while (true) {
        gpr_event read_done_event;
        gpr_event_init(&read_done_event);
        grpc_closure read_done_closure;
        GRPC_CLOSURE_INIT(&read_done_closure, read_done, &read_done_event,
                          grpc_schedule_on_exec_ctx);
        grpc_endpoint_read(&exec_ctx, sfd.client, &incoming,
                           &read_done_closure);
        grpc_exec_ctx_finish(&exec_ctx);
        do {
          GPR_ASSERT(gpr_time_cmp(deadline, gpr_now(deadline.clock_type)) > 0);
          GPR_ASSERT(grpc_completion_queue_next(
                         a.cq, grpc_timeout_milliseconds_to_deadline(100), NULL)
                         .type == GRPC_QUEUE_TIMEOUT);
        } while (!gpr_event_get(&read_done_event));
        if (client_validator(&incoming)) break;
        gpr_log(GPR_INFO,
                "client validator failed; trying additional read "
                "in case we didn't get all the data");
      }
      grpc_slice_buffer_destroy_internal(&exec_ctx, &incoming);
    }
    // Shutdown.
    grpc_endpoint_shutdown(
        &exec_ctx, sfd.client,
        GRPC_ERROR_CREATE_FROM_STATIC_STRING("Test Shutdown"));
    grpc_endpoint_destroy(&exec_ctx, sfd.client);
    grpc_exec_ctx_finish(&exec_ctx);
  }

  GPR_ASSERT(
      gpr_event_wait(&a.done_write, grpc_timeout_seconds_to_deadline(1)));
  shutdown_cq = grpc_completion_queue_create_for_pluck(NULL);
  grpc_server_shutdown_and_notify(a.server, shutdown_cq, NULL);
  GPR_ASSERT(grpc_completion_queue_pluck(
                 shutdown_cq, NULL, grpc_timeout_seconds_to_deadline(1), NULL)
                 .type == GRPC_OP_COMPLETE);
  grpc_completion_queue_destroy(shutdown_cq);
  grpc_server_destroy(a.server);
  grpc_completion_queue_destroy(a.cq);
  grpc_slice_buffer_destroy_internal(&exec_ctx, &outgoing);

  grpc_exec_ctx_finish(&exec_ctx);
  grpc_shutdown();
}