/*
 *
 * Copyright 2016, 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 "test/core/end2end/end2end_tests.h"

#include <limits.h>
#include <stdbool.h>
#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 <grpc/support/useful.h>
#include "src/core/lib/channel/channel_stack_builder.h"
#include "src/core/lib/surface/channel_init.h"
#include "test/core/end2end/cq_verifier.h"

enum { TIMEOUT = 200000 };

static bool g_enable_filter = false;

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

static grpc_end2end_test_fixture begin_test(grpc_end2end_test_config config,
                                            const char *test_name,
                                            grpc_channel_args *client_args,
                                            grpc_channel_args *server_args) {
  grpc_end2end_test_fixture f;
  gpr_log(GPR_INFO, "%s/%s", test_name, config.name);
  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_time(int n) {
  return GRPC_TIMEOUT_SECONDS_TO_DEADLINE(n);
}

static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }

static void drain_cq(grpc_completion_queue *cq) {
  grpc_event ev;
  do {
    ev = grpc_completion_queue_next(cq, five_seconds_time(), NULL);
  } 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));
  GPR_ASSERT(grpc_completion_queue_pluck(
                 f->cq, tag(1000), GRPC_TIMEOUT_SECONDS_TO_DEADLINE(5), NULL)
                 .type == GRPC_OP_COMPLETE);
  grpc_server_destroy(f->server);
  f->server = NULL;
}

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

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);
}

// Simple request via a server filter that always fails to initialize
// the call.
static void test_request(grpc_end2end_test_config config) {
  grpc_call *c;
  grpc_call *s;
  gpr_slice request_payload_slice = gpr_slice_from_copied_string("hello world");
  grpc_byte_buffer *request_payload =
      grpc_raw_byte_buffer_create(&request_payload_slice, 1);
  gpr_timespec deadline = five_seconds_time();
  grpc_end2end_test_fixture f =
      begin_test(config, "filter_call_init_fails", NULL, NULL);
  cq_verifier *cqv = cq_verifier_create(f.cq);
  grpc_op ops[6];
  grpc_op *op;
  grpc_metadata_array initial_metadata_recv;
  grpc_metadata_array trailing_metadata_recv;
  grpc_metadata_array request_metadata_recv;
  grpc_byte_buffer *request_payload_recv = NULL;
  grpc_call_details call_details;
  grpc_status_code status;
  grpc_call_error error;
  char *details = NULL;
  size_t details_capacity = 0;

  c = grpc_channel_create_call(f.client, NULL, GRPC_PROPAGATE_DEFAULTS, f.cq,
                               "/foo", "foo.test.google.fr", deadline, NULL);
  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->data.send_initial_metadata.metadata = NULL;
  op->flags = 0;
  op->reserved = NULL;
  op++;
  op->op = GRPC_OP_SEND_MESSAGE;
  op->data.send_message = request_payload;
  op->flags = 0;
  op->reserved = NULL;
  op++;
  op->op = GRPC_OP_SEND_CLOSE_FROM_CLIENT;
  op->flags = 0;
  op->reserved = NULL;
  op++;
  op->op = GRPC_OP_RECV_INITIAL_METADATA;
  op->data.recv_initial_metadata = &initial_metadata_recv;
  op->flags = 0;
  op->reserved = NULL;
  op++;
  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->data.recv_status_on_client.status_details_capacity = &details_capacity;
  op->flags = 0;
  op->reserved = NULL;
  op++;
  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
  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(1), 1);
  cq_verify(cqv);

  GPR_ASSERT(status == GRPC_STATUS_PERMISSION_DENIED);
  GPR_ASSERT(0 == strcmp(details, "access denied"));

  gpr_free(details);
  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_call_destroy(c);

  cq_verifier_destroy(cqv);

  grpc_byte_buffer_destroy(request_payload);
  grpc_byte_buffer_destroy(request_payload_recv);

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

/*******************************************************************************
 * Test filter - always fails to initialize a call
 */

static grpc_error *init_call_elem(grpc_exec_ctx *exec_ctx,
                                  grpc_call_element *elem,
                                  grpc_call_element_args *args) {
  return grpc_error_set_int(GRPC_ERROR_CREATE("access denied"),
                            GRPC_ERROR_INT_GRPC_STATUS,
                            GRPC_STATUS_PERMISSION_DENIED);
}

static void destroy_call_elem(grpc_exec_ctx *exec_ctx, grpc_call_element *elem,
                              const grpc_call_final_info *final_info,
                              void *and_free_memory) {}

static void init_channel_elem(grpc_exec_ctx *exec_ctx,
                              grpc_channel_element *elem,
                              grpc_channel_element_args *args) {}

static void destroy_channel_elem(grpc_exec_ctx *exec_ctx,
                                 grpc_channel_element *elem) {}

static const grpc_channel_filter test_filter = {
    grpc_call_next_op,
    grpc_channel_next_op,
    0,
    init_call_elem,
    grpc_call_stack_ignore_set_pollset_or_pollset_set,
    destroy_call_elem,
    0,
    init_channel_elem,
    destroy_channel_elem,
    grpc_call_next_get_peer,
    "filter_call_init_fails"};

/*******************************************************************************
 * Registration
 */

static bool maybe_add_filter(grpc_channel_stack_builder *builder, void *arg) {
  if (g_enable_filter) {
    // Want to add the filter as close to the end as possible, to make
    // sure that all of the filters work well together.  However, we
    // can't add it at the very end, because the connected channel filter
    // must be the last one.  So we add it right before the last one.
    grpc_channel_stack_builder_iterator *it =
        grpc_channel_stack_builder_create_iterator_at_last(builder);
    GPR_ASSERT(grpc_channel_stack_builder_move_prev(it));
    const bool retval = grpc_channel_stack_builder_add_filter_before(
        it, &test_filter, NULL, NULL);
    grpc_channel_stack_builder_iterator_destroy(it);
    return retval;
  } else {
    return true;
  }
}

static void init_plugin(void) {
  grpc_channel_init_register_stage(GRPC_SERVER_CHANNEL, INT_MAX,
                                   maybe_add_filter, NULL);
}

static void destroy_plugin(void) {}

void filter_call_init_fails(grpc_end2end_test_config config) {
  g_enable_filter = true;
  test_request(config);
  g_enable_filter = false;
}

void filter_call_init_fails_pre_init(void) {
  grpc_register_plugin(init_plugin, destroy_plugin);
}