/*
 *
 * 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 "src/core/surface/completion_queue.h"

#include "src/core/iomgr/iomgr.h"
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/thd.h>
#include <grpc/support/time.h>
#include <grpc/support/useful.h>
#include "test/core/util/test_config.h"

#define LOG_TEST() gpr_log(GPR_INFO, "%s", __FUNCTION__)

static void increment_int_on_finish(void *user_data, grpc_op_error error) {
  ++*(int *)user_data;
}

static void *create_test_tag() {
  static gpr_intptr i = 0;
  return (void *)(++i);
}

/* helper for tests to shutdown correctly and tersely */
static void shutdown_and_destroy(grpc_completion_queue *cc) {
  grpc_event *ev;
  grpc_completion_queue_shutdown(cc);
  ev = grpc_completion_queue_next(cc, gpr_inf_past);
  GPR_ASSERT(ev != NULL);
  GPR_ASSERT(ev->type == GRPC_QUEUE_SHUTDOWN);
  grpc_event_finish(ev);
  grpc_completion_queue_destroy(cc);
}

/* ensure we can create and destroy a completion channel */
static void test_no_op() {
  LOG_TEST();
  shutdown_and_destroy(grpc_completion_queue_create());
}

static void test_wait_empty() {
  grpc_completion_queue *cc;

  LOG_TEST();

  cc = grpc_completion_queue_create();
  GPR_ASSERT(grpc_completion_queue_next(cc, gpr_now()) == NULL);
  shutdown_and_destroy(cc);
}

static void test_cq_end_read() {
  grpc_event *ev;
  grpc_completion_queue *cc;
  int on_finish_called = 0;
  void *tag = create_test_tag();

  LOG_TEST();

  cc = grpc_completion_queue_create();

  grpc_cq_begin_op(cc, NULL, GRPC_READ);
  grpc_cq_end_read(cc, tag, NULL, increment_int_on_finish, &on_finish_called,
                   NULL);

  ev = grpc_completion_queue_next(cc, gpr_inf_past);
  GPR_ASSERT(ev != NULL);
  GPR_ASSERT(ev->type == GRPC_READ);
  GPR_ASSERT(ev->tag == tag);
  GPR_ASSERT(ev->data.read == NULL);
  GPR_ASSERT(on_finish_called == 0);
  grpc_event_finish(ev);
  GPR_ASSERT(on_finish_called == 1);

  shutdown_and_destroy(cc);
}

static void test_cq_end_invoke_accepted() {
  grpc_event *ev;
  grpc_completion_queue *cc;
  int on_finish_called = 0;
  void *tag = create_test_tag();

  LOG_TEST();

  cc = grpc_completion_queue_create();

  grpc_cq_begin_op(cc, NULL, GRPC_INVOKE_ACCEPTED);
  grpc_cq_end_invoke_accepted(cc, tag, NULL, increment_int_on_finish,
                              &on_finish_called, GRPC_OP_OK);

  ev = grpc_completion_queue_next(cc, gpr_inf_past);
  GPR_ASSERT(ev != NULL);
  GPR_ASSERT(ev->type == GRPC_INVOKE_ACCEPTED);
  GPR_ASSERT(ev->tag == tag);
  GPR_ASSERT(ev->data.invoke_accepted == GRPC_OP_OK);
  GPR_ASSERT(on_finish_called == 0);
  grpc_event_finish(ev);
  GPR_ASSERT(on_finish_called == 1);

  shutdown_and_destroy(cc);
}

static void test_cq_end_write_accepted() {
  grpc_event *ev;
  grpc_completion_queue *cc;
  int on_finish_called = 0;
  void *tag = create_test_tag();

  LOG_TEST();

  cc = grpc_completion_queue_create();

  grpc_cq_begin_op(cc, NULL, GRPC_WRITE_ACCEPTED);
  grpc_cq_end_write_accepted(cc, tag, NULL, increment_int_on_finish,
                             &on_finish_called, GRPC_OP_OK);

  ev = grpc_completion_queue_next(cc, gpr_inf_past);
  GPR_ASSERT(ev != NULL);
  GPR_ASSERT(ev->type == GRPC_WRITE_ACCEPTED);
  GPR_ASSERT(ev->tag == tag);
  GPR_ASSERT(ev->data.write_accepted == GRPC_OP_OK);
  GPR_ASSERT(on_finish_called == 0);
  grpc_event_finish(ev);
  GPR_ASSERT(on_finish_called == 1);

  shutdown_and_destroy(cc);
}

static void test_cq_end_finish_accepted() {
  grpc_event *ev;
  grpc_completion_queue *cc;
  int on_finish_called = 0;
  void *tag = create_test_tag();

  LOG_TEST();

  cc = grpc_completion_queue_create();

  grpc_cq_begin_op(cc, NULL, GRPC_FINISH_ACCEPTED);
  grpc_cq_end_finish_accepted(cc, tag, NULL, increment_int_on_finish,
                              &on_finish_called, GRPC_OP_OK);

  ev = grpc_completion_queue_next(cc, gpr_inf_past);
  GPR_ASSERT(ev != NULL);
  GPR_ASSERT(ev->type == GRPC_FINISH_ACCEPTED);
  GPR_ASSERT(ev->tag == tag);
  GPR_ASSERT(ev->data.finish_accepted == GRPC_OP_OK);
  GPR_ASSERT(on_finish_called == 0);
  grpc_event_finish(ev);
  GPR_ASSERT(on_finish_called == 1);

  shutdown_and_destroy(cc);
}

static void test_cq_end_client_metadata_read() {
  grpc_event *ev;
  grpc_completion_queue *cc;
  int on_finish_called = 0;
  void *tag = create_test_tag();

  LOG_TEST();

  cc = grpc_completion_queue_create();

  grpc_cq_begin_op(cc, NULL, GRPC_CLIENT_METADATA_READ);
  grpc_cq_end_client_metadata_read(cc, tag, NULL, increment_int_on_finish,
                                   &on_finish_called, 0, NULL);

  ev = grpc_completion_queue_next(cc, gpr_inf_past);
  GPR_ASSERT(ev != NULL);
  GPR_ASSERT(ev->type == GRPC_CLIENT_METADATA_READ);
  GPR_ASSERT(ev->tag == tag);
  GPR_ASSERT(ev->data.client_metadata_read.count == 0);
  GPR_ASSERT(ev->data.client_metadata_read.elements == NULL);
  GPR_ASSERT(on_finish_called == 0);
  grpc_event_finish(ev);
  GPR_ASSERT(on_finish_called == 1);

  shutdown_and_destroy(cc);
}

static void test_pluck() {
  grpc_event *ev;
  grpc_completion_queue *cc;
  void *tags[128];
  int i, j;
  int on_finish_called = 0;

  LOG_TEST();

  for (i = 0; i < GPR_ARRAY_SIZE(tags); i++) {
    tags[i] = create_test_tag();
    for (j = 0; j < i; j++) {
      GPR_ASSERT(tags[i] != tags[j]);
    }
  }

  cc = grpc_completion_queue_create();

  for (i = 0; i < GPR_ARRAY_SIZE(tags); i++) {
    grpc_cq_begin_op(cc, NULL, GRPC_WRITE_ACCEPTED);
    grpc_cq_end_write_accepted(cc, tags[i], NULL, increment_int_on_finish,
                               &on_finish_called, GRPC_OP_OK);
  }

  for (i = 0; i < GPR_ARRAY_SIZE(tags); i++) {
    ev = grpc_completion_queue_pluck(cc, tags[i], gpr_inf_past);
    GPR_ASSERT(ev->tag == tags[i]);
    grpc_event_finish(ev);
  }

  GPR_ASSERT(on_finish_called == GPR_ARRAY_SIZE(tags));

  for (i = 0; i < GPR_ARRAY_SIZE(tags); i++) {
    grpc_cq_begin_op(cc, NULL, GRPC_WRITE_ACCEPTED);
    grpc_cq_end_write_accepted(cc, tags[i], NULL, increment_int_on_finish,
                               &on_finish_called, GRPC_OP_OK);
  }

  for (i = 0; i < GPR_ARRAY_SIZE(tags); i++) {
    ev = grpc_completion_queue_pluck(cc, tags[GPR_ARRAY_SIZE(tags) - i - 1],
                                     gpr_inf_past);
    GPR_ASSERT(ev->tag == tags[GPR_ARRAY_SIZE(tags) - i - 1]);
    grpc_event_finish(ev);
  }

  GPR_ASSERT(on_finish_called == 2 * GPR_ARRAY_SIZE(tags));

  shutdown_and_destroy(cc);
}

#define TEST_THREAD_EVENTS 10000

typedef struct test_thread_options {
  gpr_event on_started;
  gpr_event *phase1;
  gpr_event on_phase1_done;
  gpr_event *phase2;
  gpr_event on_finished;
  int events_triggered;
  int id;
  grpc_completion_queue *cc;
} test_thread_options;

gpr_timespec ten_seconds_time() {
  return gpr_time_add(gpr_now(), gpr_time_from_micros(10 * 1000000));
}

static void producer_thread(void *arg) {
  test_thread_options *opt = arg;
  int i;

  gpr_log(GPR_INFO, "producer %d started", opt->id);
  gpr_event_set(&opt->on_started, (void *)(gpr_intptr)1);
  GPR_ASSERT(gpr_event_wait(opt->phase1, ten_seconds_time()));

  gpr_log(GPR_INFO, "producer %d phase 1", opt->id);
  for (i = 0; i < TEST_THREAD_EVENTS; i++) {
    grpc_cq_begin_op(opt->cc, NULL, GRPC_WRITE_ACCEPTED);
  }

  gpr_log(GPR_INFO, "producer %d phase 1 done", opt->id);
  gpr_event_set(&opt->on_phase1_done, (void *)(gpr_intptr)1);
  GPR_ASSERT(gpr_event_wait(opt->phase2, ten_seconds_time()));

  gpr_log(GPR_INFO, "producer %d phase 2", opt->id);
  for (i = 0; i < TEST_THREAD_EVENTS; i++) {
    grpc_cq_end_write_accepted(opt->cc, (void *)(gpr_intptr)1, NULL, NULL, NULL,
                               GRPC_OP_OK);
    opt->events_triggered++;
  }

  gpr_log(GPR_INFO, "producer %d phase 2 done", opt->id);
  gpr_event_set(&opt->on_finished, (void *)(gpr_intptr)1);
}

static void consumer_thread(void *arg) {
  test_thread_options *opt = arg;
  grpc_event *ev;

  gpr_log(GPR_INFO, "consumer %d started", opt->id);
  gpr_event_set(&opt->on_started, (void *)(gpr_intptr)1);
  GPR_ASSERT(gpr_event_wait(opt->phase1, ten_seconds_time()));

  gpr_log(GPR_INFO, "consumer %d phase 1", opt->id);

  gpr_log(GPR_INFO, "consumer %d phase 1 done", opt->id);
  gpr_event_set(&opt->on_phase1_done, (void *)(gpr_intptr)1);
  GPR_ASSERT(gpr_event_wait(opt->phase2, ten_seconds_time()));

  gpr_log(GPR_INFO, "consumer %d phase 2", opt->id);
  for (;;) {
    ev = grpc_completion_queue_next(opt->cc, ten_seconds_time());
    GPR_ASSERT(ev);
    switch (ev->type) {
      case GRPC_WRITE_ACCEPTED:
        GPR_ASSERT(ev->data.write_accepted == GRPC_OP_OK);
        opt->events_triggered++;
        grpc_event_finish(ev);
        break;
      case GRPC_QUEUE_SHUTDOWN:
        gpr_log(GPR_INFO, "consumer %d phase 2 done", opt->id);
        gpr_event_set(&opt->on_finished, (void *)(gpr_intptr)1);
        grpc_event_finish(ev);
        return;
      default:
        gpr_log(GPR_ERROR, "Invalid event received: %d", ev->type);
        abort();
    }
  }
}

static void test_threading(int producers, int consumers) {
  test_thread_options *options =
      gpr_malloc((producers + consumers) * sizeof(test_thread_options));
  gpr_event phase1 = GPR_EVENT_INIT;
  gpr_event phase2 = GPR_EVENT_INIT;
  grpc_completion_queue *cc = grpc_completion_queue_create();
  int i;
  int total_consumed = 0;
  static int optid = 101;

  gpr_log(GPR_INFO, "%s: %d producers, %d consumers", __FUNCTION__, producers,
          consumers);

  grpc_completion_queue_dont_poll_test_only(cc);

  /* start all threads: they will wait for phase1 */
  for (i = 0; i < producers + consumers; i++) {
    gpr_thd_id id;
    gpr_event_init(&options[i].on_started);
    gpr_event_init(&options[i].on_phase1_done);
    gpr_event_init(&options[i].on_finished);
    options[i].phase1 = &phase1;
    options[i].phase2 = &phase2;
    options[i].events_triggered = 0;
    options[i].cc = cc;
    options[i].id = optid++;
    GPR_ASSERT(gpr_thd_new(&id,
                           i < producers ? producer_thread : consumer_thread,
                           options + i, NULL));
    gpr_event_wait(&options[i].on_started, ten_seconds_time());
  }

  /* start phase1: producers will pre-declare all operations they will
     complete */
  gpr_log(GPR_INFO, "start phase 1");
  gpr_event_set(&phase1, (void *)(gpr_intptr)1);

  gpr_log(GPR_INFO, "wait phase 1");
  for (i = 0; i < producers + consumers; i++) {
    GPR_ASSERT(gpr_event_wait(&options[i].on_phase1_done, ten_seconds_time()));
  }
  gpr_log(GPR_INFO, "done phase 1");

  /* start phase2: operations will complete, and consumers will consume them */
  gpr_log(GPR_INFO, "start phase 2");
  gpr_event_set(&phase2, (void *)(gpr_intptr)1);

  /* in parallel, we shutdown the completion channel - all events should still
     be consumed */
  grpc_completion_queue_shutdown(cc);

  /* join all threads */
  gpr_log(GPR_INFO, "wait phase 2");
  for (i = 0; i < producers + consumers; i++) {
    GPR_ASSERT(gpr_event_wait(&options[i].on_finished, ten_seconds_time()));
  }
  gpr_log(GPR_INFO, "done phase 2");

  /* destroy the completion channel */
  grpc_completion_queue_destroy(cc);

  /* verify that everything was produced and consumed */
  for (i = 0; i < producers + consumers; i++) {
    if (i < producers) {
      GPR_ASSERT(options[i].events_triggered == TEST_THREAD_EVENTS);
    } else {
      total_consumed += options[i].events_triggered;
    }
  }
  GPR_ASSERT(total_consumed == producers * TEST_THREAD_EVENTS);

  gpr_free(options);
}

int main(int argc, char **argv) {
  grpc_test_init(argc, argv);
  grpc_iomgr_init();
  test_no_op();
  test_wait_empty();
  test_cq_end_read();
  test_cq_end_invoke_accepted();
  test_cq_end_write_accepted();
  test_cq_end_finish_accepted();
  test_cq_end_client_metadata_read();
  test_pluck();
  test_threading(1, 1);
  test_threading(1, 10);
  test_threading(10, 1);
  test_threading(10, 10);
  grpc_iomgr_shutdown();
  return 0;
}