/*
 *
 * 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 "src/core/lib/iomgr/port.h"

// This test only works with the generic timer implementation
#ifdef GRPC_TIMER_USE_GENERIC

#include "src/core/lib/iomgr/timer.h"

#include <string.h>

#include <grpc/support/log.h>
#include "src/core/lib/debug/trace.h"
#include "test/core/util/test_config.h"
#include "test/core/util/tracer_util.h"

#define MAX_CB 30

extern grpc_core::TraceFlag grpc_timer_trace;
extern grpc_core::TraceFlag grpc_timer_check_trace;

static int cb_called[MAX_CB][2];

static void cb(grpc_exec_ctx* exec_ctx, void* arg, grpc_error* error) {
  cb_called[(intptr_t)arg][error == GRPC_ERROR_NONE]++;
}

static void add_test(void) {
  int i;
  grpc_timer timers[20];
  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;

  gpr_log(GPR_INFO, "add_test");

  grpc_timer_list_init(&exec_ctx);
  grpc_core::testing::grpc_tracer_enable_flag(&grpc_timer_trace);
  grpc_core::testing::grpc_tracer_enable_flag(&grpc_timer_check_trace);
  memset(cb_called, 0, sizeof(cb_called));

  grpc_millis start = grpc_exec_ctx_now(&exec_ctx);

  /* 10 ms timers.  will expire in the current epoch */
  for (i = 0; i < 10; i++) {
    grpc_timer_init(
        &exec_ctx, &timers[i], start + 10,
        GRPC_CLOSURE_CREATE(cb, (void*)(intptr_t)i, grpc_schedule_on_exec_ctx));
  }

  /* 1010 ms timers.  will expire in the next epoch */
  for (i = 10; i < 20; i++) {
    grpc_timer_init(
        &exec_ctx, &timers[i], start + 1010,
        GRPC_CLOSURE_CREATE(cb, (void*)(intptr_t)i, grpc_schedule_on_exec_ctx));
  }

  /* collect timers.  Only the first batch should be ready. */
  exec_ctx.now = start + 500;
  GPR_ASSERT(grpc_timer_check(&exec_ctx, nullptr) == GRPC_TIMERS_FIRED);
  grpc_exec_ctx_finish(&exec_ctx);
  for (i = 0; i < 20; i++) {
    GPR_ASSERT(cb_called[i][1] == (i < 10));
    GPR_ASSERT(cb_called[i][0] == 0);
  }

  exec_ctx.now = start + 600;
  GPR_ASSERT(grpc_timer_check(&exec_ctx, nullptr) ==
             GRPC_TIMERS_CHECKED_AND_EMPTY);
  grpc_exec_ctx_finish(&exec_ctx);
  for (i = 0; i < 30; i++) {
    GPR_ASSERT(cb_called[i][1] == (i < 10));
    GPR_ASSERT(cb_called[i][0] == 0);
  }

  /* collect the rest of the timers */
  exec_ctx.now = start + 1500;
  GPR_ASSERT(grpc_timer_check(&exec_ctx, nullptr) == GRPC_TIMERS_FIRED);
  grpc_exec_ctx_finish(&exec_ctx);
  for (i = 0; i < 30; i++) {
    GPR_ASSERT(cb_called[i][1] == (i < 20));
    GPR_ASSERT(cb_called[i][0] == 0);
  }

  exec_ctx.now = start + 1600;
  GPR_ASSERT(grpc_timer_check(&exec_ctx, nullptr) ==
             GRPC_TIMERS_CHECKED_AND_EMPTY);
  for (i = 0; i < 30; i++) {
    GPR_ASSERT(cb_called[i][1] == (i < 20));
    GPR_ASSERT(cb_called[i][0] == 0);
  }

  grpc_timer_list_shutdown(&exec_ctx);
  grpc_exec_ctx_finish(&exec_ctx);
}

/* Cleaning up a list with pending timers. */
void destruction_test(void) {
  grpc_timer timers[5];
  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;

  gpr_log(GPR_INFO, "destruction_test");

  exec_ctx.now_is_valid = true;
  exec_ctx.now = 0;
  grpc_timer_list_init(&exec_ctx);
  grpc_core::testing::grpc_tracer_enable_flag(&grpc_timer_trace);
  grpc_core::testing::grpc_tracer_enable_flag(&grpc_timer_check_trace);
  memset(cb_called, 0, sizeof(cb_called));

  grpc_timer_init(
      &exec_ctx, &timers[0], 100,
      GRPC_CLOSURE_CREATE(cb, (void*)(intptr_t)0, grpc_schedule_on_exec_ctx));
  grpc_timer_init(
      &exec_ctx, &timers[1], 3,
      GRPC_CLOSURE_CREATE(cb, (void*)(intptr_t)1, grpc_schedule_on_exec_ctx));
  grpc_timer_init(
      &exec_ctx, &timers[2], 100,
      GRPC_CLOSURE_CREATE(cb, (void*)(intptr_t)2, grpc_schedule_on_exec_ctx));
  grpc_timer_init(
      &exec_ctx, &timers[3], 3,
      GRPC_CLOSURE_CREATE(cb, (void*)(intptr_t)3, grpc_schedule_on_exec_ctx));
  grpc_timer_init(
      &exec_ctx, &timers[4], 1,
      GRPC_CLOSURE_CREATE(cb, (void*)(intptr_t)4, grpc_schedule_on_exec_ctx));
  exec_ctx.now = 2;
  GPR_ASSERT(grpc_timer_check(&exec_ctx, nullptr) == GRPC_TIMERS_FIRED);
  grpc_exec_ctx_finish(&exec_ctx);
  GPR_ASSERT(1 == cb_called[4][1]);
  grpc_timer_cancel(&exec_ctx, &timers[0]);
  grpc_timer_cancel(&exec_ctx, &timers[3]);
  grpc_exec_ctx_finish(&exec_ctx);
  GPR_ASSERT(1 == cb_called[0][0]);
  GPR_ASSERT(1 == cb_called[3][0]);

  grpc_timer_list_shutdown(&exec_ctx);
  grpc_exec_ctx_finish(&exec_ctx);
  GPR_ASSERT(1 == cb_called[1][0]);
  GPR_ASSERT(1 == cb_called[2][0]);
}

int main(int argc, char** argv) {
  grpc_test_init(argc, argv);
  gpr_set_log_verbosity(GPR_LOG_SEVERITY_DEBUG);
  add_test();
  destruction_test();
  return 0;
}

#else /* GRPC_TIMER_USE_GENERIC */

int main(int argc, char** argv) { return 1; }

#endif /* GRPC_TIMER_USE_GENERIC */