/*
 *
 * 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 <grpc/support/log.h>

#include <stdbool.h>
#include <string.h>

#include "src/core/lib/gprpp/global_config.h"
#include "test/core/util/test_config.h"

// Config declaration is supposed to be located at log.h but
// log.h doesn't include global_config headers because it has to
// be a strict C so declaration statement gets to be here.
GPR_GLOBAL_CONFIG_DECLARE_STRING(grpc_verbosity);

static bool log_func_reached = false;

static void test_callback(gpr_log_func_args* args) {
  GPR_ASSERT(0 == strcmp(__FILE__, args->file));
  GPR_ASSERT(args->severity == GPR_LOG_SEVERITY_INFO);
  GPR_ASSERT(0 == strcmp(args->message, "hello 1 2 3"));
}

static void test_should_log(gpr_log_func_args* /*args*/) {
  log_func_reached = true;
}

static void test_should_not_log(gpr_log_func_args* /*args*/) {
  GPR_ASSERT(false);
}

#define test_log_function_reached(SEVERITY)     \
  gpr_set_log_function(test_should_log);        \
  log_func_reached = false;                     \
  gpr_log_message(SEVERITY, "hello 1 2 3");     \
  GPR_ASSERT(log_func_reached);                 \
  log_func_reached = false;                     \
  gpr_log(SEVERITY, "hello %d %d %d", 1, 2, 3); \
  GPR_ASSERT(log_func_reached);

#define test_log_function_unreached(SEVERITY) \
  gpr_set_log_function(test_should_not_log);  \
  gpr_log_message(SEVERITY, "hello 1 2 3");   \
  gpr_log(SEVERITY, "hello %d %d %d", 1, 2, 3);

int main(int argc, char** argv) {
  grpc::testing::TestEnvironment env(argc, argv);
  /* test logging at various verbosity levels */
  gpr_log(GPR_DEBUG, "%s", "hello world");
  gpr_log(GPR_INFO, "%s", "hello world");
  gpr_log(GPR_ERROR, "%s", "hello world");
  /* should succeed */
  GPR_ASSERT(1);
  gpr_set_log_function(test_callback);
  gpr_log_message(GPR_INFO, "hello 1 2 3");
  gpr_log(GPR_INFO, "hello %d %d %d", 1, 2, 3);
  gpr_set_log_function(nullptr);

  /* gpr_log_verbosity_init() will be effective only once, and only before
   * gpr_set_log_verbosity() is called */
  GPR_GLOBAL_CONFIG_SET(grpc_verbosity, "ERROR");
  gpr_log_verbosity_init();

  test_log_function_reached(GPR_ERROR);
  test_log_function_unreached(GPR_INFO);
  test_log_function_unreached(GPR_DEBUG);

  /* gpr_log_verbosity_init() should not be effective */
  GPR_GLOBAL_CONFIG_SET(grpc_verbosity, "DEBUG");
  gpr_log_verbosity_init();
  test_log_function_reached(GPR_ERROR);
  test_log_function_unreached(GPR_INFO);
  test_log_function_unreached(GPR_DEBUG);

  gpr_set_log_verbosity(GPR_LOG_SEVERITY_DEBUG);
  test_log_function_reached(GPR_ERROR);
  test_log_function_reached(GPR_INFO);
  test_log_function_reached(GPR_DEBUG);

  gpr_set_log_verbosity(GPR_LOG_SEVERITY_INFO);
  test_log_function_reached(GPR_ERROR);
  test_log_function_reached(GPR_INFO);
  test_log_function_unreached(GPR_DEBUG);

  gpr_set_log_verbosity(GPR_LOG_SEVERITY_ERROR);
  test_log_function_reached(GPR_ERROR);
  test_log_function_unreached(GPR_INFO);
  test_log_function_unreached(GPR_DEBUG);

  /* gpr_log_verbosity_init() should not be effective */
  GPR_GLOBAL_CONFIG_SET(grpc_verbosity, "DEBUG");
  gpr_log_verbosity_init();
  test_log_function_reached(GPR_ERROR);
  test_log_function_unreached(GPR_INFO);
  test_log_function_unreached(GPR_DEBUG);

  /* TODO(ctiller): should we add a GPR_ASSERT failure test here */
  return 0;
}
