// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0

#include <gtest/gtest.h>
#include <string>
#include <utility>

#include "opentelemetry/common/macros.h"
#include "opentelemetry/nostd/function_ref.h"
#include "opentelemetry/nostd/string_view.h"
#include "opentelemetry/nostd/unique_ptr.h"
#include "opentelemetry/sdk/instrumentationscope/instrumentation_scope.h"
#include "opentelemetry/sdk/metrics/instruments.h"
#include "opentelemetry/sdk/metrics/view/instrument_selector.h"
#include "opentelemetry/sdk/metrics/view/meter_selector.h"
#include "opentelemetry/sdk/metrics/view/view.h"
#include "opentelemetry/sdk/metrics/view/view_registry.h"

using namespace opentelemetry::sdk::metrics;
using namespace opentelemetry::sdk::instrumentationscope;

TEST(ViewRegistry, FindViewsEmptyRegistry)
{
  InstrumentDescriptor default_instrument_descriptor = {
      "test_name",               // name
      "test_descr",              // description
      "1",                       // unit
      InstrumentType::kCounter,  // instrument type
      InstrumentValueType::kLong};

  auto default_instrumentation_scope =
      InstrumentationScope::Create("default", "1.0.0", "https://opentelemetry.io/schemas/1.7.0");
  int count = 0;
  ViewRegistry registry;
  auto status =
      registry.FindViews(default_instrument_descriptor, *default_instrumentation_scope.get(),
                         [&count](const View &view) {
                           count++;
#if OPENTELEMETRY_HAVE_WORKING_REGEX
                           EXPECT_EQ(view.GetName(), "");
                           EXPECT_EQ(view.GetDescription(), "");
#endif
                           EXPECT_EQ(view.GetAggregationType(), AggregationType::kDefault);
                           return true;
                         });
#if OPENTELEMETRY_HAVE_WORKING_REGEX
  EXPECT_EQ(count, 1);
  EXPECT_EQ(status, true);
#endif
}

TEST(ViewRegistry, FindNonExistingView)
{
  // Add view
  const std::string view_name               = "test_view";
  const std::string view_description        = "test description";
  const std::string instrumentation_name    = "name1";
  const std::string instrumentation_version = "version1";
  const std::string instrumentation_schema  = "schema1";
  const std::string instrument_name         = "testname";
  const InstrumentType instrument_type      = InstrumentType::kCounter;
  const std::string instrument_unit         = "ms";

  std::unique_ptr<InstrumentSelector> instrument_selector{
      new InstrumentSelector(instrument_type, instrument_name, instrument_unit)};
  std::unique_ptr<MeterSelector> meter_selector{
      new MeterSelector(instrumentation_name, instrumentation_version, instrumentation_schema)};
  std::unique_ptr<View> view = std::unique_ptr<View>(new View(view_name, view_description));

  ViewRegistry registry;
  registry.AddView(std::move(instrument_selector), std::move(meter_selector), std::move(view));
  InstrumentDescriptor default_instrument_descriptor = {instrument_name,  // name
                                                        "test_descr",     // description
                                                        instrument_unit,  // unit
                                                        instrument_type,  // instrument type
                                                        InstrumentValueType::kLong};

  auto default_instrumentation_scope = InstrumentationScope::Create(
      instrumentation_name, instrumentation_version, instrumentation_schema);
  int count = 0;
  auto status =
      registry.FindViews(default_instrument_descriptor, *default_instrumentation_scope.get(),
                         [&count, &view_name, &view_description](const View &view) {
                           count++;
#if OPENTELEMETRY_HAVE_WORKING_REGEX
                           EXPECT_EQ(view.GetName(), view_name);
                           EXPECT_EQ(view.GetDescription(), view_description);
#endif
                           return true;
                         });
#if OPENTELEMETRY_HAVE_WORKING_REGEX
  EXPECT_EQ(count, 1);
  EXPECT_EQ(status, true);
#endif
}