// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

#include "platform/assert.h"

#include "vm/dart_api_impl.h"
#include "vm/dart_api_state.h"
#include "vm/globals.h"
#include "vm/json_stream.h"
#include "vm/metrics.h"
#include "vm/unit_test.h"

namespace dart {

UNIT_TEST_CASE(Metric_Simple) {
  Isolate* isolate = Isolate::Init(NULL);
  EXPECT_EQ(isolate, Isolate::Current());
  Metric metric;

  // Initialize metric.
  metric.Init(Isolate::Current(), "a.b.c", "foobar", Metric::kCounter);
  EXPECT_EQ(0, metric.value());
  metric.increment();
  EXPECT_EQ(1, metric.value());
  metric.set_value(44);
  EXPECT_EQ(44, metric.value());
}

class MyMetric : public Metric {
 protected:
  int64_t Value() const {
    // 99 bytes.
    return 99;
  }

 public:
  // Just used for testing.
  int64_t LeakyValue() const { return Value(); }
};

UNIT_TEST_CASE(Metric_OnDemand) {
  Isolate* isolate = Isolate::Init(NULL);
  EXPECT_EQ(isolate, Isolate::Current());
  MyMetric metric;

  metric.Init(Isolate::Current(), "a.b.c", "foobar", Metric::kByte);
  // value is still the default value.
  EXPECT_EQ(0, metric.value());
  // Call LeakyValue to confirm that Value returns constant 99.
  EXPECT_EQ(99, metric.LeakyValue());

  // Serialize to JSON.
  JSONStream js;
  metric.PrintJSON(&js);
  const char* json = js.ToCString();
  EXPECT_STREQ("{\"type\":\"Counter\",\"name\":\"a.b.c\",\"description\":"
               "\"foobar\",\"unit\":\"byte\",\"id\":\"metrics\\/vm\\/a.b.c\""
               ",\"value\":99.000000}", json);
}

}  // namespace dart