# Copyright 2015 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Dummy benchmarks for the bisect FYI integration tests.

The number they produce aren't meant to represent any actual performance
data of the browser. For more information about these dummy benchmarks,
see: https://goo.gl/WvZiiW
"""

import random

from core import perf_benchmark

from telemetry.value import scalar
from telemetry.page import page_test

from page_sets import dummy_story_set


class _DummyTest(page_test.PageTest):

  def __init__(self, avg, std):
    super(_DummyTest, self).__init__()
    self._avg = avg
    self._std = std

  def ValidateAndMeasurePage(self, page, tab, results):
    results.AddValue(scalar.ScalarValue(
        page=page,
        name='gaussian-value', units='ms',
        value=random.gauss(self._avg, self._std),
        description=('Random number that follows the Gaussian distribution '
                     'with mean=%s and std=%s' % (self._avg, self._std))))


class _DummyBenchmark(perf_benchmark.PerfBenchmark):
  page_set = dummy_story_set.DummyStorySet


class DummyBenchmarkOne(_DummyBenchmark):
  """A low noise benchmark with mean=100 & std=1."""

  def CreatePageTest(self, options):
    return _DummyTest(120, 1)

  @classmethod
  def Name(cls):
    return 'dummy_benchmark.stable_benchmark_1'


class DummyBenchmarkTwo(_DummyBenchmark):
  """A noisy benchmark with mean=50 & std=20."""

  def CreatePageTest(self, options):
    return _DummyTest(50, 20)

  @classmethod
  def Name(cls):
    return 'dummy_benchmark.noisy_benchmark_1'