# Copyright 2013 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.
import unittest

from measurements import page_cycler
from telemetry.core import browser_options
from telemetry.page import page_measurement_results
from telemetry.unittest import simple_mock

# Allow testing protected members in the unit test.
# pylint: disable=W0212

# Used instead of simple_mock.MockObject so that the precise order and
# number of calls need not be specified.
class MockMemoryMetric(object):
  def __init__(self):
    pass

  def Start(self, page, tab):
    pass

  def Stop(self, page, tab):
    pass

  def AddResults(self, tab, results):
    pass

  def AddSummaryResults(self, tab, results):
    pass

# Used to mock loading a page.
class FakePage(object):
  def __init__(self, url):
    self.url = url

# Used to mock a browser tab.
class FakeTab(object):
  def __init__(self):
    self.clear_cache_calls = 0
  def ClearCache(self):
    self.clear_cache_calls += 1
  def EvaluateJavaScript(self, _):
    return 1
  def WaitForJavaScriptExpression(self, _, __):
    pass

class PageCyclerUnitTest(unittest.TestCase):

  # TODO(tonyg): Remove this backfill when we can assume python 2.7 everywhere.
  def assertIn(self, first, second, _=None):
    self.assertTrue(first in second,
                    msg="'%s' not found in '%s'" % (first, second))

  def setupCycler(self, args, setup_memory_module=False):
    cycler = page_cycler.PageCycler()
    options = browser_options.BrowserFinderOptions()
    parser = options.CreateParser()
    cycler.AddCommandLineOptions(parser)
    parser.parse_args(args)
    cycler.CustomizeBrowserOptions(options)

    if setup_memory_module:
      # Mock out memory metrics; the real ones require a real browser.
      mock_memory_metric = MockMemoryMetric()

      mock_memory_module = simple_mock.MockObject()
      mock_memory_module.ExpectCall(
        'MemoryMetric').WithArgs(simple_mock.DONT_CARE).WillReturn(
        mock_memory_metric)

      real_memory_module = page_cycler.memory
      try:
        page_cycler.memory = mock_memory_module
        cycler.DidStartBrowser(None)
      finally:
        page_cycler.memory = real_memory_module

    return cycler

  def testOptionsColdLoadNoArgs(self):
    cycler = self.setupCycler([])

    self.assertEquals(cycler._cold_run_start_index, 10)

  def testOptionsColdLoadPagesetRepeat(self):
    cycler = self.setupCycler(['--pageset-repeat=20', '--page-repeat=2'])

    self.assertEquals(cycler._cold_run_start_index, 40)

  def testOptionsColdLoadRequested(self):
    cycler = self.setupCycler(['--pageset-repeat=21', '--page-repeat=2',
                               '--cold-load-percent=40'])

    self.assertEquals(cycler._cold_run_start_index, 26)

  def testIncompatibleOptions(self):
    exception_seen = False
    try:
      self.setupCycler(['--pageset-repeat=20s', '--page-repeat=2s',
                        '--cold-load-percent=40'])
    except Exception as e:
      exception_seen = True
      self.assertEqual('--cold-load-percent is incompatible with '
                       'timed repeat', e.args[0])

    self.assertTrue(exception_seen)

  def testCacheHandled(self):
    cycler = self.setupCycler(['--pageset-repeat=5',
                               '--cold-load-percent=50'],
                              True)

    url_name = "http://fakepage.com"
    page = FakePage(url_name)
    tab = FakeTab()
    results = page_measurement_results.PageMeasurementResults()

    for i in range(5):
      cycler.WillNavigateToPage(page, tab)
      self.assertEqual(max(0, i - 2), tab.clear_cache_calls,
                       "Iteration %d tab.clear_cache_calls %d" %
                       (i, tab.clear_cache_calls))
      results.WillMeasurePage(page)
      cycler.MeasurePage(page, tab, results)

      values = results.page_specific_values_for_current_page
      results.DidMeasurePage()

      self.assertEqual(1, len(values))
      self.assertEqual(values[0].page, page)

      chart_name = 'cold_times' if i == 0 or i > 2 else 'warm_times'
      self.assertEqual(values[0].name, '%s.page_load_time' % chart_name)
      self.assertEqual(values[0].units, 'ms')

      cycler.DidNavigateToPage(page, tab)

  def testColdWarm(self):
    cycler = self.setupCycler(['--pageset-repeat=3'], True)
    pages = [FakePage("http://fakepage1.com"), FakePage("http://fakepage2.com")]
    tab = FakeTab()
    results = page_measurement_results.PageMeasurementResults()
    for i in range(3):
      for page in pages:
        cycler.WillNavigateToPage(page, tab)
        results.WillMeasurePage(page)
        cycler.MeasurePage(page, tab, results)

        values = results.page_specific_values_for_current_page
        results.DidMeasurePage()

        self.assertEqual(1, len(values))
        self.assertEqual(values[0].page, page)

        chart_name = 'cold_times' if i == 0 else 'warm_times'
        self.assertEqual(values[0].name, '%s.page_load_time' % chart_name)

        cycler.DidNavigateToPage(page, tab)