/*
 * Copyright 2012 Google Inc.
 *
 * 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.
 */

package com.google.android.apps.mytracks.maps;

import com.google.android.apps.mytracks.util.PreferencesUtils;
import com.google.android.maps.mytracks.R;

import android.content.Context;
import android.test.AndroidTestCase;

/**
 * Tests for the {@link DynamicSpeedTrackPathDescriptor}.
 * 
 * @author Youtao Liu
 */
public class DynamicSpeedTrackPathDescriptorTest extends AndroidTestCase {

  private Context context;

  @Override
  protected void setUp() throws Exception {
    super.setUp();
    context = getContext();
  }

  /**
   * Tests the method {@link DynamicSpeedTrackPathDescriptor#getSpeedMargin()}
   * with zero, normal and illegal value.
   */
  public void testGetSpeedMargin() {
    // The default value of speedMargin is 25.
    int[] expectations = { 0, 50, 99, 25 };
    // Test
    for (int i = 0; i < expectations.length; i++) {
      PreferencesUtils.setInt(context, R.string.track_color_mode_percentage_key, expectations[i]);
      DynamicSpeedTrackPathDescriptor dynamicSpeedTrackPathDescriptor = new DynamicSpeedTrackPathDescriptor(
          context);
      assertEquals(expectations[i], dynamicSpeedTrackPathDescriptor.getSpeedMargin());
    }
  }

  /**
   * Tests {@link DynamicSpeedTrackPathDescriptor#getSlowSpeed()}.
   */
  public void testGetSlowSpeed() {
    DynamicSpeedTrackPathDescriptor dynamicSpeedTrackPathDescriptor = new DynamicSpeedTrackPathDescriptor(
        context);
    dynamicSpeedTrackPathDescriptor.setAverageMovingSpeed(50);
    dynamicSpeedTrackPathDescriptor.setSpeedMargin(10);
    assertEquals(50.0, dynamicSpeedTrackPathDescriptor.getAverageMovingSpeed());
    assertEquals(45.0, dynamicSpeedTrackPathDescriptor.getSlowSpeed());
  }

  /**
   * Tests {@link DynamicSpeedTrackPathDescriptor#getNormalSpeed()}.
   */
  public void testGetNormalSpeed() {
    DynamicSpeedTrackPathDescriptor dynamicSpeedTrackPathDescriptor = new DynamicSpeedTrackPathDescriptor(
        context);
    dynamicSpeedTrackPathDescriptor.setAverageMovingSpeed(50);
    dynamicSpeedTrackPathDescriptor.setSpeedMargin(10);
    assertEquals(50.0, dynamicSpeedTrackPathDescriptor.getAverageMovingSpeed());
    assertEquals(55.0, dynamicSpeedTrackPathDescriptor.getNormalSpeed());
  }

  /**
   * Tests {@link DynamicSpeedTrackPathDescriptor#updateState(com.google.android.apps.mytracks.stats.TripStatistics)}
   * by different averageMovingSpeed.
   */
  public void testIsDiffereceSignificant() {
    DynamicSpeedTrackPathDescriptor dynamicSpeedTrackPathDescriptor = new DynamicSpeedTrackPathDescriptor(
        context);
    double[] averageMovingSpeeds = { 0, 30, 30, 30 };
    double[] newAverageMovingSpeed = { 20, 30,
        // Difference is less than CRITICAL_DIFFERENCE_PERCENTAGE
        30 * (1 + (DynamicSpeedTrackPathDescriptor.CRITICAL_DIFFERENCE_PERCENTAGE / 100) / 2),
        // Difference is more than CRITICAL_DIFFERENCE_PERCENTAGE
        30 * (1 + (DynamicSpeedTrackPathDescriptor.CRITICAL_DIFFERENCE_PERCENTAGE / 100.00) * 2) };
    boolean[] expectedValues = { true, false, false, true };
    double[] expectedAverageMovingSpeed = { 0, 30, 30, 30 };
    // Test
    for (int i = 0; i < newAverageMovingSpeed.length; i++) {
      dynamicSpeedTrackPathDescriptor.setAverageMovingSpeed(averageMovingSpeeds[i]);
      assertEquals(expectedValues[i], dynamicSpeedTrackPathDescriptor.isDifferenceSignificant(
          averageMovingSpeeds[i], newAverageMovingSpeed[i]));
      assertEquals(expectedAverageMovingSpeed[i],
          dynamicSpeedTrackPathDescriptor.getAverageMovingSpeed());
    }
  }
}