/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * 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.android.settings.fuelgauge;

import android.content.Context;
import android.content.Intent;
import android.os.Process;
import android.text.TextUtils;
import android.text.format.DateUtils;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;
import com.android.internal.os.BatterySipper;
import com.android.internal.os.BatteryStatsImpl;
import com.android.settings.R;
import com.android.settings.TestConfig;
import com.android.settings.applications.LayoutPreference;
import com.android.settings.testutils.FakeFeatureFactory;
import com.android.settingslib.BatteryInfo;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Answers;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;
import org.robolectric.RobolectricTestRunner;
import org.robolectric.annotation.Config;
import org.robolectric.util.ReflectionHelpers;

import java.util.ArrayList;
import java.util.List;

import static com.android.settings.fuelgauge.PowerUsageBase.MENU_STATS_REFRESH;
import static com.android.settings.fuelgauge.PowerUsageSummary.MENU_ADDITIONAL_BATTERY_INFO;
import static com.android.settings.fuelgauge.PowerUsageSummary.MENU_TOGGLE_APPS;
import static com.google.common.truth.Truth.assertThat;
import static org.mockito.Matchers.anyString;
import static org.mockito.Mockito.never;
import static org.mockito.Mockito.spy;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

/**
 * Unit tests for {@link PowerUsageSummary}.
 */
// TODO: Improve this test class so that it starts up the real activity and fragment.
@RunWith(RobolectricTestRunner.class)
@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
public class PowerUsageSummaryTest {
    private static final String[] PACKAGE_NAMES = {"com.app1", "com.app2"};
    private static final String TIME_LEFT = "2h30min";
    private static final int UID = 123;
    private static final int POWER_MAH = 100;
    private static final long REMAINING_TIME_US = 100000;
    private static final double BATTERY_SCREEN_USAGE = 300;
    private static final double BATTERY_SYSTEM_USAGE = 600;
    private static final double PRECISION = 0.001;
    private static final Intent ADDITIONAL_BATTERY_INFO_INTENT =
            new Intent("com.example.app.ADDITIONAL_BATTERY_INFO");

    @Mock(answer = Answers.RETURNS_DEEP_STUBS)
    private Context mContext;
    @Mock(answer = Answers.RETURNS_DEEP_STUBS)
    private Menu mMenu;
    @Mock
    private MenuItem mRefreshMenu;
    @Mock
    private MenuItem mAdditionalBatteryInfoMenu;
    @Mock
    private MenuItem mToggleAppsMenu;
    @Mock
    private MenuInflater mMenuInflater;
    @Mock
    private BatterySipper mNormalBatterySipper;
    @Mock
    private BatterySipper mScreenBatterySipper;
    @Mock
    private BatterySipper mSystemBatterySipper;
    @Mock
    private PowerGaugePreference mPreference;
    @Mock
    private LayoutPreference mBatteryLayoutPref;
    @Mock
    private BatteryMeterView mBatteryMeterView;
    @Mock
    private TextView mTimeText;
    @Mock
    private TextView mSummary1;
    @Mock
    private TextView mSummary2;
    @Mock
    private BatteryInfo mBatteryInfo;

    private TestFragment mFragment;
    private FakeFeatureFactory mFeatureFactory;
    private PowerUsageSummary mPowerUsageSummary;

    @Before
    public void setUp() {
        MockitoAnnotations.initMocks(this);

        FakeFeatureFactory.setupForTest(mContext);
        mFeatureFactory = (FakeFeatureFactory) FakeFeatureFactory.getFactory(mContext);

        mFragment = new TestFragment(mContext);

        when(mMenu.add(Menu.NONE, MENU_STATS_REFRESH, Menu.NONE,
                R.string.menu_stats_refresh)
                .setIcon(com.android.internal.R.drawable.ic_menu_refresh)
                .setAlphabeticShortcut('r'))
                .thenReturn(mRefreshMenu);
        when(mAdditionalBatteryInfoMenu.getItemId())
                .thenReturn(MENU_ADDITIONAL_BATTERY_INFO);
        when(mToggleAppsMenu.getItemId()).thenReturn(MENU_TOGGLE_APPS);
        when(mFeatureFactory.powerUsageFeatureProvider.getAdditionalBatteryInfoIntent())
                .thenReturn(ADDITIONAL_BATTERY_INFO_INTENT);

        mPowerUsageSummary = spy(new PowerUsageSummary());

        when(mPowerUsageSummary.getContext()).thenReturn(mContext);
        when(mNormalBatterySipper.getPackages()).thenReturn(PACKAGE_NAMES);
        when(mNormalBatterySipper.getUid()).thenReturn(UID);
        mNormalBatterySipper.totalPowerMah = POWER_MAH;
        when(mBatteryLayoutPref.findViewById(R.id.summary1)).thenReturn(mSummary1);
        when(mBatteryLayoutPref.findViewById(R.id.summary2)).thenReturn(mSummary2);
        when(mBatteryLayoutPref.findViewById(R.id.time)).thenReturn(mTimeText);
        when(mBatteryLayoutPref.findViewById(R.id.battery_header_icon))
                .thenReturn(mBatteryMeterView);
        mPowerUsageSummary.setBatteryLayoutPreference(mBatteryLayoutPref);

        mScreenBatterySipper.drainType = BatterySipper.DrainType.SCREEN;
        mScreenBatterySipper.totalPowerMah = BATTERY_SCREEN_USAGE;
        mSystemBatterySipper.drainType = BatterySipper.DrainType.APP;
        mSystemBatterySipper.totalPowerMah = BATTERY_SYSTEM_USAGE;
        when(mSystemBatterySipper.getUid()).thenReturn(Process.SYSTEM_UID);
    }

    @Test
    public void testOptionsMenu_additionalBatteryInfoEnabled() {
        when(mFeatureFactory.powerUsageFeatureProvider.isAdditionalBatteryInfoEnabled())
                .thenReturn(true);

        mFragment.onCreateOptionsMenu(mMenu, mMenuInflater);

        verify(mMenu).add(Menu.NONE, MENU_ADDITIONAL_BATTERY_INFO,
                Menu.NONE, R.string.additional_battery_info);

        mFragment.onOptionsItemSelected(mAdditionalBatteryInfoMenu);

        assertThat(mFragment.mStartActivityCalled).isTrue();
        assertThat(mFragment.mStartActivityIntent).isEqualTo(ADDITIONAL_BATTERY_INFO_INTENT);
    }

    @Test
    public void testOptionsMenu_additionalBatteryInfoDisabled() {
        when(mFeatureFactory.powerUsageFeatureProvider.isAdditionalBatteryInfoEnabled())
                .thenReturn(false);

        mFragment.onCreateOptionsMenu(mMenu, mMenuInflater);

        verify(mMenu, never()).add(Menu.NONE, MENU_ADDITIONAL_BATTERY_INFO,
                Menu.NONE, R.string.additional_battery_info);
    }

    @Test
    public void testOptionsMenu_ToggleAppsEnabled() {
        when(mFeatureFactory.powerUsageFeatureProvider.isPowerAccountingToggleEnabled())
                .thenReturn(true);
        mFragment.mShowAllApps = false;

        mFragment.onCreateOptionsMenu(mMenu, mMenuInflater);

        verify(mMenu).add(Menu.NONE, MENU_TOGGLE_APPS, Menu.NONE, R.string.show_all_apps);
    }

    @Test
    public void testOptionsMenu_ClickToggleAppsMenu_DataChanged() {
        testToggleAllApps(true);
        testToggleAllApps(false);
    }

    @Test
    public void testExtractKeyFromSipper_TypeAPPUidObjectNull_ReturnPackageNames() {
        mNormalBatterySipper.uidObj = null;
        mNormalBatterySipper.drainType = BatterySipper.DrainType.APP;

        final String key = mPowerUsageSummary.extractKeyFromSipper(mNormalBatterySipper);
        assertThat(key).isEqualTo(TextUtils.concat(mNormalBatterySipper.getPackages()).toString());
    }

    @Test
    public void testExtractKeyFromSipper_TypeOther_ReturnDrainType() {
        mNormalBatterySipper.uidObj = null;
        mNormalBatterySipper.drainType = BatterySipper.DrainType.BLUETOOTH;

        final String key = mPowerUsageSummary.extractKeyFromSipper(mNormalBatterySipper);
        assertThat(key).isEqualTo(mNormalBatterySipper.drainType.toString());
    }

    @Test
    public void testExtractKeyFromSipper_TypeAPPUidObjectNotNull_ReturnUid() {
        mNormalBatterySipper.uidObj = new BatteryStatsImpl.Uid(new BatteryStatsImpl(), UID);
        mNormalBatterySipper.drainType = BatterySipper.DrainType.APP;

        final String key = mPowerUsageSummary.extractKeyFromSipper(mNormalBatterySipper);
        assertThat(key).isEqualTo(Integer.toString(mNormalBatterySipper.getUid()));
    }

    @Test
    public void testRemoveHiddenBatterySippers_ContainsHiddenSippers_RemoveAndReturnValue() {
        final List<BatterySipper> sippers = new ArrayList<>();
        sippers.add(mNormalBatterySipper);
        sippers.add(mScreenBatterySipper);
        sippers.add(mSystemBatterySipper);

        final double totalUsage = mPowerUsageSummary.removeHiddenBatterySippers(sippers);
        assertThat(sippers).containsExactly(mNormalBatterySipper);
        assertThat(totalUsage).isWithin(PRECISION).of(BATTERY_SCREEN_USAGE + BATTERY_SYSTEM_USAGE);
    }

    @Test
    public void testShouldHideSipper_TypeIdle_ReturnTrue() {
        mNormalBatterySipper.drainType = BatterySipper.DrainType.IDLE;
        assertThat(mPowerUsageSummary.shouldHideSipper(mNormalBatterySipper)).isTrue();
    }

    @Test
    public void testShouldHideSipper_TypeCell_ReturnTrue() {
        mNormalBatterySipper.drainType = BatterySipper.DrainType.CELL;
        assertThat(mPowerUsageSummary.shouldHideSipper(mNormalBatterySipper)).isTrue();
    }

    @Test
    public void testShouldHideSipper_TypeScreen_ReturnTrue() {
        mNormalBatterySipper.drainType = BatterySipper.DrainType.SCREEN;
        assertThat(mPowerUsageSummary.shouldHideSipper(mNormalBatterySipper)).isTrue();
    }

    @Test
    public void testShouldHideSipper_UidRoot_ReturnTrue() {
        mNormalBatterySipper.drainType = BatterySipper.DrainType.APP;
        when(mNormalBatterySipper.getUid()).thenReturn(Process.ROOT_UID);
        assertThat(mPowerUsageSummary.shouldHideSipper(mNormalBatterySipper)).isTrue();
    }

    @Test
    public void testShouldHideSipper_UidSystem_ReturnTrue() {
        mNormalBatterySipper.drainType = BatterySipper.DrainType.APP;
        when(mNormalBatterySipper.getUid()).thenReturn(Process.SYSTEM_UID);
        assertThat(mPowerUsageSummary.shouldHideSipper(mNormalBatterySipper)).isTrue();
    }

    @Test
    public void testShouldHideSipper_UidNormal_ReturnFalse() {
        mNormalBatterySipper.drainType = BatterySipper.DrainType.APP;
        when(mNormalBatterySipper.getUid()).thenReturn(UID);
        assertThat(mPowerUsageSummary.shouldHideSipper(mNormalBatterySipper)).isFalse();
    }

    @Test
    public void testSetUsageSummary_TimeLessThanOneMinute_DoNotSetSummary() {
        final long usageTimeMs = 59 * DateUtils.SECOND_IN_MILLIS;

        mPowerUsageSummary.setUsageSummary(mPreference, "", usageTimeMs);
        verify(mPreference, never()).setSummary(anyString());
    }

    @Test
    public void testSetUsageSummary_TimeMoreThanOneMinute_SetSummary() {
        final long usageTimeMs = 2 * DateUtils.MINUTE_IN_MILLIS;

        mPowerUsageSummary.setUsageSummary(mPreference, "", usageTimeMs);
        verify(mPreference).setSummary(anyString());
    }

    @Test
    public void testUpdatePreference_NoEstimatedTime_DoNotShowSummary() {
        mBatteryInfo.remainingTimeUs = 0;
        mBatteryInfo.remainingLabel = TIME_LEFT;
        mPowerUsageSummary.updateHeaderPreference(mBatteryInfo);

        verify(mSummary1).setVisibility(View.INVISIBLE);
        verify(mSummary2).setVisibility(View.INVISIBLE);
    }

    @Test
    public void testUpdatePreference_HasEstimatedTime_ShowSummary() {
        mBatteryInfo.remainingTimeUs = REMAINING_TIME_US;
        mBatteryInfo.remainingLabel = TIME_LEFT;
        mPowerUsageSummary.updateHeaderPreference(mBatteryInfo);

        verify(mSummary1).setVisibility(View.VISIBLE);
        verify(mSummary2).setVisibility(View.VISIBLE);
    }

    @Test
    public void testUpdatePreference_Charging_ShowChargingTimeLeft() {
        mBatteryInfo.remainingTimeUs = REMAINING_TIME_US;
        mBatteryInfo.mDischarging = false;

        mPowerUsageSummary.updateHeaderPreference(mBatteryInfo);
        verify(mSummary1).setText(R.string.estimated_charging_time_left);
    }

    @Test
    public void testUpdatePreference_NotCharging_ShowTimeLeft() {
        mBatteryInfo.remainingTimeUs = REMAINING_TIME_US;
        mBatteryInfo.mDischarging = true;

        mPowerUsageSummary.updateHeaderPreference(mBatteryInfo);
        verify(mSummary1).setText(R.string.estimated_time_left);
    }

    private void testToggleAllApps(final boolean isShowApps) {
        mFragment.mShowAllApps = isShowApps;

        mFragment.onOptionsItemSelected(mToggleAppsMenu);
        assertThat(mFragment.mShowAllApps).isEqualTo(!isShowApps);
    }

    public static class TestFragment extends PowerUsageSummary {

        private Context mContext;
        private boolean mStartActivityCalled;
        private Intent mStartActivityIntent;

        public TestFragment(Context context) {
            mContext = context;
        }

        @Override
        public Context getContext() {
            return mContext;
        }

        @Override
        public void startActivity(Intent intent) {
            mStartActivityCalled = true;
            mStartActivityIntent = intent;
        }

        @Override
        protected void refreshStats() {
            // Leave it empty for toggle apps menu test
        }
    }
}