/*
 * Copyright (C) 2021 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.car.settings.datausage;

import static android.app.usage.NetworkStats.Bucket.UID_TETHERING;

import static com.google.common.truth.Truth.assertThat;

import static org.mockito.ArgumentMatchers.anyBoolean;
import static org.mockito.ArgumentMatchers.anyInt;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

import android.app.usage.NetworkStats;
import android.car.drivingstate.CarUxRestrictions;
import android.content.Context;

import androidx.annotation.NonNull;
import androidx.lifecycle.LifecycleOwner;
import androidx.preference.PreferenceManager;
import androidx.preference.PreferenceScreen;
import androidx.test.annotation.UiThreadTest;
import androidx.test.core.app.ApplicationProvider;
import androidx.test.ext.junit.runners.AndroidJUnit4;

import com.android.car.settings.common.FragmentController;
import com.android.car.settings.common.LogicalPreferenceGroup;
import com.android.car.settings.common.PreferenceControllerTestUtil;
import com.android.car.settings.common.ProgressBarPreference;
import com.android.car.settings.testutils.TestLifecycleOwner;
import com.android.settingslib.net.UidDetail;
import com.android.settingslib.net.UidDetailProvider;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;

import java.util.Queue;
import java.util.concurrent.LinkedBlockingQueue;

@RunWith(AndroidJUnit4.class)
public class AppDataUsagePreferenceControllerTest {

    private Context mContext = ApplicationProvider.getApplicationContext();
    private LifecycleOwner mLifecycleOwner;
    private CarUxRestrictions mCarUxRestrictions;
    private TestAppDataUsagePreferenceController mPreferenceController;
    private LogicalPreferenceGroup mPreferenceGroup;

    @Mock
    private FragmentController mMockFragmentController;
    @Mock
    private UidDetailProvider mMockUidDetailProvider;
    @Mock
    private UidDetail mMockUidDetail;

    @Before
    @UiThreadTest
    public void setUp() {
        MockitoAnnotations.initMocks(this);
        mLifecycleOwner = new TestLifecycleOwner();

        mCarUxRestrictions = new CarUxRestrictions.Builder(/* reqOpt= */ true,
                CarUxRestrictions.UX_RESTRICTIONS_BASELINE, /* timestamp= */ 0).build();
        mPreferenceController = new TestAppDataUsagePreferenceController(mContext,
                /* preferenceKey= */ "key", mMockFragmentController,
                mCarUxRestrictions, mMockUidDetailProvider);
        PreferenceManager preferenceManager = new PreferenceManager(mContext);
        PreferenceScreen screen = preferenceManager.createPreferenceScreen(mContext);
        mPreferenceGroup = new LogicalPreferenceGroup(mContext);
        screen.addPreference(mPreferenceGroup);
        PreferenceControllerTestUtil.assignPreference(mPreferenceController, mPreferenceGroup);
        mPreferenceController.onCreate(mLifecycleOwner);
    }

    private static class TestAppDataUsagePreferenceController
            extends AppDataUsagePreferenceController {
        private final Queue<NetworkStats.Bucket> mMockedBuckets = new LinkedBlockingQueue<>();

        TestAppDataUsagePreferenceController(Context context, String preferenceKey,
                FragmentController fragmentController,
                CarUxRestrictions uxRestrictions,
                UidDetailProvider uidDetailProvider) {
            super(context, preferenceKey, fragmentController, uxRestrictions, uidDetailProvider);
        }

        public void addBucket(NetworkStats.Bucket bucket) {
            mMockedBuckets.add(bucket);
        }

        @Override
        public boolean hasNextBucket(@NonNull NetworkStats unused) {
            return !mMockedBuckets.isEmpty();
        }

        @Override
        public NetworkStats.Bucket getNextBucket(@NonNull NetworkStats unused) {
            return mMockedBuckets.remove();
        }
    }

    @Test
    public void defaultInitialize_hasNoPreference() {
        assertThat(mPreferenceGroup.getPreferenceCount()).isEqualTo(0);
    }

    @Test
    public void onDataLoaded_dataNotLoaded_hasNoPreference() {
        mPreferenceController.onDataLoaded(null, new int[0]);

        assertThat(mPreferenceGroup.getPreferenceCount()).isEqualTo(0);
    }

    @Test
    public void onDataLoaded_statsSizeZero_hasNoPreference() {
        mPreferenceController.onDataLoaded(mock(NetworkStats.class), new int[0]);

        assertThat(mPreferenceGroup.getPreferenceCount()).isEqualTo(0);
    }

    private NetworkStats.Bucket getMockBucket(int uid, long rxBytes, long txBytes) {
        NetworkStats.Bucket ret = mock(NetworkStats.Bucket.class);
        when(ret.getUid()).thenReturn(uid);
        when(ret.getRxBytes()).thenReturn(rxBytes);
        when(ret.getTxBytes()).thenReturn(txBytes);
        return ret;
    }

    @Test
    public void onDataLoaded_statsLoaded_hasTwoPreference() {
        mPreferenceController.addBucket(getMockBucket(0, 100, 0));
        mPreferenceController.addBucket(getMockBucket(UID_TETHERING, 200, 0));

        mPreferenceController.onDataLoaded(mock(NetworkStats.class), new int[0]);

        assertThat(mPreferenceGroup.getPreferenceCount()).isEqualTo(2);
    }

    @Test
    public void onDataLoaded_statsLoaded_hasOnePreference() {
        when(mMockUidDetailProvider.getUidDetail(anyInt(), anyBoolean()))
                .thenReturn(mMockUidDetail);
        mPreferenceController.addBucket(getMockBucket(0, 100, 0));
        mPreferenceController.addBucket(getMockBucket(UID_TETHERING, 200, 0));

        mPreferenceController.onDataLoaded(mock(NetworkStats.class), new int[0]);

        ProgressBarPreference preference1 =
                (ProgressBarPreference) mPreferenceGroup.getPreference(0);
        ProgressBarPreference preference2 =
                (ProgressBarPreference) mPreferenceGroup.getPreference(1);
        assertThat(mPreferenceGroup.getPreferenceCount()).isEqualTo(2);
        assertThat(preference1.getProgress()).isEqualTo(100);
        assertThat(preference2.getProgress()).isEqualTo(50);
    }
}