/*
 * 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.server.appsearch.stats;

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

import static org.mockito.Mockito.anyInt;
import static org.mockito.Mockito.eq;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

import android.annotation.NonNull;
import android.app.appsearch.stats.BaseStats;
import android.app.appsearch.testutil.FakeAppSearchConfig;
import android.content.Context;
import android.content.ContextWrapper;
import android.content.pm.PackageManager;
import android.os.UserHandle;
import android.util.ArrayMap;

import androidx.test.core.app.ApplicationProvider;

import com.android.server.appsearch.external.localstorage.stats.CallStats;

import org.junit.Before;
import org.junit.Test;
import org.mockito.Mockito;

import java.util.Map;

/**
 * Tests covering the functionalities in {@link PlatformLogger} NOT requiring overriding any flags
 * in {@link android.provider.DeviceConfig}.
 *
 * <p>To add tests rely on overriding the flags, please add them in the
 * tests for {@link PlatformLogger} in mockingservicestests.
 */
public class PlatformLoggerTest {
    private final Map<UserHandle, PackageManager> mMockPackageManagers = new ArrayMap<>();
    private Context mContext;

    @Before
    public void setUp() throws Exception {
        Context context = ApplicationProvider.getApplicationContext();
        mContext = new ContextWrapper(context) {
            @Override
            public PackageManager getPackageManager() {
                return getMockPackageManager(mContext.getUser());
            }
        };
    }

    /** Makes sure the caching works while getting the UID for calling package. */
    @Test
    public void testGetPackageUidAsUser() throws Exception {
        final String testPackageName = "packageName";
        final int testUid = 1234;
        PlatformLogger logger = new PlatformLogger(mContext, new FakeAppSearchConfig());
        PackageManager mockPackageManager = getMockPackageManager(mContext.getUser());
        when(mockPackageManager.getPackageUid(testPackageName, /*flags=*/0)).thenReturn(testUid);

        // First time, no cache
        PlatformLogger.ExtraStats extraStats = logger.createExtraStatsLocked(testPackageName,
                CallStats.CALL_TYPE_PUT_DOCUMENT, BaseStats.NO_FEATURES_ENABLED_BITMASK);
        verify(mockPackageManager, times(1))
                .getPackageUid(eq(testPackageName), /*flags=*/ anyInt());
        assertThat(extraStats.mPackageUid).isEqualTo(testUid);

        // Second time, we have cache
        extraStats = logger.createExtraStatsLocked(testPackageName,
                CallStats.CALL_TYPE_PUT_DOCUMENT, BaseStats.NO_FEATURES_ENABLED_BITMASK);

        // Count is still one since we will use the cache
        verify(mockPackageManager, times(1))
                .getPackageUid(eq(testPackageName), /*flags=*/ anyInt());
        assertThat(extraStats.mPackageUid).isEqualTo(testUid);

        // Remove the cache and try again
        assertThat(logger.removeCachedUidForPackage(testPackageName)).isEqualTo(testUid);
        extraStats = logger.createExtraStatsLocked(testPackageName,
                CallStats.CALL_TYPE_PUT_DOCUMENT, BaseStats.NO_FEATURES_ENABLED_BITMASK);

        // count increased by 1 since cache is cleared
        verify(mockPackageManager, times(2))
                .getPackageUid(eq(testPackageName), /*flags=*/ anyInt());
        assertThat(extraStats.mPackageUid).isEqualTo(testUid);
    }

    @NonNull
    private PackageManager getMockPackageManager(@NonNull UserHandle user) {
        PackageManager pm = mMockPackageManagers.get(user);
        if (pm == null) {
            pm = Mockito.mock(PackageManager.class);
            mMockPackageManagers.put(user, pm);
        }
        return pm;
    }
}