/*
 * Copyright (C) 2018 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.systemui.bubbles;

import static android.app.Notification.FLAG_BUBBLE;
import static android.app.NotificationManager.BUBBLE_PREFERENCE_NONE;
import static android.app.NotificationManager.BUBBLE_PREFERENCE_SELECTED;
import static android.service.notification.NotificationListenerService.REASON_APP_CANCEL;
import static android.service.notification.NotificationListenerService.REASON_APP_CANCEL_ALL;
import static android.service.notification.NotificationListenerService.REASON_CANCEL;
import static android.service.notification.NotificationListenerService.REASON_CANCEL_ALL;
import static android.service.notification.NotificationListenerService.REASON_CLICK;
import static android.service.notification.NotificationListenerService.REASON_GROUP_SUMMARY_CANCELED;
import static android.view.Display.DEFAULT_DISPLAY;
import static android.view.Display.INVALID_DISPLAY;
import static android.view.View.INVISIBLE;
import static android.view.View.VISIBLE;
import static android.view.WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_ALWAYS;

import static com.android.systemui.bubbles.BubbleDebugConfig.DEBUG_BUBBLE_CONTROLLER;
import static com.android.systemui.bubbles.BubbleDebugConfig.TAG_BUBBLES;
import static com.android.systemui.bubbles.BubbleDebugConfig.TAG_WITH_CLASS_NAME;
import static com.android.systemui.statusbar.StatusBarState.SHADE;
import static com.android.systemui.statusbar.notification.NotificationEntryManager.UNDEFINED_DISMISS_REASON;

import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.LOCAL_VARIABLE;
import static java.lang.annotation.ElementType.PARAMETER;
import static java.lang.annotation.RetentionPolicy.SOURCE;

import android.annotation.NonNull;
import android.annotation.UserIdInt;
import android.app.ActivityManager.RunningTaskInfo;
import android.app.INotificationManager;
import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageManager;
import android.content.res.Configuration;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.os.Binder;
import android.os.Handler;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.service.notification.NotificationListenerService;
import android.service.notification.NotificationListenerService.RankingMap;
import android.service.notification.ZenModeConfig;
import android.util.ArraySet;
import android.util.Log;
import android.util.Pair;
import android.util.SparseSetArray;
import android.view.Display;
import android.view.ViewGroup;
import android.view.WindowManager;

import androidx.annotation.IntDef;
import androidx.annotation.MainThread;
import androidx.annotation.Nullable;

import com.android.internal.annotations.VisibleForTesting;
import com.android.internal.statusbar.IStatusBarService;
import com.android.internal.statusbar.NotificationVisibility;
import com.android.systemui.Dumpable;
import com.android.systemui.bubbles.dagger.BubbleModule;
import com.android.systemui.dump.DumpManager;
import com.android.systemui.model.SysUiState;
import com.android.systemui.plugins.statusbar.StatusBarStateController;
import com.android.systemui.shared.system.ActivityManagerWrapper;
import com.android.systemui.shared.system.PinnedStackListenerForwarder;
import com.android.systemui.shared.system.TaskStackChangeListener;
import com.android.systemui.shared.system.WindowManagerWrapper;
import com.android.systemui.statusbar.FeatureFlags;
import com.android.systemui.statusbar.NotificationLockscreenUserManager;
import com.android.systemui.statusbar.NotificationRemoveInterceptor;
import com.android.systemui.statusbar.ScrimView;
import com.android.systemui.statusbar.notification.NotificationChannelHelper;
import com.android.systemui.statusbar.notification.NotificationEntryListener;
import com.android.systemui.statusbar.notification.NotificationEntryManager;
import com.android.systemui.statusbar.notification.collection.NotifCollection;
import com.android.systemui.statusbar.notification.collection.NotifPipeline;
import com.android.systemui.statusbar.notification.collection.NotificationEntry;
import com.android.systemui.statusbar.notification.collection.notifcollection.NotifCollectionListener;
import com.android.systemui.statusbar.notification.interruption.NotificationInterruptStateProvider;
import com.android.systemui.statusbar.phone.NotificationGroupManager;
import com.android.systemui.statusbar.phone.NotificationShadeWindowController;
import com.android.systemui.statusbar.phone.ScrimController;
import com.android.systemui.statusbar.phone.ShadeController;
import com.android.systemui.statusbar.phone.StatusBar;
import com.android.systemui.statusbar.policy.ConfigurationController;
import com.android.systemui.statusbar.policy.ZenModeController;
import com.android.systemui.util.FloatingContentCoordinator;

import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

/**
 * Bubbles are a special type of content that can "float" on top of other apps or System UI.
 * Bubbles can be expanded to show more content.
 *
 * The controller manages addition, removal, and visible state of bubbles on screen.
 */
public class BubbleController implements ConfigurationController.ConfigurationListener, Dumpable {

    private static final String TAG = TAG_WITH_CLASS_NAME ? "BubbleController" : TAG_BUBBLES;

    @Retention(SOURCE)
    @IntDef({DISMISS_USER_GESTURE, DISMISS_AGED, DISMISS_TASK_FINISHED, DISMISS_BLOCKED,
            DISMISS_NOTIF_CANCEL, DISMISS_ACCESSIBILITY_ACTION, DISMISS_NO_LONGER_BUBBLE,
            DISMISS_USER_CHANGED, DISMISS_GROUP_CANCELLED, DISMISS_INVALID_INTENT,
            DISMISS_OVERFLOW_MAX_REACHED})
    @Target({FIELD, LOCAL_VARIABLE, PARAMETER})
    @interface DismissReason {}

    static final int DISMISS_USER_GESTURE = 1;
    static final int DISMISS_AGED = 2;
    static final int DISMISS_TASK_FINISHED = 3;
    static final int DISMISS_BLOCKED = 4;
    static final int DISMISS_NOTIF_CANCEL = 5;
    static final int DISMISS_ACCESSIBILITY_ACTION = 6;
    static final int DISMISS_NO_LONGER_BUBBLE = 7;
    static final int DISMISS_USER_CHANGED = 8;
    static final int DISMISS_GROUP_CANCELLED = 9;
    static final int DISMISS_INVALID_INTENT = 10;
    static final int DISMISS_OVERFLOW_MAX_REACHED = 11;

    private final Context mContext;
    private final NotificationEntryManager mNotificationEntryManager;
    private final NotifPipeline mNotifPipeline;
    private final BubbleTaskStackListener mTaskStackListener;
    private BubbleExpandListener mExpandListener;
    @Nullable private BubbleStackView.SurfaceSynchronizer mSurfaceSynchronizer;
    private final NotificationGroupManager mNotificationGroupManager;
    private final ShadeController mShadeController;
    private final FloatingContentCoordinator mFloatingContentCoordinator;
    private final BubbleDataRepository mDataRepository;

    private BubbleData mBubbleData;
    private ScrimView mBubbleScrim;
    @Nullable private BubbleStackView mStackView;
    private BubbleIconFactory mBubbleIconFactory;

    // Tracks the id of the current (foreground) user.
    private int mCurrentUserId;
    // Saves notification keys of active bubbles when users are switched.
    private final SparseSetArray<String> mSavedBubbleKeysPerUser;

    // Used when ranking updates occur and we check if things should bubble / unbubble
    private NotificationListenerService.Ranking mTmpRanking;

    // Bubbles get added to the status bar view
    private final NotificationShadeWindowController mNotificationShadeWindowController;
    private final ZenModeController mZenModeController;
    private StatusBarStateListener mStatusBarStateListener;
    private INotificationManager mINotificationManager;

    // Callback that updates BubbleOverflowActivity on data change.
    @Nullable private Runnable mOverflowCallback = null;

    private final NotificationInterruptStateProvider mNotificationInterruptStateProvider;
    private IStatusBarService mBarService;
    private WindowManager mWindowManager;
    private SysUiState mSysUiState;

    // Used to post to main UI thread
    private Handler mHandler = new Handler();

    /** LayoutParams used to add the BubbleStackView to the window manager. */
    private WindowManager.LayoutParams mWmLayoutParams;
    /** Whether or not the BubbleStackView has been added to the WindowManager. */
    private boolean mAddedToWindowManager = false;

    // Used for determining view rect for touch interaction
    private Rect mTempRect = new Rect();

    // Listens to user switch so bubbles can be saved and restored.
    private final NotificationLockscreenUserManager mNotifUserManager;

    /** Last known orientation, used to detect orientation changes in {@link #onConfigChanged}. */
    private int mOrientation = Configuration.ORIENTATION_UNDEFINED;

    /**
     * Last known screen density, used to detect display size changes in {@link #onConfigChanged}.
     */
    private int mDensityDpi = Configuration.DENSITY_DPI_UNDEFINED;

    private boolean mInflateSynchronously;

    // TODO (b/145659174): allow for multiple callbacks to support the "shadow" new notif pipeline
    private final List<NotifCallback> mCallbacks = new ArrayList<>();

    /**
     * Listener to find out about stack expansion / collapse events.
     */
    public interface BubbleExpandListener {
        /**
         * Called when the expansion state of the bubble stack changes.
         *
         * @param isExpanding whether it's expanding or collapsing
         * @param key the notification key associated with bubble being expanded
         */
        void onBubbleExpandChanged(boolean isExpanding, String key);
    }

    /**
     * Listener to be notified when a bubbles' notification suppression state changes.
     */
    public interface NotificationSuppressionChangedListener {
        /**
         * Called when the notification suppression state of a bubble changes.
         */
        void onBubbleNotificationSuppressionChange(Bubble bubble);
    }

    /**
     * Callback for when the BubbleController wants to interact with the notification pipeline to:
     * - Remove a previously bubbled notification
     * - Update the notification shade since bubbled notification should/shouldn't be showing
     */
    public interface NotifCallback {
        /**
         * Called when a bubbled notification that was hidden from the shade is now being removed
         * This can happen when an app cancels a bubbled notification or when the user dismisses a
         * bubble.
         */
        void removeNotification(@NonNull NotificationEntry entry, int reason);

        /**
         * Called when a bubbled notification has changed whether it should be
         * filtered from the shade.
         */
        void invalidateNotifications(@NonNull String reason);

        /**
         * Called on a bubbled entry that has been removed when there are no longer
         * bubbled entries in its group.
         *
         * Checks whether its group has any other (non-bubbled) children. If it doesn't,
         * removes all remnants of the group's summary from the notification pipeline.
         * TODO: (b/145659174) Only old pipeline needs this - delete post-migration.
         */
        void maybeCancelSummary(@NonNull NotificationEntry entry);
    }

    /**
     * Listens for the current state of the status bar and updates the visibility state
     * of bubbles as needed.
     */
    private class StatusBarStateListener implements StatusBarStateController.StateListener {
        private int mState;
        /**
         * Returns the current status bar state.
         */
        public int getCurrentState() {
            return mState;
        }

        @Override
        public void onStateChanged(int newState) {
            mState = newState;
            boolean shouldCollapse = (mState != SHADE);
            if (shouldCollapse) {
                collapseStack();
            }
            updateStack();
        }
    }

    /**
     * Injected constructor. See {@link BubbleModule}.
     */
    public BubbleController(Context context,
            NotificationShadeWindowController notificationShadeWindowController,
            StatusBarStateController statusBarStateController,
            ShadeController shadeController,
            BubbleData data,
            @Nullable BubbleStackView.SurfaceSynchronizer synchronizer,
            ConfigurationController configurationController,
            NotificationInterruptStateProvider interruptionStateProvider,
            ZenModeController zenModeController,
            NotificationLockscreenUserManager notifUserManager,
            NotificationGroupManager groupManager,
            NotificationEntryManager entryManager,
            NotifPipeline notifPipeline,
            FeatureFlags featureFlags,
            DumpManager dumpManager,
            FloatingContentCoordinator floatingContentCoordinator,
            BubbleDataRepository dataRepository,
            SysUiState sysUiState,
            INotificationManager notificationManager,
            WindowManager windowManager) {
        dumpManager.registerDumpable(TAG, this);
        mContext = context;
        mShadeController = shadeController;
        mNotificationInterruptStateProvider = interruptionStateProvider;
        mNotifUserManager = notifUserManager;
        mZenModeController = zenModeController;
        mFloatingContentCoordinator = floatingContentCoordinator;
        mDataRepository = dataRepository;
        mINotificationManager = notificationManager;
        mZenModeController.addCallback(new ZenModeController.Callback() {
            @Override
            public void onZenChanged(int zen) {
                for (Bubble b : mBubbleData.getBubbles()) {
                    b.setShowDot(b.showInShade());
                }
            }

            @Override
            public void onConfigChanged(ZenModeConfig config) {
                for (Bubble b : mBubbleData.getBubbles()) {
                    b.setShowDot(b.showInShade());
                }
            }
        });

        configurationController.addCallback(this /* configurationListener */);
        mSysUiState = sysUiState;

        mBubbleData = data;
        mBubbleData.setListener(mBubbleDataListener);
        mBubbleData.setSuppressionChangedListener(new NotificationSuppressionChangedListener() {
            @Override
            public void onBubbleNotificationSuppressionChange(Bubble bubble) {
                // Make sure NoMan knows it's not showing in the shade anymore so anyone querying it
                // can tell.
                try {
                    mBarService.onBubbleNotificationSuppressionChanged(bubble.getKey(),
                            !bubble.showInShade());
                } catch (RemoteException e) {
                    // Bad things have happened
                }
            }
        });

        mNotificationEntryManager = entryManager;
        mNotificationGroupManager = groupManager;
        mNotifPipeline = notifPipeline;

        if (!featureFlags.isNewNotifPipelineRenderingEnabled()) {
            setupNEM();
        } else {
            setupNotifPipeline();
        }

        mNotificationShadeWindowController = notificationShadeWindowController;
        mStatusBarStateListener = new StatusBarStateListener();
        statusBarStateController.addCallback(mStatusBarStateListener);

        mTaskStackListener = new BubbleTaskStackListener();
        ActivityManagerWrapper.getInstance().registerTaskStackListener(mTaskStackListener);

        try {
            WindowManagerWrapper.getInstance().addPinnedStackListener(new BubblesImeListener());
        } catch (RemoteException e) {
            e.printStackTrace();
        }
        mSurfaceSynchronizer = synchronizer;

        mWindowManager = windowManager;
        mBarService = IStatusBarService.Stub.asInterface(
                ServiceManager.getService(Context.STATUS_BAR_SERVICE));

        mBubbleScrim = new ScrimView(mContext);

        mSavedBubbleKeysPerUser = new SparseSetArray<>();
        mCurrentUserId = mNotifUserManager.getCurrentUserId();
        mNotifUserManager.addUserChangedListener(
                new NotificationLockscreenUserManager.UserChangedListener() {
                    @Override
                    public void onUserChanged(int newUserId) {
                        BubbleController.this.saveBubbles(mCurrentUserId);
                        mBubbleData.dismissAll(DISMISS_USER_CHANGED);
                        BubbleController.this.restoreBubbles(newUserId);
                        mCurrentUserId = newUserId;
                    }
                });

        mBubbleIconFactory = new BubbleIconFactory(context);
    }

    /**
     * See {@link NotifCallback}.
     */
    public void addNotifCallback(NotifCallback callback) {
        mCallbacks.add(callback);
    }

    private void setupNEM() {
        mNotificationEntryManager.addNotificationEntryListener(
                new NotificationEntryListener() {
                    @Override
                    public void onPendingEntryAdded(NotificationEntry entry) {
                        onEntryAdded(entry);
                    }

                    @Override
                    public void onPreEntryUpdated(NotificationEntry entry) {
                        onEntryUpdated(entry);
                    }

                    @Override
                    public void onEntryRemoved(
                            NotificationEntry entry,
                            @android.annotation.Nullable NotificationVisibility visibility,
                            boolean removedByUser,
                            int reason) {
                        BubbleController.this.onEntryRemoved(entry);
                    }

                    @Override
                    public void onNotificationRankingUpdated(RankingMap rankingMap) {
                        onRankingUpdated(rankingMap);
                    }
                });

        mNotificationEntryManager.addNotificationRemoveInterceptor(
                new NotificationRemoveInterceptor() {
                    @Override
                    public boolean onNotificationRemoveRequested(
                            String key,
                            NotificationEntry entry,
                            int dismissReason) {
                        final boolean isClearAll = dismissReason == REASON_CANCEL_ALL;
                        final boolean isUserDimiss = dismissReason == REASON_CANCEL
                                || dismissReason == REASON_CLICK;
                        final boolean isAppCancel = dismissReason == REASON_APP_CANCEL
                                || dismissReason == REASON_APP_CANCEL_ALL;
                        final boolean isSummaryCancel =
                                dismissReason == REASON_GROUP_SUMMARY_CANCELED;

                        // Need to check for !appCancel here because the notification may have
                        // previously been dismissed & entry.isRowDismissed would still be true
                        boolean userRemovedNotif =
                                (entry != null && entry.isRowDismissed() && !isAppCancel)
                                || isClearAll || isUserDimiss || isSummaryCancel;

                        if (userRemovedNotif) {
                            return handleDismissalInterception(entry);
                        }
                        return false;
                    }
                });

        mNotificationGroupManager.addOnGroupChangeListener(
                new NotificationGroupManager.OnGroupChangeListener() {
                    @Override
                    public void onGroupSuppressionChanged(
                            NotificationGroupManager.NotificationGroup group,
                            boolean suppressed) {
                        // More notifications could be added causing summary to no longer
                        // be suppressed -- in this case need to remove the key.
                        final String groupKey = group.summary != null
                                ? group.summary.getSbn().getGroupKey()
                                : null;
                        if (!suppressed && groupKey != null
                                && mBubbleData.isSummarySuppressed(groupKey)) {
                            mBubbleData.removeSuppressedSummary(groupKey);
                        }
                    }
                });

        addNotifCallback(new NotifCallback() {
            @Override
            public void removeNotification(NotificationEntry entry, int reason) {
                mNotificationEntryManager.performRemoveNotification(entry.getSbn(),
                        reason);
            }

            @Override
            public void invalidateNotifications(String reason) {
                mNotificationEntryManager.updateNotifications(reason);
            }

            @Override
            public void maybeCancelSummary(NotificationEntry entry) {
                // Check if removed bubble has an associated suppressed group summary that needs
                // to be removed now.
                final String groupKey = entry.getSbn().getGroupKey();
                if (mBubbleData.isSummarySuppressed(groupKey)) {
                    mBubbleData.removeSuppressedSummary(groupKey);

                    final NotificationEntry summary =
                            mNotificationEntryManager.getActiveNotificationUnfiltered(
                                    mBubbleData.getSummaryKey(groupKey));
                    if (summary != null) {
                        mNotificationEntryManager.performRemoveNotification(summary.getSbn(),
                                UNDEFINED_DISMISS_REASON);
                    }
                }

                // Check if we still need to remove the summary from NoManGroup because the summary
                // may not be in the mBubbleData.mSuppressedGroupKeys list and removed above.
                // For example:
                // 1. Bubbled notifications (group) is posted to shade and are visible bubbles
                // 2. User expands bubbles so now their respective notifications in the shade are
                // hidden, including the group summary
                // 3. User removes all bubbles
                // 4. We expect all the removed bubbles AND the summary (note: the summary was
                // never added to the suppressedSummary list in BubbleData, so we add this check)
                NotificationEntry summary =
                        mNotificationGroupManager.getLogicalGroupSummary(entry.getSbn());
                if (summary != null) {
                    ArrayList<NotificationEntry> summaryChildren =
                            mNotificationGroupManager.getLogicalChildren(summary.getSbn());
                    boolean isSummaryThisNotif = summary.getKey().equals(entry.getKey());
                    if (!isSummaryThisNotif && (summaryChildren == null
                            || summaryChildren.isEmpty())) {
                        mNotificationEntryManager.performRemoveNotification(summary.getSbn(),
                                UNDEFINED_DISMISS_REASON);
                    }
                }
            }
        });
    }

    private void setupNotifPipeline() {
        mNotifPipeline.addCollectionListener(new NotifCollectionListener() {
            @Override
            public void onEntryAdded(NotificationEntry entry) {
                BubbleController.this.onEntryAdded(entry);
            }

            @Override
            public void onEntryUpdated(NotificationEntry entry) {
                BubbleController.this.onEntryUpdated(entry);
            }

            @Override
            public void onRankingUpdate(RankingMap rankingMap) {
                onRankingUpdated(rankingMap);
            }

            @Override
            public void onEntryRemoved(NotificationEntry entry,
                    @NotifCollection.CancellationReason int reason) {
                BubbleController.this.onEntryRemoved(entry);
            }
        });
    }

    /**
     * Returns the scrim drawn behind the bubble stack. This is managed by {@link ScrimController}
     * since we want the scrim's appearance and behavior to be identical to that of the notification
     * shade scrim.
     */
    public ScrimView getScrimForBubble() {
        return mBubbleScrim;
    }

    /**
     * Sets whether to perform inflation on the same thread as the caller. This method should only
     * be used in tests, not in production.
     */
    @VisibleForTesting
    void setInflateSynchronously(boolean inflateSynchronously) {
        mInflateSynchronously = inflateSynchronously;
    }

    void setOverflowCallback(Runnable updateOverflow) {
        mOverflowCallback = updateOverflow;
    }

    /**
     * @return Bubbles for updating overflow.
     */
    List<Bubble> getOverflowBubbles() {
        return mBubbleData.getOverflowBubbles();
    }

    /**
     * BubbleStackView is lazily created by this method the first time a Bubble is added. This
     * method initializes the stack view and adds it to the StatusBar just above the scrim.
     */
    private void ensureStackViewCreated() {
        if (mStackView == null) {
            mStackView = new BubbleStackView(
                    mContext, mBubbleData, mSurfaceSynchronizer, mFloatingContentCoordinator,
                    mSysUiState, mNotificationShadeWindowController, this::onAllBubblesAnimatedOut);
            mStackView.addView(mBubbleScrim);
            if (mExpandListener != null) {
                mStackView.setExpandListener(mExpandListener);
            }

            mStackView.setUnbubbleConversationCallback(notificationEntry ->
                    onUserChangedBubble(notificationEntry, false /* shouldBubble */));
            // Lazy load overflow bubbles from disk
            loadOverflowBubblesFromDisk();
        }

        addToWindowManagerMaybe();
    }

    /** Adds the BubbleStackView to the WindowManager if it's not already there. */
    private void addToWindowManagerMaybe() {
        // If the stack is null, or already added, don't add it.
        if (mStackView == null || mAddedToWindowManager) {
            return;
        }

        mWmLayoutParams = new WindowManager.LayoutParams(
                // Fill the screen so we can use translation animations to position the bubble
                // stack. We'll use touchable regions to ignore touches that are not on the bubbles
                // themselves.
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT,
                WindowManager.LayoutParams.TYPE_TRUSTED_APPLICATION_OVERLAY,
                // Start not focusable - we'll become focusable when expanded so the ActivityView
                // can use the IME.
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
                    | WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED,
                PixelFormat.TRANSLUCENT);

        mWmLayoutParams.setFitInsetsTypes(0);
        mWmLayoutParams.softInputMode = WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE;
        mWmLayoutParams.token = new Binder();
        mWmLayoutParams.setTitle("Bubbles!");
        mWmLayoutParams.packageName = mContext.getPackageName();
        mWmLayoutParams.layoutInDisplayCutoutMode = LAYOUT_IN_DISPLAY_CUTOUT_MODE_ALWAYS;

        try {
            mAddedToWindowManager = true;
            mWindowManager.addView(mStackView, mWmLayoutParams);
        } catch (IllegalStateException e) {
            // This means the stack has already been added. This shouldn't happen, since we keep
            // track of that, but just in case, update the previously added view's layout params.
            e.printStackTrace();
            updateWmFlags();
        }
    }

    /** Removes the BubbleStackView from the WindowManager if it's there. */
    private void removeFromWindowManagerMaybe() {
        if (!mAddedToWindowManager) {
            return;
        }

        try {
            mAddedToWindowManager = false;
            mWindowManager.removeView(mStackView);
        } catch (IllegalArgumentException e) {
            // This means the stack has already been removed - it shouldn't happen, but ignore if it
            // does, since we wanted it removed anyway.
            e.printStackTrace();
        }
    }

    /**
     * Updates the BubbleStackView's WindowManager.LayoutParams, and updates the WindowManager with
     * the new params if the stack has been added.
     */
    private void updateWmFlags() {
        if (isStackExpanded()) {
            // If we're expanded, we want to be focusable so that the ActivityView can receive focus
            // and show the IME.
            mWmLayoutParams.flags &= ~WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
        } else {
            // If we're collapsed, we don't want to be able to receive focus. Doing so would
            // preclude applications from using the IME since we are always above them.
            mWmLayoutParams.flags |= WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
        }

        if (mStackView != null && mAddedToWindowManager) {
            try {
                mWindowManager.updateViewLayout(mStackView, mWmLayoutParams);
            } catch (IllegalArgumentException e) {
                // If the stack is somehow not there, ignore the attempt to update it.
                e.printStackTrace();
            }
        }
    }

    /**
     * Called by the BubbleStackView and whenever all bubbles have animated out, and none have been
     * added in the meantime.
     */
    private void onAllBubblesAnimatedOut() {
        if (mStackView != null) {
            mStackView.setVisibility(INVISIBLE);
            removeFromWindowManagerMaybe();
        }
    }

    /**
     * Records the notification key for any active bubbles. These are used to restore active
     * bubbles when the user returns to the foreground.
     *
     * @param userId the id of the user
     */
    private void saveBubbles(@UserIdInt int userId) {
        // First clear any existing keys that might be stored.
        mSavedBubbleKeysPerUser.remove(userId);
        // Add in all active bubbles for the current user.
        for (Bubble bubble: mBubbleData.getBubbles()) {
            mSavedBubbleKeysPerUser.add(userId, bubble.getKey());
        }
    }

    /**
     * Promotes existing notifications to Bubbles if they were previously bubbles.
     *
     * @param userId the id of the user
     */
    private void restoreBubbles(@UserIdInt int userId) {
        ArraySet<String> savedBubbleKeys = mSavedBubbleKeysPerUser.get(userId);
        if (savedBubbleKeys == null) {
            // There were no bubbles saved for this used.
            return;
        }
        for (NotificationEntry e :
                mNotificationEntryManager.getActiveNotificationsForCurrentUser()) {
            if (savedBubbleKeys.contains(e.getKey())
                    && mNotificationInterruptStateProvider.shouldBubbleUp(e)
                    && e.isBubble()
                    && canLaunchInActivityView(mContext, e)) {
                updateBubble(e, true /* suppressFlyout */, false /* showInShade */);
            }
        }
        // Finally, remove the entries for this user now that bubbles are restored.
        mSavedBubbleKeysPerUser.remove(mCurrentUserId);
    }

    @Override
    public void onUiModeChanged() {
        updateForThemeChanges();
    }

    @Override
    public void onOverlayChanged() {
        updateForThemeChanges();
    }

    private void updateForThemeChanges() {
        if (mStackView != null) {
            mStackView.onThemeChanged();
        }
        mBubbleIconFactory = new BubbleIconFactory(mContext);
        // Reload each bubble
        for (Bubble b: mBubbleData.getBubbles()) {
            b.inflate(null /* callback */, mContext, mStackView, mBubbleIconFactory,
                    false /* skipInflation */);
        }
        for (Bubble b: mBubbleData.getOverflowBubbles()) {
            b.inflate(null /* callback */, mContext, mStackView, mBubbleIconFactory,
                    false /* skipInflation */);
        }
    }

    @Override
    public void onConfigChanged(Configuration newConfig) {
        if (mStackView != null && newConfig != null) {
            if (newConfig.orientation != mOrientation) {
                mOrientation = newConfig.orientation;
                mStackView.onOrientationChanged(newConfig.orientation);
            }
            if (newConfig.densityDpi != mDensityDpi) {
                mDensityDpi = newConfig.densityDpi;
                mBubbleIconFactory = new BubbleIconFactory(mContext);
                mStackView.onDisplaySizeChanged();
            }
        }
    }

    boolean inLandscape() {
        return mOrientation == Configuration.ORIENTATION_LANDSCAPE;
    }

    /**
     * Set a listener to be notified of bubble expand events.
     */
    public void setExpandListener(BubbleExpandListener listener) {
        mExpandListener = ((isExpanding, key) -> {
            if (listener != null) {
                listener.onBubbleExpandChanged(isExpanding, key);
            }

            updateWmFlags();
        });
        if (mStackView != null) {
            mStackView.setExpandListener(mExpandListener);
        }
    }

    /**
     * Whether or not there are bubbles present, regardless of them being visible on the
     * screen (e.g. if on AOD).
     */
    @VisibleForTesting
    boolean hasBubbles() {
        if (mStackView == null) {
            return false;
        }
        return mBubbleData.hasBubbles();
    }

    /**
     * Whether the stack of bubbles is expanded or not.
     */
    public boolean isStackExpanded() {
        return mBubbleData.isExpanded();
    }

    /**
     * Tell the stack of bubbles to collapse.
     */
    public void collapseStack() {
        mBubbleData.setExpanded(false /* expanded */);
    }

    /**
     * True if either:
     * (1) There is a bubble associated with the provided key and if its notification is hidden
     *     from the shade.
     * (2) There is a group summary associated with the provided key that is hidden from the shade
     *     because it has been dismissed but still has child bubbles active.
     *
     * False otherwise.
     */
    public boolean isBubbleNotificationSuppressedFromShade(NotificationEntry entry) {
        String key = entry.getKey();
        boolean isSuppressedBubble = (mBubbleData.hasAnyBubbleWithKey(key)
                && !mBubbleData.getAnyBubbleWithkey(key).showInShade());

        String groupKey = entry.getSbn().getGroupKey();
        boolean isSuppressedSummary = mBubbleData.isSummarySuppressed(groupKey);
        boolean isSummary = key.equals(mBubbleData.getSummaryKey(groupKey));
        return (isSummary && isSuppressedSummary) || isSuppressedBubble;
    }

    void promoteBubbleFromOverflow(Bubble bubble) {
        bubble.setInflateSynchronously(mInflateSynchronously);
        setIsBubble(bubble, /* isBubble */ true);
        mBubbleData.promoteBubbleFromOverflow(bubble, mStackView, mBubbleIconFactory);
    }

    /**
     * Request the stack expand if needed, then select the specified Bubble as current.
     * If no bubble exists for this entry, one is created.
     *
     * @param entry the notification for the bubble to be selected
     */
    public void expandStackAndSelectBubble(NotificationEntry entry) {
        String key = entry.getKey();
        Bubble bubble = mBubbleData.getBubbleInStackWithKey(key);
        if (bubble != null) {
            mBubbleData.setSelectedBubble(bubble);
        } else {
            bubble = mBubbleData.getOverflowBubbleWithKey(key);
            if (bubble != null) {
                promoteBubbleFromOverflow(bubble);
            } else if (entry.canBubble()) {
                // It can bubble but it's not -- it got aged out of the overflow before it
                // was dismissed or opened, make it a bubble again.
                setIsBubble(entry, true);
                bubble.setShouldAutoExpand(true);
                updateBubble(entry, true /* suppressFlyout */, false /* showInShade */);
            }
        }

        mBubbleData.setExpanded(true);
    }

    /**
     * Directs a back gesture at the bubble stack. When opened, the current expanded bubble
     * is forwarded a back key down/up pair.
     */
    public void performBackPressIfNeeded() {
        if (mStackView != null) {
            mStackView.performBackPressIfNeeded();
        }
    }

    /**
     * Adds or updates a bubble associated with the provided notification entry.
     *
     * @param notif the notification associated with this bubble.
     */
    void updateBubble(NotificationEntry notif) {
        updateBubble(notif, false /* suppressFlyout */, true /* showInShade */);
    }

    /**
     * Fills the overflow bubbles by loading them from disk.
     */
    void loadOverflowBubblesFromDisk() {
        if (!mBubbleData.getOverflowBubbles().isEmpty()) {
            // we don't need to load overflow bubbles from disk if it is already in memory
            return;
        }
        mDataRepository.loadBubbles((bubbles) -> {
            bubbles.forEach(bubble -> {
                if (mBubbleData.getBubbles().contains(bubble)) {
                    // if the bubble is already active, there's no need to push it to overflow
                    return;
                }
                bubble.inflate((b) -> mBubbleData.overflowBubble(DISMISS_AGED, bubble),
                        mContext, mStackView, mBubbleIconFactory, true /* skipInflation */);
            });
            return null;
        });
    }

    void updateBubble(NotificationEntry notif, boolean suppressFlyout, boolean showInShade) {
        // Lazy init stack view when a bubble is created
        ensureStackViewCreated();
        // If this is an interruptive notif, mark that it's interrupted
        if (notif.getImportance() >= NotificationManager.IMPORTANCE_HIGH) {
            notif.setInterruption();
        }
        Bubble bubble = mBubbleData.getOrCreateBubble(notif);
        bubble.setInflateSynchronously(mInflateSynchronously);
        bubble.inflate(
                b -> {
                    mBubbleData.notificationEntryUpdated(b, suppressFlyout,
                            showInShade);
                    if (bubble.getBubbleIntent() == null) {
                        return;
                    }
                    bubble.getBubbleIntent().registerCancelListener(pendingIntent -> {
                        if (bubble.getWasAccessed()) {
                            bubble.setPendingIntentCanceled();
                            return;
                        }
                        mHandler.post(
                                () -> removeBubble(bubble.getKey(),
                                        BubbleController.DISMISS_INVALID_INTENT));
                    });
                },
                mContext, mStackView, mBubbleIconFactory, false /* skipInflation */);
    }

    /**
     * Called when a user has indicated that an active notification should be shown as a bubble.
     * <p>
     * This method will collapse the shade, create the bubble without a flyout or dot, and suppress
     * the notification from appearing in the shade.
     *
     * @param entry the notification to change bubble state for.
     * @param shouldBubble whether the notification should show as a bubble or not.
     */
    public void onUserChangedBubble(@Nullable final NotificationEntry entry, boolean shouldBubble) {
        if (entry == null) {
            return;
        }
        NotificationChannel channel = entry.getChannel();
        final String appPkg = entry.getSbn().getPackageName();
        final int appUid = entry.getSbn().getUid();
        if (channel == null || appPkg == null) {
            return;
        }

        // Update the state in NotificationManagerService
        try {
            int flags = Notification.BubbleMetadata.FLAG_SUPPRESS_NOTIFICATION;
            flags |= Notification.BubbleMetadata.FLAG_AUTO_EXPAND_BUBBLE;
            mBarService.onNotificationBubbleChanged(entry.getKey(), shouldBubble, flags);
        } catch (RemoteException e) {
        }

        // Change the settings
        channel = NotificationChannelHelper.createConversationChannelIfNeeded(mContext,
                mINotificationManager, entry, channel);
        channel.setAllowBubbles(shouldBubble);
        try {
            int currentPref = mINotificationManager.getBubblePreferenceForPackage(appPkg, appUid);
            if (shouldBubble && currentPref == BUBBLE_PREFERENCE_NONE) {
                mINotificationManager.setBubblesAllowed(appPkg, appUid, BUBBLE_PREFERENCE_SELECTED);
            }
            mINotificationManager.updateNotificationChannelForPackage(appPkg, appUid, channel);
        } catch (RemoteException e) {
            Log.e(TAG, e.getMessage());
        }

        if (shouldBubble) {
            mShadeController.collapsePanel(true);
            if (entry.getRow() != null) {
                entry.getRow().updateBubbleButton();
            }
        }
    }

    /**
     * Removes the bubble with the given key.
     * <p>
     * Must be called from the main thread.
     */
    @MainThread
    void removeBubble(String key, int reason) {
        if (mBubbleData.hasAnyBubbleWithKey(key)) {
            mBubbleData.notificationEntryRemoved(key, reason);
        }
    }

    private void onEntryAdded(NotificationEntry entry) {
        if (mNotificationInterruptStateProvider.shouldBubbleUp(entry)
                && entry.isBubble()
                && canLaunchInActivityView(mContext, entry)) {
            updateBubble(entry);
        }
    }

    private void onEntryUpdated(NotificationEntry entry) {
        // shouldBubbleUp checks canBubble & for bubble metadata
        boolean shouldBubble = mNotificationInterruptStateProvider.shouldBubbleUp(entry)
                && canLaunchInActivityView(mContext, entry);
        if (!shouldBubble && mBubbleData.hasAnyBubbleWithKey(entry.getKey())) {
            // It was previously a bubble but no longer a bubble -- lets remove it
            removeBubble(entry.getKey(), DISMISS_NO_LONGER_BUBBLE);
        } else if (shouldBubble && entry.isBubble()) {
            updateBubble(entry);
        }
    }

    private void onEntryRemoved(NotificationEntry entry) {
        if (isSummaryOfBubbles(entry)) {
            final String groupKey = entry.getSbn().getGroupKey();
            mBubbleData.removeSuppressedSummary(groupKey);

            // Remove any associated bubble children with the summary
            final List<Bubble> bubbleChildren = mBubbleData.getBubblesInGroup(groupKey);
            for (int i = 0; i < bubbleChildren.size(); i++) {
                removeBubble(bubbleChildren.get(i).getKey(), DISMISS_GROUP_CANCELLED);
            }
        } else {
            removeBubble(entry.getKey(), DISMISS_NOTIF_CANCEL);
        }
    }

    /**
     * Called when NotificationListener has received adjusted notification rank and reapplied
     * filtering and sorting. This is used to dismiss or create bubbles based on changes in
     * permissions on the notification channel or the global setting.
     *
     * @param rankingMap the updated ranking map from NotificationListenerService
     */
    private void onRankingUpdated(RankingMap rankingMap) {
        if (mTmpRanking == null) {
            mTmpRanking = new NotificationListenerService.Ranking();
        }
        String[] orderedKeys = rankingMap.getOrderedKeys();
        for (int i = 0; i < orderedKeys.length; i++) {
            String key = orderedKeys[i];
            NotificationEntry entry = mNotificationEntryManager.getPendingOrActiveNotif(key);
            rankingMap.getRanking(key, mTmpRanking);
            boolean isActiveBubble = mBubbleData.hasAnyBubbleWithKey(key);
            if (isActiveBubble && !mTmpRanking.canBubble()) {
                mBubbleData.notificationEntryRemoved(entry.getKey(),
                        BubbleController.DISMISS_BLOCKED);
            } else if (entry != null && mTmpRanking.isBubble() && !isActiveBubble) {
                entry.setFlagBubble(true);
                onEntryUpdated(entry);
            }
        }
    }

    private void setIsBubble(@NonNull final NotificationEntry entry, final boolean isBubble) {
        Objects.requireNonNull(entry);
        if (isBubble) {
            entry.getSbn().getNotification().flags |= FLAG_BUBBLE;
        } else {
            entry.getSbn().getNotification().flags &= ~FLAG_BUBBLE;
        }
        try {
            mBarService.onNotificationBubbleChanged(entry.getKey(), isBubble, 0);
        } catch (RemoteException e) {
            // Bad things have happened
        }
    }

    private void setIsBubble(@NonNull final Bubble b, final boolean isBubble) {
        Objects.requireNonNull(b);
        if (isBubble) {
            b.enable(FLAG_BUBBLE);
        } else {
            b.disable(FLAG_BUBBLE);
        }
        if (b.getEntry() != null) {
            setIsBubble(b.getEntry(), isBubble);
        } else {
            try {
                mBarService.onNotificationBubbleChanged(b.getKey(), isBubble, 0);
            } catch (RemoteException e) {
                // Bad things have happened
            }
        }
    }

    @SuppressWarnings("FieldCanBeLocal")
    private final BubbleData.Listener mBubbleDataListener = new BubbleData.Listener() {

        @Override
        public void applyUpdate(BubbleData.Update update) {
            // Update bubbles in overflow.
            if (mOverflowCallback != null) {
                mOverflowCallback.run();
            }

            // Collapsing? Do this first before remaining steps.
            if (update.expandedChanged && !update.expanded) {
                mStackView.setExpanded(false);
            }

            // Do removals, if any.
            ArrayList<Pair<Bubble, Integer>> removedBubbles =
                    new ArrayList<>(update.removedBubbles);
            ArrayList<Bubble> bubblesToBeRemovedFromRepository = new ArrayList<>();
            for (Pair<Bubble, Integer> removed : removedBubbles) {
                final Bubble bubble = removed.first;
                @DismissReason final int reason = removed.second;
                mStackView.removeBubble(bubble);

                // If the bubble is removed for user switching, leave the notification in place.
                if (reason == DISMISS_USER_CHANGED) {
                    continue;
                }
                if (reason == DISMISS_NOTIF_CANCEL) {
                    bubblesToBeRemovedFromRepository.add(bubble);
                }
                if (!mBubbleData.hasBubbleInStackWithKey(bubble.getKey())) {
                    if (!mBubbleData.hasOverflowBubbleWithKey(bubble.getKey())
                        && (!bubble.showInShade()
                            || reason == DISMISS_NOTIF_CANCEL
                            || reason == DISMISS_GROUP_CANCELLED)) {
                        // The bubble is now gone & the notification is hidden from the shade, so
                        // time to actually remove it
                        for (NotifCallback cb : mCallbacks) {
                            if (bubble.getEntry() != null) {
                                cb.removeNotification(bubble.getEntry(), REASON_CANCEL);
                            }
                        }
                    } else {
                        if (bubble.isBubble() && bubble.showInShade()) {
                            setIsBubble(bubble, false /* isBubble */);
                        }
                        if (bubble.getEntry() != null && bubble.getEntry().getRow() != null) {
                            bubble.getEntry().getRow().updateBubbleButton();
                        }
                    }

                }
                if (bubble.getEntry() != null) {
                    final String groupKey = bubble.getEntry().getSbn().getGroupKey();
                    if (mBubbleData.getBubblesInGroup(groupKey).isEmpty()) {
                        // Time to potentially remove the summary
                        for (NotifCallback cb : mCallbacks) {
                            cb.maybeCancelSummary(bubble.getEntry());
                        }
                    }
                }
            }
            mDataRepository.removeBubbles(mCurrentUserId, bubblesToBeRemovedFromRepository);

            if (update.addedBubble != null) {
                mDataRepository.addBubble(mCurrentUserId, update.addedBubble);
                mStackView.addBubble(update.addedBubble);

            }

            if (update.updatedBubble != null) {
                mStackView.updateBubble(update.updatedBubble);
            }

            // At this point, the correct bubbles are inflated in the stack.
            // Make sure the order in bubble data is reflected in bubble row.
            if (update.orderChanged) {
                mDataRepository.addBubbles(mCurrentUserId, update.bubbles);
                mStackView.updateBubbleOrder(update.bubbles);
            }

            if (update.selectionChanged) {
                mStackView.setSelectedBubble(update.selectedBubble);
                if (update.selectedBubble != null && update.selectedBubble.getEntry() != null) {
                    mNotificationGroupManager.updateSuppression(
                            update.selectedBubble.getEntry());
                }
            }

            // Expanding? Apply this last.
            if (update.expandedChanged && update.expanded) {
                mStackView.setExpanded(true);
            }

            for (NotifCallback cb : mCallbacks) {
                cb.invalidateNotifications("BubbleData.Listener.applyUpdate");
            }
            updateStack();

            if (DEBUG_BUBBLE_CONTROLLER) {
                Log.d(TAG, "\n[BubbleData] bubbles:");
                Log.d(TAG, BubbleDebugConfig.formatBubblesString(mBubbleData.getBubbles(),
                        mBubbleData.getSelectedBubble()));

                if (mStackView != null) {
                    Log.d(TAG, "\n[BubbleStackView]");
                    Log.d(TAG, BubbleDebugConfig.formatBubblesString(mStackView.getBubblesOnScreen(),
                            mStackView.getExpandedBubble()));
                }
                Log.d(TAG, "\n[BubbleData] overflow:");
                Log.d(TAG, BubbleDebugConfig.formatBubblesString(mBubbleData.getOverflowBubbles(),
                        null) + "\n");
            }
        }
    };

    /**
     * We intercept notification entries (including group summaries) dismissed by the user when
     * there is an active bubble associated with it. We do this so that developers can still
     * cancel it (and hence the bubbles associated with it). However, these intercepted
     * notifications should then be hidden from the shade since the user has cancelled them, so we
     *  {@link Bubble#setSuppressNotification}.  For the case of suppressed summaries, we also add
     *  {@link BubbleData#addSummaryToSuppress}.
     *
     * @return true if we want to intercept the dismissal of the entry, else false.
     */
    public boolean handleDismissalInterception(NotificationEntry entry) {
        if (entry == null) {
            return false;
        }
        if (isSummaryOfBubbles(entry)) {
            handleSummaryDismissalInterception(entry);
        } else {
            Bubble bubble = mBubbleData.getBubbleInStackWithKey(entry.getKey());
            if (bubble == null || !entry.isBubble()) {
                bubble = mBubbleData.getOverflowBubbleWithKey(entry.getKey());
            }
            if (bubble == null) {
                return false;
            }
            bubble.setSuppressNotification(true);
            bubble.setShowDot(false /* show */);
        }
        // Update the shade
        for (NotifCallback cb : mCallbacks) {
            cb.invalidateNotifications("BubbleController.handleDismissalInterception");
        }
        return true;
    }

    private boolean isSummaryOfBubbles(NotificationEntry entry) {
        if (entry == null) {
            return false;
        }

        String groupKey = entry.getSbn().getGroupKey();
        ArrayList<Bubble> bubbleChildren = mBubbleData.getBubblesInGroup(groupKey);
        boolean isSuppressedSummary = (mBubbleData.isSummarySuppressed(groupKey)
                && mBubbleData.getSummaryKey(groupKey).equals(entry.getKey()));
        boolean isSummary = entry.getSbn().getNotification().isGroupSummary();
        return (isSuppressedSummary || isSummary)
                && bubbleChildren != null
                && !bubbleChildren.isEmpty();
    }

    private void handleSummaryDismissalInterception(NotificationEntry summary) {
        // current children in the row:
        final List<NotificationEntry> children = summary.getAttachedNotifChildren();
        if (children != null) {
            for (int i = 0; i < children.size(); i++) {
                NotificationEntry child = children.get(i);
                if (mBubbleData.hasAnyBubbleWithKey(child.getKey())) {
                    // Suppress the bubbled child
                    // As far as group manager is concerned, once a child is no longer shown
                    // in the shade, it is essentially removed.
                    Bubble bubbleChild = mBubbleData.getAnyBubbleWithkey(child.getKey());
                    mNotificationGroupManager.onEntryRemoved(bubbleChild.getEntry());
                    bubbleChild.setSuppressNotification(true);
                    bubbleChild.setShowDot(false /* show */);
                } else {
                    // non-bubbled children can be removed
                    for (NotifCallback cb : mCallbacks) {
                        cb.removeNotification(child, REASON_GROUP_SUMMARY_CANCELED);
                    }
                }
            }
        }

        // And since all children are removed, remove the summary.
        mNotificationGroupManager.onEntryRemoved(summary);

        // TODO: (b/145659174) remove references to mSuppressedGroupKeys once fully migrated
        mBubbleData.addSummaryToSuppress(summary.getSbn().getGroupKey(),
                summary.getKey());
    }

    /**
     * Lets any listeners know if bubble state has changed.
     * Updates the visibility of the bubbles based on current state.
     * Does not un-bubble, just hides or un-hides.
     * Updates stack description for TalkBack focus.
     */
    public void updateStack() {
        if (mStackView == null) {
            return;
        }

        if (mStatusBarStateListener.getCurrentState() != SHADE) {
            // Bubbles don't appear over the locked shade.
            mStackView.setVisibility(INVISIBLE);
        } else if (hasBubbles()) {
            // If we're unlocked, show the stack if we have bubbles. If we don't have bubbles, the
            // stack will be set to INVISIBLE in onAllBubblesAnimatedOut after the bubbles animate
            // out.
            mStackView.setVisibility(VISIBLE);
        }

        mStackView.updateContentDescription();
    }

    /**
     * The display id of the expanded view, if the stack is expanded and not occluded by the
     * status bar, otherwise returns {@link Display#INVALID_DISPLAY}.
     */
    public int getExpandedDisplayId(Context context) {
        if (mStackView == null) {
            return INVALID_DISPLAY;
        }
        final boolean defaultDisplay = context.getDisplay() != null
                && context.getDisplay().getDisplayId() == DEFAULT_DISPLAY;
        final BubbleViewProvider expandedViewProvider = mStackView.getExpandedBubble();
        if (defaultDisplay && expandedViewProvider != null && isStackExpanded()
                && !mNotificationShadeWindowController.getPanelExpanded()) {
            return expandedViewProvider.getDisplayId();
        }
        return INVALID_DISPLAY;
    }

    @VisibleForTesting
    BubbleStackView getStackView() {
        return mStackView;
    }

    /**
     * Description of current bubble state.
     */
    public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
        pw.println("BubbleController state:");
        mBubbleData.dump(fd, pw, args);
        pw.println();
        if (mStackView != null) {
            mStackView.dump(fd, pw, args);
        }
        pw.println();
    }

    /**
     * This task stack listener is responsible for responding to tasks moved to the front
     * which are on the default (main) display. When this happens, expanded bubbles must be
     * collapsed so the user may interact with the app which was just moved to the front.
     * <p>
     * This listener is registered with SystemUI's ActivityManagerWrapper which dispatches
     * these calls via a main thread Handler.
     */
    @MainThread
    private class BubbleTaskStackListener extends TaskStackChangeListener {

        @Override
        public void onTaskMovedToFront(RunningTaskInfo taskInfo) {
            if (mStackView != null && taskInfo.displayId == Display.DEFAULT_DISPLAY) {
                if (!mStackView.isExpansionAnimating()) {
                    mBubbleData.setExpanded(false);
                }
            }
        }

        @Override
        public void onActivityRestartAttempt(RunningTaskInfo task, boolean homeTaskVisible,
                boolean clearedTask, boolean wasVisible) {
            for (Bubble b : mBubbleData.getBubbles()) {
                if (b.getDisplayId() == task.displayId) {
                    mBubbleData.setSelectedBubble(b);
                    mBubbleData.setExpanded(true);
                    return;
                }
            }
        }

        @Override
        public void onActivityLaunchOnSecondaryDisplayRerouted() {
            if (mStackView != null) {
                mBubbleData.setExpanded(false);
            }
        }

        @Override
        public void onBackPressedOnTaskRoot(RunningTaskInfo taskInfo) {
            if (mStackView != null && taskInfo.displayId == getExpandedDisplayId(mContext)) {
                mBubbleData.setExpanded(false);
            }
        }

        @Override
        public void onSingleTaskDisplayDrawn(int displayId) {
            if (mStackView == null) {
                return;
            }
            mStackView.showExpandedViewContents(displayId);
        }

        @Override
        public void onSingleTaskDisplayEmpty(int displayId) {
            final BubbleViewProvider expandedBubble = mStackView != null
                    ? mStackView.getExpandedBubble()
                    : null;
            int expandedId = expandedBubble != null ? expandedBubble.getDisplayId() : -1;
            if (mStackView != null && mStackView.isExpanded() && expandedId == displayId) {
                mBubbleData.setExpanded(false);
            }
            mBubbleData.notifyDisplayEmpty(displayId);
        }
    }

    /**
     * Whether an intent is properly configured to display in an {@link android.app.ActivityView}.
     *
     * Keep checks in sync with NotificationManagerService#canLaunchInActivityView. Typically
     * that should filter out any invalid bubbles, but should protect SysUI side just in case.
     *
     * @param context the context to use.
     * @param entry the entry to bubble.
     */
    static boolean canLaunchInActivityView(Context context, NotificationEntry entry) {
        PendingIntent intent = entry.getBubbleMetadata() != null
                ? entry.getBubbleMetadata().getIntent()
                : null;
        if (entry.getBubbleMetadata() != null
                && entry.getBubbleMetadata().getShortcutId() != null) {
            return true;
        }
        if (intent == null) {
            Log.w(TAG, "Unable to create bubble -- no intent: " + entry.getKey());
            return false;
        }
        PackageManager packageManager = StatusBar.getPackageManagerForUser(
                context, entry.getSbn().getUser().getIdentifier());
        ActivityInfo info =
                intent.getIntent().resolveActivityInfo(packageManager, 0);
        if (info == null) {
            Log.w(TAG, "Unable to send as bubble, "
                    + entry.getKey() + " couldn't find activity info for intent: "
                    + intent);
            return false;
        }
        if (!ActivityInfo.isResizeableMode(info.resizeMode)) {
            Log.w(TAG, "Unable to send as bubble, "
                    + entry.getKey() + " activity is not resizable for intent: "
                    + intent);
            return false;
        }
        return true;
    }

    /** PinnedStackListener that dispatches IME visibility updates to the stack. */
    private class BubblesImeListener extends PinnedStackListenerForwarder.PinnedStackListener {
        @Override
        public void onImeVisibilityChanged(boolean imeVisible, int imeHeight) {
            if (mStackView != null) {
                mStackView.post(() -> mStackView.onImeVisibilityChanged(imeVisible, imeHeight));
            }
        }
    }
}