/*
 * Copyright (C) 2020 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.statusbar.notification.collection.coordinator;

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.coordinator.dagger.CoordinatorScope;
import com.android.systemui.statusbar.notification.collection.listbuilder.pluggable.NotifFilter;
import com.android.systemui.statusbar.notification.collection.notifcollection.DismissedByUserStats;
import com.android.systemui.statusbar.notification.collection.notifcollection.NotifDismissInterceptor;
import com.android.systemui.wmshell.BubblesManager;
import com.android.wm.shell.bubbles.BubbleController;
import com.android.wm.shell.bubbles.Bubbles;

import java.util.HashSet;
import java.util.Optional;
import java.util.Set;

import javax.inject.Inject;

/**
 * Coordinates hiding, intercepting (the dismissal), and deletion of bubbled notifications.
 *
 * The typical "start state" for a bubbled notification is when a bubble-able notification is
 * posted. It is visible as a bubble AND as a notification in the shade. From here, we can get
 * into a few hidden-from-shade states described below:
 *
 * Start State -> Hidden from shade
 * User expands the bubble so we hide its notification from the shade.
 * OR
 * User dismisses a group summary with a bubbled child. All bubbled children are now hidden from
 * the shade. And the group summary's dismissal is intercepted + hidden from the shade (see below).
 *
 * Start State -> Dismissal intercepted + hidden from shade
 * User dismisses the notification from the shade. We now hide the notification from the shade
 * and intercept its dismissal (the removal signal is never sent to system server). We
 * keep the notification alive in system server so that {@link BubbleController} can still
 * respond to app-cancellations (ie: remove the bubble if the app cancels the notification).
 *
 */
@CoordinatorScope
public class BubbleCoordinator implements Coordinator {
    private static final String TAG = "BubbleCoordinator";

    private final Optional<BubblesManager> mBubblesManagerOptional;
    private final Optional<Bubbles> mBubblesOptional;
    private final NotifCollection mNotifCollection;
    private final Set<String> mInterceptedDismissalEntries = new HashSet<>();
    private NotifPipeline mNotifPipeline;
    private NotifDismissInterceptor.OnEndDismissInterception mOnEndDismissInterception;

    @Inject
    public BubbleCoordinator(
            Optional<BubblesManager> bubblesManagerOptional,
            Optional<Bubbles> bubblesOptional,
            NotifCollection notifCollection) {
        mBubblesManagerOptional = bubblesManagerOptional;
        mBubblesOptional = bubblesOptional;
        mNotifCollection = notifCollection;
    }

    @Override
    public void attach(NotifPipeline pipeline) {
        mNotifPipeline = pipeline;
        mNotifPipeline.addNotificationDismissInterceptor(mDismissInterceptor);
        mNotifPipeline.addPreGroupFilter(mNotifFilter);
        mBubblesManagerOptional.ifPresent(manager -> manager.addNotifCallback(mNotifCallback));
    }

    private final NotifFilter mNotifFilter = new NotifFilter(TAG) {
        @Override
        public boolean shouldFilterOut(NotificationEntry entry, long now) {
            return mBubblesOptional.isPresent()
                    && mBubblesOptional.get().isBubbleNotificationSuppressedFromShade(
                            entry.getKey(), entry.getSbn().getGroupKey());
        }
    };

    private final NotifDismissInterceptor mDismissInterceptor = new NotifDismissInterceptor() {
        @Override
        public String getName() {
            return TAG;
        }

        @Override
        public void setCallback(OnEndDismissInterception callback) {
            mOnEndDismissInterception = callback;
        }

        @Override
        public boolean shouldInterceptDismissal(NotificationEntry entry) {
            if (mBubblesManagerOptional.isPresent()
                    && mBubblesManagerOptional.get().handleDismissalInterception(entry)) {
                mInterceptedDismissalEntries.add(entry.getKey());
                return true;
            } else {
                mInterceptedDismissalEntries.remove(entry.getKey());
                return false;
            }
        }

        @Override
        public void cancelDismissInterception(NotificationEntry entry) {
            mInterceptedDismissalEntries.remove(entry.getKey());
        }
    };

    private final BubblesManager.NotifCallback mNotifCallback = new BubblesManager.NotifCallback() {
        @Override
        public void removeNotification(
                NotificationEntry entry,
                DismissedByUserStats dismissedByUserStats,
                int reason
        ) {
            if (!mNotifPipeline.isNewPipelineEnabled()) {
                // The `entry` will be from whichever pipeline is active, so if the old pipeline is
                // running, make sure that we use the new pipeline's entry (if it still exists).
                NotificationEntry newPipelineEntry = mNotifPipeline.getEntry(entry.getKey());
                if (newPipelineEntry != null) {
                    entry = newPipelineEntry;
                }
            }
            if (isInterceptingDismissal(entry)) {
                mInterceptedDismissalEntries.remove(entry.getKey());
                mOnEndDismissInterception.onEndDismissInterception(mDismissInterceptor, entry,
                        dismissedByUserStats);
            } else if (mNotifPipeline.getEntry(entry.getKey()) != null) {
                // Bubbles are hiding the notifications from the shade, but the bubble was
                // deleted; therefore, the notification should be cancelled as if it were a user
                // dismissal (this won't re-enter handleInterceptDimissal because Bubbles
                // will have already marked it as no longer a bubble)
                mNotifCollection.dismissNotification(entry, dismissedByUserStats);
            }
        }

        @Override
        public void invalidateNotifications(String reason) {
            mNotifFilter.invalidateList();
        }

        @Override
        public void maybeCancelSummary(NotificationEntry entry) {
            // no-op
        }
    };

    private boolean isInterceptingDismissal(NotificationEntry entry) {
        return mInterceptedDismissalEntries.contains(entry.getKey());
    }
}