/*
 * Copyright (C) 2017 Google Inc. All Rights Reserved.
 *
 * 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.example.android.wearable.wear.wearaccessibilityapp;

import android.app.IntentService;
import android.app.Notification;
import android.app.PendingIntent;
import android.content.Intent;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.util.Log;

import androidx.core.app.NotificationCompat;
import androidx.core.app.NotificationCompat.MessagingStyle;
import androidx.core.app.NotificationManagerCompat;
import androidx.core.app.Person;
import androidx.core.app.RemoteInput;
import androidx.core.content.ContextCompat;

/**
 * Asynchronously handles updating messaging app posts (and active Notification) with replies from
 * user in a conversation. Notification for social app use MessagingStyle.
 */
public class MessagingIntentService extends IntentService {

    private static final String TAG = "MessagingIntentService";

    public static final String ACTION_REPLY =
            "com.example.android.wearable.wear.wearnotifications.handlers.action.REPLY";

    public static final String EXTRA_REPLY =
            "com.example.android.wearable.wear.wearnotifications.handlers.extra.REPLY";

    public MessagingIntentService() {
        super("MessagingIntentService");
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        Log.d(TAG, "onHandleIntent(): " + intent);

        if (intent != null) {
            final String action = intent.getAction();
            if (ACTION_REPLY.equals(action)) {
                handleActionReply(getMessage(intent));
            }
        }
    }

    /** Handles action for replying to messages from the notification. */
    private void handleActionReply(CharSequence replyCharSequence) {
        Log.d(TAG, "handleActionReply(): " + replyCharSequence);

        if (replyCharSequence != null) {

            // TODO: Asynchronously save your message to Database and servers.

            /*
             * You have two options for updating your notification (this class uses approach #2):
             *
             *  1. Use a new NotificationCompatBuilder to create the Notification. This approach
             *  requires you to get *ALL* the information that existed in the previous
             *  Notification (and updates) and pass it to the builder. This is the approach used in
             *  the MainActivity.
             *
             *  2. Use the original NotificationCompatBuilder to create the Notification. This
             *  approach requires you to store a reference to the original builder. The benefit is
             *  you only need the new/updated information. In our case, the reply from the user
             *  which we already have here.
             *
             *  IMPORTANT NOTE: You shouldn't save/modify the resulting Notification object using
             *  its member variables and/or legacy APIs. If you want to retain anything from update
             *  to update, retain the Builder as option 2 outlines.
             */

            // Retrieves NotificationCompat.Builder used to create initial Notification
            NotificationCompat.Builder notificationCompatBuilder =
                    GlobalNotificationBuilder.getNotificationCompatBuilderInstance();

            // Recreate builder from persistent state if app process is killed
            if (notificationCompatBuilder == null) {
                // Note: New builder set globally in the method
                notificationCompatBuilder = recreateBuilderWithMessagingStyle();
            }

            // Since we are adding to the MessagingStyle, we need to first retrieve the
            // current MessagingStyle from the Notification itself.
            Notification notification = notificationCompatBuilder.build();
            MessagingStyle messagingStyle =
                    NotificationCompat.MessagingStyle.extractMessagingStyleFromNotification(
                            notification);

            // Add new message to the MessagingStyle. Set last parameter to null for responses
            // from user.
            messagingStyle.addMessage(replyCharSequence, System.currentTimeMillis(), (Person) null);

            // Updates the Notification
            notification = notificationCompatBuilder.setStyle(messagingStyle).build();

            // Pushes out the updated Notification
            NotificationManagerCompat notificationManagerCompat =
                    NotificationManagerCompat.from(getApplicationContext());
            notificationManagerCompat.notify(NotificationsActivity.NOTIFICATION_ID, notification);
        }
    }

    /*
     * Extracts CharSequence created from the RemoteInput associated with the Notification.
     */
    private CharSequence getMessage(Intent intent) {
        Bundle remoteInput = RemoteInput.getResultsFromIntent(intent);
        if (remoteInput != null) {
            return remoteInput.getCharSequence(EXTRA_REPLY);
        }
        return null;
    }

    /*
     * This recreates the notification from the persistent state in case the app process was killed.
     * It is basically the same code for creating the Notification from MainActivity.
     */
    private NotificationCompat.Builder recreateBuilderWithMessagingStyle() {

        // Main steps for building a MESSAGING_STYLE notification:
        //      0. Get your data
        //      1. Create Notification Channel for O and beyond devices (26+)
        //      2. Build the MESSAGING_STYLE
        //      3. Set up main Intent for notification
        //      4. Set up RemoteInput (users can input directly from notification)
        //      5. Build and issue the notification

        // 0. Get your data (everything unique per Notification).
        MockDatabase.MessagingStyleCommsAppData messagingStyleCommsAppData =
                MockDatabase.getMessagingStyleData(getApplicationContext());

        // 1. Retrieve Notification Channel for O and beyond devices (26+). We don't need to create
        //    the NotificationChannel, since it was created the first time this Notification was
        //    created.
        String notificationChannelId = messagingStyleCommsAppData.getChannelId();

        // 2. Build the Notification.Style (MESSAGING_STYLE).
        String contentTitle = messagingStyleCommsAppData.getContentTitle();

        MessagingStyle messagingStyle =
                new NotificationCompat.MessagingStyle(messagingStyleCommsAppData.getMe())
                        /*
                         * <p>This API's behavior was changed in SDK version
                         * {@link Build.VERSION_CODES#P}. If your application's target version is
                         * less than {@link Build.VERSION_CODES#P}, setting a conversation title to
                         * a non-null value will make {@link #isGroupConversation()} return
                         * {@code true} and passing {@code null} will make it return {@code false}.
                         * This behavior can be overridden by calling
                         * {@link #setGroupConversation(boolean)} regardless of SDK version.
                         * In {@code P} and above, this method does not affect group conversation
                         * settings.
                         *
                         * In our case, we use the same title.
                         */
                        .setConversationTitle(contentTitle);

        // Adds all Messages.
        // Note: Messages include the text, timestamp, and sender.
        for (MessagingStyle.Message message : messagingStyleCommsAppData.getMessages()) {
            messagingStyle.addMessage(message);
        }

        messagingStyle.setGroupConversation(messagingStyleCommsAppData.isGroupConversation());

        // 3. Set up main Intent for notification.
        Intent notifyIntent = new Intent(this, MessagingMainActivity.class);

        PendingIntent mainPendingIntent =
                PendingIntent.getActivity(this, 0, notifyIntent, PendingIntent.FLAG_UPDATE_CURRENT);

        // 4. Set up a RemoteInput Action, so users can input (keyboard, drawing, voice) directly
        // from the notification without entering the app.

        // Create the RemoteInput specifying this key.
        String replyLabel = getString(R.string.reply_label);
        RemoteInput remoteInput =
                new RemoteInput.Builder(MessagingIntentService.EXTRA_REPLY)
                        .setLabel(replyLabel)
                        // Use machine learning to create responses based on previous messages.
                        .setChoices(messagingStyleCommsAppData.getReplyChoicesBasedOnLastMessage())
                        .build();

        // Create PendingIntent for service that handles input.
        Intent replyIntent = new Intent(this, MessagingIntentService.class);
        replyIntent.setAction(MessagingIntentService.ACTION_REPLY);
        PendingIntent replyActionPendingIntent = PendingIntent.getService(this, 0, replyIntent, 0);

        // Enable action to appear inline on Wear 2.0 (24+). This means it will appear over the
        // lower portion of the Notification for easy action (only possible for one action).
        final NotificationCompat.Action.WearableExtender inlineActionForWear2 =
                new NotificationCompat.Action.WearableExtender()
                        .setHintDisplayActionInline(true)
                        .setHintLaunchesActivity(false);

        NotificationCompat.Action replyAction =
                new NotificationCompat.Action.Builder(
                        R.drawable.reply,
                        replyLabel,
                        replyActionPendingIntent)
                        .addRemoteInput(remoteInput)
                        // Informs system we aren't bringing up our own custom UI for a reply
                        // action.
                        .setShowsUserInterface(false)
                        // Allows system to generate replies by context of conversation.
                        .setAllowGeneratedReplies(true)
                        // Add WearableExtender to enable inline actions.
                        .setSemanticAction(NotificationCompat.Action.SEMANTIC_ACTION_REPLY)
                        .extend(inlineActionForWear2)
                        .build();

        // 5. Build and issue the notification.

        // Notification Channel Id is ignored for Android pre O (26).
        NotificationCompat.Builder notificationCompatBuilder =
                new NotificationCompat.Builder(getApplicationContext(), notificationChannelId);

        GlobalNotificationBuilder.setNotificationCompatBuilderInstance(notificationCompatBuilder);

        notificationCompatBuilder
                // MESSAGING_STYLE sets title and content for Wear 1.+ and Wear 2.0 devices.
                .setStyle(messagingStyle)
                .setContentTitle(contentTitle)
                .setContentText(messagingStyleCommsAppData.getContentText())
                .setSmallIcon(R.drawable.watch)
                .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.avatar))
                .setContentIntent(mainPendingIntent)
                .setDefaults(NotificationCompat.DEFAULT_ALL)
                // Set primary color (important for Wear 2.0 Notifications).
                .setColor(ContextCompat.getColor(getApplicationContext(), R.color.background))

                // Number of new notifications for API <24 (Wear 1.+) devices.
                .setSubText(Integer.toString(messagingStyleCommsAppData.getNumberOfNewMessages()))
                .addAction(replyAction)
                .setCategory(Notification.CATEGORY_MESSAGE)

                // Sets priority for 25 and below. For 26 and above, 'priority' is deprecated for
                // 'importance' which is set in the NotificationChannel. The integers representing
                // 'priority' are different from 'importance', so make sure you don't mix them.
                .setPriority(messagingStyleCommsAppData.getPriority())

                // Sets lock-screen visibility for 25 and below. For 26 and above, lock screen
                // visibility is set in the NotificationChannel.
                .setVisibility(messagingStyleCommsAppData.getChannelLockscreenVisibility());

        // If the phone is in "Do not disturb" mode, the user may still be notified if the
        // sender(s) are in a group allowed through "Do not disturb" by the user.
        for (Person person : messagingStyleCommsAppData.getParticipants()) {
            notificationCompatBuilder.addPerson(person.getUri());
        }
        return notificationCompatBuilder;
    }
}