com/android/egg/neko/NekoService.java

/*
 * 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.egg.neko;

import static com.android.egg.neko.Cat.PURR;
import static com.android.egg.neko.NekoLand.CHAN_ID;

import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.job.JobInfo;
import android.app.job.JobParameters;
import android.app.job.JobScheduler;
import android.app.job.JobService;
import android.content.ComponentName;
import android.content.Context;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;

import com.android.egg.R;

import java.util.List;
import java.util.Random;

public class NekoService extends JobService {

    private static final String TAG = "NekoService";

    public static int JOB_ID = 42;

    public static int CAT_NOTIFICATION = 1;
    public static int DEBUG_NOTIFICATION = 1234;

    public static float CAT_CAPTURE_PROB = 1.0f; // generous

    public static long SECONDS = 1000;
    public static long MINUTES = 60 * SECONDS;

    //public static long INTERVAL_FLEX = 15 * SECONDS;
    public static long INTERVAL_FLEX = 5 * MINUTES;

    public static float INTERVAL_JITTER_FRAC = 0.25f;

    private static void setupNotificationChannels(Context context) {
        NotificationManager noman = context.getSystemService(NotificationManager.class);
        NotificationChannel eggChan = new NotificationChannel(CHAN_ID,
                context.getString(R.string.notification_channel_name),
                NotificationManager.IMPORTANCE_DEFAULT);
        eggChan.setSound(Uri.EMPTY, Notification.AUDIO_ATTRIBUTES_DEFAULT); // cats are quiet
        eggChan.setVibrationPattern(PURR); // not totally quiet though
        //eggChan.setBlockableSystem(true); // unlike a real cat, you can push this one off your lap
        eggChan.setLockscreenVisibility(Notification.VISIBILITY_PUBLIC); // cats sit in the window
        noman.createNotificationChannel(eggChan);
    }

    @Override
    public boolean onStartJob(JobParameters params) {
        Log.v(TAG, "Starting job: " + String.valueOf(params));

        if (NekoLand.DEBUG_NOTIFICATIONS) {
            NotificationManager noman = getSystemService(NotificationManager.class);
            final Bundle extras = new Bundle();
            extras.putString("android.substName", getString(R.string.notification_name));
            final int size = getResources()
                    .getDimensionPixelSize(android.R.dimen.notification_large_icon_width);
            final Cat cat = Cat.create(this);
            final Notification.Builder builder
                    = cat.buildNotification(this)
                    .setContentTitle("DEBUG")
                    .setChannelId(NekoLand.CHAN_ID)
                    .setContentText("Ran job: " + params);

            noman.notify(DEBUG_NOTIFICATION, builder.build());
        }

        triggerFoodResponse(this);
        cancelJob(this);
        return false;
    }

    private static void triggerFoodResponse(Context context) {
        final PrefState prefs = new PrefState(context);
        int food = prefs.getFoodState();
        if (food != 0) {
            prefs.setFoodState(0); // nom
            final Random rng = new Random();
            if (rng.nextFloat() <= CAT_CAPTURE_PROB) {
                Cat cat;
                List<Cat> cats = prefs.getCats();
                final int[] probs = context.getResources().getIntArray(R.array.food_new_cat_prob);
                final float waterLevel100 = prefs.getWaterState() / 2; // water is 0..200
                final float new_cat_prob = (float) ((food < probs.length)
                        ? probs[food]
                        : waterLevel100) / 100f;
                Log.v(TAG, "Food type: " + food);
                Log.v(TAG, "New cat probability: " + new_cat_prob);

                if (cats.size() == 0 || rng.nextFloat() <= new_cat_prob) {
                    cat = newRandomCat(context, prefs);
                    Log.v(TAG, "A new cat is here: " + cat.getName());
                } else {
                    cat = getExistingCat(prefs);
                    Log.v(TAG, "A cat has returned: " + cat.getName());
                }

                notifyCat(context, cat);
            }
        }
    }

    static void notifyCat(Context context, Cat cat) {
        NotificationManager noman = context.getSystemService(NotificationManager.class);
        final Notification.Builder builder = cat.buildNotification(context);
        noman.notify(cat.getShortcutId(), CAT_NOTIFICATION, builder.build());
    }

    static Cat newRandomCat(Context context, PrefState prefs) {
        final Cat cat = Cat.create(context);
        prefs.addCat(cat);
        cat.logAdd(context);
        return cat;
    }

    static Cat getExistingCat(PrefState prefs) {
        final List<Cat> cats = prefs.getCats();
        if (cats.size() == 0) return null;
        return cats.get(new Random().nextInt(cats.size()));
    }

    @Override
    public boolean onStopJob(JobParameters jobParameters) {
        return false;
    }

    public static void registerJobIfNeeded(Context context, long intervalMinutes) {
        JobScheduler jss = context.getSystemService(JobScheduler.class);
        JobInfo info = jss.getPendingJob(JOB_ID);
        if (info == null) {
            registerJob(context, intervalMinutes);
        }
    }

    public static void registerJob(Context context, long intervalMinutes) {
        setupNotificationChannels(context);

        JobScheduler jss = context.getSystemService(JobScheduler.class);
        jss.cancel(JOB_ID);
        long interval = intervalMinutes * MINUTES;
        long jitter = (long) (INTERVAL_JITTER_FRAC * interval);
        interval += (long) (Math.random() * (2 * jitter)) - jitter;
        final JobInfo jobInfo = new JobInfo.Builder(JOB_ID,
                new ComponentName(context, NekoService.class))
                .setPeriodic(interval, INTERVAL_FLEX)
                .build();

        Log.v(TAG, "A cat will visit in " + interval + "ms: " + String.valueOf(jobInfo));
        jss.schedule(jobInfo);

        if (NekoLand.DEBUG_NOTIFICATIONS) {
            NotificationManager noman = context.getSystemService(NotificationManager.class);
            noman.notify(DEBUG_NOTIFICATION, new Notification.Builder(context)
                    .setSmallIcon(R.drawable.stat_icon)
                    .setContentTitle(String.format("Job scheduled in %d min", (interval / MINUTES)))
                    .setContentText(String.valueOf(jobInfo))
                    .setPriority(Notification.PRIORITY_MIN)
                    .setCategory(Notification.CATEGORY_SERVICE)
                    .setChannelId(NekoLand.CHAN_ID)
                    .setShowWhen(true)
                    .build());
        }
    }

    public static void cancelJob(Context context) {
        JobScheduler jss = context.getSystemService(JobScheduler.class);
        Log.v(TAG, "Canceling job");
        jss.cancel(JOB_ID);
    }
}