/*
 * 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.launcher3.util;

import android.content.SharedPreferences;
import android.util.ArrayMap;

import androidx.annotation.StringDef;

import com.android.launcher3.views.ActivityContext;

import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.util.Collections;
import java.util.Map;

/**
 * Stores and retrieves onboarding-related data via SharedPreferences.
 *
 * @param <T> Context which owns these preferences.
 */
public class OnboardingPrefs<T extends ActivityContext> {

    public static final String HOME_BOUNCE_SEEN = "launcher.apps_view_shown";
    public static final String HOME_BOUNCE_COUNT = "launcher.home_bounce_count";
    public static final String HOTSEAT_DISCOVERY_TIP_COUNT = "launcher.hotseat_discovery_tip_count";
    public static final String HOTSEAT_LONGPRESS_TIP_SEEN = "launcher.hotseat_longpress_tip_seen";
    public static final String ALL_APPS_VISITED_COUNT = "launcher.all_apps_visited_count";
    public static final String TASKBAR_EDU_TOOLTIP_STEP = "launcher.taskbar_edu_tooltip_step";
    // When adding a new key, add it here as well, to be able to reset it from Developer Options.
    public static final Map<String, String[]> ALL_PREF_KEYS = Map.of(
            "All Apps Bounce", new String[] { HOME_BOUNCE_SEEN, HOME_BOUNCE_COUNT },
            "Hybrid Hotseat Education", new String[] { HOTSEAT_DISCOVERY_TIP_COUNT,
                    HOTSEAT_LONGPRESS_TIP_SEEN },
            "Taskbar Education", new String[] { TASKBAR_EDU_TOOLTIP_STEP },
            "All Apps Visited Count", new String[] {ALL_APPS_VISITED_COUNT}
    );

    /**
     * Events that either have happened or have not (booleans).
     */
    @StringDef(value = {
            HOME_BOUNCE_SEEN,
            HOTSEAT_LONGPRESS_TIP_SEEN,
    })
    @Retention(RetentionPolicy.SOURCE)
    public @interface EventBoolKey {}

    /**
     * Events that occur multiple times, which we count up to a max defined in {@link #MAX_COUNTS}.
     */
    @StringDef(value = {
            HOME_BOUNCE_COUNT,
            HOTSEAT_DISCOVERY_TIP_COUNT,
            ALL_APPS_VISITED_COUNT,
            TASKBAR_EDU_TOOLTIP_STEP,
    })
    @Retention(RetentionPolicy.SOURCE)
    public @interface EventCountKey {}

    private static final Map<String, Integer> MAX_COUNTS;

    static {
        Map<String, Integer> maxCounts = new ArrayMap<>(5);
        maxCounts.put(HOME_BOUNCE_COUNT, 3);
        maxCounts.put(HOTSEAT_DISCOVERY_TIP_COUNT, 5);
        maxCounts.put(ALL_APPS_VISITED_COUNT, 20);
        maxCounts.put(TASKBAR_EDU_TOOLTIP_STEP, 2);
        MAX_COUNTS = Collections.unmodifiableMap(maxCounts);
    }

    protected final T mLauncher;
    protected final SharedPreferences mSharedPrefs;

    public OnboardingPrefs(T launcher, SharedPreferences sharedPrefs) {
        mLauncher = launcher;
        mSharedPrefs = sharedPrefs;
    }

    /** @return The number of times we have seen the given event. */
    public int getCount(@EventCountKey String key) {
        return mSharedPrefs.getInt(key, 0);
    }

    /** @return Whether we have seen this event enough times, as defined by {@link #MAX_COUNTS}. */
    public boolean hasReachedMaxCount(@EventCountKey String eventKey) {
        return hasReachedMaxCount(getCount(eventKey), eventKey);
    }

    private boolean hasReachedMaxCount(int count, @EventCountKey String eventKey) {
        return count >= MAX_COUNTS.get(eventKey);
    }

    /** @return Whether we have seen the given event. */
    public boolean getBoolean(@EventBoolKey String key) {
        return mSharedPrefs.getBoolean(key, false);
    }

    /**
     * Marks on-boarding preference boolean at true
     */
    public void markChecked(String flag) {
        mSharedPrefs.edit().putBoolean(flag, true).apply();
    }

    /**
     * Add 1 to the given event count, if we haven't already reached the max count.
     *
     * @return Whether we have now reached the max count.
     */
    public boolean incrementEventCount(@EventCountKey String eventKey) {
        int count = getCount(eventKey);
        if (hasReachedMaxCount(count, eventKey)) {
            return true;
        }
        count++;
        mSharedPrefs.edit().putInt(eventKey, count).apply();
        return hasReachedMaxCount(count, eventKey);
    }

    /**
     * Sets the event count to the given value.
     *
     * @return Whether we have now reached the max count.
     */
    public boolean setEventCount(int count, @EventCountKey String eventKey) {
        mSharedPrefs.edit().putInt(eventKey, count).apply();
        return hasReachedMaxCount(count, eventKey);
    }
}