/*
 * Copyright (C) 2021 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.car.settings.applications;

import android.app.usage.UsageStats;
import android.car.drivingstate.CarUxRestrictions;
import android.content.Context;

import androidx.preference.Preference;

import com.android.car.settings.R;
import com.android.car.settings.common.FragmentController;
import com.android.car.settings.common.PreferenceController;

import java.util.List;

/**
 * Controller that shows when there is no recently used apps.
 * Sets availability based on if there are recent apps and sets summary depending on number of
 * non-system apps.
 */
public class AllAppsPreferenceController extends PreferenceController<Preference> implements
        RecentAppsItemManager.RecentAppStatsListener,
        InstalledAppCountItemManager.InstalledAppCountListener {

    // In most cases, device has recently opened apps. So, assume true by default.
    private boolean mAreThereRecentlyUsedApps = true;

    public AllAppsPreferenceController(Context context, String preferenceKey,
            FragmentController fragmentController, CarUxRestrictions uxRestrictions) {
        super(context, preferenceKey, fragmentController, uxRestrictions);
    }

    @Override
    protected Class<Preference> getPreferenceType() {
        return Preference.class;
    }

    @Override
    public int getAvailabilityStatus() {
        return mAreThereRecentlyUsedApps ? CONDITIONALLY_UNAVAILABLE : AVAILABLE;
    }

    @Override
    public void onRecentAppStatsLoaded(List<UsageStats> recentAppStats) {
        mAreThereRecentlyUsedApps = !recentAppStats.isEmpty();
        refreshUi();
    }

    @Override
    public void onInstalledAppCountLoaded(int appCount) {
        getPreference().setSummary(getContext().getResources().getString(
                R.string.apps_view_all_apps_title, appCount));
    }
}