/*
 * Copyright (c) 2020, The Linux Foundation. All rights reserved
 * Not a contribution
 *
 * Copyright (C) 2019 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.settings.development;

import static androidx.lifecycle.Lifecycle.Event.ON_PAUSE;
import static androidx.lifecycle.Lifecycle.Event.ON_RESUME;

import android.content.Context;
import android.content.Intent;
import android.os.UserManager;
import android.telephony.SubscriptionInfo;
import android.telephony.SubscriptionManager;
import android.telephony.euicc.EuiccManager;

import androidx.lifecycle.Lifecycle;
import androidx.lifecycle.LifecycleObserver;
import androidx.lifecycle.OnLifecycleEvent;
import androidx.preference.Preference;
import androidx.preference.PreferenceScreen;

import com.android.settings.R;
import com.android.settings.core.PreferenceControllerMixin;
import com.android.settings.dashboard.DashboardFragment;
import com.android.settings.network.SubscriptionsChangeListener;
import com.android.settings.network.SubscriptionUtil;
import com.android.settings.network.telephony.MobileNetworkUtils;
import com.android.settings.overlay.FeatureFactory;
import com.android.settings.widget.AddPreference;
import com.android.settingslib.Utils;
import com.android.settingslib.core.AbstractPreferenceController;
import com.android.settingslib.core.instrumentation.MetricsFeatureProvider;

import java.util.List;

public class Prefer5GNetworkSummaryController extends AbstractPreferenceController implements
        SubscriptionsChangeListener.SubscriptionsChangeListenerClient, LifecycleObserver,
        PreferenceControllerMixin {
    private static final String TAG = "Prefer5GNetSummaryCtlr";

    private static final String KEY = "prefer_5G_nr_mode";

    private final MetricsFeatureProvider mMetricsFeatureProvider;

    private SubscriptionManager mSubscriptionManager;
    private UserManager mUserManager;
    private SubscriptionsChangeListener mChangeListener;
    private AddPreference mPreference;

    public Prefer5GNetworkSummaryController(Context context, Lifecycle lifecycle) {
        super(context);
        mMetricsFeatureProvider = FeatureFactory.getFactory(mContext).getMetricsFeatureProvider();
        mSubscriptionManager = context.getSystemService(SubscriptionManager.class);
        mUserManager = context.getSystemService(UserManager.class);
        if (lifecycle != null) {
          mChangeListener = new SubscriptionsChangeListener(context, this);
          lifecycle.addObserver(this);
        }
    }

    @OnLifecycleEvent(ON_RESUME)
    public void onResume() {
        mChangeListener.start();
        update();
    }

    @OnLifecycleEvent(ON_PAUSE)
    public void onPause() {
        mChangeListener.stop();
    }

    @Override
    public void displayPreference(PreferenceScreen screen) {
        super.displayPreference(screen);
        mPreference = screen.findPreference(getPreferenceKey());
    }

    @Override
    public CharSequence getSummary() {
        final List<SubscriptionInfo> subs = SubscriptionUtil.getAvailableSubscriptions(
                mContext);
        if (subs.isEmpty()) {
            if (MobileNetworkUtils.showEuiccSettings(mContext)) {
                return mContext.getResources().getString(
                        R.string.mobile_network_summary_add_a_network);
            }
            return null;
        } else {
            final int count = subs.size();
            return mContext.getResources().getQuantityString(R.plurals.mobile_network_summary_count,
                    count, count);
        }
    }

    private void startAddSimFlow() {
        final Intent intent = new Intent(EuiccManager.ACTION_PROVISION_EMBEDDED_SUBSCRIPTION);
        intent.putExtra(EuiccManager.EXTRA_FORCE_PROVISION, true);
        mContext.startActivity(intent);
    }

    private void update() {
        if (mPreference == null || mPreference.isDisabledByAdmin()) {
            return;
        }
        refreshSummary(mPreference);
        mPreference.setOnPreferenceClickListener(null);
        mPreference.setOnAddClickListener(null);
        mPreference.setFragment(null);
        mPreference.setEnabled(!mChangeListener.isAirplaneModeOn());

        final List<SubscriptionInfo> subs = SubscriptionUtil.getAvailableSubscriptions(
                mContext);

        if (subs.isEmpty()) {
            if (MobileNetworkUtils.showEuiccSettings(mContext)) {
                mPreference.setOnPreferenceClickListener((Preference pref) -> {
                    mMetricsFeatureProvider.logClickedPreference(pref,
                            pref.getExtras().getInt(DashboardFragment.CATEGORY));
                    startAddSimFlow();
                    return true;
                });
            } else {
                mPreference.setEnabled(false);
            }
        } else {
            // We have one or more existing subscriptions, so we want the plus button if eSIM is
            // supported.
            if (MobileNetworkUtils.showEuiccSettings(mContext)) {
                mPreference.setAddWidgetEnabled(!mChangeListener.isAirplaneModeOn());
                mPreference.setOnAddClickListener(p -> {
                    mMetricsFeatureProvider.logClickedPreference(p,
                            p.getExtras().getInt(DashboardFragment.CATEGORY));
                    startAddSimFlow();
                });
            }

            mPreference.setFragment(Prefer5GNetworkListFragment.class.getCanonicalName());
        }
    }

    @Override
    public boolean isAvailable() {
        return !Utils.isWifiOnly(mContext) && mUserManager.isAdminUser();
    }

    @Override
    public String getPreferenceKey() {
        return KEY;
    }

    @Override
    public void onAirplaneModeChanged(boolean airplaneModeEnabled) {
        update();
    }

    @Override
    public void onSubscriptionsChanged() {
        refreshSummary(mPreference);
        update();
    }
}