/*
 * 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.settings.wifi.details;

import static com.android.settings.network.NetworkProviderSettings.WIFI_DIALOG_ID;
import static com.android.settings.network.telephony.MobileNetworkUtils.NO_CELL_DATA_TYPE_ICON;
import static com.android.settingslib.Utils.formatPercentage;

import android.app.Dialog;
import android.app.admin.DevicePolicyManager;
import android.app.settings.SettingsEnums;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.net.ConnectivityManager;
import android.net.wifi.WifiManager;
import android.net.wifi.sharedconnectivity.app.HotspotNetwork;
import android.os.Bundle;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Looper;
import android.os.Process;
import android.os.SimpleClock;
import android.os.SystemClock;
import android.os.UserHandle;
import android.os.UserManager;
import android.telephony.SignalStrength;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;

import androidx.annotation.NonNull;
import androidx.annotation.VisibleForTesting;
import androidx.preference.Preference;
import androidx.preference.PreferenceScreen;

import com.android.settings.R;
import com.android.settings.Utils;
import com.android.settings.dashboard.RestrictedDashboardFragment;
import com.android.settings.network.telephony.MobileNetworkUtils;
import com.android.settings.overlay.FeatureFactory;
import com.android.settings.wifi.WifiConfigUiBase2;
import com.android.settings.wifi.WifiDialog2;
import com.android.settings.wifi.WifiUtils;
import com.android.settings.wifi.details2.AddDevicePreferenceController2;
import com.android.settings.wifi.details2.CertificateDetailsPreferenceController;
import com.android.settings.wifi.details2.ServerNamePreferenceController;
import com.android.settings.wifi.details2.WifiAutoConnectPreferenceController2;
import com.android.settings.wifi.details2.WifiDetailPreferenceController2;
import com.android.settings.wifi.details2.WifiMeteredPreferenceController2;
import com.android.settings.wifi.details2.WifiPrivacyPreferenceController;
import com.android.settings.wifi.details2.WifiPrivacyPreferenceController2;
import com.android.settings.wifi.details2.WifiSecondSummaryController2;
import com.android.settings.wifi.details2.WifiSubscriptionDetailPreferenceController2;
import com.android.settings.wifi.repository.SharedConnectivityRepository;
import com.android.settingslib.RestrictedLockUtils;
import com.android.settingslib.RestrictedLockUtils.EnforcedAdmin;
import com.android.settingslib.RestrictedLockUtilsInternal;
import com.android.settingslib.core.AbstractPreferenceController;
import com.android.wifitrackerlib.NetworkDetailsTracker;
import com.android.wifitrackerlib.WifiEntry;

import java.time.Clock;
import java.time.ZoneOffset;
import java.util.ArrayList;
import java.util.List;

/**
 * Detail page for the currently connected wifi network.
 *
 * <p>The key of {@link WifiEntry} should be saved to the intent Extras when launching this class
 * in order to properly render this page.
 */
public class WifiNetworkDetailsFragment extends RestrictedDashboardFragment implements
        WifiDialog2.WifiDialog2Listener {

    private static final String TAG = "WifiNetworkDetailsFrg";

    // Key of a Bundle to save/restore the selected WifiEntry
    public static final String KEY_CHOSEN_WIFIENTRY_KEY = "key_chosen_wifientry_key";

    public static final String KEY_HOTSPOT_DEVICE_CATEGORY = "hotspot_device_details_category";
    public static final String KEY_HOTSPOT_DEVICE_INTERNET_SOURCE =
            "hotspot_device_details_internet_source";
    public static final String KEY_HOTSPOT_DEVICE_BATTERY = "hotspot_device_details_battery";
    public static final String KEY_HOTSPOT_CONNECTION_CATEGORY = "hotspot_connection_category";

    // Max age of tracked WifiEntries
    private static final long MAX_SCAN_AGE_MILLIS = 15_000;
    // Interval between initiating SavedNetworkTracker scans
    private static final long SCAN_INTERVAL_MILLIS = 10_000;

    @VisibleForTesting
    boolean mIsUiRestricted;
    @VisibleForTesting
    NetworkDetailsTracker mNetworkDetailsTracker;
    private HandlerThread mWorkerThread;
    @VisibleForTesting
    WifiDetailPreferenceController2 mWifiDetailPreferenceController2;
    private List<WifiDialog2.WifiDialog2Listener> mWifiDialogListeners = new ArrayList<>();
    @VisibleForTesting
    List<AbstractPreferenceController> mControllers;
    private boolean mIsInstantHotspotFeatureEnabled =
            SharedConnectivityRepository.isDeviceConfigEnabled();
    @VisibleForTesting
    WifiNetworkDetailsViewModel mWifiNetworkDetailsViewModel;

    public WifiNetworkDetailsFragment() {
        super(UserManager.DISALLOW_CONFIG_WIFI);
    }

    @Override
    public void onAttach(@NonNull Context context) {
        super.onAttach(context);
        String wifiEntryKey = getArguments().getString(KEY_CHOSEN_WIFIENTRY_KEY);
        setupNetworksDetailTracker();
        use(WifiPrivacyPreferenceController.class)
                .setWifiEntryKey(wifiEntryKey);
        use(CertificateDetailsPreferenceController.class)
                .setWifiEntry(mNetworkDetailsTracker.getWifiEntry());
        use(ServerNamePreferenceController.class)
                .setWifiEntry(mNetworkDetailsTracker.getWifiEntry());
    }

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setIfOnlyAvailableForAdmins(true);
        mIsUiRestricted = isUiRestricted();
    }

    @Override
    public void onStart() {
        super.onStart();
        if (mIsUiRestricted) {
            restrictUi();
        }
    }

    @VisibleForTesting
    void restrictUi() {
        clearWifiEntryCallback();
        if (!isUiRestrictedByOnlyAdmin()) {
            getEmptyTextView().setText(R.string.wifi_empty_list_user_restricted);
        }
        getPreferenceScreen().removeAll();
    }

    @Override
    public void onDestroy() {
        mWorkerThread.quit();

        super.onDestroy();
    }

    @Override
    public int getMetricsCategory() {
        return SettingsEnums.WIFI_NETWORK_DETAILS;
    }

    @Override
    protected String getLogTag() {
        return TAG;
    }

    @Override
    protected int getPreferenceScreenResId() {
        return R.xml.wifi_network_details_fragment2;
    }

    @Override
    public int getDialogMetricsCategory(int dialogId) {
        if (dialogId == WIFI_DIALOG_ID) {
            return SettingsEnums.DIALOG_WIFI_AP_EDIT;
        }
        return 0;
    }

    @Override
    public Dialog onCreateDialog(int dialogId) {
        if (getActivity() == null || mWifiDetailPreferenceController2 == null) {
            return null;
        }

        final WifiEntry wifiEntry = mNetworkDetailsTracker.getWifiEntry();
        return new WifiDialog2(
                getActivity(),
                this,
                wifiEntry,
                WifiConfigUiBase2.MODE_MODIFY,
                0,
                false,
                true);
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        if (!mIsUiRestricted && isEditable()) {
            MenuItem item = menu.add(0, Menu.FIRST, 0, R.string.wifi_modify);
            item.setIcon(com.android.internal.R.drawable.ic_mode_edit);
            item.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
        }
        super.onCreateOptionsMenu(menu, inflater);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem menuItem) {
        switch (menuItem.getItemId()) {
            case Menu.FIRST:
                if (!mWifiDetailPreferenceController2.canModifyNetwork()) {
                    EnforcedAdmin admin = RestrictedLockUtilsInternal.getDeviceOwner(getContext());
                    if (admin == null) {
                        final DevicePolicyManager dpm = (DevicePolicyManager)
                                getContext().getSystemService(Context.DEVICE_POLICY_SERVICE);
                        final UserManager um = (UserManager)
                                getContext().getSystemService(Context.USER_SERVICE);
                        final int profileOwnerUserId = Utils.getManagedProfileId(
                                um, UserHandle.myUserId());
                        if (profileOwnerUserId != UserHandle.USER_NULL) {
                            admin = new EnforcedAdmin(dpm.getProfileOwnerAsUser(profileOwnerUserId),
                                    null, UserHandle.of(profileOwnerUserId));
                        }
                    }
                    RestrictedLockUtils.sendShowAdminSupportDetailsIntent(getContext(), admin);
                } else {
                    showDialog(WIFI_DIALOG_ID);
                }
                return true;
            default:
                return super.onOptionsItemSelected(menuItem);
        }
    }

    @Override
    protected List<AbstractPreferenceController> createPreferenceControllers(Context context) {
        mControllers = new ArrayList<>();
        final ConnectivityManager cm = context.getSystemService(ConnectivityManager.class);
        setupNetworksDetailTracker();
        final WifiEntry wifiEntry = mNetworkDetailsTracker.getWifiEntry();

        if (mIsInstantHotspotFeatureEnabled) {
            getWifiNetworkDetailsViewModel().setWifiEntry(wifiEntry);
        }

        final WifiSecondSummaryController2 wifiSecondSummaryController2 =
                new WifiSecondSummaryController2(context);
        wifiSecondSummaryController2.setWifiEntry(wifiEntry);
        mControllers.add(wifiSecondSummaryController2);

        mWifiDetailPreferenceController2 = WifiDetailPreferenceController2.newInstance(
                wifiEntry,
                cm,
                context,
                this,
                new Handler(Looper.getMainLooper()),  // UI thread.
                getSettingsLifecycle(),
                context.getSystemService(WifiManager.class),
                mMetricsFeatureProvider);
        mControllers.add(mWifiDetailPreferenceController2);

        final WifiAutoConnectPreferenceController2 wifiAutoConnectPreferenceController2 =
                new WifiAutoConnectPreferenceController2(context);
        wifiAutoConnectPreferenceController2.setWifiEntry(wifiEntry);
        mControllers.add(wifiAutoConnectPreferenceController2);

        final AddDevicePreferenceController2 addDevicePreferenceController2 =
                new AddDevicePreferenceController2(context);
        addDevicePreferenceController2.setWifiEntry(wifiEntry);
        mControllers.add(addDevicePreferenceController2);

        final WifiMeteredPreferenceController2 meteredPreferenceController2 =
                new WifiMeteredPreferenceController2(context, wifiEntry);
        mControllers.add(meteredPreferenceController2);

        final WifiPrivacyPreferenceController2 privacyController2 =
                new WifiPrivacyPreferenceController2(context);
        privacyController2.setWifiEntry(wifiEntry);
        mControllers.add(privacyController2);

        final WifiSubscriptionDetailPreferenceController2
                wifiSubscriptionDetailPreferenceController2 =
                new WifiSubscriptionDetailPreferenceController2(context);
        wifiSubscriptionDetailPreferenceController2.setWifiEntry(wifiEntry);
        mControllers.add(wifiSubscriptionDetailPreferenceController2);

        // Sets callback listener for wifi dialog.
        mWifiDialogListeners.add(mWifiDetailPreferenceController2);

        return mControllers;
    }

    @Override
    public void onSubmit(@NonNull WifiDialog2 dialog) {
        for (WifiDialog2.WifiDialog2Listener listener : mWifiDialogListeners) {
            listener.onSubmit(dialog);
        }
    }

    private void setupNetworksDetailTracker() {
        if (mNetworkDetailsTracker != null) {
            return;
        }

        final Context context = getContext();
        mWorkerThread = new HandlerThread(TAG
                + "{" + Integer.toHexString(System.identityHashCode(this)) + "}",
                Process.THREAD_PRIORITY_BACKGROUND);
        mWorkerThread.start();
        final Clock elapsedRealtimeClock = new SimpleClock(ZoneOffset.UTC) {
            @Override
            public long millis() {
                return SystemClock.elapsedRealtime();
            }
        };

        mNetworkDetailsTracker = FeatureFactory.getFeatureFactory()
                .getWifiTrackerLibProvider()
                .createNetworkDetailsTracker(
                        getSettingsLifecycle(),
                        context,
                        new Handler(Looper.getMainLooper()),
                        mWorkerThread.getThreadHandler(),
                        elapsedRealtimeClock,
                        MAX_SCAN_AGE_MILLIS,
                        SCAN_INTERVAL_MILLIS,
                        getArguments().getString(KEY_CHOSEN_WIFIENTRY_KEY));
    }

    private void clearWifiEntryCallback() {
        if (mNetworkDetailsTracker == null) {
            return;
        }
        final WifiEntry wifiEntry = mNetworkDetailsTracker.getWifiEntry();
        if (wifiEntry == null) {
            return;
        }
        wifiEntry.setListener(null);
    }

    private boolean isEditable() {
        if (mNetworkDetailsTracker == null) {
            return false;
        }
        final WifiEntry wifiEntry = mNetworkDetailsTracker.getWifiEntry();
        if (wifiEntry == null) {
            return false;
        }
        return wifiEntry.isSaved();
    }

    /**
     * API call for refreshing the preferences in this fragment.
     */
    public void refreshPreferences() {
        updatePreferenceStates();
        displayPreferenceControllers();
    }

    protected void displayPreferenceControllers() {
        final PreferenceScreen screen = getPreferenceScreen();
        for (AbstractPreferenceController controller : mControllers) {
            // WifiDetailPreferenceController2 gets the callback WifiEntryCallback#onUpdated,
            // it can control the visibility change by itself.
            // And WifiDetailPreferenceController2#updatePreference renew mEntityHeaderController
            // instance which will cause icon reset.
            if (controller instanceof WifiDetailPreferenceController2) {
                continue;
            }
            controller.displayPreference(screen);
        }
        if (mIsInstantHotspotFeatureEnabled) {
            getWifiNetworkDetailsViewModel().setWifiEntry(mNetworkDetailsTracker.getWifiEntry());
        }
    }

    private WifiNetworkDetailsViewModel getWifiNetworkDetailsViewModel() {
        if (mWifiNetworkDetailsViewModel == null) {
            mWifiNetworkDetailsViewModel = FeatureFactory.getFeatureFactory()
                    .getWifiFeatureProvider().getWifiNetworkDetailsViewModel(this);
            mWifiNetworkDetailsViewModel.getHotspotNetworkData()
                    .observe(this, this::onHotspotNetworkChanged);
        }
        return mWifiNetworkDetailsViewModel;
    }

    @VisibleForTesting
    void onHotspotNetworkChanged(WifiNetworkDetailsViewModel.HotspotNetworkData data) {
        PreferenceScreen screen = getPreferenceScreen();
        if (screen == null) {
            return;
        }
        if (data == null) {
            screen.findPreference(KEY_HOTSPOT_DEVICE_CATEGORY).setVisible(false);
            screen.findPreference(KEY_HOTSPOT_CONNECTION_CATEGORY).setVisible(false);
            if (mWifiDetailPreferenceController2 != null) {
                mWifiDetailPreferenceController2.setSignalStrengthTitle(R.string.wifi_signal);
            }
            return;
        }
        screen.findPreference(KEY_HOTSPOT_DEVICE_CATEGORY).setVisible(true);
        updateInternetSource(data.getNetworkType(), data.getUpstreamConnectionStrength());
        updateBattery(data.isBatteryCharging(), data.getBatteryPercentage());

        screen.findPreference(KEY_HOTSPOT_CONNECTION_CATEGORY).setVisible(true);
        if (mWifiDetailPreferenceController2 != null) {
            mWifiDetailPreferenceController2
                    .setSignalStrengthTitle(R.string.hotspot_connection_strength);
        }
    }

    @VisibleForTesting
    void updateInternetSource(int networkType, int upstreamConnectionStrength) {
        Preference internetSource = getPreferenceScreen()
                .findPreference(KEY_HOTSPOT_DEVICE_INTERNET_SOURCE);
        Drawable drawable;
        if (networkType == HotspotNetwork.NETWORK_TYPE_WIFI) {
            internetSource.setSummary(R.string.internet_source_wifi);
            drawable = getContext().getDrawable(
                    WifiUtils.getInternetIconResource(upstreamConnectionStrength, false));
        } else if (networkType == HotspotNetwork.NETWORK_TYPE_CELLULAR) {
            internetSource.setSummary(R.string.internet_source_mobile_data);
            drawable = getMobileDataIcon(upstreamConnectionStrength);
        } else if (networkType == HotspotNetwork.NETWORK_TYPE_ETHERNET) {
            internetSource.setSummary(R.string.internet_source_ethernet);
            drawable = getContext().getDrawable(R.drawable.ic_settings_ethernet);
        } else {
            internetSource.setSummary(R.string.summary_placeholder);
            drawable = null;
        }
        if (drawable != null) {
            drawable.setTintList(
                    Utils.getColorAttr(getContext(), android.R.attr.colorControlNormal));
        }
        internetSource.setIcon(drawable);
    }

    @VisibleForTesting
    Drawable getMobileDataIcon(int level) {
        return MobileNetworkUtils.getSignalStrengthIcon(getContext(), level,
                SignalStrength.NUM_SIGNAL_STRENGTH_BINS, NO_CELL_DATA_TYPE_ICON, false, false);
    }

    @VisibleForTesting
    void updateBattery(boolean isChanging, int percentage) {
        Preference battery = getPreferenceScreen().findPreference(KEY_HOTSPOT_DEVICE_BATTERY);
        battery.setSummary((isChanging)
                ? getString(R.string.hotspot_battery_charging_summary, formatPercentage(percentage))
                : formatPercentage(percentage));
    }
}