/*
 * Copyright (C) 2010 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.notification;

import android.app.AlertDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.app.NotificationManager;
import android.content.ComponentName;
import android.content.Context;
import android.content.DialogInterface;
import android.content.pm.PackageManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.provider.Settings;
import android.service.notification.NotificationListenerService;

import com.android.internal.logging.MetricsProto.MetricsEvent;
import com.android.settings.R;
import com.android.settings.core.instrumentation.InstrumentedDialogFragment;
import com.android.settings.utils.ManagedServiceSettings;
import com.android.settings.utils.ServiceListing;

public class NotificationAccessSettings extends ManagedServiceSettings {
    private static final String TAG = NotificationAccessSettings.class.getSimpleName();
    private static final Config CONFIG = getNotificationListenerConfig();

    private NotificationManager mNm;

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        mNm = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    }

    private static Config getNotificationListenerConfig() {
        final Config c = new Config();
        c.tag = TAG;
        c.setting = Settings.Secure.ENABLED_NOTIFICATION_LISTENERS;
        c.intentAction = NotificationListenerService.SERVICE_INTERFACE;
        c.permission = android.Manifest.permission.BIND_NOTIFICATION_LISTENER_SERVICE;
        c.noun = "notification listener";
        c.warningDialogTitle = R.string.notification_listener_security_warning_title;
        c.warningDialogSummary = R.string.notification_listener_security_warning_summary;
        c.emptyText = R.string.no_notification_listeners;
        return c;
    }

    @Override
    public int getMetricsCategory() {
        return MetricsEvent.NOTIFICATION_ACCESS;
    }

    @Override
    protected Config getConfig() {
        return CONFIG;
    }

    public static int getListenersCount(PackageManager pm) {
        return ServiceListing.getServicesCount(CONFIG, pm);
    }

    public static int getEnabledListenersCount(Context context) {
        return ServiceListing.getEnabledServicesCount(CONFIG, context);
    }

    protected boolean setEnabled(ComponentName service, String title, boolean enable) {
        if (!enable) {
            if (!mServiceListing.isEnabled(service)) {
                return true; // already disabled
            }
            // show a friendly dialog
            new FriendlyWarningDialogFragment()
                    .setServiceInfo(service, title)
                    .show(getFragmentManager(), "friendlydialog");
            return false;
        } else {
            return super.setEnabled(service, title, enable);
        }
    }

    private static void deleteRules(final Context context, final String pkg) {
        AsyncTask.execute(new Runnable() {
            @Override
            public void run() {
                final NotificationManager mgr = context.getSystemService(NotificationManager.class);
                mgr.removeAutomaticZenRules(pkg);
            }
        });
    }

    public class FriendlyWarningDialogFragment extends InstrumentedDialogFragment {
        static final String KEY_COMPONENT = "c";
        static final String KEY_LABEL = "l";

        public FriendlyWarningDialogFragment setServiceInfo(ComponentName cn, String label) {
            Bundle args = new Bundle();
            args.putString(KEY_COMPONENT, cn.flattenToString());
            args.putString(KEY_LABEL, label);
            setArguments(args);
            return this;
        }

        @Override
        public int getMetricsCategory() {
            return MetricsEvent.DIALOG_DISABLE_NOTIFICATION_ACCESS;
        }

        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            final Bundle args = getArguments();
            final String label = args.getString(KEY_LABEL);
            final ComponentName cn = ComponentName.unflattenFromString(args
                    .getString(KEY_COMPONENT));

            final String summary = getResources().getString(
                    R.string.notification_listener_disable_warning_summary, label);
            return new AlertDialog.Builder(mContext)
                    .setMessage(summary)
                    .setCancelable(true)
                    .setPositiveButton(R.string.notification_listener_disable_warning_confirm,
                            new DialogInterface.OnClickListener() {
                                public void onClick(DialogInterface dialog, int id) {
                                    mServiceListing.setEnabled(cn, false);
                                    if (!mNm.isNotificationPolicyAccessGrantedForPackage(
                                            cn.getPackageName())) {
                                        deleteRules(mContext, cn.getPackageName());
                                    }
                                }
                            })
                    .setNegativeButton(R.string.notification_listener_disable_warning_cancel,
                            new DialogInterface.OnClickListener() {
                                public void onClick(DialogInterface dialog, int id) {
                                    // pass
                                }
                            })
                    .create();
        }
    }
}