/*
 * Copyright (C) 2016 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.dialer.calllog;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.AsyncTask;
import android.provider.CallLog.Calls;
import android.text.TextUtils;
import android.util.Log;

import com.android.contacts.common.ContactsUtils;
import com.android.contacts.common.util.PhoneNumberHelper;
import com.android.dialer.DialtactsActivity;
import com.android.dialer.R;
import com.android.dialer.calllog.CallLogNotificationsHelper.NewCall;
import com.android.dialer.contactinfo.ContactPhotoLoader;
import com.android.dialer.compat.UserManagerCompat;
import com.android.dialer.list.ListsFragment;
import com.android.dialer.util.DialerUtils;
import com.android.dialer.util.IntentUtil;
import com.android.dialer.util.IntentUtil.CallIntentBuilder;

import java.util.List;

/**
 * Creates a notification for calls that the user missed (neither answered nor rejected).
 *
 */
public class MissedCallNotifier {
    public static final String TAG = "MissedCallNotifier";

    /** The tag used to identify notifications from this class. */
    private static final String NOTIFICATION_TAG = "MissedCallNotifier";
    /** The identifier of the notification of new missed calls. */
    private static final int NOTIFICATION_ID = 1;
    /** Preference file key for number of missed calls. */
    private static final String MISSED_CALL_COUNT = "missed_call_count";

    private static MissedCallNotifier sInstance;
    private Context mContext;

    /** Returns the singleton instance of the {@link MissedCallNotifier}. */
    public static MissedCallNotifier getInstance(Context context) {
        if (sInstance == null) {
            sInstance = new MissedCallNotifier(context);
        }
        return sInstance;
    }

    private MissedCallNotifier(Context context) {
        mContext = context;
    }

    public void updateMissedCallNotification(int count, String number) {
        final int titleResId;
        final String expandedText;  // The text in the notification's line 1 and 2.

        final List<NewCall> newCalls =
                CallLogNotificationsHelper.getInstance(mContext).getNewMissedCalls();

        if (count == CallLogNotificationsService.UNKNOWN_MISSED_CALL_COUNT) {
            if (newCalls == null) {
                // If the intent did not contain a count, and we are unable to get a count from the
                // call log, then no notification can be shown.
                return;
            }
            count = newCalls.size();
        }

        if (count == 0) {
            // No voicemails to notify about: clear the notification.
            clearMissedCalls();
            return;
        }

        // The call log has been updated, use that information preferentially.
        boolean useCallLog = newCalls != null && newCalls.size() == count;
        NewCall newestCall = useCallLog ? newCalls.get(0) : null;
        long timeMs = useCallLog ? newestCall.dateMs : System.currentTimeMillis();

        Notification.Builder builder = new Notification.Builder(mContext);
        // Display the first line of the notification:
        // 1 missed call: <caller name || handle>
        // More than 1 missed call: <number of calls> + "missed calls"
        if (count == 1) {
            //TODO: look up caller ID that is not in contacts.
            ContactInfo contactInfo = CallLogNotificationsHelper.getInstance(mContext)
                    .getContactInfo(useCallLog ? newestCall.number : number,
                            useCallLog ? newestCall.numberPresentation
                                    : Calls.PRESENTATION_ALLOWED,
                            useCallLog ? newestCall.countryIso : null);

            titleResId = contactInfo.userType == ContactsUtils.USER_TYPE_WORK
                    ? R.string.notification_missedWorkCallTitle
                    : R.string.notification_missedCallTitle;

            expandedText = contactInfo.name;
            ContactPhotoLoader loader = new ContactPhotoLoader(mContext, contactInfo);
            Bitmap photoIcon = loader.loadPhotoIcon();
            if (photoIcon != null) {
                builder.setLargeIcon(photoIcon);
            }
        } else {
            titleResId = R.string.notification_missedCallsTitle;
            expandedText =
                    mContext.getString(R.string.notification_missedCallsMsg, count);
        }

        // Create a public viewable version of the notification, suitable for display when sensitive
        // notification content is hidden.
        Notification.Builder publicBuilder = new Notification.Builder(mContext);
        publicBuilder.setSmallIcon(android.R.drawable.stat_notify_missed_call)
                .setColor(mContext.getResources().getColor(R.color.dialer_theme_color))
                // Show "Phone" for notification title.
                .setContentTitle(mContext.getText(R.string.userCallActivityLabel))
                // Notification details shows that there are missed call(s), but does not reveal
                // the missed caller information.
                .setContentText(mContext.getText(titleResId))
                .setContentIntent(createCallLogPendingIntent())
                .setAutoCancel(true)
                .setWhen(timeMs)
                .setDeleteIntent(createClearMissedCallsPendingIntent());

        // Create the notification suitable for display when sensitive information is showing.
        builder.setSmallIcon(android.R.drawable.stat_notify_missed_call)
                .setColor(mContext.getResources().getColor(R.color.dialer_theme_color))
                .setContentTitle(mContext.getText(titleResId))
                .setContentText(expandedText)
                .setContentIntent(createCallLogPendingIntent())
                .setAutoCancel(true)
                .setWhen(timeMs)
                .setDeleteIntent(createClearMissedCallsPendingIntent())
                // Include a public version of the notification to be shown when the missed call
                // notification is shown on the user's lock screen and they have chosen to hide
                // sensitive notification information.
                .setPublicVersion(publicBuilder.build());

        // Add additional actions when there is only 1 missed call and the user isn't locked
        if (UserManagerCompat.isUserUnlocked(mContext) && count == 1) {
            if (!TextUtils.isEmpty(number)
                    && !TextUtils.equals(
                    number, mContext.getString(R.string.handle_restricted))) {
                builder.addAction(R.drawable.ic_phone_24dp,
                        mContext.getString(R.string.notification_missedCall_call_back),
                        createCallBackPendingIntent(number));

                if (!PhoneNumberHelper.isUriNumber(number)) {
                    builder.addAction(R.drawable.ic_message_24dp,
                            mContext.getString(R.string.notification_missedCall_message),
                            createSendSmsFromNotificationPendingIntent(number));
                }
            }
        }

        Notification notification = builder.build();
        configureLedOnNotification(notification);

        Log.i(TAG, "Adding missed call notification.");
        getNotificationMgr().notify(NOTIFICATION_TAG, NOTIFICATION_ID, notification);
    }

    private void clearMissedCalls() {
        AsyncTask.execute(new Runnable() {
            @Override
            public void run() {
                // Call log is only accessible when unlocked. If that's the case, clear the list of
                // new missed calls from the call log.
                if (UserManagerCompat.isUserUnlocked(mContext)) {
                    ContentValues values = new ContentValues();
                    values.put(Calls.NEW, 0);
                    values.put(Calls.IS_READ, 1);
                    StringBuilder where = new StringBuilder();
                    where.append(Calls.NEW);
                    where.append(" = 1 AND ");
                    where.append(Calls.TYPE);
                    where.append(" = ?");
                    try {
                        mContext.getContentResolver().update(Calls.CONTENT_URI, values,
                                where.toString(), new String[]{Integer.toString(Calls.
                                        MISSED_TYPE)});
                    } catch (IllegalArgumentException e) {
                        Log.w(TAG, "ContactsProvider update command failed", e);
                    }
                }
                getNotificationMgr().cancel(NOTIFICATION_TAG, NOTIFICATION_ID);
            }
        });
    }

    /**
     * Trigger an intent to make a call from a missed call number.
     */
    public void callBackFromMissedCall(String number) {
        closeSystemDialogs(mContext);
        CallLogNotificationsHelper.removeMissedCallNotifications(mContext);
        DialerUtils.startActivityWithErrorToast(
                mContext,
                new CallIntentBuilder(number)
                        .build()
                        .setFlags(Intent.FLAG_ACTIVITY_NEW_TASK));
    }

    /**
     * Trigger an intent to send an sms from a missed call number.
     */
    public void sendSmsFromMissedCall(String number) {
        closeSystemDialogs(mContext);
        CallLogNotificationsHelper.removeMissedCallNotifications(mContext);
        DialerUtils.startActivityWithErrorToast(
                mContext,
                IntentUtil.getSendSmsIntent(number).setFlags(Intent.FLAG_ACTIVITY_NEW_TASK));
    }

    /**
     * Creates a new pending intent that sends the user to the call log.
     *
     * @return The pending intent.
     */
    private PendingIntent createCallLogPendingIntent() {
        Intent contentIntent = new Intent(mContext, DialtactsActivity.class);
        contentIntent.putExtra(DialtactsActivity.EXTRA_SHOW_TAB, ListsFragment.TAB_INDEX_HISTORY);
        return PendingIntent.getActivity(
                mContext, 0, contentIntent,PendingIntent.FLAG_UPDATE_CURRENT);
    }

    /** Creates a pending intent that marks all new missed calls as old. */
    private PendingIntent createClearMissedCallsPendingIntent() {
        Intent intent = new Intent(mContext, CallLogNotificationsService.class);
        intent.setAction(CallLogNotificationsService.ACTION_MARK_NEW_MISSED_CALLS_AS_OLD);
        return PendingIntent.getService(mContext, 0, intent, 0);
    }

    private PendingIntent createCallBackPendingIntent(String number) {
        Intent intent = new Intent(mContext, CallLogNotificationsService.class);
        intent.setAction(
                CallLogNotificationsService.ACTION_CALL_BACK_FROM_MISSED_CALL_NOTIFICATION);
        intent.putExtra(CallLogNotificationsService.EXTRA_MISSED_CALL_NUMBER, number);
        // Use FLAG_UPDATE_CURRENT to make sure any previous pending intent is updated with the new
        // extra.
        return PendingIntent.getService(mContext, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
    }

    private PendingIntent createSendSmsFromNotificationPendingIntent(String number) {
        Intent intent = new Intent(mContext, CallLogNotificationsService.class);
        intent.setAction(
                CallLogNotificationsService.ACTION_SEND_SMS_FROM_MISSED_CALL_NOTIFICATION);
        intent.putExtra(CallLogNotificationsService.EXTRA_MISSED_CALL_NUMBER, number);
        // Use FLAG_UPDATE_CURRENT to make sure any previous pending intent is updated with the new
        // extra.
        return PendingIntent.getService(mContext, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
    }

    /**
     * Configures a notification to emit the blinky notification light.
     */
    private void configureLedOnNotification(Notification notification) {
        notification.flags |= Notification.FLAG_SHOW_LIGHTS;
        notification.defaults |= Notification.DEFAULT_LIGHTS;
    }

    /**
     * Closes open system dialogs and the notification shade.
     */
    private void closeSystemDialogs(Context context) {
        context.sendBroadcast(new Intent(Intent.ACTION_CLOSE_SYSTEM_DIALOGS));
    }

    private NotificationManager getNotificationMgr() {
        return (NotificationManager) mContext.getSystemService(Context.NOTIFICATION_SERVICE);
    }
}