/*
 * Copyright (C) 2008 Esmertec AG.
 * Copyright (C) 2008 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.mms.ui;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.ContentUris;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnCancelListener;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.content.res.Resources;
import android.database.Cursor;
import android.database.sqlite.SqliteWrapper;
import android.media.CamcorderProfile;
import android.media.RingtoneManager;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.provider.MediaStore;
import android.provider.Telephony.Mms;
import android.provider.Telephony.Sms;
import android.telephony.PhoneNumberUtils;
import android.text.TextUtils;
import android.text.format.DateUtils;
import android.text.format.Time;
import android.text.style.URLSpan;
import android.util.Log;
import android.widget.Toast;

import com.android.mms.LogTag;
import com.android.mms.MmsApp;
import com.android.mms.MmsConfig;
import com.android.mms.R;
import com.android.mms.TempFileProvider;
import com.android.mms.data.WorkingMessage;
import com.android.mms.model.MediaModel;
import com.android.mms.model.SlideModel;
import com.android.mms.model.SlideshowModel;
import com.android.mms.transaction.MmsMessageSender;
import com.android.mms.util.AddressUtils;
import com.google.android.mms.ContentType;
import com.google.android.mms.MmsException;
import com.google.android.mms.pdu.CharacterSets;
import com.google.android.mms.pdu.EncodedStringValue;
import com.google.android.mms.pdu.MultimediaMessagePdu;
import com.google.android.mms.pdu.NotificationInd;
import com.google.android.mms.pdu.PduBody;
import com.google.android.mms.pdu.PduHeaders;
import com.google.android.mms.pdu.PduPart;
import com.google.android.mms.pdu.PduPersister;
import com.google.android.mms.pdu.RetrieveConf;
import com.google.android.mms.pdu.SendReq;

/**
 * An utility class for managing messages.
 */
public class MessageUtils {
    interface ResizeImageResultCallback {
        void onResizeResult(PduPart part, boolean append);
    }

    private static final String TAG = LogTag.TAG;
    private static String sLocalNumber;
    private static String[] sNoSubjectStrings;

    // Cache of both groups of space-separated ids to their full
    // comma-separated display names, as well as individual ids to
    // display names.
    // TODO: is it possible for canonical address ID keys to be
    // re-used?  SQLite does reuse IDs on NULL id_ insert, but does
    // anything ever delete from the mmssms.db canonical_addresses
    // table?  Nothing that I could find.
    private static final Map<String, String> sRecipientAddress =
            new ConcurrentHashMap<String, String>(20 /* initial capacity */);

    // When we pass a video record duration to the video recorder, use one of these values.
    private static final int[] sVideoDuration =
            new int[] {0, 5, 10, 15, 20, 30, 40, 50, 60, 90, 120};

    /**
     * MMS address parsing data structures
     */
    // allowable phone number separators
    private static final char[] NUMERIC_CHARS_SUGAR = {
        '-', '.', ',', '(', ')', ' ', '/', '\\', '*', '#', '+'
    };

    private static HashMap numericSugarMap = new HashMap (NUMERIC_CHARS_SUGAR.length);

    static {
        for (int i = 0; i < NUMERIC_CHARS_SUGAR.length; i++) {
            numericSugarMap.put(NUMERIC_CHARS_SUGAR[i], NUMERIC_CHARS_SUGAR[i]);
        }
    }


    private MessageUtils() {
        // Forbidden being instantiated.
    }

    /**
     * cleanseMmsSubject will take a subject that's says, "<Subject: no subject>", and return
     * a null string. Otherwise it will return the original subject string.
     * @param context a regular context so the function can grab string resources
     * @param subject the raw subject
     * @return
     */
    public static String cleanseMmsSubject(Context context, String subject) {
        if (TextUtils.isEmpty(subject)) {
            return subject;
        }
        if (sNoSubjectStrings == null) {
            sNoSubjectStrings =
                    context.getResources().getStringArray(R.array.empty_subject_strings);

        }
        final int len = sNoSubjectStrings.length;
        for (int i = 0; i < len; i++) {
            if (subject.equalsIgnoreCase(sNoSubjectStrings[i])) {
                return null;
            }
        }
        return subject;
    }

    public static String getMessageDetails(Context context, Cursor cursor, int size) {
        if (cursor == null) {
            return null;
        }

        if ("mms".equals(cursor.getString(MessageListAdapter.COLUMN_MSG_TYPE))) {
            int type = cursor.getInt(MessageListAdapter.COLUMN_MMS_MESSAGE_TYPE);
            switch (type) {
                case PduHeaders.MESSAGE_TYPE_NOTIFICATION_IND:
                    return getNotificationIndDetails(context, cursor);
                case PduHeaders.MESSAGE_TYPE_RETRIEVE_CONF:
                case PduHeaders.MESSAGE_TYPE_SEND_REQ:
                    return getMultimediaMessageDetails(context, cursor, size);
                default:
                    Log.w(TAG, "No details could be retrieved.");
                    return "";
            }
        } else {
            return getTextMessageDetails(context, cursor);
        }
    }

    private static String getNotificationIndDetails(Context context, Cursor cursor) {
        StringBuilder details = new StringBuilder();
        Resources res = context.getResources();

        long id = cursor.getLong(MessageListAdapter.COLUMN_ID);
        Uri uri = ContentUris.withAppendedId(Mms.CONTENT_URI, id);
        NotificationInd nInd;

        try {
            nInd = (NotificationInd) PduPersister.getPduPersister(
                    context).load(uri);
        } catch (MmsException e) {
            Log.e(TAG, "Failed to load the message: " + uri, e);
            return context.getResources().getString(R.string.cannot_get_details);
        }

        // Message Type: Mms Notification.
        details.append(res.getString(R.string.message_type_label));
        details.append(res.getString(R.string.multimedia_notification));

        // From: ***
        String from = extractEncStr(context, nInd.getFrom());
        details.append('\n');
        details.append(res.getString(R.string.from_label));
        details.append(!TextUtils.isEmpty(from)? from:
                                 res.getString(R.string.hidden_sender_address));

        // Date: ***
        details.append('\n');
        details.append(res.getString(
                                R.string.expire_on,
                                MessageUtils.formatTimeStampString(
                                        context, nInd.getExpiry() * 1000L, true)));

        // Subject: ***
        details.append('\n');
        details.append(res.getString(R.string.subject_label));

        EncodedStringValue subject = nInd.getSubject();
        if (subject != null) {
            details.append(subject.getString());
        }

        // Message class: Personal/Advertisement/Infomational/Auto
        details.append('\n');
        details.append(res.getString(R.string.message_class_label));
        details.append(new String(nInd.getMessageClass()));

        // Message size: *** KB
        details.append('\n');
        details.append(res.getString(R.string.message_size_label));
        details.append(String.valueOf((nInd.getMessageSize() + 1023) / 1024));
        details.append(context.getString(R.string.kilobyte));

        return details.toString();
    }

    private static String getMultimediaMessageDetails(
            Context context, Cursor cursor, int size) {
        int type = cursor.getInt(MessageListAdapter.COLUMN_MMS_MESSAGE_TYPE);
        if (type == PduHeaders.MESSAGE_TYPE_NOTIFICATION_IND) {
            return getNotificationIndDetails(context, cursor);
        }

        StringBuilder details = new StringBuilder();
        Resources res = context.getResources();

        long id = cursor.getLong(MessageListAdapter.COLUMN_ID);
        Uri uri = ContentUris.withAppendedId(Mms.CONTENT_URI, id);
        MultimediaMessagePdu msg;

        try {
            msg = (MultimediaMessagePdu) PduPersister.getPduPersister(
                    context).load(uri);
        } catch (MmsException e) {
            Log.e(TAG, "Failed to load the message: " + uri, e);
            return context.getResources().getString(R.string.cannot_get_details);
        }

        // Message Type: Text message.
        details.append(res.getString(R.string.message_type_label));
        details.append(res.getString(R.string.multimedia_message));

        if (msg instanceof RetrieveConf) {
            // From: ***
            String from = extractEncStr(context, ((RetrieveConf) msg).getFrom());
            details.append('\n');
            details.append(res.getString(R.string.from_label));
            details.append(!TextUtils.isEmpty(from)? from:
                                  res.getString(R.string.hidden_sender_address));
        }

        // To: ***
        details.append('\n');
        details.append(res.getString(R.string.to_address_label));
        EncodedStringValue[] to = msg.getTo();
        if (to != null) {
            details.append(EncodedStringValue.concat(to));
        }
        else {
            Log.w(TAG, "recipient list is empty!");
        }


        // Bcc: ***
        if (msg instanceof SendReq) {
            EncodedStringValue[] values = ((SendReq) msg).getBcc();
            if ((values != null) && (values.length > 0)) {
                details.append('\n');
                details.append(res.getString(R.string.bcc_label));
                details.append(EncodedStringValue.concat(values));
            }
        }

        // Date: ***
        details.append('\n');
        int msgBox = cursor.getInt(MessageListAdapter.COLUMN_MMS_MESSAGE_BOX);
        if (msgBox == Mms.MESSAGE_BOX_DRAFTS) {
            details.append(res.getString(R.string.saved_label));
        } else if (msgBox == Mms.MESSAGE_BOX_INBOX) {
            details.append(res.getString(R.string.received_label));
        } else {
            details.append(res.getString(R.string.sent_label));
        }

        details.append(MessageUtils.formatTimeStampString(
                context, msg.getDate() * 1000L, true));

        // Subject: ***
        details.append('\n');
        details.append(res.getString(R.string.subject_label));

        EncodedStringValue subject = msg.getSubject();
        if (subject != null) {
            String subStr = subject.getString();
            // Message size should include size of subject.
            size += subStr.length();
            details.append(subStr);
        }

        // Priority: High/Normal/Low
        details.append('\n');
        details.append(res.getString(R.string.priority_label));
        details.append(getPriorityDescription(context, msg.getPriority()));

        // Message size: *** KB
        details.append('\n');
        details.append(res.getString(R.string.message_size_label));
        details.append((size - 1)/1000 + 1);
        details.append(" KB");

        return details.toString();
    }

    private static String getTextMessageDetails(Context context, Cursor cursor) {
        Log.d(TAG, "getTextMessageDetails");

        StringBuilder details = new StringBuilder();
        Resources res = context.getResources();

        // Message Type: Text message.
        details.append(res.getString(R.string.message_type_label));
        details.append(res.getString(R.string.text_message));

        // Address: ***
        details.append('\n');
        int smsType = cursor.getInt(MessageListAdapter.COLUMN_SMS_TYPE);
        if (Sms.isOutgoingFolder(smsType)) {
            details.append(res.getString(R.string.to_address_label));
        } else {
            details.append(res.getString(R.string.from_label));
        }
        details.append(cursor.getString(MessageListAdapter.COLUMN_SMS_ADDRESS));

        // Sent: ***
        if (smsType == Sms.MESSAGE_TYPE_INBOX) {
            long date_sent = cursor.getLong(MessageListAdapter.COLUMN_SMS_DATE_SENT);
            if (date_sent > 0) {
                details.append('\n');
                details.append(res.getString(R.string.sent_label));
                details.append(MessageUtils.formatTimeStampString(context, date_sent, true));
            }
        }

        // Received: ***
        details.append('\n');
        if (smsType == Sms.MESSAGE_TYPE_DRAFT) {
            details.append(res.getString(R.string.saved_label));
        } else if (smsType == Sms.MESSAGE_TYPE_INBOX) {
            details.append(res.getString(R.string.received_label));
        } else {
            details.append(res.getString(R.string.sent_label));
        }

        long date = cursor.getLong(MessageListAdapter.COLUMN_SMS_DATE);
        details.append(MessageUtils.formatTimeStampString(context, date, true));

        // Delivered: ***
        if (smsType == Sms.MESSAGE_TYPE_SENT) {
            // For sent messages with delivery reports, we stick the delivery time in the
            // date_sent column (see MessageStatusReceiver).
            long dateDelivered = cursor.getLong(MessageListAdapter.COLUMN_SMS_DATE_SENT);
            if (dateDelivered > 0) {
                details.append('\n');
                details.append(res.getString(R.string.delivered_label));
                details.append(MessageUtils.formatTimeStampString(context, dateDelivered, true));
            }
        }

        // Error code: ***
        int errorCode = cursor.getInt(MessageListAdapter.COLUMN_SMS_ERROR_CODE);
        if (errorCode != 0) {
            details.append('\n')
                .append(res.getString(R.string.error_code_label))
                .append(errorCode);
        }

        return details.toString();
    }

    static private String getPriorityDescription(Context context, int PriorityValue) {
        Resources res = context.getResources();
        switch(PriorityValue) {
            case PduHeaders.PRIORITY_HIGH:
                return res.getString(R.string.priority_high);
            case PduHeaders.PRIORITY_LOW:
                return res.getString(R.string.priority_low);
            case PduHeaders.PRIORITY_NORMAL:
            default:
                return res.getString(R.string.priority_normal);
        }
    }

    public static int getAttachmentType(SlideshowModel model) {
        if (model == null) {
            return MessageItem.ATTACHMENT_TYPE_NOT_LOADED;
        }

        int numberOfSlides = model.size();
        if (numberOfSlides > 1) {
            return WorkingMessage.SLIDESHOW;
        } else if (numberOfSlides == 1) {
            // Only one slide in the slide-show.
            SlideModel slide = model.get(0);
            if (slide.hasVideo()) {
                return WorkingMessage.VIDEO;
            }

            if (slide.hasAudio() && slide.hasImage()) {
                return WorkingMessage.SLIDESHOW;
            }

            if (slide.hasAudio()) {
                return WorkingMessage.AUDIO;
            }

            if (slide.hasImage()) {
                return WorkingMessage.IMAGE;
            }

            if (slide.hasText()) {
                return WorkingMessage.TEXT;
            }
        }

        return MessageItem.ATTACHMENT_TYPE_NOT_LOADED;
    }

    public static String formatTimeStampString(Context context, long when) {
        return formatTimeStampString(context, when, false);
    }

    public static String formatTimeStampString(Context context, long when, boolean fullFormat) {
        Time then = new Time();
        then.set(when);
        Time now = new Time();
        now.setToNow();

        // Basic settings for formatDateTime() we want for all cases.
        int format_flags = DateUtils.FORMAT_NO_NOON_MIDNIGHT |
                           DateUtils.FORMAT_ABBREV_ALL |
                           DateUtils.FORMAT_CAP_AMPM;

        // If the message is from a different year, show the date and year.
        if (then.year != now.year) {
            format_flags |= DateUtils.FORMAT_SHOW_YEAR | DateUtils.FORMAT_SHOW_DATE;
        } else if (then.yearDay != now.yearDay) {
            // If it is from a different day than today, show only the date.
            format_flags |= DateUtils.FORMAT_SHOW_DATE;
        } else {
            // Otherwise, if the message is from today, show the time.
            format_flags |= DateUtils.FORMAT_SHOW_TIME;
        }

        // If the caller has asked for full details, make sure to show the date
        // and time no matter what we've determined above (but still make showing
        // the year only happen if it is a different year from today).
        if (fullFormat) {
            format_flags |= (DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_TIME);
        }

        return DateUtils.formatDateTime(context, when, format_flags);
    }

    public static void selectAudio(Activity activity, int requestCode) {
        Intent intent = new Intent(RingtoneManager.ACTION_RINGTONE_PICKER);
        intent.putExtra(RingtoneManager.EXTRA_RINGTONE_SHOW_DEFAULT, false);
        intent.putExtra(RingtoneManager.EXTRA_RINGTONE_SHOW_SILENT, false);
        intent.putExtra(RingtoneManager.EXTRA_RINGTONE_INCLUDE_DRM, false);
        intent.putExtra(RingtoneManager.EXTRA_RINGTONE_TITLE,
                activity.getString(R.string.select_audio));
        activity.startActivityForResult(intent, requestCode);
    }

    public static void recordSound(Activity activity, int requestCode, long sizeLimit) {
        Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
        intent.setType(ContentType.AUDIO_AMR);
        intent.setClassName("com.android.soundrecorder",
                "com.android.soundrecorder.SoundRecorder");
        intent.putExtra(android.provider.MediaStore.Audio.Media.EXTRA_MAX_BYTES, sizeLimit);
        activity.startActivityForResult(intent, requestCode);
    }

    public static void recordVideo(Activity activity, int requestCode, long sizeLimit) {
        // The video recorder can sometimes return a file that's larger than the max we
        // say we can handle. Try to handle that overshoot by specifying an 85% limit.
        sizeLimit *= .85F;

        int durationLimit = getVideoCaptureDurationLimit(sizeLimit);

        if (Log.isLoggable(LogTag.APP, Log.VERBOSE)) {
            log("recordVideo: durationLimit: " + durationLimit +
                    " sizeLimit: " + sizeLimit);
        }

        Intent intent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
        intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 0);
        intent.putExtra("android.intent.extra.sizeLimit", sizeLimit);
        intent.putExtra("android.intent.extra.durationLimit", durationLimit);
        intent.putExtra(MediaStore.EXTRA_OUTPUT, TempFileProvider.SCRAP_CONTENT_URI);
        activity.startActivityForResult(intent, requestCode);
    }

    public static void capturePicture(Activity activity, int requestCode) {
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        intent.putExtra(MediaStore.EXTRA_OUTPUT, TempFileProvider.SCRAP_CONTENT_URI);
        activity.startActivityForResult(intent, requestCode);
    }

    // Public for until tests
    public static int getVideoCaptureDurationLimit(long bytesAvailable) {
        CamcorderProfile camcorder = CamcorderProfile.get(CamcorderProfile.QUALITY_LOW);
        if (camcorder == null) {
            return 0;
        }
        bytesAvailable *= 8;        // convert to bits
        long seconds = bytesAvailable / (camcorder.audioBitRate + camcorder.videoBitRate);

        // Find the best match for one of the fixed durations
        for (int i = sVideoDuration.length - 1; i >= 0; i--) {
            if (seconds >= sVideoDuration[i]) {
                return sVideoDuration[i];
            }
        }
        return 0;
    }

    public static void selectVideo(Context context, int requestCode) {
        selectMediaByType(context, requestCode, ContentType.VIDEO_UNSPECIFIED, true);
    }

    public static void selectImage(Context context, int requestCode) {
        selectMediaByType(context, requestCode, ContentType.IMAGE_UNSPECIFIED, false);
    }

    private static void selectMediaByType(
            Context context, int requestCode, String contentType, boolean localFilesOnly) {
         if (context instanceof Activity) {

            Intent innerIntent = new Intent(Intent.ACTION_GET_CONTENT);

            innerIntent.setType(contentType);
            if (localFilesOnly) {
                innerIntent.putExtra(Intent.EXTRA_LOCAL_ONLY, true);
            }

            Intent wrapperIntent = Intent.createChooser(innerIntent, null);

            ((Activity) context).startActivityForResult(wrapperIntent, requestCode);
        }
    }

    public static void viewSimpleSlideshow(Context context, SlideshowModel slideshow) {
        if (!slideshow.isSimple()) {
            throw new IllegalArgumentException(
                    "viewSimpleSlideshow() called on a non-simple slideshow");
        }
        SlideModel slide = slideshow.get(0);
        MediaModel mm = null;
        if (slide.hasImage()) {
            mm = slide.getImage();
        } else if (slide.hasVideo()) {
            mm = slide.getVideo();
        }

        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
        intent.putExtra("SingleItemOnly", true); // So we don't see "surrounding" images in Gallery

        String contentType;
        contentType = mm.getContentType();
        intent.setDataAndType(mm.getUri(), contentType);
        context.startActivity(intent);
    }

    public static void showErrorDialog(Activity activity,
            String title, String message) {
        if (activity.isFinishing()) {
            return;
        }
        AlertDialog.Builder builder = new AlertDialog.Builder(activity);

        builder.setIcon(R.drawable.ic_sms_mms_not_delivered);
        builder.setTitle(title);
        builder.setMessage(message);
        builder.setPositiveButton(android.R.string.ok, new OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                if (which == DialogInterface.BUTTON_POSITIVE) {
                    dialog.dismiss();
                }
            }
        });
        builder.show();
    }

    /**
     * The quality parameter which is used to compress JPEG images.
     */
    public static final int IMAGE_COMPRESSION_QUALITY = 95;
    /**
     * The minimum quality parameter which is used to compress JPEG images.
     */
    public static final int MINIMUM_IMAGE_COMPRESSION_QUALITY = 50;

    /**
     * Message overhead that reduces the maximum image byte size.
     * 5000 is a realistic overhead number that allows for user to also include
     * a small MIDI file or a couple pages of text along with the picture.
     */
    public static final int MESSAGE_OVERHEAD = 5000;

    public static void resizeImageAsync(final Context context,
            final Uri imageUri, final Handler handler,
            final ResizeImageResultCallback cb,
            final boolean append) {

        // Show a progress toast if the resize hasn't finished
        // within one second.
        // Stash the runnable for showing it away so we can cancel
        // it later if the resize completes ahead of the deadline.
        final Runnable showProgress = new Runnable() {
            @Override
            public void run() {
                Toast.makeText(context, R.string.compressing, Toast.LENGTH_SHORT).show();
            }
        };
        // Schedule it for one second from now.
        handler.postDelayed(showProgress, 1000);

        new Thread(new Runnable() {
            @Override
            public void run() {
                final PduPart part;
                try {
                    UriImage image = new UriImage(context, imageUri);
                    int widthLimit = MmsConfig.getMaxImageWidth();
                    int heightLimit = MmsConfig.getMaxImageHeight();
                    // In mms_config.xml, the max width has always been declared larger than the max
                    // height. Swap the width and height limits if necessary so we scale the picture
                    // as little as possible.
                    if (image.getHeight() > image.getWidth()) {
                        int temp = widthLimit;
                        widthLimit = heightLimit;
                        heightLimit = temp;
                    }

                    part = image.getResizedImageAsPart(
                        widthLimit,
                        heightLimit,
                        MmsConfig.getMaxMessageSize() - MESSAGE_OVERHEAD);
                } finally {
                    // Cancel pending show of the progress toast if necessary.
                    handler.removeCallbacks(showProgress);
                }

                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        cb.onResizeResult(part, append);
                    }
                });
            }
        }, "MessageUtils.resizeImageAsync").start();
    }

    public static void showDiscardDraftConfirmDialog(Context context,
            OnClickListener listener) {
        new AlertDialog.Builder(context)
                .setMessage(R.string.discard_message_reason)
                .setPositiveButton(R.string.yes, listener)
                .setNegativeButton(R.string.no, null)
                .show();
    }

    public static String getLocalNumber() {
        if (null == sLocalNumber) {
            sLocalNumber = MmsApp.getApplication().getTelephonyManager().getLine1Number();
        }
        return sLocalNumber;
    }

    public static boolean isLocalNumber(String number) {
        if (number == null) {
            return false;
        }

        // we don't use Mms.isEmailAddress() because it is too strict for comparing addresses like
        // "foo+caf_=6505551212=tmomail.net@gmail.com", which is the 'from' address from a forwarded email
        // message from Gmail. We don't want to treat "foo+caf_=6505551212=tmomail.net@gmail.com" and
        // "6505551212" to be the same.
        if (number.indexOf('@') >= 0) {
            return false;
        }

        return PhoneNumberUtils.compare(number, getLocalNumber());
    }

    public static void handleReadReport(final Context context,
            final Collection<Long> threadIds,
            final int status,
            final Runnable callback) {
        StringBuilder selectionBuilder = new StringBuilder(Mms.MESSAGE_TYPE + " = "
                + PduHeaders.MESSAGE_TYPE_RETRIEVE_CONF
                + " AND " + Mms.READ + " = 0"
                + " AND " + Mms.READ_REPORT + " = " + PduHeaders.VALUE_YES);

        String[] selectionArgs = null;
        if (threadIds != null) {
            String threadIdSelection = null;
            StringBuilder buf = new StringBuilder();
            selectionArgs = new String[threadIds.size()];
            int i = 0;

            for (long threadId : threadIds) {
                if (i > 0) {
                    buf.append(" OR ");
                }
                buf.append(Mms.THREAD_ID).append("=?");
                selectionArgs[i++] = Long.toString(threadId);
            }
            threadIdSelection = buf.toString();

            selectionBuilder.append(" AND (" + threadIdSelection + ")");
        }

        final Cursor c = SqliteWrapper.query(context, context.getContentResolver(),
                        Mms.Inbox.CONTENT_URI, new String[] {Mms._ID, Mms.MESSAGE_ID},
                        selectionBuilder.toString(), selectionArgs, null);

        if (c == null) {
            return;
        }

        final Map<String, String> map = new HashMap<String, String>();
        try {
            if (c.getCount() == 0) {
                if (callback != null) {
                    callback.run();
                }
                return;
            }

            while (c.moveToNext()) {
                Uri uri = ContentUris.withAppendedId(Mms.CONTENT_URI, c.getLong(0));
                map.put(c.getString(1), AddressUtils.getFrom(context, uri));
            }
        } finally {
            c.close();
        }

        OnClickListener positiveListener = new OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                for (final Map.Entry<String, String> entry : map.entrySet()) {
                    MmsMessageSender.sendReadRec(context, entry.getValue(),
                                                 entry.getKey(), status);
                }

                if (callback != null) {
                    callback.run();
                }
                dialog.dismiss();
            }
        };

        OnClickListener negativeListener = new OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                if (callback != null) {
                    callback.run();
                }
                dialog.dismiss();
            }
        };

        OnCancelListener cancelListener = new OnCancelListener() {
            @Override
            public void onCancel(DialogInterface dialog) {
                if (callback != null) {
                    callback.run();
                }
                dialog.dismiss();
            }
        };

        confirmReadReportDialog(context, positiveListener,
                                         negativeListener,
                                         cancelListener);
    }

    private static void confirmReadReportDialog(Context context,
            OnClickListener positiveListener, OnClickListener negativeListener,
            OnCancelListener cancelListener) {
        AlertDialog.Builder builder = new AlertDialog.Builder(context);
        builder.setCancelable(true);
        builder.setTitle(R.string.confirm);
        builder.setMessage(R.string.message_send_read_report);
        builder.setPositiveButton(R.string.yes, positiveListener);
        builder.setNegativeButton(R.string.no, negativeListener);
        builder.setOnCancelListener(cancelListener);
        builder.show();
    }

    public static String extractEncStrFromCursor(Cursor cursor,
            int columnRawBytes, int columnCharset) {
        String rawBytes = cursor.getString(columnRawBytes);
        int charset = cursor.getInt(columnCharset);

        if (TextUtils.isEmpty(rawBytes)) {
            return "";
        } else if (charset == CharacterSets.ANY_CHARSET) {
            return rawBytes;
        } else {
            return new EncodedStringValue(charset, PduPersister.getBytes(rawBytes)).getString();
        }
    }

    private static String extractEncStr(Context context, EncodedStringValue value) {
        if (value != null) {
            return value.getString();
        } else {
            return "";
        }
    }

    public static ArrayList<String> extractUris(URLSpan[] spans) {
        int size = spans.length;
        ArrayList<String> accumulator = new ArrayList<String>();

        for (int i = 0; i < size; i++) {
            accumulator.add(spans[i].getURL());
        }
        return accumulator;
    }

    /**
     * Play/view the message attachments.
     * TOOD: We need to save the draft before launching another activity to view the attachments.
     *       This is hacky though since we will do saveDraft twice and slow down the UI.
     *       We should pass the slideshow in intent extra to the view activity instead of
     *       asking it to read attachments from database.
     * @param activity
     * @param msgUri the MMS message URI in database
     * @param slideshow the slideshow to save
     * @param persister the PDU persister for updating the database
     * @param sendReq the SendReq for updating the database
     */
    public static void viewMmsMessageAttachment(Activity activity, Uri msgUri,
            SlideshowModel slideshow, AsyncDialog asyncDialog) {
        viewMmsMessageAttachment(activity, msgUri, slideshow, 0, asyncDialog);
    }

    public static void viewMmsMessageAttachment(final Activity activity, final Uri msgUri,
            final SlideshowModel slideshow, final int requestCode, AsyncDialog asyncDialog) {
        boolean isSimple = (slideshow == null) ? false : slideshow.isSimple();
        if (isSimple) {
            // In attachment-editor mode, we only ever have one slide.
            MessageUtils.viewSimpleSlideshow(activity, slideshow);
        } else {
            // The user wants to view the slideshow. We have to persist the slideshow parts
            // in a background task. If the task takes longer than a half second, a progress dialog
            // is displayed. Once the PDU persisting is done, another runnable on the UI thread get
            // executed to start the SlideshowActivity.
            asyncDialog.runAsync(new Runnable() {
                @Override
                public void run() {
                    // If a slideshow was provided, save it to disk first.
                    if (slideshow != null) {
                        PduPersister persister = PduPersister.getPduPersister(activity);
                        try {
                            PduBody pb = slideshow.toPduBody();
                            persister.updateParts(msgUri, pb, null);
                            slideshow.sync(pb);
                        } catch (MmsException e) {
                            Log.e(TAG, "Unable to save message for preview");
                            return;
                        }
                    }
                }
            }, new Runnable() {
                @Override
                public void run() {
                    // Once the above background thread is complete, this runnable is run
                    // on the UI thread to launch the slideshow activity.
                    launchSlideshowActivity(activity, msgUri, requestCode);
                }
            }, R.string.building_slideshow_title);
        }
    }

    public static void launchSlideshowActivity(Context context, Uri msgUri, int requestCode) {
        // Launch the slideshow activity to play/view.
        Intent intent = new Intent(context, SlideshowActivity.class);
        intent.setData(msgUri);
        intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
        if (requestCode > 0 && context instanceof Activity) {
            ((Activity)context).startActivityForResult(intent, requestCode);
        } else {
            context.startActivity(intent);
        }

    }

    /**
     * Debugging
     */
    public static void writeHprofDataToFile(){
        String filename = Environment.getExternalStorageDirectory() + "/mms_oom_hprof_data";
        try {
            android.os.Debug.dumpHprofData(filename);
            Log.i(TAG, "##### written hprof data to " + filename);
        } catch (IOException ex) {
            Log.e(TAG, "writeHprofDataToFile: caught " + ex);
        }
    }

    // An alias (or commonly called "nickname") is:
    // Nickname must begin with a letter.
    // Only letters a-z, numbers 0-9, or . are allowed in Nickname field.
    public static boolean isAlias(String string) {
        if (!MmsConfig.isAliasEnabled()) {
            return false;
        }

        int len = string == null ? 0 : string.length();

        if (len < MmsConfig.getAliasMinChars() || len > MmsConfig.getAliasMaxChars()) {
            return false;
        }

        if (!Character.isLetter(string.charAt(0))) {    // Nickname begins with a letter
            return false;
        }
        for (int i = 1; i < len; i++) {
            char c = string.charAt(i);
            if (!(Character.isLetterOrDigit(c) || c == '.')) {
                return false;
            }
        }

        return true;
    }

    /**
     * Given a phone number, return the string without syntactic sugar, meaning parens,
     * spaces, slashes, dots, dashes, etc. If the input string contains non-numeric
     * non-punctuation characters, return null.
     */
    private static String parsePhoneNumberForMms(String address) {
        StringBuilder builder = new StringBuilder();
        int len = address.length();

        for (int i = 0; i < len; i++) {
            char c = address.charAt(i);

            // accept the first '+' in the address
            if (c == '+' && builder.length() == 0) {
                builder.append(c);
                continue;
            }

            if (Character.isDigit(c)) {
                builder.append(c);
                continue;
            }

            if (numericSugarMap.get(c) == null) {
                return null;
            }
        }
        return builder.toString();
    }

    /**
     * Returns true if the address passed in is a valid MMS address.
     */
    public static boolean isValidMmsAddress(String address) {
        String retVal = parseMmsAddress(address);
        return (retVal != null);
    }

    /**
     * parse the input address to be a valid MMS address.
     * - if the address is an email address, leave it as is.
     * - if the address can be parsed into a valid MMS phone number, return the parsed number.
     * - if the address is a compliant alias address, leave it as is.
     */
    public static String parseMmsAddress(String address) {
        // if it's a valid Email address, use that.
        if (Mms.isEmailAddress(address)) {
            return address;
        }

        // if we are able to parse the address to a MMS compliant phone number, take that.
        String retVal = parsePhoneNumberForMms(address);
        if (retVal != null) {
            return retVal;
        }

        // if it's an alias compliant address, use that.
        if (isAlias(address)) {
            return address;
        }

        // it's not a valid MMS address, return null
        return null;
    }

    private static void log(String msg) {
        Log.d(TAG, "[MsgUtils] " + msg);
    }
}