/*
 * Copyright (C) 2007-2008 Esmertec AG.
 * Copyright (C) 2007-2008 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.transaction;

import static android.content.Intent.ACTION_BOOT_COMPLETED;
import static android.provider.Telephony.Sms.Intents.SMS_RECEIVED_ACTION;



import com.android.mms.MmsApp;
import com.android.mms.ui.ClassZeroActivity;
import com.android.mms.util.SendingProgressTokenManager;
import com.google.android.mms.MmsException;
import com.google.android.mms.util.SqliteWrapper;

import android.app.Activity;
import android.app.Service;
import android.content.ContentResolver;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.IBinder;
import android.os.Looper;
import android.os.Message;
import android.os.Process;
import android.provider.Telephony.Sms;
import android.provider.Telephony.Sms.Inbox;
import android.provider.Telephony.Sms.Intents;
import android.provider.Telephony.Sms.Outbox;
import android.telephony.ServiceState;
import android.telephony.SmsManager;
import android.telephony.SmsMessage;
import android.util.Log;
import android.widget.Toast;

import com.android.internal.telephony.TelephonyIntents;
import com.android.mms.R;
import com.android.mms.ui.ClassZeroActivity;
import com.android.mms.util.SendingProgressTokenManager;
import com.google.android.mms.MmsException;
import com.google.android.mms.util.SqliteWrapper;

/**
 * This service essentially plays the role of a "worker thread", allowing us to store
 * incoming messages to the database, update notifications, etc. without blocking the
 * main thread that SmsReceiver runs on.
 */
public class SmsReceiverService extends Service {
    private static final String TAG = "SmsReceiverService";

    private ServiceHandler mServiceHandler;
    private Looper mServiceLooper;

    public static final String MESSAGE_SENT_ACTION =
        "com.android.mms.transaction.MESSAGE_SENT";

    // This must match the column IDs below.
    private static final String[] SEND_PROJECTION = new String[] {
        Sms._ID,        //0
        Sms.THREAD_ID,  //1
        Sms.ADDRESS,    //2
        Sms.BODY,       //3

    };

    public Handler mToastHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            Toast.makeText(SmsReceiverService.this, getString(R.string.message_queued),
                    Toast.LENGTH_SHORT).show();
        }
    };

    // This must match SEND_PROJECTION.
    private static final int SEND_COLUMN_ID         = 0;
    private static final int SEND_COLUMN_THREAD_ID  = 1;
    private static final int SEND_COLUMN_ADDRESS    = 2;
    private static final int SEND_COLUMN_BODY       = 3;

    private int mResultCode;

    @Override
    public void onCreate() {
        if (Log.isLoggable(MmsApp.LOG_TAG, Log.VERBOSE)) {
            Log.v(TAG, "onCreate");
        }

        // Start up the thread running the service.  Note that we create a
        // separate thread because the service normally runs in the process's
        // main thread, which we don't want to block.
        HandlerThread thread = new HandlerThread(TAG, Process.THREAD_PRIORITY_BACKGROUND);
        thread.start();

        mServiceLooper = thread.getLooper();
        mServiceHandler = new ServiceHandler(mServiceLooper);
    }

    @Override
    public void onStart(Intent intent, int startId) {
        if (Log.isLoggable(MmsApp.LOG_TAG, Log.VERBOSE)) {
            Log.v(TAG, "onStart: #" + startId + ": " + intent.getExtras());
        }

        mResultCode = intent.getIntExtra("result", 0);

        Message msg = mServiceHandler.obtainMessage();
        msg.arg1 = startId;
        msg.obj = intent;
        mServiceHandler.sendMessage(msg);
    }

    @Override
    public void onDestroy() {
        if (Log.isLoggable(MmsApp.LOG_TAG, Log.VERBOSE)) {
            Log.v(TAG, "onDestroy");
        }
        mServiceLooper.quit();
    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    private final class ServiceHandler extends Handler {
        public ServiceHandler(Looper looper) {
            super(looper);
        }

        /**
         * Handle incoming transaction requests.
         * The incoming requests are initiated by the MMSC Server or by the
         * MMS Client itself.
         */
        @Override
        public void handleMessage(Message msg) {
            if (Log.isLoggable(MmsApp.LOG_TAG, Log.VERBOSE)) {
                Log.v(TAG, "Handling incoming message: " + msg);
            }
            int serviceId = msg.arg1;
            Intent intent = (Intent)msg.obj;

            String action = intent.getAction();

            if (MESSAGE_SENT_ACTION.equals(intent.getAction())) {
                handleSmsSent(intent);
            } else if (SMS_RECEIVED_ACTION.equals(action)) {
                handleSmsReceived(intent);
            } else if (ACTION_BOOT_COMPLETED.equals(action)) {
                handleBootCompleted();
            } else if (TelephonyIntents.ACTION_SERVICE_STATE_CHANGED.equals(action)) {
                handleServiceStateChanged(intent);
            }

            // NOTE: We MUST not call stopSelf() directly, since we need to
            // make sure the wake lock acquired by AlertReceiver is released.
            SmsReceiver.finishStartingService(SmsReceiverService.this, serviceId);
        }
    }

    private void handleServiceStateChanged(Intent intent) {
        // If service just returned, start sending out the queued messages
        ServiceState serviceState = ServiceState.newFromBundle(intent.getExtras());
        if (serviceState.getState() == ServiceState.STATE_IN_SERVICE) {
            sendFirstQueuedMessage();
        }
    }

    public synchronized void sendFirstQueuedMessage() {
        // get all the queued messages from the database
        final Uri uri = Uri.parse("content://sms/queued");
        ContentResolver resolver = getContentResolver();
        Cursor c = SqliteWrapper.query(this, resolver, uri,
                        SEND_PROJECTION, null, null, null);

        if (c != null) {
            try {
                if (c.moveToFirst()) {
                    int msgId = c.getInt(SEND_COLUMN_ID);
                    String msgText = c.getString(SEND_COLUMN_BODY);
                    String[] address = new String[1];
                    address[0] = c.getString(SEND_COLUMN_ADDRESS);
                    int threadId = c.getInt(SEND_COLUMN_THREAD_ID);

                    SmsMessageSender sender = new SmsMessageSender(this,
                            address, msgText, threadId);
                    try {
                        sender.sendMessage(SendingProgressTokenManager.NO_TOKEN);

                        // Since sendMessage adds a new message to the outbox rather than
                        // moving the old one, the old one must be deleted here
                        Uri msgUri = ContentUris.withAppendedId(Sms.CONTENT_URI, msgId);
                        SqliteWrapper.delete(this, resolver, msgUri, null, null);
                    } catch (MmsException e) {
                        Log.e(TAG, "Failed to send message: " + e);
                    }
                }
            } finally {
                c.close();
            }
        }
    }

    private void handleSmsSent(Intent intent) {
        Uri uri = intent.getData();

        if (mResultCode == Activity.RESULT_OK) {
            Sms.moveMessageToFolder(this, uri, Sms.MESSAGE_TYPE_SENT);
            sendFirstQueuedMessage();

            // Update the notification for failed messages since they
            // may be deleted.
            MessagingNotification.updateSendFailedNotification(
                    this);
        } else if ((mResultCode == SmsManager.RESULT_ERROR_RADIO_OFF) ||
                (mResultCode == SmsManager.RESULT_ERROR_NO_SERVICE)) {
            Sms.moveMessageToFolder(this, uri, Sms.MESSAGE_TYPE_QUEUED);
            mToastHandler.sendEmptyMessage(1);
        } else {
            Sms.moveMessageToFolder(this, uri, Sms.MESSAGE_TYPE_FAILED);
            MessagingNotification.notifySendFailed(getApplicationContext(), true);
            sendFirstQueuedMessage();
        }
    }

    private void handleSmsReceived(Intent intent) {
        SmsMessage[] msgs = Intents.getMessagesFromIntent(intent);
        Uri messageUri = insertMessage(this, msgs);

        if (messageUri != null) {
            MessagingNotification.updateNewMessageIndicator(this, true);
        }
    }

    private void handleBootCompleted() {
        moveOutboxMessagesToQueuedBox();
        sendFirstQueuedMessage();
        MessagingNotification.updateNewMessageIndicator(this);
    }

    private void moveOutboxMessagesToQueuedBox() {
        ContentValues values = new ContentValues(1);

        values.put(Sms.TYPE, Sms.MESSAGE_TYPE_QUEUED);

        SqliteWrapper.update(
                getApplicationContext(), getContentResolver(), Outbox.CONTENT_URI,
                values, "type = " + Sms.MESSAGE_TYPE_OUTBOX, null);
    }

    public static final String CLASS_ZERO_BODY_KEY = "CLASS_ZERO_BODY";

    // This must match the column IDs below.
    private final static String[] REPLACE_PROJECTION = new String[] {
        Sms._ID,
        Sms.ADDRESS,
        Sms.PROTOCOL
    };

    // This must match REPLACE_PROJECTION.
    private static final int REPLACE_COLUMN_ID = 0;

    /**
     * If the message is a class-zero message, display it immediately
     * and return null.  Otherwise, store it using the
     * <code>ContentResolver</code> and return the
     * <code>Uri</code> of the thread containing this message
     * so that we can use it for notification.
     */
    private Uri insertMessage(Context context, SmsMessage[] msgs) {
        // Build the helper classes to parse the messages.
        SmsMessage sms = msgs[0];

        if (sms.getMessageClass() == SmsMessage.MessageClass.CLASS_0) {
            displayClassZeroMessage(context, sms);
            return null;
        } else if (sms.isReplace()) {
            return replaceMessage(context, msgs);
        } else {
            return storeMessage(context, msgs);
        }
    }

    /**
     * This method is used if this is a "replace short message" SMS.
     * We find any existing message that matches the incoming
     * message's originating address and protocol identifier.  If
     * there is one, we replace its fields with those of the new
     * message.  Otherwise, we store the new message as usual.
     *
     * See TS 23.040 9.2.3.9.
     */
    private Uri replaceMessage(Context context, SmsMessage[] msgs) {
        SmsMessage sms = msgs[0];
        ContentValues values = extractContentValues(sms);

        values.put(Inbox.BODY, sms.getMessageBody());

        ContentResolver resolver = context.getContentResolver();
        String originatingAddress = sms.getOriginatingAddress();
        int protocolIdentifier = sms.getProtocolIdentifier();
        String selection =
                Sms.ADDRESS + " = ? AND " +
                Sms.PROTOCOL + " = ?";
        String[] selectionArgs = new String[] {
            originatingAddress, Integer.toString(protocolIdentifier)
        };

        Cursor cursor = SqliteWrapper.query(context, resolver, Inbox.CONTENT_URI,
                            REPLACE_PROJECTION, selection, selectionArgs, null);

        if (cursor != null) {
            try {
                if (cursor.moveToFirst()) {
                    long messageId = cursor.getLong(REPLACE_COLUMN_ID);
                    Uri messageUri = ContentUris.withAppendedId(
                            Sms.CONTENT_URI, messageId);

                    SqliteWrapper.update(context, resolver, messageUri,
                                        values, null, null);
                    return messageUri;
                }
            } finally {
                cursor.close();
            }
        }
        return storeMessage(context, msgs);
    }

    private Uri storeMessage(Context context, SmsMessage[] msgs) {
        SmsMessage sms = msgs[0];

        // Store the message in the content provider.
        ContentValues values = extractContentValues(sms);
        int pduCount = msgs.length;

        if (pduCount == 1) {
            // There is only one part, so grab the body directly.
            values.put(Inbox.BODY, sms.getDisplayMessageBody());
        } else {
            // Build up the body from the parts.
            StringBuilder body = new StringBuilder();
            for (int i = 0; i < pduCount; i++) {
                sms = msgs[i];
                body.append(sms.getDisplayMessageBody());
            }
            values.put(Inbox.BODY, body.toString());
        }

        ContentResolver resolver = context.getContentResolver();

        return SqliteWrapper.insert(context, resolver, Inbox.CONTENT_URI, values);
    }

    /**
     * Extract all the content values except the body from an SMS
     * message.
     */
    private ContentValues extractContentValues(SmsMessage sms) {
        // Store the message in the content provider.
        ContentValues values = new ContentValues();

        values.put(Inbox.ADDRESS, sms.getDisplayOriginatingAddress());

        // Use now for the timestamp to avoid confusion with clock
        // drift between the handset and the SMSC.
        values.put(Inbox.DATE, new Long(System.currentTimeMillis()));
        values.put(Inbox.PROTOCOL, sms.getProtocolIdentifier());
        values.put(Inbox.READ, Integer.valueOf(0));
        if (sms.getPseudoSubject().length() > 0) {
            values.put(Inbox.SUBJECT, sms.getPseudoSubject());
        }
        values.put(Inbox.REPLY_PATH_PRESENT, sms.isReplyPathPresent() ? 1 : 0);
        values.put(Inbox.SERVICE_CENTER, sms.getServiceCenterAddress());
        return values;
    }

    /**
     * Displays a class-zero message immediately in a pop-up window
     * with the number from where it received the Notification with
     * the body of the message
     *
     */
    private void displayClassZeroMessage(Context context, SmsMessage sms) {
        // Using NEW_TASK here is necessary because we're calling
        // startActivity from outside an activity.
        Intent smsDialogIntent = new Intent(context, ClassZeroActivity.class)
                .putExtra(CLASS_ZERO_BODY_KEY, sms.getMessageBody())
                .setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
                          | Intent.FLAG_ACTIVITY_MULTIPLE_TASK);

        context.startActivity(smsDialogIntent);
    }


}