/*
 * Copyright (C) 2006 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.internal.telephony.gsm;

import android.app.Activity;
import android.app.PendingIntent;
import android.app.PendingIntent.CanceledException;
import android.content.Intent;
import android.os.AsyncResult;
import android.os.Message;
import android.provider.Telephony.Sms.Intents;
import android.telephony.ServiceState;
import android.util.Config;
import android.util.Log;

import com.android.internal.telephony.IccUtils;
import com.android.internal.telephony.SmsMessageBase.TextEncodingDetails;
import com.android.internal.telephony.gsm.SmsMessage;
import com.android.internal.telephony.CommandsInterface;
import com.android.internal.telephony.SMSDispatcher;
import com.android.internal.telephony.SmsHeader;
import com.android.internal.telephony.SmsMessageBase;

import java.util.ArrayList;
import java.util.HashMap;

import static android.telephony.SmsMessage.MessageClass;

final class GsmSMSDispatcher extends SMSDispatcher {
    private static final String TAG = "GSM";

    private GSMPhone mGsmPhone;

    GsmSMSDispatcher(GSMPhone phone) {
        super(phone);
        mGsmPhone = phone;
    }

    /**
     * Called when a status report is received.  This should correspond to
     * a previously successful SEND.
     *
     * @param ar AsyncResult passed into the message handler.  ar.result should
     *           be a String representing the status report PDU, as ASCII hex.
     */
    protected void handleStatusReport(AsyncResult ar) {
        String pduString = (String) ar.result;
        SmsMessage sms = SmsMessage.newFromCDS(pduString);

        if (sms != null) {
            int messageRef = sms.messageRef;
            for (int i = 0, count = deliveryPendingList.size(); i < count; i++) {
                SmsTracker tracker = deliveryPendingList.get(i);
                if (tracker.mMessageRef == messageRef) {
                    // Found it.  Remove from list and broadcast.
                    deliveryPendingList.remove(i);
                    PendingIntent intent = tracker.mDeliveryIntent;
                    Intent fillIn = new Intent();
                    fillIn.putExtra("pdu", IccUtils.hexStringToBytes(pduString));
                    try {
                        intent.send(mContext, Activity.RESULT_OK, fillIn);
                    } catch (CanceledException ex) {}

                    // Only expect to see one tracker matching this messageref
                    break;
                }
            }
        }
        acknowledgeLastIncomingSms(true, Intents.RESULT_SMS_HANDLED, null);
    }


    /** {@inheritDoc} */
    protected int dispatchMessage(SmsMessageBase smsb) {

        // If sms is null, means there was a parsing error.
        if (smsb == null) {
            return Intents.RESULT_SMS_GENERIC_ERROR;
        }
        SmsMessage sms = (SmsMessage) smsb;
        boolean handled = false;

        if (sms.isTypeZero()) {
            // As per 3GPP TS 23.040 9.2.3.9, Type Zero messages should not be
            // Displayed/Stored/Notified. They should only be acknowledged.
            Log.d(TAG, "Received short message type 0, Dont display or store it. Send Ack");
            return Intents.RESULT_SMS_HANDLED;
        }

        // Special case the message waiting indicator messages
        if (sms.isMWISetMessage()) {
            mGsmPhone.updateMessageWaitingIndicator(true);
            handled |= sms.isMwiDontStore();
            if (Config.LOGD) {
                Log.d(TAG, "Received voice mail indicator set SMS shouldStore=" + !handled);
            }
        } else if (sms.isMWIClearMessage()) {
            mGsmPhone.updateMessageWaitingIndicator(false);
            handled |= sms.isMwiDontStore();
            if (Config.LOGD) {
                Log.d(TAG, "Received voice mail indicator clear SMS shouldStore=" + !handled);
            }
        }

        if (handled) {
            return Intents.RESULT_SMS_HANDLED;
        }

        if (!mStorageAvailable && (sms.getMessageClass() != MessageClass.CLASS_0)) {
            // It's a storable message and there's no storage available.  Bail.
            // (See TS 23.038 for a description of class 0 messages.)
            return Intents.RESULT_SMS_OUT_OF_MEMORY;
        }

        SmsHeader smsHeader = sms.getUserDataHeader();
         // See if message is partial or port addressed.
        if ((smsHeader == null) || (smsHeader.concatRef == null)) {
            // Message is not partial (not part of concatenated sequence).
            byte[][] pdus = new byte[1][];
            pdus[0] = sms.getPdu();

            if (smsHeader != null && smsHeader.portAddrs != null) {
                if (smsHeader.portAddrs.destPort == SmsHeader.PORT_WAP_PUSH) {
                    return mWapPush.dispatchWapPdu(sms.getUserData());
                } else {
                    // The message was sent to a port, so concoct a URI for it.
                    dispatchPortAddressedPdus(pdus, smsHeader.portAddrs.destPort);
                }
            } else {
                // Normal short and non-port-addressed message, dispatch it.
                dispatchPdus(pdus);
            }
            return Activity.RESULT_OK;
        } else {
            // Process the message part.
            return processMessagePart(sms, smsHeader.concatRef, smsHeader.portAddrs);
        }
    }

    /** {@inheritDoc} */
    protected void sendData(String destAddr, String scAddr, int destPort,
            byte[] data, PendingIntent sentIntent, PendingIntent deliveryIntent) {
        SmsMessage.SubmitPdu pdu = SmsMessage.getSubmitPdu(
                scAddr, destAddr, destPort, data, (deliveryIntent != null));
        sendRawPdu(pdu.encodedScAddress, pdu.encodedMessage, sentIntent, deliveryIntent);
    }

    /** {@inheritDoc} */
    protected void sendText(String destAddr, String scAddr, String text,
            PendingIntent sentIntent, PendingIntent deliveryIntent) {
        SmsMessage.SubmitPdu pdu = SmsMessage.getSubmitPdu(
                scAddr, destAddr, text, (deliveryIntent != null));
        sendRawPdu(pdu.encodedScAddress, pdu.encodedMessage, sentIntent, deliveryIntent);
    }

    /** {@inheritDoc} */
    protected void sendMultipartText(String destinationAddress, String scAddress,
            ArrayList<String> parts, ArrayList<PendingIntent> sentIntents,
            ArrayList<PendingIntent> deliveryIntents) {

        int refNumber = getNextConcatenatedRef() & 0x00FF;
        int msgCount = parts.size();
        int encoding = android.telephony.SmsMessage.ENCODING_UNKNOWN;

        for (int i = 0; i < msgCount; i++) {
            TextEncodingDetails details = SmsMessage.calculateLength(parts.get(i), false);
            if (encoding != details.codeUnitSize
                    && (encoding == android.telephony.SmsMessage.ENCODING_UNKNOWN
                            || encoding == android.telephony.SmsMessage.ENCODING_7BIT)) {
                encoding = details.codeUnitSize;
            }
        }

        for (int i = 0; i < msgCount; i++) {
            SmsHeader.ConcatRef concatRef = new SmsHeader.ConcatRef();
            concatRef.refNumber = refNumber;
            concatRef.seqNumber = i + 1;  // 1-based sequence
            concatRef.msgCount = msgCount;
            // TODO: We currently set this to true since our messaging app will never
            // send more than 255 parts (it converts the message to MMS well before that).
            // However, we should support 3rd party messaging apps that might need 16-bit
            // references
            // Note:  It's not sufficient to just flip this bit to true; it will have
            // ripple effects (several calculations assume 8-bit ref).
            concatRef.isEightBits = true;
            SmsHeader smsHeader = new SmsHeader();
            smsHeader.concatRef = concatRef;

            PendingIntent sentIntent = null;
            if (sentIntents != null && sentIntents.size() > i) {
                sentIntent = sentIntents.get(i);
            }

            PendingIntent deliveryIntent = null;
            if (deliveryIntents != null && deliveryIntents.size() > i) {
                deliveryIntent = deliveryIntents.get(i);
            }

            SmsMessage.SubmitPdu pdus = SmsMessage.getSubmitPdu(scAddress, destinationAddress,
                    parts.get(i), deliveryIntent != null, SmsHeader.toByteArray(smsHeader),
                    encoding);

            sendRawPdu(pdus.encodedScAddress, pdus.encodedMessage, sentIntent, deliveryIntent);
        }
    }

    /**
     * Send a multi-part text based SMS which already passed SMS control check.
     *
     * It is the working function for sendMultipartText().
     *
     * @param destinationAddress the address to send the message to
     * @param scAddress is the service center address or null to use
     *   the current default SMSC
     * @param parts an <code>ArrayList</code> of strings that, in order,
     *   comprise the original message
     * @param sentIntents if not null, an <code>ArrayList</code> of
     *   <code>PendingIntent</code>s (one for each message part) that is
     *   broadcast when the corresponding message part has been sent.
     *   The result code will be <code>Activity.RESULT_OK<code> for success,
     *   or one of these errors:
     *   <code>RESULT_ERROR_GENERIC_FAILURE</code>
     *   <code>RESULT_ERROR_RADIO_OFF</code>
     *   <code>RESULT_ERROR_NULL_PDU</code>.
     * @param deliveryIntents if not null, an <code>ArrayList</code> of
     *   <code>PendingIntent</code>s (one for each message part) that is
     *   broadcast when the corresponding message part has been delivered
     *   to the recipient.  The raw pdu of the status report is in the
     *   extended data ("pdu").
     */
    private void sendMultipartTextWithPermit(String destinationAddress,
            String scAddress, ArrayList<String> parts,
            ArrayList<PendingIntent> sentIntents,
            ArrayList<PendingIntent> deliveryIntents) {

        // check if in service
        int ss = mPhone.getServiceState().getState();
        if (ss != ServiceState.STATE_IN_SERVICE) {
            for (int i = 0, count = parts.size(); i < count; i++) {
                PendingIntent sentIntent = null;
                if (sentIntents != null && sentIntents.size() > i) {
                    sentIntent = sentIntents.get(i);
                }
                SmsTracker tracker = SmsTrackerFactory(null, sentIntent, null);
                handleNotInService(ss, tracker);
            }
            return;
        }

        int refNumber = getNextConcatenatedRef() & 0x00FF;
        int msgCount = parts.size();
        int encoding = android.telephony.SmsMessage.ENCODING_UNKNOWN;

        for (int i = 0; i < msgCount; i++) {
            TextEncodingDetails details = SmsMessage.calculateLength(parts.get(i), false);
            if (encoding != details.codeUnitSize
                    && (encoding == android.telephony.SmsMessage.ENCODING_UNKNOWN
                            || encoding == android.telephony.SmsMessage.ENCODING_7BIT)) {
                encoding = details.codeUnitSize;
            }
        }

        for (int i = 0; i < msgCount; i++) {
            SmsHeader.ConcatRef concatRef = new SmsHeader.ConcatRef();
            concatRef.refNumber = refNumber;
            concatRef.seqNumber = i + 1;  // 1-based sequence
            concatRef.msgCount = msgCount;
            concatRef.isEightBits = false;
            SmsHeader smsHeader = new SmsHeader();
            smsHeader.concatRef = concatRef;

            PendingIntent sentIntent = null;
            if (sentIntents != null && sentIntents.size() > i) {
                sentIntent = sentIntents.get(i);
            }

            PendingIntent deliveryIntent = null;
            if (deliveryIntents != null && deliveryIntents.size() > i) {
                deliveryIntent = deliveryIntents.get(i);
            }

            SmsMessage.SubmitPdu pdus = SmsMessage.getSubmitPdu(scAddress, destinationAddress,
                    parts.get(i), deliveryIntent != null, SmsHeader.toByteArray(smsHeader),
                    encoding);

            HashMap<String, Object> map = new HashMap<String, Object>();
            map.put("smsc", pdus.encodedScAddress);
            map.put("pdu", pdus.encodedMessage);

            SmsTracker tracker =  SmsTrackerFactory(map, sentIntent, deliveryIntent);
            sendSms(tracker);
        }
    }

    /** {@inheritDoc} */
    protected void sendSms(SmsTracker tracker) {
        HashMap map = tracker.mData;

        byte smsc[] = (byte[]) map.get("smsc");
        byte pdu[] = (byte[]) map.get("pdu");

        Message reply = obtainMessage(EVENT_SEND_SMS_COMPLETE, tracker);
        mCm.sendSMS(IccUtils.bytesToHexString(smsc),
                IccUtils.bytesToHexString(pdu), reply);
    }

    /**
     * Send the multi-part SMS based on multipart Sms tracker
     *
     * @param tracker holds the multipart Sms tracker ready to be sent
     */
    protected void sendMultipartSms (SmsTracker tracker) {
        ArrayList<String> parts;
        ArrayList<PendingIntent> sentIntents;
        ArrayList<PendingIntent> deliveryIntents;

        HashMap map = tracker.mData;

        String destinationAddress = (String) map.get("destination");
        String scAddress = (String) map.get("scaddress");

        parts = (ArrayList<String>) map.get("parts");
        sentIntents = (ArrayList<PendingIntent>) map.get("sentIntents");
        deliveryIntents = (ArrayList<PendingIntent>) map.get("deliveryIntents");

        sendMultipartTextWithPermit(destinationAddress,
                scAddress, parts, sentIntents, deliveryIntents);

    }

    /** {@inheritDoc} */
    protected void acknowledgeLastIncomingSms(boolean success, int result, Message response){
        // FIXME unit test leaves cm == null. this should change
        if (mCm != null) {
            mCm.acknowledgeLastIncomingGsmSms(success, resultToCause(result), response);
        }
    }

    /** {@inheritDoc} */
    protected void activateCellBroadcastSms(int activate, Message response) {
        // Unless CBS is implemented for GSM, this point should be unreachable.
        Log.e(TAG, "Error! The functionality cell broadcast sms is not implemented for GSM.");
        response.recycle();
    }

    /** {@inheritDoc} */
    protected void getCellBroadcastSmsConfig(Message response){
        // Unless CBS is implemented for GSM, this point should be unreachable.
        Log.e(TAG, "Error! The functionality cell broadcast sms is not implemented for GSM.");
        response.recycle();
    }

    /** {@inheritDoc} */
    protected  void setCellBroadcastConfig(int[] configValuesArray, Message response) {
        // Unless CBS is implemented for GSM, this point should be unreachable.
        Log.e(TAG, "Error! The functionality cell broadcast sms is not implemented for GSM.");
        response.recycle();
    }

    private int resultToCause(int rc) {
        switch (rc) {
            case Activity.RESULT_OK:
            case Intents.RESULT_SMS_HANDLED:
                // Cause code is ignored on success.
                return 0;
            case Intents.RESULT_SMS_OUT_OF_MEMORY:
                return CommandsInterface.GSM_SMS_FAIL_CAUSE_MEMORY_CAPACITY_EXCEEDED;
            case Intents.RESULT_SMS_GENERIC_ERROR:
            default:
                return CommandsInterface.GSM_SMS_FAIL_CAUSE_UNSPECIFIED_ERROR;
        }
    }
}