/*
 * 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.internal.telephony.cdma;

import android.os.Message;
import android.telephony.Rlog;
import android.telephony.ServiceState;
import android.telephony.TelephonyManager;
import android.util.Pair;

import com.android.internal.telephony.GsmCdmaPhone;
import com.android.internal.telephony.Phone;
import com.android.internal.telephony.PhoneConstants;
import com.android.internal.telephony.SmsConstants;
import com.android.internal.telephony.SMSDispatcher;
import com.android.internal.telephony.SmsDispatchersController;
import com.android.internal.telephony.SmsHeader;
import com.android.internal.telephony.util.SMSDispatcherUtil;
import com.android.internal.telephony.GsmAlphabet.TextEncodingDetails;
import com.android.internal.telephony.SmsMessageBase;


public class CdmaSMSDispatcher extends SMSDispatcher {
    private static final String TAG = "CdmaSMSDispatcher";
    private static final boolean VDBG = false;

    public CdmaSMSDispatcher(Phone phone, SmsDispatchersController smsDispatchersController) {
        super(phone, smsDispatchersController);
        Rlog.d(TAG, "CdmaSMSDispatcher created");
    }

    @Override
    public String getFormat() {
        return SmsConstants.FORMAT_3GPP2;
    }

    /**
     * Send the SMS status report to the dispatcher thread to process.
     * @param sms the CDMA SMS message containing the status report
     */
    public void sendStatusReportMessage(SmsMessage sms) {
        if (VDBG) Rlog.d(TAG, "sending EVENT_HANDLE_STATUS_REPORT message");
        sendMessage(obtainMessage(EVENT_HANDLE_STATUS_REPORT, sms));
    }

    @Override
    protected void handleStatusReport(Object o) {
        if (o instanceof SmsMessage) {
            if (VDBG) Rlog.d(TAG, "calling handleCdmaStatusReport()");
            handleCdmaStatusReport((SmsMessage) o);
        } else {
            Rlog.e(TAG, "handleStatusReport() called for object type " + o.getClass().getName());
        }
    }

    @Override
    protected boolean shouldBlockSmsForEcbm() {
        // We only block outgoing SMS during ECBM when using CDMA.
        return mPhone.isInEcm() && isCdmaMo() && !isIms();
    }

    @Override
    protected SmsMessageBase.SubmitPduBase getSubmitPdu(String scAddr, String destAddr,
            String message, boolean statusReportRequested, SmsHeader smsHeader, int priority,
            int validityPeriod) {
        return SMSDispatcherUtil.getSubmitPduCdma(scAddr, destAddr, message,
                statusReportRequested, smsHeader, priority);
    }

    @Override
    protected SmsMessageBase.SubmitPduBase getSubmitPdu(String scAddr, String destAddr,
            int destPort, byte[] message, boolean statusReportRequested) {
        return SMSDispatcherUtil.getSubmitPduCdma(scAddr, destAddr, destPort, message,
                statusReportRequested);
    }

    @Override
    protected TextEncodingDetails calculateLength(CharSequence messageBody, boolean use7bitOnly) {
        return SMSDispatcherUtil.calculateLengthCdma(messageBody, use7bitOnly);
    }
    /**
     * Called from parent class to handle status report from {@code CdmaInboundSmsHandler}.
     * @param sms the CDMA SMS message to process
     */
    private void handleCdmaStatusReport(SmsMessage sms) {
        for (int i = 0, count = deliveryPendingList.size(); i < count; i++) {
            SmsTracker tracker = deliveryPendingList.get(i);
            if (tracker.mMessageRef == sms.mMessageRef) {
                Pair<Boolean, Boolean> result =
                        mSmsDispatchersController.handleSmsStatusReport(tracker, getFormat(),
                                sms.getPdu());
                if (result.second) {
                    deliveryPendingList.remove(i);
                }
                break;  // Only expect to see one tracker matching this message.
            }
        }
    }

    /** {@inheritDoc} */
    @Override
    public void sendSms(SmsTracker tracker) {
        Rlog.d(TAG, "sendSms: "
                + " isIms()=" + isIms()
                + " mRetryCount=" + tracker.mRetryCount
                + " mImsRetry=" + tracker.mImsRetry
                + " mMessageRef=" + tracker.mMessageRef
                + " mUsesImsServiceForIms=" + tracker.mUsesImsServiceForIms
                + " SS=" + mPhone.getServiceState().getState());

        int ss = mPhone.getServiceState().getState();
        // if sms over IMS is not supported on data and voice is not available...
        if (!isIms() && ss != ServiceState.STATE_IN_SERVICE) {
            tracker.onFailed(mContext, getNotInServiceError(ss), 0/*errorCode*/);
            return;
        }

        Message reply = obtainMessage(EVENT_SEND_SMS_COMPLETE, tracker);
        byte[] pdu = (byte[]) tracker.getData().get("pdu");

        int currentDataNetwork = mPhone.getServiceState().getDataNetworkType();
        boolean imsSmsDisabled = (currentDataNetwork == TelephonyManager.NETWORK_TYPE_EHRPD
                    || (ServiceState.isLte(currentDataNetwork)
                    && !mPhone.getServiceStateTracker().isConcurrentVoiceAndDataAllowed()))
                    && mPhone.getServiceState().getVoiceNetworkType()
                    == TelephonyManager.NETWORK_TYPE_1xRTT
                    && ((GsmCdmaPhone) mPhone).mCT.mState != PhoneConstants.State.IDLE;

        // sms over cdma is used:
        //   if sms over IMS is not supported AND
        //   this is not a retry case after sms over IMS failed
        //     indicated by mImsRetry > 0 OR
        //   SMS over IMS is disabled because of the network type OR
        //   SMS over IMS is being handled by the ImsSmsDispatcher implementation and has indicated
        //   that the message should fall back to sending over CS.
        if (0 == tracker.mImsRetry && !isIms() || imsSmsDisabled || tracker.mUsesImsServiceForIms) {
            mCi.sendCdmaSms(pdu, reply);
        } else {
            mCi.sendImsCdmaSms(pdu, tracker.mImsRetry, tracker.mMessageRef, reply);
            // increment it here, so in case of SMS_FAIL_RETRY over IMS
            // next retry will be sent using IMS request again.
            tracker.mImsRetry++;
        }
    }
}