/*
 * Copyright (C) 2015 Google Inc. All Rights Reserved.
 *
 * 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.phone.vvm.omtp.sms;

import android.annotation.Nullable;
import android.app.PendingIntent;
import android.telephony.SmsManager;
import android.text.TextUtils;

import com.android.phone.vvm.omtp.OmtpConstants;

/**
 * A implementation of the OmtpMessageSender using the standard OMTP sms protocol.
 */
public class OmtpStandardMessageSender extends OmtpMessageSender {
    private final String mClientType;
    private final String mProtocolVersion;
    private final String mClientPrefix;

    /**
     * Creates a new instance of OmtpStandardMessageSender.
     *
     * @param smsManager SMS sending library. There is a different SmsManager for each SIM.
     * @param applicationPort If set to a value > 0 then a binary sms is sent to this port number.
     *            Otherwise, a standard text SMS is sent.
     * @param destinationNumber Destination number to be used.
     * @param clientType The "ct" field to be set in the MO message. This is the value used by the
     *            VVM server to identify the client. Certain VVM servers require a specific agreed
     *            value for this field.
     * @param protocolVersion OMTP protocol version.
     * @param clientPrefix The client prefix requested to be used by the server in its MT messages.
     */
    public OmtpStandardMessageSender(SmsManager smsManager, short applicationPort,
            String destinationNumber, String clientType, String protocolVersion,
            String clientPrefix) {
        super(smsManager, applicationPort, destinationNumber);
        mClientType = clientType;
        mProtocolVersion = protocolVersion;
        mClientPrefix = clientPrefix;
    }

    // Activate message:
    // V1.1: Activate:pv=<value>;ct=<value>
    // V1.2: Activate:pv=<value>;ct=<value>;pt=<value>;<Clientprefix>
    // V1.3: Activate:pv=<value>;ct=<value>;pt=<value>;<Clientprefix>
    @Override
    public void requestVvmActivation(@Nullable PendingIntent sentIntent) {
        StringBuilder sb = new StringBuilder().append(OmtpConstants.ACTIVATE_REQUEST);

        appendProtocolVersionAndClientType(sb);
        if (TextUtils.equals(mProtocolVersion, OmtpConstants.PROTOCOL_VERSION1_2) ||
                TextUtils.equals(mProtocolVersion, OmtpConstants.PROTOCOL_VERSION1_3)) {
            appendApplicationPort(sb);
            appendClientPrefix(sb);
        }

        sendSms(sb.toString(), sentIntent);
    }

    // Deactivate message:
    // V1.1: Deactivate:pv=<value>;ct=<string>
    // V1.2: Deactivate:pv=<value>;ct=<string>
    // V1.3: Deactivate:pv=<value>;ct=<string>
    @Override
    public void requestVvmDeactivation(@Nullable PendingIntent sentIntent) {
        StringBuilder sb = new StringBuilder().append(OmtpConstants.DEACTIVATE_REQUEST);
        appendProtocolVersionAndClientType(sb);

        sendSms(sb.toString(), sentIntent);
    }

    // Status message:
    // V1.1: STATUS
    // V1.2: STATUS
    // V1.3: STATUS:pv=<value>;ct=<value>;pt=<value>;<Clientprefix>
    @Override
    public void requestVvmStatus(@Nullable PendingIntent sentIntent) {
        StringBuilder sb = new StringBuilder().append(OmtpConstants.STATUS_REQUEST);

        if (TextUtils.equals(mProtocolVersion, OmtpConstants.PROTOCOL_VERSION1_3)) {
            appendProtocolVersionAndClientType(sb);
            appendApplicationPort(sb);
            appendClientPrefix(sb);
        }

        sendSms(sb.toString(), sentIntent);
    }

    private void appendProtocolVersionAndClientType(StringBuilder sb) {
        sb.append(OmtpConstants.SMS_PREFIX_SEPARATOR);
        appendField(sb, OmtpConstants.PROTOCOL_VERSION, mProtocolVersion);
        sb.append(OmtpConstants.SMS_FIELD_SEPARATOR);
        appendField(sb, OmtpConstants.CLIENT_TYPE, mClientType);
    }

    private void appendApplicationPort(StringBuilder sb) {
        sb.append(OmtpConstants.SMS_FIELD_SEPARATOR);
        appendField(sb, OmtpConstants.APPLICATION_PORT, mApplicationPort);
    }

    private void appendClientPrefix(StringBuilder sb) {
        sb.append(OmtpConstants.SMS_FIELD_SEPARATOR);
        sb.append(mClientPrefix);
    }
}