/*
 * 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.voicemailomtp.sms;

import android.app.PendingIntent;
import android.content.Context;
import android.support.annotation.Nullable;
import android.telecom.PhoneAccountHandle;
import android.telephony.SmsManager;
import android.telephony.VisualVoicemailService;
import com.android.voicemailomtp.OmtpConstants;
import com.android.voicemailomtp.TelephonyManagerStub;
import com.android.voicemailomtp.VvmLog;
import java.io.UnsupportedEncodingException;
import java.util.Locale;

/**
 * Send client originated OMTP messages to the OMTP server.
 * <p>
 * Uses {@link PendingIntent} instead of a call back to notify when the message is
 * sent. This is primarily to keep the implementation simple and reuse what the underlying
 * {@link SmsManager} interface provides.
 * <p>
 * Provides simple APIs to send different types of mobile originated OMTP SMS to the VVM server.
 */
public abstract class OmtpMessageSender {
    protected static final String TAG = "OmtpMessageSender";
    protected final Context mContext;
    protected final PhoneAccountHandle mPhoneAccountHandle;
    protected final short mApplicationPort;
    protected final String mDestinationNumber;


    public OmtpMessageSender(Context context, PhoneAccountHandle phoneAccountHandle,
            short applicationPort,
            String destinationNumber) {
        mContext = context;
        mPhoneAccountHandle = phoneAccountHandle;
        mApplicationPort = applicationPort;
        mDestinationNumber = destinationNumber;
    }

    /**
     * Sends a request to the VVM server to activate VVM for the current subscriber.
     *
     * @param sentIntent If not NULL this PendingIntent is broadcast when the message is
     *            successfully sent, or failed.
     */
    public void requestVvmActivation(@Nullable PendingIntent sentIntent) {}

    /**
     * Sends a request to the VVM server to deactivate VVM for the current subscriber.
     *
     * @param sentIntent If not NULL this PendingIntent is broadcast when the message is
     *            successfully sent, or failed.
     */
    public void requestVvmDeactivation(@Nullable PendingIntent sentIntent) {}

    /**
     * Send a request to the VVM server to get account status of the current subscriber.
     *
     * @param sentIntent If not NULL this PendingIntent is broadcast when the message is
     *            successfully sent, or failed.
     */
    public void requestVvmStatus(@Nullable PendingIntent sentIntent) {}

    protected void sendSms(String text, PendingIntent sentIntent) {
        VisualVoicemailService
                .sendVisualVoicemailSms(mContext, mPhoneAccountHandle, mDestinationNumber,
                        mApplicationPort, text, sentIntent);
    }

    protected void appendField(StringBuilder sb, String field, Object value) {
        sb.append(field).append(OmtpConstants.SMS_KEY_VALUE_SEPARATOR).append(value);
    }
}