/*
 * Copyright (C) 2015 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.voicemail.impl.sms;

import android.app.PendingIntent;
import android.content.Context;
import android.support.annotation.Nullable;
import android.telecom.PhoneAccountHandle;
import android.text.TextUtils;
import com.android.voicemail.impl.OmtpConstants;

/** A implementation of the OmtpMessageSender using the standard OMTP sms protocol. */
public class OmtpStandardMessageSender extends OmtpMessageSender {
  private final String clientType;
  private final String protocolVersion;
  private final String clientPrefix;

  /**
   * Creates a new instance of OmtpStandardMessageSender.
   *
   * @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(
      Context context,
      PhoneAccountHandle phoneAccountHandle,
      short applicationPort,
      String destinationNumber,
      String clientType,
      String protocolVersion,
      String clientPrefix) {
    super(context, phoneAccountHandle, applicationPort, destinationNumber);
    this.clientType = clientType;
    this.protocolVersion = protocolVersion;
    this.clientPrefix = 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(protocolVersion, OmtpConstants.PROTOCOL_VERSION1_2)
        || TextUtils.equals(protocolVersion, 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(protocolVersion, 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, protocolVersion);
    sb.append(OmtpConstants.SMS_FIELD_SEPARATOR);
    appendField(sb, OmtpConstants.CLIENT_TYPE, clientType);
  }

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

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