/*
    * junixsocket
    *
    * Copyright 2009-2024 Christian Kohlschütter
    *
    * 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 org.newsclub.net.unix.demo;
  
  import java.io.DataInputStream;
  import java.io.DataOutputStream;
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.net.SocketException;
  import java.nio.charset.StandardCharsets;
  
  import org.newsclub.net.unix.AFUNIXSocket;
  import org.newsclub.net.unix.AFUNIXSocketAddress;
  
  /**
   * A simple demo client.
   *
   * Reads a server greeting string, then sends a "Hello Server" string as a response.
   *
   * Finally, reads integers (via {@link DataInputStream}), then sends twice the sent value each,
   * unless a "-123" magic number is read to indicate the end of the conversation.
   *
   * @author Christian Kohlschütter
   * @see SimpleTestServer
   */
  public class SimpleTestClient {
    public static void main(String[] args) throws IOException {
      final File socketFile = new File(new File(System.getProperty("java.io.tmpdir")),
          "junixsocket-test.sock");
  
      boolean connected = false;
      try (AFUNIXSocket sock = AFUNIXSocket.connectTo(AFUNIXSocketAddress.of(socketFile));
          InputStream is = sock.getInputStream(); //
          OutputStream os = sock.getOutputStream();
          DataInputStream din = new DataInputStream(is);
          DataOutputStream dout = new DataOutputStream(os);) {
        System.out.println("Connected");
        connected = true;
  
        byte[] buf = new byte[128];
  
        int read = is.read(buf);
        System.out.println("Server says: " + new String(buf, 0, read, StandardCharsets.UTF_8));
  
        System.out.println("Replying to server...");
        os.write("Hello Server".getBytes(StandardCharsets.UTF_8));
        os.flush();
  
        System.out.println("Now reading numbers from the server...");
        while (!Thread.interrupted()) {
          int number = din.readInt();
          if (number == -123) {
            // by convention of this demo, if the number is -123, we stop.
            // If we don't do this, we'll get an EOFException upon the next unsuccessful read.
            break;
          }
          System.out.println(number);
  
          int ourNumber = number * 2;
  
          System.out.println("Sending back " + ourNumber);
          dout.writeInt(ourNumber);
        }
      } catch (SocketException e) {
        if (!connected) {
          System.out.println("Cannot connect to server. Have you started it?");
          System.out.println();
        }
        throw e;
      }
  
      System.out.println("End of communication.");
    }
  }