/*
 * Copyright (c) 2010 SimpleServer authors (see CONTRIBUTORS)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package simpleserver.thread;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.NoSuchElementException;
import java.util.Scanner;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;

public class SystemInputQueue {
  private final BlockingQueue<String> queue;
  private final BufferedReader input;
  private final Scanner scanner;
  private final Reader reader;

  private final boolean isWindows;

  private volatile boolean run = true;

  public SystemInputQueue() {
    queue = new LinkedBlockingQueue<String>();
    input = new BufferedReader(new InputStreamReader(System.in));
    scanner = new Scanner(input);

    if (System.getProperty("os.name").toLowerCase().contains("win")) {
      isWindows = true;
    } else {
      isWindows = false;
    }

    reader = new Reader();
    reader.start();
    reader.setName("SystemInputQueue");
  }

  public String nextLine() throws InterruptedException {
    return queue.take();
  }

  public void appendLine(String line) {
    queue.add(line);
  }

  public void stop() {
    run = false;
    reader.interrupt();
  }

  private final class Reader extends Thread {
    @Override
    public void run() {
      StringBuilder builder = new StringBuilder();
      while (run) {

        if (!isWindows) { // Running NOT on windows plattform
          try {
            builder.setLength(0);
            while (input.ready()) {
              int character = input.read();
              if (character == -1) {
                run = false;
                break;
              } else if ((char) character != '\n') {
                builder.append((char) character);
              } else {
                String line = builder.toString();
                builder.setLength(0);

                if (line.endsWith("\r")) {
                  line = line.substring(0, line.length() - 1);
                }

                try {
                  queue.put(line);
                } catch (InterruptedException e) {
                  continue;
                }
              }
            }
          } catch (IOException e) {
            break;
          }
        } else { // Running on windows -> use other read method!
          try {
            String line = scanner.nextLine();
            queue.put(line);
          } catch (InterruptedException e) {
            continue;
          } catch (NoSuchElementException e) {
            continue;
          }
        }

        try {
          Thread.sleep(50);
        } catch (InterruptedException e) {
        }
      }
    }
  }
}