/**
 * $Id$
 * $Date$
 * 
 */

package org.xmlsh.builtin.commands;

import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import org.xmlsh.core.BuiltinCommand;
import org.xmlsh.core.CoreException;
import org.xmlsh.core.InputPort;
import org.xmlsh.core.Options;
import org.xmlsh.core.XValue;
import org.xmlsh.sh.shell.IFS;
import org.xmlsh.sh.shell.SerializeOpts;
import org.xmlsh.util.Util;

public class read extends BuiltinCommand {

  /*
   * Read a line of text from stdin and assign to variables
   */

  @Override
  public int run(List<XValue> args) throws Exception {
    Options opts = new Options("p=prompt:,e", SerializeOpts.getOptionDefs());
    opts.parse(args);
    args = opts.getRemainingArgs();

    // Unset all args
    for(XValue arg : args)
      mShell.getEnv().unsetVar(arg.toString());

    String line = readLine(opts);

    if(line == null)
      return 1; // EOF

    IFS ifs = mShell.getIFS();

    List<String> results = ifs.split(line);
    int i;
    for(i = 0; i < args.size() - 1; i++)
      if(i < results.size())
        mShell.getEnv().setVar(args.get(i).toString(),
            XValue.newXValue(results.get(i)));

    // last var
    if(i < args.size() && i < results.size()) {
      // 1 left
      if(results.size() == 1)
        mShell.getEnv().setVar(args.get(i).toString(),
            XValue.newXValue(results.get(i)));
      else {
        int n = results.size() - i;
        String[] remaining = results.subList(i, results.size())
            .toArray(new String[n]);
        mShell.getEnv().setVar(args.get(i).toString(),
            XValue.newXValue(remaining));
      }

    }

    return 0;
  }

  private String readLine(Options opts) throws IOException, CoreException {

    if(opts.hasOpt("e") || opts.hasOpt("prompt")) {
      String prompt = opts.getOptString("prompt", "");
      return mShell.readCommandLine(prompt);
    }

    InputPort stdin = mShell.getEnv().getStdin();
    String line = null;

    try (InputStream is = stdin.asInputStream(getSerializeOpts())) {
      try {
        line = Util.readLine(is, getSerializeOpts()
            .getInputTextEncoding());
      } catch (IOException e) {
        mLogger.debug("Caught IOException in read - treating as EOF", e);
        line = null;
      }
    }
    return line;
  }

}
//
//
// Copyright (C) 2008-2014 David A. Lee.
//
// The contents of this file are subject to the "Simplified BSD License" (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.opensource.org/licenses/bsd-license.php
//
// Software distributed under the License is distributed on an "AS IS" basis,
// WITHOUT WARRANTY OF ANY KIND, either express or implied.
// See the License for the specific language governing rights and limitations
// under the License.
//
// The Original Code is: all this file.
//
// The Initial Developer of the Original Code is David A. Lee
//
// Portions created by (your name) are Copyright (C) (your legal entity). All
// Rights Reserved.
//
// Contributor(s): none.
//