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/*
 * Copyright 2013 Objectos, Fábrica de Software LTDA.
 *
 * 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 br.com.objectos.rio.core.os;

import static com.google.common.collect.Lists.newArrayList;

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.util.List;

import com.google.common.base.Charsets;
import com.google.common.collect.ImmutableList;
import com.google.common.io.CharStreams;

/**
 * @author [email protected] (Marcio Endo)
 */
class ChrootProcSuccess extends ChrootProc {

  private final Process process;

  private final List exceptions = newArrayList();

  public ChrootProcSuccess(Process process, List cmds) {
    super(cmds);
    this.process = process;
  }

  @Override
  List getExceptions() {
    return exceptions;
  }

  @Override
  ChrootExec exec() {
    AsyncStdout stdout = AsyncStdout.of(process);
    stdout.start();

    OutputStream os = process.getOutputStream();

    try {

      ChrootExec exec = tryToExec(os, cmds);
      process.waitFor();
      return exec;

    } catch (IOException e) {

      return new ChrootExecFailed(this, e);

    } catch (InterruptedException e) {

      return new ChrootExecFailed(this, e);

    } finally {

      stdout.stop();

      try {
        os.close();
      } catch (IOException e) {
        exceptions.add(e);
      }

    }
  }

  @Override
  List stderr() {
    InputStream is = process.getErrorStream();
    return readStream(is);
  }

  @Override
  List stdout() {
    InputStream is = process.getInputStream();
    return readStream(is);
  }

  @Override
  void destroy() {
    process.destroy();
  }

  private List readStream(InputStream is) {
    try {

      InputStreamReader reader = new InputStreamReader(is);
      List log = CharStreams.readLines(reader);
      return ImmutableList.copyOf(log);

    } catch (IOException e) {

      exceptions.add(e);
      return ImmutableList.of();

    } finally {
      try {
        is.close();
      } catch (IOException e) {
        exceptions.add(e);
      }
    }
  }

  private ChrootExec tryToExec(OutputStream os, List cmds) throws IOException {
    OutputStreamWriter outWriter = new OutputStreamWriter(os, Charsets.UTF_8);
    BufferedWriter writer = new BufferedWriter(outWriter);

    for (String cmd : cmds) {
      writer.write(cmd);
      writer.newLine();
      writer.flush();
    }

    return new ChrootExecSuccess(this);
  }

}