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package org.graphwalker.io.common;

/*
 * #%L
 * GraphWalker Input/Output
 * %%
 * Copyright (C) 2005 - 2014 GraphWalker
 * %%
 * 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.
 * #L%
 */

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.net.URISyntaxException;
import java.net.URL;
import java.nio.file.Path;
import java.nio.file.Paths;

/**
 * @author Nils Olsson
 */
public final class ResourceUtils {

  private static final Logger logger = LoggerFactory.getLogger(ResourceUtils.class);

  private ResourceUtils() {
  }

  public static File getResourceAsFile(final String filename) {
    File file = new File(filename);
    if (file != null && file.exists()) {
      return file;
    } else {
      URL resource = ResourceUtils.class.getResource(filename);
      if (null == resource) {
        resource = Thread.currentThread().getContextClassLoader().getResource(filename);
      }
      if (null != resource) {
        try {
          return Paths.get(resource.toURI()).toFile();
        } catch (URISyntaxException e) {
          throw new ResourceNotFoundException("Could not read resource: " + filename + ", " + e.getMessage());
        }
      }
      throw new ResourceNotFoundException("Could not read resource: " + filename);
    }
  }

  public static InputStream getResourceAsStream(final String filename) {
    File file = new File(filename);
    if (file != null && file.exists()) {
      try {
        return new FileInputStream(file);
      } catch (FileNotFoundException e) {
        logger.error(e.getMessage());
        throw new ResourceNotFoundException("Could not read file: " + filename);
      }
    } else {
      InputStream resource = ResourceUtils.class.getResourceAsStream(filename);
      if (null == resource) {
        resource = Thread.currentThread().getContextClassLoader().getResourceAsStream(filename);
      }
      if (null != resource) {
        return resource;
      }
      throw new ResourceNotFoundException("Could not read resource: " + filename);
    }
  }

  public static boolean isDirectory(Path path) {
    File file = path.toFile();
    return (file != null && file.isDirectory());
  }
}