/**
 * Copyright (c) 2008, SnakeYAML
 *
 * 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.pyyaml;

import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import junit.framework.TestCase;
import org.yaml.snakeyaml.Util;
import org.yaml.snakeyaml.Yaml;
import org.yaml.snakeyaml.constructor.Constructor;
import org.yaml.snakeyaml.events.Event;
import org.yaml.snakeyaml.parser.Parser;
import org.yaml.snakeyaml.parser.ParserImpl;
import org.yaml.snakeyaml.reader.StreamReader;
import org.yaml.snakeyaml.reader.UnicodeReader;

public abstract class PyImportTest extends TestCase {

  public static final String PATH = "pyyaml";

  protected Object load(String data) {
    Yaml yaml = new Yaml();
    return yaml.load(data);
  }

  protected Object load(Constructor loader, String data) {
    Yaml yaml = new Yaml(loader);
    return yaml.load(data);
  }

  protected Iterable<Object> loadAll(InputStream data) {
    Yaml yaml = new Yaml();
    return yaml.loadAll(data);
  }

  protected Iterable<Object> loadAll(String data) {
    Yaml yaml = new Yaml();
    return yaml.loadAll(data);
  }

  protected Iterable<Object> loadAll(Constructor loader, String data) {
    Yaml yaml = new Yaml(loader);
    return yaml.loadAll(data);
  }

  protected String getResource(String theName) {
    return Util.getLocalResource(PATH + File.separator + theName);
  }

  protected File[] getStreamsByExtension(String extention) {
    return getStreamsByExtension(extention, false);
  }

  protected File[] getStreamsByExtension(String extention, boolean onlyIfCanonicalPresent) {
    File file = new File("src/test/resources/pyyaml");
    assertTrue("Folder not found: " + file.getAbsolutePath(), file.exists());
    assertTrue(file.isDirectory());
    return file.listFiles(new PyFilenameFilter(extention, onlyIfCanonicalPresent));
  }

  protected File getFileByName(String name) {
    File file = new File("src/test/resources/pyyaml/" + name);
    assertTrue("Folder not found: " + file.getAbsolutePath(), file.exists());
    assertTrue(file.isFile());
    return file;
  }

  protected List<Event> canonicalParse(InputStream input2) throws IOException {
    StreamReader reader = new StreamReader(new UnicodeReader(input2));
    StringBuilder buffer = new StringBuilder();
    while (reader.peek() != '\0') {
      buffer.appendCodePoint(reader.peek());
      reader.forward();
    }
    CanonicalParser parser =
        new CanonicalParser(buffer.toString().replace(System.lineSeparator(), "\n"));
    List<Event> result = new ArrayList<Event>();
    while (parser.peekEvent() != null) {
      result.add(parser.getEvent());
    }
    input2.close();
    return result;
  }

  protected List<Event> parse(InputStream input) throws IOException {
    StreamReader reader = new StreamReader(new UnicodeReader(input));
    Parser parser = new ParserImpl(reader);
    List<Event> result = new ArrayList<Event>();
    while (parser.peekEvent() != null) {
      result.add(parser.getEvent());
    }
    input.close();
    return result;
  }

  private class PyFilenameFilter implements FilenameFilter {

    private final String extension;
    private final boolean onlyIfCanonicalPresent;

    public PyFilenameFilter(String extension, boolean onlyIfCanonicalPresent) {
      this.extension = extension;
      this.onlyIfCanonicalPresent = onlyIfCanonicalPresent;
    }

    public boolean accept(File dir, String name) {
      int position = name.lastIndexOf('.');
      String canonicalFileName = name.substring(0, position) + ".canonical";
      File canonicalFile = new File(dir, canonicalFileName);
      if (onlyIfCanonicalPresent && !canonicalFile.exists()) {
        return false;
      } else {
        return name.endsWith(extension);
      }
    }
  }
}