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package de.digitalcollections.commons.yaml;

import de.digitalcollections.commons.yaml.joda.JodaTimeConstructor;
import de.digitalcollections.commons.yaml.joda.JodaTimeRepresenter;
import org.yaml.snakeyaml.DumperOptions;
import org.yaml.snakeyaml.DumperOptions.FlowStyle;
import org.yaml.snakeyaml.Yaml;

public class StringRepresentations {

  private static final Yaml YAML;

  static {
    DumperOptions options = new DumperOptions();
    options.setDefaultFlowStyle(FlowStyle.FLOW);
    options.setPrettyFlow(true);
    options.setSplitLines(false);
    options.setAllowReadOnlyProperties(true);
    options.setLineBreak(DumperOptions.LineBreak.UNIX);
    boolean yodaTimeIsPresent;
    try {
      Class.forName("org.joda.time.DateTime");
      yodaTimeIsPresent = true;
    } catch (ClassNotFoundException e) {
      yodaTimeIsPresent = false;
    }
    if (yodaTimeIsPresent) {
      YAML = new Yaml(new JodaTimeConstructor(), new JodaTimeRepresenter(), options);
    } else {
      YAML = new Yaml(options);
    }
  }

  /**
   * Convert the given object to a string representation using YAML.
   *
   * @param object The object to make a string of.
   * @return A YAML string representing the object in its current state.
   */
  public static String stringRepresentationOf(Object object) {
    try {
      String string = YAML.dump(object);
      return string.substring(0, string.length() - 1);
    } catch (Exception e) {
      return object.toString();
    }
  }

  public static Object fromStringRepresetation(String string) {
    return YAML.load(string);
  }

  public static  T fromStringRepresetation(Class type, String string) {
    return YAML.loadAs(string, type);
  }

}