/**
 * Copyright (C) 2016 Red Hat, Inc. and/or its affiliates.
 *
 * 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.jboss.errai.ioc.util;

import org.jboss.errai.codegen.meta.MetaClass;

/**
 * A collection of methods for generating identifier-safe names for resources dervied from Java classes.
 *
 * @author Max Barkley <mbarkley@redhat.com>
 */
public class GeneratedNamesUtil {

  public static String qualifiedClassNameToIdentifier(final MetaClass type) {
    return qualifiedClassNameToIdentifier(type.getFullyQualifiedName());
  }

  public static String qualifiedClassNameToIdentifier(final Class<?> type) {
    return qualifiedClassNameToIdentifier(type.getName());
  }

  public static String qualifiedClassNameToIdentifier(final String fullyQualifiedName) {
    return fullyQualifiedName.replace('.', '_').replace('$', '_');
  }

  public static String qualifiedClassNameToShortenedIdentifier(final String fullyQualifiedName) {
    return shortenGeneratedIdentifier(qualifiedClassNameToIdentifier(fullyQualifiedName));
  }

  public static String qualifiedClassNameToShortenedIdentifier(final MetaClass type) {
    return shortenGeneratedIdentifier(qualifiedClassNameToIdentifier(type));
  }

  public static String qualifiedClassNameToShortenedIdentifier(final Class<?> type) {
    return shortenGeneratedIdentifier(qualifiedClassNameToIdentifier(type));
  }

  public static String shortenGeneratedIdentifier(final String name) {
    return shortenGeneratedIdentifier(name, "_");
  }

  public static String shortenGeneratedIdentifier(final String name, final String separator) {
    final String[] parts = name.split(separator);
    final StringBuilder builder = new StringBuilder();
    boolean haveSeenUpperCase = false;
    for (final String part : parts) {
      if (haveSeenUpperCase || Character.isUpperCase(part.charAt(0))) {
        builder.append(part);
        haveSeenUpperCase = true;
      }
      else {
        builder.append(part.charAt(0));
      }
      builder.append(separator);
    }
    builder.delete(builder.length() - 1, builder.length());

    return builder.toString();
  }

}