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/**
 * Copyright (C) 2006-2014 phloc systems
 * http://www.phloc.com
 * office[at]phloc[dot]com
 *
 * 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 com.phloc.css;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;

import com.phloc.commons.annotations.PresentForCodeCoverage;
import com.phloc.commons.string.StringHelper;

/**
 * Utility methods to deal with CSS filenames.
 * 
 * @author Philip Helger
 */
@Immutable
public final class CSSFilenameHelper
{
  @SuppressWarnings ("unused")
  @PresentForCodeCoverage
  private static final CSSFilenameHelper s_aInstance = new CSSFilenameHelper ();

  private CSSFilenameHelper ()
  {}

  /**
   * Check if the passed filename is a CSS filename (independent if regular or
   * minified)
   * 
   * @param sFilename
   *        The filename to check.
   * @return true if the passed filename is a CSS filename.
   */
  public static boolean isCSSFilename (@Nullable final String sFilename)
  {
    return StringHelper.endsWith (sFilename, CCSS.FILE_EXTENSION_CSS);
  }

  /**
   * Check if the passed filename is a minified CSS filename
   * 
   * @param sFilename
   *        The filename to check.
   * @return true if the passed filename is a minified CSS
   *         filename.
   */
  public static boolean isMinifiedCSSFilename (@Nullable final String sFilename)
  {
    return StringHelper.endsWith (sFilename, CCSS.FILE_EXTENSION_MIN_CSS);
  }

  /**
   * Check if the passed filename is a regular (not minified) CSS filename
   * 
   * @param sFilename
   *        The filename to check.
   * @return true if the passed filename is a regular CSS filename.
   */
  public static boolean isRegularCSSFilename (@Nullable final String sFilename)
  {
    return isCSSFilename (sFilename) && !isMinifiedCSSFilename (sFilename);
  }

  /**
   * Get the minified CSS filename from the passed filename. If the passed
   * filename is already minified, it is returned as is.
   * 
   * @param sCSSFilename
   *        The filename to get minified. May not be null.
   * @return The minified filename
   */
  @Nonnull
  public static String getMinifiedCSSFilename (@Nonnull final String sCSSFilename)
  {
    if (!isCSSFilename (sCSSFilename))
      throw new IllegalArgumentException ("Passed file name '" + sCSSFilename + "' is not a CSS file name!");
    if (isMinifiedCSSFilename (sCSSFilename))
      return sCSSFilename;
    return StringHelper.trimEnd (sCSSFilename, CCSS.FILE_EXTENSION_CSS) + CCSS.FILE_EXTENSION_MIN_CSS;
  }
}