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/**
 * Copyright (C) 2014-2016 Philip Helger (www.helger.com)
 * philip[at]helger[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.helger.css;

import javax.annotation.Nonnegative;
import javax.annotation.Nonnull;

import com.helger.commons.annotation.Nonempty;
import com.helger.commons.system.ENewLineMode;

/**
 * Settings for customizing the serialization of CSS properties etc.
 *
 * @author Philip Helger
 */
public interface ICSSWriterSettings
{
  /**
   * @return The CSS version to be used. May not be null.
   */
  @Nonnull
  ECSSVersion getVersion ();

  /**
   * @return true if all unnecessary whitespaces should be ignored
   *         when writing.
   */
  boolean isOptimizedOutput ();

  /**
   * @return true if all unnecessary elements (like empty style
   *         declarations) should be removed. This will than potentially lead to
   *         CSS that is not equal to the original CSS!
   */
  boolean isRemoveUnnecessaryCode ();

  /**
   * @return The new line mode to be used for emitting the file. By default the
   *         Unix new line mode ("\n") is used.
   */
  @Nonnull
  ENewLineMode getNewLineMode ();

  /**
   * @return The string underlying the new line mode
   * @see #getNewLineMode()
   */
  @Nonnull
  @Nonempty
  String getNewLineString ();

  /**
   * Get the indentation for an arbitrary number of levels. This can be used to
   * customize the indentation strategy like using tabs or spaces, how many
   * spaces etc.
   *
   * @param nCount
   *        The number of indentations desired. Always ≥ 0.
   * @return The string to be used for indentation. May not be null
   *         but may be empty.
   */
  @Nonnull
  String getIndent (@Nonnegative int nCount);

  /**
   * @return true if all URL values should be quoted,
   *         false if URL quoting should only be applied if
   *         absolutely necessary.
   */
  boolean isQuoteURLs ();

  /**
   * @return true if @namespace rules should be written,
   *         false if not
   */
  boolean isWriteNamespaceRules ();

  /**
   * @return true if @font-face rules should be written,
   *         false if not
   */
  boolean isWriteFontFaceRules ();

  /**
   * @return true if @keyframes rules should be written,
   *         false if not
   */
  boolean isWriteKeyframesRules ();

  /**
   * @return true if @media rules should be written,
   *         false if not
   */
  boolean isWriteMediaRules ();

  /**
   * @return true if @page rules should be written,
   *         false if not
   */
  boolean isWritePageRules ();

  /**
   * @return true if @viewport rules should be written,
   *         false if not
   */
  boolean isWriteViewportRules ();

  /**
   * @return true if @supports rules should be written,
   *         false if not
   */
  boolean isWriteSupportsRules ();

  /**
   * @return true if unknown @ rules should be written,
   *         false if not
   */
  boolean isWriteUnknownRules ();

  /**
   * Check if the passed object matches the version requirements defined be this
   * settings.
   *
   * @param aCSSObject
   *        The object to be checked.
   * @throws IllegalStateException
   *         In case the version does not match
   * @see #getVersion()
   */
  void checkVersionRequirements (@Nonnull ICSSVersionAware aCSSObject) throws IllegalStateException;
}