/*
 * Copyright (c) 2012, the Dart project authors.
 * 
 * Licensed under the Eclipse Public License v1.0 (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.eclipse.org/legal/epl-v10.html
 * 
 * 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.google.dart.tools.ui.web.css;

import com.google.dart.tools.ui.web.utils.WebEditorAutoIndentStrategy;

import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.DocumentCommand;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;

/**
 * An indent strategy for css.
 */
public class CssAutoIndentStrategy extends WebEditorAutoIndentStrategy {

  public CssAutoIndentStrategy() {

  }

  @Override
  protected void doAutoIndentAfterNewLine(IDocument document, DocumentCommand command) {
    if (command.offset == -1 || document.getLength() == 0) {
      return;
    }

    try {
      // find start of line
      int location = (command.offset == document.getLength() ? command.offset - 1 : command.offset);
      IRegion lineInfo = document.getLineInformationOfOffset(location);
      int start = lineInfo.getOffset();

      // Auto-indent after a '{'+eol is typed.
      boolean endsInBrace = (document.getChar(command.offset - 1) == '{');

      // find white spaces
      int end = findEndOfWhiteSpace(document, start, command.offset);

      StringBuffer buf = new StringBuffer(command.text);

      String wsStart = "";

      if (end > start) {
        // append to input
        wsStart = document.get(start, end - start);

        buf.append(wsStart);
      }

      if (endsInBrace) {
        buf.append("  ");

        // Insert \n, indent, and '}', then back up the caret position.
        //String eol = getEol(document, command.offset);

        String closingBracket = /*eol +*/wsStart /* + "}"*/;

        buf.append(closingBracket);

        command.shiftsCaret = false;
        command.caretOffset = command.offset + buf.length() - closingBracket.length();
      }

      command.text = buf.toString();
    } catch (BadLocationException excp) {
      // stop work
    }
  }

//  private String getEol(IDocument document, int offset) throws BadLocationException {
//    String eol = document.getLineDelimiter(document.getLineOfOffset(offset));
//
//    if (eol == null) {
//      eol = document.getLineDelimiter(0);
//    }
//
//    if (eol == null) {
//      eol = "\n";
//    }
//
//    return eol;
//  }

}