/*
 * Copyright 2000-2013 JetBrains s.r.o.
 * Copyright 2014-2014 AS3Boyan
 * Copyright 2014-2014 Elias Ku
 *
 * 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.intellij.plugins.haxe.ide.folding;

import com.intellij.lang.ASTNode;
import com.intellij.lang.folding.FoldingBuilder;
import com.intellij.lang.folding.FoldingDescriptor;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.util.TextRange;
import com.intellij.plugins.haxe.lang.lexer.HaxeTokenTypes;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.ArrayList;
import java.util.List;

public class HaxeFoldingBuilder implements FoldingBuilder {
  @NotNull
  @Override
  public FoldingDescriptor[] buildFoldRegions(@NotNull ASTNode node, @NotNull Document document) {
    List<FoldingDescriptor> list = new ArrayList<FoldingDescriptor>();
    buildFolding(node, list);
    FoldingDescriptor[] descriptors = new FoldingDescriptor[list.size()];
    return list.toArray(descriptors);
  }

  private static void buildFolding(ASTNode node, List<FoldingDescriptor> list) {
    if (node.getElementType() == HaxeTokenTypes.BLOCK_STATEMENT) {
      final TextRange range = node.getTextRange();
      list.add(new FoldingDescriptor(node, range));
    }
    for (ASTNode child : node.getChildren(null)) {
      buildFolding(child, list);
    }
  }

  @Nullable
  @Override
  public String getPlaceholderText(@NotNull ASTNode node) {
    return "{...}";
  }

  @Override
  public boolean isCollapsedByDefault(@NotNull ASTNode node) {
    return false;
  }
}