/*
 * 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.util;

import com.intellij.plugins.haxe.lang.psi.HaxeImportStatementRegular;
import com.intellij.plugins.haxe.lang.psi.HaxePackageStatement;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiFile;

/**
 * @author: Fedor.Korotkov
 */
public class HaxeAddImportHelper {
  public static void addImport(String path, PsiFile file) {
    int positionIndex = 0;
    final PsiElement[] children = file.getChildren();

    while ((children[positionIndex] instanceof HaxePackageStatement ||
            UsefulPsiTreeUtil.isWhitespaceOrComment(children[positionIndex]) &&
            positionIndex < children.length)) {
      ++positionIndex;
    }

    assert positionIndex < children.length;
    insertImportBefore(path, file, children[positionIndex]);
  }

  private static void insertImportBefore(String path, PsiFile file, PsiElement child) {
    final HaxeImportStatementRegular importStatement =
      HaxeElementGenerator.createImportStatementFromPath(file.getProject(), path);
    if (importStatement == null) {
      return;
    }

    file.addBefore(importStatement, child);
  }
}