/*
 * Copyright 2011 The authors
 * 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.lang.ognl.psi;

import com.intellij.lang.ognl.OgnlFile;
import com.intellij.lang.ognl.OgnlLanguage;
import com.intellij.lang.ognl.parsing.OgnlElementType;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiFileFactory;
import com.intellij.testFramework.LightPlatformTestCase;
import com.intellij.util.IncorrectOperationException;
import org.intellij.lang.annotations.Language;

/**
 * Basic PSI-building "happy-path" test case.
 *
 * @author Yann Cébron
 */
public abstract class PsiTestCase extends LightPlatformTestCase {

  protected OgnlElement parseSingleExpression(@Language(value = OgnlLanguage.ID,
                                                        prefix = OgnlLanguage.EXPRESSION_PREFIX,
                                                        suffix = OgnlLanguage.EXPRESSION_SUFFIX) final String text) {
    final PsiElement[] expressions = parseExpressions(text);
    assertSize(1, expressions);

    return (OgnlElement) expressions[0];
  }

  protected PsiElement[] parseExpressions(@Language(value = OgnlLanguage.ID,
                                                    prefix = OgnlLanguage.EXPRESSION_PREFIX,
                                                    suffix = OgnlLanguage.EXPRESSION_SUFFIX) final String text) {
    final OgnlFile ognlFile = createFile(OgnlLanguage.EXPRESSION_PREFIX + text + OgnlLanguage.EXPRESSION_SUFFIX);
    assertNotNull(ognlFile);

    final PsiElement firstChild = ognlFile.getFirstChild();
    assertNotNull(firstChild);
    assertEquals(OgnlLanguage.INSTANCE, firstChild.getLanguage());

    return firstChild.getChildren();
  }

  protected void assertElementType(final OgnlElementType expectedType,
                                   final OgnlExpression expression) {
    assertEquals(expectedType, expression.getNode().getElementType());
  }

  private OgnlFile createFile(final String text) throws IncorrectOperationException {
    return (OgnlFile) PsiFileFactory.getInstance(getProject())
                                    .createFileFromText("test.ognl", OgnlLanguage.INSTANCE, text);
  }

}