/*
 * 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 editor;

import com.google.common.base.Joiner;
import com.google.dart.engine.ast.CompilationUnit;
import com.google.dart.tools.core.test.util.TestProject;
import com.google.dart.tools.ui.internal.text.editor.DartEditor;
import com.google.dart.ui.test.driver.Operation;
import com.google.dart.ui.test.driver.OperationExecutor;
import com.google.dart.ui.test.util.UiContext;

import junit.framework.TestCase;

import org.eclipse.core.resources.IFile;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.text.source.ISourceViewer;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.ui.IActionBars;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.ide.IDE;
import org.eclipse.ui.texteditor.AbstractTextEditor;

import static org.fest.assertions.Assertions.assertThat;

import java.lang.reflect.Method;
import java.util.concurrent.TimeUnit;

/**
 * Base for editor tab tests.
 */
public class AbstractDartEditorTabTest extends TestCase {
  protected final static String EOL = System.getProperty("line.separator", "\n");

  protected static TestProject testProject;

  /**
   * Opens given {@link CompilationUnit} in the {@link DartEditor}.
   */
  public static DartEditor openEditor(IFile file) throws Exception {
    return (DartEditor) IDE.openEditor(
        PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage(),
        file);
  }

  protected static String makeSource(String... lines) {
    return Joiner.on(EOL).join(lines);
  }

  private IFile testFile;

  protected DartEditor testEditor;
  protected ISourceViewer sourceViewer;
  protected StyledText textWidget;

  private final OperationExecutor operationExecutor = new OperationExecutor();

  /**
   * Asserts that the unit <code>test.dart</code> has the given content.
   */
  public void assertTestUnitContent(String... lines) throws Exception {
    assertEquals(makeSource(lines), getTestUnitContent());
  }

  /**
   * @return the content of the unit <code>test.dart</code>.
   */
  public String getTestUnitContent() throws Exception {
    return testProject.getFileString("test.dart");
  }

  /**
   * Opens {@link DartEditor} for unit <code>test.dart</code> with given content.
   */
  public void openTestEditor(String... lines) throws Exception {
    testFile = testProject.setFileContent("test.dart", makeSource(lines));
    testEditor = openEditor(testFile);
    // prepare ISourceViewer and StyledText
    {
      Method method = AbstractTextEditor.class.getDeclaredMethod("getSourceViewer");
      method.setAccessible(true);
      sourceViewer = (ISourceViewer) method.invoke(testEditor);
    }
    textWidget = sourceViewer.getTextWidget();
  }

  /**
   * Schedules the {@link Operation} execution.
   */
  protected final void addOperation(Operation operation) {
    operationExecutor.addOperation(operation);
  }

  /**
   * @return the end position of the given pattern in the editor source. Fails in pattern was not
   *         found.
   */
  protected int findEnd(String pattern) {
    return findOffset(pattern) + pattern.length();
  }

  /**
   * @return the offset of the given pattern in the editor source. Fails in pattern was not found.
   */
  protected int findOffset(String pattern) {
    int position = sourceViewer.getDocument().get().indexOf(pattern);
    assertThat(position).isNotEqualTo(-1);
    return position;
  }

  /**
   * @return the {@link IAction} with given definition ID, not <code>null</code>.
   */
  protected final IAction getEditorAction(String id) {
    IActionBars actionBars = testEditor.getEditorSite().getActionBars();
    IAction action = actionBars.getGlobalActionHandler(id);
    assertNotNull("Can not find action " + id, action);
    return action;
  }

  /**
   * Runs the scheduled {@link Operation}s, waits for the given time at most.
   */
  protected final void runUiOperations(long waitFor, TimeUnit unit) throws Exception {
    operationExecutor.runUiOperations(waitFor, unit);
  }

  /**
   * Places caret into the position of the given pattern.
   */
  protected final void selectOffset(String pattern) throws Exception {
    int position = findOffset(pattern);
    testEditor.selectAndReveal(position, 0);
  }

  /**
   * Selects and reveals the range associated with the given pattern.
   */
  protected final void selectRange(int start, int end) throws Exception {
    testEditor.selectAndReveal(start, end - start);
  }

  /**
   * Selects and reveals the range associated with the given pattern.
   */
  protected final void selectRange(String pattern) throws Exception {
    int position = findOffset(pattern);
    testEditor.selectAndReveal(position, pattern.length());
  }

  @Override
  protected void setUp() throws Exception {
    super.setUp();
    if (testProject == null) {
      testProject = new TestProject("sharedEditorTabProject");
    }
  }

  @Override
  protected void tearDown() throws Exception {
    PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().closeAllEditors(false);
    UiContext.runEventLoopOnce();
    super.tearDown();
  }
}