/*
 * Copyright 2000-2011 JetBrains s.r.o.
 *
 * 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.codeInsight.actions;

import com.intellij.codeInsight.CodeInsightBundle;
import com.intellij.formatting.FormattingProgressTask;
import com.intellij.notification.Notification;
import com.intellij.notification.NotificationType;
import com.intellij.openapi.application.ApplicationBundle;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.module.Module;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.TextRange;
import com.intellij.psi.PsiDirectory;
import com.intellij.psi.PsiFile;
import com.intellij.psi.codeStyle.CodeStyleManager;
import com.intellij.util.IncorrectOperationException;
import com.intellij.util.containers.ContainerUtil;
import com.intellij.util.diff.FilesTooBigForDiffException;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.ArrayList;
import java.util.Collection;
import java.util.concurrent.Callable;
import java.util.concurrent.FutureTask;

public class ReformatCodeProcessor extends AbstractLayoutCodeProcessor {
  
  public static final String COMMAND_NAME = CodeInsightBundle.message("process.reformat.code");
  
  private static final Logger LOG = Logger.getInstance("#com.intellij.codeInsight.actions.ReformatCodeProcessor");

  private final Collection<TextRange> myRanges = new ArrayList<TextRange>();
  private static final String PROGRESS_TEXT = CodeInsightBundle.message("reformat.progress.common.text");

  public ReformatCodeProcessor(Project project, boolean processChangedTextOnly) {
    super(project, COMMAND_NAME, PROGRESS_TEXT, processChangedTextOnly);
  }

  public ReformatCodeProcessor(Project project, Module module, boolean processChangedTextOnly) {
    super(project, module, COMMAND_NAME, PROGRESS_TEXT, processChangedTextOnly);
  }

  public ReformatCodeProcessor(Project project, PsiDirectory directory, boolean includeSubdirs, boolean processChangedTextOnly) {
    super(project, directory, includeSubdirs, PROGRESS_TEXT, COMMAND_NAME, processChangedTextOnly);
  }

  public ReformatCodeProcessor(Project project, PsiFile file, @Nullable TextRange range, boolean processChangedTextOnly) {
    super(project, file, PROGRESS_TEXT, COMMAND_NAME, processChangedTextOnly);
    if (range != null) {
      myRanges.add(range);
    }
  }

  public ReformatCodeProcessor(Project project, PsiFile[] files, @Nullable Runnable postRunnable, boolean processChangedTextOnly) {
    this(project, files, COMMAND_NAME, postRunnable, processChangedTextOnly);
  }

  public ReformatCodeProcessor(Project project,
                               PsiFile[] files,
                               String commandName,
                               @Nullable Runnable postRunnable,
                               boolean processChangedTextOnly)
  {
    super(project, files, PROGRESS_TEXT, commandName, postRunnable, processChangedTextOnly);
  }

  @Override
  @NotNull
  protected FutureTask<Boolean> prepareTask(@NotNull final PsiFile file, final boolean processChangedTextOnly)
    throws IncorrectOperationException
  {
    return new FutureTask<Boolean>(new Callable<Boolean>() {
      @Override
      public Boolean call() throws Exception {
        FormattingProgressTask.FORMATTING_CANCELLED_FLAG.set(false);
        try {
          Collection<TextRange> ranges = getRangesToFormat(processChangedTextOnly, file);
          CodeStyleManager.getInstance(myProject).reformatText(file, ranges);
          return !FormattingProgressTask.FORMATTING_CANCELLED_FLAG.get();
        }
        catch (FilesTooBigForDiffException e) {
          LOG.info("Error while calculating changed ranges for: " + file.getVirtualFile(), e);
          if (!ApplicationManager.getApplication().isUnitTestMode()) {
            Notification notification = new Notification(ApplicationBundle.message("reformat.changed.text.file.too.big.notification.groupId"),
                                                         ApplicationBundle.message("reformat.changed.text.file.too.big.notification.title"),
                                                         ApplicationBundle.message("reformat.changed.text.file.too.big.notification.text", file.getName()),
                                                         NotificationType.INFORMATION);
            notification.notify(file.getProject());
          }
          return false;
        } 
        catch (IncorrectOperationException e) {
          LOG.error(e);
          return false;
        }
        finally {
          myRanges.clear();
        }
      }
    });
  }

  @NotNull
  private Collection<TextRange> getRangesToFormat(boolean processChangedTextOnly, PsiFile file) throws FilesTooBigForDiffException {
    if (processChangedTextOnly) {
      return FormatChangedTextUtil.getChangedTextRanges(myProject, file);
    }

    return !myRanges.isEmpty() ? myRanges : ContainerUtil.newArrayList(file.getTextRange());
  }
}