/*
 * Copyright 2000-2009 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 org.jetbrains.idea.svn.ignore;

import com.intellij.openapi.vfs.VirtualFile;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

public class FileGroupInfo implements FileIterationListener, IgnoreInfoGetter {
  private String commonExtension;
  private final Map<VirtualFile, Set<String>> folders;

  private int fileCount;
  private boolean sameExtensionCase;

  public FileGroupInfo() {
    fileCount = 0;
    sameExtensionCase = true;
    folders = new HashMap<VirtualFile, Set<String>>();
  }

  public void onFileEnabled(final VirtualFile file) {
    ++ fileCount;

    if (sameExtensionCase) {
      final String extension = file.getExtension();
      if (extension == null) {
        sameExtensionCase = false;
      } else if (commonExtension == null) {
        commonExtension = extension;
      } else {
        sameExtensionCase &= commonExtension.equals(extension);
      }
    }

    final VirtualFile parentVirtualFile = file.getParent();

    if (parentVirtualFile != null) {
      Set<String> namesList = folders.get(parentVirtualFile);
      if (namesList == null) {
        namesList = new HashSet<String>();
        folders.put(parentVirtualFile, namesList);
      }
      namesList.add(file.getName());
    }
  }

  public boolean oneFileSelected() {
    return fileCount == 1;
  }

  public boolean sameExtension() {
    return sameExtensionCase;
  }

  public String getExtensionMask() {
    return "*." + commonExtension;
  }

  public Map<VirtualFile, Set<String>> getInfo(final boolean useCommonExtension) {
    if (! useCommonExtension) {
      return folders;
    }
    final Map<VirtualFile, Set<String>> result = new HashMap<VirtualFile, Set<String>>(folders.size(), 1);
    for (final Map.Entry<VirtualFile, Set<String>> entry : folders.entrySet()) {
      final Set<String> set = new HashSet<String>();
      set.add(getExtensionMask());
      result.put(entry.getKey(), set);
    }
    return result;
  }

  public String getFileName() {
    return folders.values().iterator().next().iterator().next();
  }
}