/*
 * 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.openapi.vcs;

import com.intellij.codeInsight.completion.CompletionContributor;
import com.intellij.codeInsight.completion.CompletionParameters;
import com.intellij.codeInsight.completion.CompletionResultSet;
import com.intellij.codeInsight.completion.impl.CamelHumpMatcher;
import com.intellij.codeInsight.lookup.LookupElementBuilder;
import com.intellij.ide.presentation.VirtualFilePresentation;
import com.intellij.openapi.actionSystem.DataContext;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.vcs.changes.Change;
import com.intellij.openapi.vcs.changes.ChangeList;
import com.intellij.openapi.vcs.ui.CommitMessage;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.psi.PsiDocumentManager;
import com.intellij.psi.PsiFile;
import com.intellij.ui.TextFieldWithAutoCompletionListProvider;import consulo.annotations.RequiredReadAction;

/**
 * @author Dmitry Avdeev
 */
public class CommitCompletionContributor extends CompletionContributor {

  @RequiredReadAction
  @Override
  public void fillCompletionVariants(CompletionParameters parameters, CompletionResultSet result) {
    PsiFile file = parameters.getOriginalFile();
    Document document = PsiDocumentManager.getInstance(file.getProject()).getDocument(file);
    if (document != null) {
      DataContext dataContext = document.getUserData(CommitMessage.DATA_CONTEXT_KEY);
      if (dataContext != null) {
        result.stopHere();
        if (parameters.getInvocationCount() > 0) {
          ChangeList[] lists = VcsDataKeys.CHANGE_LISTS.getData(dataContext);
          if (lists != null) {
            String prefix = TextFieldWithAutoCompletionListProvider.getCompletionPrefix(parameters);
            CompletionResultSet insensitive = result.caseInsensitive().withPrefixMatcher(new CamelHumpMatcher(prefix));
            for (ChangeList list : lists) {
              for (Change change : list.getChanges()) {
                VirtualFile virtualFile = change.getVirtualFile();
                if (virtualFile != null) {
                  LookupElementBuilder element = LookupElementBuilder.create(virtualFile.getName()).
                    withIcon(VirtualFilePresentation.getIcon(virtualFile));
                  insensitive.addElement(element);
                }
              }
            }
          }
        }
      }
    }
  }
}