/*
 * Copyright 2000-2010 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.changes.patch;

import com.intellij.openapi.actionSystem.AnAction;
import com.intellij.openapi.diff.DiffRequestFactory;
import com.intellij.openapi.diff.MergeRequest;
import com.intellij.openapi.diff.SimpleDiffRequest;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.Getter;
import com.intellij.openapi.util.io.FileUtil;
import com.intellij.openapi.vcs.FilePathImpl;
import com.intellij.openapi.vcs.VcsBundle;
import com.intellij.openapi.vcs.changes.actions.*;
import com.intellij.openapi.vfs.VirtualFile;

import java.util.Collections;
import java.util.List;

public class MergedDiffRequestPresentable implements DiffRequestPresentable {
  private final Project myProject;
  private final VirtualFile myFile;
  private final String myAfterTitle;
  private final Getter<ApplyPatchForBaseRevisionTexts> myTexts;

  public MergedDiffRequestPresentable(final Project project, final Getter<ApplyPatchForBaseRevisionTexts> texts, final VirtualFile file, final String afterTitle) {
    myTexts = texts;
    myProject = project;
    myFile = file;
    myAfterTitle = afterTitle;
  }

  public MyResult step(DiffChainContext context) {
    FilePathImpl filePath = new FilePathImpl(myFile);
    if (filePath.getFileType().isBinary()) {
      final boolean nowItIsText = ChangeDiffRequestPresentable.checkAssociate(myProject, filePath, context);
      if (! nowItIsText) {
        final SimpleDiffRequest request = new SimpleDiffRequest(myProject, null);
        return new MyResult(request, DiffPresentationReturnValue.removeFromList);
      }
    }
    final ApplyPatchForBaseRevisionTexts revisionTexts = myTexts.get();
    if (revisionTexts.getBase() == null) {
      final SimpleDiffRequest badDiffRequest = ApplyPatchAction.createBadDiffRequest(myProject, myFile, revisionTexts, true);
      return new MyResult(badDiffRequest, DiffPresentationReturnValue.useRequest);
    }
    final MergeRequest request = DiffRequestFactory.getInstance()
      .create3WayDiffRequest(revisionTexts.getLocal().toString(),
                             revisionTexts.getPatched(),
                             revisionTexts.getBase().toString(),
                             filePath.getFileType(), myProject, null, null);
    request.setWindowTitle(VcsBundle.message("patch.apply.conflict.title", FileUtil.toSystemDependentName(myFile.getPresentableUrl())));
    request.setVersionTitles(new String[] {"Current Version", "Base Version", FileUtil.toSystemDependentName(myAfterTitle)});
    return new MyResult(request, DiffPresentationReturnValue.useRequest);
  }

  @Override
  public String getPathPresentation() {
    return myFile.getPath();
  }

  public void haveStuff() {
  }

  public List<? extends AnAction> createActions(DiffExtendUIFactory uiFactory) {
    return Collections.emptyList();
  }
}