/*
 * Copyright 2000-2012 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.diff.impl.external;

import com.intellij.openapi.diff.DiffContent;
import com.intellij.openapi.diff.DiffRequest;
import com.intellij.openapi.diff.impl.mergeTool.MergeRequestImpl;
import com.intellij.openapi.util.text.StringUtil;

import java.util.ArrayList;
import java.util.List;

/**
 * @author Konstantin Bulenkov
 */
public class ExtMergeFiles extends BaseExternalTool {
  public static final ExtMergeFiles INSTANCE = new ExtMergeFiles();

  protected ExtMergeFiles() {
    super(DiffManagerImpl.ENABLE_MERGE, DiffManagerImpl.MERGE_TOOL);
  }

  @Override
  public boolean isAvailable(DiffRequest request) {
    DiffContent[] contents = request.getContents();
    if (contents.length != 3) return false;
    if (externalize(request, 0) == null) return false;
    if (externalize(request, 1) == null) return false;
    if (externalize(request, 2) == null) return false;

    return true;
  }

  @Override
  protected List<String> getParameters(DiffRequest request) throws Exception {
    final List<String> params = new ArrayList<String>();
    String result = ((MergeRequestImpl)request).getResultContent().getFile().getPath();
    String left = externalize(request, 0).getContentFile().getPath();
    String base = new ExternalToolContentExternalizer(request, 1).getContentFile().getPath();
    String right = externalize(request, 2).getContentFile().getPath();
    for (String param : StringUtil.split(DiffManagerImpl.MERGE_TOOL_PARAMETERS.get(getProperties()), " ")) {
      if ("%1".equals(param)) params.add(left);
      else if ("%2".equals(param)) params.add(base);
      else if ("%3".equals(param)) params.add(right);
      else if ("%4".equals(param)) params.add(result);
      else params.add(param);
    }
    return params;
  }
}