// Copyright (c) 2010 The Chromium Authors. All rights reserved.

// Use of this source code is governed by a BSD-style license that can be

// found in the LICENSE file.

package org.chromium.debug.ui.actions;

import java.io.ByteArrayInputStream;

import java.io.InputStream;

import java.lang.reflect.InvocationTargetException;

import org.chromium.debug.core.model.VmResource;

import org.eclipse.compare.CompareConfiguration;

import org.eclipse.compare.CompareEditorInput;

import org.eclipse.compare.CompareUI;

import org.eclipse.compare.IModificationDate;

import org.eclipse.compare.IStreamContentAccessor;

import org.eclipse.compare.ITypedElement;

import org.eclipse.compare.structuremergeviewer.DiffNode;

import org.eclipse.compare.structuremergeviewer.Differencer;

import org.eclipse.core.resources.IFile;

import org.eclipse.core.runtime.CoreException;

import org.eclipse.core.runtime.IProgressMonitor;

import org.eclipse.swt.graphics.Image;

/**

 * A very preliminary implementation of action that should let user compare his script with

 * its current state on remote VM.

 */

public class CompareChangesAction extends V8ScriptAction {

  @Override

  protected void execute(FilePair filePair) {

    LiveEditCompareInput input = new LiveEditCompareInput(filePair.getFile(), filePair.getVmResource());

    CompareUI.openCompareEditor(input);

  }

  private static class LiveEditCompareInput extends CompareEditorInput {

    private final IFile file;

    private final VmResource script;

    LiveEditCompareInput(IFile file, VmResource vmResource) {

      super(createCompareConfiguration());

      this.file = file;

      this.script = vmResource;

    }

    private static CompareConfiguration createCompareConfiguration() {

      return new CompareConfiguration();

    }

    @Override

    protected Object prepareInput(IProgressMonitor monitor) throws InvocationTargetException,

        InterruptedException {

      abstract class CompareItem implements ITypedElement, IStreamContentAccessor,

          IModificationDate {

        public Image getImage() {

          return null;

        }

        public String getType() {

          return TEXT_TYPE;

        }

        public long getModificationDate() {

          return 0;

        }

      }

      CompareItem left = new CompareItem() {

        public String getName() {

          return "Local file " + file.getName(); //$NON-NLS-1$

        }

        public InputStream getContents() throws CoreException {

          return file.getContents();

        }

      };

      CompareItem right = new CompareItem() {

        public String getName() {

          return "File in VM " + script.getFileName(); //$NON-NLS-1$

        }

        public InputStream getContents() throws CoreException {

          return new ByteArrayInputStream(script.getScript().getSource().getBytes());

        }

      };

      DiffNode diffNode = new DiffNode(null, Differencer.PSEUDO_CONFLICT, null, left, right);

      return diffNode;

    }

  }

}