/**
 * Copyright (c) 2009-2010 Thales Corporate Services S.A.S.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 * Thales Corporate Services S.A.S - initial API and implementation
 */
package org.eclipse.egf.core.pde.helper;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.egf.common.helper.BundleHelper;
import org.eclipse.egf.common.helper.ProjectHelper;
import org.eclipse.egf.core.pde.EGFPDEPlugin;
import org.eclipse.egf.core.pde.internal.FcoreGeneratorHelper;
import org.eclipse.egf.core.pde.internal.ui.PDEModelUtility;
import org.eclipse.osgi.util.NLS;
import org.eclipse.pde.core.plugin.IPluginBase;
import org.eclipse.pde.core.plugin.IPluginModelBase;
import org.eclipse.pde.internal.core.TargetPlatformHelper;
import org.eclipse.pde.internal.core.build.WorkspaceBuildModel;
import org.eclipse.pde.internal.core.plugin.WorkspaceFragmentModel;
import org.eclipse.pde.internal.core.plugin.WorkspacePluginModel;
import org.eclipse.pde.internal.core.plugin.WorkspacePluginModelBase;

/**
 * Implement a plug-in changes command runner.
 * 
 * @author Guillaume Brocard
 */
public class PluginHelper {

  private PluginHelper() {
    // Prevent Instantiation
  }

  /**
   * 3.0 level compliance of plugin.xml
   */
  private static final String PLUGIN_VERSION_3_0 = "3.0"; //$NON-NLS-1$

  /**
   * 3.2 level compliance of plugin.xml
   */
  private static final String PLUGIN_VERSION_3_2 = "3.2"; //$NON-NLS-1$

  /**
   * Update the build.properties file to add the plugin.xml file in
   * bin.includes.
   * 
   * @param model
   */
  public static void updateBuildFile(WorkspacePluginModelBase model) throws CoreException {
    // Add the newly created plug-in file in the build.properties.
    IFile file = model.getFile();
    WorkspaceBuildModel buildModel = (WorkspaceBuildModel) model.getBuildModel();
    IProject project = file.getProject();
    if (buildModel == null) {
      buildModel = FcoreGeneratorHelper.getBuildModel(project);
      model.setBuildModel(buildModel);
    }
    FcoreGeneratorHelper.addEntryInBinaryBuild(buildModel, PDEModelUtility.F_PLUGIN);
    // Save the build.properties.
    buildModel.save();
  }

  /**
   * Create plug-in model object
   * 
   * @param model
   * @param bundleRelativeFileName
   *          the searched bundle file name.<br>
   * @param bundleId
   *          The bundle id.
   * @return a {@link WorkspacePluginModelBase} instance or null if
   *         instantiation fails.
   */
  public static WorkspacePluginModelBase createWorkspacePluginModelBase(IPluginModelBase model) throws CoreException {
    IFile file = getFile(model, PDEModelUtility.F_PLUGIN);
    if (file == null) {
      return null;
    }
    WorkspacePluginModelBase pluginModel = null;
    // Get the real model file.
    pluginModel = (WorkspacePluginModelBase) getModel(file);
    if (pluginModel == null) {
      throw new CoreException(EGFPDEPlugin.getDefault().newStatus(IStatus.ERROR, NLS.bind("PluginChangesCommandRunner.createWorkspacePluginModelBase(..) _ bundleId ''{0}''.", BundleHelper.getBundleId(model)), null)); //$NON-NLS-1$
    }
    // Set default attributes.
    IPluginBase base = pluginModel.getPluginBase();
    base.setSchemaVersion(TargetPlatformHelper.getTargetVersion() < 3.2 ? PLUGIN_VERSION_3_0 : PLUGIN_VERSION_3_2);
    return pluginModel;
  }

  /**
   * Test whether or not given bundle model object exists.
   * 
   * @param model
   * @param bundleRelativeFileName
   *          the searched bundle file name.<br>
   * @return
   */
  public static boolean bundleFileExists(IPluginModelBase model, String file) {
    IFile result = getFile(model, file);
    if (file != null) {
      return result.exists();
    }
    return false;
  }

  /**
   * Get the Plug-in object for given {@link IFile} related to a plugin.xml
   * file.
   * 
   * @param file
   * @return
   */
  public static IPluginModelBase getModel(IFile file) {
    if (file == null) {
      return null;
    }
    if (PDEModelUtility.F_PLUGIN.equals(file.getName())) {
      return new WorkspacePluginModel(file, false);
    } else if (PDEModelUtility.F_FRAGMENT.equals(file.getName())) {
      return new WorkspaceFragmentModel(file, false);
    }
    return null;
  }

  /**
   * Get the plug-in file for given plug-in model object (without checking
   * existence) for specified bundle fileName.
   * 
   * @param model
   * @param file
   *          the searched bundle file name.<br>
   * @return.
   */
  public static IFile getFile(IPluginModelBase model, String file) {
    // Precondition.
    if (model == null) {
      return null;
    }
    IProject project = ProjectHelper.getProject(model);
    if (project == null) {
      project = ProjectHelper.getProject(BundleHelper.getBundleId(model));
    }
    if (project == null) {
      return null;
    }
    return project.getFile(file);
  }
}