package net.sourceforge.phpeclipse.wiki.builder;

import java.io.InputStream;
import java.util.Iterator;

import net.sourceforge.phpeclipse.wiki.preferences.Util;

import org.eclipse.core.resources.ICommand;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IProjectDescription;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.Path;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.ui.IActionDelegate;
import org.eclipse.ui.IObjectActionDelegate;
import org.eclipse.ui.IWorkbenchPart;

public class AddBuilderAction implements IObjectActionDelegate {
  private IWorkbenchPart workbenchPart;

  /**
   *  
   */
  public AddBuilderAction() {
    super();
  }

  /**
   * @see IObjectActionDelegate#setActivePart(IAction, IWorkbenchPart)
   */
  public void setActivePart(IAction action, IWorkbenchPart targetPart) {
    workbenchPart = targetPart;
  }

  public void run(IAction action) {
    ISelectionProvider selectionProvider = null;
    selectionProvider = workbenchPart.getSite().getSelectionProvider();

    StructuredSelection selection = null;
    selection = (StructuredSelection) selectionProvider.getSelection();

    //Shell shell = null;
    Iterator iterator = null;
    iterator = selection.iterator();
    while (iterator.hasNext()) {
      //  obj => selected object in the view
      Object obj = iterator.next();

      // is it a resource
      if (obj instanceof IResource) {
        IResource resource = (IResource) obj;

        // check if it's a project resource
        switch (resource.getType()) {

        case IResource.PROJECT:
          addBuilder((IProject) resource);
        }
      }
    }
  }

  /**
   * @see IActionDelegate#selectionChanged(IAction, ISelection)
   */
  public void selectionChanged(IAction action, ISelection selection) {
  }

  public static void addBuilder(IProject project) {
    IProjectDescription desc;
    try {
      desc = project.getDescription();

      ICommand[] commands = desc.getBuildSpec();
      boolean found = false;

      for (int i = 0; i < commands.length; ++i) {
        if (commands[i].getBuilderName().equals(WikiBuilder.BUILDER_ID)) {
          found = true;
          break;
        }
      }
      if (!found) {
        //add builder to project
        ICommand command = desc.newCommand();
        command.setBuilderName(WikiBuilder.BUILDER_ID);
        ICommand[] newCommands = new ICommand[commands.length + 1];

        // Add it before other builders.
        System.arraycopy(commands, 0, newCommands, 1, commands.length);
        newCommands[0] = command;
        desc.setBuildSpec(newCommands);
        project.setDescription(desc, null);
        // add some default wiki project settings
        Util.setWikiBuilderPreferences(project);

        createVelocityFile(project, "main.vm");
        createVelocityFile(project, "export.vm");
        createVelocityFile(project, "main.css");
      }
    } catch (CoreException e) {
      e.printStackTrace();
    }
  }

  private static void createVelocityFile(IProject project, String filename) throws CoreException {
    InputStream is = AddBuilderAction.class.getResourceAsStream(filename);
    final IFile file = project.getFile(new Path("wpsrc/" + filename));
    if (!file.exists()) {
      file.create(is, true, null);
    }
  }
}