/*
 * The Apache Software License, Version 1.1
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 * reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
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 *    distribution.
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 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
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 *    if and wherever such third-party acknowlegements normally appear.
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package org.apache.tools.ant.gui;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.ProjectHelper;
import org.apache.tools.ant.BuildEvent;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.BuildListener;
import org.apache.tools.ant.gui.event.*;
import java.io.File;
import java.io.IOException;
import javax.swing.tree.TreeModel;
import javax.swing.text.Document;
import java.util.Enumeration;

/**
 * This class provides the gateway interface to the data model for
 * the application. The translation between the Ant datamodel, 
 * (or other external datamodel) occurs. This class also provides various
 * views into the data model, such as TreeModel, Documenet, etc.
 * 
 * @version $Revision$ 
 * @author Simeon Fitch 
 */
public class ProjectProxy {

    /** Application context */
    private AppContext _context = null;
    /** The file where the project was last saved. */
    private File _file = null;
    /** The real Ant Project instance. */
    private Project _project = null;
    /** Private the current thread executing a build. */
    private Thread _buildThread = null;

	/** 
	 * File loading ctor.
	 * 
	 * @param file File containing build file to load.
	 */
    public ProjectProxy(AppContext context, File file) throws IOException {
        _file = file;
        _context = context;
        loadProject();
    }

	/** 
	 * Load the project from the build file.
	 * 
	 */
    private void loadProject() throws IOException {
        _project = new Project();
        synchronized(_project) {
            _project.init();

            // XXX there is a bunch of stuff in the class
            // org.apache.tools.ant.Main that needs to be
            // abstracted out so that it doesn't have to be
            // replicated here.
        
            // XXX need to provide a way to pass in externally
            // defined properties.  Perhaps define an external
            // Antidote properties file.
            _project.setUserProperty("ant.file" , _file.getAbsolutePath());
            ProjectHelper.configureProject(_project, _file);
        }
    }

	/** 
	 * Build the project with the current target (or the default target
     * if none is selected.  Build occurs on a separate thread, so method
     * returns immediately.
	 * 
	 */
    public void build() throws BuildException {
        if(_project == null) return;

        _buildThread = new Thread(new BuildRunner());
        _buildThread.start();
    }

	/** 
	 * Get the file where the project is saved to. If the project
     * is a new one that has never been saved the this will return null.
	 * 
	 * @return Project file, or null if not save yet.
	 */
    public File getFile() {
        return _file;
    }

	/** 
	 * Get the TreeModel perspective on the data.
	 * 
	 * @return TreeModel view on project.
	 */
    public TreeModel getTreeModel() {
        if(_project != null) {
            return new ProjectTreeModel(_project);
        }
        return null;
    }

	/** 
	 * Get the Document perspective on the data.
	 * 
	 * @return Document view on project.
	 */
    public Document getDocument() {
        if(_project != null) {
            // This is what the call should look like
            //return new ProjectDocument(_project);

            return new ProjectDocument(_file);
        }
        return null;
    }

	/** 
	 * Convenience method for causeing the project to fire a build event.
     * Implemented because the corresponding method in the Project class
     * is not publically accessible.
	 * 
	 * @param event Event to fire.
	 */
    private void fireBuildEvent(BuildEvent event, BuildEventType type) {
        synchronized(_project) {
            Enumeration enum = _project.getBuildListeners().elements();
            while(enum.hasMoreElements()) {
                BuildListener l = (BuildListener) enum.nextElement();
                type.fireEvent(event, l);
            }
        }
    }

    /** Class for executing the build in a separate thread. */
    private class BuildRunner implements Runnable {
        public void run() {
            synchronized(_project) {
                // Add the build listener for
                // dispatching BuildEvent objects to the
                // EventBus.
                BuildEventForwarder handler = 
                    new BuildEventForwarder(_context);
                _project.addBuildListener(handler);
                try {
                    fireBuildEvent(new BuildEvent(
                        _project), BuildEventType.BUILD_STARTED);
                    // XXX add code to indicate target execution
                    // on the targets that are selected.
                    _project.executeTarget(
                        _project.getDefaultTarget());
                }
                catch(BuildException ex) {
                    BuildEvent errorEvent = new BuildEvent(_project);
                    errorEvent.setException(ex);
                    errorEvent.setMessage(ex.getMessage(), Project.MSG_ERR);
                    fireBuildEvent(errorEvent, BuildEventType.MESSAGE_LOGGED);
                }
                finally {
                    fireBuildEvent(new BuildEvent(
                        _project), BuildEventType.BUILD_FINISHED);
                    _project.removeBuildListener(handler);
                    _buildThread = null;
                }
            }
        }
    }

}