/*******************************************************************************
 * Copyright (c) 2000, 2006 IBM Corporation and others.
 * 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.releng;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Task;
import java.util.StringTokenizer;
import java.util.Vector;
import java.util.Enumeration;
import java.io.*;

/**
 * Uses an ElementParser to read a list of feature.xml files and to determine
 * if all plugins defined in the features are present.
 */

public class FetchValidator extends Task {

	//directory containing of build source, parent of features and plugins
	private String install = "";

	//Comma separated list of features to parse
	private String list;

	//Elements to check for post fetch (use name of project in dev.eclipse.org)
	private Vector features;
	private Vector plugins;

	//keeps track of missing elements
	private Vector missingPlugins;
	private Vector missingFeatures;
	
	
	//parser
	ElementParser parser;

	//test
	public static void main(String args[]) {
		FetchValidator validator = new FetchValidator();
		validator.install = "l:/vabase/team/sonia";
		validator.list =
			"org.eclipse.platform-feature,org.eclipse.platform.win32-feature,org.eclipse.platform.linux.motif-feature";
		validator.getListOfFeatures(validator.list);

		validator.execute();
	}

	// entry point
	public void execute() throws BuildException {
		getListOfFeatures(list);

		if (!allPresent()) {
			String missingFeaturesDesc="";
			String missingPluginsDesc="";

			if (missingFeatures.size() > 0) {
				for (int i = 0; i < missingFeatures.size(); i++) {
					missingFeaturesDesc+="\n\r"+missingFeatures.get(i).toString();
				}
			}

			if (missingPlugins.size() > 0) {
				for (int i = 0; i < missingPlugins.size(); i++) {
					missingPluginsDesc+="\n\t"+missingPlugins.get(i).toString();
				}
			}
			throw new BuildException("The following projects did not get fetched: \n"+missingFeaturesDesc+missingPluginsDesc+"\n"
			+"\n\nPossible causes of missing source files include an incorrect Tag entry in a .map file or problems with CVS repositories.");					
		}

		System.out.println("Fetch Complete.");
	}

	public FetchValidator() {
		parser = new ElementParser();
		missingPlugins = new Vector();
		missingFeatures = new Vector();
	}

	private void getListOfFeatures(String list) {

		StringTokenizer tokenizer = new StringTokenizer(list, ",");

		while (tokenizer.hasMoreTokens()) {
			parser.parse(
				install,
				"feature",
				(String) tokenizer.nextToken().trim());
		}

		features = parser.getFeatures();
		plugins = parser.getPlugins();
	}

	private boolean allPresent() {
		// verify presence of all source projects for the build.  
		// collect a list of missing plugins (or fragments), and features

		boolean allPresent = true;
		Enumeration enumeration = plugins.elements();

		while (enumeration.hasMoreElements()) {
			String plugin = (String) enumeration.nextElement();
			if (new File(install + "/plugins/" + plugin).exists())
				continue;
			else {
				missingPlugins.add(plugin);
				allPresent = false;
			}
		}

		enumeration = features.elements();

		while (enumeration.hasMoreElements()) {
			String feature = (String) enumeration.nextElement();
			if (new File(install + "/features/" + feature).exists())
				continue;
			else {
				missingFeatures.add(feature);
				allPresent = false;
			}
		}

		return allPresent;
	}

	/**
	 * Gets the install.
	 * @return Returns a String
	 */
	public String getInstall() {
		return install;
	}

	/**
	 * Gets the list.
	 * @return Returns a String
	 */
	public String getList() {
		return list;
	}

	/**
	 * Sets the install.
	 * @param install The install to set
	 */
	public void setInstall(String install) {
		this.install = install;
	}

	/**
	 * Sets the list.
	 * @param list The list to set
	 */
	public void setList(String list) {
		this.list = list;
	}

}