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package de.swm.gwt.linker;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.List;
import java.util.Set;

/**
 * Writing a manifest file from a given set of resources
 * 
 * @author Daniel Kurka (see http://code.google.com/p/mgwt/)
 * 
 * Modified by Guido Wimmel (SWM Services GmbH):
 * output resources in sorted order
 */
public class ManifestWriter {
        /**
         * Write a manifest file for the given set of artifacts and return it as a
         * string
         * 
         * @param staticResources - the static resources of the app, such as
         *            index.html file
         * @param cacheResources the gwt output artifacts like cache.html files
         * @return the manifest as a string
         */
        public String writeManifest(Set staticResources, Set cacheResources) {
                if (staticResources == null)
                        throw new IllegalArgumentException("staticResources can not be null");
                if (cacheResources == null)
                        throw new IllegalArgumentException("cacheResources can not be null");

                StringBuilder sb = new StringBuilder();
                sb.append("CACHE MANIFEST\n");
                //build something unique so that the manifest file changes on recompile
                sb.append("# Unique id #" + (new Date()).getTime() + "." + Math.random() + "\n");
                sb.append("\n");
                sb.append("CACHE:\n");
                sb.append("# Static app files\n");
                
                for (String resources : sort(staticResources)) {
                        sb.append(resources + "\n");
                }

                sb.append("\n# GWT compiled files\n");
                for (String resources : sort(cacheResources)) {
                        sb.append(resources + "\n");
                }

                sb.append("\n\n");
                sb.append("# All other resources require the client to be online.\n");
                sb.append("NETWORK:\n");
                sb.append("*\n");
                return sb.toString();
        }
        
        private List sort(Set stringSet) {
        	List stringList = new ArrayList(stringSet);
        	Collections.sort(stringList);
        	return stringList;
        }
}