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Easy worker communication of RPC-able objects
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/************************************************************************
 * %%Ignore-License
 * This is a part of gwtwwlinker project
 * https://github.com/tomekziel/gwtwwlinker 
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 **************************************************************************/
package prj.gwtwwlinker.workerlinker.code;

import java.util.Set;
import java.util.SortedSet;

import com.google.gwt.core.ext.LinkerContext;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.core.ext.linker.AbstractLinker;
import com.google.gwt.core.ext.linker.ArtifactSet;
import com.google.gwt.core.ext.linker.CompilationResult;
import com.google.gwt.core.ext.linker.ConfigurationProperty;
import com.google.gwt.core.ext.linker.LinkerOrder;
import com.google.gwt.dev.About;
import com.google.gwt.dev.util.DefaultTextOutput;

/**
 * This linker removes unnecessary GWT stuff to make the generated JS work inside HTML5 web worker
 * Part of https://github.com/tomekziel/gwtwwlinker 
 *
 * Derived from project Titaniumj Mobile, where it was described as 
 * "This linker removes unnecessary GWT stuff to
 * make the generated JS work inside Titanium
 * TiMobileHybridLinker.java is part of Ti4j 3.1.0 Copyright 2013 Emitrom LLC"
 * https://github.com/emitrom/titanium4j/blob/master/src/com/emitrom/ti4j/mobile/linker/TiMobileLinker.java 
 */
@LinkerOrder(LinkerOrder.Order.PRIMARY)
public class WorkerLinker extends AbstractLinker {

	public static final String OUTPUT_NAME_PROPERTY = "worker.filename";

	@Override
	public String getDescription() {
		return "gwtwwlinker - generate js for html5 web worker";
	}

	public ArtifactSet link(TreeLogger logger, LinkerContext context, ArtifactSet artifacts)
			throws UnableToCompleteException {

		ArtifactSet toReturn = new ArtifactSet(artifacts);
		DefaultTextOutput out = new DefaultTextOutput(true);
		long compilationTime = System.currentTimeMillis();
		out.print("(function(){");
		out.newline();

		// get compilation result
		Set results = artifacts.find(CompilationResult.class);
		if (results.size() == 0) {
			logger.log(TreeLogger.WARN, "Requested 0 permutations");
			return toReturn;
		}

		CompilationResult result = results.iterator().next();

		// get the generated javascript
		String[] javaScript = result.getJavaScript();
		out.print("var $wnd = self, $doc, $entry, $workergwtbridge, $moduleName, $moduleBase;");
		out.newline();
//		out.print("if(typeof(window) != 'undefined'){ $wnd = window;  $doc = $wnd.document; }");
//		out.newline();
//		out.print("else{ $wnd = {JSON: JSON}; }"); // gwtwwlinker - mind the $wnd.JSON passthrough used by autobeans
//		out.newline();
		out.print("var $gwt_version = \"" + About.getGwtVersionNum() + "\";");
		out.newlineOpt();
		out.print(javaScript[0]);
		out.newline();
		out.print("var $stats = function(){};");
		out.newline();
		out.print("var $sessionId = function(){};");
		out.newline();
//		out.print("var navigator = {};");
//		out.newline();
//		out.print("navigator.userAgent = 'timobile';");
//		out.newline();
		out.print("$strongName = '" + result.getStrongName() + "';");
		out.newline();
//		out.print("$ti4jCompilationDate = " + compilationTime + ";");
//		out.newline();
//		out.print("$wnd.Array = function(){};");
//		out.newline();

		// gwtwwlinker - register web worker message receiver and pass it to the bridge function
		// registered in SampleWorker class
//		out.print("self.addEventListener('message', $entry(function(e) {   $workergwtbridge(e.data); }), false);");
//		out.newline();

		out.print("gwtOnLoad(null,'" + context.getModuleName() + "',null);");
		out.newline();
		out.print("})();");
		out.newline();


		// gwtwwlinker - WARNING! You must take care of naming your result JS here
		// this demo doesn't care of multiple permutation and cache issues!

		String filename = getFilenamePropertyValue(context.getConfigurationProperties());

		toReturn.add(emitString(logger, out.toString(), filename));

		return toReturn;
	}

	private String getFilenamePropertyValue(SortedSet props) {
		for (ConfigurationProperty prop : props) {
			if (prop.getName().equals(OUTPUT_NAME_PROPERTY)) {
				return prop.getValues().get(0);
			}
		}

		throw new IllegalStateException("Can't find property " + OUTPUT_NAME_PROPERTY);
	}

}