/*
 * #%L
 * ImageJ software for multidimensional image processing and analysis.
 * %%
 * Copyright (C) 2009 - 2013 Board of Regents of the University of
 * Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
 * Institute of Molecular Cell Biology and Genetics.
 * %%
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 * The views and conclusions contained in the software and documentation are
 * those of the authors and should not be interpreted as representing official
 * policies, either expressed or implied, of any organization.
 * #L%
 */

package imagej.script;

import imagej.module.AbstractModule;
import imagej.module.Module;
import imagej.module.ModuleItem;

import java.io.FileReader;
import java.io.Reader;

import javax.script.ScriptEngine;
import javax.script.ScriptException;

import org.scijava.Context;
import org.scijava.Contextual;
import org.scijava.log.LogService;
import org.scijava.plugin.Parameter;
import org.scijava.util.ConversionUtils;
import org.scijava.util.FileUtils;

/**
 * A {@link Module} which executes a script.
 * 
 * @author Curtis Rueden
 * @author Johannes Schindelin
 */
public class ScriptModule extends AbstractModule implements Contextual {

	public static final String RETURN_VALUE = "result";

	private final ScriptInfo info;

	@Parameter
	private Context context;

	@Parameter
	private ScriptService scriptService;

	@Parameter
	private LogService log;

	private ScriptEngine scriptEngine;

	public ScriptModule(final ScriptInfo info) {
		this.info = info;
	}

	// -- ScriptModule methods --

	/** Gets the script engine used to execute the script. */
	public ScriptEngine getEngine() {
		if (scriptEngine == null) {
			final String path = getInfo().getPath();
			final String fileExtension = FileUtils.getExtension(path);
			final ScriptLanguage language =
					scriptService.getByFileExtension(fileExtension);
			scriptEngine = language.getScriptEngine();
		}
		return scriptEngine;
	}

	/** Gets the return value of the script. */
	public Object getReturnValue() {
		return getOutput(RETURN_VALUE);
	}

	// -- Module methods --

	@Override
	public ScriptInfo getInfo() {
		return info;
	}

	// -- Runnable methods --

	@Override
	public void run() {
		final ScriptEngine engine = getEngine();
		final String path = getInfo().getPath();

		// initialize the script engine
		// TODO: Handle stdout and stderr writers better.
		scriptService.initialize(engine, path, null, null);

		// populate bindings with the input values
		for (final ModuleItem<?> item : getInfo().inputs()) {
			final String name = item.getName();
			engine.put(name, getInput(name));
		}

		// execute script!
		try {
			final Reader reader = getInfo().getReader();
			final Object returnValue;
			if (reader == null) returnValue = engine.eval(new FileReader(path));
			else returnValue = engine.eval(reader);
			setOutput(RETURN_VALUE, returnValue);
		}
		catch (final ScriptException e) {
			log.error(e.getCause());
		}
		catch (final Throwable e) {
			log.error(e);
		}

		// populate output values
		for (final ModuleItem<?> item : getInfo().outputs()) {
			final String name = item.getName();
			final Object value =
				ConversionUtils.convert(engine.get(name), item.getType());
			setOutput(name, value);
		}
	}

	// -- Contextual methods --

	@Override
	public Context getContext() {
		return context;
	}

	@Override
	public void setContext(Context context) {
		context.inject(this);
	}

}

@@ -2676,16 +2676,56 @@
 e log;%0A%0A
+%09private ScriptLanguage scriptLanguage;%0A
 %09private
@@ -2879,31 +2879,23 @@
 ript
- engine used to execute
+ing language of
  the
@@ -2924,23 +2924,27 @@
 ript
-Engine getEngin
+Language getLanguag
 e() 
@@ -2957,21 +2957,23 @@
  (script
-Engin
+Languag
 e == nul
@@ -3086,23 +3086,17 @@
 th);%0A%09%09%09
-final S
+s
 criptLan
@@ -3105,24 +3105,10 @@
 age 
-language =%0A%09%09%09%09%09
+= 
 scri
@@ -3158,32 +3158,194 @@
 ;%0A%09%09
-%09scriptEngine = l
+%7D%0A%09%09return scriptLanguage;%0A%09%7D%0A%0A%09/** Gets the script engine used to execute the script. */%0A%09public ScriptEngine getEngine() %7B%0A%09%09if (scriptEngine == null) %7B%0A%09%09%09scriptEngine = getL
 anguage
+()
 .get

add getLanguage accessor