/*
 * Copyright (C) 2007-2012 Argeo GmbH
 *
 * 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 org.argeo.slc.lib.linux;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.io.FilenameUtils;
import org.apache.commons.io.IOUtils;
import org.argeo.slc.SlcException;
import org.argeo.slc.core.execution.tasks.SystemCall;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.core.io.Resource;

/** Call to the interpreter of a script language. */
public class ScriptCall extends SystemCall implements InitializingBean {
	private Resource script;
	private List<Object> scriptArgs = new ArrayList<Object>();

	private Boolean localScriptCopy = false;

	/** For use in Spring. */
	public ScriptCall() {
		super();
	}

	/** For use in code ({@link #init()} is called). */
	public ScriptCall(Resource script) {
		this.script = script;
		init();
	}

	public void init() {
		initInterpreter();
		for (Object obj : scriptArgs) {
			arg(obj.toString());
		}
	}

	public void afterPropertiesSet() throws Exception {
		init();
	}

	protected void initInterpreter() {
		String ext = FilenameUtils.getExtension(script.getFilename());

		if (localScriptCopy) {
			File scriptFile = copyScript();
			if ("sh".equals(ext))
				arg("/bin/sh").arg(scriptFile.getAbsolutePath());
			else if ("pl".equals(ext))
				arg("/usr/bin/perl").arg(scriptFile.getAbsolutePath());
			else if ("py".equals(ext))
				arg("/usr/bin/python").arg(scriptFile.getAbsolutePath());
			else
				throw new SlcException(
						"Cannot initialize script intepreter for " + script);
		} else {
			setStdInFile(script);
			if ("sh".equals(ext))
				arg("/bin/sh").arg("-s");
			else if ("pl".equals(ext))
				arg("/usr/bin/perl").arg("/dev/stdin");
			else if ("py".equals(ext))
				arg("/usr/bin/python").arg("-");
			else
				throw new SlcException(
						"Cannot initialize script intepreter for " + script);
		}
	}

	private File copyScript() {
		InputStream in = null;
		OutputStream out = null;
		try {
			File scriptFile = File.createTempFile("script", ".sh");
			scriptFile.deleteOnExit();
			in = script.getInputStream();
			out = new FileOutputStream(scriptFile);
			IOUtils.copy(in, out);
			return scriptFile;
		} catch (Exception e) {
			throw new SlcException("Cannot copy " + script, e);
		} finally {
			IOUtils.closeQuietly(in);
			IOUtils.closeQuietly(out);
		}
	}

	public void setScript(Resource script) {
		this.script = script;
	}

	public void setScriptArgs(List<Object> scriptArgs) {
		this.scriptArgs = scriptArgs;
	}

	public void setLocalScriptCopy(Boolean localScriptCopy) {
		this.localScriptCopy = localScriptCopy;
	}

}