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/*
 * #%L
 * The AIBench Shell Plugin
 * %%
 * Copyright (C) 2006 - 2017 Daniel Glez-Peña and Florentino Fdez-Riverola
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */
package es.uvigo.ei.sing.aibench.shell;

import bsh.EvalError;
import bsh.Interpreter;
import bsh.util.JConsole;

public class AIBenchInterpreter {
	private static volatile AIBenchInterpreter instance = null;

	public static AIBenchInterpreter getInstance() {
		if (AIBenchInterpreter.instance == null)
			AIBenchInterpreter.createInstance();
		
		return AIBenchInterpreter.instance;
	}
	
	private synchronized static void createInstance() {
		if (AIBenchInterpreter.instance == null)
			AIBenchInterpreter.instance = new AIBenchInterpreter();
	}

	private Interpreter interpreter = null;
	private JConsole jConsole = new JConsole();

	public JConsole getConsole() {
		return jConsole;
	}

	private int port = -1;

	public void server(int port) {
		this.port = port;
		try {
			synchronized (this) {
				if (this.interpreter == null) {
					this.wait();
				}
			}
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		try {
			this.interpreter.eval("server(" + port + ");");
		} catch (EvalError e) {
			e.printStackTrace();
		}
	}

	private AIBenchInterpreter() {
		this.jConsole.setFont(new java.awt.Font("Monospaced",
				java.awt.Font.PLAIN, 11));

		Runnable robustInterpreter = new Runnable() {
			public void run() {
				while (true) {
					// Interpreter interpreter =
					// null;

					synchronized (AIBenchInterpreter.this) {
						interpreter = new Interpreter(jConsole);
						interpreter.setClassLoader(ShellFrame.class.getClassLoader());
						try {
							interpreter.eval("import es.uvigo.ei.aibench.core.*;");
							interpreter.eval("import es.uvigo.ei.aibench.workbench.*;");
							interpreter.eval("import es.uvigo.ei.sing.aibench.shell.*;");
							interpreter.eval(findOperationCommand);
							interpreter.eval(findEnumCommand);
							interpreter.eval("importCommands(\"commands\");");
						} catch (EvalError e) {
							e.printStackTrace();
						}
						// interpreter.setConsole(jConsole);

						if (port != -1) {
							try {
								interpreter.eval("server(" + port + ");");
							} catch (EvalError e) {
								e.printStackTrace();
							}
						}
						AIBenchInterpreter.this.notifyAll();
					}

					Thread weak = new Thread(interpreter);
					weak.setName("BshInterpreter");
					weak.start();
					try {
						weak.join();
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
			}
		};
		Thread robust = new Thread(robustInterpreter);
		robust.setName("BshRobust");
		robust.start(); // start a thread to call the run()
		// method*/

		// wait until we have the first interpreter
		try {
			synchronized (this) {
				if (interpreter == null) {
					this.wait();
				}
			}
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		// Capture the application log
	}

	// some hard-coded commands, that's horrible!
	private String findOperationCommand = "findOperation(id){"
			+ "operations  = Core.getInstance().getOperations();"
			+ "for(int i =0; i