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/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2011, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.classic.boolex;

import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.boolex.EvaluationException;
import ch.qos.logback.core.boolex.EventEvaluatorBase;
import ch.qos.logback.core.util.FileUtil;
import groovy.lang.*;
import org.codehaus.groovy.control.CompilationFailedException;

/**
 * @author Ceki Gülcü
 */
public class GEventEvaluator extends EventEvaluatorBase {

  String expression;

  IEvaluator delegateEvaluator;
  Script script;

  public String getExpression() {
    return expression;
  }

  public void setExpression(String expression) {
    this.expression = expression;
  }

  public void start() {
    int errors = 0;
    if (expression == null || expression.length() == 0) {
      addError("Empty expression");
      return;
    } else {
      addInfo("Expression to evaluate [" + expression + "]");
    }


    ClassLoader classLoader = getClass().getClassLoader();
    String currentPackageName = this.getClass().getPackage().getName();
    currentPackageName = currentPackageName.replace('.', '/');

    String scriptText = FileUtil.resourceAsString(this, classLoader, currentPackageName + "/EvaluatorTemplate.groovy");
    if (scriptText == null) {
      return;
    }

    // insert the expression into script text
    scriptText = scriptText.replace("//EXPRESSION", expression);

    GroovyClassLoader gLoader = new GroovyClassLoader(classLoader);
    try {
      Class scriptClass = gLoader.parseClass(scriptText);

      GroovyObject goo = (GroovyObject) scriptClass.newInstance();
      delegateEvaluator = (IEvaluator) goo;

    } catch (CompilationFailedException cfe) {
      addError("Failed to compile expression [" + expression + "]", cfe);
      errors++;
    } catch (Exception e) {
      addError("Failed to compile expression [" + expression + "]", e);
      errors++;
    }
    if (errors == 0)
      super.start();
  }

  public boolean evaluate(ILoggingEvent event) throws NullPointerException, EvaluationException {
    if (delegateEvaluator == null) {
      return false;
    }
    return delegateEvaluator.doEvaluate(event);
  }


}