/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2013, 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.core.joran.conditional;


import java.util.Arrays;
import java.util.HashMap;
import java.util.Stack;

import ch.qos.logback.core.joran.action.PropertyAction;
import ch.qos.logback.core.joran.spi.ElementSelector;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import ch.qos.logback.core.Context;
import ch.qos.logback.core.ContextBase;
import ch.qos.logback.core.joran.TrivialConfigurator;
import ch.qos.logback.core.joran.action.Action;
import ch.qos.logback.core.joran.action.NOPAction;
import ch.qos.logback.core.joran.action.ext.StackAction;
import ch.qos.logback.core.joran.spi.JoranException;
import ch.qos.logback.core.status.StatusChecker;
import ch.qos.logback.core.testUtil.RandomUtil;
import ch.qos.logback.core.util.CoreTestConstants;
import ch.qos.logback.core.util.StatusPrinter;

import static org.junit.Assert.*;

public class IfThenElseTest {

  Context context = new ContextBase();
  StatusChecker checker = new StatusChecker(context);
  TrivialConfigurator tc;
  int diff = RandomUtil.getPositiveInt();
  static final String CONDITIONAL_DIR_PREFIX = CoreTestConstants.JORAN_INPUT_PREFIX
  + "conditional/";

  String ki1 = "ki1";
  String val1 = "val1";
  String sysKey = "sysKey";
  String dynaKey = "dynaKey";

  StackAction stackAction = new StackAction();

  @Before
  public void setUp() throws Exception {
    HashMap<ElementSelector, Action> rulesMap = new HashMap<ElementSelector, Action>();
    rulesMap.put(new ElementSelector("x"), new NOPAction());
    rulesMap.put(new ElementSelector("x/stack"), stackAction);
    rulesMap.put(new ElementSelector("x/property"), new PropertyAction());
    rulesMap.put(new ElementSelector("*/if"), new IfAction());
    rulesMap.put(new ElementSelector("*/if/then"), new ThenAction());
    rulesMap.put(new ElementSelector("*/if/then/*"), new NOPAction());
    rulesMap.put(new ElementSelector("*/if/else"), new ElseAction());
    rulesMap.put(new ElementSelector("*/if/else/*"), new NOPAction());

    tc = new TrivialConfigurator(rulesMap);
    tc.setContext(context);
  }

  @After
  public void tearDown() throws Exception {
    StatusPrinter.printIfErrorsOccured(context);
    System.clearProperty(sysKey);
  }

  @Test
  public void whenContextPropertyIsSet_IfThenBranchIsEvaluated() throws JoranException {
    context.putProperty(ki1, val1);
    tc.doConfigure(CONDITIONAL_DIR_PREFIX+"if0.xml");
    verifyConfig(new String[] {"BEGIN", "a", "END"});
  }

  @Test
  public void whenLocalPropertyIsSet_IfThenBranchIsEvaluated() throws JoranException {
    tc.doConfigure(CONDITIONAL_DIR_PREFIX+"if_localProperty.xml");
    verifyConfig(new String[] {"BEGIN", "a", "END"});
  }


  @Test
  public void whenNoPropertyIsDefined_ElseBranchIsEvaluated() throws JoranException {
    tc.doConfigure(CONDITIONAL_DIR_PREFIX+"if0.xml");
    verifyConfig(new String[] {"BEGIN", "b", "END"});
  }

  @Test
  public void whenContextPropertyIsSet_IfThenBranchIsEvaluated_NO_ELSE_DEFINED() throws JoranException {
    context.putProperty(ki1, val1);
    tc.doConfigure(CONDITIONAL_DIR_PREFIX+"ifWithoutElse.xml");
    verifyConfig(new String[] {"BEGIN", "a", "END"});
  }

  @Test
  public void whenNoPropertyIsDefined_IfThenBranchIsNotEvaluated_NO_ELSE_DEFINED() throws JoranException {
    tc.doConfigure(CONDITIONAL_DIR_PREFIX+"ifWithoutElse.xml");
    verifyConfig(new String[] {"BEGIN", "END"});
    assertTrue(checker.isErrorFree(0));
  }

  @Test
  public void nestedIf() throws JoranException {
    tc.doConfigure(CONDITIONAL_DIR_PREFIX+"nestedIf.xml");
    verifyConfig(new String[] {"BEGIN", "a", "c", "END"});
    assertTrue(checker.isErrorFree(0));
  }

  @Test
  public void useNonExistenceOfSystemPropertyToDefineAContextProperty() throws JoranException {
    assertNull(System.getProperty(sysKey));
    assertNull(context.getProperty(dynaKey));
    tc.doConfigure(CONDITIONAL_DIR_PREFIX+"ifSystem.xml");
    System.out.println(dynaKey+"="+context.getProperty(dynaKey));
    assertNotNull(context.getProperty(dynaKey));
  }

  @Test
  public void noContextPropertyShouldBeDefinedIfSystemPropertyExists() throws JoranException {
    System.setProperty(sysKey, "a");
    assertNull(context.getProperty(dynaKey));
    System.out.println("before "+dynaKey+"="+context.getProperty(dynaKey));
    tc.doConfigure(CONDITIONAL_DIR_PREFIX+"ifSystem.xml");
    System.out.println(dynaKey+"="+context.getProperty(dynaKey));
    assertNull(context.getProperty(dynaKey));
  }

  private void verifyConfig(String[] expected) {
    Stack<String> witness = new Stack<String>();
    witness.addAll(Arrays.asList(expected));
    assertEquals(witness, stackAction.getStack());
  }

}
