/**
 * 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.util;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;

import java.util.HashMap;
import java.util.Map;

import ch.qos.logback.core.joran.spi.InterpretationContext;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;

import ch.qos.logback.core.Context;
import ch.qos.logback.core.ContextBase;
import ch.qos.logback.core.joran.spi.JoranException;


public class OptionHelperTest  {

  @Rule
  public ExpectedException expectedException = ExpectedException.none();

  String text = "Testing ${v1} variable substitution ${v2}";
  String expected = "Testing if variable substitution works";
  Context context = new ContextBase();
  Map<String, String> secondaryMap;
  
  
  
  @Before
  public void setUp() throws Exception {
    secondaryMap = new HashMap<String, String>();
  }

  @Test
  public void testLiteral() {
    String noSubst = "hello world";
    String result = OptionHelper.substVars(noSubst, context);
    assertEquals(noSubst, result);
  }

  @Test
  public void testUndefinedValues() {
    String withUndefinedValues = "${axyz}";
    
    String result = OptionHelper.substVars(withUndefinedValues, context);
    assertEquals("axyz"+OptionHelper._IS_UNDEFINED, result);
  }
  
  @Test
  public void testSubstVarsVariableNotClosed() {
    String noSubst = "testing if ${v1 works";
    
    try {
      @SuppressWarnings("unused")
      String result = OptionHelper.substVars(noSubst, context);
      fail();
    } catch (IllegalArgumentException e) {
      //ok
    }
  }
  @Test
  public void testSubstVarsContextOnly() {
    context.putProperty("v1", "if");
    context.putProperty("v2", "works");
    
    String result = OptionHelper.substVars(text, context);
    assertEquals(expected, result); 
  }
  
  @Test
  public void testSubstVarsSystemProperties() { 
    System.setProperty("v1", "if");
    System.setProperty("v2", "works");
    
    String result = OptionHelper.substVars(text, context);
    assertEquals(expected, result); 
    
    System.clearProperty("v1");
    System.clearProperty("v2");
  }
  
  @Test
  public void testSubstVarsWithDefault() {   
    context.putProperty("v1", "if");
    String textWithDefault = "Testing ${v1} variable substitution ${v2:-toto}";
    String resultWithDefault = "Testing if variable substitution toto";
    
    String result = OptionHelper.substVars(textWithDefault, context);
    assertEquals(resultWithDefault, result); 
  }
  
  @Test
  public void testSubstVarsRecursive() {
    context.putProperty("v1", "if");
    context.putProperty("v2", "${v3}");
    context.putProperty("v3", "works");
    
    String result = OptionHelper.substVars(text, context);
    assertEquals(expected, result); 
  }

  @Test
  public void testSubstVarsTwoLevelsDeep() {
    context.putProperty("v1", "if");
    context.putProperty("v2", "${v3}");
    context.putProperty("v3", "${v4}");
    context.putProperty("v4", "works");

    String result = OptionHelper.substVars(text, context);
    assertEquals(expected, result);
  }

  @Test
  public void testSubstVarsTwoLevelsWithDefault() {
    // Example input taken from LOGBCK-943 bug report
    context.putProperty("APP_NAME", "LOGBACK");
    context.putProperty("ARCHIVE_SUFFIX", "archive.log");
    context.putProperty("LOG_HOME", "${logfilepath.default:-logs}");
    context.putProperty("ARCHIVE_PATH", "${LOG_HOME}/archive/${APP_NAME}");

    String result = OptionHelper.substVars("${ARCHIVE_PATH}_trace_${ARCHIVE_SUFFIX}", context);
    assertEquals("logs/archive/LOGBACK_trace_archive.log", result);
  }


  @Test(timeout = 1000)
  public void stubstVarsShouldNotGoIntoInfiniteLoop() {
    context.putProperty("v1", "if");
    context.putProperty("v2", "${v3}");
    context.putProperty("v3", "${v4}");
    context.putProperty("v4", "${v2}c");

    expectedException.expect(Exception.class);
    OptionHelper.substVars(text, context);
  }

  @Test
  public void nonCircularGraphShouldWork() {
    context.putProperty("A", "${B} and ${C}");
    context.putProperty("B", "${B1}");
    context.putProperty("B1", "B1-value");
    context.putProperty("C", "${C1} and ${B}");
    context.putProperty("C1", "C1-value");

    String result = OptionHelper.substVars("${A}", context);
    assertEquals("B1-value and C1-value and B1-value", result);
  }

  @Test(timeout = 1000)
  public void detectCircularReferences0() {
    context.putProperty("A", "${A}");

    expectedException.expect(IllegalArgumentException.class);
    expectedException.expectMessage("Circular variable reference detected while parsing input [${A} --> ${A}]");
    OptionHelper.substVars("${A}", context);
  }

  @Test(timeout = 1000)
  public void detectCircularReferences1() {
    context.putProperty("A", "${A}a");

    expectedException.expect(IllegalArgumentException.class);
    expectedException.expectMessage("Circular variable reference detected while parsing input [${A} --> ${A}]");
    OptionHelper.substVars("${A}", context);
  }

  @Test(timeout = 1000)
  public void detectCircularReferences2() {
    context.putProperty("A", "${B}");
    context.putProperty("B", "${C}");
    context.putProperty("C", "${A}");

    expectedException.expect(IllegalArgumentException.class);
    expectedException.expectMessage("Circular variable reference detected while parsing input [${A} --> ${B} --> ${C} --> ${A}]");
    OptionHelper.substVars("${A}", context);
  }


  @Test
  public void detectCircularReferencesInDefault() {
    context.putProperty("A", "${B:-${A}}");
    expectedException.expect(IllegalArgumentException.class);
    expectedException.expectMessage("Circular variable reference detected while parsing input [${A} --> ${B} --> ${A}]");
    OptionHelper.substVars("${A}", context);
  }

  @Test(timeout = 1000)
  public void detectCircularReferences3() {
    context.putProperty("A", "${B}");
    context.putProperty("B", "${C}");
    context.putProperty("C", "${A}");

    expectedException.expect(IllegalArgumentException.class);
    expectedException.expectMessage("Circular variable reference detected while parsing input [${B} --> ${C} --> ${A} --> ${B}]");
    OptionHelper.substVars("${B} ", context);
  }

  @Test(timeout = 1000)
  public void detectCircularReferences4() {
    context.putProperty("A", "${B}");
    context.putProperty("B", "${C}");
    context.putProperty("C", "${A}");

    expectedException.expect(IllegalArgumentException.class);
    expectedException.expectMessage("Circular variable reference detected while parsing input [${C} --> ${A} --> ${B} --> ${C}]");
    OptionHelper.substVars("${C} and ${A}", context);
  }

  @Test
  public void detectCircularReferences5() {
    context.putProperty("A", "${B} and ${C}");
    context.putProperty("B", "${B1}");
    context.putProperty("B1", "B1-value");
    context.putProperty("C", "${C1}");
    context.putProperty("C1", "here's the loop: ${A}");

    expectedException.expect(IllegalArgumentException.class);
    expectedException.expectMessage("Circular variable reference detected while parsing input [${A} --> ${C} --> ${C1} --> ${A}]");
    String result = OptionHelper.substVars("${A}", context);
    System.err.println(result);
  }

  @Test
  public void defaultValueReferencingAVariable() {
    context.putProperty("v1", "k1");
    String result = OptionHelper.substVars("${undef:-${v1}}", context);
    assertEquals("k1", result);
  }

  @Test
  public void jackrabbit_standalone() {
    String r = OptionHelper.substVars("${jackrabbit.log:-${repo:-jackrabbit}/log/jackrabbit.log}", context);
    assertEquals("jackrabbit/log/jackrabbit.log", r);
  }

  @Test
  public void doesNotThrowNullPointerExceptionForEmptyVariable() throws JoranException {
    context.putProperty("var", "");
    OptionHelper.substVars("${var}", context);

  }

}
