/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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.apache.myfaces.tobago.model;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import javax.faces.event.ActionEvent;
  import java.util.ArrayList;
  import java.util.List;
  
  public class Wizard {
  
    private static final Logger LOG = LoggerFactory.getLogger(Wizard.class);
  
    private int index;
  
    private List<WizardStep> course;
  
    public Wizard() {
      reset();
    }
  
    public void next(ActionEvent event) {
      LOG.debug("next: " + event);
  
      index++;
    }
  
    public void gotoStep(ActionEvent event) {
      Object step = (event.getComponent().getAttributes().get("step"));
      if (step instanceof Integer) {
        index = (Integer) step;
      } else { // todo: The JSP Tag uses String in the moment
        index = Integer.parseInt((String) step);
      }
  
      LOG.debug("gotoStep: " + index);
    }
  
    public String previous() {
      String outcome = getPreviousStep().getOutcome();
      if (index > 0) {
        index--;
      } else {
        LOG.error("Previous not available!");
      }
  
      LOG.debug("gotoStep: " + index);
      return outcome;
    }
  
    public final boolean isPreviousAvailable() {
      return getIndex() > 0;
    }
  
    public final void finish(ActionEvent event) {
      if (LOG.isDebugEnabled()) {
        LOG.debug("finish");
      }
  
      reset();
    }
  
    public final void cancel(ActionEvent event) {
      if (LOG.isDebugEnabled()) {
        LOG.debug("cancel");
      }
      reset();
    }
  
    public final int getIndex() {
      return index;
    }
  
    /**
     * Helper method to reset attributes
     */
    public void reset() {
      index = 0;
      course = new ArrayList<WizardStep>();
    }
 
   public List<WizardStep> getCourse() {
     return course;
   }
 
   public int getSize() {
     return course.size();
   }
 
   public void register() {
 
     if (index == course.size()) { // this is a new page
       course.add(new WizardStep(index));
     } else if (index < course.size()) {
       course.set(index, new WizardStep(index));
     } else {
       throw new IllegalStateException("Index too large for course: index="
           + index + " course.size()=" + course.size());
     }
     if (LOG.isInfoEnabled()) {
       LOG.info("course: " + course);
     }
   }
 
   public WizardStep getPreviousStep() {
     if (index > 0) {
       return course.get(index - 1);
     } else {
       return null;
     }
   }
   public WizardStep getCurrentStep() {
       return course.get(index);
   }
 
   public void removeForwardSteps() {
     // todo
     LOG.error("Not implemented yet");
   }
 }