/* Licensed 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.activiti.rest.api;

import java.text.SimpleDateFormat;
import java.util.Date;

import org.activiti.engine.ActivitiException;
import org.restlet.data.Form;

/**
 * @author Tijs Rademakers
 */
public class RequestUtil {
  
  private static final SimpleDateFormat shortDateFormat = new SimpleDateFormat("yyyy-MM-dd");
  private static final SimpleDateFormat longDateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssz");

  public static boolean getBoolean(Form form, String name, boolean defaultValue) {
    boolean value = defaultValue;
    if(form.getValues(name) != null) {
      value = Boolean.valueOf(form.getValues(name));
    }
    return value;
  }
  
  public static int getInteger(Form form, String name, int defaultValue) {
    int value = defaultValue;
    if(form.getValues(name) != null) {
      value = Integer.valueOf(form.getValues(name));
    }
    return value;
  }
  
  public static Date getDate(Form form, String name) {
    Date value = null;
    if(form.getValues(name) != null) {
      
      String input = form.getValues(name);
      
      //this is zero time so we need to add that TZ indicator for 
      if (input.endsWith("Z")) {
        input = input.substring( 0, input.length() - 1) + "GMT-00:00";
      } else {
        int inset = 6;
    
        String s0 = input.substring(0, input.length() - inset);
        String s1 = input.substring(input.length() - inset, input.length());

        input = s0 + "GMT" + s1;
      }
      
      try {
        value = longDateFormat.parse(input);
      } catch(Exception e) {
        throw new ActivitiException("Failed to parse date " + input);
      }
    }
    return value;
  }
  
  public static String dateToString(Date date) {
    String dateString = null;
    if(date != null) {
      dateString = longDateFormat.format(date);
    }
    
    return dateString;
  }
  
  public static Integer parseToInteger(String integer) {
    Integer parsedInteger = null;
    try {
      parsedInteger = Integer.parseInt(integer);
    } catch(Exception e) {}
    return parsedInteger;
  }
  
  public static Date parseToDate(String date) {
    Date parsedDate = null;
    try {
      parsedDate = shortDateFormat.parse(date);
    } catch(Exception e) {}
    return parsedDate;
  }
}