/**
    * Copyright 2005-2014 The Kuali Foundation
    *
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    *
   * 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.kuali.rice.krad.datadictionary.validation.constraint;
  
  import org.kuali.rice.krad.datadictionary.parse.BeanTag;
  import org.kuali.rice.krad.datadictionary.parse.BeanTagAttribute;
  import org.kuali.rice.krad.datadictionary.validator.ValidationTrace;
  import org.kuali.rice.krad.messages.MessageService;
  import org.kuali.rice.krad.service.KRADServiceLocatorWeb;
  import org.kuali.rice.krad.uif.UifConstants;
  
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * Validation pattern for matching fixed point numbers, optionally matching negative numbers
   *
   * <p>
   * Only allows a numeric value where the precision property represents the maximum number of
   * total numbers allowed, and scale represents the minimum numbers after the decimal point.
   * The decimal places are implied to be 0 if not included and still count towards total
   * numbers allowed.
   * </p>
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  @BeanTag(name = "fixedPointPatternConstraint", parent = "FixedPointPatternConstraint")
  public class FixedPointPatternConstraint extends ValidDataPatternConstraint {
  
      protected boolean allowNegative;
      protected int precision;
      protected int scale;
  
      /**
       * Overriding retrieval of
       *
       * @see org.kuali.rice.krad.datadictionary.validation.constraint.ValidCharactersPatternConstraint#getRegexString()
       */
      @Override
      protected String getRegexString() {
          StringBuilder regex = new StringBuilder();
  
          if (getPrecision() < 0 || getScale() < 0 || getPrecision() - getScale() < 0){
              throw new RuntimeException("Precision and scale cannot be negative AND scale cannot be greater than "
                      + "precision for FixedPointPatternConstraints!");
          }
  
          if (isAllowNegative()) {
              regex.append("-?");
          }
          // final pattern will be: -?([0-9]{0,p-s}\.[0-9]{1,s}|[0-9]{1,p-s}) where p = precision, s=scale
  
          regex.append("(");
          if(getPrecision() - getScale() > 0){
              regex.append("[0-9]{0," + (getPrecision() - getScale()) + "}");
          }
          regex.append("\\.");
          regex.append("[0-9]{1," + getScale() + "}");
          if(getPrecision() - getScale() > 0){
              regex.append("|[0-9]{1," + (getPrecision() - getScale()) + "}");
          }
          regex.append(")");
          return regex.toString();
      }
  
      /**
       * @return the allowNegative
       */
      @BeanTagAttribute(name = "allowNegative")
      public boolean isAllowNegative() {
          return this.allowNegative;
      }
  
      /**
       * @param allowNegative the allowNegative to set
       */
      public void setAllowNegative(boolean allowNegative) {
          this.allowNegative = allowNegative;
      }
  
      /**
       * @return the precision
       */
      @BeanTagAttribute(name = "precision")
      public int getPrecision() {
          return this.precision;
     }
 
     /**
      * @param precision the precision to set
      */
     public void setPrecision(int precision) {
         this.precision = precision;
     }
 
     /**
      * @return the scale
      */
     @BeanTagAttribute(name = "scale")
     public int getScale() {
         return this.scale;
     }
 
     /**
      * @param scale the scale to set
      */
     public void setScale(int scale) {
         this.scale = scale;
     }
 
     /**
      * This overridden method ...
      *
      * @see org.kuali.rice.krad.datadictionary.validation.constraint.ValidDataPatternConstraint#getValidationMessageParams()
      */
     @Override
     public List<String> getValidationMessageParams() {
         if (validationMessageParams == null) {
             validationMessageParams = new ArrayList<String>();
             MessageService messageService = KRADServiceLocatorWeb.getMessageService();
             if (allowNegative) {
                 validationMessageParams.add(messageService.getMessageText(
                         UifConstants.Messages.VALIDATION_MSG_KEY_PREFIX + "positiveOrNegative"));
             } else {
                 validationMessageParams.add(messageService.getMessageText(
                         UifConstants.Messages.VALIDATION_MSG_KEY_PREFIX + "positiveOrZero"));
             }
 
             validationMessageParams.add(Integer.toString(precision));
             validationMessageParams.add(Integer.toString(scale));
         }
         return validationMessageParams;
     }
 
     /**
      * Validates different requirements of component compiling a series of reports detailing information on errors
      * found in the component.  Used by the RiceDictionaryValidator.
      *
      * @param tracer Record of component's location
      */
     @Override
     public void completeValidation(ValidationTrace tracer) {
         tracer.addBean("FixedPointPatternConstraint", getMessageKey());
 
         if (getPrecision() <= getScale()) {
             String currentValues[] = {"precision =" + getPrecision(), "scale = " + getScale()};
             tracer.createError("Precision should greater than Scale", currentValues);
         }
 
         super.completeValidation(tracer.getCopy());
     }
 
 }