/*
    * Copyright 2008 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.ole.module.purap.document.validation.impl;
  
  import org.apache.commons.lang.StringUtils;
  import org.kuali.ole.module.purap.PurapConstants;
  import org.kuali.ole.module.purap.PurapConstants.PREQDocumentsStrings;
  import org.kuali.ole.module.purap.PurapKeyConstants;
  import org.kuali.ole.module.purap.PurapPropertyConstants;
  import org.kuali.ole.module.purap.businessobject.LineItemReceivingItem;
  import org.kuali.ole.module.purap.businessobject.PurapEnterableItem;
  import org.kuali.ole.module.purap.businessobject.ReceivingItem;
  import org.kuali.ole.module.purap.document.LineItemReceivingDocument;
  import org.kuali.ole.module.purap.document.ReceivingDocument;
  import org.kuali.ole.module.purap.document.service.ReceivingService;
  import org.kuali.ole.module.purap.document.validation.AddReceivingItemRule;
  import org.kuali.ole.module.purap.document.validation.ContinuePurapRule;
  import org.kuali.ole.sys.OLEKeyConstants;
  import org.kuali.ole.sys.OLEPropertyConstants;
  import org.kuali.ole.sys.businessobject.UnitOfMeasure;
  import org.kuali.ole.sys.context.SpringContext;
  import org.kuali.rice.kns.rules.DocumentRuleBase;
  import org.kuali.rice.kns.service.DataDictionaryService;
  import org.kuali.rice.kns.service.DictionaryValidationService;
  import org.kuali.rice.krad.document.Document;
  import org.kuali.rice.krad.document.TransactionalDocument;
  import org.kuali.rice.krad.service.BusinessObjectService;
  import org.kuali.rice.krad.util.GlobalVariables;
  import org.kuali.rice.krad.util.ObjectUtils;
  
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  public class LineItemReceivingDocumentRule extends DocumentRuleBase implements ContinuePurapRule, AddReceivingItemRule {
  
      private static org.apache.log4j.Logger LOG = org.apache.log4j.Logger.getLogger(LineItemReceivingDocumentRule.class);
  
      @Override
      protected boolean processCustomRouteDocumentBusinessRules(Document document) {
          LOG.debug("Inside processCustomRouteDocumentBusinessRules of LineItemReceivingDocumentRule");
          boolean valid = true;
          LineItemReceivingDocument lineItemReceivingDocument = (LineItemReceivingDocument) document;
          if (LOG.isDebugEnabled())
              LOG.debug("LineItemReceivingDocument :" + lineItemReceivingDocument);
  
          GlobalVariables.getMessageMap().clearErrorPath();
          GlobalVariables.getMessageMap().addToErrorPath(OLEPropertyConstants.DOCUMENT);
  
          valid &= super.processCustomRouteDocumentBusinessRules(document);
          valid &= canCreateLineItemReceivingDocument(lineItemReceivingDocument);
          valid &= isAtLeastOneItemEntered(lineItemReceivingDocument);
          valid &= validateItemUnitOfMeasure(lineItemReceivingDocument);
  
          //  makes sure all of the lines adhere to the rule that quantityDamaged and 
          // quantityReturned cannot (each) equal more than the quantityReceived
          valid &= validateAllReceivingLinesHaveSaneQuantities(lineItemReceivingDocument);
          if (LOG.isDebugEnabled())
              LOG.debug("isValid from LineItemReceivingDocumentRule :" + valid);
  
          return valid;
      }
  
      /**
       * TODO: move this up
       * This method...
       *
       * @param receivingDocument
       * @return
       */
      protected boolean isAtLeastOneItemEntered(ReceivingDocument receivingDocument) {
          if (LOG.isDebugEnabled()) {
              LOG.debug("Inside isAtLeastOneItemEntered of LineItemReceivingDocumentRule");
              LOG.debug("Number of Items :" + receivingDocument.getItems().size());
          }
          for (ReceivingItem item : (List<ReceivingItem>) receivingDocument.getItems()) {
              if (((PurapEnterableItem) item).isConsideredEntered()) {
                  //if any item is entered return true
                  return true;
              }
          }
          //if no items are entered return false
          GlobalVariables.getMessageMap().putError(PurapConstants.ITEM_TAB_ERROR_PROPERTY, PurapKeyConstants.ERROR_RECEIVING_LINEITEM_REQUIRED);
          return false;
  
      }
 
     public boolean processContinuePurapBusinessRules(TransactionalDocument document) {
 
         boolean valid = true;
         LineItemReceivingDocument lineItemReceivingDocument = (LineItemReceivingDocument) document;
 
         GlobalVariables.getMessageMap().clearErrorPath();
         GlobalVariables.getMessageMap().addToErrorPath(OLEPropertyConstants.DOCUMENT);
 
         valid &= hasRequiredFieldsForContinue(lineItemReceivingDocument);
         //only do this if valid
         if (valid) {
             valid &= canCreateLineItemReceivingDocument(lineItemReceivingDocument);
         }
 
         return valid;
     }
 
     /**
      * Make sure the required fields on the init screen are filled in.
      *
      * @param lineItemReceivingDocument
      * @return
      */
     protected boolean hasRequiredFieldsForContinue(LineItemReceivingDocument lineItemReceivingDocument) {
 
         boolean valid = true;
 
         if (ObjectUtils.isNull(lineItemReceivingDocument.getPurchaseOrderIdentifier())) {
             GlobalVariables.getMessageMap().putError(PurapPropertyConstants.PURCHASE_ORDER_IDENTIFIER, OLEKeyConstants.ERROR_REQUIRED, PREQDocumentsStrings.PURCHASE_ORDER_ID);
             valid &= false;
         }
 
         if (ObjectUtils.isNull(lineItemReceivingDocument.getShipmentReceivedDate())) {
             GlobalVariables.getMessageMap().putError(PurapPropertyConstants.SHIPMENT_RECEIVED_DATE, OLEKeyConstants.ERROR_REQUIRED, PurapConstants.LineItemReceivingDocumentStrings.VENDOR_DATE);
             valid &= false;
         }
 
         return valid;
     }
 
     /**
      * Determines if it is valid to create a receiving line document.  Only one
      * receiving line document can be active at any time per purchase order document.
      *
      * @param lineItemReceivingDocument
      * @return
      */
     protected boolean canCreateLineItemReceivingDocument(LineItemReceivingDocument lineItemReceivingDocument) {
 
         boolean valid = true;
 
         if (SpringContext.getBean(ReceivingService.class).canCreateLineItemReceivingDocument(lineItemReceivingDocument.getPurchaseOrderIdentifier(), lineItemReceivingDocument.getDocumentNumber()) == false) {
             valid &= false;
             GlobalVariables.getMessageMap().putError(PurapPropertyConstants.PURCHASE_ORDER_IDENTIFIER, PurapKeyConstants.ERROR_RECEIVING_LINE_DOCUMENT_ACTIVE_FOR_PO, lineItemReceivingDocument.getDocumentNumber(), lineItemReceivingDocument.getPurchaseOrderIdentifier().toString());
         }
 
         return valid;
     }
 
     /**
      * Validates that if the item type is quantity based, the unit of measure is required.
      */
     protected boolean validateItemUnitOfMeasure(ReceivingDocument receivingDocument) {
         boolean valid = true;
         for (ReceivingItem item : (List<ReceivingItem>) receivingDocument.getItems()) {
             // Validations for quantity based item type
             if (item.getItemType().isQuantityBasedGeneralLedgerIndicator()) {
                 String uomCode = item.getItemUnitOfMeasureCode();
                 if (StringUtils.isEmpty(uomCode)) {
                     valid = false;
                     String attributeLabel = SpringContext.getBean(DataDictionaryService.class).getDataDictionary().getBusinessObjectEntry(item.getClass().getName()).getAttributeDefinition(OLEPropertyConstants.ITEM_UNIT_OF_MEASURE_CODE).getLabel();
                     GlobalVariables.getMessageMap().putError(OLEPropertyConstants.ITEM_UNIT_OF_MEASURE_CODE, OLEKeyConstants.ERROR_REQUIRED, attributeLabel + item.getItemUnitOfMeasureCode());
                 } else {
                     // Find out whether the unit of measure code has existed in the database
                     Map<String, String> fieldValues = new HashMap<String, String>();
                     fieldValues.put(OLEPropertyConstants.ITEM_UNIT_OF_MEASURE_CODE, item.getItemUnitOfMeasureCode());
                     if (SpringContext.getBean(BusinessObjectService.class).countMatching(UnitOfMeasure.class, fieldValues) != 1) {
                         // This is the case where the unit of measure code on the item does not exist in the database.
                         valid = false;
                         GlobalVariables.getMessageMap().putError(OLEPropertyConstants.ITEM_UNIT_OF_MEASURE_CODE, PurapKeyConstants.PUR_ITEM_UNIT_OF_MEASURE_CODE_INVALID, item.getItemUnitOfMeasureCode());
                     }
                 }
             }
         }
         return valid;
     }
 
     /**
      * @see org.kuali.ole.module.purap.document.validation.AddReceivingItemRule#processAddReceivingItemRules(org.kuali.ole.module.purap.document.ReceivingDocument, org.kuali.ole.module.purap.businessobject.ReceivingItem)
      */
     public boolean processAddReceivingItemRules(ReceivingDocument document, LineItemReceivingItem item, String errorPathPrefix) {
         boolean valid = true;
 
         valid &= SpringContext.getBean(DictionaryValidationService.class).isBusinessObjectValid(item, errorPathPrefix);
 
         //  test that the amount entered in the QuantityReturned and/or QuantityDamaged fields dont 
         // either equal more than the QuantityReceived.  In other words, you can only return or mark as 
         // damaged those that are received.  It doesnt make sense to receive 2 but return 3.  
         valid &= validateQuantityReturnedNotMoreThanReceived(document, item, errorPathPrefix, new Integer(0));
         valid &= validateQuantityDamagedNotMoreThanReceived(document, item, errorPathPrefix, new Integer(0));
 
         return valid;
     }
 
     protected boolean validateQuantityReturnedNotMoreThanReceived(ReceivingDocument document, LineItemReceivingItem item, String errorPathPrefix, Integer lineNumber) {
         if (item.getItemReturnedTotalQuantity() != null && item.getItemReceivedTotalQuantity() != null) {
             if (item.getItemReturnedTotalQuantity().isGreaterThan(item.getItemReceivedTotalQuantity())) {
                 GlobalVariables.getMessageMap().putError(PurapConstants.ITEM_TAB_ERROR_PROPERTY, PurapKeyConstants.ERROR_RECEIVING_LINE_QTYRETURNED_GT_QTYRECEIVED, (lineNumber.intValue() == 0 ? "Add Line" : lineNumber.toString()));
                 return false;
             }
         }
         return true;
     }
 
     protected boolean validateQuantityDamagedNotMoreThanReceived(ReceivingDocument document, LineItemReceivingItem item, String errorPathPrefix, Integer lineNumber) {
         if (item.getItemDamagedTotalQuantity() != null && item.getItemReceivedTotalQuantity() != null) {
             if (item.getItemDamagedTotalQuantity().isGreaterThan(item.getItemReceivedTotalQuantity())) {
                 GlobalVariables.getMessageMap().putError(PurapConstants.ITEM_TAB_ERROR_PROPERTY, PurapKeyConstants.ERROR_RECEIVING_LINE_QTYDAMAGED_GT_QTYRECEIVED, (lineNumber.intValue() == 0 ? "Add Line" : lineNumber.toString()));
                 return false;
             }
         }
         return true;
     }
 
     protected boolean validateAllReceivingLinesHaveSaneQuantities(ReceivingDocument document) {
         GlobalVariables.getMessageMap().clearErrorPath();
         boolean valid = true;
         for (int i = 0; i < document.getItems().size(); i++) {
             LineItemReceivingItem item = (LineItemReceivingItem) document.getItems().get(i);
 
             valid &= validateQuantityReturnedNotMoreThanReceived(document, item, "", new Integer(i + 1));
             valid &= validateQuantityDamagedNotMoreThanReceived(document, item, "", new Integer(i + 1));
         }
         return valid;
     }
 
 }