/*
 * The Kuali Financial System, a comprehensive financial management system for higher education.
 * 
 * Copyright 2005-2014 The Kuali Foundation
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.kuali.kfs.module.purap.document.validation.impl;

import java.math.BigDecimal;

import org.kuali.kfs.module.purap.PurapConstants;
import org.kuali.kfs.module.purap.PurapKeyConstants;
import org.kuali.kfs.module.purap.businessobject.PurApAccountingLine;
import org.kuali.kfs.module.purap.businessobject.PurApItem;
import org.kuali.kfs.module.purap.document.validation.PurchasingAccountsPayableItemPreCalculationRule;
import org.kuali.rice.kns.rules.DocumentRuleBase;
import org.kuali.rice.krad.util.GlobalVariables;

public class PurchasingAccountsPayablesItemPreCalculateDocumentRule extends DocumentRuleBase implements PurchasingAccountsPayableItemPreCalculationRule {
    
    public boolean checkPercentOrTotalAmountsEqual(PurApItem item) {
        boolean valid = true;
        
        valid &= validatePercent(item);
        
        if (valid) {
            valid &= validateTotalAmount(item);
        }
        
        return valid;
    }
    
    /** 
     * Verifies account percent. If the total percent does not equal 100, the validation fails. 
     */
    public boolean validatePercent(PurApItem item) {
        boolean valid = true;
        
        // validate that the percents total 100 for each item
        BigDecimal totalPercent = BigDecimal.ZERO;
        BigDecimal desiredPercent = new BigDecimal("100");
        for (PurApAccountingLine account : item.getSourceAccountingLines()) {
            if (account.getAccountLinePercent() != null) {
                totalPercent = totalPercent.add(account.getAccountLinePercent());
            }
            else {
                totalPercent = totalPercent.add(BigDecimal.ZERO);
            }
        }
        if (desiredPercent.compareTo(totalPercent) != 0) {
            GlobalVariables.getMessageMap().putError(PurapConstants.ITEM_TAB_ERROR_PROPERTY, PurapKeyConstants.ERROR_ITEM_ACCOUNTING_TOTAL, item.getItemIdentifierString());
            valid = false;
        }

        return valid;
    }
    
    /** 
     * Verifies account total. If the total does not equal item total,
     *  the validation fails. 
     */
    public boolean validateTotalAmount(PurApItem item) {
        boolean valid = true;
        
     // validate that the amount total 
        BigDecimal totalAmount = BigDecimal.ZERO;
        BigDecimal desiredAmount = 
            (item.getTotalAmount() == null) ? new BigDecimal(0) : item.getTotalAmount().bigDecimalValue();
        for (PurApAccountingLine account : item.getSourceAccountingLines()) {
            if (account.getAmount() != null) {
                totalAmount = totalAmount.add(account.getAmount().bigDecimalValue());
            }
            else {
                totalAmount = totalAmount.add(BigDecimal.ZERO);
            }
        }
        if (desiredAmount.compareTo(totalAmount) != 0) {
            GlobalVariables.getMessageMap().putError(PurapConstants.ITEM_TAB_ERROR_PROPERTY, PurapKeyConstants.ERROR_ITEM_ACCOUNTING_TOTAL_AMOUNT, item.getItemIdentifierString(),desiredAmount.toString());
            valid = false;
        }

        return valid;
    }
}