/*
    * MoneyWise: Finance Application
    * Copyright 2012-2026. Tony Washer
    *
    * 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 io.github.tonywasher.joceanus.moneywise.tax.uk;
  
  import io.github.tonywasher.joceanus.oceanus.decimal.OceanusMoney;
  import io.github.tonywasher.joceanus.oceanus.format.OceanusDataFormatter;
  import io.github.tonywasher.joceanus.metis.field.MetisFieldSet;
  import io.github.tonywasher.joceanus.moneywise.tax.MoneyWiseMarginalReduction;
  import io.github.tonywasher.joceanus.moneywise.tax.MoneyWiseTaxBandSet.MoneyWiseTaxBand;
  import io.github.tonywasher.joceanus.moneywise.tax.MoneyWiseTaxResource;
  
  import java.util.Iterator;
  
  /**
   * Savings UK Tax Allowance.
   */
  public class MoneyWiseUKSavingsAllowance
          extends MoneyWiseUKBasicAllowance {
      /**
       * Local Report fields.
       */
      private static final MetisFieldSet<MoneyWiseUKSavingsAllowance> FIELD_DEFS = MetisFieldSet.newFieldSet(MoneyWiseUKSavingsAllowance.class);
  
      /*
       * Declare Fields.
       */
      static {
          FIELD_DEFS.declareLocalField(MoneyWiseTaxResource.ALLOWANCE_SAVINGS, MoneyWiseUKSavingsAllowance::getSavingsAllowance);
          FIELD_DEFS.declareLocalField(MoneyWiseTaxResource.ALLOWANCE_DIVIDEND, MoneyWiseUKSavingsAllowance::getDividendAllowance);
          FIELD_DEFS.declareLocalField(MoneyWiseTaxResource.LIMIT_ADDALLOWANCE, MoneyWiseUKSavingsAllowance::getAdditionalAllowanceLimit);
      }
  
      /**
       * SavingsAllowance.
       */
      private final OceanusMoney theSavingsAllowance;
  
      /**
       * DividendAllowance.
       */
      private final OceanusMoney theDividendAllowance;
  
      /**
       * AdditionalAllowanceLimit.
       */
      private final OceanusMoney theAddAllowLimit;
  
      /**
       * Constructor.
       *
       * @param pAllowance         the allowance
       * @param pRentalAllowance   the rental allowance
       * @param pCapitalAllowance  the capital allowance
       * @param pSavingsAllowance  the savings allowance
       * @param pDividendAllowance the dividend allowance
       * @param pAddAllowLimit     the additional allowance limit
       */
      protected MoneyWiseUKSavingsAllowance(final OceanusMoney pAllowance,
                                            final OceanusMoney pRentalAllowance,
                                            final OceanusMoney pCapitalAllowance,
                                            final OceanusMoney pSavingsAllowance,
                                            final OceanusMoney pDividendAllowance,
                                            final OceanusMoney pAddAllowLimit) {
          super(pAllowance, pRentalAllowance, pCapitalAllowance, MoneyWiseMarginalReduction.ONEINTWO);
          theSavingsAllowance = pSavingsAllowance;
          theDividendAllowance = pDividendAllowance;
          theAddAllowLimit = pAddAllowLimit;
      }
  
      /**
       * Obtain the savings allowance.
       *
       * @return the Allowance
       */
      protected OceanusMoney getSavingsAllowance() {
          return theSavingsAllowance;
      }
  
      /**
       * Obtain the dividend allowance.
       *
       * @return the Allowance
       */
      protected OceanusMoney getDividendAllowance() {
          return theDividendAllowance;
     }
 
     /**
      * Obtain the additional Allowance limit.
      *
      * @return the Limit
      */
     protected OceanusMoney getAdditionalAllowanceLimit() {
         return theAddAllowLimit;
     }
 
     @Override
     protected OceanusMoney calculateBasicAllowance(final MoneyWiseUKTaxConfig pConfig) {
         /* Determine Basic allowance */
         OceanusMoney myAllowance = getAllowance();
 
         /* If we have additional tax possible and we are above the allowance limit */
         final OceanusMoney myGross = pConfig.getGrossTaxable();
         if (myGross.compareTo(theAddAllowLimit) > 0) {
             /* Calculate and apply the reduction */
             final OceanusMoney myReduction = getMarginalReduction().calculateReduction(myGross, theAddAllowLimit);
             myAllowance = new OceanusMoney(myAllowance);
             myAllowance.subtractAmount(myReduction);
 
             /* If we have reduced below zero */
             if (!myAllowance.isPositive()) {
                 /* Set the allowance to zero */
                 myAllowance.setZero();
             }
         }
 
         /* Return the allowance */
         return myAllowance;
     }
 
     @Override
     protected OceanusMoney calculateSavingsAllowance(final MoneyWiseUKTaxConfig pConfig) {
         /* Obtain the gross taxable and allowance */
         final OceanusMoney myGross = pConfig.getGrossTaxable();
         final OceanusMoney myBoundary = new OceanusMoney(pConfig.getAllowance());
 
         /* Obtain the tax bands */
         final MoneyWiseUKTaxBands myBands = pConfig.getTaxYear().getTaxBands();
         final Iterator<MoneyWiseTaxBand> myIterator = myBands.getStandardSet().iterator();
 
         /* If we have a basic band */
         if (myIterator.hasNext()) {
             /* If we are only a basic taxPayer return the full allowance */
             myBoundary.addAmount(myIterator.next().getAmount());
             if (myBoundary.compareTo(myGross) >= 0) {
                 return theSavingsAllowance;
             }
         }
 
         /* If we have a high band */
         final OceanusMoney myAllowance = new OceanusMoney(theSavingsAllowance);
         if (myIterator.hasNext()) {
             /* If we are only a high taxPayer return the half allowance */
             myBoundary.addAmount(myIterator.next().getAmount());
             if (myBoundary.compareTo(myGross) >= 0) {
                 myAllowance.divide(2);
                 return myAllowance;
             }
         }
 
         /* No Allowance */
         myAllowance.setZero();
         return theSavingsAllowance;
     }
 
     @Override
     protected OceanusMoney calculateDividendAllowance() {
         return theDividendAllowance;
     }
 
     @Override
     public MetisFieldSet<MoneyWiseUKSavingsAllowance> getDataFieldSet() {
         return FIELD_DEFS;
     }
 
     @Override
     public String formatObject(final OceanusDataFormatter pFormatter) {
         return FIELD_DEFS.getName();
     }
 }