/*
    * 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.data.basic;
  
  import io.github.tonywasher.joceanus.oceanus.base.OceanusException;
  import io.github.tonywasher.joceanus.oceanus.date.OceanusDate;
  import io.github.tonywasher.joceanus.oceanus.date.OceanusDateFormatter;
  import io.github.tonywasher.joceanus.oceanus.date.OceanusDateRange;
  import io.github.tonywasher.joceanus.oceanus.decimal.OceanusMoney;
  import io.github.tonywasher.joceanus.oceanus.decimal.OceanusRatio;
  import io.github.tonywasher.joceanus.oceanus.format.OceanusDataFormatter;
  import io.github.tonywasher.joceanus.metis.data.MetisDataDifference;
  import io.github.tonywasher.joceanus.metis.data.MetisDataItem.MetisDataFieldId;
  import io.github.tonywasher.joceanus.metis.data.MetisDataItem.MetisDataList;
  import io.github.tonywasher.joceanus.metis.data.MetisDataResource;
  import io.github.tonywasher.joceanus.metis.field.MetisFieldItem;
  import io.github.tonywasher.joceanus.metis.field.MetisFieldSet;
  import io.github.tonywasher.joceanus.metis.field.MetisFieldVersionedSet;
  import io.github.tonywasher.joceanus.moneywise.data.statics.MoneyWiseCurrency;
  import io.github.tonywasher.joceanus.moneywise.data.statics.MoneyWiseCurrency.MoneyWiseCurrencyList;
  import io.github.tonywasher.joceanus.moneywise.data.statics.MoneyWiseStaticResource;
  import io.github.tonywasher.joceanus.moneywise.exc.MoneyWiseDataException;
  import io.github.tonywasher.joceanus.prometheus.data.PrometheusDataInstanceMap;
  import io.github.tonywasher.joceanus.prometheus.data.PrometheusDataItem;
  import io.github.tonywasher.joceanus.prometheus.data.PrometheusDataList;
  import io.github.tonywasher.joceanus.prometheus.data.PrometheusDataMapItem;
  import io.github.tonywasher.joceanus.prometheus.data.PrometheusDataValues;
  
  import java.util.ArrayList;
  import java.util.Currency;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.List;
  import java.util.ListIterator;
  import java.util.Map;
  
  /**
   * ExchangeRate class.
   */
  public class MoneyWiseExchangeRate
          extends PrometheusDataItem {
      /**
       * Object name.
       */
      public static final String OBJECT_NAME = MoneyWiseBasicDataType.EXCHANGERATE.getItemName();
  
      /**
       * List name.
       */
      public static final String LIST_NAME = MoneyWiseBasicDataType.EXCHANGERATE.getListName();
  
      /**
       * Local Report fields.
       */
      private static final MetisFieldVersionedSet<MoneyWiseExchangeRate> FIELD_DEFS = MetisFieldVersionedSet.newVersionedFieldSet(MoneyWiseExchangeRate.class);
  
      /*
       * FieldIds.
       */
      static {
          FIELD_DEFS.declareDateField(MoneyWiseBasicResource.MONEYWISEDATA_FIELD_DATE);
          FIELD_DEFS.declareLinkField(MoneyWiseBasicResource.XCHGRATE_FROM);
          FIELD_DEFS.declareLinkField(MoneyWiseBasicResource.XCHGRATE_TO);
          FIELD_DEFS.declareRatioField(MoneyWiseBasicResource.XCHGRATE_RATE);
      }
  
      /**
       * Circular Rate Error.
       */
      public static final String ERROR_CIRCLE = MoneyWiseBasicResource.XCHGRATE_ERROR_CIRCLE.getValue();
  
      /**
       * Default Rate Error.
       */
      public static final String ERROR_DEF = MoneyWiseBasicResource.XCHGRATE_ERROR_DEFAULT.getValue();
  
      /**
       * Copy Constructor.
       *
       * @param pList the list
       * @param pRate The Rate to copy
       */
      protected MoneyWiseExchangeRate(final MoneyWiseExchangeRateBaseList<? extends MoneyWiseExchangeRate> pList,
                                      final MoneyWiseExchangeRate pRate) {
          /* Set standard values */
         super(pList, pRate);
     }
 
     /**
      * Edit Constructor.
      *
      * @param pList the list
      */
     public MoneyWiseExchangeRate(final MoneyWiseExchangeRateBaseList<? extends MoneyWiseExchangeRate> pList) {
         super(pList, 0);
     }
 
     /**
      * Values constructor.
      *
      * @param pList   the List to add to
      * @param pValues the values constructor
      * @throws OceanusException on error
      */
     private MoneyWiseExchangeRate(final MoneyWiseExchangeRateList pList,
                                   final PrometheusDataValues pValues) throws OceanusException {
         /* Initialise the item */
         super(pList, pValues);
 
         /* Access formatter */
         final OceanusDataFormatter myFormatter = getDataSet().getDataFormatter();
 
         /* Protect against exceptions */
         try {
             /* Store the Date */
             Object myValue = pValues.getValue(MoneyWiseBasicResource.MONEYWISEDATA_FIELD_DATE);
             if (myValue instanceof OceanusDate d) {
                 setValueDate(d);
             } else if (myValue instanceof String s) {
                 final OceanusDateFormatter myParser = myFormatter.getDateFormatter();
                 setValueDate(myParser.parseDate(s));
             }
 
             /* Store the From currency */
             myValue = pValues.getValue(MoneyWiseBasicResource.XCHGRATE_FROM);
             if (myValue instanceof Integer i) {
                 setValueFromCurrency(i);
             } else if (myValue instanceof String s) {
                 setValueFromCurrency(s);
             }
 
             /* Store the To currency */
             myValue = pValues.getValue(MoneyWiseBasicResource.XCHGRATE_TO);
             if (myValue instanceof Integer i) {
                 setValueToCurrency(i);
             } else if (myValue instanceof String s) {
                 setValueToCurrency(s);
             }
 
             /* Store the Rate */
             myValue = pValues.getValue(MoneyWiseBasicResource.XCHGRATE_RATE);
             if (myValue instanceof OceanusRatio r) {
                 setValueExchangeRate(r);
             } else if (myValue instanceof String myString) {
                 setValueExchangeRate(myString);
                 setValueExchangeRate(myFormatter.parseValue(myString, OceanusRatio.class));
             }
 
             /* Catch Exceptions */
         } catch (IllegalArgumentException e) {
             /* Pass on exception */
             throw new MoneyWiseDataException(this, ERROR_CREATEITEM, e);
         }
     }
 
     /**
      * Edit Constructor.
      *
      * @param pList the list
      */
     public MoneyWiseExchangeRate(final MoneyWiseExchangeRateList pList) {
         super(pList, 0);
     }
 
     @Override
     public MetisFieldSetDef getDataFieldSet() {
         return FIELD_DEFS;
     }
 
     @Override
     public String formatObject(final OceanusDataFormatter pFormatter) {
         return toString();
     }
 
     @Override
     public String toString() {
         /* Access formatter */
         final OceanusDataFormatter myFormatter = getDataSet().getDataFormatter();
 
         /* Create string builder */
         final StringBuilder myBuilder = new StringBuilder();
         myBuilder.append(myFormatter.formatObject(getDate()));
         myBuilder.append(" ");
         myBuilder.append(myFormatter.formatObject(getFromCurrency().getCurrency().getCurrencyCode()));
         myBuilder.append(": ");
         myBuilder.append(myFormatter.formatObject(getToCurrency().getCurrency().getCurrencyCode()));
         myBuilder.append('=');
         myBuilder.append(myFormatter.formatObject(getExchangeRate()));
         return myBuilder.toString();
     }
 
     @Override
     public boolean includeXmlField(final MetisDataFieldId pField) {
         /* Determine whether fields should be included */
         if (MoneyWiseBasicResource.MONEYWISEDATA_FIELD_DATE.equals(pField)) {
             return true;
         }
         if (MoneyWiseBasicResource.XCHGRATE_FROM.equals(pField)) {
             return true;
         }
         if (MoneyWiseBasicResource.XCHGRATE_TO.equals(pField)) {
             return true;
         }
         if (MoneyWiseBasicResource.XCHGRATE_RATE.equals(pField)) {
             return true;
         }
 
         /* Pass call on */
         return super.includeXmlField(pField);
     }
 
     /**
      * Obtain Date.
      *
      * @return the name
      */
     public OceanusDate getDate() {
         return getValues().getValue(MoneyWiseBasicResource.MONEYWISEDATA_FIELD_DATE, OceanusDate.class);
     }
 
     /**
      * Obtain From currency.
      *
      * @return the currency
      */
     public MoneyWiseCurrency getFromCurrency() {
         return getValues().getValue(MoneyWiseBasicResource.XCHGRATE_FROM, MoneyWiseCurrency.class);
     }
 
     /**
      * Obtain fromCurrencyId.
      *
      * @return the fromCurrencyId
      */
     public Integer getFromCurrencyId() {
         final MoneyWiseCurrency myCurr = getFromCurrency();
         return myCurr == null
                 ? null
                 : myCurr.getIndexedId();
     }
 
     /**
      * Obtain FromCurrencyName.
      *
      * @return the fromCurrencyName
      */
     public String getFromCurrencyName() {
         final MoneyWiseCurrency myCurr = getFromCurrency();
         return myCurr == null
                 ? null
                 : myCurr.getName();
     }
 
     /**
      * Obtain To currency.
      *
      * @return the currency
      */
     public MoneyWiseCurrency getToCurrency() {
         return getValues().getValue(MoneyWiseBasicResource.XCHGRATE_TO, MoneyWiseCurrency.class);
     }
 
     /**
      * Obtain toCurrencyId.
      *
      * @return the toCurrencyId
      */
     public Integer getToCurrencyId() {
         final MoneyWiseCurrency myCurr = getToCurrency();
         return myCurr == null
                 ? null
                 : myCurr.getIndexedId();
     }
 
     /**
      * Obtain ToCurrencyName.
      *
      * @return the toCurrencyName
      */
     public String getToCurrencyName() {
         final MoneyWiseCurrency myCurr = getToCurrency();
         return myCurr == null
                 ? null
                 : myCurr.getName();
     }
 
     /**
      * Obtain ExchangeRate.
      *
      * @return the rate
      */
     public OceanusRatio getExchangeRate() {
         return getValues().getValue(MoneyWiseBasicResource.XCHGRATE_RATE, OceanusRatio.class);
     }
 
     /**
      * Obtain InverseRate.
      *
      * @return the inverse rate
      */
     public OceanusRatio getInverseRate() {
         final OceanusRatio myRate = getExchangeRate();
         return myRate == null
                 ? null
                 : myRate.getInverseRatio();
     }
 
     /**
      * Set date value.
      *
      * @param pValue the value
      */
     private void setValueDate(final OceanusDate pValue) {
         getValues().setUncheckedValue(MoneyWiseBasicResource.MONEYWISEDATA_FIELD_DATE, pValue);
     }
 
     /**
      * Set from currency value.
      *
      * @param pValue the value
      */
     private void setValueFromCurrency(final MoneyWiseCurrency pValue) {
         getValues().setUncheckedValue(MoneyWiseBasicResource.XCHGRATE_FROM, pValue);
     }
 
     /**
      * Set from currency value.
      *
      * @param pValue the value
      */
     private void setValueFromCurrency(final Integer pValue) {
         getValues().setUncheckedValue(MoneyWiseBasicResource.XCHGRATE_FROM, pValue);
     }
 
     /**
      * Set from currency value.
      *
      * @param pValue the value
      */
     private void setValueFromCurrency(final String pValue) {
         getValues().setUncheckedValue(MoneyWiseBasicResource.XCHGRATE_FROM, pValue);
     }
 
     /**
      * Set to currency value.
      *
      * @param pValue the value
      */
     private void setValueToCurrency(final MoneyWiseCurrency pValue) {
         getValues().setUncheckedValue(MoneyWiseBasicResource.XCHGRATE_TO, pValue);
     }
 
     /**
      * Set to currency value.
      *
      * @param pValue the value
      */
     private void setValueToCurrency(final Integer pValue) {
         getValues().setUncheckedValue(MoneyWiseBasicResource.XCHGRATE_TO, pValue);
     }
 
     /**
      * Set to currency value.
      *
      * @param pValue the value
      */
     private void setValueToCurrency(final String pValue) {
         getValues().setUncheckedValue(MoneyWiseBasicResource.XCHGRATE_TO, pValue);
     }
 
     /**
      * Set exchange rate value.
      *
      * @param pValue the value
      */
     protected void setValueExchangeRate(final OceanusRatio pValue) {
         getValues().setUncheckedValue(MoneyWiseBasicResource.XCHGRATE_RATE, pValue);
     }
 
     /**
      * Set exchange rate value.
      *
      * @param pValue the value
      */
     private void setValueExchangeRate(final String pValue) {
         getValues().setUncheckedValue(MoneyWiseBasicResource.XCHGRATE_RATE, pValue);
     }
 
     @Override
     public MoneyWiseDataSet getDataSet() {
         return (MoneyWiseDataSet) super.getDataSet();
     }
 
     @Override
     public MoneyWiseExchangeRate getBase() {
         return (MoneyWiseExchangeRate) super.getBase();
     }
 
     @Override
     @SuppressWarnings("unchecked")
     public MoneyWiseExchangeRateBaseList<? extends MoneyWiseExchangeRate> getList() {
         return (MoneyWiseExchangeRateBaseList<? extends MoneyWiseExchangeRate>) super.getList();
     }
 
     @Override
     public int compareValues(final PrometheusDataItem pThat) {
         /* Access as ExchangeRate */
         final MoneyWiseExchangeRate myThat = (MoneyWiseExchangeRate) pThat;
 
         /* If the date differs */
         int iDiff = MetisDataDifference.compareObject(getDate(), myThat.getDate());
         if (iDiff != 0) {
             /* Sort in reverse date order !! */
             return -iDiff;
         }
 
         /* Compare From Currency */
         iDiff = MetisDataDifference.compareObject(getFromCurrency(), myThat.getFromCurrency());
         if (iDiff != 0) {
             return iDiff;
         }
 
         /* Compare the toCurrency */
         return getToCurrency().compareTo(myThat.getToCurrency());
     }
 
     @Override
     public void resolveDataSetLinks() throws OceanusException {
         /* Update the Encryption details */
         super.resolveDataSetLinks();
 
         /* Resolve currencies */
         final MoneyWiseDataSet myData = getDataSet();
         final MoneyWiseCurrencyList myCurrencies = myData.getAccountCurrencies();
         resolveDataLink(MoneyWiseBasicResource.XCHGRATE_FROM, myCurrencies);
         resolveDataLink(MoneyWiseBasicResource.XCHGRATE_TO, myCurrencies);
     }
 
     /**
      * Set a new date.
      *
      * @param pDate the new date
      */
     public void setDate(final OceanusDate pDate) {
         setValueDate(pDate);
     }
 
     /**
      * Set a new from currency.
      *
      * @param pCurrency the new from currency
      */
     public void setFromCurrency(final MoneyWiseCurrency pCurrency) {
         setValueFromCurrency(pCurrency);
     }
 
     /**
      * Set a new to currency.
      *
      * @param pCurrency the new to currency
      */
     public void setToCurrency(final MoneyWiseCurrency pCurrency) {
         setValueToCurrency(pCurrency);
     }
 
     /**
      * Set a new exchange rate.
      *
      * @param pRate the new rate
      */
     public void setExchangeRate(final OceanusRatio pRate) {
         setValueExchangeRate(pRate);
     }
 
     @Override
     public void touchUnderlyingItems() {
         /* touch the currencies referred to */
         getFromCurrency().touchItem(this);
         getToCurrency().touchItem(this);
     }
 
     /**
      * Update base rate from an edited rate.
      *
      * @param pRate the edited rate
      * @return whether changes have been made
      */
     @Override
     public boolean applyChanges(final PrometheusDataItem pRate) {
         /* Can only update from an event exchange rate */
         if (!(pRate instanceof MoneyWiseExchangeRate)) {
             return false;
         }
         final MoneyWiseExchangeRate myRate = (MoneyWiseExchangeRate) pRate;
 
         /* Store the current detail into history */
         pushHistory();
 
         /* Update the Date if required */
         if (!MetisDataDifference.isEqual(getDate(), myRate.getDate())) {
             setValueDate(myRate.getDate());
         }
 
         /* Update the from currency if required */
         if (!MetisDataDifference.isEqual(getFromCurrency(), myRate.getFromCurrency())) {
             setValueFromCurrency(myRate.getFromCurrency());
         }
 
         /* Update the to currency if required */
         if (!MetisDataDifference.isEqual(getToCurrency(), myRate.getToCurrency())) {
             setValueToCurrency(myRate.getToCurrency());
         }
 
         /* Update the rate if required */
         if (!MetisDataDifference.isEqual(getExchangeRate(), myRate.getExchangeRate())) {
             setValueExchangeRate(myRate.getExchangeRate());
         }
 
         /* Check for changes */
         return checkForHistory();
     }
 
     @Override
     public void adjustMapForItem() {
         final MoneyWiseExchangeRateBaseList<? extends MoneyWiseExchangeRate> myList = getList();
         final MoneyWiseExchangeRateDataMap myMap = myList.getDataMap();
         myMap.adjustForItem(this);
     }
 
     /**
      * Price List.
      *
      * @param <T> the data type
      */
     public abstract static class MoneyWiseExchangeRateBaseList<T extends MoneyWiseExchangeRate>
             extends PrometheusDataList<T> {
         /*
          * Report fields.
          */
         static {
             MetisFieldSet.newFieldSet(MoneyWiseExchangeRateBaseList.class);
         }
 
         /**
          * Construct an empty CORE Price list.
          *
          * @param pData     the DataSet for the list
          * @param pClass    the class of the item
          * @param pItemType the item type
          */
         protected MoneyWiseExchangeRateBaseList(final MoneyWiseDataSet pData,
                                                 final Class<T> pClass,
                                                 final MoneyWiseBasicDataType pItemType) {
             /* Call super-constructor */
             super(pClass, pData, pItemType, PrometheusListStyle.CORE);
         }
 
         /**
          * Constructor for a cloned List.
          *
          * @param pSource the source List
          */
         protected MoneyWiseExchangeRateBaseList(final MoneyWiseExchangeRateBaseList<T> pSource) {
             /* Call super-constructor */
             super(pSource);
         }
 
         @Override
         public MoneyWiseExchangeRateDataMap getDataMap() {
             return (MoneyWiseExchangeRateDataMap) super.getDataMap();
         }
 
         @Override
         protected MoneyWiseExchangeRateDataMap allocateDataMap() {
             return new MoneyWiseExchangeRateDataMap();
         }
     }
 
     /**
      * The ExchangeRate List class.
      */
     public static class MoneyWiseExchangeRateList
             extends MoneyWiseExchangeRateBaseList<MoneyWiseExchangeRate> {
         /**
          * Report fields.
          */
         private static final MetisFieldSet<MoneyWiseExchangeRateList> FIELD_DEFS = MetisFieldSet.newFieldSet(MoneyWiseExchangeRateList.class);
 
         /*
          * Declare Fields.
          */
         static {
             FIELD_DEFS.declareLocalField(MoneyWiseStaticResource.CURRENCY_REPORTING, MoneyWiseExchangeRateList::getReportingCurrency);
         }
 
         /**
          * The reporting currency.
          */
         private MoneyWiseCurrency theReporting;
 
         /**
          * Construct an empty CORE ExchangeRate list.
          *
          * @param pData the DataSet for the list
          */
         protected MoneyWiseExchangeRateList(final MoneyWiseDataSet pData) {
             super(pData, MoneyWiseExchangeRate.class, MoneyWiseBasicDataType.EXCHANGERATE);
         }
 
         /**
          * Constructor for a cloned List.
          *
          * @param pSource the source List
          */
         protected MoneyWiseExchangeRateList(final MoneyWiseExchangeRateList pSource) {
             super(pSource);
         }
 
         @Override
         public MetisFieldSet<MoneyWiseExchangeRateList> getDataFieldSet() {
             return FIELD_DEFS;
         }
 
         /**
          * Obtain reporting currency.
          *
          * @return the reporting currency
          */
         public MoneyWiseCurrency getReportingCurrency() {
             return theReporting;
         }
 
         @Override
         public String listName() {
             return LIST_NAME;
         }
 
         @Override
         public MetisFieldSetDef getItemFields() {
             return MoneyWiseExchangeRate.FIELD_DEFS;
         }
 
         @Override
         public MoneyWiseDataSet getDataSet() {
             return (MoneyWiseDataSet) super.getDataSet();
         }
 
         @Override
         protected MoneyWiseExchangeRateList getEmptyList(final PrometheusListStyle pStyle) {
             final MoneyWiseExchangeRateList myList = new MoneyWiseExchangeRateList(this);
             myList.setStyle(pStyle);
             return myList;
         }
 
         /**
          * Add a new item to the core list.
          *
          * @param pRate item
          * @return the newly added item
          */
         @Override
         public MoneyWiseExchangeRate addCopyItem(final PrometheusDataItem pRate) {
             /* Can only clone an ExchangeRate */
             if (!(pRate instanceof MoneyWiseExchangeRate)) {
                 throw new UnsupportedOperationException();
             }
 
             final MoneyWiseExchangeRate myRate = new MoneyWiseExchangeRate(this, (MoneyWiseExchangeRate) pRate);
             add(myRate);
             return myRate;
         }
 
         /**
          * Add a new item to the edit list.
          *
          * @return the new item
          */
         @Override
         public MoneyWiseExchangeRate addNewItem() {
             final MoneyWiseExchangeRate myRate = new MoneyWiseExchangeRate(this);
             add(myRate);
             return myRate;
         }
 
         @Override
         public MoneyWiseExchangeRate addValuesItem(final PrometheusDataValues pValues)
                 throws OceanusException {
             /* Create the rate */
             final MoneyWiseExchangeRate myRate = new MoneyWiseExchangeRate(this, pValues);
 
             /* Check that this RateId has not been previously added */
             if (!isIdUnique(myRate.getIndexedId())) {
                 myRate.addError(ERROR_DUPLICATE, MetisDataResource.DATA_ID);
                 throw new MoneyWiseDataException(myRate, ERROR_VALIDATION);
             }
 
             /* Add to the list */
             add(myRate);
 
             /* Return it */
             return myRate;
         }
 
         /**
          * Convert a monetary value to the currency.
          *
          * @param pValue    the value to convert
          * @param pCurrency the required currency
          * @param pDate     the date of the conversion
          * @return the converted value
          */
         public OceanusMoney convertCurrency(final OceanusMoney pValue,
                                             final MoneyWiseCurrency pCurrency,
                                             final OceanusDate pDate) {
             /* Obtain the existing currency */
             OceanusMoney myValue = pValue;
             final MoneyWiseCurrencyList myCurrencies = getDataSet().getAccountCurrencies();
             final Currency myCurrent = pValue.getCurrency();
             final Currency myReporting = theReporting.getCurrency();
             final Currency myTarget = pCurrency.getCurrency();
 
             /* Handle no conversion required */
             if (myCurrent.equals(myTarget)) {
                 return pValue;
             }
 
             /* If the value is not already the reporting currency */
             if (!myCurrent.equals(myReporting)) {
                 /* Find the required exchange rate */
                 final OceanusRatio myRate = findRate(myCurrencies.findCurrency(myCurrent), pDate);
 
                 /* Convert the currency */
                 myValue = myValue.convertCurrency(myReporting, myRate);
             }
 
             /* If we need to convert to a non-default currency */
             if (!myReporting.equals(myTarget)) {
                 /* Find the required exchange rate */
                 final OceanusRatio myRate = findRate(pCurrency, pDate);
 
                 /* Convert the currency */
                 myValue = myValue.convertCurrency(myTarget, myRate);
             }
 
             /* Return the converted currency */
             return myValue;
         }
 
         /**
          * Find the exchange rate.
          *
          * @param pCurrency the currency to find
          * @param pDate     the date to find the exchange rate for
          * @return the exchange rate
          */
         private OceanusRatio findRate(final MoneyWiseCurrency pCurrency,
                                       final OceanusDate pDate) {
             /* pass call to data map */
             return getDataMap().getRateForDate(pCurrency, pDate);
         }
 
         /**
          * Set the default currency.
          *
          * @param pCurrency the new default currency
          */
         public void setReportingCurrency(final MoneyWiseCurrency pCurrency) {
             /* Access the iterator */
             final Iterator<MoneyWiseExchangeRate> myIterator = iterator();
             OceanusRatio myCurrRate = null;
             OceanusDate myCurrDate = null;
 
             /* Loop through the items to find the entry */
             while (myIterator.hasNext()) {
                 final MoneyWiseExchangeRate myCurr = myIterator.next();
 
                 /* Access details */
                 final OceanusDate myDate = myCurr.getDate();
                 final MoneyWiseCurrency myTo = myCurr.getToCurrency();
                 final OceanusRatio myRatio = myCurr.getExchangeRate();
 
                 /* If this is a new date */
                 if (myCurrDate == null || !myDate.equals(myCurrDate)) {
                     /* Access the current rate for the new default currency */
                     /*
                      * TODO This must exist on the same date or else the currency cannot be set as
                      * default
                      */
                     myCurrRate = findRate(pCurrency, myDate);
                     myCurrDate = myDate;
                 }
 
                 /* Update the item */
                 myCurr.pushHistory();
 
                 /* If this is a conversion to the new default */
                 if (myTo.equals(pCurrency)) {
                     /* Switch the direction of the currencies */
                     myCurr.setToCurrency(myCurr.getFromCurrency());
 
                     /* Invert the ratio */
                     myCurr.setExchangeRate(myRatio.getInverseRatio());
 
                     /* Else does not currently involve the new currency */
                 } else {
                     /* Need to combine the rates */
                     myCurr.setExchangeRate(new OceanusRatio(myRatio, myCurrRate));
                 }
 
                 /* Set from currency */
                 myCurr.setFromCurrency(pCurrency);
             }
 
             /* Set the new reporting currency */
             theReporting = pCurrency;
         }
     }
 
     /**
      * The dataMap class.
      */
     public static class MoneyWiseExchangeRateDataMap
             implements PrometheusDataMapItem, MetisFieldItem {
         /**
          * Report fields.
          */
         @SuppressWarnings("rawtypes")
         private static final MetisFieldSet<MoneyWiseExchangeRateDataMap> FIELD_DEFS = MetisFieldSet.newFieldSet(MoneyWiseExchangeRateDataMap.class);
 
         /*
          * UnderlyingMap Field Id.
          */
         static {
             FIELD_DEFS.declareLocalField(MoneyWiseBasicResource.MONEYWISEDATA_MAP_MAPOFMAPS, MoneyWiseExchangeRateDataMap::getMapOfMaps);
             FIELD_DEFS.declareLocalField(MoneyWiseBasicResource.XCHGRATE_MAP_MAPOFRATES, MoneyWiseExchangeRateDataMap::getMapOfRates);
         }
 
         /**
          * Map of Maps.
          */
         private final Map<MoneyWiseCurrency, Map<OceanusDate, Integer>> theMapOfMaps;
 
         /**
          * Map of Rates.
          */
         private final Map<MoneyWiseCurrency, MoneyWiseRateList> theMapOfRates;
 
         /**
          * Constructor.
          */
         public MoneyWiseExchangeRateDataMap() {
             /* Create the maps */
             theMapOfMaps = new HashMap<>();
             theMapOfRates = new HashMap<>();
         }
 
         @SuppressWarnings("rawtypes")
         @Override
         public MetisFieldSet<MoneyWiseExchangeRateDataMap> getDataFieldSet() {
             return FIELD_DEFS;
         }
 
         @Override
         public String formatObject(final OceanusDataFormatter pFormatter) {
             return FIELD_DEFS.getName();
         }
 
         /**
          * Obtain mapOfMaps.
          *
          * @return the map
          */
         private Map<MoneyWiseCurrency, Map<OceanusDate, Integer>> getMapOfMaps() {
             return theMapOfMaps;
         }
 
         /**
          * Obtain mapOfRates.
          *
          * @return the map
          */
         private Map<MoneyWiseCurrency, MoneyWiseRateList> getMapOfRates() {
             return theMapOfRates;
         }
 
         @Override
         public void resetMap() {
             theMapOfMaps.clear();
             theMapOfRates.clear();
         }
 
         @Override
         public void adjustForItem(final PrometheusDataItem pItem) {
             /* Access the Currency Id */
             final MoneyWiseExchangeRate myItem = (MoneyWiseExchangeRate) pItem;
             final MoneyWiseCurrency myCurrency = myItem.getToCurrency();
             if (myCurrency == null) {
                 return;
             }
 
             /* Access the map */
             final Map<OceanusDate, Integer> myMap = theMapOfMaps.computeIfAbsent(myCurrency, c -> new HashMap<>());
 
             /* Adjust rate count */
             final OceanusDate myDate = myItem.getDate();
             final Integer myCount = myMap.get(myDate);
             if (myCount == null) {
                 myMap.put(myDate, PrometheusDataInstanceMap.ONE);
             } else {
                 myMap.put(myDate, myCount + 1);
             }
 
             /* Access the list */
             final MoneyWiseRateList myList = theMapOfRates.computeIfAbsent(myCurrency, MoneyWiseRateList::new);
 
             /* Add element to the list */
             myList.add(myItem);
         }
 
         /**
          * Check validity of Rate.
          *
          * @param pItem the rate
          * @return true/false
          */
         public boolean validRateCount(final MoneyWiseExchangeRate pItem) {
             /* Access the Details */
             final MoneyWiseCurrency myCurrency = pItem.getToCurrency();
             final OceanusDate myDate = pItem.getDate();
 
             /* Access the map */
             final Map<OceanusDate, Integer> myMap = theMapOfMaps.get(myCurrency);
             if (myMap != null) {
                 final Integer myResult = myMap.get(myDate);
                 return PrometheusDataInstanceMap.ONE.equals(myResult);
             }
             return false;
         }
 
         /**
          * Check availability of date for a currency.
          *
          * @param pCurrency the currency
          * @param pDate     the key to look up
          * @return true/false
          */
         public boolean availableDate(final MoneyWiseCurrency pCurrency,
                                      final OceanusDate pDate) {
             /* Access the map */
             final Map<OceanusDate, Integer> myMap = theMapOfMaps.get(pCurrency);
             return myMap == null
                     || myMap.get(pDate) == null;
         }
 
         /**
          * Obtain rate for date.
          *
          * @param pCurrency the currency
          * @param pDate     the date
          * @return the latest rate for the date.
          */
         public OceanusRatio getRateForDate(final MoneyWiseCurrency pCurrency,
                                            final OceanusDate pDate) {
             /* Access list for currency */
             final MoneyWiseRateList myList = theMapOfRates.get(pCurrency);
             if (myList != null) {
                 /* Loop through the rates */
                 final Iterator<MoneyWiseExchangeRate> myIterator = myList.iterator();
                 while (myIterator.hasNext()) {
                     final MoneyWiseExchangeRate myCurr = myIterator.next();
 
                     /* Access the date */
                     final OceanusDate myDate = myCurr.getDate();
 
                     /* break loop if we have the correct record */
                     if (myDate.compareTo(pDate) >= 0) {
                         return myCurr.getExchangeRate();
                     }
                 }
             }
 
             /* return null */
             return null;
         }
 
         /**
          * Obtain rates for range.
          *
          * @param pCurrency the currency
          * @param pRange    the date range
          * @return the two deep array of rates for the range.
          */
         public OceanusRatio[] getRatesForRange(final MoneyWiseCurrency pCurrency,
                                                final OceanusDateRange pRange) {
             /* Set rate */
             OceanusRatio myFirst = OceanusRatio.ONE;
             OceanusRatio myLatest = OceanusRatio.ONE;
             final OceanusDate myStart = pRange.getStart();
 
             /* Access list for security */
             final MoneyWiseRateList myList = theMapOfRates.get(pCurrency);
             if (myList != null) {
                 /* Loop through the rates */
                 final ListIterator<MoneyWiseExchangeRate> myIterator = myList.listIterator(myList.size());
                 while (myIterator.hasPrevious()) {
                     final MoneyWiseExchangeRate myCurr = myIterator.previous();
 
                     /* Check for the range of the date */
                     final OceanusDate myDate = myCurr.getDate();
                     final int iComp = pRange.compareToDate(myDate);
 
                     /* If this is later than the range we are finished */
                     if (iComp < 0) {
                         break;
                     }
 
                     /* Record as best rate */
                     myLatest = myCurr.getExchangeRate();
 
                     /* Adjust first rate */
                     if (iComp > 0
                             || myDate.compareTo(myStart) == 0) {
                         myFirst = myLatest;
                     }
                 }
             }
 
             /* Return the rates */
             return new OceanusRatio[]
                     {myFirst, myLatest};
         }
 
         /**
          * Obtain rateList cursor.
          *
          * @param pCurrency the currency
          * @return the latest rate for the date.
          */
         public ListIterator<MoneyWiseExchangeRate> rateIterator(final MoneyWiseCurrency pCurrency) {
             /* Access list for currency */
             final MoneyWiseRateList myList = theMapOfRates.get(pCurrency);
             return myList != null
                     ? myList.listIterator(myList.size())
                     : null;
         }
 
         /**
          * Rate List class.
          */
         private static final class MoneyWiseRateList
                 implements MetisFieldItem, MetisDataList<MoneyWiseExchangeRate> {
             /**
              * Report fields.
              */
             private static final MetisFieldSet<MoneyWiseRateList> FIELD_DEFS = MetisFieldSet.newFieldSet(MoneyWiseRateList.class);
 
             /*
              * UnderlyingMap Field Id.
              */
             static {
                 FIELD_DEFS.declareLocalField(MetisDataResource.LIST_SIZE, MoneyWiseRateList::size);
             }
 
             /**
              * The list.
              */
             private final List<MoneyWiseExchangeRate> theList;
 
             /**
              * The currency.
              */
             private final MoneyWiseCurrency theCurrency;
 
             /**
              * Constructor.
              *
              * @param pCurrency the currency
              */
             private MoneyWiseRateList(final MoneyWiseCurrency pCurrency) {
                 theCurrency = pCurrency;
                 theList = new ArrayList<>();
             }
 
             @Override
             public MetisFieldSet<MoneyWiseRateList> getDataFieldSet() {
                 return FIELD_DEFS;
             }
 
             @Override
             public String formatObject(final OceanusDataFormatter pFormatter) {
                 return theCurrency.formatObject(pFormatter)
                         + "("
                         + size()
                         + ")";
             }
 
             @Override
             public String toString() {
                 return theCurrency.toString()
                         + "("
                         + size()
                         + ")";
             }
 
             @Override
             public List<MoneyWiseExchangeRate> getUnderlyingList() {
                 return theList;
             }
         }
     }
 }