/*
    * Prometheus: Application Framework
    * 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.prometheus.maps;
  
  import io.github.tonywasher.joceanus.oceanus.format.OceanusDataFormatter;
  import io.github.tonywasher.joceanus.metis.field.MetisFieldItem;
  import io.github.tonywasher.joceanus.metis.field.MetisFieldSet;
  import io.github.tonywasher.joceanus.prometheus.data.PrometheusDataItem;
  import io.github.tonywasher.joceanus.prometheus.maps.PrometheusMapsInstanceElement.PrometheusMapsInstanceElementItem;
  import io.github.tonywasher.joceanus.prometheus.maps.PrometheusMapsInstanceElement.PrometheusMapsInstanceElementList;
  
  import java.util.LinkedHashMap;
  import java.util.Map;
  
  /**
   * InstanceMaps Base.
   */
  public abstract class PrometheusMapsBaseInstance
          implements MetisFieldItem {
      /**
       * Report fields.
       */
      private static final MetisFieldSet<PrometheusMapsBaseInstance> FIELD_DEFS
              = MetisFieldSet.newFieldSet(PrometheusMapsBaseInstance.class);
  
      /*
       * Declare Fields.
       */
      static {
          FIELD_DEFS.declareLocalField(PrometheusMapsResource.MAPS_INSTANCEMAP, PrometheusMapsBaseInstance::getMap);
      }
  
      /**
       * The map.
       */
      private final Map<Object, PrometheusMapsInstanceElement> theMap;
  
      /**
       * Constructor.
       */
      PrometheusMapsBaseInstance() {
          theMap = new LinkedHashMap<>();
      }
  
      @Override
      public MetisFieldSetDef getDataFieldSet() {
          return FIELD_DEFS;
      }
  
      @Override
      public String formatObject(final OceanusDataFormatter pFormatter) {
          return PrometheusMapsBaseInstance.class.getSimpleName();
      }
  
      /**
       * Obtain the map.
       *
       * @return the map
       */
      private Map<Object, PrometheusMapsInstanceElement> getMap() {
          return theMap;
      }
  
      /**
       * add item to map.
       *
       * @param pKey  the key for the item
       * @param pItem the item
       */
      void addItemToMap(final Object pKey,
                        final PrometheusDataItem pItem) {
          final PrometheusMapsInstanceElement myCurr = theMap.get(pKey);
          if (myCurr != null) {
              theMap.put(pKey, new PrometheusMapsInstanceElementList(myCurr, pItem));
          } else {
              theMap.put(pKey, new PrometheusMapsInstanceElementItem(pItem));
          }
      }
  
      /**
       * Is the key duplicate?
       *
       * @param pKey the key
       * @return true/false
       */
     boolean isKeyDuplicate(final Object pKey) {
         return theMap.get(pKey) instanceof PrometheusMapsInstanceElementList;
     }
 
     /**
      * Is the key available?
      *
      * @param pKey the key
      * @return true/false
      */
     boolean isKeyAvailable(final Object pKey) {
         return theMap.get(pKey) == null;
     }
 
     /**
      * Obtain the item for the key.
      *
      * @param pKey the key
      * @return the item
      */
     PrometheusDataItem getItemForKey(final Object pKey) {
         final PrometheusMapsInstanceElement myElement = theMap.get(pKey);
         if (myElement instanceof PrometheusMapsInstanceElementItem myItem) {
             return myItem.getItem();
         }
         if (myElement instanceof PrometheusMapsInstanceElementList) {
             return myElement.getList().get(0);
         }
         return null;
     }
 
     /**
      * Reset Maps.
      */
     void resetMap() {
         theMap.clear();
     }
 }