/*
    * This file is part of ***  M y C o R e  ***
    * See http://www.mycore.de/ for details.
    *
    * MyCoRe is free software: you can redistribute it and/or modify
    * it under the terms of the GNU General Public License as published by
    * the Free Software Foundation, either version 3 of the License, or
    * (at your option) any later version.
    *
   * MyCoRe 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 General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with MyCoRe.  If not, see <http://www.gnu.org/licenses/>.
   */
  
  package org.mycore.iiif.presentation.impl;
  
  import java.lang.reflect.Constructor;
  import java.lang.reflect.InvocationTargetException;
  import java.util.HashMap;
  import java.util.Map;
  
  import org.mycore.common.MCRException;
  import org.mycore.common.config.MCRConfiguration2;
  import org.mycore.common.config.MCRConfigurationException;
  import org.mycore.iiif.presentation.model.basic.MCRIIIFManifest;
  
  public abstract class MCRIIIFPresentationImpl {
  
      private static final String MCR_IIIF_PRESENTATION_CONFIG_PREFIX = "MCR.IIIFPresentation.";
  
      private static final Map<String, MCRIIIFPresentationImpl> IMPLHOLDER = new HashMap<>();
  
      private final String implName;
  
      public MCRIIIFPresentationImpl(final String implName) {
          this.implName = implName;
      }
  
      public static synchronized MCRIIIFPresentationImpl getInstance(String implNameParameter) {
          String implName = (implNameParameter == null || implNameParameter.isBlank())
              ? MCRConfiguration2.getStringOrThrow("MCR.IIIFPresentation.Default")
              : implNameParameter;
  
          if (IMPLHOLDER.containsKey(implName)) {
              return IMPLHOLDER.get(implName);
          }
  
          String classPropertyName = MCR_IIIF_PRESENTATION_CONFIG_PREFIX + implName;
          Class<? extends MCRIIIFPresentationImpl> classObject = MCRConfiguration2.<MCRIIIFPresentationImpl>getClass(
              classPropertyName)
              .orElseThrow(() -> MCRConfiguration2.createConfigurationException(classPropertyName));
  
          try {
              Constructor<? extends MCRIIIFPresentationImpl> constructor = classObject.getConstructor(String.class);
              MCRIIIFPresentationImpl presentationImpl = constructor.newInstance(implName);
              IMPLHOLDER.put(implName, presentationImpl);
              return presentationImpl;
          } catch (NoSuchMethodException e) {
              throw new MCRConfigurationException(
                  "Configurated class (" + classObject.getName() + ") needs a string constructor: " + classPropertyName);
          } catch (IllegalAccessException | InstantiationException | InvocationTargetException e) {
              throw new MCRException(e);
          }
      }
  
      public String getImplName() {
          return implName;
      }
  
      protected final Map<String, String> getProperties() {
          return MCRConfiguration2.getSubPropertiesMap(getConfigPrefix());
      }
  
      private String getConfigPrefix() {
          return MCR_IIIF_PRESENTATION_CONFIG_PREFIX + implName + ".";
      }
  
      /**
       * For consistency and security reasons it may become necessary to
       * to cleanup the identifier, which is an otherwise unchecked URL path parameter.
       * 
       * Subclasses may override.
       * 
       * @param identifier - the IIIF manifest identifier, which should be normalized
       * @return the normalized identifier
       */
      public String normalizeIdentifier(String identifier) {
          return identifier;
      }
  
      public abstract MCRIIIFManifest getManifest(String id);
  
  }