/*
    * SPDX-FileCopyrightText: none
    * SPDX-License-Identifier: CC0-1.0
    */
   
   package dev.metaschema.oscal.lib.profile.resolver.selection;
   
   import org.apache.logging.log4j.LogManager;
   import org.apache.logging.log4j.Logger;
  
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.LinkedHashSet;
  import java.util.List;
  import java.util.Set;
  
  import dev.metaschema.core.util.ObjectUtils;
  import dev.metaschema.oscal.lib.model.Catalog;
  import dev.metaschema.oscal.lib.model.CatalogGroup;
  import dev.metaschema.oscal.lib.model.Control;
  import dev.metaschema.oscal.lib.model.Parameter;
  import edu.umd.cs.findbugs.annotations.NonNull;
  import nl.talsmasoftware.lazy4j.Lazy;
  
  public class DefaultResult implements IResult {
    private static final Logger LOGGER = LogManager.getLogger(DefaultResult.class);
  
    @NonNull
    private final Lazy<Set<Control>> promotedControls = ObjectUtils.notNull(Lazy.of(LinkedHashSet::new));
    @NonNull
    private final Lazy<Set<Parameter>> promotedParameters = ObjectUtils.notNull(Lazy.of(LinkedHashSet::new));
    @NonNull
    private final Lazy<Set<CatalogGroup>> removedGroups = ObjectUtils.notNull(Lazy.of(HashSet::new));
    @NonNull
    private final Lazy<Set<Control>> removedControls = ObjectUtils.notNull(Lazy.of(HashSet::new));
    @NonNull
    private final Lazy<Set<Parameter>> removedParameters = ObjectUtils.notNull(Lazy.of(HashSet::new));
  
    @SuppressWarnings("null")
    @NonNull
    protected Collection<Parameter> getPromotedParameters() {
      return promotedParameters.getIfAvailable().orElse(Collections.emptySet());
    }
  
    @SuppressWarnings("null")
    @NonNull
    protected Collection<Control> getPromotedControls() {
      return promotedControls.getIfAvailable().orElse(Collections.emptySet());
    }
  
    @SuppressWarnings("null")
    @NonNull
    protected Collection<CatalogGroup> getRemovedGroups() {
      return removedGroups.getIfAvailable().orElse(Collections.emptySet());
    }
  
    @SuppressWarnings("null")
    @NonNull
    protected Collection<Control> getRemovedControls() {
      return removedControls.getIfAvailable().orElse(Collections.emptySet());
    }
  
    @SuppressWarnings("null")
    @NonNull
    protected Collection<Parameter> getRemovedParameters() {
      return removedParameters.getIfAvailable().orElse(Collections.emptySet());
    }
  
    @Override
    public void promoteParameter(@NonNull Parameter param) {
      if (LOGGER.isDebugEnabled()) {
        LOGGER.atDebug().log("promoting parameter '{}'", param.getId());
      }
      promotedParameters.get().add(param);
    }
  
    @Override
    public void promoteControl(@NonNull Control control) {
      if (LOGGER.isDebugEnabled()) {
        LOGGER.atDebug().log("promoting control '{}'", control.getId());
      }
      // promote
      promotedControls.get().add(control);
    }
  
    @Override
    public void applyTo(@NonNull Catalog parent) {
      applyRemovesTo(parent);
      getPromotedParameters().forEach(param -> parent.addParam(ObjectUtils.notNull(param)));
      getPromotedControls().forEach(control -> {
        assert control != null;
        // add promoted control
        parent.addControl(control);
        control.setParentControl(null);
      });
    }
  
    @Override
   public void applyTo(@NonNull CatalogGroup parent) {
     applyRemovesTo(parent);
     getPromotedControls().forEach(control -> {
       assert control != null;
       parent.addControl(control);
       control.setParentControl(null);
     });
     getPromotedParameters().forEach(param -> parent.addParam(ObjectUtils.notNull(param)));
   }
 
   @Override
   public void applyTo(@NonNull Control parent) {
     applyRemovesTo(parent);
     getPromotedControls().forEach(control -> {
       assert control != null;
       parent.addControl(control);
       control.setParentControl(null);
     });
     getPromotedParameters().forEach(param -> parent.addParam(ObjectUtils.notNull(param)));
   }
 
   public void applyRemovesTo(Catalog parent) {
     removeItems(parent.getGroups(), getRemovedGroups());
     removeItems(parent.getControls(), getRemovedControls());
     removeItems(parent.getParams(), getRemovedParameters());
   }
 
   public void applyRemovesTo(CatalogGroup parent) {
     removeItems(parent.getGroups(), getRemovedGroups());
     removeItems(parent.getControls(), getRemovedControls());
     removeItems(parent.getParams(), getRemovedParameters());
   }
 
   public void applyRemovesTo(Control parent) {
     removeItems(parent.getControls(), getRemovedControls());
     removeItems(parent.getParams(), getRemovedParameters());
   }
 
   public DefaultResult append(@NonNull DefaultResult that) {
     lazyAppend(promotedControls, that.promotedControls);
     lazyAppend(promotedParameters, that.promotedParameters);
     lazyAppend(removedGroups, that.removedGroups);
     lazyAppend(removedControls, that.removedControls);
     lazyAppend(removedParameters, that.removedParameters);
     return this;
   }
 
   public DefaultResult appendPromoted(@NonNull DefaultResult that) {
     lazyAppend(promotedControls, that.promotedControls);
     lazyAppend(promotedParameters, that.promotedParameters);
     return this;
   }
 
   protected static <T> void lazyAppend(@NonNull Lazy<Set<T>> self, @NonNull Lazy<Set<T>> other) {
     if (other.isAvailable()) {
       Set<T> otherSet = other.get();
       if (!otherSet.isEmpty()) {
         self.get().addAll(otherSet);
       }
     }
   }
 
   protected static <T> void removeItems(List<T> list, @NonNull Collection<T> itemsToDelete) {
     itemsToDelete.forEach(item -> {
       if (!list.remove(item)) {
         LOGGER.atError().log("item didn't exist in list");
       }
     });
   }
 
   public void removeGroup(CatalogGroup group) {
     if (LOGGER.isDebugEnabled()) {
       LOGGER.atDebug().log("Requesting removal of group '{}'.", group.getId());
     }
     removedGroups.get().add(group);
   }
 
   public void removeControl(Control control) {
     if (LOGGER.isDebugEnabled()) {
       LOGGER.atDebug().log("Requesting removal of control '{}'.", control.getId());
     }
     removedControls.get().add(control);
   }
 
   public void removeParameter(Parameter parameter) {
     if (LOGGER.isDebugEnabled()) {
       LOGGER.atDebug().log("Requesting removal of parameter '{}'.", parameter.getId());
     }
     removedParameters.get().add(parameter);
   }
 }