/*
    * SPDX-FileCopyrightText: none
    * SPDX-License-Identifier: CC0-1.0
    */
   
   package gov.nist.secauto.metaschema.schemagen.json.impl;
   
   import gov.nist.secauto.metaschema.core.metapath.StaticMetapathException;
   import gov.nist.secauto.metaschema.core.model.IDefinition;
  import gov.nist.secauto.metaschema.core.model.IFlagInstance;
  import gov.nist.secauto.metaschema.core.model.IModelDefinition;
  import gov.nist.secauto.metaschema.core.model.util.ModuleUtils;
  import gov.nist.secauto.metaschema.core.util.ObjectUtils;
  import gov.nist.secauto.metaschema.schemagen.IGenerationState;
  import gov.nist.secauto.metaschema.schemagen.json.IDefinitionJsonSchema;
  import gov.nist.secauto.metaschema.schemagen.json.IJsonGenerationState;
  
  import java.util.List;
  import java.util.Map;
  import java.util.Objects;
  import java.util.stream.Collectors;
  import java.util.stream.Stream;
  
  import edu.umd.cs.findbugs.annotations.NonNull;
  import edu.umd.cs.findbugs.annotations.Nullable;
  import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
  
  public abstract class AbstractModelDefinitionJsonSchema<D extends IModelDefinition>
      extends AbstractDefinitionJsonSchema<D> {
    @Nullable
    private final String jsonKeyFlagName;
    @Nullable
    private final String discriminatorProperty;
    @Nullable
    private final String discriminatorValue;
    @NonNull
    private final List<FlagInstanceJsonProperty> flagProperties;
    @NonNull
    private final IKey key;
  
    @SuppressFBWarnings(value = "CT_CONSTRUCTOR_THROW", justification = "Use of final fields")
    protected AbstractModelDefinitionJsonSchema(
        @NonNull D definition,
        @Nullable String jsonKeyFlagName,
        @Nullable String discriminatorProperty,
        @Nullable String discriminatorValue) {
      super(definition);
      this.jsonKeyFlagName = jsonKeyFlagName;
      this.discriminatorProperty = discriminatorProperty;
      this.discriminatorValue = discriminatorValue;
      this.key = IKey.of(definition, jsonKeyFlagName, discriminatorProperty, discriminatorValue);
  
      Stream<? extends IFlagInstance> flagStream = definition.getFlagInstances().stream();
  
      // determine the flag instances to generate
      if (jsonKeyFlagName != null) {
        IFlagInstance jsonKeyFlag;
        try {
          jsonKeyFlag = definition.getFlagInstanceByName(
              ModuleUtils.parseFlagName(definition.getContainingModule(), jsonKeyFlagName).getIndexPosition());
        } catch (StaticMetapathException ex) {
          throw new IllegalArgumentException(ex);
        }
        if (jsonKeyFlag == null) {
          throw new IllegalArgumentException(
              String.format("The referenced json-key flag-name '%s' does not exist on definition '%s'.",
                  jsonKeyFlagName,
                  definition.getName()));
        }
        flagStream = flagStream.filter(instance -> !jsonKeyFlag.equals(instance));
      }
  
      this.flagProperties = ObjectUtils.notNull(flagStream
          .map(instance -> new FlagInstanceJsonProperty(ObjectUtils.requireNonNull(instance)))
          .collect(Collectors.toUnmodifiableList()));
    }
  
    @Override
    public IKey getKey() {
      return key;
    }
  
    protected String getJsonKeyFlagName() {
      return jsonKeyFlagName;
    }
  
    protected String getDiscriminatorProperty() {
      return discriminatorProperty;
    }
  
    protected String getDiscriminatorValue() {
      return discriminatorValue;
    }
  
    @Override
    protected String generateDefinitionName(IJsonGenerationState state) {
      IModelDefinition definition = getDefinition();
      StringBuilder builder = new StringBuilder();
      if (jsonKeyFlagName != null) {
       builder
           .append(IGenerationState.toCamelCase(jsonKeyFlagName))
           .append("JsonKey");
     }
 
     if (discriminatorProperty != null || discriminatorValue != null) {
       builder
           .append(IGenerationState.toCamelCase(ObjectUtils.requireNonNull(discriminatorProperty)))
           .append(IGenerationState.toCamelCase(ObjectUtils.requireNonNull(discriminatorValue)))
           .append("Choice");
     }
     return state.getTypeNameForDefinition(
         definition,
         builder.toString());
   }
 
   protected List<FlagInstanceJsonProperty> getFlagProperties() {
     return flagProperties;
   }
 
   @Override
   public void gatherDefinitions(
       @NonNull Map<IKey, IDefinitionJsonSchema<?>> gatheredDefinitions,
       @NonNull IJsonGenerationState state) {
     super.gatherDefinitions(gatheredDefinitions, state);
 
     for (FlagInstanceJsonProperty property : getFlagProperties()) {
       property.gatherDefinitions(gatheredDefinitions, state);
     }
   }
 
   public static class ComplexKey implements IKey {
     @NonNull
     private final IDefinition definition;
     @Nullable
     private final String jsonKeyFlagName;
     @Nullable
     private final String discriminatorProperty;
     @Nullable
     private final String discriminatorValue;
 
     public ComplexKey(
         @NonNull IDefinition definition,
         @Nullable String jsonKeyFlagName,
         @Nullable String discriminatorProperty,
         @Nullable String discriminatorValue) {
       this.definition = definition;
       this.jsonKeyFlagName = jsonKeyFlagName;
       this.discriminatorProperty = discriminatorProperty;
       this.discriminatorValue = discriminatorValue;
     }
 
     @Override
     @NonNull
     public IDefinition getDefinition() {
       return definition;
     }
 
     @Override
     @Nullable
     public String getJsonKeyFlagName() {
       return jsonKeyFlagName;
     }
 
     @Override
     public String getDiscriminatorProperty() {
       return discriminatorProperty;
     }
 
     @Override
     public String getDiscriminatorValue() {
       return discriminatorValue;
     }
 
     @Override
     public int hashCode() {
       return Objects.hash(definition, jsonKeyFlagName, discriminatorProperty, discriminatorValue);
     }
 
     @SuppressWarnings("PMD.OnlyOneReturn")
     @Override
     public boolean equals(Object obj) {
       if (this == obj) {
         return true;
       }
       if (!(obj instanceof IKey)) {
         return false;
       }
       IKey other = (IKey) obj;
       return Objects.equals(definition, other.getDefinition())
           && Objects.equals(jsonKeyFlagName, other.getJsonKeyFlagName())
           && Objects.equals(discriminatorProperty, other.getDiscriminatorProperty())
           && Objects.equals(discriminatorValue, other.getDiscriminatorValue());
     }
   }
 }