/*
    * SPDX-FileCopyrightText: none
    * SPDX-License-Identifier: CC0-1.0
    */
   
   package dev.metaschema.databind.codegen;
   
   import java.io.IOException;
   import java.nio.file.Path;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.stream.Collectors;
  import java.util.stream.Stream;
  
  import dev.metaschema.core.model.IModule;
  import dev.metaschema.core.util.ObjectUtils;
  import dev.metaschema.databind.codegen.typeinfo.IMetaschemaClassFactory;
  import edu.umd.cs.findbugs.annotations.NonNull;
  
  /**
   * Default implementation of {@link IProduction} that tracks generated classes
   * for modules and packages.
   */
  class ProductionImpl implements IProduction {
  
    @NonNull
    private final Map<IModule, IGeneratedModuleClass> moduleToProductionMap // NOPMD - immutable
        = new HashMap<>();
    @NonNull
    private final Map<String, IPackageProduction> packageNameToProductionMap // NOPMD - immutable
        = new HashMap<>();
  
    /**
     * Add a module and its imports to this production.
     *
     * @param module
     *          the module to add
     * @param classFactory
     *          the class factory to use for generation
     * @param targetDirectory
     *          the target directory for generated classes
     * @throws IOException
     *           if an error occurs during generation
     */
    public void addModule(
        @NonNull IModule module,
        @NonNull IMetaschemaClassFactory classFactory,
        @NonNull Path targetDirectory) throws IOException {
      for (IModule importedModule : module.getImportedModules()) {
        assert importedModule != null;
        addModule(importedModule, classFactory, targetDirectory);
      }
  
      if (moduleToProductionMap.get(module) == null) {
        IGeneratedModuleClass metaschemaClass = classFactory.generateClass(module, targetDirectory);
        moduleToProductionMap.put(module, metaschemaClass);
      }
    }
  
    /**
     * Add a package to this production.
     *
     * @param metadata
     *          the package metadata
     * @param classFactory
     *          the class factory to use for generation
     * @param targetDirectory
     *          the target directory for generated classes
     * @return the generated package production
     * @throws IOException
     *           if an error occurs during generation
     */
    protected IPackageProduction addPackage(
        @NonNull PackageMetadata metadata,
        @NonNull IMetaschemaClassFactory classFactory,
        @NonNull Path targetDirectory)
        throws IOException {
      String javaPackage = metadata.getPackageName();
  
      IPackageProduction retval
          = new PackageProductionImpl(
              metadata,
              classFactory,
              targetDirectory);
      packageNameToProductionMap.put(javaPackage, retval);
      return retval;
    }
  
    @Override
    @SuppressWarnings("null")
    public Collection<IGeneratedModuleClass> getModuleProductions() {
      return Collections.unmodifiableCollection(moduleToProductionMap.values());
    }
  
    /**
     * Get all package productions in this production.
    *
    * @return an unmodifiable collection of package productions
    */
   @SuppressWarnings("null")
   @NonNull
   protected Collection<IPackageProduction> getPackageProductions() {
     return Collections.unmodifiableCollection(packageNameToProductionMap.values());
   }
 
   @Override
   public IGeneratedModuleClass getModuleProduction(IModule module) {
     return moduleToProductionMap.get(module);
   }
 
   @Override
   public List<IGeneratedDefinitionClass> getGlobalDefinitionClasses() {
     return ObjectUtils.notNull(getModuleProductions().stream()
         .flatMap(metaschema -> metaschema.getGeneratedDefinitionClasses().stream())
         .collect(Collectors.toUnmodifiableList()));
   }
 
   @Override
   public Stream<? extends IGeneratedClass> getGeneratedClasses() {
     return ObjectUtils.notNull(Stream.concat(
         // generated definitions and Metaschema module
         getModuleProductions().stream()
             .flatMap(module -> Stream.concat(
                 Stream.of(module),
                 module.getGeneratedDefinitionClasses().stream())),
         // generated package-info.java
         getPackageProductions().stream()
             .flatMap(javaPackage -> Stream.of(javaPackage.getGeneratedClass()))));
   }
 
 }