/*
    * SPDX-FileCopyrightText: none
    * SPDX-License-Identifier: CC0-1.0
    */
   
   package dev.metaschema.databind.codegen;
   
   import java.io.IOException;
   import java.nio.file.Path;
  
  import dev.metaschema.core.model.IModule;
  import dev.metaschema.core.model.MetaschemaException;
  import dev.metaschema.core.util.ObjectUtils;
  import dev.metaschema.databind.model.IBoundModule;
  import edu.umd.cs.findbugs.annotations.NonNull;
  
  /**
   * Default implementation of {@link IModuleBindingGenerator} that generates and
   * compiles Java classes for a Metaschema module.
   * <p>
   * This generator creates Java source files representing the module and its
   * definitions, compiles them, and loads the resulting classes using a custom
   * class loader.
   */
  public class DefaultModuleBindingGenerator implements IModuleBindingGenerator {
    @NonNull
    private final Path compilePath;
  
    /**
     * Construct a new binding generator that generates classes in the specified
     * directory.
     *
     * @param compilePath
     *          the directory where generated Java classes will be created and
     *          compiled
     */
    public DefaultModuleBindingGenerator(@NonNull Path compilePath) {
      this.compilePath = compilePath;
    }
  
    @Override
    public Class<? extends IBoundModule> generate(IModule module) throws MetaschemaException {
      ClassLoader classLoader = ModuleCompilerHelper.newClassLoader(
          compilePath,
          ObjectUtils.notNull(Thread.currentThread().getContextClassLoader()));
  
      IProduction production;
      try {
        production = ModuleCompilerHelper.compileMetaschema(module, compilePath);
      } catch (IOException ex) {
        throw new MetaschemaException(
            String.format("Unable to generate and compile classes for module '%s'.", module.getLocation()),
            ex);
      }
  
      try {
        return ObjectUtils.notNull(production.getModuleProduction(module)).load(classLoader);
      } catch (ClassNotFoundException ex) {
        throw new IllegalStateException(ex);
      }
    }
  
  }