/*
    * SPDX-FileCopyrightText: none
    * SPDX-License-Identifier: CC0-1.0
    */
   
   package gov.nist.secauto.metaschema.cli.commands;
   
   import gov.nist.secauto.metaschema.cli.processor.CLIProcessor.CallingContext;
   import gov.nist.secauto.metaschema.cli.processor.command.CommandExecutionException;
  import gov.nist.secauto.metaschema.cli.processor.command.ICommandExecutor;
  import gov.nist.secauto.metaschema.core.model.IBoundObject;
  import gov.nist.secauto.metaschema.core.model.IModule;
  import gov.nist.secauto.metaschema.core.util.CollectionUtil;
  import gov.nist.secauto.metaschema.core.util.ObjectUtils;
  import gov.nist.secauto.metaschema.databind.IBindingContext;
  import gov.nist.secauto.metaschema.databind.io.Format;
  import gov.nist.secauto.metaschema.databind.io.FormatDetector;
  import gov.nist.secauto.metaschema.databind.io.IBoundLoader;
  import gov.nist.secauto.metaschema.databind.io.IDeserializer;
  import gov.nist.secauto.metaschema.databind.io.ISerializer;
  import gov.nist.secauto.metaschema.databind.io.ModelDetector;
  
  import org.apache.commons.cli.CommandLine;
  import org.apache.commons.cli.Option;
  
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.Writer;
  import java.net.URI;
  import java.net.URL;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.List;
  
  import edu.umd.cs.findbugs.annotations.NonNull;
  
  /**
   * This command implementation supports the conversion of a content instance
   * between supported formats based on a provided Metaschema module.
   */
  class ConvertContentUsingModuleCommand
      extends AbstractConvertSubcommand {
    @NonNull
    private static final String COMMAND = "convert";
  
    @Override
    public String getName() {
      return COMMAND;
    }
  
    @Override
    public String getDescription() {
      return "Convert the provided resource aligned to the provided Metaschema module to the specified format.";
    }
  
    @Override
    public Collection<? extends Option> gatherOptions() {
      Collection<? extends Option> orig = super.gatherOptions();
  
      List<Option> retval = new ArrayList<>(orig.size() + 1);
      retval.addAll(orig);
      retval.add(MetaschemaCommands.METASCHEMA_REQUIRED_OPTION);
  
      return CollectionUtil.unmodifiableCollection(retval);
    }
  
    @Override
    public ICommandExecutor newExecutor(CallingContext callingContext, CommandLine commandLine) {
  
      return new CommandExecutor(callingContext, commandLine);
    }
  
    private final class CommandExecutor
        extends AbstractConversionCommandExecutor {
  
      private CommandExecutor(
          @NonNull CallingContext callingContext,
          @NonNull CommandLine commandLine) {
        super(callingContext, commandLine);
      }
  
      @Override
      protected IBindingContext getBindingContext() throws CommandExecutionException {
        IBindingContext retval = MetaschemaCommands.newBindingContextWithDynamicCompilation();
  
        @SuppressWarnings("synthetic-access")
        IModule module = MetaschemaCommands.loadModule(
            getCommandLine(),
            MetaschemaCommands.METASCHEMA_REQUIRED_OPTION,
            ObjectUtils.notNull(getCurrentWorkingDirectory().toUri()),
            retval);
        retval.registerModule(module);
        return retval;
      }
  
      @Override
      protected void handleConversion(URI source, Format toFormat, Writer writer, IBoundLoader loader)
          throws FileNotFoundException, IOException {
       URI resourceUri = loader.resolve(source);
       URL resource = resourceUri.toURL();
 
       try (InputStream is = resource.openStream()) {
         assert is != null;
 
         FormatDetector.Result formatMatch = loader.detectFormat(is, resourceUri);
         Format format = formatMatch.getFormat();
 
         try (InputStream formatStream = formatMatch.getDataStream()) {
           try (ModelDetector.Result modelMatch = loader.detectModel(formatStream, resourceUri, format)) {
 
             IBindingContext bindingContext = loader.getBindingContext();
 
             IDeserializer<?> deserializer = bindingContext.newDeserializer(format, modelMatch.getBoundClass());
             deserializer.applyConfiguration(loader);
             try (InputStream modelStream = modelMatch.getDataStream()) {
               IBoundObject obj = deserializer.deserialize(modelStream, resourceUri);
 
               ISerializer<?> serializer = bindingContext.newSerializer(toFormat, modelMatch.getBoundClass());
               serializer.serialize(obj, writer);
             }
 
           }
         }
       }
     }
 
   }
 
 }