/*
 * Copyright 2010 Google Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.google.gwt.requestfactory.rebind;

import com.google.gwt.core.ext.GeneratorContext;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.core.ext.typeinfo.JClassType;
import com.google.gwt.editor.rebind.AbstractEditorDriverGenerator;
import com.google.gwt.editor.rebind.model.EditorData;
import com.google.gwt.editor.rebind.model.EditorModel;
import com.google.gwt.requestfactory.client.RequestFactoryEditorDriver;
import com.google.gwt.requestfactory.client.impl.AbstractRequestFactoryEditorDriver;
import com.google.gwt.requestfactory.client.impl.RequestFactoryEditorDelegate;
import com.google.gwt.requestfactory.shared.EntityProxy;
import com.google.gwt.user.rebind.SourceWriter;

import java.util.List;
import java.util.Map;

/**
 * Generates implementations of RFEDs.
 */
public class RequestFactoryEditorDriverGenerator extends
    AbstractEditorDriverGenerator {

  private JClassType entityProxyType;

  @Override
  public String generate(TreeLogger logger, GeneratorContext context,
      String typeName) throws UnableToCompleteException {
    entityProxyType = context.getTypeOracle().findType(
        EntityProxy.class.getCanonicalName());
    return super.generate(logger, context, typeName);
  }

  @Override
  protected Class<?> getDriverInterfaceType() {
    return RequestFactoryEditorDriver.class;
  }

  @Override
  protected Class<?> getDriverSuperclassType() {
    return AbstractRequestFactoryEditorDriver.class;
  }

  @Override
  protected Class<?> getEditorDelegateType() {
    return RequestFactoryEditorDelegate.class;
  }

  @Override
  protected String mutableObjectExpression(EditorData data,
      String sourceObjectExpression) {
    if (entityProxyType.isAssignableFrom(data.getPropertyOwnerType())) {
      return String.format("((%s) request.edit((%s)))",
          data.getPropertyOwnerType().getQualifiedSourceName(),
          sourceObjectExpression);
    } else {
      return sourceObjectExpression;
    }
  }

  @Override
  protected void writeAdditionalContent(TreeLogger logger,
      GeneratorContext context, EditorModel model, SourceWriter sw)
      throws UnableToCompleteException {
    sw.println("protected void traverseEditors(%s<String> paths) {",
        List.class.getName());
    sw.indentln("%s.traverseEditor(getEditor(), \"\", paths);",
        getEditorDelegate(model.getRootData()));
    sw.println("}");
  }

  @Override
  protected void writeDelegateInitialization(SourceWriter sw, EditorData d,
      Map<EditorData, String> delegateFields) {
    sw.println("%s.initialize(eventBus, factory, "
        + "appendPath(\"%s\"), getObject()%s.%s()," + " editor.%s,"
        + " delegateMap, request);", delegateFields.get(d),
        d.getPropertyName(), d.getBeanOwnerExpression(), d.getGetterName(),
        d.getSimpleExpression());
  }
}