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/*
 * Copyright 2008-2012 the original author or authors.
 *
 * 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 org.broadleafcommerce.openadmin.generator;

import com.google.gwt.core.ext.Generator;
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.core.ext.typeinfo.NotFoundException;
import com.google.gwt.core.ext.typeinfo.TypeOracle;
import com.google.gwt.user.rebind.ClassSourceFileComposerFactory;
import com.google.gwt.user.rebind.SourceWriter;

import java.io.PrintWriter;

/**
 * 
 * @author jfischer
 *
 */
public class FactoryGenerator extends Generator {

	public static final String INSTANTIABLE_TYPE = "org.broadleafcommerce.openadmin.client.reflection.Instantiable";
	public static final String VALIDATOR_TYPE = "com.smartgwt.client.widgets.form.validator.Validator";
	
	public String generate(TreeLogger logger, GeneratorContext context, String typeName) throws UnableToCompleteException {
		logger.log(TreeLogger.INFO, "Generating source for " + typeName, null);
		TypeOracle typeOracle = context.getTypeOracle();
		JClassType clazz = typeOracle.findType(typeName);
		if (clazz == null) {
			logger.log(TreeLogger.ERROR, "Unable to find metadata for type '"
			+ typeName + "'", null);
			throw new UnableToCompleteException();
		}
		try {
			logger.log(TreeLogger.INFO, "Generating source for " + clazz.getQualifiedSourceName(), null);
			JClassType[] reflectableTypes = {typeOracle.getType(INSTANTIABLE_TYPE)};
            JClassType[] validatorTypes = {typeOracle.getType(VALIDATOR_TYPE)};
			SourceWriter sourceWriter = getSourceWriter(clazz, context, logger);
			if (sourceWriter != null) {
                sourceWriter.println("public java.lang.Object newInstance(String className) {");
				for (JClassType validatorType : validatorTypes) {
					JClassType[] types = typeOracle.getTypes();
					int count = 0;
					for (int i = 0; i < types.length; i++) {
						if (types[i].isInterface() == null
						&& !types[i].isAbstract()
						&& types[i].isAssignableTo(validatorType)) {
							logger.log(TreeLogger.INFO, "Emitting instantiation code for: " + types[i].getQualifiedSourceName(), null);
							if (count == 0) {
								sourceWriter.println("   if(\""
								+ types[i].getQualifiedSourceName()
								+ "\".equals(className)) {"
								+ " return new "
								+ types[i].getQualifiedSourceName() + "();"
								+ "}");
							} else {
								sourceWriter.println("   else if(\""
								+ types[i].getQualifiedSourceName()
								+ "\".equals(className)) {"
								+ " return new "
								+ types[i].getQualifiedSourceName() + "();"
								+ "}");
							}
							count++;
						}
					}
				}
                sourceWriter.println("return null;");
                sourceWriter.println("}");
				sourceWriter.println("public void createAsync(final String className, final AsyncClient asyncClient) {");
				for (JClassType reflectableType : reflectableTypes) {
					JClassType[] types = typeOracle.getTypes();
					int count = 0;
					for (int i = 0; i < types.length; i++) {
						if (types[i].isInterface() == null
						&& !types[i].isAbstract()
						&& types[i].isAssignableTo(reflectableType)) {
							logger.log(TreeLogger.INFO, "Emitting async instantiation code for: " + types[i].getQualifiedSourceName(), null);
							if (count == 0) {
								sourceWriter.println("   if(\""
								+ types[i].getQualifiedSourceName()
								+ "\".equals(className)) {"
                                + "com.google.gwt.core.client.GWT.runAsync(new com.google.gwt.core.client.RunAsyncCallback() {"
                                + "public void onFailure(Throwable err) {"
                                + "asyncClient.onUnavailable();"
                                + "}"
                                + "public void onSuccess() {"
                                + "asyncClient.onSuccess(new "
								+ types[i].getQualifiedSourceName() + "());"
								+ "}});}");
							} else {
								sourceWriter.println("   else if(\""
								+ types[i].getQualifiedSourceName()
								+ "\".equals(className)) {"
								+ "com.google.gwt.core.client.GWT.runAsync(new com.google.gwt.core.client.RunAsyncCallback() {"
                                + "public void onFailure(Throwable err) {"
                                + "asyncClient.onUnavailable();"
                                + "}"
                                + "public void onSuccess() {"
                                + "asyncClient.onSuccess(new "
								+ types[i].getQualifiedSourceName() + "());"
								+ "}});}");
							}
							count++;
						}
					}
				}
				sourceWriter.println("}");
				sourceWriter.commit(logger);
				logger.log(TreeLogger.INFO, "Done Generating source for "
				+ clazz.getName(), null);
			}
			return clazz.getQualifiedSourceName() + "Wrapper";
		} catch (NotFoundException e) {
			e.printStackTrace();
			throw new UnableToCompleteException();
		}
	}

	public SourceWriter getSourceWriter(JClassType classType, GeneratorContext context, TreeLogger logger) {
		String packageName = classType.getPackage().getName();
		String simpleName = classType.getSimpleSourceName() + "Wrapper";
		ClassSourceFileComposerFactory composer = new ClassSourceFileComposerFactory(packageName, simpleName);
		composer.addImplementedInterface("org.broadleafcommerce.openadmin.client.reflection.Factory");
		PrintWriter printWriter = context.tryCreate(logger, packageName, simpleName);
		if (printWriter == null) {
			return null;
		} else {
			SourceWriter sw = composer.createSourceWriter(context, printWriter);
			return sw;
		}
	}

}