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/**
 * Copyright (c) 2009-2015 Zauber S.A. 
 *
 * 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 ar.com.zauber.leviathan.scrapper;

import java.io.Reader;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;

import org.apache.commons.lang.Validate;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.oxm.Unmarshaller;

import ar.com.zauber.commons.dao.Closure;
import ar.com.zauber.commons.dao.Transformer;
import ar.com.zauber.commons.dao.closure.TargetTransformerClosure;
import ar.com.zauber.commons.web.transformation.processors.impl.TidyScrapper;
import ar.com.zauber.leviathan.api.URIFetcherResponse;
import ar.com.zauber.leviathan.api.URIFetcherResponse.URIAndCtx;
import ar.com.zauber.leviathan.scrapper.closure.URIFetcherResponseWrapperClosure;
import ar.com.zauber.leviathan.scrapper.transformation.XMLUnmarshallTransformer;
import ar.com.zauber.leviathan.scrapper.transformation.XSLTTransformer;
import ar.com.zauber.leviathan.scrapper.utils.ContextualResponse;

/**
 * {@link FactoryBean} que genera un {@link Closure} que permite escrapear la
 * funcionalidad normal del sistema, armando la cadena de {@link Transformer} y
 * {@link Closure} mediante a {@link TargetTransformerClosure} Arma la cadena
 * mediante a la transformacion XSLT (por el {@link TidyScrapper}) si es
 * necesario agrega la Transformacion {@link XMLUnmarshallTransformer}
 * 
 * @author Marcelo Turrin
 * @since Feb 1, 2010
 */
public class ResourceScrapperClosureFactoryBean implements
        FactoryBean> {

    private final TidyScrapper scrapper;
    private final Unmarshaller unmarshaller;
    private final Closure closure;
    private final Map extraModel = new HashMap();
    private Closure> errorClosure = null;
    
    /** vers constructor */
    public ResourceScrapperClosureFactoryBean(final TidyScrapper scrapper,
            final Closure closure) {
        this(scrapper, null, closure);
    }
    
    public ResourceScrapperClosureFactoryBean(final TidyScrapper scrapper,
            final Unmarshaller unmarshaller, final Closure closure) {
        this(scrapper, unmarshaller, closure, null);
    }
    /**
     * Creates the ResourceScrapperClosureFactoryBean.
     * 
     * @param scrapper
     *            el scrapper a aplicar para la transformaci�n xslt
     * @param unmarshaller
     *            si no se llama directo al closure, post transformaci�n
     * @param closure
     *            el closure final que se aplica en el scrapper
     */
    public ResourceScrapperClosureFactoryBean(final TidyScrapper scrapper,
            final Unmarshaller unmarshaller, final Closure closure,
            final Map extraModel) {
        super();
        Validate.notNull(scrapper);
        Validate.notNull(closure);

        this.scrapper = scrapper;
        this.unmarshaller = unmarshaller;
        this.closure = closure;
        
        if(extraModel != null) {
            this.extraModel.putAll(extraModel);
        }
    }

    
    /** @see FactoryBean#getObject() */
    @SuppressWarnings("unchecked")
    public final Closure getObject() {

        Closure finalClosure = closure;

        if (unmarshaller != null) {
            finalClosure = new TargetTransformerClosure<
                                        ContextualResponse, 
                                        ContextualResponse>(
                    new XMLUnmarshallTransformer(
                            unmarshaller),
                    (Closure>) finalClosure);
        }

         URIFetcherResponseWrapperClosure c 
         	= new URIFetcherResponseWrapperClosure(new TargetTransformerClosure<
                                            ContextualResponse, 
                                            ContextualResponse>
                (new XSLTTransformer(scrapper, extraModel),
                (Closure>) finalClosure));
         if(errorClosure != null){
        	 c.setErrorClosure(errorClosure);
         }
         return c;
    }

    /** @see FactoryBean#getObjectType() */
    @SuppressWarnings("unchecked")
    public final Class> getObjectType() {
        return (Class>) closure
                .getClass();
    }
    
    public final void setErrorClosure(
			Closure> errorClosure) {
		this.errorClosure = errorClosure;
	}
    
    /** @see FactoryBean#isSingleton() */
    public final boolean isSingleton() {
        return true;
    }
}