/*
 * Copyright 2012 astamuse company,Ltd.
 * 
 * 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.astamuse.asta4d.render.transformer;

import java.util.concurrent.Future;

import org.jsoup.nodes.Element;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.astamuse.asta4d.Component;
import com.astamuse.asta4d.render.ElementRemover;
import com.astamuse.asta4d.render.ElementSetter;
import com.astamuse.asta4d.render.Renderable;
import com.astamuse.asta4d.render.Renderer;
import com.astamuse.asta4d.render.SpecialRenderer;
import com.astamuse.asta4d.render.TextSetter;

public class TransformerFactory {

    private final static boolean treatNullAsRemoveNode;
    static {
        String treat = System.getProperty("com.astamuse.asta4d.render.treatNullAsRemoveNode");
        if (treat == null) {
            treatNullAsRemoveNode = true;
        } else {
            treatNullAsRemoveNode = Boolean.parseBoolean(treat);
        }
    }

    private final static Logger logger = LoggerFactory.getLogger(TransformerFactory.class);

    public final static Transformer<?> generateTransformer(Object action) {
        Transformer<?> transformer;
        if (action == null && treatNullAsRemoveNode) {
            transformer = new ElementRemover();
        } else if (action instanceof Renderer) {
            // most of list rendering will return a list of Renderer, so put it at the first place
            transformer = new RendererTransformer((Renderer) action);
        } else if (action instanceof SpecialRenderer) {
            transformer = SpecialRenderer.retrieveTransformer((SpecialRenderer) action);
        } else if (action instanceof ElementSetter) {
            transformer = new ElementSetterTransformer((ElementSetter) action);
        } else if (action instanceof Future) {
            transformer = new FutureTransformer((Future<?>) action);
        } else if (action instanceof Element) {
            transformer = new ElementTransformer((Element) action);
        } else if (action instanceof Component) {
            transformer = new ElementTransformer(((Component) action).toElement());
        } else if (action instanceof Renderable) {
            transformer = new RenderableTransformer((Renderable) action);
        } else {
            transformer = new ElementSetterTransformer(new TextSetter(action));
        }
        return transformer;
    }
}