package org.madore.damlengine;

import java.util.ArrayList;
import java.util.regex.Pattern;
import org.w3c.dom.*;

public final class TodoBodyElement extends TodoDefaultElement {

    public static class Factory extends TodoElement.Factory {
	@Override
	public TodoBodyElement newItem(Element node,
				       Context ctx,
				       TodoItem caller) {
	    return new TodoBodyElement(node, ctx, caller);
	}
    }

    public TodoBodyElement(Element node,
			   Context ctx,
			   TodoItem caller) {
	super(node, ctx, caller);
    }

    @Override
    public void handleNodeOnly() {
	if ( ! ( caller instanceof TodoDamlElement ) )
	    throw new IllegalArgumentException("body node can only be child of daml node");

	Element parent = (Element)(this.node.getParentNode());
	String explicitLang = LangHelper.getLangNorec(this.node);
	ArrayList<Node> childList = getChildList(this.node);
	ArrayList<TodoElement> toProcess = new ArrayList<TodoElement>(childList.size());
	for ( Node child : childList ) {
	    if ( child.getNodeType() == Node.TEXT_NODE
		 || child.getNodeType() == Node.CDATA_SECTION_NODE ) {
		if ( ! Pattern.matches("^\\s*$",((CharacterData)child).getData()) )
		    throw new IllegalArgumentException("body element cannot contain text");
	    }
	    parent.insertBefore(child, node);
	    if ( child.getNodeType() == Node.ELEMENT_NODE ) {
		if ( explicitLang != null )
		    LangHelper.setWeakLangNorec((Element)child, explicitLang);
		TodoElement it
		    = TodoElement.getTodoElement((Element)child, this.ctx, this);
		toProcess.add(it);
	    }
	}
	parent.removeChild(node);
	this.ownerDeque.registerAtStart(toProcess);
    }

}