package org.madore.damlengine;

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

public final class TodoEntryElement extends TodoDefaultElement {

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

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

    @Override
    public void handleNodeOnly() {
	if ( ! ( caller instanceof TodoWeblogElement
		 || caller instanceof TodoWeblogSelectElement ) )
	    throw new IllegalArgumentException("entry node can only be child of weblog node");

	Element div = ctx.doc.createElementNS(DamlEngine.XHTML_NS, "div");
	String explicitLang = LangHelper.getLangNorec(node);
	if ( explicitLang != null )
	    LangHelper.setLangNorec(div, explicitLang);
	node.getParentNode().replaceChild(div, node);

	String entryNumberStr = node.getAttributeNS(null, "number");
	if ( ! Pattern.matches("^\\d{4}$", entryNumberStr) )
	    throw new IllegalArgumentException("entry number attribute must be of the form NNNN");
	String entryDateStr = node.getAttributeNS(null, "date");
	Matcher entryDateMatcher = Pattern.compile("^(\\d{4})-(\\d{2})-(\\d{2})$").matcher(entryDateStr);
	if ( ! entryDateMatcher.matches() )
	    throw new IllegalArgumentException("entry date attribute must be of the form YYYY-MM-DD");
	String entryYearStr = entryDateMatcher.group(1);
	String entryMonthStr = entryDateMatcher.group(2);
	String entryDayStr = entryDateMatcher.group(3);
	String entryDowStr = node.getAttributeNS(null, "day_of_week");

	String entryIdStr = "d."+entryDateStr+"."+entryNumberStr;
	div.setAttributeNS(null, "id", entryIdStr);
	div.setAttributeNS(null, "class", "weblog-entry");
	{
	    String styleAtt = node.getAttributeNS(null, "style");
	    if ( ! styleAtt.equals("") )
		node.setAttributeNS(null, "style", styleAtt);
	}
	div.appendChild(ctx.doc.createTextNode("\n"));

	Element header = ctx.doc.createElementNS(DamlEngine.XHTML_NS, "p");
	header.setAttributeNS(null, "class", "weblog-entry-header");
	div.appendChild(header);
	div.appendChild(ctx.doc.createTextNode("\n"));

	Element permalink = ctx.doc.createElementNS(DamlEngine.XHTML_NS, "a");
	permalink.setAttributeNS(null, "href",
				 entryYearStr+"-"+entryMonthStr+".html"
				 +"#"+entryIdStr);
	permalink.appendChild(ctx.doc.createTextNode(entryDateStr));
	header.appendChild(permalink);
	if ( ! entryDowStr.equals("") )
	    header.appendChild(ctx.doc.createTextNode(" ("+entryDowStr+")"));

	Context ctx2 = ctx.clone();
	ctx2.ent
	    = new Context.EntryContext(entryYearStr, entryMonthStr, entryDayStr,
				       entryNumberStr, entryDowStr);
	ctx2.ent.headerNode = header;

	ArrayList<Node> childList = getChildList(this.node);
	ArrayList<TodoElement> toProcess = new ArrayList<TodoElement>(childList.size()+8);
	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("entry element cannot contain text");
		div.appendChild(ctx.doc.createTextNode("\n"));
	    } else if ( child.getNodeType() == Node.ELEMENT_NODE ) {
		div.appendChild(child);
		TodoElement it
		    = TodoElement.getTodoElement((Element)child, ctx2, this);
		toProcess.add(it);
	    }
	}
	if ( node.getAttributeNS(null, "nocomments").equals("") ) {
	    Element token = ctx.doc.createElementNS(DamlEngine.DAML_NS,
						    "d:implicit-do-comments");
	    div.appendChild(token);
	    div.appendChild(ctx.doc.createTextNode("\n"));
	    toProcess.add(new TodoComments(token, ctx2, this));
	}
	this.ownerDeque.registerAtStart(toProcess);
    }

}