package org.madore.damlengine;

import java.util.ArrayList;
import java.util.regex.Pattern;
import java.io.Reader;
import java.io.InputStreamReader;
import java.io.BufferedReader;
import java.io.IOException;
import org.w3c.dom.*;

public final class TodoDamlElement extends TodoDefaultElement {

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

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

    @Override
    public void handleNodeOnly() {
	if ( ! ( caller instanceof DamlEngine.RootTodo ) )
	    throw new IllegalArgumentException("daml node can only be root node");
	final String uriToTopName = "uri-to-top";
	if ( node.hasAttributeNS(null, uriToTopName) )
	    ctx.gc.uriToTop = node.getAttributeNS(null, uriToTopName);
	final String fileNameName = "file.name";
	if ( node.hasAttributeNS(null, fileNameName) )
	    ctx.gc.fileName = node.getAttributeNS(null, fileNameName);

	if ( ctx.gc.htmlNode != null )
	    throw new IllegalStateException("html node already defined at daml node");
	ctx.gc.htmlNode = ctx.doc.createElementNS(DamlEngine.XHTML_NS, "html");
	String lang = LangHelper.getLangNorec(node);
	if ( lang != null )
	    LangHelper.setLangNorec(ctx.gc.htmlNode, lang);
	node.getParentNode().replaceChild(ctx.gc.htmlNode, node);
	ctx.gc.htmlNode.appendChild(ctx.doc.createTextNode("\n"));
	ctx.gc.htmlNode.appendChild(ctx.doc.createComment(" This file is automatically generated.  Do not edit! "));
	ctx.gc.htmlNode.appendChild(ctx.doc.createTextNode("\n"));
	if ( ctx.gc.headNode != null )
	    throw new IllegalStateException("head node already defined at daml node");
	ctx.gc.headNode = ctx.doc.createElementNS(DamlEngine.XHTML_NS, "head");
	ctx.gc.htmlNode.appendChild(ctx.gc.headNode);
	ctx.gc.htmlNode.appendChild(ctx.doc.createTextNode("\n"));
	ctx.gc.headNode.appendChild(ctx.doc.createTextNode("\n"));

	ctx.gc.styleContent = new StringBuffer();
	try {
	    Reader rd = new BufferedReader(new InputStreamReader(DamlEngine.class.getResourceAsStream("included.css"), "UTF-8"));
	    int ch;
	    while ((ch = rd.read()) > -1)
		ctx.gc.styleContent.append((char)ch);
	    rd.close();
	} catch (IOException e) {
	    throw new RuntimeException(e);
	}
	ctx.gc.scriptContent = new StringBuffer();
	try {
	    Reader rd = new BufferedReader(new InputStreamReader(DamlEngine.class.getResourceAsStream("included.js"), "UTF-8"));
	    int ch;
	    while ((ch = rd.read()) > -1)
		ctx.gc.scriptContent.append((char)ch);
	    rd.close();
	} catch (IOException e) {
	    throw new RuntimeException(e);
	}

	Element meta;
	meta = ctx.doc.createElementNS(DamlEngine.XHTML_NS, "meta");
	meta.setAttributeNS(null, "http-equiv", "Content-Type");
	meta.setAttributeNS(null, "content", "text/html; charset=utf-8");
	ctx.gc.headNode.appendChild(meta);
	ctx.gc.headNode.appendChild(ctx.doc.createTextNode("\n"));
	if ( lang != null ) {
	    meta = ctx.doc.createElementNS(DamlEngine.XHTML_NS, "meta");
	    meta.setAttributeNS(null, "http-equiv", "Content-Language");
	    meta.setAttributeNS(null, "content", lang);
	    ctx.gc.headNode.appendChild(meta);
	    ctx.gc.headNode.appendChild(ctx.doc.createTextNode("\n"));
	}
	meta = ctx.doc.createElementNS(DamlEngine.XHTML_NS, "link");
	meta.setAttributeNS(null, "rel", "Shortcut Icon");
	meta.setAttributeNS(null, "href", (((ctx.gc.uriToTop!=null)?ctx.gc.uriToTop:"")
					   +"favicon.ico"));
	ctx.gc.headNode.appendChild(meta);
	ctx.gc.headNode.appendChild(ctx.doc.createTextNode("\n"));

	ArrayList<Node> childList = getChildList(this.node);
	ArrayList<TodoElement> toProcess = new ArrayList<TodoElement>(childList.size());
	for ( Node child : childList ) {
	    if ( child.getNodeType() == Node.ELEMENT_NODE ) {
		if ( child.getLocalName().equals("body") ) {
		    ctx.gc.htmlNode.appendChild(ctx.doc.createTextNode("\n"));
		    ctx.gc.htmlNode.appendChild(child);
		    ctx.gc.htmlNode.appendChild(ctx.doc.createTextNode("\n"));
		} else {
		    ctx.gc.headNode.appendChild(child);
		    ctx.gc.headNode.appendChild(ctx.doc.createTextNode("\n"));
		}
		TodoElement it
		    = TodoElement.getTodoElement((Element)child, this.ctx, this);
		toProcess.add(it);
	    } else if ( child.getNodeType() == Node.TEXT_NODE
			|| child.getNodeType() == Node.CDATA_SECTION_NODE ) {
		if ( ! Pattern.matches("^\\s*$",((CharacterData)child).getData()) )
		    throw new IllegalArgumentException("daml element cannot contain text");
	    }
	}
	this.ownerDeque.registerAtStart(toProcess);
	this.ownerDeque.
	    registerAtEnd(new TodoStyleOrScript(TodoStyleOrScript.Type.STYLE,
						this.ctx, this));
	this.ownerDeque.
	    registerAtEnd(new TodoStyleOrScript(TodoStyleOrScript.Type.SCRIPT,
						this.ctx, this));
    }

}