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");

	// A container <div> that contains everything
	Element containerDiv = ctx.doc.createElementNS(DamlEngine.XHTML_NS, "div");
	node.getParentNode().replaceChild(containerDiv, node);
	Element beforeP = ctx.doc.createElementNS(DamlEngine.XHTML_NS, "p");
	Element afterP = ctx.doc.createElementNS(DamlEngine.XHTML_NS, "p");

	// The <article> element containing the entry itself
	Element article = ctx.doc.createElementNS(DamlEngine.XHTML_NS, "article");
	String lang = LangHelper.getLangRec(node);
	String explicitLang = LangHelper.getLangNorec(node);
	if ( explicitLang != null )
	    LangHelper.setLangNorec(article, explicitLang);
	containerDiv.appendChild(beforeP);
	containerDiv.appendChild(article);
	containerDiv.appendChild(afterP);

	final String entryNumberStr = node.getAttributeNS(null, "number");
	if ( ! Pattern.matches("^\\d{4}$", entryNumberStr) )
	    throw new IllegalArgumentException("entry number attribute must be of the form NNNN");
	final int entryNumber = Integer.parseInt(entryNumberStr);
	final String entryDateStr = node.getAttributeNS(null, "date");
	final Matcher entryDateMatcher = Pattern.compile("^(\\d{4})-(\\d{2})-(\\d{2})$").matcher(entryDateStr);
	if ( ! entryDateMatcher.matches() )
	    throw new IllegalArgumentException("entry date attribute must be of the form YYYY-MM-DD");
	final String entryYearStr = entryDateMatcher.group(1);
	final String entryMonthStr = entryDateMatcher.group(2);
	final String entryDayStr = entryDateMatcher.group(3);
	String entryDowStr = node.getAttributeNS(null, "day-of-week");
	{
	    final int entryYear = Integer.parseInt(entryYearStr);
	    final int entryMonth = Integer.parseInt(entryMonthStr);
	    final int entryDay = Integer.parseInt(entryDayStr);
	    final String entryRefDowStr
		= Calendar.dateDowName(lang, entryYear, entryMonth, entryDay);
	    if ( entryRefDowStr != null ) {
		if ( entryDowStr.equals("") ) {
		    entryDowStr = entryRefDowStr;
		} else if ( ( ! entryDowStr.equals(entryRefDowStr) )
			    && node.getAttributeNS(null, "override-day-of-week").equals("") ) {
		    System.err.println("warning: "+entryDateStr+" day of week given "+entryDowStr+" expected "+entryRefDowStr);
		}
	    }
	}
	final String entryCatStr = node.getAttributeNS(null, "cat");
	final String entrySpecialNameStr
	    = node.hasAttributeNS(null, "special-name")
	    ? node.getAttributeNS(null, "special-name") : null;
	final String entryCdateStr = node.getAttributeNS(null, "cdate");
	final ArrayList<String> entryCatList;
	if ( entryCatStr.equals("") ) {
	    entryCatList = new ArrayList<String>(0);
	} else {
	    String[] temp = entryCatStr.split("\\s+");
	    entryCatList = new ArrayList<String>(temp.length);
	    for ( String cat : temp ) {
		if ( ! cat.equals("") )
		    entryCatList.add(cat);
	    }
	}

	final WeblogLink lk = new WeblogLink(entryYearStr, entryMonthStr,
					     entryDayStr, entryNumberStr, "",
					     entrySpecialNameStr);
	lk.setTypeStandard();
	String entryIdStr = lk.getFragment();
	article.setAttributeNS(null, "id", entryIdStr);
	{
	    String classAtt = node.getAttributeNS(null, "class");
	    if ( ! classAtt.equals("") )
		article.setAttributeNS(null, "class",
				       "weblog-entry hentry "+classAtt);
	    else
		article.setAttributeNS(null, "class", "weblog-entry hentry");
	}
	{
	    String styleAtt = node.getAttributeNS(null, "style");
	    if ( ! styleAtt.equals("") )
		article.setAttributeNS(null, "style", styleAtt);
	}
	article.appendChild(ctx.doc.createTextNode("\n"));

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

	Element permalink = ctx.doc.createElementNS(DamlEngine.XHTML_NS, "a");
	permalink.setAttributeNS(null, "href", lk.getTarget(""));
	permalink.setAttributeNS(null, "rel", "bookmark");
	Element time = ctx.doc.createElementNS(DamlEngine.XHTML_NS, "time");
	permalink.appendChild(time);
	if ( Pattern.matches("^\\d{4}-\\d{2}-\\d{2}T\\d{2}\\:\\d{2}(?:\\:\\d{2})?(?:Z|[\\+\\-]\\d{2}\\:\\d{2})$", entryCdateStr) )
	    time.setAttributeNS(null, "datetime", entryCdateStr);
	else
	    System.err.println("warning: cdate value "+entryCdateStr
			       +" is not a valid HTML5 datetime");
	time.setAttributeNS(null, "pubdate", "pubdate");
	time.setAttributeNS(null, "class", "published");
	time.appendChild(ctx.doc.createTextNode(entryDateStr));
	headlink.appendChild(permalink);
	if ( ! entryDowStr.equals("") )
	    headlink.appendChild(ctx.doc.createTextNode(" ("+entryDowStr+")"));

	// The <div> that contains the entry's body (content)
	Element mainDiv = ctx.doc.createElementNS(DamlEngine.XHTML_NS, "div");
	article.appendChild(mainDiv);
	article.appendChild(ctx.doc.createTextNode("\n"));
	mainDiv.setAttributeNS(null, "class", "entry-content");

	Context ctx2 = ctx.clone();
	ctx2.ent
	    = new Context.EntryContext(entryYearStr, entryMonthStr, entryDayStr,
				       entryNumberStr, entryDowStr,
				       entrySpecialNameStr,
				       entryCatList);
	ctx2.ent.headerNode = header;
	ctx2.ent.headlinkNode = headlink;
	ctx2.ent.mainDivNode = mainDiv;

	ArrayList<Node> childList = getChildList(this.node);
	ArrayList<TodoElement> toProcess = new ArrayList<TodoElement>(childList.size()+8);
	toProcess.add(TodoElement.getTodoElement(beforeP, ctx2, this));
	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");
		mainDiv.appendChild(ctx.doc.createTextNode("\n"));
	    } else if ( child.getNodeType() == Node.ELEMENT_NODE ) {
		if ( child.getLocalName().equals("title") ) {
		    article.appendChild(child);
		} else {
		    mainDiv.appendChild(child);
		}
		TodoElement it
		    = TodoElement.getTodoElement((Element)child, ctx2, this);
		toProcess.add(it);
	    }
	}

	Element footer = ctx.doc.createElementNS(DamlEngine.XHTML_NS, "footer");
	article.appendChild(footer);
	article.appendChild(ctx.doc.createTextNode("\n"));
	footer.setAttributeNS(null, "class", "entry-footer cleared");
	if ( entryCatList.size() > 0 ) {
	    Element token = ctx.doc.createElementNS(DamlEngine.DAML_NS,
						    "d:implicit-do-categories");
	    footer.appendChild(token);
	    footer.appendChild(ctx.doc.createTextNode("\n"));
	    toProcess.add(new TodoCategories(token, ctx2, this));
	}
	if ( node.getAttributeNS(null, "nocomments").equals("") ) {
	    Element token = ctx.doc.createElementNS(DamlEngine.DAML_NS,
						    "d:implicit-do-comments");
	    footer.appendChild(token);
	    footer.appendChild(ctx.doc.createTextNode("\n"));
	    toProcess.add(new TodoComments(token, ctx2, this));
	}
	toProcess.add(TodoElement.getTodoElement(afterP, ctx2, this));

	// Before and after <p>'s
	{
	    final WeblogSummary wsum = WeblogSummary.getSummary(ctx.dc);
	    final class DoLink {
		Element parent;  int num;  String text;  boolean permalink;
		public DoLink(Element parent, int num, String text) {
		    this.parent = parent;
		    this.num = num;
		    this.text = text;
		    this.permalink = false;
		}
		public DoLink(Element parent, int num, String text, boolean permalink) {
		    this.parent = parent;
		    this.num = num;
		    this.text = text;
		    this.permalink = permalink;
		}
		public Element doit() {
		    final WeblogSummary.EntrySummary esum;
		    if ( wsum != null && wsum.entries != null )
			esum = wsum.entries.get(num);
		    else
			esum = null;
		    Element a;
		    if ( esum != null ) {
			a = ctx.doc.createElementNS(DamlEngine.XHTML_NS, "a");
			a.setAttributeNS(DamlEngine.DAML_NS, "d:wref",
					 "#d." + esum.date + "."
					 + String.format("%04d", esum.id));
			if ( permalink )
			    // TodoWrefAttr handles this attribute:
			    a.setAttributeNS(DamlEngine.DAML_NS,
					     "d:wrefcat", "@force-single");
		    } else {
			a = ctx.doc.createElementNS(DamlEngine.XHTML_NS, "del");
		    }
		    a.appendChild(ctx.doc.createTextNode(text));
		    parent.appendChild(a);
		    return a;
		}
	    }

	    Element span, tmp;
	    span = ctx.doc.createElementNS(DamlEngine.XHTML_NS, "span");
	    beforeP.appendChild(span);
	    LangHelper.setLangRec(span, "en");
	    span.appendChild(ctx.doc.createTextNode("\u2193Entry #"+entryNumberStr));
	    span.appendChild(ctx.doc.createTextNode(" ["));
	    new DoLink(span, entryNumber-1, "older").doit();
	    span.appendChild(ctx.doc.createTextNode("|"));
	    tmp = new DoLink(span, entryNumber, "\u203b").doit();
	    tmp.setAttributeNS(null, "style", "opacity: 0.1");
	    span.appendChild(ctx.doc.createTextNode(" "));
	    new DoLink(span, entryNumber, "permalink", true).doit();
	    span.appendChild(ctx.doc.createTextNode("|"));
	    tmp = new DoLink(span, entryNumber+1, "newer").doit();
	    if ( ctx.wsc != null && ctx.wsc.sel != null
		 && ctx.wsc.sel.contains(entryNumber+1) )
		tmp.setAttributeNS(null, "style", "opacity: 0.1");
	    span.appendChild(ctx.doc.createTextNode("]"));
	    beforeP.appendChild(ctx.doc.createTextNode(" / "));
	    span = ctx.doc.createElementNS(DamlEngine.XHTML_NS, "span");
	    beforeP.appendChild(span);
	    LangHelper.setLangRec(span, "fr");
	    span.appendChild(ctx.doc.createTextNode("\u2193Entr\u00e9e #"+entryNumberStr));
	    span.appendChild(ctx.doc.createTextNode(" ["));
	    new DoLink(span, entryNumber-1, "pr\u00e9c\u00e9dente").doit();
	    span.appendChild(ctx.doc.createTextNode("|"));
	    tmp = new DoLink(span, entryNumber, "\u203b").doit();
	    tmp.setAttributeNS(null, "style", "opacity: 0.1");
	    span.appendChild(ctx.doc.createTextNode(" "));
	    new DoLink(span, entryNumber, "permalien", true).doit();
	    span.appendChild(ctx.doc.createTextNode("|"));
	    tmp = new DoLink(span, entryNumber+1, "suivante").doit();
	    if ( ctx.wsc != null && ctx.wsc.sel != null
		 && ctx.wsc.sel.contains(entryNumber+1) )
		tmp.setAttributeNS(null, "style", "opacity: 0.1");
	    span.appendChild(ctx.doc.createTextNode("]"));
	    beforeP.appendChild(ctx.doc.createTextNode("\u2001\u2193"));

	    span = ctx.doc.createElementNS(DamlEngine.XHTML_NS, "span");
	    afterP.appendChild(span);
	    LangHelper.setLangRec(span, "en");
	    span.appendChild(ctx.doc.createTextNode("\u2191Entry #"+entryNumberStr));
	    span.appendChild(ctx.doc.createTextNode(" ["));
	    tmp = new DoLink(span, entryNumber-1, "older").doit();
	    if ( ctx.wsc != null && ctx.wsc.sel != null
		 && ctx.wsc.sel.contains(entryNumber-1) )
		tmp.setAttributeNS(null, "style", "opacity: 0.1");
	    span.appendChild(ctx.doc.createTextNode("|"));
	    tmp = new DoLink(span, entryNumber, "\u203b").doit();
	    tmp.setAttributeNS(null, "title", "(Jump to top of entry)");
	    span.appendChild(ctx.doc.createTextNode(" "));
	    new DoLink(span, entryNumber, "permalink", true).doit();
	    span.appendChild(ctx.doc.createTextNode("|"));
	    new DoLink(span, entryNumber+1, "newer").doit();
	    span.appendChild(ctx.doc.createTextNode("]"));
	    afterP.appendChild(ctx.doc.createTextNode(" / "));
	    span = ctx.doc.createElementNS(DamlEngine.XHTML_NS, "span");
	    afterP.appendChild(span);
	    LangHelper.setLangRec(span, "fr");
	    span.appendChild(ctx.doc.createTextNode("\u2191Entr\u00e9e #"+entryNumberStr));
	    span.appendChild(ctx.doc.createTextNode(" ["));
	    tmp = new DoLink(span, entryNumber-1, "pr\u00e9c\u00e9dente").doit();
	    if ( ctx.wsc != null && ctx.wsc.sel != null
		 && ctx.wsc.sel.contains(entryNumber-1) )
		tmp.setAttributeNS(null, "style", "opacity: 0.1");
	    span.appendChild(ctx.doc.createTextNode("|"));
	    tmp = new DoLink(span, entryNumber, "\u203b").doit();
	    tmp.setAttributeNS(null, "title", "(Retourner du d\u00e9but de l'entr\u00e9e)");
	    span.appendChild(ctx.doc.createTextNode(" "));
	    new DoLink(span, entryNumber, "permalien", true).doit();
	    span.appendChild(ctx.doc.createTextNode("|"));
	    new DoLink(span, entryNumber+1, "suivante").doit();
	    span.appendChild(ctx.doc.createTextNode("]"));
	    afterP.appendChild(ctx.doc.createTextNode("\u2001\u2191"));
	}

	this.ownerDeque.registerAtStart(toProcess);

    }

}