#include <u.h>
#include <libc.h>
#include <bio.h>
#include "feed.h"
#include "xml.h"

static char rssdate[] = "?WWW, ?DD ?MM YYYY hh:mm:ss ?Z";

static void
freerss(Feed *f)
{
	xmlfree(f->aux);
}

Feed *
parserss(Biobuf *b)
{
	Xelem *x, *i;
	Item *item;
	Xattr *a;
	Feed *f;

	if((x = xmlread(b, 0)) == nil)
		return nil;
	if((f = calloc(1, sizeof(*f))) == nil){
		xmlfree(x);
		return nil;
	}

	f->aux = x;
	f->free = freerss;

	if((x = xmlget(x, "channel", nil)) == nil){
		werrstr("no channel");
		goto error;
	}

	for(i = x->ch; i != nil; i = i->next)
		f->nitems += strcmp(i->n, "item") == 0;
	if((f->items = calloc(f->nitems, sizeof(Item))) == nil)
		goto error;
	item = f->items - 1;
	for(i = x->ch; i != nil; i = i->next){
		if(strcmp(i->n, "link") == 0)                f->link = i->v;
		else if(strcmp(i->n, "title") == 0)          f->title = i->v;
		else if(strcmp(i->n, "description") == 0)    f->descr = i->v;
		else if(strcmp(i->n, "managingEditor") == 0) f->editor = i->v;
		else if(strcmp(i->n, "ttl") == 0)            f->ttl = atoi(i->v);
		else if(strcmp(i->n, "image") == 0)          f->image = (x = xmlget(i, "url", nil)) != nil ? x->v : nil;
		else if(strcmp(i->n, "item") == 0){
			item++;
			for(x = i->ch; x != nil; x = x->next){
				if(strcmp(x->n, "guid") == 0)             item->guid = x->v;
				else if(strcmp(x->n, "link") == 0)        item->link = x->v;
				else if(strcmp(x->n, "title") == 0)       item->title = x->v;
				else if(strcmp(x->n, "description") == 0) item->descr = x->v;
				else if(strcmp(x->n, "author") == 0)      item->author = x->v;
				else if(strcmp(x->n, "pubDate") == 0)     tmparse(&item->published, rssdate, x->v, tzone, nil);
				else if(strcmp(x->n, "enclosure") == 0){
					if((a = xmlgetattr(x->a, "url")) != nil){
						item->nencls++;
						item->encls = realloc(item->encls, item->nencls*sizeof(char*));
						item->encls[item->nencls-1] = a->v;
					}
				}
			}
		}
	}

	return f;
error:
	freerss(f);
	return nil;
}