var topic_ctrl = require('./topic');

var config = require('../config').config;
var data2xml = require('data2xml');
var Markdown = require('node-markdown').Markdown;

exports.index = function (req,res,next) {
	if (!config.rss) {
		return res.send('Please set `rss` in config.js');
	}
	var opt = { limit: config.rss.max_rss_items, sort: [['create_at','desc']] };

	topic_ctrl.get_topics_by_query({}, opt, function (err, topics) {
		if(err) return next(err);

		var rss_obj = {
			_attr: { version: '2.0' },
			channel: {
				title: config.rss.title,
				link: config.rss.link,
				language: config.rss.language,
				description: config.rss.description,
				item: []
			},
		};

		topics.forEach(function (topic) {
			rss_obj.channel.item.push({
				title: topic.title,
				link: config.rss.link + '/topic/' + topic._id,
				guid: config.rss.link + '/topic/' + topic._id,
				description: Markdown(topic.content, true),
				author: topic.author.name,
				pubDate: topic.create_at.toUTCString()
			});
		});

		var rss_content = data2xml('rss', rss_obj);

		res.contentType('application/xml');
		res.send(rss_content);
	});
};