"use strict";

var posts = require('../posts'),
	topics = require('../topics'),
	categories = require('../categories'),

	rss = require('rss'),
	nconf = require('nconf'),

	ThreadTools = require('../threadTools'),
	CategoryTools = require('../categoryTools');

function hasTopicPrivileges(req, res, next) {
	var tid = req.params.topic_id;
	var uid = req.user ? req.user.uid || 0 : 0;

	ThreadTools.privileges(tid, uid, function(err, privileges) {
		if(err) {
			return next(err);
		}

		if(!privileges.read) {
			return res.redirect('403');
		}

		return next();
	});
}

function hasCategoryPrivileges(req, res, next) {
	var cid = req.params.category_id;
	var uid = req.user ? req.user.uid || 0 : 0;

	CategoryTools.privileges(cid, uid, function(err, privileges) {
		if(err) {
			return next(err);
		}

		if(!privileges.read) {
			return res.redirect('403');
		}

		return next();
	});
}


function generateForTopic(req, res, next) {
	var tid = req.params.topic_id;

	topics.getTopicWithPosts(tid, 0, 0, 25, function (err, topicData) {
		if (err) {
			return next(err);
		}

		var description = topicData.posts.length ? topicData.posts[0].content : '';
		var image_url = topicData.posts.length ? topicData.posts[0].picture : '';
		var author = topicData.posts.length ? topicData.posts[0].username : '';

		var feed = new rss({
				title: topicData.title,
				description: description,
				feed_url: nconf.get('url') + '/topic/' + tid + '.rss',
				site_url: nconf.get('url') + '/topic/' + topicData.slug,
				image_url: image_url,
				author: author,
				ttl: 60
			}),
			dateStamp;

		// Add pubDate if topic contains posts
		if (topicData.posts.length > 0) {
			feed.pubDate = new Date(parseInt(topicData.posts[0].timestamp, 10)).toUTCString();
		}

		topicData.posts.forEach(function(postData) {
			if (parseInt(postData.deleted, 10) === 0) {
				dateStamp = new Date(parseInt(parseInt(postData.edited, 10) === 0 ? postData.timestamp : postData.edited, 10)).toUTCString();

				feed.item({
					title: 'Reply to ' + topicData.title + ' on ' + dateStamp,
					description: postData.content,
					url: nconf.get('url') + '/topic/' + topicData.slug + '#' + postData.pid,
					author: postData.username,
					date: dateStamp
				});
			}
		});

		var xml = feed.xml();
		res.type('xml').set('Content-Length', Buffer.byteLength(xml)).send(xml);
	});

}

function generateForCategory(req, res, next) {
	var cid = req.params.category_id;

	categories.getCategoryById(cid, 0, 25, 0, function (err, categoryData) {
		if (err) {
			return next(err);
		}

		var feed = new rss({
				title: categoryData.name,
				description: categoryData.description,
				feed_url: nconf.get('url') + '/category/' + cid + '.rss',
				site_url: nconf.get('url') + '/category/' + categoryData.cid,
				ttl: 60
			});

		// Add pubDate if category has topics
		if (categoryData.topics.length > 0) {
			feed.pubDate = new Date(parseInt(categoryData.topics[0].lastposttime, 10)).toUTCString();
		}

		categoryData.topics.forEach(function(topicData) {
			feed.item({
				title: topicData.title,
				url: nconf.get('url') + '/topic/' + topicData.slug,
				author: topicData.username,
				date: new Date(parseInt(topicData.lastposttime, 10)).toUTCString()
			});
		});

		var xml = feed.xml();
		res.type('xml').set('Content-Length', Buffer.byteLength(xml)).send(xml);
	});
}

function generateForRecent(req, res, next) {
	topics.getLatestTopics(0, 0, 19, 'month', function (err, recentData) {
		if(err){
			return next(err);
		}

		var	feed = new rss({
				title: 'Recently Active Topics',
				description: 'A list of topics that have been active within the past 24 hours',
				feed_url: nconf.get('url') + '/recent.rss',
				site_url: nconf.get('url') + '/recent',
				ttl: 60
			});

		// Add pubDate if recent topics list contains topics
		if (recentData.topics.length > 0) {
			feed.pubDate = new Date(parseInt(recentData.topics[0].lastposttime, 10)).toUTCString();
		}

		recentData.topics.forEach(function(topicData) {
			feed.item({
				title: topicData.title,
				url: nconf.get('url') + '/topic/' + topicData.slug,
				author: topicData.username,
				date: new Date(parseInt(topicData.lastposttime, 10)).toUTCString()
			});
		});

		var xml = feed.xml();
		res.type('xml').set('Content-Length', Buffer.byteLength(xml)).send(xml);
	});
}

function generateForPopular(req, res, next) {
	topics.getTopicsFromSet(0, 'topics:posts', 0, 19, function (err, popularData) {
		if(err){
			return next(err);
		}

		var	feed = new rss({
				title: 'Popular Topics',
				description: 'A list of topics that are sorted by post count',
				feed_url: nconf.get('url') + '/popular.rss',
				site_url: nconf.get('url') + '/popular',
				ttl: 60
			});

		// Add pubDate if recent topics list contains topics
		if (popularData.topics.length > 0) {
			feed.pubDate = new Date(parseInt(popularData.topics[0].lastposttime, 10)).toUTCString();
		}

		popularData.topics.forEach(function(topicData) {
			feed.item({
				title: topicData.title,
				url: nconf.get('url') + '/topic/' + topicData.slug,
				author: topicData.username,
				date: new Date(parseInt(topicData.lastposttime, 10)).toUTCString()
			});
		});

		var xml = feed.xml();
		res.type('xml').set('Content-Length', Buffer.byteLength(xml)).send(xml);
	});
}

module.exports = function(app, middleware, controllers){
	app.get('/topic/:topic_id.rss', hasTopicPrivileges, generateForTopic);
	app.get('/category/:category_id.rss', hasCategoryPrivileges, generateForCategory);
	app.get('/recent.rss', generateForRecent);
	app.get('/popular.rss', generateForPopular);
};