var	RDB = require('./redis.js'),
	posts = require('./posts.js');




(function(Topics) {
	//data structure

	//*global:next_topic_id
	// *tid:1:title
	// *tid:1:uid
	// *tid:1:posts  (array of pid)
	// *tid:1:timestamp
	// *uid:1:topics
	// *topic:slug:how-to-eat-chicken:tid



	Topics.get_by_category = function(category, start, end) {

	}

	Topics.get = function(start, end) {
		if (start == null) start = 0;
		if (end == null) end = start + 10;


		RDB.lrange('topics:tid', start, end, function() {
			global.socket.emit
		});
	}


	Topics.post = function(title, content, category) {
		if (global.uid === null) {
			global.socket.emit('event:alert', {
				title: 'Thank you for posting',
				message: 'Since you are unregistered, your post is awaiting approval. Click here to register now.',
				type: 'warning',
				timeout: 7500,
				clickfn: function() {
					ajaxify.go('register');
				}
			});
			return; // for now, until anon code is written.
		}

		RDB.incr('global:next_topic_id', function(tid) {
			// Global Topics
			if (global.uid !== null) {
				RDB.lpush('topics:tid', tid);	
			} else {
				// need to add some unique key sent by client so we can update this with the real uid later
				RDB.lpush('topics:queued:tid', tid);		
			}
			


			if (category) {
				RDB.lpush('topics:' + category + ':tid', tid);
			}

			// Topic Info
			RDB.set('tid:' + tid + ':title', title);
			RDB.set('tid:' + tid + ':uid', global.uid);
			RDB.set('tid:' + tid + ':timestamp', new Date().getTime());
			
			RDB.set('topic:slug:' + tid + '/' + slugify(title) + ':tid', tid);

			// Posts
			posts.create(content, function(pid) {
				RDB.lpush('tid:' + tid + ':posts', pid);
			});

			// User Details - move this out later
			RDB.lpush('uid:' + uid + ':topics', tid);


			global.socket.emit('event:alert', {
				title: 'Thank you for posting',
				message: 'You have successfully posted. Click here to view your post.',
				type: 'notify',
				timeout: 2000
			});
		});

		
	};

}(exports));


//http://dense13.com/blog/2009/05/03/converting-string-to-slug-javascript/
function slugify(str) {
	str = str.replace(/^\s+|\s+$/g, ''); // trim
	str = str.toLowerCase();

	// remove accents, swap ñ for n, etc
	var from = "àáäâèéëêìíïîòóöôùúüûñç·/_,:;";
	var to   = "aaaaeeeeiiiioooouuuunc------";
	for (var i=0, l=from.length ; i<l ; i++) {
		str = str.replace(new RegExp(from.charAt(i), 'g'), to.charAt(i));
	}

	str = str.replace(/[^a-z0-9 -]/g, '') // remove invalid chars
			.replace(/\s+/g, '-') // collapse whitespace and replace by -
			.replace(/-+/g, '-'); // collapse dashes

	return str;
}