var	RDB = require('./redis.js'),
	posts = require('./posts.js'),
	utils = require('./utils.js'),
	user = require('./user.js'),
	configs = require('../config.js'),
	categories = require('./categories.js'),
	marked = require('marked'),
	async = require('async');

marked.setOptions({
	breaks: true
});

(function(Topics) {

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

	}


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

		//build a proper wrapper for this and move it into above function later
		var range_var = (category_id) ? 'categories:' + category_id + ':tid'  : 'topics:tid';

		RDB.smembers(range_var, function(err, tids) {
	

			var title = [],
				uid = [],
				timestamp = [],
				slug = [],
				postcount = [],
				locked = [],
				deleted = [],
				pinned = [];

			for (var i=0, ii=tids.length; i<ii; i++) {
				title.push('tid:' + tids[i] + ':title');
				uid.push('tid:' + tids[i] + ':uid');
				timestamp.push('tid:' + tids[i] + ':timestamp');
				slug.push('tid:' + tids[i] + ':slug');
				postcount.push('tid:' + tids[i] + ':postcount');
				locked.push('tid:' + tids[i] + ':locked');
				deleted.push('tid:' + tids[i] + ':deleted');
				pinned.push('tid:' + tids[i] + ':pinned');
			}

			var multi = RDB.multi()
				.get('cid:' + category_id + ':name')
				.smembers('cid:' + category_id + ':active_users');

			if (tids.length > 0) {
				multi
					.mget(title)
					.mget(uid)
					.mget(timestamp)
					.mget(slug)
					.mget(postcount)
					.mget(locked)
					.mget(deleted)
					.mget(pinned)
			}
				
			
			multi.exec(function(err, replies) {
				category_name = replies[0];

				if(category_id && category_name === null) {
					callback(false);
					return;
				}
				active_usernames = replies[1];
				var topics = [];

				title = replies[2];
				uid = replies[3];
				timestamp = replies[4];
				slug = replies[5];
				postcount = replies[6];
				locked = replies[7];
				deleted = replies[8];
				pinned = replies[9];

				var usernames,
					has_read,
					moderators,
					teaser_info;

				function generate_topic() {
					if (!usernames || !has_read || !moderators || !teaser_info) return;

					if (tids.length > 0) {
						for (var i=0, ii=title.length; i<ii; i++) {
							topics.push({
								'title' : title[i],
								'uid' : uid[i],
								'username': usernames[i],
								'timestamp' : timestamp[i],
								'relativeTime': utils.relativeTime(timestamp[i]),
								'slug' : slug[i],
								'post_count' : postcount[i],
								'lock-icon': locked[i] === '1' ? 'icon-lock' : 'none',
								'deleted': deleted[i],
								'pinned': parseInt(pinned[i] || 0),	// For sorting purposes
								'pin-icon': pinned[i] === '1' ? 'icon-pushpin' : 'none',
								'badgeclass' : (has_read[i] && current_user !=0) ? '' : 'badge-important',
								'teaser_text': teaser_info[i].text,
								'teaser_username': teaser_info[i].username
							});
						}
					}

					// Float pinned topics to the top
					topics = topics.sort(function(a, b) {
						if (a.pinned !== b.pinned) return b.pinned - a.pinned;
						else {
							// Sort by datetime descending
							return b.timestamp - a.timestamp;
						}
					});

					var active_users = [];
					for (var username in active_usernames) {
						active_users.push({'username': active_usernames[username]});
					}

					callback({
						'category_name' : category_id ? category_name : 'Recent',
						'show_topic_button' : category_id ? 'show' : 'hidden',
						'category_id': category_id || 0,
						'topics': topics,
						'active_users': active_users,
						'moderator_block_class': moderators.length > 0 ? '' : 'none',
						'moderators': moderators
					});
				}
				
				user.get_usernames_by_uids(uid, function(userNames) {
					usernames = userNames;
					generate_topic();
				});	

				Topics.hasReadTopics(tids, current_user, function(hasRead) {
					has_read = hasRead;
					generate_topic();
				});

				categories.getModerators(category_id, function(mods) {
					moderators = mods;
					generate_topic();
				});

				Topics.get_teasers(tids, function(teasers) {
					teaser_info = teasers;
					generate_topic();
				});
				// else {
				// 	callback({
				// 		'category_name' : category_id ? category_name : 'Recent',
				// 		'show_topic_button' : category_id ? 'show' : 'hidden',
				// 		'category_id': category_id || 0,
				// 		'topics': []
				// 	});
				// }
			});
		});
	}

	Topics.get_topic = function(tid, uid, callback) {
		var topicData = {};

		async.parallel([
			function(next) {
				RDB.mget([
					'tid:' + tid + ':title',
					'tid:' + tid + ':uid',
					'tid:' + tid + ':timestamp',
					'tid:' + tid + ':slug',
					'tid:' + tid + ':postcount',
					'tid:' + tid + ':locked',
					'tid:' + tid + ':pinned',
					'tid:' + tid + ':deleted'
				], function(err, topic) {
					topicData.title = topic[0];
					topicData.uid = topic[1];
					topicData.timestamp = topic[2];
					topicData.relativeTime = utils.relativeTime(topic[2]),
					topicData.slug = topic[3];
					topicData.post_count = topic[4];
					topicData.locked = topic[5];
					topicData.pinned = topic[6];
					topicData.deleted = topic[7];

					user.getUserField(topic[1], 'username', function(username) {
						topicData.username = username;
						next(null);
					})
				});
			},
			function(next) {
				if (uid && parseInt(uid) > 0) {
					RDB.sismember('tid:' + tid + ':read_by_uid', uid, function(err, read) {
						topicData.badgeclass = read ? '' : 'badge-important';
						next(null);
					});
				} else next(null);
			},
			function(next) {
				Topics.get_teaser(tid, function(teaser) {
					topicData.teaser_text = teaser.text;
					topicData.teaser_username = teaser.username;
					next(null);
				});
			}
		], function(err) {
			if (!err) {
				callback(topicData);
			}
		});
	}

	Topics.get_cid_by_tid = function(tid, callback) {
		RDB.get('tid:' + pid + ':cid', function(err, cid) {
			if (cid && parseInt(cid) > 0) callback(cid);
			else callback(false);
		});
	}

	Topics.markAsRead = function(tid, uid) {
		RDB.sadd('tid:' + tid + ':read_by_uid', uid);
	}

	Topics.hasReadTopics = function(tids, uid, callback) {
		var batch = RDB.multi();

		for (var i=0, ii=tids.length; i<ii; i++) {
			batch.sismember('tid:' + tids[i] + ':read_by_uid', uid);	
		}
		
		batch.exec(function(err, hasRead) {
			callback(hasRead);
		});
	}

	Topics.get_teasers = function(tids, callback) {
		var	requests = [];
		if (Array.isArray(tids)) {
			for(x=0,numTids=tids.length;x<numTids;x++) {
				(function(x) {
					requests.push(function(next) {
						Topics.get_teaser(tids[x], function(teaser_info) {
							next(null, teaser_info);
						});
					});
				})(x);
			}
			async.parallel(requests, function(err, teasers) {
				callback(teasers);
			});
		} else callback([]);
	}

	Topics.get_teaser = function(tid, callback) {
		RDB.lrange('tid:' + tid + ':posts', -1, -1, function(err, pid) {
			if (pid !== null) {
				RDB.mget([
					'pid:' + pid + ':content',
					'pid:' + pid + ':uid'
				], function(err, content) {
					user.getUserField(content[1], 'username', function(username) {
						callback({
							"text": utils.strip_tags(marked(content[0])),
							"username": username
						});
					});
				});
			}
		});
	}

	Topics.post = function(socket, uid, title, content, category_id) {
		if (!category_id) throw new Error('Attempted to post without a category_id');
		
		if (uid === 0) {
			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(err, tid) {
			RDB.handle(err);

			// Global Topics
			if (uid == null) uid = 0;
			if (uid !== null) {
				RDB.sadd('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);
			}

			var slug = tid + '/' + utils.slugify(title);

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

			// Posts
			posts.create(uid, tid, content, function(pid) {
				if (pid > 0) {
					RDB.lpush('tid:' + tid + ':posts', pid);

					// Notify any users looking at the category that a new post has arrived
					Topics.get_topic(tid, uid, function(topicData) {
						io.sockets.in('category_' + category_id).emit('event:new_topic', topicData);
					});
				}
			});

			Topics.markAsRead(tid, uid);

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

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

			// in future it may be possible to add topics to several categories, so leaving the door open here.
			RDB.sadd('categories:' + category_id + ':tid', tid);
			RDB.set('tid:' + tid + ':cid', category_id);
			categories.get_category([category_id], function(data) {
				RDB.set('tid:' + tid + ':category_name', data.categories[0].name);
				RDB.set('tid:' + tid + ':category_slug', data.categories[0].slug);
			});

		});
	};

	Topics.lock = function(tid, uid, socket) {
		user.getUserField(uid, 'reputation', function(rep) {
			if (rep >= configs.privilege_thresholds.manage_thread) {
				// Mark thread as locked
				RDB.set('tid:' + tid + ':locked', 1);

				if (socket) {
					io.sockets.in('topic_' + tid).emit('event:topic_locked', {
						tid: tid,
						status: 'ok'
					});
				}
			}
		});
	}

	Topics.unlock = function(tid, uid, socket) {
		user.getUserField(uid, 'reputation', function(rep) {
			if (rep >= configs.privilege_thresholds.manage_thread) {
				// Mark thread as locked
				RDB.del('tid:' + tid + ':locked');

				if (socket) {
					io.sockets.in('topic_' + tid).emit('event:topic_unlocked', {
						tid: tid,
						status: 'ok'
					});
				}
			}
		});
	}

	Topics.delete = function(tid, uid, socket) {
		user.getUserField(uid, 'reputation', function(rep) {
			if (rep >= configs.privilege_thresholds.manage_thread) {
				// Mark thread as deleted
				RDB.set('tid:' + tid + ':deleted', 1);
				Topics.lock(tid, uid);

				if (socket) {
					io.sockets.in('topic_' + tid).emit('event:topic_deleted', {
						tid: tid,
						status: 'ok'
					});
				}
			}
		});
	}

	Topics.restore = function(tid, uid, socket) {
		user.getUserField(uid, 'reputation', function(rep) {
			if (rep >= configs.privilege_thresholds.manage_thread) {
				// Mark thread as deleted
				RDB.del('tid:' + tid + ':deleted');
				Topics.unlock(tid, uid);

				if (socket) {
					io.sockets.in('topic_' + tid).emit('event:topic_restored', {
						tid: tid,
						status: 'ok'
					});
				}
			}
		});
	}

	Topics.pin = function(tid, uid, socket) {
		user.getUserField(uid, 'reputation', function(rep) {
			if (rep >= configs.privilege_thresholds.manage_thread) {
				// Mark thread as deleted
				RDB.set('tid:' + tid + ':pinned', 1);

				if (socket) {
					io.sockets.in('topic_' + tid).emit('event:topic_pinned', {
						tid: tid,
						status: 'ok'
					});
				}
			}
		});
	}

	Topics.unpin = function(tid, uid, socket) {
		user.getUserField(uid, 'reputation', function(rep) {
			if (rep >= configs.privilege_thresholds.manage_thread) {
				// Mark thread as deleted
				RDB.del('tid:' + tid + ':pinned');

				if (socket) {
					io.sockets.in('topic_' + tid).emit('event:topic_unpinned', {
						tid: tid,
						status: 'ok'
					});
				}
			}
		});
	}

	Topics.move = function(tid, cid, socket) {
		RDB.get('tid:' + tid + ':cid', function(err, oldCid) {
			RDB.handle(err);

			RDB.smove('categories:' + oldCid + ':tid', 'categories:' + cid + ':tid', tid, function(err, result) {
				if (!err && result === 1) {
					RDB.set('tid:' + tid + ':cid', cid);
					categories.get_category([cid], function(data) {
						RDB.set('tid:' + tid + ':category_name', data.categories[0].name);
						RDB.set('tid:' + tid + ':category_slug', data.categories[0].slug);
					});
					socket.emit('api:topic.move', { status: 'ok' });
					io.sockets.in('topic_' + tid).emit('event:topic_moved', { tid: tid });
				} else {
					socket.emit('api:topic.move', { status: 'error' });
				}
			});
		});
	}
}(exports));