var	RDB = require('./redis.js'),
	utils = require('./../public/src/utils.js'),
	schema = require('./schema.js'),
	marked = require('marked'),
	user = require('./user.js'),
	topics = require('./topics.js'),
	favourites = require('./favourites.js'),
	threadTools = require('./threadTools.js'),
	feed = require('./feed.js'),
	async = require('async');

marked.setOptions({
	breaks: true
});

(function(Posts) {

	Posts.minimumPostLength = 8;

	Posts.getPostsByTid = function(tid, start, end, callback) {
		RDB.lrange('tid:' + tid + ':posts', start, end, function(err, pids) {
			
			RDB.handle(err);

			if (pids.length) {
				Posts.getPostsByPids(pids, function(posts) {
					callback(posts);
				});
			} else {
				callback({
					error: 'no-posts'
				});
			}
		});
	}
	
	Posts.addUserInfoToPost = function(post, callback) {
		user.getUserFields(post.uid, ['username', 'userslug', 'reputation', 'postcount', 'picture', 'signature'], function(userData) {

			post.username = userData.username || 'anonymous';
			post.userslug = userData.userslug || '';
			post.user_rep = userData.reputation || 0;
			post.user_postcount = userData.postcount || 0;
			post.picture = userData.picture || require('gravatar').url('', {}, https=global.nconf.get('https'));
			post.signature = marked(userData.signature || '');

			if(post.editor !== '') {
				user.getUserFields(post.editor, ['username', 'userslug'], function(editorData) {
					post.editorname = editorData.username;
					post.editorslug = editorData.userslug;	
					callback();
				});
			} else {
				callback();
			}
		});
	}

	Posts.getPostSummaryByPids = function(pids, callback) {
		
		var returnData = [];
		
		function getPostSummary(pid, callback) {
			Posts.getPostFields(pid, ['pid', 'content', 'uid', 'timestamp', 'deleted'], function(postData) {
				Posts.addUserInfoToPost(postData, function() {

					if(postData.deleted !== '1')	{
						returnData.push(postData);
					}
					
					callback(null);
				});
			});
		}
		
		async.eachSeries(pids, getPostSummary, function(err) {
			if(!err) {
				callback(returnData);
			}
		});
	};

	Posts.getPostData = function(pid, callback) {
		RDB.hgetall('post:' + pid, function(err, data) {
			if(err === null) 
				callback(data);
			else
				console.log(err);
		});
	}

	Posts.getPostFields = function(uid, fields, callback) {
		RDB.hmget('post:' + uid, fields, function(err, data) {
			if(err === null) {
				var returnData = {};
				
				for(var i=0, ii=fields.length; i<ii; ++i) {
					returnData[fields[i]] = data[i];
				}

				callback(returnData);
			}
			else
				console.log(err);
		});		
	}

	Posts.getPostsByPids = function(pids, callback) {
		var posts = [], 
			loaded = 0;

		for(var i=0, ii=pids.length; i<ii; ++i) {
			(function(index, pid) {
				Posts.getPostData(pid, function(postData) {
				
					if(postData) {
						postData.relativeTime = utils.relativeTime(postData.timestamp);	
						postData.post_rep = postData.reputation;
						postData['edited-class'] = postData.editor !== '' ? '' : 'none';
						postData['relativeEditTime'] = postData.edited !== '0' ? utils.relativeTime(postData.edited) : '';
						postData.content = marked(postData.content || '');
						posts[index] = postData;
					}
					
					++loaded;
					if(loaded === pids.length)
						callback(posts);
				});
			}(i, pids[i]));
		}
	}

	Posts.getPostField = function(pid, field, callback) {
		RDB.hget('post:' + pid, field, function(err, data) {
			if(err === null)
				callback(data);
			else
				console.log(err);
		});
	}

	Posts.setPostField = function(pid, field, value) {
		RDB.hset('post:' + pid, field, value);
	}

	Posts.getPostFields = function(pid, fields, callback) {
		RDB.hmget('post:' + pid, fields, function(err, data) {
			if(err === null) {
				var returnData = {};
				
				for(var i=0, ii=fields.length; i<ii; ++i) {
					returnData[fields[i]] = data[i];
				}

				callback(returnData);
			}
			else
				console.log(err);
		});		
	}

	Posts.get_cid_by_pid = function(pid, callback) {
		Posts.getPostField(pid, 'tid', function(tid) {
			if (tid) {
				topics.getTopicField(tid, 'cid', function(cid) {
					if (cid) {
						callback(cid);
					} else {
						callback(false);
					}
				});
			}
		});
	}

	Posts.emitContentTooShortAlert = function(socket) {
		socket.emit('event:alert', {
			type: 'error',
			timeout: 2000,
			title: 'Content too short',
			message: "Please enter a longer post.",
			alert_id: 'post_error'
		});
	}

	Posts.reply = function(socket, tid, uid, content) {
		if (uid < 1) {
			socket.emit('event:alert', {
				title: 'Reply Unsuccessful',
				message: 'You don&apos;t seem to be logged in, so you cannot reply.',
				type: 'error',
				timeout: 2000
			});
			return;
		} else if (!content || content.length < Posts.minimumPostLength) {
			Posts.emitContentTooShortAlert(socket);
			return;
		}

		user.getUserField(uid, 'lastposttime', function(lastposttime) {

			if(Date.now() - lastposttime < config.post_delay) {
				socket.emit('event:alert', {
					title: 'Too many posts!',
					message: 'You can only post every '+ (config.post_delay / 1000) + ' seconds.',
					type: 'error',
					timeout: 2000
				});
				return;
			}

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

					RDB.del('tid:' + tid + ':read_by_uid'); 

					Posts.get_cid_by_pid(pid, function(cid) {
						RDB.del('cid:' + cid + ':read_by_uid', function(err, data) {
							topics.markAsRead(tid, uid);	
						});
					});

					Posts.getTopicPostStats(socket);

					// Send notifications to users who are following this topic
					threadTools.notify_followers(tid, uid);

					
					socket.emit('event:alert', {
						title: 'Reply Successful',
						message: 'You have successfully replied. Click here to view your reply.',
						type: 'notify',
						timeout: 2000
					});


					var timestamp = Date.now();
					var socketData = {
						'posts' : [
							{
								'pid' : pid,
								'content' : marked(content || ''),
								'uid' : uid,
								'post_rep' : 0,
								'timestamp' : timestamp,
								'relativeTime': utils.relativeTime(timestamp),
								'fav_star_class' :'icon-star-empty',
								'edited-class': 'none',
								'editor': '',
							}
						]
					};
						
					posts.addUserInfoToPost(socketData['posts'][0], function() {
						io.sockets.in('topic_' + tid).emit('event:new_post', socketData);
						io.sockets.in('recent_posts').emit('event:new_post', socketData);
					});					
				
				} else {
					socket.emit('event:alert', {
						title: 'Reply Unsuccessful',
						message: 'Your reply could not be posted at this time. Please try again later.',
						type: 'notify',
						timeout: 2000
					});
				}
			});
		});
	};

	Posts.create = function(uid, tid, content, callback) {
		if (uid === null) {
			callback(-1);
			return;
		}
		
		topics.isLocked(tid, function(locked) {

			if (!locked || locked === '0') {
				RDB.incr('global:next_post_id', function(err, pid) {
					RDB.handle(err);
					
					var timestamp = Date.now();
					
					RDB.hmset('post:' + pid, {
						'pid': pid,
						'uid': uid,
						'tid': tid,
						'content': content,
						'timestamp': timestamp,
						'reputation': 0,
						'editor': '',
						'edited': 0,
						'deleted': 0
					});

					topics.increasePostCount(tid);
					topics.setTopicField(tid, 'lastposttime', timestamp);
					topics.addToRecent(tid, timestamp);

					RDB.incr('totalpostcount');
						
					topics.getTopicField(tid, 'cid', function(cid) {
						RDB.handle(err);

						feed.updateTopic(tid, cid);

						RDB.zadd('categories:recent_posts:cid:' + cid, Date.now(), pid);

						// this is a bit of a naive implementation, defn something to look at post-MVP
						RDB.scard('cid:' + cid + ':active_users', function(amount) {
							if (amount > 10) {
								RDB.spop('cid:' + cid + ':active_users');
							}

							RDB.sadd('cid:' + cid + ':active_users', uid);
						});
					});
					
					
					
					user.onNewPostMade(uid, tid, pid, timestamp);					

					if (callback) 
						callback(pid);
				});
			} else {
				callback(-1);
			}
		});
	}
	
	Posts.getPostsByUid = function(uid, start, end, callback) {
		
		user.getPostIds(uid, start, end, function(pids) {
			
			if(pids && pids.length) {
			
				Posts.getPostsByPids(pids, function(posts) {
					callback(posts);
				});
			}
			else
				callback([]);
		});				
	}

	Posts.getTopicPostStats = function(socket) {
		RDB.mget(['totaltopiccount', 'totalpostcount'], function(err, data) {
			if(err === null) {
				var stats = {
					topics: data[0]?data[0]:0,
					posts: data[1]?data[1]:0				
				};
				
				socket.emit('post.stats', stats);
			}				
			else
				console.log(err);
		});
	}

}(exports));