"use strict";

var	async = require('async'),
	nconf = require('nconf'),

	db = require('../database'),
	posts = require('../posts'),
	plugins = require('../plugins'),
	privileges = require('../privileges'),
	meta = require('../meta'),
	topics = require('../topics'),
	favourites = require('../favourites'),
	postTools = require('../postTools'),
	notifications = require('../notifications'),
	groups = require('../groups'),
	user = require('../user'),
	websockets = require('./index'),

	SocketPosts = {};


SocketPosts.reply = function(socket, data, callback) {
	if(!data || !data.tid || !data.content) {
		return callback(new Error('[[error:invalid-data]]'));
	}

	data.uid = socket.uid;
	data.req = websockets.reqFromSocket(socket);

	topics.reply(data, function(err, postData) {
		if (err) {
			return callback(err);
		}

		var result = {
			posts: [postData],
			privileges: {
				'topics:reply': true
			},
			'reputation:disabled': parseInt(meta.config['reputation:disabled'], 10) === 1,
			'downvote:disabled': parseInt(meta.config['downvote:disabled'], 10) === 1,
		};

		callback();

		socket.emit('event:new_post', result);

		var uids = websockets.getConnectedClients();

		privileges.categories.filterUids('read', postData.topic.cid, uids, function(err, uids) {
			if (err) {
				return;
			}

			plugins.fireHook('filter:sockets.sendNewPostToUids', {uidsTo: uids, uidFrom: data.uid, type: "newPost"}, function(err, data) {
				uids = data.uidsTo;

				for(var i=0; i<uids.length; ++i) {
					if (parseInt(uids[i], 10) !== socket.uid) {
						websockets.in('uid_' + uids[i]).emit('event:new_post', result);
					}
				}
			});
		});

		websockets.emitTopicPostStats();
	});
};

SocketPosts.upvote = function(socket, data, callback) {
	if (!data || !data.pid) {
		return callback(new Error('[[error:invalid-data]]'));
	}
	favouriteCommand('upvote', 'voted', socket, data, callback);
	SocketPosts.sendNotificationToPostOwner(data.pid, socket.uid, 'notifications:upvoted_your_post_in');
};

SocketPosts.downvote = function(socket, data, callback) {
	favouriteCommand('downvote', 'voted', socket, data, callback);
};

SocketPosts.unvote = function(socket, data, callback) {
	favouriteCommand('unvote', 'voted', socket, data, callback);
};

SocketPosts.favourite = function(socket, data, callback) {
	if (!data || !data.pid) {
		return callback(new Error('[[error:invalid-data]]'));
	}
	favouriteCommand('favourite', 'favourited', socket, data, callback);
	SocketPosts.sendNotificationToPostOwner(data.pid, socket.uid, 'notifications:favourited_your_post_in');
};

SocketPosts.unfavourite = function(socket, data, callback) {
	favouriteCommand('unfavourite', 'favourited', socket, data, callback);
};

function favouriteCommand(command, eventName, socket, data, callback) {
	if(!data || !data.pid || !data.room_id) {
		return;
	}
	async.parallel({
		exists: function(next) {
			posts.exists(data.pid, next);
		},
		deleted: function(next) {
			posts.getPostField(data.pid, 'deleted', next);
		}
	}, function(err, results) {
		if (err || !results.exists) {
			return callback(err);
		}

		if (parseInt(results.deleted, 10) === 1) {
			return callback(new Error('[[error:post-deleted]]'));
		}

		favourites[command](data.pid, socket.uid, function(err, result) {
			if (err) {
				return callback(err);
			}

			socket.emit('posts.' + command, result);

			if(data.room_id && result && eventName) {
				websockets.in(data.room_id).emit('event:' + eventName, result);
			}
			callback();
		});
	});
}

SocketPosts.sendNotificationToPostOwner = function(pid, fromuid, notification) {
	if(!pid || !fromuid) {
		return;
	}
	posts.getPostFields(pid, ['tid', 'uid', 'content'], function(err, postData) {
		if (err) {
			return;
		}

		if (!postData.uid || fromuid === parseInt(postData.uid, 10)) {
			return;
		}

		async.parallel({
			username: async.apply(user.getUserField, fromuid, 'username'),
			topicTitle: async.apply(topics.getTopicField, postData.tid, 'title'),
			postContent: async.apply(postTools.parse, postData.content)
		}, function(err, results) {
			if (err) {
				return;
			}

			notifications.create({
				bodyShort: '[[' + notification + ', ' + results.username + ', ' + results.topicTitle + ']]',
				bodyLong: results.postContent,
				pid: pid,
				nid: 'post:' + pid + ':uid:' + fromuid,
				from: fromuid
			}, function(err, notification) {
				if (!err && notification) {
					notifications.push(notification, [postData.uid]);
				}
			});
		});
	});
};

SocketPosts.getRawPost = function(socket, pid, callback) {
	async.waterfall([
		function(next) {
			privileges.posts.can('read', pid, socket.uid, next);
		},
		function(canRead, next) {
			if (!canRead) {
				return next(new Error('[[error:no-privileges]]'));
			}
			posts.getPostFields(pid, ['content', 'deleted'], next);
		},
		function(postData, next) {
			if (parseInt(postData.deleted, 10) === 1) {
				return next(new Error('[[error:no-post]]'));
			}
			next(null, postData.content);
		}
	], callback);
};

SocketPosts.edit = function(socket, data, callback) {
	if(!socket.uid) {
		return callback(new Error('[[error:not-logged-in]]'));
	} else if(!data || !data.pid || !data.title || !data.content) {
		return callback(new Error('[[error:invalid-data]]'));
	} else if (!data.title || data.title.length < parseInt(meta.config.minimumTitleLength, 10)) {
		return callback(new Error('[[error:title-too-short, ' + meta.config.minimumTitleLength + ']]'));
	} else if (data.title.length > parseInt(meta.config.maximumTitleLength, 10)) {
		return callback(new Error('[[error:title-too-long, ' + meta.config.maximumTitleLength + ']]'));
	} else if (!data.content || data.content.length < parseInt(meta.config.minimumPostLength, 10)) {
		return callback(new Error('[[error:content-too-short, ' + meta.config.minimumPostLength + ']]'));
	}

	postTools.edit(socket.uid, data.pid, data.title, data.content, {topic_thumb: data.topic_thumb, tags: data.tags}, function(err, results) {
		if(err) {
			return callback(err);
		}

		websockets.server.sockets.in('topic_' + results.topic.tid).emit('event:post_edited', {
			pid: data.pid,
			title: results.topic.title,
			isMainPost: results.topic.isMainPost,
			tags: results.topic.tags,
			content: results.content
		});

		callback();
	});
};

SocketPosts.delete = function(socket, data, callback) {
	deleteOrRestore('delete', socket, data, callback);
};

SocketPosts.restore = function(socket, data, callback) {
	deleteOrRestore('restore', socket, data, callback);
};

function deleteOrRestore(command, socket, data, callback) {
	if(!data) {
		return callback(new Error('[[error:invalid-data]]'));
	}

	postTools[command](socket.uid, data.pid, function(err, postData) {
		if(err) {
			return callback(err);
		}

		websockets.emitTopicPostStats();

		var eventName = command === 'restore' ? 'event:post_restored' : 'event:post_deleted';
		websockets.server.sockets.in('topic_' + data.tid).emit(eventName, postData);

		callback();
	});
}

SocketPosts.purge = function(socket, data, callback) {
	if(!data || !parseInt(data.pid, 10)) {
		return callback(new Error('[[error:invalid-data]]'));
	}
	postTools.purge(socket.uid, data.pid, function(err) {
		if(err) {
			return callback(err);
		}

		websockets.emitTopicPostStats();

		websockets.server.sockets.in('topic_' + data.tid).emit('event:post_purged', data.pid);

		callback();
	});
};

SocketPosts.getPrivileges = function(socket, pids, callback) {
	privileges.posts.get(pids, socket.uid, function(err, privileges) {
		if (err) {
			return callback(err);
		}
		if (!Array.isArray(privileges) || !privileges.length) {
			return callback(new Error('[[error:invalid-data]]'));
		}

		callback(null, privileges);
	});
};

SocketPosts.getUpvoters = function(socket, pid, callback) {
	favourites.getUpvotedUidsByPids([pid], function(err, data) {
		if (err || !Array.isArray(data) || !data.length) {
			return callback(err, []);
		}
		var otherCount = 0;
		if (data[0].length > 6) {
			otherCount = data[0].length - 5;
			data[0] = data[0].slice(0, 5);
		}
		user.getUsernamesByUids(data[0], function(err, usernames) {
			callback(err, {
				otherCount: otherCount,
				usernames: usernames
			});
		});
	});
};

SocketPosts.flag = function(socket, pid, callback) {
	if (!socket.uid) {
		return callback(new Error('[[error:not-logged-in]]'));
	}

	var message = '',
		userName = '',
		post;

	async.waterfall([
		function(next) {
			user.getUserFields(socket.uid, ['username', 'reputation'], next);
		},
		function(userData, next) {
			if (parseInt(userData.reputation, 10) < parseInt(meta.config['privileges:flag'] || 1, 10)) {
				return next(new Error('[[error:not-enough-reputation-to-flag]]'));
			}
			userName = userData.username;

			posts.getPostFields(pid, ['tid', 'uid', 'content', 'deleted'], next);
		},
		function(postData, next) {
			if (parseInt(postData.deleted) === 1) {
				return next(new Error('[[error:post-deleted]]'));
			}
			post = postData;
			topics.getTopicField(postData.tid, 'title', next);
		},
		function(topicTitle, next) {
			message = '[[notifications:user_flagged_post_in, ' + userName + ', ' + topicTitle + ']]';
			postTools.parse(post.content, next);
		},
		function(postContent, next) {
			post.content = postContent;
			groups.get('administrators', {}, next);
		},
		function(adminGroup, next) {
			notifications.create({
				bodyShort: message,
				bodyLong: post.content,
				pid: pid,
				nid: 'post_flag:' + pid + ':uid:' + socket.uid,
				from: socket.uid
			}, function(err, notification) {
				if (err || !notification) {
					return next(err);
				}
				notifications.push(notification, adminGroup.members, next);
			});
		},
		function(next) {
			posts.flag(pid, next);
		},
		function(next) {
			if (!parseInt(post.uid, 10)) {
				return next();
			}

			db.setAdd('uid:' + post.uid + ':flagged_by', socket.uid, function(err) {
				if (err) {
					return next(err);
				}
				db.setCount('uid:' + post.uid + ':flagged_by', function(err, count) {
					if (err) {
						return next(err);
					}

					if (count >= (meta.config.flagsForBan || 3) && parseInt(meta.config.flagsForBan, 10) !== 0) {
						var adminUser = require('./admin/user');
						adminUser.banUser(post.uid, next);
						return;
					}
					next();
				});
			});
		}
	], callback);
};

SocketPosts.loadMoreFavourites = function(socket, data, callback) {
	if(!data || !data.after) {
		return callback(new Error('[[error:invalid-data]]'));
	}

	var start = parseInt(data.after, 10),
		end = start + 9;

	posts.getFavourites(socket.uid, start, end, callback);
};

SocketPosts.loadMoreUserPosts = function(socket, data, callback) {
	if(!data || !data.after || !data.uid) {
		return callback(new Error('[[error:invalid-data]]'));
	}

	var start = parseInt(data.after, 10),
		end = start + 9;

	posts.getPostsByUid(socket.uid, data.uid, start, end, callback);
};


SocketPosts.getRecentPosts = function(socket, data, callback) {
	if(!data || !data.count) {
		return callback(new Error('[[error:invalid-data]]'));
	}

	posts.getRecentPosts(socket.uid, 0, data.count - 1, data.term, callback);
};

SocketPosts.getCategory = function(socket, pid, callback) {
	posts.getCidByPid(pid, callback);
};

SocketPosts.getPidIndex = function(socket, pid, callback) {
	posts.getPidIndex(pid, socket.uid, callback);
};

module.exports = SocketPosts;