'use strict';

var async = require('async'),

	db =  require('./database'),
	batch = require('./batch'),
	user = require('./user'),
	utils = require('../public/src/utils');


(function(events) {
	events.log = function(data, callback) {
		callback = callback || function() {};

		async.waterfall([
			function(next) {
				db.incrObjectField('global', 'nextEid', next);
			},
			function(eid, next) {
				data.timestamp = Date.now();
				data.eid = eid;

				async.parallel([
					function(next) {
						db.sortedSetAdd('events:time', data.timestamp, eid, next);
					},
					function(next) {
						db.setObject('event:' + eid, data, next);
					}
				], next);
			}
		], function(err, result) {
			callback(err);
		});
	};

	events.getEvents = function(start, stop, callback) {
		async.waterfall([
			function(next) {
				db.getSortedSetRevRange('events:time', start, stop, next);
			},
			function(eids, next) {
				var keys = eids.map(function(eid) {
					return 'event:' + eid;
				});
				db.getObjects(keys, next);
			},
			function(eventsData, next) {
				eventsData.forEach(function(event) {
					var e = utils.merge(event);
					e.eid = e.uid = e.type = e.ip = undefined;
					event.jsonString = JSON.stringify(e, null, 4);
					event.timestampISO = new Date(parseInt(event.timestamp, 10)).toUTCString();
				});
				addUserData(eventsData, 'uid', 'user', next);
			},
			function(eventsData, next) {
				addUserData(eventsData, 'targetUid', 'targetUser', next);
			}
		], callback);
	};

	function addUserData(eventsData, field, objectName, callback) {
		var uids = eventsData.map(function(event) {
			return event && event[field];
		}).filter(function(uid, index, array) {
			return uid && array.indexOf(uid) === index;
		});

		if (!uids.length) {
			return callback(null, eventsData);
		}

		async.parallel({
			isAdmin: function(next) {
				user.isAdministrator(uids, next);
			},
			userData: function(next) {
				user.getMultipleUserFields(uids, ['username', 'userslug', 'picture'], next);
			}
		}, function(err, results) {
			if (err) {
				return callback(err);
			}

			var userData = results.userData;

			var map = {};
			userData.forEach(function(user, index) {
				user.isAdmin = results.isAdmin[index];
				map[user.uid] = user;
			});

			eventsData.forEach(function(event) {
				if (map[event[field]]) {
					event[objectName] = map[event[field]];
				}
			});
			callback(null, eventsData);
		});
	}

	events.deleteEvents = function(eids, callback) {
		callback = callback || function() {};
		async.parallel([
			function(next) {
				var keys = eids.map(function(eid) {
					return 'event:' + eid;
				});
				db.deleteAll(keys, next);
			},
			function(next) {
				db.sortedSetRemove('events:time', eids, next);
			}
		], callback);
	};

	events.deleteAll = function(callback) {
		callback = callback || function() {};

		batch.processSortedSet('events:time', function(eids, next) {
			events.deleteEvents(eids, callback);
		}, {alwaysStartAt: 0}, callback);
	};


}(module.exports));