var express = require('express');
var Event = require('./event.model');
var debug = require('debug')('eventapi');
var communicator = require('../../communicator');

var getRandomString = function(){
    return require('crypto').randomBytes(16).toString('hex');
}

exports.verifyEmail = function(req, res, next){
    var id = req.params.id,
        code = req.params.code;
    Event.update({
            '_id' : id,
            '__private.verificationCode' : code
        }, {
            'creator.isVerified' : true ,
            '__private.verificationCode' : getRandomString()
        }, function(err, num){
        if (err) return handleError(res, err);
        if (num == 0) return res.status(498).end();
        next();
    });
}

exports.create = function(req, res, next){
    var event = req.body;
    event.__private = {
        'verificationCode' : getRandomString(),
        'deleteCode' : getRandomString()
    }
    Event.create(req.body, function(err, event){
        if (err) return handleError(res, err);
        if (!event) return res.status(404);
        communicator.emit('event:create', event);
        req.event = event;
        next();
    });
}

exports.show = function(req, res, next){
    Event.findById(req.params.id, function(err, event){
        if (err) return handleError(res, err);
        if (!event) return res.status(404).end();
        req.event = event;
        next();
    });
}

exports.update = function(req, res){
    var updatedEvent = req.body;
    updatedEvent.updated = Date.now();
    Event.findById(req.params.id, function(err, event){
        if (err) return handleError(res, err);
        if (!event) return res.status(404).end();
        // If the creator's email has changed OR the notifications setting has changed - start a new email confirmation transaction
        if (event.creator.email != updatedEvent.creator.email ||
            (!event.creator.allowNotifications && updatedEvent.creator.allowNotifications)) {
                updatedEvent.creator.isVerified = false;
                updatedEvent.creator.allowNotifications = true;
                updatedEvent.__private = event.__private;
                communicator.emit('event:update:creator.email', updatedEvent, event);
        }
        Event.update({ '_id' : req.params.id }, updatedEvent, function(){
            communicator.emit('event:update', updatedEvent, event);
            return res.status(204).end();
        });
    });
}

exports.delete = function(req, res, next){
    var eventId = req.params.id,
        code = req.params.code;
    if (code){
        Event.update({
            '_id' : eventId,
            '__private.deleteCode' : code
        }, {
            'isDeleted' : true ,
            '__private.deleteCode' : getRandomString()
        }, function(err, num){
            if (err) return handleError(res, err);
            if (num == 0) return res.status(498).end();
            next();
        });
    } else {
        Event.findById(eventId, function(err, event){
            if (err) return handleError(res, err);
            if (!event) return res.status(404).end();
            communicator.emit('event:delete', event);
            next();
        });
    }
}

exports.createComment = function(req, res, next){
    var eventId = req.params.id,
        comment = req.body;
    Event.findById(eventId, function(err, event){
        if (err) return handleError(res, err);
        event.comments.push(comment);
        event.save(function(err, event){
            if (err) return next(err);
            req.event = event;
            next();
        });
    });
}

exports.deleteComment = function(req, res, next){
    var eventId = req.params.id,
        commentId = req.params.cid;
    Event.findById(eventId, function(err, event){
        if (err) return handleError(res, err);
        event.comments.pull({ '_id' : commentId });
        event.save(function(err, event){
            req.event = event;
            next();
        })
    });
}


exports.createParticipant = function(req, res, next){
    var eventId = req.params.id,
        participant = req.body;
    Event.findById(eventId, function(err, event){
        if (err) return handleError(res, err);
        event.updated = Date.now();
        event.participants.push(participant);
        event.save(function(err, event){
            if (err) return next(err);
            req.event = event;
            next();
        });
    });
}

exports.updateParticipant = function(req, res, next){
    var eventId = req.params.id,
        participantId = req.params.pid;
    Event.update({
        '_id' : eventId,
        'participants._id': participantId
    }, {
        '$set': {
            'updated' : Date.now(),
            'participants.$' : req.body
        }
    }, function(err, num){
        if (err) return handleError(res, err);
        res.status(204).end();
    });
}

exports.deleteParticipant = function(req, res, next){
    var eventId = req.params.id,
        participantId = req.params.pid;
    Event.findById(eventId, function(err, event){
        if (err) return handleError(res, err);
        event.updated = Date.now();
        event.participants.pull({ '_id' : participantId });
        event.save(function(err, event){
            req.event = event;
            next();
        })
    });
}


function handleError(res, err) {
    return res.status(500).send(err);
}